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1

Investigations of Electrical Trees in XLPE Cable Insulation Samples Using PC Based On-Line Monitoring  

Microsoft Academic Search

Using PC-based on-line monitoring system, extensive measurements were performed in insulation blocks cut from the XLPE insulation of 36, 69 and 132 kV rated cables produced in Saudi Arabia. A needle-plane electrode system was used with a needle radius of 10 mum. The role of 'applied stress step-time duration' and associated time resolved initiation and growth of different types of

A. A. Al-Arainy; M. I. Qureshi; N. H. Malik

2006-01-01

2

Characterization of XLPE cable insulation by dynamic mechanical thermal analyzer (DMTA)  

SciTech Connect

Polymeric insulated cables and accessories are becoming widely used at voltages over 120 kV, even up to 500 kV. Although high electrical stress presents the greatest challenge, some attention should be given to the fact that the polymeric insulation is also subjected to mechanical stress which can affect the electrical performance of the high-voltage cable system. Thus, the mechanical response to an ac stress induced by oscillating electrostatic forces could be an important factor with regard to long-term degradation of polymeric insulation. This paper presents preliminary mechanical relaxation measurements on XLPE and LDPE specimens taken from unaged transmission type cables. Dynamic mechanical relaxation showing radial profiles of the mechanical loss tangent and tensile modulus E{prime} are presented in a temperature range of 40 to 120 C.

Parpal, J.L.; Guddemi, C.; Lamarre, L.

1996-12-31

3

Aging of XLPE cable insulation under combined electrical and mechanical stresses  

SciTech Connect

Extruded crosslinked polyethylene (XLPE) insulation is widely used in high-voltage cables since it presents such attractive features as excellent dielectric properties and good thermomechanical behavior. However, its performance is affected by long-term degradation when it is subjected to the various thermal, mechanical and environmental stresses occurring in service in combination with electrical stress. The synergetic effect of superposed electrical and other stresses remains to be fully clarified. In particular, a fairly high level of mechanical stresses can be present in the insulation volume, originating from residual internal stresses created during the cooling process in the fabrication, external forces when cables are bent sharply, or thermomechanical stresses caused by differential thermal expansion between the conductor and the insulating material. In order to investigate the influence of the superposition of mechanical and electrical stresses, various measurements were conducted on XLPE and LDPE specimens in tip-plane and plane-plane geometries. Experimental data of time-to-breakdown, breakdown field and tree length are presented as a function of the magnitude of the stresses. In all cases, superposition of the mechanical stress was found to reduce the dielectric strength of the material.

David, E.; Parpal, J.L.; Crine, J.P. [Inst. de Recherche d`Hydro-Quebec, Varennes, Quebec (Canada)

1996-12-31

4

Water migration in degraded XLPE cables  

Microsoft Academic Search

During dielectric response measurements on samples of XLPE 22 kV cable that were known to have been severely-degraded in service by water trees, it was observed that the insulation of the cable appeared to degrade considerably after water-immersed cable sample were connected to the rated voltage AC supply. This paper describes results of systematic experiments made to investigate this factor

B. S. Oyegoke; D. Birtwhistle; J. Lyall; T. K. Saha

2006-01-01

5

Study on the frequency spectrums of acoustic emission PD signals in XLPE cable accessories  

Microsoft Academic Search

In this paper, four 110 kV prefabricated cable joints models containing four kinds of known representative insulation defects were designed. The models can simulate some typical PD phenomena, such as sliding discharge, floating discharge, cavity discharge and protrusion discharge. Based on them, type frequency spectrums of AE PD signals in XLPE cable joints were studied. The investigation indicated that the

Wei Wang; Xu Cheng; Chong Liu; Zhifu Yang; Heming Huang; Qiang Xue

2008-01-01

6

Laboratory tests on the role of impurities in semiconducting shield materials on the degradation of XLPE cable insulation  

Microsoft Academic Search

Analyses of field-aged and failed cables recovered from the field over the past fifteen years have contributed a great deal of information that has been compiled to gain a better understanding of failure mechanisms is direct buried (URD), medium voltage cables. The experience gained through these analyses strongly suggested that water and ions, acting with the applied electric field, were

J. H. Groeger; M. S. Mashikian; S. Dale

1989-01-01

7

Electron spin resonance spectral study of PVC and XLPE insulation materials and their life time analysis.  

PubMed

Electron spin resonance (ESR) study is carried out to characterize thermal endurance of insulating materials used in power cable industry. The presented work provides ESR investigation and evaluation of widely used cable insulation materials, namely polyvinyl chloride (PVC) and cross-linked polyethylene (XLPE). The results confirm the fact that PVC is rapidly degrades than XLPE. The study also indicates that colorants and cable's manufacturing processes enhance the thermal resistance of the PVC. It also verifies the powerfulness and the importance of the ESR-testing of insulation materials compared to other tests assumed by International Electrotechnical Commission (IEC) Standard 216-procedure, e.g. weight loss (WL), electric strength (ES) or tensile strength (TS). The estimated thermal endurance parameters by ESR-method show that the other standard methods overestimate these parameters and produce less accurate thermal life time curves of cable insulation materials. PMID:16024271

Morsy, M A; Shwehdi, M H

2006-03-01

8

Electron spin resonance spectral study of PVC and XLPE insulation materials and their life time analysis  

NASA Astrophysics Data System (ADS)

Electron spin resonance (ESR) study is carried out to characterize thermal endurance of insulating materials used in power cable industry. The presented work provides ESR investigation and evaluation of widely used cable insulation materials, namely polyvinyl chloride (PVC) and cross-linked polyethylene (XLPE). The results confirm the fact that PVC is rapidly degrades than XLPE. The study also indicates that colorants and cable's manufacturing processes enhance the thermal resistance of the PVC. It also verifies the powerfulness and the importance of the ESR-testing of insulation materials compared to other tests assumed by International Electrotechnical Commission (IEC) Standard 216-procedure, e.g. weight loss (WL), electric strength (ES) or tensile strength (TS). The estimated thermal endurance parameters by ESR-method show that the other standard methods overestimate these parameters and produce less accurate thermal life time curves of cable insulation materials.

Morsy, M. A.; Shwehdi, M. H.

2006-03-01

9

Improvement of impulse breakdown strength of an XLPE cable by modifing semiconducting layer  

NASA Astrophysics Data System (ADS)

A technique was investigated which reduces insulation thickness by improving breakdown strength of XLPE (cross-linked polyethylene) cables, using additives to improve interfaces of semiconducting layers, in order to restrain construction cost. Miniature model cables of 1mm insulation thick, 2mm diameter of inner semiconducting layer were manufactured. An additive was included in the semiconducting layer of each miniature cable to improve the interface with the insulating layer. The strength of dielectric breakdown was measured by testing of the impulsive pressure with lightning. The results of the impulse breakdown test show a rise in breakdown strength, indicating the effective function to make interface defects harmless. Based on the results of a previous report, a specific kind of additive which has an excellent function to improve both ac and impulse breakdown strength was selected. Additives used in this test are mainly nonionic surface active agents such as polyglyceric fatty acid esters.

Hozumi, N.; Okamoto, T.; Ishida, M.

1988-09-01

10

Analysis of the XLPE Insulation of Distribution Covered Conductors in Brazil  

NASA Astrophysics Data System (ADS)

Cross-linked polyethylene (XLPE) has been the most common insulation applied to medium voltage covered conductors (MVCCs) in Brazil. The results of accelerated aging tests carried out at high voltage laboratory of UNIFEI (LAT-EFEI), combining the stresses of heat and voltage to ground aiming at enhancing surface corona activity assays, have identified the early failures in XLPE insulations of the Brazilian MVCCs. The observed failures indicate that complementary studies should be performed to better understand the degradation mechanisms of the MVCCs insulations manufactured in Brazil. In this paper, x-ray photoelectron spectroscopy (XPS), contact angle analysis (CA), photoacoustic spectroscopy (PAS), x-ray diffraction (XRD), and atomic force microscopy (AFM) measurements on samples of five Brazilian national/regional MVCCs are reported. XPS, CA, and PAS analysis indicated that a large variety of oxygen-containing groups associated to the oxidation of the XLPE insulations appear to be related to the manufacturing conditions. AFM analysis indicated that the average surface roughness and topography of the XLPE insulation changed significantly and depend on the selected manufacturer. XRD analysis indicates a strong heterogeneity of crystals nucleation that results into different degrees of crystallinity of the Brazilian MVCCs cables. The results of this work indicate strong evidences of manufacturing defects in the XLPE insulation of Brazilian's MVCCs. The origin of these defects seems to be inherent to the technology used by manufacturers to the production of the MVCCs. The production-related defects are not detectable by the standard tests as partial discharges or even the standard routine—acceptance power frequency assays routinely used in dielectric compatibility tests at high voltage laboratories.

Nóbrega, A. M.; Martinez, M. L. B.; de Queiroz, Alvaro Antonio Alencar

2014-03-01

11

Influence of accelerated aging on mechanical and structural properties of cross-linked polyethylene (XLPE) insulation  

Microsoft Academic Search

Contents  ?This paper describes results of laboratory accelerated aging test and the influence of different aging conditions on non-electrical\\u000a properties of cross-linked polyethylene insulation (XLPE). Accelerated aging has been carried out on a cable model with different\\u000a electrical and thermal stresses, and with thermal stresses in air or water as surrounding environment. Tensile strength, elongation\\u000a at break, degree of cross linking

D. Andjelkovic; N. Rajakovic

2001-01-01

12

Approximation of transmission line parameters of single-core and three-core XLPE cables  

Microsoft Academic Search

A transmission line model of a power cable is required for the analysis of the behavior of high-frequency phenomena, such as partial discharges, lightning impulses and switching transients, in cables. A transmission line is characterized by its characteristic impedance, attenuation coefficient and propagation velocity. The semiconducting layers in an XLPE cable have a significant influence on these parameters. Unfortunately, the

P. Wagenaars; P. A. A. F. Wouters; P. C. J. M. Van Der Wielen; E. F. Steennis

2010-01-01

13

A new type of dry power transformer based on XLPE cable winding  

Microsoft Academic Search

This paper summarizes a new type of dry transformer, which is developed firstly by ABB, whose brand name is dry former. Dryformer is produced by combining modern high voltage XLPE cable technology with conventional transformer. The following conclusion can be derived from the analysis of construction features of the new type dry transformer: compared with the traditional transformer, it has

Gao Yingna; Wang Shishan; Gao Hong

2005-01-01

14

Development of 66kV XLPE submarine cable using optical fiber as a mechanical-damage-detection-sensor  

SciTech Connect

Submarine cables are exposed to great risk of serious mechanical damage by ship anchors or equipment used for fishing. Detection of such damage in a submarine cable is a very useful technology for improving the reliability of a submarine cable transmission line. A mechanical-damage-detection-sensor using optical fiber was developed. A prototype 66kV XLPE submarine cable incorporating the sensor was manufactured for trial, and the ability of a sensor was confirmed by compression test. Actual 66kV XLPE submarine cable incorporating the sensor was manufactured for trial, and the ability of a sensor was confirmed by compression test. Actual 66kV XLPE submarine cable with the sensor was manufactured and installed as an operating transmission line in Japan.

Nishimoto, Toshio; Miyahara, Tsutomu [Chugoku Electric Power Co., Ltd., Okayama (Japan)] [Chugoku Electric Power Co., Ltd., Okayama (Japan); Takehana, Hajime; Tateno, Fuminori [Fujikura Ltd., Tokyo (Japan)] [Fujikura Ltd., Tokyo (Japan)

1995-10-01

15

Electrical conduction of a XLPE nanocomposite  

NASA Astrophysics Data System (ADS)

The resistivity, breakdown strength, and formation of space charges are very important factors for insulation design of HVDC cable. It is known that a nano-sized metal-oxide inorganic filler reduces the formation of space charges in the polymer nanocomposite. Electrical conduction of cross-linked polyethylene(XLPE) nanocomposite insulating material is investigated in this paper. The conduction currents of two kinds of XLPE nanocomposites and XLPE without nano-filler were measured at temperature of 303 ~ 363 K under the applied electric fields of 10 ~ 50 kV/mm. The current of the nanocomposite specimen is smaller than that of XLPE specimen without nano-filler. The conduction mechanism may be explained in terms of Schottky emission and multi-core model.

Park, Yong-Jun; Sim, Jae-Yong; Lim, Kee-Joe; Nam, Jin-Ho; Park, Wan-Gi

2014-07-01

16

Fully synthetic taped insulation cables  

DOEpatents

A high voltage oil-impregnated electrical cable with fully polymer taped insulation operable to 765 kV. Biaxially oriented, specially processed, polyethylene, polybutene or polypropylene tape with an embossed pattern is wound in multiple layers over a conductive core with a permeable screen around the insulation. Conventional oil which closely matches the dielectric constant of the tape is used, and the cable can be impregnated after field installation because of its excellent impregnation characteristics.

Forsyth, Eric B. (Brookhaven, NY); Muller, Albert C. (Center Moriches, NY)

1984-01-01

17

Basic study of transient breakdown voltage in solid dielectric cables  

Microsoft Academic Search

A comprehensive review of the technical and scientific publications relating to crosslinked polyethylene (XLPE) and ethylene propylene rubber (EPR) insulated cables revealed that there is very little known with respect to the life expectancy, the final factory voltage test background and the mechanism of voltage breakdown of these cables. A new methodology for the investigation of breakdown voltages of XLPE

G. Bahder; M. Sosnowski; C. Katz

1980-01-01

18

6.6kV XLPE submarine cable with optical fiber sensors to detect anchor damage and defacement of wire armor  

SciTech Connect

The Kansai Electric Power Co., Inc. and Fujikura Ltd. have developed a 6.6kV XLPE submarine cable with optical fiber sensors to detect anchor damage and defacement of wire armor. The cable was installed between Kata and Tomogashima island in Wakayama prefecture, Japan. The ability to detect cable damage was confirmed by compression test, curved tensile test using CIGRE-recommended method, and loop tests. Also, in this power cable, the distributed optical fiber sensor was built-in to measure cable temperature. This report shows the results of these tests and the outline of the cable installation.

Tayama, Hirohumi; Fukuda, Osamu; Yamamoto, Kenichi [Kansai Electric Power Co., Inc., Osaka (Japan)] [Kansai Electric Power Co., Inc., Osaka (Japan); Inoue, Yosimasa; Koike, Yohji [Fujikura Ltd., Tokyo (Japan)] [Fujikura Ltd., Tokyo (Japan)

1995-10-01

19

Fully synthetic taped insulation cables  

DOEpatents

The present invention is a cable which, although constructed from inexpensive polyolefin tapes and using typical impregnating oils, furnishes high voltage capability up to 765 kV, and has such excellent dielectric characteristics and heat transfer properties that it is capable of operation at capacities equal to or higher than presently available cables at a given voltage. This is accomplished by using polyethylene, polybutene or polypropylene insulating tape which has been specially processed to attain properties which are not generally found in these materials, but are required for their use in impregnated electrical cables. Chief among these properties is compatibility with impregnating oil.

Forsyth, E.B.; Muller, A.C.

1983-07-15

20

Installation of 66kV XLPE power-optical fiber composite submarine cable and water pipe for the Trans-Tokyo Bay Highway  

SciTech Connect

The manufacturing and the installation of the optical fiber composite submarine cable and water pipe for the Trans-Tokyo Bay Highway were completed in 1993. It was the Japanese longest 66kV XLPE power-optical fiber composite submarine cable and the first application of optical fiber composite submarine water pipe composed of two hollow galvanized steel armor wires inserted with optical fiber to monitor and control of construction sites. This paper describes the application and development of the hollow steel armor wire with optical fiber ribbon and the features of construction and installation of the optical fiber composite submarine cable and water pipe.

Nakamura, Y.; Kuroshima, T.; Takeuchi, M. [Trans-Tokyo Bay Highway Co. (Japan)] [Trans-Tokyo Bay Highway Co. (Japan); Sanpei, T.; Suzuki, S.; Ishikura, S.; Inoue, H.; Uematsu, T. [Furukawa Electric Co., Ltd. (Japan)] [Furukawa Electric Co., Ltd. (Japan)

1995-07-01

21

Risk Assessment of XLPE Power Cables Based on Fuzzy Comprehensive Evaluation Method  

Microsoft Academic Search

With the large-scale application of power cables in the urban power grid, the performance of power cables has a direct effect on the reliability of supply. Therefore, the risk assessment of power cables, which is an important act to improve power supply reliability and reduce economic loss, is vigorously carried out in power enterprises. The risk of power cables is

Jia-jia Huan; Gang Wang; Hai-feng Li; Zhi-bin Sun

2010-01-01

22

Fuzzy comprehensive evaluation for insulation diagnosis of high voltage cable  

Microsoft Academic Search

The insulation characteristics parameters of high voltage cable are analyzed. Fuzzy comprehensive evaluation is introduced into multiparameter diagnosis of cable insulation. The fuzzy comprehensive evaluation model is established, and the grade of membership of insulation state is judged from multiple indicators. Consulting previous division standard of insulation state, the threshold of membership function is determined by relative variation of insulation

Jiantao Sun; Guangfan Li; Keli Gao; Bo Li; Jinzhong Li; Lei Lan

2010-01-01

23

Development of radiation resistant electrical cable insulations  

NASA Technical Reports Server (NTRS)

Two new polyethylene cable insulations have been formulated for nuclear applications and have been tested under gamma radiation. Both insulations are based on low density polyethylene, one with PbO and the other with Sb2O3 as additives. The test results show that the concept of using inorganic antioxidants to retard radiation initiated oxidation (RIO) is viable. PbO is more effective than Sb2O3 in minimizing RIO.

Lee, B. S.; Soo, P.; Mackenzie, D. R.

1994-01-01

24

Development of radiation resistant electrical cable insulations  

SciTech Connect

Two new polyethylene cable insulations have been formulated for nuclear applications, and have been tested under gamma radiation. Both insulations are based on low density polyethylene, one with PbO and the other with Sb{sub 2}O{sub 3} as additives. The test results show that the concept of using inorganic antioxidants to retard radiation initiated oxidation (RIO) is viable. PbO is more effective than Sb{sub 2}O{sub 3} in minimizing RIO.

Lee, B.S.; Soo, P.; MacKenzie, D.R.

1993-12-31

25

46 CFR 111.60-21 - Cable insulation tests.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 2012-10-01 false Cable insulation tests. 111.60-21 Section 111...and Methods § 111.60-21 Cable insulation tests. All cable for electric power...equipment must be checked for proper insulation resistance to ground and between...

2012-10-01

26

46 CFR 111.60-21 - Cable insulation tests.  

...2014-10-01 2014-10-01 false Cable insulation tests. 111.60-21 Section 111...and Methods § 111.60-21 Cable insulation tests. All cable for electric power...equipment must be checked for proper insulation resistance to ground and between...

2014-10-01

27

46 CFR 111.60-21 - Cable insulation tests.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 false Cable insulation tests. 111.60-21 Section 111...and Methods § 111.60-21 Cable insulation tests. All cable for electric power...equipment must be checked for proper insulation resistance to ground and between...

2013-10-01

28

Mineral insulated cables for post accident service  

SciTech Connect

The regulatory requirement to measure the gamma radiation levels during accident conditions inside a reactor containment building is discussed. The development of a mineral-insulated cable and connector system to accurately transmit this measurement is described and a model of the response is developed.

McMillin, P.L.; Winkler, M.E.

1986-02-01

29

IEEE Transactions on Dielectrics and Electrical Insulation Vol. 19, No. 1; February 2012 321 1070-9878/12/$25.00 2012 IEEE  

E-print Network

IEEE Transactions on Dielectrics and Electrical Insulation Vol. 19, No. 1; February 2012 321 1070-XLPE) that is relevant to water tree development in underground cable insulation. Finite element calculations were used to estimate the stresses developed in cable insulation by di-electrophoretic forces; these stresses

Ritchie, Robert

30

Insulation life tests of multiple insulated wire cables in presence of high frequency and high temperature  

Microsoft Academic Search

The behaviour of insulated copper wire windings in the presence of power ac voltage and relatively high temperatures from the point of view of the insulation life is reasonably well known. However, the introduction of both modern multiple insulated wire cables and high frequency PWM-like supply voltages can give rise to a lower insulation life than in the previous case.

B. Cerutti; G. Coletti; F. Guastavino; C. Gemme

2000-01-01

31

30 CFR 75.516-2 - Communication wires and cables; installation; insulation; support.  

Code of Federal Regulations, 2010 CFR

...Communication wires and cables; installation; insulation; support. 75.516-2 Section...Communication wires and cables; installation; insulation; support. (a) All communication...and trolley feeder wires. Additional insulation shall be provided for...

2010-07-01

32

30 CFR 75.516-2 - Communication wires and cables; installation; insulation; support.  

Code of Federal Regulations, 2013 CFR

...Communication wires and cables; installation; insulation; support. 75.516-2 Section...Communication wires and cables; installation; insulation; support. (a) All communication...and trolley feeder wires. Additional insulation shall be provided for...

2013-07-01

33

30 CFR 75.516-2 - Communication wires and cables; installation; insulation; support.  

Code of Federal Regulations, 2011 CFR

...Communication wires and cables; installation; insulation; support. 75.516-2 Section...Communication wires and cables; installation; insulation; support. (a) All communication...and trolley feeder wires. Additional insulation shall be provided for...

2011-07-01

34

30 CFR 75.516-2 - Communication wires and cables; installation; insulation; support.  

...Communication wires and cables; installation; insulation; support. 75.516-2 Section...Communication wires and cables; installation; insulation; support. (a) All communication...and trolley feeder wires. Additional insulation shall be provided for...

2014-07-01

35

30 CFR 75.516-2 - Communication wires and cables; installation; insulation; support.  

Code of Federal Regulations, 2012 CFR

...Communication wires and cables; installation; insulation; support. 75.516-2 Section...Communication wires and cables; installation; insulation; support. (a) All communication...and trolley feeder wires. Additional insulation shall be provided for...

2012-07-01

36

DC conduction and breakdown characteristics of Al2O3/cross-linked polyethylene nanocomposites for high voltage direct current transmission cable insulation  

NASA Astrophysics Data System (ADS)

We have discussed a cross-linked polyethylene (XLPE) nanocomposite insulating material that is able to DC voltage applications. Nanocomposites, which are composed in polymer matrix mixed with nano-fillers, have received considerable attention because of their potential benefits as dielectrics. The nano-sized alumina oxide (Al2O3)/XLPE nanocomposite was prepared, and three kinds of test, such as DC breakdown, DC polarity reversal breakdown, and volume resistivity were performed. By the addition of nano-sized Al2O3 filler, both the DC breakdown strength and the volume resistivity of XLPE were increased. A little homogeneous space charge was observed in Al2O3/XLPE nanocomposite material in the vicinity of electrode through the polarity reversal breakdown test. From these results, it is thought that the addition of Al2O3 nano-filler is effective for the improvement of DC electrical insulating properties of XLPE.

Park, Yong-Jun; Kwon, Jung-Hun; Sim, Jae-Yong; Hwang, Ju-Na; Seo, Cheong-Won; Kim, Ji-Ho; Lim, Kee-Joe

2014-08-01

37

30 CFR 56.12008 - Insulation and fittings for power wires and cables.  

Code of Federal Regulations, 2010 CFR

...DEPARTMENT OF LABOR METAL AND NONMETAL MINE SAFETY AND HEALTH SAFETY AND HEALTH STANDARDS-SURFACE METAL AND NONMETAL MINES Electricity § 56.12008 Insulation and fittings for power wires and cables. Power wires and cables shall be insulated...

2010-07-01

38

30 CFR 56.12008 - Insulation and fittings for power wires and cables.  

...DEPARTMENT OF LABOR METAL AND NONMETAL MINE SAFETY AND HEALTH SAFETY AND HEALTH STANDARDS-SURFACE METAL AND NONMETAL MINES Electricity § 56.12008 Insulation and fittings for power wires and cables. Power wires and cables shall be insulated...

2014-07-01

39

30 CFR 56.12008 - Insulation and fittings for power wires and cables.  

Code of Federal Regulations, 2011 CFR

...DEPARTMENT OF LABOR METAL AND NONMETAL MINE SAFETY AND HEALTH SAFETY AND HEALTH STANDARDS-SURFACE METAL AND NONMETAL MINES Electricity § 56.12008 Insulation and fittings for power wires and cables. Power wires and cables shall be insulated...

2011-07-01

40

30 CFR 56.12008 - Insulation and fittings for power wires and cables.  

Code of Federal Regulations, 2012 CFR

...DEPARTMENT OF LABOR METAL AND NONMETAL MINE SAFETY AND HEALTH SAFETY AND HEALTH STANDARDS-SURFACE METAL AND NONMETAL MINES Electricity § 56.12008 Insulation and fittings for power wires and cables. Power wires and cables shall be insulated...

2012-07-01

41

He II heat transfer through superconducting cables electrical insulation  

NASA Astrophysics Data System (ADS)

For NbTi magnets cooled by superfluid helium (He II), the most severe heat barrier comes from the electrical insulation of the cables. Tests on electrical multi-layer insulations, made of Kapton ®, dry fiber and epoxy resin impregnated fiberglass tapes, indicate that heat transfer is influenced by He II contained in the insulation. Electrical insulation can be considered as a composite material made of a solid matrix with a complicated helium channels network. For several insulations, this network is characterized by steady-state heat transfer experiment through an elementary insulation pattern. Measurements in Landau regime for low temperature difference (10 -5-10 -3 K) and in Gorter-Mellink (GM) regime for higher temperature differences permit to determine an equivalent He II channel cross-section (10 -6 m 2) with an equivalent channel thickness (25 ?m). We use the assumptions that He II heat transfer through the channels network and conduction in the insulation are decoupled and that the channels length is determined from the insulation overlap. It is observed that He II heat transfer is competing with conduction in the insulation. Furthermore, the measurements reveal an anomaly of heat transfer in the vicinity of the ? temperature which is associated to the phenomenon of ?-point depression.

Baudouy, B.; François, M. X.; Juster, F.-P.; Meuris, C.

2000-02-01

42

49 CFR 236.108 - Insulation resistance tests, wires in trunking and cables.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 2012-10-01 false Insulation resistance tests, wires in trunking...Tests; All Systems § 236.108 Insulation resistance tests, wires in trunking and cables. (a) Insulation resistance of wires and...

2012-10-01

43

49 CFR 236.108 - Insulation resistance tests, wires in trunking and cables.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 false Insulation resistance tests, wires in trunking...Tests; All Systems § 236.108 Insulation resistance tests, wires in trunking and cables. (a) Insulation resistance of wires and...

2013-10-01

44

49 CFR 234.267 - Insulation resistance tests, wires in trunking and cables.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 2012-10-01 false Insulation resistance tests, wires in trunking...Inspections and Tests § 234.267 Insulation resistance tests, wires in trunking and cables. (a) Insulation resistance tests shall be made...

2012-10-01

45

49 CFR 234.267 - Insulation resistance tests, wires in trunking and cables.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 2011-10-01 false Insulation resistance tests, wires in trunking...Inspections and Tests § 234.267 Insulation resistance tests, wires in trunking and cables. (a) Insulation resistance tests shall be made...

2011-10-01

46

49 CFR 236.108 - Insulation resistance tests, wires in trunking and cables.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 2011-10-01 false Insulation resistance tests, wires in trunking...Tests; All Systems § 236.108 Insulation resistance tests, wires in trunking and cables. (a) Insulation resistance of wires and...

2011-10-01

47

49 CFR 234.267 - Insulation resistance tests, wires in trunking and cables.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 false Insulation resistance tests, wires in trunking...Inspections and Tests § 234.267 Insulation resistance tests, wires in trunking and cables. (a) Insulation resistance tests shall be made...

2013-10-01

48

Cost-Effective Cable Insulation: Nanoclay Reinforced Ethylene-Propylene-Rubber for Low-Cost HVDC Cabling  

SciTech Connect

GENI Project: GE is developing new, low-cost insulation for high-voltage direct current (HVDC) electricity transmission cables. The current material used to insulate HVDC transmission cables is very expensive and can account for as much as 1/3 of the total cost of a high-voltage transmission system. GE is embedding nanomaterials into specialty rubber to create its insulation. Not only are these materials less expensive than those used in conventional HVDC insulation, but also they will help suppress excess charge accumulation. The excess charge left behind on a cable poses a major challenge for high-voltage insulation—if it’s not kept to a low level, it could ultimately lead the insulation to fail. GE’s low-cost insulation is compatible with existing U.S. cable manufacturing processes, further enhancing its cost effectiveness.

None

2012-02-24

49

Aging and condition monitoring studies of composite insulation cables used in nuclear power plants  

Microsoft Academic Search

Five composite ethylene propylene rubber\\/chlorosulfonated polyethylene (EPR\\/CSPE) insulated cables, a single composite cable with EPR\\/Neoprene, and a single Kerite insulated cable used in US nuclear power plants (NPP's) were evaluated. All of the cables had a CSPE outer jacket. To study the rate of degradation these cables were thermally aged at 110 and 120 degC until embrittlement of the composite

K. Anandakumaran

2007-01-01

50

Optimization of electron beam crosslinking of wire and cable insulation  

NASA Astrophysics Data System (ADS)

The computer simulations based on Monte Carlo (MC) method and the ModeCEB software were carried out in connection with electron beam (EB) radiation set-up for crosslinking of electric wire and cable insulation. The theoretical predictions for absorbed dose distribution in irradiated electric insulation induced by scanned EB were compared to the experimental results of irradiation that was carried out in the experimental set-up based on ILU 6 electron accelerator with electron energy 0.5-2.0 MeV. The computer simulation of the dose distributions in two-sided irradiation system by a scanned electron beam in multilayer circular objects was performed for various process parameters, namely electric wire and cable geometry (thickness of insulation layers and copper wire diameter), type of polymer insulation, electron energy, energy spread and geometry of electron beam, electric wire and cable layout in irradiation zone. The geometry of electron beam distribution in the irradiation zone was measured using CTA and PVC foil dosimeters for available electron energy range. The temperature rise of the irradiated electric wire and irradiation homogeneity were evaluated for different experimental conditions to optimize technological process parameters. The results of computer simulation are consistent with the experimental data of dose distribution evaluated by gel-fraction measurements. Such conformity indicates that ModeCEB computer simulation is reliable and sufficient for optimization absorbed dose distribution in the multi-layer circular objects irradiated with scanned electron beams.

Zimek, Zbigniew; Przybytniak, Gra?yna; Nowicki, Andrzej

2012-09-01

51

New developments in the field of high voltage and extra-high voltage cables  

SciTech Connect

In this paper, the author presents the developments in progress at the present time in France concerning the high voltage (HV) and extra-high voltage (EHV) cables with synthetic insulation and their accessories up to the 500 kV range. The authors have adopted a maximum operating field strength approaching 16 kV/mm (405 V/mil) for low density polyethylene (LDPE) insulated cables. The on-going studies should allow to bring the maximum operating field strength for crosslinked polyethylene (XLPE) insulation from 7 to 10 kV/mm (180 to 255 V/mil) and cables could be manufactured more economically with this material.

Jocteur, R. (Societe Industrielle de Liaisons Electriques, 77130 Montereau (FR))

1990-04-01

52

30 CFR 75.517-1 - Power wires and cables; insulation and protection.  

Code of Federal Regulations, 2012 CFR

...2012-07-01 false Power wires and cables; insulation and protection. 75.517-1 Section...517-1 Power wires and cables; insulation and protection. Power wires and...or after March 30, 1970, shall have insulation with a dielectric strength at least...

2012-07-01

53

30 CFR 75.517-1 - Power wires and cables; insulation and protection.  

Code of Federal Regulations, 2011 CFR

...2011-07-01 false Power wires and cables; insulation and protection. 75.517-1 Section...517-1 Power wires and cables; insulation and protection. Power wires and...or after March 30, 1970, shall have insulation with a dielectric strength at least...

2011-07-01

54

30 CFR 75.517-1 - Power wires and cables; insulation and protection.  

...2014-07-01 false Power wires and cables; insulation and protection. 75.517-1 Section...517-1 Power wires and cables; insulation and protection. Power wires and...or after March 30, 1970, shall have insulation with a dielectric strength at least...

2014-07-01

55

30 CFR 75.517-1 - Power wires and cables; insulation and protection.  

Code of Federal Regulations, 2013 CFR

...2013-07-01 false Power wires and cables; insulation and protection. 75.517-1 Section...517-1 Power wires and cables; insulation and protection. Power wires and...or after March 30, 1970, shall have insulation with a dielectric strength at least...

2013-07-01

56

30 CFR 75.517-1 - Power wires and cables; insulation and protection.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 false Power wires and cables; insulation and protection. 75.517-1 Section...517-1 Power wires and cables; insulation and protection. Power wires and...or after March 30, 1970, shall have insulation with a dielectric strength at least...

2010-07-01

57

30 CFR 75.818 - Use of insulated cable handling equipment.  

Code of Federal Regulations, 2010 CFR

...STANDARDS-UNDERGROUND COAL MINES Underground High-Voltage Distribution High-Voltage Longwalls § 75.818 Use of insulated cable handling equipment. (a) Energized high-voltage cables must not be handled except when...

2010-07-01

58

Research on the Insulation Design of a 154 kV Class HTS Power Cable and Termination  

Microsoft Academic Search

A 154 kV class high-temperature superconducting (HTS) power cable system Is developing in Korea. For insulation design of this cable, the grading method of insulating paper is proposed. The electrical insulation material has been used two kind of laminated polypropylene paper (LPP) that has different thickness. The use of graded insulation gives improved mechanical bending properties of the cable. Also,

D. S. Kwag; H. G. Cheon; J. H. Choi; H. J. Kim; J. W. Cho; S. H. Kim

2007-01-01

59

Studies on electrical cable insulation for nuclear applications  

SciTech Connect

Two new polyethylene cable insulations have been formulated for nuclear applications, and have been tested under gamma radiation. Both insulations are based on low density polyethylene, one with PbO and the other with Sb{sub 2}O{sub 3} as additives. The test results show that the concept of using inorganic anti-oxidants to retard radiation initiated oxidation is viable, and PbO is more effective than Sb{sub 2}O{sub 3} in slowing down radiation initiated oxidation (RIO). Also, radiation degradation data for polyethylene and polyvinyl chloride at 60{degrees}C have been generated, which will be used to understand radiation initiated oxidation process on these materials combined with the 25{degrees}C data that will be generated in the future. 14 refs., 41 figs., 3 tabs.

Lee, B.S.; Soo, P.; MacKenzie, D.R. [Brookhaven National Lab., Upton, NY (USA); Blackburn, P. [Beloit Junior-Senior High School, KS (USA)

1989-12-01

60

30 CFR 75.517 - Power wires and cables; insulation and protection.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 2010-07-01 false Power wires and cables; insulation and protection. 75.517 Section 75.517 Mineral Resources...Equipment-General § 75.517 Power wires and cables; insulation and protection. [Statutory Provisions] Power...

2010-07-01

61

30 CFR 75.517 - Power wires and cables; insulation and protection.  

...2014-07-01 2014-07-01 false Power wires and cables; insulation and protection. 75.517 Section 75.517 Mineral Resources...Equipment-General § 75.517 Power wires and cables; insulation and protection. [Statutory Provisions] Power...

2014-07-01

62

30 CFR 75.517 - Power wires and cables; insulation and protection.  

Code of Federal Regulations, 2013 CFR

...2013-07-01 2013-07-01 false Power wires and cables; insulation and protection. 75.517 Section 75.517 Mineral Resources...Equipment-General § 75.517 Power wires and cables; insulation and protection. [Statutory Provisions] Power...

2013-07-01

63

30 CFR 57.12008 - Insulation and fittings for power wires and cables.  

Code of Federal Regulations, 2011 CFR

...Resources 1 2011-07-01 2011-07-01 false Insulation and fittings for power wires and cables. 57.12008 Section...MINES Electricity Surface and Underground § 57.12008 Insulation and fittings for power wires and cables. Power wires...

2011-07-01

64

30 CFR 75.517 - Power wires and cables; insulation and protection.  

Code of Federal Regulations, 2011 CFR

...2011-07-01 2011-07-01 false Power wires and cables; insulation and protection. 75.517 Section 75.517 Mineral Resources...Equipment-General § 75.517 Power wires and cables; insulation and protection. [Statutory Provisions] Power...

2011-07-01

65

30 CFR 75.517 - Power wires and cables; insulation and protection.  

Code of Federal Regulations, 2012 CFR

...2012-07-01 2012-07-01 false Power wires and cables; insulation and protection. 75.517 Section 75.517 Mineral Resources...Equipment-General § 75.517 Power wires and cables; insulation and protection. [Statutory Provisions] Power...

2012-07-01

66

30 CFR 57.12008 - Insulation and fittings for power wires and cables.  

Code of Federal Regulations, 2013 CFR

...Resources 1 2013-07-01 2013-07-01 false Insulation and fittings for power wires and cables. 57.12008 Section...MINES Electricity Surface and Underground § 57.12008 Insulation and fittings for power wires and cables. Power wires...

2013-07-01

67

30 CFR 57.12008 - Insulation and fittings for power wires and cables.  

Code of Federal Regulations, 2010 CFR

...Resources 1 2010-07-01 2010-07-01 false Insulation and fittings for power wires and cables. 57.12008 Section...MINES Electricity Surface and Underground § 57.12008 Insulation and fittings for power wires and cables. Power wires...

2010-07-01

68

30 CFR 56.12008 - Insulation and fittings for power wires and cables.  

Code of Federal Regulations, 2013 CFR

...Resources 1 2013-07-01 2013-07-01 false Insulation and fittings for power wires and cables. 56.12008 Section...STANDARDS-SURFACE METAL AND NONMETAL MINES Electricity § 56.12008 Insulation and fittings for power wires and cables. Power wires...

2013-07-01

69

Dielectrometry measurements of moisture diffusion and temperature dynamics in oil impregnated paper insulated electric power cables  

E-print Network

Paper insulated lead covered (PILC) cables have played an important role in underground power distribution for a hundred years. Replacing aged PILC before failure is critical to managing power distribution. Three prominent ...

Thomas, Zachary M. (Zachary Michael)

2007-01-01

70

Thermally Enhanced Cable Insulation for the Nb-Ti High Luminosity LHC Inner Triplet Model  

E-print Network

A new concept of polyimide electrical insulation for superconducting cables of accelerator magnets was developed in the last years. Its enhanced He II permeability allows a significant improvement of the heat extraction from the coil. This cable insulation concept is used for the quadrupole magnet prototype for the insertion region of the High Luminosity - Large Hadron Collider project. It aims at pushing the limits of the Nb Ti technology to withstand high heat deposition. Cable samples wrapped with the new insulation scheme were characterized from the thermal standpoint, as well as from the electrical and mechanical ones. In particular, heat transfer measurements from insulated cables towards the helium cooling bath were performed in a coil-like configuration. Various wrapping schemes were tested in different mechanical conditions, and a model was developed to explain the experimental results. The paper summarizes the main results of all these investigations.

Granieri, P P; Richter, D; Tommasini, D

2012-01-01

71

30 CFR 57.12008 - Insulation and fittings for power wires and cables.  

...LABOR METAL AND NONMETAL MINE SAFETY AND HEALTH SAFETY AND HEALTH STANDARDS-UNDERGROUND METAL AND NONMETAL MINES Electricity Surface and Underground § 57.12008 Insulation and fittings for power wires and cables. Power wires and...

2014-07-01

72

30 CFR 57.12008 - Insulation and fittings for power wires and cables.  

Code of Federal Regulations, 2012 CFR

...LABOR METAL AND NONMETAL MINE SAFETY AND HEALTH SAFETY AND HEALTH STANDARDS-UNDERGROUND METAL AND NONMETAL MINES Electricity Surface and Underground § 57.12008 Insulation and fittings for power wires and cables. Power wires and...

2012-07-01

73

Evidence of strong correlation between space-charge buildup and breakdown in cable insulation  

Microsoft Academic Search

Many processes have been considered over the years to explain the origin of breakdown in cable insulation. Such effects as space charge build-up, tree growth, charge injection, etc. have all been discussed. Various techniques are now available to measure, in a nondestructive way, space charge distributions in insulators. These techniques, for instance the pressure wave propagation (PWP) method, can be

Yewen Zhang; Jacques Lewiner; Claude Alquie; Nigel Hampton

1996-01-01

74

Concept for thermal insulation arrangement within a flexible cryostat for HTS power cables  

Microsoft Academic Search

The successful application of high temperature superconducting power cables requires improved flexible cryostats with respect to their thermal heat load between environment (300 K) and LN2 (77 K) operating temperature. Heat transfer through the thermal insulation consists of thermal radiation, solid and residual gas conduction. Considering this heat load contributions, a new concept for the thermal insulation arrangement is presented

H. Neumann

2004-01-01

75

ASSESSMENT OF CABLE AGING USING CONDITION MONITORING TECHNIQUES  

SciTech Connect

Electric cables in nuclear power plants suffer degradation during service as a result of the thermal and radiation environments in which they are installed. Instrumentation and control cables are one type of cable that provide an important role in reactor safety. Should the polymeric cable insulation material become embrittled and cracked during service, or during a loss-of-coolant-accident (LOCA) and when steam and high radiation conditions are anticipated, failure could occur and prevent the cables from fulfilling their intended safety function(s). A research program is being conducted at Brookhaven National Laboratory to evaluate condition monitoring (CM) techniques for estimating the amount of cable degradation experienced during in-plant service. The objectives of this program are to assess the ability of the cables to perform under a simulated LOCA without losing their ability to function effectively, and to identify CM techniques which may be used to determine the effective lifetime of cables. The cable insulation materials tested include ethylene propylene rubber (EPR) and cross-linked polyethylene (XLPE). Accelerated aging (thermal and radiation) to the equivalent of 40 years of service was performed, followed by exposure to simulated LOCA conditions. The effectiveness of chemical, electrical, and mechanical condition monitoring techniques are being evaluated. Results indicate that several of these methods can detect changes in material parameters with increasing age. However, each has its limitations, and a combination of methods may provide an effective means for trending cable degradation in order to assess the remaining life of cables.

GROVE,E.; LOFARO,R.; SOO,P.; VILLARAN,M.; HSU,F.

2000-04-06

76

A polytetrafluorethylene insulated cable for high temperature oxygen aerospace applications  

NASA Technical Reports Server (NTRS)

For electrical cables to function and survive in the severe high temperature oxygen environment that will be experienced in the external tanks of the space shuttle, extreme cleanliness and material purity is required. A flexible light weight cable has been developed for use in pure oxygen at worst case temperatures of -190 to +260 degrees Centigrade and pressures as high as 44 pounds per square inch absolute. A comprehensive series of tests were performed on cables manufactured to the best commercial practices in order to establish the basic guidelines for control of build configuration as well as each material used in construction of the cable.

Sheppard, A. T.; Webber, R. G.

1983-01-01

77

Design of a cascaded H-bridge converter for insulation testing  

Microsoft Academic Search

This paper describes a design of a cascaded H-bridge converter for insulation testing of the crosslinked polyethylene (XLPE) cable. This high voltage generator produces a sinusoidal waveform at a very low frequency (VLF) of 0.1 Hz. The design of the cascaded H-bridge converter consists of two main parts, a modulation unit and a switching unit. The modulation unit compares the

W. Kongnun; A. Sangswang; S. Chotigo

2009-01-01

78

A Sol-Gel Approach to the Insulation of Rutherford Cables  

NASA Astrophysics Data System (ADS)

Two wind-and-react compatible variants for the electrical insulation of Rutherford cables by a sol-gel route have been investigated. The first variant involves the direct application of a sol-gel coating of SnO2-ZrO2 to the surface of the strands in the cable, whereas the second is an indirect approach consisting of coating stainless steel tapes with MgO-ZrO2 that are to be wrapped around or co-wound with the cable. Following the application of the insulation by one of the two methods, the insulation electrical resistance and breakdown voltage were determined for samples consisting of two 7 inches long cables pressed together and vacuum impregnated with epoxy (CTD-101K). With a notable exception, the breakdown voltages on directly insulated cables were too low for practical purposes. Better results, with breakdown voltages ranging from 20 to almost 200 V, were obtained for insulator coatings applied to stainless steel tapes. An additional sintering at 700-800°C for 6-12h of the coatings deposited on stainless steel was found to increase the breakdown voltage.

Buta, F.; Hascicek, Y. S.; Sumption, M. D.; Arda, L.; Aslanoglu, Z.; Akin, Y.; Collings, E. W.

2004-06-01

79

Partial Discharge Characteristics in Composite Insulation Systems with PPLP for HTS Cable  

NASA Astrophysics Data System (ADS)

The electrical insulation system of high-temperature superconducting (HTS) cable consists of liquid nitrogen (N2(l)) and polypropylene laminated paper (PPLP). Partial discharge (PD) may occur in butt gaps of the insulation layers and its characteristics imply the insulation performance of HTS cables. N2(l) cooling system is installed in the power system and N2(l) will flow through the cables during the system operation. Filling the HTS cable with N2(l) in order to perform pre-shipment inspection is time-consuming and costly for cable manufacturers. Therefore, they are trying to find a cost effective method for pre-shipment inspections. One alternative is to use high pressure gaseous nitrogen (N2(g)) instead of N2(l). This article investigates PD characteristics such as PD inception electric field (PDIE) and PD extinction electric field (PDEE) in butt gaps of HTS cables in 0.1 to 0.3 MPa and 0.1 MPa to 1.0 MPa N2(g) environments. For assessing the surface/volume effects, PD characteristics are measured with changing the size of butt gaps. It turns out that PDIE and PDEE in N2(g) are linearly correlated with those in N2(l) at any gas pressure in our testing, and PDIE in 1.0 MPa N2(g) is almost 30% of that in 0.2 MPa It suggests that PD characteristics in N2(l) can be extrapolated from those in N2(g).

Kikuchi, Y.; Yamashita, K.; Kumada, A.; Hidaka, K.; Tatamidani, K.; Masuda, T.

2014-05-01

80

Development of 500 kV DC PPLP-insulated oil-filled submarine cable  

SciTech Connect

This paper outlines the development of a 500 kV DC oil-filled submarine cable capable of transmitting 2,800 MW with {+-} 500 kV 2800A bipole system. Polypropylene Laminated Paper (PPL) was employed as the insulation material, which is the worlds first application to DC cables. The conductor size is 3,000 mm{sup 2}, which is the largest size for submarine cables ever put into practical use. Through various fundamental and prototype tests, the cable proved to have excellent electrical characteristics for DC voltage as well as transient overvoltage. The cable and accessories are currently undergoing a long-term accelerated aging test as the final confirmation of their reliability and stability.

Fujimori, A. [Kansai Electric Power Co., Inc., Osaka (Japan)] [Kansai Electric Power Co., Inc., Osaka (Japan); Tanaka, T. [Electric Power Development Co., Ltd., Tokyo (Japan)] [Electric Power Development Co., Ltd., Tokyo (Japan); Takashima, H. [Shikoku Electric Power Co., Inc., Kagawa (Japan)] [Shikoku Electric Power Co., Inc., Kagawa (Japan); Imajo, T. [Central Research Inst. of Electric Power Industry, Tokyo (Japan)] [Central Research Inst. of Electric Power Industry, Tokyo (Japan); Hata, R. [Sumitomo Electric Industries, Ltd., Osaka (Japan)] [Sumitomo Electric Industries, Ltd., Osaka (Japan); Tanabe, T. [Furukawa Electric Co., Ltd., Tokyo (Japan)] [Furukawa Electric Co., Ltd., Tokyo (Japan); Yoshida, S. [Fujikura, Ltd., Tokyo (Japan)] [Fujikura, Ltd., Tokyo (Japan); Kakihana, T. [Hitachi Cable, Ltd., Tokyo (Japan)] [Hitachi Cable, Ltd., Tokyo (Japan)

1996-01-01

81

On the use of doped polyethylene as an insulating material for HVDC cables  

SciTech Connect

The merits of HVDC cables with polymeric insulation are well recognized. However, the development of such cables is still hampered due to the problems resulting from the complicated dependence of the electrical conductivity of the polymer on the temperature and the dc electric field and the effects of space charge accumulation in this material. Different methods have been suggested to solve these problems yet none of these methods seem to give a conclusive solution. The present report provides, firstly a critical review of the previous works reported in the literature concerning the development of HVDC cables with polymeric insulation. Different aspects of those works are examined and discussed. Secondly, an account is given on an investigation using low density polyethylene (LDPE) doped with an inorganic additive as a candidate insulating material for HVDC cables. Preliminary results from measurements of dc breakdown strength and insulation resistivity of both the undoped and the doped materials are presented. It is shown that the incorporation of an inorganic additive into LDPE has improved the performance of the doped material under polarity reversal dc conditions at room temperature. Moreover, the dependency of the insulation resistivity on temperature for the doped material appears to be beneficially modified.

Khalil, M.S. [Sultan Qaboos Univ., Muscat (Oman)

1996-12-31

82

Neutron irradiation and temperature effects on induced voltages in various mineral insulated cables and ceramic-coated wires  

Microsoft Academic Search

U-shaped single copper and stainless steel core mineral insulated cables (with outer diameter 1.0 and 1.5mm), dual core mineral insulated cables (also with copper and stainless steel cores) and three types of ceramic-coated wires have been irradiated in the BR2 research reactor up to a maximum thermal neutron fluence of 1020n\\/cm2. The cables were guided through a 25cm long double

Ludo Vermeeren

2011-01-01

83

A new application area for fullerenes: voltage stabilizers for power cable insulation.  

PubMed

Fullerenes are shown to be efficient voltage-stabilizers for polyethylene, i.e., additives that increase the dielectric strength of the insulation material. Such compounds are highly sought-after because their use in power-cable insulation may considerably enhance the transmission efficiency of tomorrow's power grids. On a molal basis, fullerenes are the most efficient voltage stabilizers reported to date. PMID:25504254

Jarvid, Markus; Johansson, Anette; Kroon, Renee; Bjuggren, Jonas M; Wutzel, Harald; Englund, Villgot; Gubanski, Stanislaw; Andersson, Mats R; Müller, Christian

2015-02-01

84

"Flexible aerogel as a superior thermal insulation for high temperature superconductor cable applications"  

SciTech Connect

High temperature superconducting (HTS) cables are an advanced technology that can both strengthen and improve the national electrical distribution infrastructure. HTS cables require sufficient cooling to overcome inherent low temperature heat loading. Heat loads are minimized by the use of cryogenic envelopes or cryostats. Cryostats require improvement in efficiency, reliability, and cost reduction to meet the demanding needs of HTS conductors (1G and 2G wires). Aspen Aerogels has developed a compression resistant aerogel thermal insulation package to replace compression sensitive multi-layer insulation (MLI), the incumbent thermal insulation, in flexible cryostats for HTS cables. Oak Ridge National Laboratory tested a prototype aerogel package in a lab-scale pipe apparatus to measure the rate of heat invasion. The lab-scale pipe test results of the aerogel solution will be presented and directly compared to MLI. A compatibility assessment of the aerogel material with HTS system components will also be presented. The aerogel thermal insulation solution presented will meet the demanding needs of HTS cables.

White, Shannon O. [Aspen Aerogel, Inc.; Demko, Jonathan A [ORNL; Tomich, A. [Aspen Aerogel, Inc.

2010-01-01

85

Flexible Aerogel as a Superior Thermal Insulation for High Temperature Superconductor Cable Applications  

NASA Astrophysics Data System (ADS)

High temperature superconducting (HTS) cables are an advanced technology that can both strengthen and improve the national electrical distribution infrastructure. HTS cables require sufficient cooling to overcome inherent low temperature heat loading. Heat loads are minimized by the use of cryogenic envelopes or cryostats. Cryostats require improvement in efficiency, reliability, and cost reduction to meet the demanding needs of HTS conductors (1G and 2G wires). Aspen Aerogels has developed a compression resistant aerogel thermal insulation package to replace compression sensitive multi-layer insulation (MLI), the incumbent thermal insulation, in flexible cryostats for HTS cables. Oak Ridge National Laboratory tested a prototype aerogel package in a lab-scale pipe apparatus to measure the rate of heat invasion. The lab-scale pipe test results of the aerogel solution will be presented and directly compared to MLI. A compatibility assessment of the aerogel material with HTS system components will also be presented. The aerogel thermal insulation solution presented will meet the demanding needs of HTS cables.

White, S.; Demko, J.; Tomich, A.

2010-04-01

86

Electric field analysis on the insulation design of the stop joint box for DC HTS power cable  

NASA Astrophysics Data System (ADS)

DC HTS power cable is a promising electric power transmission line for the future of smart grid, and it has been competitively investigated at many research institutes all over the world. For the commercialization of DC HTS cable, higher power transmission capacity and longer length for long distance transmission line should be prepared. In order to meet the needs of long distance DC HTS cable, a joint box should be developed for the connection of cable components. As for AC HTS cable, a number of patents of nominal joint box have been already reported. However, any conceptual designs of the joint box for DC HTS cable have not been suggested yet. One of the reasons is that the cryogenic high voltage insulation design, especially in DC environment is not fully investigated yet. Conventional normal joint box for AC HTS cable could not be directly applied to DC HTS cable because different electric field distributions compared to AC electric field which requires totally different electrical insulation design concepts. In this paper, in order to establish the basic insulation design of the stop joint box (SJB) for DC HTS cable, three kinds of SJB models were designed and electric field analyses have been conducted both considering AC and DC environment. And the critical factors affecting the DC insulation design of the stop joint box were analyzed. From the simulation results, it was observed that the electric field distribution was totally different both in AC and DC operating conditions. And it was possible to find the weakest regions in the insulation design of the SJB. Consequently, based on the DC electric field analysis, the insulation design criteria and the desirable configurations were suggested for the insulation design of the stop joint box for DC HTS cable.

Hwang, Jae-Sang; Ryoo, Hee-Suk; Koo, Ja-Yoon; Cho, Jeon-Wook; Lee, Bang-Wook

2014-09-01

87

An examination of the potential for nano-composites in the formulation of HV cable insulation  

NASA Astrophysics Data System (ADS)

In order to find an appropriate cable dielectric material, nanodielectrics consisting of silica particles in cross-linked polyethylene (XLPE) have been formulated using melt-mixing. Various types of chemical modifications were provided to the surface of the nanoparticles in order to understand the mechanism of the particle-polymer interface and to tailor the properties of overall composites. The particulates and the composites formulated have been characterized utilizing several techniques such as electron paramagnetic resonance, Fourier transformed infra-red spectroscopy, x-ray photoelectron spectroscopy, nuclear magnetic resonance, and microscopy. These nanomaterials were examined for their electrical attributes, and substantial improvement in electrical voltage endurance was demonstrated. In addition significant improvements in electric strength were measured and other physical properties important to the processing and application of cable dielectrics were not sacrificed. It was established that the interfacial charge build-up that is a common feature of micro-filled material is absent in nanodielectrics, and there was also a reduction in over all permittivity of the nanocomposite below that of the base resin. To understand the mechanism involved in the improvement in the dielectric properties, the chemistry and physics of the particle-polymer interface was crucial. Therefore, some electrical characterizations of the composite materials were performed to find the trap-site separation, trap depth, mobility of the charge carriers, threshold field for internal charge accumulations etc. The chain scission mechanism proposed by Artbauer via free volume theory was extended to the interfacial defects in the composites; the size of such defects being significantly different for the nano- versus micro-composites. The defects resulted in a microcomposite with very low electric strength, and mitigation of the defects via chemical linkage between particle and polymer improved the overall dielectric strength of the nanocomposite. The field at which electron injection occurred was delayed by the surface-treatment provided to the nanoparticles. Particularly the improvement of electric strength for the nano-filled material with polar modifiers was found to be due to charge trapping. For the untreated nano-filled material the charge build-up is absent simply through the leakage via overlapping of conductive interfaces.

Roy, Mihir

88

Forced cooling of underground electric power transmission lines. Part 2: Heat conduction in the cable insulation of force-cooled underground electrical power transmission systems  

Microsoft Academic Search

Forced-cooled systems for oil-filled pipe-type cable circuits are considered. In such systems the conduction resistance through the paper insulation of the cables is the limiting thermal resistance. Assuming bilateral symmetry, steady-state conditions, and two-dimensional heat transfer, a FORTRAN IV computer program was written to solve the heat conduction problem in the cable insulation for arbitrary configurations of a three-cable system.

J. V. Sanders; L. R. Glicksman; W. M. Rohsenow

1974-01-01

89

Electrical aging markers for EPR-based low-voltage cable insulation wiring of nuclear power plants  

NASA Astrophysics Data System (ADS)

This paper presents results of electrical property measurements on EPR-based insulations of low-voltage power cables used in nuclear power plants. The specimens underwent accelerated aging through the simultaneous application of high temperature and gamma-radiation. Mechanical properties and the dielectric response at different frequencies were investigated. Results showed significant variation of the electrical and mechanical properties of aged cables at low frequencies, i.e. lower than 10-2 Hz. In particular, the real and imaginary parts of permittivity increase with aging time, accumulated dose and stress levels applied showing good correlation with elongation at break, which decreases as a function of extent of insulation aging.

Verardi, L.; Fabiani, D.; Montanari, G. C.

2014-01-01

90

Study by simulation of the effect of temperature on the appearance of partial discharges in gaseous cavities contained in the insulator of high voltage cable  

Microsoft Academic Search

Our work treat the effect of the temperature on the appearance of partial discharges in high voltage cables. We modelize the heterogeneous insulator of the cable using finite difference method. The numerical treatment is carried out in bidimensional due to the observed symmetry in the cavities. We simulate regions of weak concentration to an insulator containing one cavity, this is

T. Seghir; A. Nouar; K. Lefkaier; D. Mahi

2003-01-01

91

Forced cooling of underground electric power transmission lines. Part II. Heat conduction in the cable insulation of force-cooled underground electrical power transmission systems. Yearly report  

Microsoft Academic Search

Forced-cooled systems for oil-filled pipe-type cable circuits have recently been considered. In such systems the conduction resistance through the paper insulation of the cables is the limiting thermal resistance. Assuming bilateral symmetry, steady-state conditions, and two-dimensional heat transfer, a FORTRAN IV computer program was written to solve the heat conduction problem in the cable insulation for abritrary configurations of a

J. V. Sanders; L. R. Glicksman; W. M. Rohsenow

1974-01-01

92

Thermodynamic modeling of enhanced superconducting cable insulation for the proposed upgrade of the LHC inner triplet Nb-Ti quadrupole magnets  

NASA Astrophysics Data System (ADS)

The results of thermal modeling of a new cable insulation scheme proposed for a new set of larger aperture Nb-Ti inner triplet quadrupole magnets for LHC upgrade are presented. The new insulation scheme, so called enhanced insulation, is aiming at a more efficient heat transport from the coil to the helium bath. This scheme relies on leaving open helium paths between the bath and the cable. This report summarizes a detailed study of helium cooling channels efficiency in enhanced cable insulation as well as the heat evacuation schemes with respect to different cable insulation winding scheme. A numerical calculations and validation with experimental results showed that heat transfer efficiency of enhanced insulation is reduced, indicating that effective helium channels cross-sections are significant smaller than the nominal ones. The ANSYS analysis confirmed a significant decrease of helium channels cross-section caused by applied pressure. Also a new independent calculation of heat transfer confirmed the results presented in this paper.

Bocian, Dariusz

2013-10-01

93

Basic study of the aging process in solid-dielectric cables (second annual report)  

SciTech Connect

This research program has the two basic objectives of developing an understanding of the basic mechanisms of dielectric aging and of developing an accelerated laboratory test for predicting the service life of underground power transmission cable insulated with solid polyolefin dielectrics. For purposes of this program the polyolefins of interest are limited to conventional low-density polyethylene (LDPE), peroxide-cross-linked, low-density polyethylene (XLPE), and ethylene-propylene rubber (EPR). The program was divided into four sequential tasks: state-of-the-art review of the physics and chemistry of dielectric aging, accelerated life testing, and selected closely related subjects; development of molecular-level models of the dielectric aging process; verification of the aging model through laboratory experimentation with model cables and studies of dielectric material behavior; and development of an accelerated test method and verification of test with full-sized power cable. The general goals and scope of Tasks 1 and 2, which have been completed are reviewed. The initial planning and implementation of Task 3 are described, with detailed discussion of the following activities: detailed planning and initiation of experiments with model cables and slab materials; selection of materials and designs for model cables; manufacture of model cables; evaluation of dielectric materials used for model cable manufacture; establishment of baseline characteristics of model cables; identification of critical equipment and instrument needs; and initial experimental results. (LCL)

Not Available

1982-02-01

94

Equipment qualification research test of electrical cable with factor splices and insulation rework, test No. 2, report No. 1. [PWR; BWR  

SciTech Connect

Electric cables with flame-retardant chemically crosslinked polyolefin extruded insulation containing factory-made center-conductor splices and insulation repairs manufactured by the Rockbestos Company were used in a methodology test of the IEEE Standard 383-1974. Cable specimens were radiation aged at a low-dose rate and then thermally aged to simulate a 40-year containment exposure. After aging, the specimens were subjected to LOCA radiation and a 33-day steam and chemical spray exposure. The cables were electrically loaded and functioned without failure during and after LOCA steam and chemical spray exposure. Insulation resistance measurements were taken during the exposure sequence. Subsequence to the exposures, hipot and mandrel bend tests were conducted. To determine the most severe cable aging sequence, cable insulation material samples were subjected to varied aging exposure to observe sequence-related and dose-rate-related material degradation. A dose-rate effect was observed.

Minor, E.E.; Furgal, D.T.

1982-09-01

95

Discrimination between internal PD and other pulses using directional coupling sensors on HV cable systems  

Microsoft Academic Search

On-site partial discharge (PD) measurement is required to ensure proper installation of extra high voltage (EHV) cable systems accessories. To achieve high sensitivity and good localization, two problems have to be overcome. First, the strong high frequency in long XLPE cables requires that the sensors be located along the cable, preferably directly at the accessories. Secondly, the detection system must

D. Pommerenke; T. Strehl; R. Heinrich; W. Kalkner; F. Schmidt; W. Weissenberg

1999-01-01

96

Electronically controlled cable wrapper  

Microsoft Academic Search

A spindle assembly engages and moves along a length of cable to be wrapped with insulating tape. Reels of insulating tape are mounted on a outer rotatable spindle which revolves around the cable to dispense insulating tape. The rate of movement of the spindle assembly along the length of the cable is controlled by a stepper motor which is programmably

Young

1982-01-01

97

Electronically controlled cable wrapper  

Microsoft Academic Search

A spindle assembly engages and moves along a length of cable to be wrapped with insulating tape. Reels of insulating tape are mounted on a outer rotatable spindle which revolves around the cable to dispense insulating tape. The rate of movement of the spindle assembly along the length of the cable is controlled by a stepper motor which is programmably

Young; Thomas M

1984-01-01

98

Short Racetrack Windings for the Mechanical Characterization of Ceramic-Insulated Cables  

Microsoft Academic Search

Electrical insulation is a key element in high field magnets design. The use of Nb3Sn, winded before reaction and then thermally treated to obtain the superconducting intermetallic compound, supposes to adapt the insulation process. CEA\\/IRFU (FR) is investigating the possibility of using a ceramic electrical insulation that follows the same thermal cycle than the superconductor. This ceramic insulation would make

Pierre Manil; Françoise Rondeaux

2010-01-01

99

The influence of macrofouling on two polymers used as insulation on submarine high voltage cables in Cozumel, Mexico  

SciTech Connect

Macrofouling is a major source of problems causing poor power plant availability and efficiency. A variety of macrofouling control technologies has been developed for use at power plants, however, only one control technology has been designed to protect submarine cables used for electric transmission. The selection of materials possessing antifouling properties is the method used to control the growth of marine fouling organisms. Such methodology is applied in this study with the purpose of evaluating the behavior of two polymers. This practice will permit choosing the polymer that presents the better antifouling properties. In this study are presented the results obtained from the tension and elongation tests accomplished on two kinds of plastic materials: high density polyethylene (PE) and polyvinyl chloride (PVC), both of which were exposed to bio-degradation during 106 and 162 days, at different depths in the Caribbean Sea. The proven materials will be used as electrical insulation in submarine cables of high voltage: 115 kV.

Ramirez-Delgado, R.; Valero-Huerta, M.A. [Lab. de Pruebas de Equipos y Materiales, Irapuato (Mexico)

1995-11-01

100

30 CFR 75.517-2 - Plans for insulation of existing bare power wires and cables.  

...voltage of the circuit. When the tubing is split for purposes of installation, the joints shall be effectively sealed. The butt ends may be sealed with a moisture resistant insulating tape. (3) When tape is used to insulate existing power wires...

2014-07-01

101

30 CFR 75.517-2 - Plans for insulation of existing bare power wires and cables.  

Code of Federal Regulations, 2012 CFR

...voltage of the circuit. When the tubing is split for purposes of installation, the joints shall be effectively sealed. The butt ends may be sealed with a moisture resistant insulating tape. (3) When tape is used to insulate existing power wires...

2012-07-01

102

30 CFR 75.517-2 - Plans for insulation of existing bare power wires and cables.  

Code of Federal Regulations, 2013 CFR

...voltage of the circuit. When the tubing is split for purposes of installation, the joints shall be effectively sealed. The butt ends may be sealed with a moisture resistant insulating tape. (3) When tape is used to insulate existing power wires...

2013-07-01

103

30 CFR 75.517-2 - Plans for insulation of existing bare power wires and cables.  

Code of Federal Regulations, 2011 CFR

...voltage of the circuit. When the tubing is split for purposes of installation, the joints shall be effectively sealed. The butt ends may be sealed with a moisture resistant insulating tape. (3) When tape is used to insulate existing power wires...

2011-07-01

104

Superconductor cable  

DOEpatents

A superconductor cable includes a superconductive cable core (1) and a cryostat (2) enclosing the same. The cable core (1) has a superconductive conductor (3), an insulation (4) surrounding the same and a shielding (5) surrounding the insulation (4). A layer (3b) of a dielectric or semiconducting material is applied to a central element (3a) formed from a normally conducting material as a strand or tube and a layer (3c) of at least one wire or strip of superconductive material is placed helically on top. The central element (3a) and the layer (3c) are connected to each other in an electrically conducting manner at the ends of the cable core (1).

Allais, Arnaud (Hannover, DE); Schmidt, Frank (Langenhagen, DE

2009-12-15

105

30 CFR 75.517-2 - Plans for insulation of existing bare power wires and cables.  

Code of Federal Regulations, 2010 CFR

...ADMINISTRATION, DEPARTMENT OF LABOR COAL MINE SAFETY AND HEALTH MANDATORY...SAFETY STANDARDS-UNDERGROUND COAL MINES Electrical Equipment-General...the District Manager of the Coal Mine Safety District in which...butt ends may be sealed with a moisture resistant insulating...

2010-07-01

106

Selected developments in laser wire stripping. [cutting insulation from aerospace-type wires and cables  

NASA Technical Reports Server (NTRS)

The operation of mechanical and thermal strippers and the early development of laser wire strippers are reviewed. NASA sponsored development of laser wire stripping for space shuttle includes bench-type strippers as well as an advanced portable hand-held stripper which incorporates a miniaturized carbon dioxide laser and a rotating optics unit with a gas-jet assist and debris exhaust. Drives and controls girdle the wire and slit the remaining slug without manual assistance. This unit can strip wire sizes 26 through 12 gage. A larger-capacity hand-held unit for wire sizes through 1/0 gage was built using a neodynium-doped yttrium aluminum garnet (Nd:YAG) laser. The hand-held units have a flexible umbilical cable to an accompanying cart that carries the power supply, gas supply, cooling unit, and the controls.

1977-01-01

107

Flame retardancy of radiation cross-linked poly(vinyl chloride) (PVC) used as an insulating material for wire and cable  

Microsoft Academic Search

Various formulations of radiation cross-linked poly(vinyl chloride) (PVC) were prepared to improve the flame retardancy for wire and cable insulation applications. Limiting oxygen index (LOI) was used to characterize the flammability of the developed formulations. The effect of different plasticizers, dioctyl phthalate (DOP), di-isodecyl phthalate (DIDP) and tri-2-ethylhexyl trimellitate (TOTM) and different flame-retardant fillers, Sb2O3, zinc borate, Al(OH)3 and Mg(OH)2

A. A Basfar

2002-01-01

108

Conductive cable fibers with insulating surface prepared by co-axial electrospinning of multi-walled nanotubes and cellulose  

PubMed Central

A core-sheath of multi-walled carbon nanotube (MWNT)-cellulose fibers of diameters from several hundreds nm to several µm were prepared by co-axial electrospinning from a non-valatile, non-flammable ionic liquid (IL) solvent, 1-methyl-3-methylimidazolium acetate ([EMIM][Ac]). MWNTs were dispersed in IL to form a gel solution. This gel core solution was electrospun surrounded by a sheath solution of cellulose disolved in the same IL. Electrospun fibers were collected in a coagulation bath containing ethanol-water to completely remove the IL and dried to form a core-sheath MWNT-cellulose fibers having a cable structure with a conductive core and insulating sheath. Enzymatic treatment of a portion of a mat of these fibers with cellulase selectively removed the cellulose sheath exposing the MWNT core for connection to an electrode. These MWNT-cellulose fiber mats demonstrated excellent conductivity due to a conductive pathway of bundleled MWNTs. Fiber mat conductivity increased with increasing ratio of MWNT in the fibers with a maximum conductivity of 10.7 S/m obtained at 45 wt% MWNT loading. PMID:20690644

Miyauchi, Minoru; Miao, Jianjun; Simmons, Trevor J.; Lee, Jong-Won; Doherty, Thomas V.; Dordick, Jonathan S.; Linhardt, Robert J.

2010-01-01

109

Electronically controlled cable wrapper  

DOEpatents

A spindle assembly engages and moves along a length of cable to be wrapped with insulating tape. Reels of insulating tape are mounted on a outer rotatable spindle which revolves around the cable to dispense insulating tape. The rate of movement of the spindle assembly along the length of the cable is controlled by a stepper motor which is programmably synchronized to the rate at which rotatable spindle wraps the cable. The stepper motor drives a roller which engages the cable and moves the spindle assembly along the length of the cable as it is being wrapped. The spindle assembly is mounted at the end of an articulated arm which allows free movement of the spindle assembly and allows the spindle assembly to follow lateral movement of the cable.

Young, Thomas M. (Oakland, CA)

1984-01-01

110

Experimental and analytical study of the DC breakdown characteristics of polypropylene laminated paper with a butt gap condition considering the insulation design of superconducting cable  

NASA Astrophysics Data System (ADS)

It has been reported that the insulation design under DC stress is considered as one of the critical factors in determining the performance of high-voltage direct current (HVDC) superconducting cable. Therefore, it is fundamentally necessary to investigate the DC breakdown characteristics of the composite insulation system consisting of liquid nitrogen (LN2)/polypropylene-laminated-paper (PPLP). In particular, the insulation characteristics under DC polarity reversal condition should be verified to understand the polarity effect of the DC voltage considering the unexpected incidents taking place at line-commutated-converters (LCC) under service at a DC power grid. In this study, to examine the variation of DC electric field strength, the step voltage and polarity reversal breakdown tests are performed under DC stress. Also, we investigate the electric field distributions in a butt gap of the LN2/PPLP condition considering the DC polarity reversal by using simulation software.

Seo, In-jin; Choi, Won; Seong, Jae-gyu; Lee, Bang-wook; Koo, Ja-yoon

2014-08-01

111

Submarine Coaxial Cable Pressure Characteristics  

Microsoft Academic Search

In equalization design of submarine coaxial cable system, the cable attenuation deviation due to pressure in deep sea bottom has significant weight. This paper treats the submarine coaxial cable characteristics pressure dependency. By using an artificial ocean test facility, 1.7 inch submarine coaxial cable attenuation, phase, capacitance and insulator core diameter were studied and their pressure coefficients under a pressure

K. Aida; M. Aiki

1978-01-01

112

Comparison of currents predicted by NASCAP/LEO model simulations with elementary Langmuir-type bare probe models for an insulated cable containing a single pinhole  

NASA Technical Reports Server (NTRS)

The behavior of a defect in the insulation of a short biased section of cable in a Low Earth Orbit (LEO) space environment was examined. Such studies are of the utmost importance for large space power systems where great quantities of cabling will be deployed. An insulated probe containing a pinhole was placed into a hypothetical high speed LEO plasma. The NASA Charging Analyzer Program (NASCAP/LEO) was used to explore sheath growth about the probe as a function of applied voltage and to predict I-V behavior. A set of independent current calculations using Langmuir's formulations for concentric spheres and coaxial cylinders were also performed. The case of concentric spheres was here extended to include the case of concentric hemispheres. Several simple Langmuir-type models were then constructed to bracket the current collected by the cable. The space-charge sheath radius and impact parameters were used to determine the proper current regime. I-V curves were plotted for the models and comparisons were made with NASCAP/LEO results. Finally, NASCAP/LEO potential contours and surface cell potential plots were examined to explain interesting features in the NASCAP/LEO I-V curve.

Galofaro, Joel T.

1990-01-01

113

Insulation.  

ERIC Educational Resources Information Center

This instructional unit is one of 10 developed by students on various energy-related areas that deals specifically with insulation. Its objective is for the student to be able to determine insulation needs of new or existing structures, select type to use, use installation techniques, calculate costs, and apply safety factors. Some topics covered…

Rhea, Dennis

114

Effect on de-greasing solvents on conductive separable connector shields and semiconductive cable shields  

SciTech Connect

A study has been conducted to determine the effects of commercial degreasing solvents on the conductivity of an EPDM separable connector shield and two types of cable shields based on EPR and XLPE, respectively. Solvents tested included a chlorinated solvent based on 1,1,1-trichloroethane and several so-called citrus solvents consisting of the natural terpene, limonene, or blends of limonene with other hydrocarbons. All the solvents significantly degraded the conductivity of the EPR and EPDM materials, but had little effect on the XLPE cable shield. The solvents differed, however, in the extent of their effects, the rate of recovery of conductivity after removal of the solvent, and the degree to which the original conductivity of the material was restored. The consequences of these results in terms of appropriate field use of these types of solvents by utility personnel are discussed.

Perry, D.D.; Bolcar, J.P. (Amerace Corp., Hackettstown, NJ (USA). Elastimold Div.)

1990-04-01

115

Extruded dielectric dc cable development  

Microsoft Academic Search

An extruded 100 kilovolt (kV), direct-current (dc) cable insulated with mineral filled polymeric dielectrics was developed. The analysis of the factors controlling the rated stress and load limits indicated that capabilities of an extruded dc cable could be improved by reducing the dependency of electrical resistivity on temperature and the thermal resistivity of the dielectrics. It was experimentally determined that

S. E. Kiersztyn; B. T. MacKenzie

1980-01-01

116

Stress concentrations caused during telecom cable stripping  

Microsoft Academic Search

This paper is a compendium of the steps taken to determine the effect of nicked wire strands as could occur during the stripping of wire and cable insulation. The background of this work is based on a question often asked by telecom engineers and technicians. What happens to wires and cables when they are accidentally nicked when stripping the insulation?

R. Lai

2004-01-01

117

COPPER CABLE RECYCLING TECHNOLOGY  

SciTech Connect

The United States Department of Energy (DOE) continually seeks safer and more cost-effective technologies for use in deactivation and decommissioning (D&D) of nuclear facilities. The Deactivation and Decommissioning Focus Area (DDFA) of the DOE's Office of Science and Technology (OST) sponsors large-scale demonstration and deployment projects (LSDDPs). At these LSDDPs, developers and vendors of improved or innovative technologies showcase products that are potentially beneficial to the DOE's projects and to others in the D&D community. Benefits sought include decreased health and safety risks to personnel and the environment, increased productivity, and decreased costs of operation. The Idaho National Engineering and Environmental Laboratory (INEEL) generated a list of statements defining specific needs and problems where improved technology could be incorporated into ongoing D&D tasks. One such need is to reduce the volume of waste copper wire and cable generated by D&D. Deactivation and decommissioning activities of nuclear facilities generates hundreds of tons of contaminated copper cable, which are sent to radioactive waste disposal sites. The Copper Cable Recycling Technology separates the clean copper from contaminated insulation and dust materials in these cables. The recovered copper can then be reclaimed and, more importantly, landfill disposal volumes can be reduced. The existing baseline technology for disposing radioactively contaminated cables is to package the cables in wooden storage boxes and dispose of the cables in radioactive waste disposal sites. The Copper Cable Recycling Technology is applicable to facility decommissioning projects at many Department of Energy (DOE) nuclear facilities and commercial nuclear power plants undergoing decommissioning activities. The INEEL Copper Cable Recycling Technology Demonstration investigated the effectiveness and efficiency to recycle 13.5 tons of copper cable. To determine the effectiveness of separating out radioactive contamination, the copper cable was coated with a surrogate contaminant. The demonstration took place at the Bonneville County Technology Center in Idaho Falls, Idaho.

Chelsea Hubbard

2001-05-01

118

Test of two prototype high-temperature superconducting transmission cables  

SciTech Connect

Two 500-A class prototype high-temperature superconducting cables have been constructed by Southwire Company and tested at Oak Ridge National Laboratory (ORNL). In the first cable, no insulation was used to separate the individual HTS tapes. In the second cable, Kapton tape was used to insulate the HTS tapes between successive layers for the study of AC loss and current distribution. The cables were tested with both DC and AC currents in liquid nitrogen from 77 to 69 K. Both cables achieved DC critical current, I{sub c} greater than 500 A. A calorimetric technique that measures the cable temperature rise under ac currents was used to measure the ac loss of the cables. The un-insulated cable showed a cryoresistive behavior under the 60 Hz AC currents. The insulated cable started to show measurable loss at current where there was corresponding resistive loss.

Lue, J.W.; Lubell, M.S.; Kroeger, D.M.; Martin, P.M. [Oak Ridge National Lab., TN (United States); Demko, J.A.; Jones, E.C. [Oak Ridge Associated Universities, Inc., TN (United States); Sinha, U.; Hughey, R.L. [Southwire Co., Carrollton, GA (United States)

1996-10-01

119

Basic Studies of Applications of Biodegradable Polymer PLLA to Insulation of Electric Wires  

Microsoft Academic Search

We developed equipment for manufacturing a biodegradable-polymer-insulated cable with various functional properties. Using this equipment, we manufactured a poly-l-lactic acid (PLLA)-insulated electric cable and evaluated its basic electrical insulation characteristics. The mean dielectric breakdown strength of the PLLA-insulated electric cable was approximately 3.5 times that of a polyvinyl chloride-insulated electric cable (VV electric cable). The result of bending and weathering

Takuo NAKIRI; Yuuki KAWACHI; Masahiro HONDA; Kenji IMOTO; Takayuki YAMAKITA; Yoshiro TAJITSU

120

Semiannual report for the period April 1-September 30, 1979 of work on: (1) Superconducting power transmission development; (2) Cable insulation development. Power Transmission Project Technical Note No. 99  

SciTech Connect

The objective of the program is to develop an underground superconducting power transmission system which is economical and technically attractive to the utility industry. The system would be capable of carrying very large blocks of electric power, thus enabling it to supplant overhead lines in urban and suburban areas and regions of natural beauty. The program consisted initially of work in the laboratory to develop suitable materials, cryostats, and cable concepts. The materials work covers the development and testing of suitable superconductors and dielectric insulation. The laboratory work has now been extended to an outside test facility which represents an intermediate step between the laboratory scale and a full-scale system. The facility will allow cables several hundred feet long to be tested under realistic conditions. In addition, the refrigerator has been designed for optimum service for utility applications.

Not Available

1980-01-15

121

Cable Economics.  

ERIC Educational Resources Information Center

A guide to the economic factors that influence cable television systems is presented. Designed for local officials who must have some familiarity with cable operations in order to make optimum decisions, the guide analyzes the financial framework of a cable system, not only from the operators viewpoint, but also from the perspective of the…

Cable Television Information Center, Washington, DC.

122

High conductance surge cable  

DOEpatents

An electrical cable for connecting transient voltage surge suppressers to ectrical power panels. A strip of electrically conductive foil defines a longitudinal axis, with a length of an electrical conductor electrically attached to the metallic foil along the longitudinal axis. The strip of electrically conductive foil and the length of an electrical conductor are covered by an insulating material. For impedance matching purposes, triangular sections can be removed from the ends of the electrically conductive foil at the time of installation.

Murray, Matthew M. (Espanola, NM); Wilfong, Dennis H. (Brooksville, FL); Lomax, Ralph E. (Santa Fe, NM)

1998-01-01

123

High conductance surge cable  

DOEpatents

An electrical cable for connecting transient voltage surge suppressors to electrical power panels. A strip of electrically conductive foil defines a longitudinal axis, with a length of an electrical conductor electrically attached to the metallic foil along the longitudinal axis. The strip of electrically conductive foil and the length of an electrical conductor are covered by an insulating material. For impedance matching purposes, triangular sections can be removed from the ends of the electrically conductive foil at the time of installation. 6 figs.

Murray, M.M.; Wilfong, D.H.; Lomax, R.E.

1998-12-08

124

Operational characteristics of trailing cable splices  

SciTech Connect

The US Bureau of Mines investigated the operational characteristics of spliced portable power cables. This research had a dual purpose: (1) to determine the thermal and mechanical performance of repaired trailing cables and compare them with undamaged cables, and (2) to gauge the impact of long-term localized heating on the insulating and jacketing materials contained in cable splice kits accepted or approved by the Mine Safety and Health Administration. The ranges of splice joint resistance and tensile breaking strength were determined from laboratory measurements. The choice of crimping tools affected the strength of the splice under tension. Thermal profiles of energized spliced cables were constructed, which showed that spliced cables were constructed, which showed that spliced conductor joints operated 5 to 20 C hotter than the intact cable at rated currents. Accelerated life tests of thermally-aged samples of splice kit insulation and jacket materials confirmed a deficiency in the thermal rating of the insulating tape. The recommendations in this paper may be utilized to revise splice kit design, splice kit acceptance criteria, and trailing cable loading guidelines. Characterizing the thermal operating limits of spliced trailing cables may help to minimize associated risks from explosions, fires, personnel burns, and shock.

Yenchek, M.R.; Schuster, K.C.; Hudson, A.J. [Bureau of Mines, Pittsburgh, PA (United States). Pittsburgh Research Center

1995-12-31

125

Initial increased wear debris of XLPE-Al 2 O 3 bearing in total hip arthroplasties  

Microsoft Academic Search

Introduction  Aseptic implant loosening caused by wear debris is a common reason for early implant failure after total hip replacement (THR).\\u000a \\u000a \\u000a \\u000a Materials and methods  We prospectively studied 96 patients (110 hips), 48 men and 48 women (mean age 46.8 years, mean body mass index 26.1) who\\u000a had undergone cementless THR (titanium stem, press-fit cup, Al2O3 ball, XLPE liner) at a mean of 17.4 months

Marcus Jäger; Michael Behringer; Christoph Zilkens; Travis Matheney; Rüdiger Krauspe

2010-01-01

126

46 CFR 183.340 - Cable and wiring requirements.  

Code of Federal Regulations, 2012 CFR

...greater than 50 volts, the wire must be in conduit. (b) All cable and wire must: (1) Have...Be suitable for low temperature and high humidity if...9) Have sheathing or wire insulation compatible...except that asbestos insulated cable and dry...

2012-10-01

127

46 CFR 129.340 - Cable and wiring.  

Code of Federal Regulations, 2013 CFR

...greater than 50 volts, the wire and associated conduit... (b) Each cable and wire must— (1) Have...Be suitable for low temperature and high humidity, if...9) Have sheathing or wire insulation compatible...except that no asbestos-insulated cable or...

2013-10-01

128

46 CFR 183.340 - Cable and wiring requirements.  

...greater than 50 volts, the wire must be in conduit. (b) All cable and wire must: (1) Have...Be suitable for low temperature and high humidity if...9) Have sheathing or wire insulation compatible...except that asbestos insulated cable and dry...

2014-10-01

129

46 CFR 183.340 - Cable and wiring requirements.  

Code of Federal Regulations, 2013 CFR

...greater than 50 volts, the wire must be in conduit. (b) All cable and wire must: (1) Have...Be suitable for low temperature and high humidity if...9) Have sheathing or wire insulation compatible...except that asbestos insulated cable and dry...

2013-10-01

130

46 CFR 129.340 - Cable and wiring.  

...greater than 50 volts, the wire and associated conduit... (b) Each cable and wire must— (1) Have...Be suitable for low temperature and high humidity, if...9) Have sheathing or wire insulation compatible...except that no asbestos-insulated cable or...

2014-10-01

131

46 CFR 129.340 - Cable and wiring.  

Code of Federal Regulations, 2012 CFR

...greater than 50 volts, the wire and associated conduit... (b) Each cable and wire must— (1) Have...Be suitable for low temperature and high humidity, if...9) Have sheathing or wire insulation compatible...except that no asbestos-insulated cable or...

2012-10-01

132

Power Cables in the Twenty-First Century  

Microsoft Academic Search

This paper presents a variety of viewpoints from engineers within the power cable industry as to how current trends in the cable industry will influence future cable designs, particularly with polymeric insulation, lapped dielectrics, and improved diagnostic techniques. The use of high-temperature superconductors and designer polymers as well as the possible availability of conducting polymeric materials is also considered. The

T. J. HAMMONS

2003-01-01

133

The effect of space charge on phenomenology of partial discharges in insulation cavities  

Microsoft Academic Search

The effect of space charge accumulated in insulation cavities on partial discharge activity is dealt with in the paper. Partial discharges were measured on non-polarized and DC-polarized XLPE specimens. In order to characterize space charge distribution, pulsed-electroacoustic (PEA) space charge measurements were also performed on polarized and PD-aged specimens. The results show that space charge can affect, although in some

A. Cavallini; F. Ciani; G. C. Montanari

2005-01-01

134

An Analysis and Verification on Deterioration Patterns of Faulted Cables for Resolution of Product Liability Conflicts  

Microsoft Academic Search

In order to examine the causes of faulted cables under the operation of product liability(PL) law, it was necessary to database the patterns of faulted cables in materials for electric conductivity and insulation. Accurate analyses such as external and surface analysis were performed for the faulted cables and the over-current was given to copper wire used as a cable conductor

Young-Seok Kim; Kil-Mok Shong; Sun-Gu Kim

2007-01-01

135

Cable Tester  

NASA Technical Reports Server (NTRS)

NASA Tech Brief's provided Sonics Associates, Inc. with a method of saving many hours of testing time and money. James B. Cawthon, Sonics Vice-President, read about a device developed at Ames Research Center. Sonics adapted the device and produced an effective tester that uses a clocked shift register to apply a voltage to a cable under test. This is the active part of the Ames development, and the passive is a small box containing light emitting diodes (LEDs). When connected to the other end of the tested cable, the LEDs light in the same sequence as the generator. This procedure allows the technician to immediately identify a miswired cable.

1989-01-01

136

Extending cable life with better jackets  

SciTech Connect

Better materials may result from a $1.1 million research program funded by the Electric Power Research Institute, Palo Alto, California and awarded to Southwire Co., Carrollton, Ga. The University of Connecticut`s Electrical Insulation Center (EIRC) will assist Southwire in testing the results of a recent study that found a promising new way to improve the protective jackets on underground power cables. EIRC`s Director Matthew Mashikian said, {open_quotes}Extending the life of power cables with a better jacket is worth millions to utility companies and their customers.{close_quotes} EIRC has a patent pending on a method of using chemical scavengers to reduce the presence of ions in groundwater that can penetrate a power cable`s jacket and invade the insulation.

NONE

1995-05-01

137

Dielectric properties of XLPE\\/Sio2 nanocomposites based on CIGRE WG D1.24 cooperative test results  

Microsoft Academic Search

A comprehensive experimental investigation of XLPE and its nanocomposite with fumed silica (SiO2) has been performed by CIGRE Working Group D1.24, in cooperative tests conducted by a number of members; covering materials characterization, real and imaginary permittivity, dc conductivity, space charge formation, dielectric breakdown strength, and partial discharge resistance. The research is unique, since all test samples were prepared by

Toshikatsu Tanaka; Alexander Bulinski; Jerome Castellon; Michel Frechette; Stanislaw Gubanski; Josef Kindersberger; Gian Montanari; Masayuki Nagao; Peter Morshuis; Yasuhiro Tanaka; Serge Pelissou; Alun Vaughan; Yoshimichi Ohki; Clive Reed; Simon Sutton; Suh Han

2011-01-01

138

Wire and Cable Cold Bending Test  

NASA Technical Reports Server (NTRS)

One of the factors in assessing the applicability of wire or cable on the lunar surface is its flexibility under extreme cold conditions. Existing wire specifications did not address their mechanical behavior under cold, cryogenic temperature conditions. Therefore tests were performed to provide this information. To assess this characteristic 35 different insulated wire and cable pieces were cold soaked in liquid nitrogen. The segments were then subjected to bending and the force was recorded. Any failure of the insulation or jacketing was also documented for each sample tested. The bending force tests were performed at room temperature to provide a comparison to the change in force needed to bend the samples due to the low temperature conditions. The results from the bending tests were plotted and showed how various types of insulated wire and cable responded to bending under cold conditions. These results were then used to estimate the torque needed to unroll the wire under these low temperature conditions.

Colozza, Anthony

2010-01-01

139

Cable Television.  

ERIC Educational Resources Information Center

This report provides information about cable television and the Federal Communications Commission's (FCC) responsibilities in regulating its operation. The initial jurisdiction and rules covered in this report pertain to the court test, public hearing, certificate of compliance, franchising, signal carriage, leapfrogging, access and origination…

Federal Communications Commission, Washington, DC.

140

Analysis of Surveyor 3 television cable  

NASA Technical Reports Server (NTRS)

A sample of cable described as four inches of TV cable, fabric wrapped, which had been exposed to the atmosphere for an unknown period of time, was subjected to extensive chemical analyses for the various components. The fabric was tested using attenuated total reflectance, chloroform extract, aqueous extraction, pyrolysis infrared, and reflectance spectroscopy. The wire insulation was tested using pyrolysis infrared, pyrolysis gas chromatography, differential thermal analysis, attenuated total reflectance subsurface, and tensile tests. Corrosion was also observed in parts of certain wires.

Gross, F. C.; Park, J. J.

1972-01-01

141

Extruded dielectric dc cable development. Final report  

Microsoft Academic Search

The development of an extruded 100-kilovolt (kV), direct-current (dc) cable insulated with mineral-filled polymeric dielectrics is described. Analysis of the factors controlling the rated stress and load limits indicated that capabilities of an extruded dc cable could be improved by reducing the dependency of electrical resistivity on temperature and the thermal resistivity of the dielectrics. It was experimentally determined that

S. E. Kiersztyn; B. T. MacKenzie

1980-01-01

142

Elements of a specification for superconducting cable and why they are important for magnet construction  

NASA Astrophysics Data System (ADS)

The purpose of this paper is to point out several features of the specification for SSC superconducting cable and its insulation that are important for fabrication of dipole magnet coils. Among these are the dimensions of the cable and insulation and their relevance for obtaining coils with appropriate overall dimensions. Other important cable properties are related to the twist direction of wire used to fabricate it and the opposite twist (or lay) direction of the cable. For some coils it is easier to work with cable of a particular lay direction. In conjunction with the ease of coil winding comes the requirement in the specification for superconducting cable which restricts the cable surface condition. The ease of winding coils is governed by the ability to bend and twist the cable at the coil ends without having wires come out of place, possibly later leading to insulation damage and a turn-to-turn short.

Greene, A. F.; Scanlan, R. M.

143

Elements of a specification for superconducting cable and why they are important for magnet construction  

SciTech Connect

The purpose of this paper is to point out several features of the specification for SSC superconducting cable and its insulation that are important for fabrication of dipole magnet coils. Among these are the dimensions of the cable and insulation and their relevance for obtaining coils with appropriate overall dimensions, Other important cable properties are related to the twist direction of wire used to fabricate it and the opposite twist (or lay) direction of the cable. For some coils it is easier to work with cable of a particular lay direction. In conjunction with the ease of coil winding comes the requirement in the specification for superconducting cable which restricts the cable surface condition. The ease of winding coils is governed by the ability to bend and twist the cable at the coil ends without having wires come out of place, possibly later leading to insulation damage and a turn-to-turn short. 5 refs., 11 figs., 1 tab.

Greene, A.F.; Scanlan, R.M.

1989-01-01

144

Solenoid Winding Using YBCO Roebel Cable  

NASA Astrophysics Data System (ADS)

Solenoid windings of Roebel cable are expected to find application in high field magnets and power equipment. We demonstrate using YBCO Roebel cable to wind a single layer solenoid and report initial mechanical and electrical characteristics. We wind the coil with a 5/2 cable of 7.2 m length with insulated strands to prevent current sharing. Mechanical tests show the cables retain substantially the strength of the constituent wire even under bending with no observable change in Ic for tensile stresses below ? 350 MPa. We demonstrate a design of the current contacts which promote equal distribution of current in the strands. We report the critical current of the coil and the total AC loss of the coil in liquid nitrogen. These values are compared with the values for straight sections of cable.

Badcock, R. A.; Bumby, C.; Jiang, Z.; Long, N. J.

145

30 CFR 75.604 - Permanent splicing of trailing cables.  

Code of Federal Regulations, 2010 CFR

...ADMINISTRATION, DEPARTMENT OF LABOR COAL MINE SAFETY AND HEALTH MANDATORY SAFETY STANDARDS-UNDERGROUND COAL MINES Trailing Cables § 75.604...Effectively insulated and sealed so as to exclude moisture; and (c) Vulcanized or...

2010-07-01

146

Termination of flat conductor cable to NASA/MSFC plugs  

NASA Technical Reports Server (NTRS)

Data, supplemented with artwork, are presented on the major steps involved with terminating flat conductor cable (FCC) to MSFC's FCC plugs. Cable and shield preparation steps include material cutting, insulation stripping, and plating of exposed conductors. Methods and equipment required to terminate FCC to each of four MSFC plugs are described.

Angele, W.

1972-01-01

147

Strengthening future electricity grid of the Netherlands by integration of HTS transmission cables  

NASA Astrophysics Data System (ADS)

The electricity grid of the Netherlands is changing. There is a call of society to use more underground cables, less overhead lines (OHL) and to reduce magnetic emissions. At the same time, parts of the future transmission grid need strengthening depending on the electricity demand in the coming decades [1]. Novel high temperature superconductor (HTS) AC transmission cables can play a role in strengthening the grid. The advantages as compared to alternatives, are: economic, underground, higher power capacity, lower losses, reduced magnetic field emissions in (existing) OHL, compact: less occupation of land and less permits needed, a possibility to keep 380 kV voltage level in the grid for as long as needed. The main obstacles are: the relatively high price of HTS tapes and insufficient maturity of the HTS cable technology. In the paper we focus on a 34 km long connection in the transmission grid (to be strengthened in three of the four of TenneT scenarios [1]), present the network study results, derive the requirements for corresponding HTS transmission cable system and compare HTS system to the alternatives (OHLs and XLPE cables).

Zuijderduin, Roy; Chevtchenko, Oleg; Smit, Johan; Aanhaanen, Gert; Ross, Rob

2014-05-01

148

An Internal Coaxial Cable Electrical Connector For Use In Downhole Tools  

DOEpatents

A coaxial cable electrical connector more specifically an internal coaxial cable connector placed within a coaxial cable and its constituent components. A coaxial cable connector is in electrical communcation with an inductive transformer and a coaxial cable. The connector is in electrical communication with the outer housing of the inductive transfonner. A generally coaxial center conductor, a portion of which could be the coil in the inductive transformer, passes through the connector, is electrically insulated from the connector, and is in electrical communication with the conductive care of the coaxial cable. A plurality of bulbous pliant tabs on the coaxial cable connector mechanically engage the inside diameter of the coaxial cable thus grounding the transformer to the coaxial cable. The coaxial cable and inductive transformer are disposed within downhole tools to transmit electrical signals between downhole tools within a drill string.

Hall, David R. (Provo, UT); Hall, Jr., H. Tracy (Provo, UT); Pixton, David S. (Lehi, UT); Dahlgren, Scott (Provo, UT); Fox, Joe (Spanish Fork, UT); Sneddon, Cameron (Provo, UT); Briscoe, Michael (Lehi, UT)

2005-11-29

149

Universal Cable Brackets  

NASA Technical Reports Server (NTRS)

Concept allows routing easily changed. No custom hardware required in concept. Instead, standard brackets cut to length and installed at selected locations along cable route. If cable route is changed, brackets simply moved to new locations. Concept for "universal" cable brackets make it easy to route electrical cable around and through virtually any structure.

Vanvalkenburgh, C.

1985-01-01

150

Cable-splice detector  

NASA Technical Reports Server (NTRS)

Detector has possible uses in aerial cable-car systems, equipment handling in mines, boreholes, and undersea operations, and other applications where moving steel cable must be measured, monitored, or controlled. Detector consists of Hall-effect magnetic sensor located close to cable. Magnetic markings on cable are converted to electrical signals. Signals are filtered, amplified, and can actuate alarm.

Lee, R. D.; Iufer, E. J.; Giovannetti, A.

1980-01-01

151

Cable-Twisting Machine  

NASA Technical Reports Server (NTRS)

New cable-twisting machine is smaller and faster than many production units. Is useful mainly in production of short-run special cables. Already-twisted cable can be fed along axis of machine. Faster operation than typical industrial cable-twisting machines possible by using smaller spools of wire.

Kurnett, S.

1982-01-01

152

Removal of lead compounds from polyvinylchloride in electric wires and cables using cation-exchange resin.  

PubMed

Recycling treatment of cable insulation resin generated from electric wires and cables was investigated. Conventional insulation PVC contains a lead component, tribase, as a thermal stabilizer and lead removal is necessary to recycle this PVC as insulation resin. This paper describes a solid surface adsorption method using ion exchange resin to remove the fine lead containing particles from PVC dissolved solution. Low lead concentration in the recovered PVC, complying with the requirements of RoHS, was achieved. PMID:21600692

Tsunekawa, Masami; Ito, Mayumi; Yuta, Sasaki; Tomoo, Sakai; Hiroyoshi, Naoki

2011-07-15

153

Development of extruded dielectric underground transmission cables rated 138 kV, 230 kV, and 345 kV. Final report  

Microsoft Academic Search

This report covers the continuation of the work to develop technology to manufacture chemically crosslinked polyethylene insulated power cables in the ac voltage range of 138 kV to 345 kV having insulation thicknesses approximately equal to that of oil impregnated paper insulated cables. It also incorporates the development of field molded splices and terminations for new high voltage stress 138

G. Bahder; L. A. Bopp; G. S. Eager; C. Katz; A. Knott; G. A. Schmidt

1982-01-01

154

A study on the composite dielectric properties for an HTS cable  

Microsoft Academic Search

In order to optimize the insulation design of a cold dielectric high temperature superconducting (HTS) cable, the composite insulation system has been investigated according to the arrangement of laminated polypropylene paper (LPP) and kraft paper in liquid nitrogen. LPP is a prominent insulating material with a high dielectric strength and low dielectric loss, which has been used previously as a

D. S. Kwag; V. D. Nguyen; S. M. Baek; H. J. Kim; J. W. Cho; S. H. Kim

2005-01-01

155

Marine cable location system  

SciTech Connect

An acoustic positioning system locates a marine cable at an exploration site, such cable employing a plurality of hydrophones at spaced-apart positions along the cable. A marine vessel measures water depth to the cable as the vessel passes over the cable and interrogates the hydrophones with sonar pulses along a slant range as the vessel travels in a parallel and horizontally offset path to the cable. The location of the hydrophones is determined from the recordings of water depth and slant range.

Zachariadis, R.G.

1984-05-01

156

Development of extruded dielectric underground transmission cables rated 138 kV, 230 kV and 345 kV, volume 2  

Microsoft Academic Search

Technology to manufacture chemically crosslinked polyethylene insulated power cables in the ac voltage range of 138 kV to 345 kV having insulation thicknesses approximately equal to that of oil impregnated paper insulated cables is developed. The development of field molded splices and terminations for high voltage stress 138 kV cables are also incorporated. After reviewing the main equipment elements, incorporated

G. Bahder; L. A. Bopp; G. S. Eager; C. Katz; A. Knott; G. A. Schmidt

1982-01-01

157

Cable load sensing device  

SciTech Connect

Apparatus for sensing the magnitude of a load on a cable as the cable is employed to support the load includes a beam structure clamped to the cable so that a length of the cable lies along the beam structure. A spacer associated with the beam structure forces a slight curvature in a portion of the length of cable under a cable no-load condition so that the portion of the length of cable is spaced from the beam structure to define a cable curved portion. A strain gauge circuit including strain gauges is secured to the beam structure by welding. As the cable is employed to support a load the load causes the cable curved portion to exert a force normal to the cable through the spacer and on the beam structure to deform the beam structure as the cable curved portion attempts to straighten under the load. As this deformation takes place, the resistance of the strain gauges is set to a value proportional to the magnitude of the normal strain on the beam structure during such deformation. The magnitude of the normal strain is manipulated in a control device to generate a value equal to the magnitude or weight of the load supported by the cable.

Beus, M.J.; McCoy, W.G.

1996-12-31

158

Cable load sensing device  

DOEpatents

Apparatus for sensing the magnitude of a load on a cable as the cable is employed to support the load includes a beam structure clamped to the cable so that a length of the cable lies along the beam structure. A spacer associated with the beam structure forces a slight curvature in a portion of the length of cable under a cable "no-load" condition so that the portion of the length of cable is spaced from the beam structure to define a cable curved portion. A strain gauge circuit including strain gauges is secured to the beam structure by welding. As the cable is employed to support a load the load causes the cable curved portion to exert a force normal to the cable through the spacer and on the beam structure to deform the beam structure as the cable curved portion attempts to straighten under the load. As this deformation takes place, the resistance of the strain gauges is set to a value proportional to the magnitude of the normal strain on the beam structure during such deformation. The magnitude of the normal strain is manipulated in a control device to generate a value equal to the magnitude or weight of the load supported by the cable.

Beus, Michael J. (Spokane, WA); McCoy, William G. (Spokane, WA)

1998-01-01

159

Vertex Detector Cable Considerations  

SciTech Connect

Vertex detector cable requirements are considered within the context of the SiD concept. Cable material should be limited so that the number of radiation lengths represented is consistent with the material budget. In order to take advantage of the proposed accelerator beam structure and allow cooling by flow of dry gas, 'pulsed power' is assumed. Potential approaches to power distribution, cable paths, and cable design for operation in a 5 T magnetic field are described.

Cooper, William E.; /Fermilab

2009-02-01

160

Mechanically improved rectangular cable  

Microsoft Academic Search

Most electrical cables for superconducting magnets are made from round strands twisted into a hollow spiral and compacted into a two layer rectangular cross-section (called Rutherford cable). It is used to make compact electrical coils when a stranded conductor is required. A significant improvement has been conceived and improved cable has been fabricated. The improvement avoids the effect in the

A. R. Borden; R. C. Wolgast

1983-01-01

161

Modeling vibration response and damping of cables and cabled structures  

NASA Astrophysics Data System (ADS)

In an effort to model the vibration response of cabled structures, the distributed transfer function method is developed to model cables and a simple cabled structure. The model includes shear effects, tension, and hysteretic damping for modeling of helical stranded cables, and includes a method for modeling cable attachment points using both linear and rotational damping and stiffness. The damped cable model shows agreement with experimental data for four types of stranded cables, and the damped cabled beam model shows agreement with experimental data for the cables attached to a beam structure, as well as improvement over the distributed mass method for cabled structure modeling.

Spak, Kaitlin S.; Agnes, Gregory S.; Inman, Daniel J.

2015-02-01

162

Aging, Loss-of-Coolant Accident (LOCA), and high potential testing of damaged cables  

SciTech Connect

Experiments were conducted to assess the effects of high potential testing of cables and to assess the survivability of aged and damaged cables under Loss-of-Coolant Accident (LOCA) conditions. High potential testing at 240 Vdc/mil on undamaged cables suggested that no damage was incurred on the selected virgin cables. During aging and LOCA testing, Okonite ethylene propylene rubber (EPR) cables with a bonded jacket experienced unexpected failures. The failures appear to be primarily related to the level of thermal aging and the presence of a bonded jacket that ages more rapidly than the insulation. For Brand Rex crosslinked polyolefin (XLPO) cables, the results suggest that 7 mils of insulation remaining should give the cables a high probability of surviving accident exposure following aging. The voltage necessary to detect when 7 mils of insulation remain on unaged Brand Rex cables is approximately 35 kVdc. This voltage level would almost certainly be unacceptable to a utility for use as a damage assessment tool. However, additional tests indicated that a 35 kvdc voltage application would not damage virgin Brand Rex cables when tested in water. Although two damaged Rockbestos silicone rubber cables also failed during the accident test, no correlation between failures and level of damage was apparent.

Vigil, R.A. [Science & Engineering Associates, Inc., Albuquerque, NM (United States); Jacobus, M.J. [Sandia National Labs., Albuquerque, NM (United States)

1994-04-01

163

Proceedings: JICABLE/EPRI/CEA workshop Cable 89''  

SciTech Connect

This report presents the proceedings of the workshop Cable 89'' on the Aging of Extruded Dielectric Cables. The workshop was held in St. Petersburg Beach, Florida, on November 2--3, 1989. The sponsoring organizations are the Electric Power Research Institute (US), the Canadian Electric Association and JICABLE (France). Attendance at the workshop was by invitation only, and attendees included 60 representatives of universities, research organizations, electric utilities, and manufacturers of insulating polymers and power cables, from ten countries. The workshop was created as a forum for world experts to relate and compare their service experiences, theoretical, fundamental and experimental studies, and test results on the topic of aging of solid dielectric cables. The overall topic included materials aging, cable and accessories aging, diagnostic tests, accelerated aging and service experiences and conditions. Workshop discussions were recorded, transcribed and edited and included in the proceedings. Conclusions (representing an informal consenus of the attendees) are also included in the report.

Braodhurst, M.G. (ed.) (Broadhurst Consulting, Washington Grove, MD (USA)); Kelley, E.F. (KELTEK, Montpelier, ID (USA))

1990-12-01

164

Power-Frequency Voltage Withstand Characteristics of Insulations of Substation Secondary Systems  

Microsoft Academic Search

The insulation of secondary system in substation, including secondary cables and devices, have to endure the high ac power-frequency voltage during the short-circuit fault. The ac withstand characteristics of the secondary cables and devices are experimentally investigated and discussed in this paper. The insulation breakdown mechanism of relays can be classified into three modes: air gap breakdown, creeping discharge, and

Jinliang He; Zhanqing Yu; Rong Zeng; Bo Zhang; Shuiming Chen; Jun Hu

2010-01-01

165

Magnet cable manufacturing  

SciTech Connect

The cable is the heart of a superconducting accelerator magnet. Since the initial development of the Rutherford Cable more than twenty years ago, many improvements in manufacturing techniques have increased the current carrying capacity. When the Tevatron cable was specified fifteen years ago the current carrying capacity was 1800 A/mm{sup 2} at a field of 5.3T. During the intervening years it has been increased to 3000 A/mm{sup 2}. These improvements were due to refinements in the fabrication of the strands and the formation of the cable from the strands. The metallurgists were able to impart significant gains in performance by improving the homogeneity of the conductor. The engineers and technicians who designed and built the modern cabling machines made an enormous contribution by significantly reducing the degradation of wire performance that occurs when the wire was cabled. The fact that these gains were made while increasing the speed of cabling is one of the technological advances that made accelerators like the SSC possible. This article describes the cabling machines that were built to manufacture the cable for the full scale SSC prototype magnets and the low beta quadrupoles for the Fermilab Tevatron. This article also presents a compendium of the knowledge that was gained in the struggle to make high performance cable to exacting dimensional standards and at the throughput needed for the SSC. The material is an important part of the technology transfer from the Department of energy Laboratories to Industry.

Royet, J.

1990-10-01

166

HTS cable design and evaluation in YOKOHAMA Project  

NASA Astrophysics Data System (ADS)

HTS cable demonstration project supported by Ministry of Economy, Trade and Industry (METI) and New Energy and Industrial Technology Development Organization (NEDO) has started since FY 2007 in Japan. The target of this project is to operate a 66 kV, 200 MVA HTS cable in the live network of Tokyo Electric Power Company (TEPCO) in order to demonstrate its reliability and stable operation. Various preliminary tests with the short core samples were conducted to confirm the HTS cable design. One of the technical targets in this project is to reduce the AC losses of HTS cable cores. For this purpose, a new type DI-BSCCO wire with twisted superconducting filaments which is named TypeAC is applied in the cable core. A short cable core made with TypeAC wires shows its AC loss is 0.8 W/m/ph at 2 kArms, which is about 1/4 of the one with standard DI-BSCCO wires. Another important target is to manage a fault current. At a preliminary test with the short cable cores, it showed that the cable could manage the through-fault of 10 kA at 2 sec and survived at 31.5 kA at 2 sec. As the electric insulation tests, AC 90 kV for 3 hours and lightning impulse at ±385kV, 3 shots for each were applied to a cable core, successfully. The results of tensile and bending tests showed the cable core has good mechanical properties. The design of the HTS cable for YOKOHAMA project has been completed as well as those of a termination and a joint. A 30-meter HTS cable was manufactured and a 30-meter HTS cable system was installed in SEI facility. The cable system was cooled down and tested to verify its performance before constructing the HTS cable system in YOKOHAMA. This paper describes the design and test results of the 30-meter HTS cable, and also performance test results of the 30-meter cable system.

Yumura, H.; Ohya, M.; Ashibe, Y.; Watanabe, M.; Minamino, T.; Masuda, T.; Honjo, S.; Mimura, T.; Kitoh, Y.; Noguchi, Y.

2010-06-01

167

Cable Tester Box  

NASA Technical Reports Server (NTRS)

Cables are very important electrical devices that carry power and signals across multiple instruments. Any fault in a cable can easily result in a catastrophic outcome. Therefore, verifying that all cables are built to spec is a very important part of Electrical Integration Procedures. Currently, there are two methods used in lab for verifying cable connectivity. (1) Using a Break-Out Box and an ohmmeter this method is time-consuming but effective for custom cables and (2) Commercial Automated Cable Tester Boxes this method is fast, but to test custom cables often requires pre-programmed configuration files, and cables used on spacecraft are often uniquely designed for specific purposes. The idea is to develop a semi-automatic continuity tester that reduces human effort in cable testing, speeds up the electrical integration process, and ensures system safety. The JPL-Cable Tester Box is developed to check every single possible electrical connection in a cable in parallel. This system indicates connectivity through LED (light emitting diode) circuits. Users can choose to test any pin/shell (test node) with a single push of a button, and any other nodes that are shorted to the test node, even if they are in the same connector, will light up with the test node. The JPL-Cable Tester Boxes offers the following advantages: 1. Easy to use: The architecture is simple enough that it only takes 5 minutes for anyone to learn how operate the Cable Tester Box. No pre-programming and calibration are required, since this box only checks continuity. 2. Fast: The cable tester box checks all the possible electrical connections in parallel at a push of a button. If a cable normally takes half an hour to test, using the Cable Tester Box will improve the speed to as little as 60 seconds to complete. 3. Versatile: Multiple cable tester boxes can be used together. As long as all the boxes share the same electrical potential, any number of connectors can be tested together.

Lee, Jason H.

2011-01-01

168

Evaluation of Abrupt Grounding as Quality Control Method for HVDC Extruded Cables  

Microsoft Academic Search

This paper presents results from laboratory experiments performed in order to evaluate different methods for quality control of polymeric insulated HVDC cables. In this work, we have investigated the effect of short term (24 h) DC stress followed by rapid grounding of the cable. This is comparable to a voltage step of -Usub0\\/sub at the point of grounding ,and depending

Frank Mauseth; Erling Ildstad; Rolf Hegerberg; Marc Jeroense; Bjørn Sanden; Jan Erik Larsen

2009-01-01

169

Testing of flat conductor cable to Underwriters Laboratory standards UL719 and UL83  

NASA Technical Reports Server (NTRS)

The flat conductor cable (FCC) which was tested consisted of three AWG No. 12 flat copper conductors laminated between two films of polyethylene terephthalate (Mylar) insulation with a self-extinguishing polyester adhesive. Results of the tests conducted on this cable, according to specifications, warrants the use of this FCC for electrical interconnections in a surface nonmetallic protective covering.

Loggins, R. W.; Herndon, R. H.

1974-01-01

170

HALAR fluoropolymer: A versatile insulation material  

NASA Technical Reports Server (NTRS)

Research directed toward developing materials for the wire and cable industry has resulted in a new product, E-CTFE copolymer, which has an outstanding combination of electrical, thermal, and mechanical properties. The properties of E-CTFE are discussed and compared with those of other commercial fluoropolymers. Particular attention is given to the utility of E-CTFE as a wire and cable insulation.

Robertson, A. B.

1972-01-01

171

The surface discharge and breakdown characteristics of HTS DC cable and stop joint box  

NASA Astrophysics Data System (ADS)

A high temperature superconducting (HTS) DC cable system consists of a HTS cable and cable joint. The HTS DC cable should be electrically connected in joint boxes because of the unit length of HTS cable is limited to several-hundred meters. In particular, the stop joint box (SJB) must be developed for a compact cooling system. Polypropylene laminated paper (PPLP) and epoxy maybe used as insulating materials for HTS DC cable and SJB. To develop a HTS DC cable, it is necessary to develop the cryogenic insulation technology, materials and the joint methods. In this paper, we will mainly discuss on the DC and impulse characteristics of epoxy and PPLP in liquid nitrogen (LN2). The surface discharge characteristics of epoxy included fillers, PPLP and epoxy with PPLP composite (epoxy + PPLP) were measured under 0.4 MPa. Also, the PPLP-insulated mini-model cable was fabricated and then DC, impulse and DC polarity reversal breakdown strength of mini-model cable under 0.4 MPa were investigated.

Kim, W. J.; Kim, H. J.; Cho, J. W.; Kim, S. H.

2014-09-01

172

Monolithic Silicon Probes with Flexible Parylene Cables for Neural Prostheses  

E-print Network

Monolithic Silicon Probes with Flexible Parylene Cables for Neural Prostheses Changlin Pang1-insulated silicon probes, which are used for neural prostheses to record high-level cognitive neural signals of inorganic materials (e.g. silicon dioxide, silicon nitride), the electrodes and conduction traces

Andersen, Richard

173

Unique ORNL HTS Program Capabilities ORNL cable test facility  

E-print Network

. In a real- world setting, severe stresses are imposed upon the dielectric insulation and the system is the only one in the U.S., is actively used in collaboration with U.S. superconducting wire and equipment for testing model cables, terminations, subassemblies, components and materials ; Cryogenic temperatures

174

Experimental results of a 30 m, 3-core HTSC cable  

NASA Astrophysics Data System (ADS)

A high temperature superconducting (HTSC) cable is expected to transport large electric power with a compact size because of its high critical current density. We have been developing a 3-core 66 kV class HTSC cable, which is applied to the ?150 mm duct, and is composed of a conductor and a shield wound with Ag-Mn sheathed Bi-2223 tapes, electrical insulation with polypropylene laminated paper impregnated with liquid nitrogen and thermal insulation with co-axial corrugated pipes. A 30 m, 3-core cable system has been constructed to verify the 3-core performance after its production, laying and cooling. The cable had good performance to mechanical stress in the factory process. The critical current of the cable was more than 2.4 kA at 77 K. The AC loss of the conductor part was 0.5 W/m/phase at 1 kA rms, which agreed well with the calculated value of the spiral pitch adjustment technique. A 130 kV rms AC was successfully applied without any change in tan ? and capacitance. As a next step, a 100 m HTSC cable has been designed and developed based on these experimental results.

Masuda, Takato; Kato, Takeshi; Yumura, Hiroyasu; Hirose, Masayuki; Isojima, Shigeki; Honjo, Shoichi; Matsuo, Kimiyoshi; Mimura, Tomoo; Takahashi, Yoshihisa

2002-08-01

175

Submarine cable route survey  

SciTech Connect

The growth of telecommunication market is very significant. From the beginning of the nineties, more and more the use of optical fiber submarine cables is privileged to that of satellites. These submarine telecommunication highways require accurate surveys in order to select the optimum route and determine the cable characteristics. Advanced technology tools used for these surveys are presented along with their implementation.

Herrouin, G.; Scuiller, T.

1995-12-31

176

DOCSISTM cable modem technology  

Microsoft Academic Search

An overview of the cable modem interface standard is presented. This standard is the foundation for high-speed access to content on the Internet being offend by North American cable operators. It also facilitates retail sales of modems and integration into computers, is being adopted by international operators, and provides a path for convergence of video, data, and voice services on

David Fellows; Doug Jones

2001-01-01

177

Multistrand superconductor cable  

DOEpatents

Improved multistrand Rutherford-type superconductor cable is produced by using strands which are preformed, prior to being wound into the cable, so that each strand has a variable cross section, with successive portions having a substantially round cross section, a transitional oval cross section, a rectangular cross section, a transitional oval cross section, a round cross section and so forth, in repetitive cycles along the length of the strand. The cable is wound and flattened so that the portions of rectangular cross section extend across the two flat sides of the cable at the strand angle. The portions of round cross section are bent at the edges of the flattened cable, so as to extend between the two flat sides. The rectangular portions of the strands slide easily over one another, so as to facilitate flexing and bending of the cable, while also minimizing the possibility of causing damage to the strands by such flexing or bending. Moreover, the improved cable substantially maintains its compactness and cross-sectional shape when the cable is flexed or bent.

Borden, Albert R. (El Cerrito, CA)

1985-01-01

178

Cable Television and Education.  

ERIC Educational Resources Information Center

Cable television can augment educational broadcast services and also provide a level of individualized educational services not possible with either broadcasting or classroom audiovisual aids. The extra channels provided by cable television allow the following extra services for education: 1) broadcast of a multitude of programs, including delayed…

Stern, Joseph L.

179

Lightning vulnerability of fiber-optic cables.  

SciTech Connect

One reason to use optical fibers to transmit data is for isolation from unintended electrical energy. Using fiber optics in an application where the fiber cable/system penetrates the aperture of a grounded enclosure serves two purposes: first, it allows for control signals to be transmitted where they are required, and second, the insulating properties of the fiber system help to electrically isolate the fiber terminations on the inside of the grounded enclosure. A fundamental question is whether fiber optic cables can allow electrical energy to pass through a grounded enclosure, with a lightning strike representing an extreme but very important case. A DC test bed capable of producing voltages up to 200 kV was used to characterize electrical properties of a variety of fiber optic cable samples. Leakage current in the samples were measured with a micro-Ammeter. In addition to the leakage current measurements, samples were also tested to DC voltage breakdown. After the fiber optic cables samples were tested with DC methods, they were tested under representative lightning conditions at the Sandia Lightning Simulator (SLS). Simulated lightning currents of 30 kA and 200 kA were selected for this test series. This paper documents measurement methods and test results for DC high voltage and simulated lightning tests performed at the Sandia Lightning Simulator on fiber optic cables. The tests performed at the SLS evaluated whether electrical energy can be conducted inside or along the surface of a fiber optic cable into a grounded enclosure under representative lightning conditions.

Martinez, Leonard E.; Caldwell, Michele

2008-06-01

180

Telecommunications: Coaxial Cables  

NSDL National Science Digital Library

Provided by Wisc-Online and the National Science Foundation, this website provides a plethora of information on coaxial cables including what an RG rating is, what a code is, and how each type of cable is used. This interactive slideshow goes into greater detail about an RG-8, 10Base5 cable and an RG-58, 10Base2 cable. There are helpful animations and clear descriptions covering the basics of coaxial cables. To wrap it all up, there are review questions to test the learnerâÂÂs knowledge on what they were just presented. All in all, it is a great resource for students (or for teachers to present to their students) who are learning the nuts and bolts of telecommunications.

Bartelt, Terry L.

2009-10-08

181

The Great Transatlantic Cable  

NSDL National Science Digital Library

In the modern era of instantaneous communication, it is perhaps difficult to imagine a world only 130 years ago where sending messages and other items to Europe was a rather time-consuming affair. Transatlantic communications were vastly improved when Cyrus Field, a New York paper manufacturer, completed construction of a 2,000-mile-long cable beneath the Atlantic in 1866. This delightful website is designed to complement the American Experience documentary on the construction of the cable, and will be of great interest to those with a penchant for the history of technology. Visitors can learn about the laborious process involved with the construction of the cable, take part in an online poll, and learn about the science behind the transatlantic cable. Additional materials include a detailed timeline of related events, additional interviews with experts in the field, and a selection of cable-related humor from the period.

182

Verification tests of a 66 kV HTSC cable system for practical use (first cooling tests)  

NASA Astrophysics Data System (ADS)

Tokyo Electric Power Company and Sumitomo Electric Industries, Ltd. have been jointly developing elementary technologies for an high temperature superconducting (HTSC) cable system, such as conductor wound with HTSC wires, thermal insulation pipes, terminations and so on. Verification tests of a 100 m HTSC cable system integrating these elementary technologies have been conducted in collaboration with Central Research Institute of Electric Power Industry (CRIEPI) to verify its long term electric and cryogenic properties. The cable conductor is composed of four layers of Bi-2223 wires wound spirally around a former. Polypropylene laminated paper impregnated with liquid nitrogen is adopted as cable insulation for its properties of high insulation strength and low dielectric loss. HTSC wires are also wound around the electrical insulation to form an electrical and magnetic shield. To reduce heat invasion from ambient temperature part, multi-layer insulation is wound between the co-axial stainless corrugated pipes where high vacuum is maintained. The cable was partially installed into a ? 150 mm duct and formed in a U-shape. Each end has a splitter box and three terminations. The cable and the terminations are cooled using two separate sets of a pressurized and sub-cooled liquid nitrogen cooling system. The cable has been developed and laid at CRIEPI's test site and long-term tests have been under way since June, 2001. This paper presents the design of the cable and some results of the first cooling tests.

Masuda, T.; Kato, T.; Yumura, H.; Watanabe, M.; Ashibe, Y.; Ohkura, K.; Suzawa, C.; Hirose, M.; Isojima, S.; Matsuo, K.; Honjo, S.; Mimura, T.; Kuramochi, T.; Takahashi, Y.; Suzuki, H.; Okamoto, T.

2002-10-01

183

Cable and Line Inspection Mechanism  

NASA Technical Reports Server (NTRS)

An automated cable and line inspection mechanism visually scans the entire surface of a cable as the mechanism travels along the cable=s length. The mechanism includes a drive system, a video camera, a mirror assembly for providing the camera with a 360 degree view of the cable, and a laser micrometer for measuring the cable=s diameter. The drive system includes an electric motor and a plurality of drive wheels and tension wheels for engaging the cable or line to be inspected, and driving the mechanism along the cable. The mirror assembly includes mirrors that are positioned to project multiple images of the cable on the camera lens, each of which is of a different portion of the cable. A data transceiver and a video transmitter are preferably employed for transmission of video images, data and commands between the mechanism and a remote control station.

Ross, Terence J. (Inventor)

2003-01-01

184

Cable and line inspection mechanism  

NASA Technical Reports Server (NTRS)

An automated cable and line inspection mechanism visually scans the entire surface of a cable as the mechanism travels along the cable=s length. The mechanism includes a drive system, a video camera, a mirror assembly for providing the camera with a 360 degree view of the cable, and a laser micrometer for measuring the cable=s diameter. The drive system includes an electric motor and a plurality of drive wheels and tension wheels for engaging the cable or line to be inspected, and driving the mechanism along the cable. The mirror assembly includes mirrors that are positioned to project multiple images of the cable on the camera lens, each of which is of a different portion of the cable. A data transceiver and a video transmitter are preferably employed for transmission of video images, data and commands between the mechanism and a remote control station.

Ross, Terence J. (Inventor)

2003-01-01

185

Instability in kiloamp class a.c. superconducting cables  

NASA Astrophysics Data System (ADS)

In kiloamp (kA) class superconducting cables for a.c. use, where each strand does not have an insulation layer, the quench current in 60 Hz operation was found to be no more than 50% of the d.c. critical current, even on the load line. The degradation in the 60 Hz quench current of the kA class cables is discussed with respect to: 1, an a.c. instability in the multifilamentary wire; 2, magnetic coupling among strands in concentric multistrand cables; 3, the influence of local disorder in cabling on current distribution; and 4, the temperature rise due to steady a.c. losses. While points 2 and 3 induce non-uniform current distribution, points 1 and 4 were found to be factors in the reduction of quench current in the strands with higher current density. Some local overheatings may also contribute to the intense degradation.

Funaki, K.; Nakashima, M.; Iwakuma, M.; Takeo, M.; Yamafuji, K.

186

Status of 275 kV REBCO HTS Cable Development in the NEDO Project  

NASA Astrophysics Data System (ADS)

A 275 kV 3 kA high temperature superconducting cable (HTS cable), which could be used as a backbone power line in the future, was developed in the NEDO project called M-PACC. One of the most important developments of a high voltage HTS cable was the high voltage insulation technology. A design guideline and a test specification that was necessary to design, product and demonstrate of a 275 kV, 3 kA HTS cable have been studied by obtaining the various experimental data such as AC withstand voltage, impulse withstand voltage, partial discharge inception stress, and the V-t characteristics of the insulation, on the basis of the Japan Electrical Standards (JEC) and the International Electrotechnical Commission (IEC). Moreover, the 275 kV, 3 kA HTS cable with a length of 30 m was demonstrated under a long-term voltage and current loading test.

Mukoyama, Shinichi; Yagi, Masashi; Okuma, Takeshi; Maruyama, Osamu; Shiohara, Yuu; Hayakawa, Naoki; Mizutani, Teruyoshi

187

Correction coil cable  

DOEpatents

A wire cable assembly adapted for the winding of electrical coils is taught. A primary intended use is for use in particle tube assemblies for the Superconducting Super Collider. The correction coil cables have wires collected in wire array with a center rib sandwiched therebetween to form a core assembly. The core assembly is surrounded by an assembly housing having an inner spiral wrap and a counter wound outer spiral wrap. An alternate embodiment of the invention is rolled into a keystoned shape to improve radial alignment of the correction coil cable on a particle tube in a particle tube assembly. 7 figs.

Wang, S.T.

1994-11-01

188

Electrical Model of Balanced AC HTS Power Cable  

NASA Astrophysics Data System (ADS)

The future electricity grid will be more sustainable and it will have more power transmission and distribution capability with more electrical power added from decentralized sources on distribution level and from wind parks and other large sources on transmission level. More interconnections and more underground transmission and distribution will be put up. Use of high temperature superconducting (HTS) power cables provides solutions to many of the future grid problems caused by these trends. In this paper we present an electrical model of a balanced 6 km-long three phase triaxial HTS power cable for the Dutch project being developed by a consortium of Alliander, Ultera™ and TUD. The cable currents in all three phases are balanced by selecting proper twist pitches and insulation thickness. The paper focuses on determining inductances, capacitances and AC losses of the balanced cable. Using the developed model, we also determine the voltage drop as function of the cable length, the neutral current and the effect of the imbalanced capacitances on the current distribution of the Dutch distribution cable. The model is validated and it can be used for accurate simulation of the electrical behaviour of triaxial HTS cables in electrical grids.

Zuijderduin, R.; Chevtchenko, O.; Smit, J. J.; Willén, D.; Melnik, I.; Geschiere, A.

189

Insulation Station  

NSDL National Science Digital Library

In this physical sciences activity, learners explore insulation. Leaners investigate how insulation can be used to slow down the conduction of heat from one side of a wall to the other. Learners are challenged with designing the best way to insulate a cup to prevent ice cubes from melting.

Television, Twin C.

2013-01-01

190

Cable Television; A Bibliographic Review.  

ERIC Educational Resources Information Center

This bibliographic review of publications in the field of cable television begins with an introduction to cable television and an outline of the history and development of cable television. Particular attention is given to the regulatory activities of the Federal Communications Commission and the unfulfilled potential of cable television. The…

Schoenung, James

191

CISCO MULTISERVICE BROADBAND CABLE GUIDE  

E-print Network

CISCO MULTISERVICE BROADBAND CABLE GUIDE FALL 2004 AVAILABLE ON CD-ROM AND THE WORLD WIDE WEB #12;i TABLEOFCONTENTS Table of Contents Preface Cisco Multiservice Broadband Cable Guide .......................................................................................................................ix C H A P T E R 1 Next-Generation Cable IP Network Cisco Cable Offering

Westall, James M.

192

Qualification High Voltage Testing of Short Triax HTS Cables in the Laboratory  

SciTech Connect

In order to qualify the electrical insulation design of future HTS cables installed in the electric grid, a number of high voltage qualification tests are generally performed in the laboratory on either single-phase model cables and/or actual three-phase cable samples. Prior to installation of the 200-m Triax HTS cable at the American Electric Power Bixby substation near Columbus, Ohio, in September, 2006, such tests were conducted on both single-phase model cables made at ORNL and tri-axial cable sections cut off from cable made on a production run. The three-phase tri-axial design provides some specific testing challenges since the ground shield and three phases are concentric about a central former with each phase separated by dielectric tape insulation immersed in liquid nitrogen. The samples were successfully tested and qualified for partial discharge inception, AC withstand, and lightning impulse where voltage is applied to one phase with the other phases grounded. In addition one of the phase pairs was tested for dc withstand as a ldquoworst caserdquo scenario to simulate the effect of VLF (Very Low Frequency) tests on the actual cable installed at the Bixby site. The model and prototype cables will be described and the high voltage test results summarized.

James, David Randy [ORNL; Sauers, Isidor [ORNL; Ellis, Alvin R [ORNL; Tuncer, Enis [ORNL; Gouge, Michael J [ORNL; Demko, Jonathan A [ORNL; Duckworth, Robert C [ORNL; Rey, Christopher M [ORNL

2009-01-01

193

Shape memory alloy cables  

NASA Astrophysics Data System (ADS)

Conventional structural cables (or wire ropes) are composed of steel wires helically wound into strands, which, in turn, are wound around a core. Cables made from shape memory alloy (SMA) wires are a new structural element with promising properties for a broad range of new applications. Among the many potential advantages of this form are increased bending flexibility for spooling/packaging, better fatigue performance, energy absorption and damping, reduced thermal lag, redundancy, and signicant design flexibility. Currently there are no known studies of SMA cables in the literature, so exploratory thermo-mechanical experiments were performed on two commercially available cable designs as part of an ongoing research program to systematically characterize their thermomechanical behavior and demonstrate their potential utility as adaptive or resilient tension elements.

Reedlunn, Benjamin; Shaw, John A.

2008-03-01

194

The Discrete Hanging Cable  

ERIC Educational Resources Information Center

Using the methods of finite difference equations the discrete analogue of the parabolic and catenary cable are analysed. The fibonacci numbers and the golden ratio arise in the treatment of the catenary.

Peters, James V.

2004-01-01

195

77 FR 19525 - Specification for 15 kV and 25 kV Primary Underground Power Cable  

Federal Register 2010, 2011, 2012, 2013

...Cable rated voltage Nominal thickness Minimum thickness Maximum thickness...shall be subjected to a voltage stress of 250 volts...sample shall support this voltage stress, and not show...the insulation for a minimum of 100 hours. The...

2012-04-02

196

Electrical evaluation of the AC losses in a BSCCO cable with an HTS shield  

NASA Astrophysics Data System (ADS)

In general, a high temperature superconductor (HTS) cable has a conductor and a shield encircling it. This structure causes electrical evaluation of AC loss in the HTS cable to be very difficult. Thus it is not clear yet. Using two voltage leads attached to the conductor and shield, respectively, we evaluated not only their AC loss but also the cable’s total loss. To experimentally elucidate our electrical evaluation presented in this work, first we measured the total loss of the 100 m/22.9 kV BSCCO cable by calorimetry, especially around 77 K. Besides the same 5 m cable sample as above, another cable model with a thin insulator was also tested electrically, and they were compared with two numerical models: a non-twisted polygon model and a twisted cylinder model. The results show that, according to the insulator thickness between a conductor and a shield, their magnetic interaction becomes very different. For the 100 and 5 m cables, their normalized total AC losses measured from calorimetry and electrical evaluation correspond well to each other, regardless of operating temperatures. Moreover, the numerical analysis shows that the total AC losses measured for the 5 m sample and cable model fit with the numerically calculated ones. Besides, the conductor’s AC losses measured for both the cables agree well with the numerical ones, regardless of their insulator thickness. This is because a conductor in an actual cable is inside a shield, and so does not receive any effect of the shield’s magnetic field. These experimental and theoretical results support the view that our electrical evaluation for the total and conductor losses is reliable. However, unlike the results for the total and conductor losses, the shield’s experimental loss is not in good agreement with any of the theoretical ones from either the non-twisted polygon model or the twisted cylinder model.

Ryu, K.; Li, Z. Y.; Hwang, S. D.

2014-02-01

197

New developments in cable TV networks: data over cable services and PacketCable  

Microsoft Academic Search

Cable television networks today are seeing many positive industry advancements. This paper profiles some of the newest technologies and changes that we can expect to see in cable television networks over the upcoming years. Two major advancements taking place are the DOCSIS platform and PacketCable specification. Residential cable subscribers are being offered more and more services everyday and can expect

C. Pawlowski; S. Song

2005-01-01

198

Reusable Hot-Wire Cable Cutter  

NASA Technical Reports Server (NTRS)

During the early development stage of balloon deployment systems for missions, nichrome wire cable cutters were often used in place of pyro-actuated cutters. Typically, a nichrome wire is wrapped around a bundle of polymer cables with a low melting point and connected to a relay-actuated electric circuit. The heat from the nichrome reduces the strength of the cable bundle, which quickly breaks under a mechanical load and can thus be used as a release mechanism for a deployment system. However, the use of hand-made heated nichrome wire for cutters is not very reliable. Often, the wrapped nichrome wire does not cut through the cable because it either pulls away from its power source or does not stay in contact with the cable being cut. Because nichrome is not readily soldered to copper wire, unreliable mechanical crimps are often made to connect the nichrome to an electric circuit. A self-contained device that is reusable and reliable was developed to sever cables for device release or deployment. The nichrome wire in this new device is housed within an enclosure to prevent it from being damaged by handling. The electric power leads are internally connected within the unit to the nichrome wire using a screw terminal connection. A bayonet plug, a quick and secure method of connecting the cutter to the power source, is used to connect the cutter to the power leads similar to those used in pyro-cutter devices. A small ceramic tube [0.25-in. wide 0.5-in. long (.6.4-mm wide 13-mm long)] houses a spiraled nichrome wire that is heated when a cable release action is required. The wire is formed into a spiral coil by wrapping it around a mandrel. It is then laid inside the ceramic tube so that it fits closely to the inner surface of the tube. The ceramic tube provides some thermal and electrical insulation so that most of the heat generated by the wire is directed toward the cable bundle in the center of the spiral. The ceramic tube is cemented into an aluminum block, which holds it in position. The leads of the nichrome wire are attached to screw terminals that connect them to power leads. A bayonet plug mounted at the bottom of the rectangular block connects the power leads to a relay circuit. A thin aluminum shell encloses the entire structure, leaving access points to attach to the bayonet plug and to feed a cable into the cylinder. The access holes for the deployment cable are a smaller diameter than the nichrome coil to prevent the cable from coming in direct contact with the nichrome when loaded. It uses the same general method of severing a cable with a heated wire as was used previously, but implements it in such a way that it is more reliable and less prone to failure. It creates a mechanism to create repeatability that was nonexistent in the previous method.

Pauken, Michael T.; Steinkraus, Joel M.

2010-01-01

199

Study and analysis of field enhancement and H.V rating of power cables containing micro cavities  

Microsoft Academic Search

Partial discharge (P.D.) in micro cavities in the insulation of H.V. power cables drastically affect the performance, the field distribution and hence the rating of these cables. It is well known that, P.D. deteriorates power cables and lead to its complete failure. This has adverse effects on the reliability and maintainability of power supply, which affects directly the production of

A. A. Hossam-Eldin; S. S. Dessouky; S. M. El-Mekkawy

2007-01-01

200

Density measurements as a condition monitoring approach for following the aging of nuclear power plant cable materials  

Microsoft Academic Search

Monitoring changes in material density has been suggested as a potentially useful condition monitoring (CM) method for following the aging of cable jacket and insulation materials in nuclear power plants. In this study, we compare density measurements and ultimate tensile elongation results versus aging time for most of the important generic types of commercial nuclear power plant cable materials. Aging

K. T. Gillen; M. Celina; R. L. Clough

1999-01-01

201

Experimental investigations of overvoltages in 6 kV station service cable networks of thermal power plants  

Microsoft Academic Search

The paper presents the results of experimental investigations of overvoltages on 6 kV isolated neutral station service cable networks of thermal power plants. On the basis of these investigations, certain measures are proposed for limiting overvoltages and for the reliability of station service of thermal power plants. The cables are shielded and have three leads with cross-linked insulation. The shield

Petar I. Vukelja; Radomir M. Naumov; Goran V. Drobnjak; Jovan D. MrviC

1996-01-01

202

SSME Electrical Harness and Cable Development and Evolution  

NASA Technical Reports Server (NTRS)

The Space Shuttle Main Engine (SSME) electrical harness and cable system consists of the various interconnecting devices necessary for operation of complex rocket engine functions. Thirty seven harnesses incorporate unique connectors, backshell adapters, conductors, insulation, shielding, and physical barriers for a long maintenance-free life while providing the means to satisfy performance requirements and to mitigate adverse environmental influences. The objective of this paper is to provide a description of the SSME electrical harness and cable designs as well as the development history and lessons learned.

Abrams, Russ; Heflin, Johnny; Burns, Bob; Camper, Scott J.; Hill, Arthur J.

2010-01-01

203

Cable-Dispensing Cart  

NASA Technical Reports Server (NTRS)

A versatile cable-dispensing cart can support as many as a few dozen reels of cable, wire, and/or rope. The cart can be adjusted to accommodate reels of various diameters and widths, and can be expanded, contracted, or otherwise reconfigured by use of easily installable and removable parts that can be carried onboard. Among these parts are dispensing rods and a cable guide that enables dispensing of cables without affecting the direction of pull. Individual reels can be mounted on or removed from the cart without affecting the other reels: this feature facilitates the replacement or reuse of partially depleted reels, thereby helping to reduce waste. Multiple cables, wires, or ropes can be dispensed simultaneously. For maneuverability, the cart is mounted on three wheels. Once it has been positioned, the cart is supported by rubber mounts for stability and for prevention of sliding or rolling during dispensing operations. The stability and safety of the cart are enhanced by a low-center-of-gravity design. The cart can readily be disassembled into smaller units for storage or shipping, then reassembled in the desired configuration at a job site.

Bredberg, Alan S.

2003-01-01

204

Cellulose Insulation  

NASA Technical Reports Server (NTRS)

Fire retardant cellulose insulation is produced by shredding old newspapers and treating them with a combination of chemicals. Insulating material is blown into walls and attics to form a fiber layer which blocks the flow of air. All-Weather Insulation's founders asked NASA/UK-TAP to help. They wanted to know what chemicals added to newspaper would produce an insulating material capable of meeting federal specifications. TAP researched the query and furnished extensive information. The information contributed to successful development of the product and helped launch a small business enterprise which is now growing rapidly.

1980-01-01

205

Thermal insulator  

SciTech Connect

A thermal insulator comprises an expanded resin body having embedded therein an evacuated powder insulation portion which consists of fine powder and a container of film-like plastics or a film-like composite of plastics and metal for enclosing the powder. The resin body has been expanded by a Freon gas as a blowing agent. Since a Freon gas has a larger molecular diameter than the constituent gases of air, it is less likely to permeate through the container than air. Thus present invention provides a novel composite insulator which fully utilizes the benefits of vacuum insulation without necessitating a strong and costly material for a vacuum container.

Yamamoto, R.; Asada, Y.; Matsuo, Y.; Mikoda, M.

1985-07-16

206

Design and Evaluation of 275 kV-3 kA HTS Power Cable  

NASA Astrophysics Data System (ADS)

A 275 kV 3 kA high temperature superconducting (HTS) cable has been developed in the Materials & Power Applications of Coated Conductors (M-PACC) project. The cable is expected to be put to practical use as the backbone power line in the future because the capacity of 1.5 GW is about the same as overhead transmission lines. The 30 m cable has been designed on the basis of design values that had been obtained by various voltage tests, AC loss measurement tests, short circuit tests, and other elementary tests. Cable insulation was determined by the design stresses and test conditions based on IEC, JEC (Japan electrical standards), and other HTS demonstrations. This cable was also designed to withstand the short circuit test of 63 kA for 0.6 seconds and to have low losses, including AC loss and dielectric loss of 0.8 W/m at 3kA, 275 kV. Based on the design, a 30 m cable was manufactured, and short samples during this manufacturing process were confirmed to have the designed characteristics. Furukawa Electric prepared a demonstration of the 30 m cable with two terminations and a cable joint. The long-term test under a current of 3 kA, and test voltage determined from 30 years of insulation degradation has been conducted since November 2012 at Shenyang in China.

Yagi, M.; Mukoyama, S.; Mitsuhashi, T.; Jun, T.; Liu, J.; Nakayama, R.; Hayakawa, N.; Wang, X.; Ishiyama, A.; Amemiya, N.; Hasegawa, T.; Saitoh, T.; Ohkuma, T.; Maruyama, O.

207

Correction coil cable  

DOEpatents

A wire cable assembly (10, 310) adapted for the winding of electrical coils is taught. A primary intended use is for use in particle tube assemblies (532) for the superconducting super collider. The correction coil cables (10, 310) have wires (14, 314) collected in wire arrays (12, 312) with a center rib (16, 316) sandwiched therebetween to form a core assembly (18, 318 ). The core assembly (18, 318) is surrounded by an assembly housing (20, 320) having an inner spiral wrap (22, 322) and a counter wound outer spiral wrap (24, 324). An alternate embodiment (410) of the invention is rolled into a keystoned shape to improve radial alignment of the correction coil cable (410) on a particle tube (733) in a particle tube assembly (732).

Wang, Sou-Tien (Danville, CA)

1994-11-01

208

High acceleration cable deployment system  

NASA Technical Reports Server (NTRS)

A deployment system that will safely pay one cable from a ballistic forebody when the forebody is separated from an afterbody (to which the cable is secured and when the separation is marked by high acceleration and velocity) is described.

Canning, T. N.; Barns, C. E.; Murphy, J. P.; Gin, B.; King, R. W. (inventors)

1981-01-01

209

The effect of temperature and the mutual influence between two cavities on the appearance of partial discharges in gaseous cavities contained in the insulator of high voltage  

Microsoft Academic Search

Our work treats the effect of the temperature on the appearance of partial discharges in high voltage cables. We modelize the heterogeneous insulator of the cable using finite difference method. The numerical treatment is carried out in bidimensional due to the observed symmetry in the cavities. We simulate regions of weak concentration to an insulator containing one cavity, this is

T. Seghir; D. Mahi; A. Nouar; K. Lefkaier

2004-01-01

210

The effect of temperature and the mutual influence between two cavities of on the appearance of partial discharges in gaseous cavities contained in the insulator of high voltage  

Microsoft Academic Search

Our work treat the effect of the temperature on the appearance of partial discharges in high voltage cables. We modelize the heterogeneous insulator of the cable using finite difference method. The numerical treatment is carried out in bidimensional due to the observed symmetry in the cavities. We simulate regions of weak concentration to an insulator containing one cavity, this is

T. Seghir; D. Mahi; A. Nouar; K. Lefkaier

2003-01-01

211

USING CONDITION MONITORING TO PREDICT REMAINING LIFE OF ELECTRIC CABLES.  

SciTech Connect

Electric cables are passive components used extensively throughout nuclear power stations to perform numerous safety and non-safety functions. It is known that the polymers commonly used to insulate the conductors on these cables can degrade with time; the rate of degradation being dependent on the severity of the conditions in which the cables operate. Cables do not receive routine maintenance and, since it can be very costly, they are not replaced on a regular basis. Therefore, to ensure their continued functional performance, it would be beneficial if condition monitoring techniques could be used to estimate the remaining useful life of these components. A great deal of research has been performed on various condition monitoring techniques for use on electric cables. In a research program sponsored by the U.S. Nuclear Regulatory Commission, several promising techniques were evaluated and found to provide trendable information on the condition of low-voltage electric cables. These techniques may be useful for predicting remaining life if well defined limiting values for the aging properties being measured can be determined. However, each technique has advantages and limitations that must be addressed in order to use it effectively, and the necessary limiting values are not always easy to obtain. This paper discusses how condition monitoring measurements can be used to predict the remaining useful life of electric cables. The attributes of an appropriate condition monitoring technique are presented, and the process to be used in estimating the remaining useful life of a cable is discussed along with the difficulties that must be addressed.

LOFARO,R.; SOO,P.; VILLARAN,M.; GROVE,E.

2001-03-29

212

Underwater robots for cable following  

Microsoft Academic Search

A sensor fusion technique is proposed for autonomous underwater vehicles (AUVs) to track underwater cables. The focus of this paper is to solve the two practical problems encountered in optical vision based systems in underwater environments: (1) navigation of AUV when cable is invisible in the image; and (2) selection of the correct cable when there are many similar features

Arjuna Balasuriya; Tarnab Ura

2001-01-01

213

High Temperature Superconducting Underground Cable  

SciTech Connect

The purpose of this Project was to design, build, install and demonstrate the technical feasibility of an underground high temperature superconducting (HTS) power cable installed between two utility substations. In the first phase two HTS cables, 320 m and 30 m in length, were constructed using 1st generation BSCCO wire. The two 34.5 kV, 800 Arms, 48 MVA sections were connected together using a superconducting joint in an underground vault. In the second phase the 30 m BSCCO cable was replaced by one constructed with 2nd generation YBCO wire. 2nd generation wire is needed for commercialization because of inherent cost and performance benefits. Primary objectives of the Project were to build and operate an HTS cable system which demonstrates significant progress towards commercial progress and addresses real world utility concerns such as installation, maintenance, reliability and compatibility with the existing grid. Four key technical areas addressed were the HTS cable and terminations (where the cable connects to the grid), cryogenic refrigeration system, underground cable-to-cable joint (needed for replacement of cable sections) and cost-effective 2nd generation HTS wire. This was the world’s first installation and operation of an HTS cable underground, between two utility substations as well as the first to demonstrate a cable-to-cable joint, remote monitoring system and 2nd generation HTS.

Farrell, Roger, A.

2010-02-28

214

SHOPPING GENIE Ethernet cables must  

E-print Network

. An Ethernet cable is needed for best connec- tion and speed in the resi- dence halls. There is ONE high-speedSHOPPING GENIE Ethernet cables must be at least CAT-5 and have RJ-45 con- nectors. The average such as Radio Shack, & Best Buy also carry Ethernet cables. A COMPUTER & PRINTER. Most stu- dents bring both

Cantlon, Jessica F.

215

EMP coupling to shielded cables  

NASA Astrophysics Data System (ADS)

Electromagnetic coupling to shielded cables is analyzed in terms of two electromagnetically coupled transmission lines excited by distributed sources. This analysis results in two traveling waves on the shield and four traveling waves in the core of the cable. Transient waveforms are reported from EMP coupling on an overhead RG-58 cable.

Agouridis, D. C.

216

Cables and connectors: A compilation  

NASA Technical Reports Server (NTRS)

A technological compilation on devices and techniques for various types of electrical cables and connections is presented. Data are reported under three sections: flat conductor cable technology, newly developed electrical connectors, and miscellaneous articles and information on cables and connector techniques.

1974-01-01

217

Coupling losses in flat cables and coated conductors  

NASA Astrophysics Data System (ADS)

After giving all known contributions to coupling losses in superconducting flat structures with twisted filaments, we argue that in some structures the contribution, caused by the induced currents between filaments or striations on the same side of a flat cable or tape, generally cannot be neglected in calculating the total coupling losses. This contribution was not considered in previous calculations. As was demonstrated recently, this type of contribution can be decisive in determining the coupling losses for flat cables with well-conducting edge layers. We show that an analogous contribution should determine the coupling losses for flat cables with a central insulating layer and also for coated conductors with stripes or striations. In addition, it can restrict the maximum allowable twist pitch of superconductors with reliable loss generation and electromagnetic stability.

Takács, S.

2006-08-01

218

Cable Television Information.  

ERIC Educational Resources Information Center

Cable television for the State of New York is discussed in detail with relation to: (1) the regents of the University of the State of New York, (2) legislation, (3) planning and proposals for franchises, (4) the Federal Communications Commission, (5) access rules, (6) a list of companies and those serving schools, and (7) federal/state/local…

New York State Education Dept. , Albany. Bureau of Mass Communications.

219

Fiber Optic Submarine Cables  

NASA Astrophysics Data System (ADS)

Submarine communication cables have one of the longest history in the field of technics. During the last 20 years their importance showed a drastic decay in favour of satellites. Presently their future looks bright again as they contain now optical fibers instead of coaxial pairs.

Oestreich, Ulrich H. P.

1990-01-01

220

Flat conductor cable applications  

NASA Technical Reports Server (NTRS)

Some of the numerous applications of flat conductor cable (FCC) systems are briefly described. Both government and commercial uses were considered, with applications designated as either aerospace, military, or commercial. The number and variety of ways in which FCC is being applied and considered for future designs are illustrated.

Angele, W.

1972-01-01

221

Cable in Mass 2.  

ERIC Educational Resources Information Center

The current (1972) status of cable television (CATV) in Massachusetts is reviewed in this guide. The tone of the guide is oriented toward more citizen participation and public access to CATV operations throughout the state. The legal and technical CATV considerations are briefly discussed. Short illustrated chapters on the possibilities of local…

Founders Annex Public Service Project, Inc., Dedham, MA.

222

Pediatrics and Cable Television.  

ERIC Educational Resources Information Center

The Department of Community Medicine of the Mount Sinai School of Medicine (New York City), in cooperation with the TelePrompTer Corporation and with funding from the Health Services and Mental Health Administration of the Department of Health, Education, and Welfare, has developed a bidirectional television system using coaxial cable which links…

Wallerstein, Edward; And Others

223

Urban Cable Systems.  

ERIC Educational Resources Information Center

Analysis of demographic, social, municipal and commercial characteristics of Washington, D.C., indicate that a sophisticated three-stage cable television (CATV) system could be economically viable. The first stage would provide one-way CATV service offering 30 video channels and local program origination at a monthly fee of $3.50. The second stage…

Mason, William F.; And Others

224

Handbook for photovoltaic cabling  

SciTech Connect

This volume, originally written as part of the Interim Performance Criteria Document Development Implementation Plan and Procedures for Photovoltaic Energy Systems, is an analysis of the several factors to be considered in selecting cabling for photovoltaic purposes. These factors, correspoonding to chapter titles, are electrical, structural, safety, durability/reliability, and installation. A glossary of terms used within the volume is included for reference.

Klein, D. N.

1980-08-01

225

Multilayer flat electrical cable  

NASA Technical Reports Server (NTRS)

Flat electrical cable is lightweight, flexible over wide temperature range, withstands continuous exposure to high levels of nuclear radiation, and can carry high currents with minimum of temperature rise. Its magnetic cleanliness is equal to or better than twisted pair of wires, and it can be terminated in conventional electrical connector.

Silverman, P. G.

1973-01-01

226

High Temperature Superconducting Cable  

E-print Network

· Introduction (David Lindsay, Southwire) ­ Overall SPI Goals & Objectives ­ Design Approach ­ Review FY 2003 and reliabilities. · SPI-2: Bixby Substation, AEP, Columbus, OH ­To complete a long length demonstration with AEP · Install 13.2 kV, 3.0 kA (69 MVA) HTS cable system in Bixby substation, about 2 times the power

227

Cable Pool - Cherryfield  

USGS Multimedia Gallery

The USGS monitors the Narraguagus River at Cherryfield, Maine at a location called Cable Pool. This spot was once renowned for Atlantic salmon, where anglers would line the banks, waiting their turn to cast a line into the water. In fact, posts along the river bank to hold the waiting anglers rods e...

228

Flat conductor cable handbook  

NASA Technical Reports Server (NTRS)

Handbook includes discussion of FCC advantages, status of FCC regarding military specifications, hardware availability, and existing applications, descriptions and data on available cable, connectors, fasteners and hardware, design techniques and applications, wiring, manufacturing and installation techniques - and inspection and test procedures.

Angele, W.; Hankins, J. D.

1971-01-01

229

Development of important elementary technologies for a 66 kV-class three-phase HTS power cable  

NASA Astrophysics Data System (ADS)

High Tc superconducting (HTS) cables are expected to serve as underground power lines supplying electrical power to densely populated cities in the future. TEPCO and Furukawa have developed compact HTS cables that can replace the old cables in their existing ducts under metropolitan Tokyo. To connect HTS cables with actual electrical networks requires confirmation of long-term reliability of the electrical insulation and the ability to withstand accidents caused by short circuit. This report gives the results of our examination of these problems.

Mukoyama, S.; Yagi, M.; Tanaka, S.; Matsuo, K.; Honjo, S.; Mimura, T.; Aiba, T.; Takahashi, Y.

2002-10-01

230

Disposable telemetry cable deployment system  

DOEpatents

A disposable telemetry cable deployment system for facilitating information retrieval while drilling a well includes a cable spool adapted for insertion into a drill string and an unarmored fiber optic cable spooled onto the spool cable and having a downhole end and a stinger end. Connected to the cable spool is a rigid stinger which extends through a kelly of the drilling apparatus. A data transmission device for transmitting data to a data acquisition system is disposed either within or on the upper end of the rigid stinger.

Holcomb, David Joseph (Sandia Park, NM)

2000-01-01

231

Flat conductor cable commercialization project  

NASA Technical Reports Server (NTRS)

An undercarpet flat conductor cable and a baseboard flat conductor cable system were studied for commercialization. The undercarpet system is designed for use in office and commercial buildings. It employs a flat power cable, protected by a grounded metal shield, that terminates in receptacles mounted on the floor. It is designed to interface with a flat conductor cable telephone system. The baseboard system consists of a flat power cable mounted in a plastic raceway; both the raceway and the receptacles are mounted on the surface of the baseboard. It is designed primarily for use in residential buildings, particularly for renovation and concrete and masonry construction.

Hogarth, P.; Wadsworth, E.

1977-01-01

232

HVDC submarine power cables systems state of the art and future developments  

SciTech Connect

The paper begins with an introduction on the reasons that lead to the use of HVDC submarine cable links. The main aspects for the choice of direct current are presented as well as the advantages deriving from the utilization of submarine cables. The second part is dedicated to a discussion on the various type of insulation that could be used in power cables and their possible application to HVDC submarine cables. In the following there is a description of the main characteristics and technical details of some particular project that at present time (1995) are in progress. Two projects are briefly presented: Spain-Morocco, a 26 km long interconnection for the transmission, in a first phase, of 700 MW from Spain to Morocco at 400 kV a.c. by means of three cables, plus one spare, of the fluid filled type. The cables are designed for a future change to d.c. 450 kV, allowing a transmission of 500 MW each (i.e., 2 GW total). One of the peculiarities of the link is the maximum water depth of 615 m (world record for submarine power cables at the time of installation). Italy-Greece, a 1km long interconnection for the transmission of 500 MW (bi-directional) by means of one paper insulated mass impregnated cable having 1,250 sq mm conductor size and insulated for a rated voltage of 400 kV. This link (the installation of which will be posterior to the Spain-Morocco) will attain the world record for the maximum water depth for submarine power cables: 1,000 m. The last part deals with the future developments expected in this field, in terms of conductor size and voltage, that means an increase in transmissible capacity.

Valenza, D.; Cipollini, G. [Pirelli Cavi S.p.A., Milano (Italy)

1995-12-31

233

San Francisco Cable Car Museum  

NSDL National Science Digital Library

Celebrated in American film, song, and popular legend, the San Francisco cable car gets its full due on this well honed site devoted to the history and operation of this cherished form of transportation. Beginning with a virtual tour of the Cable Car Museum, the site contains a full roster of current San Francisco cable cars and a detailed explanation of how a cable car works. Probably the strongest aspect of the site is the sheer amount of visual material available here, including over 150 photos that relate the history of the cable car system and continue on to the present day. Recent additions to the site include a collection of historic cable car transfers and information about a new book on cable cars in San Francisco.

2002-01-01

234

New flame retardant halogen-free cables for nuclear power plants  

SciTech Connect

Special halogen-free cables for installation in nuclear power plants have been developed, manufactured and installed. These cables are characterized by special flame retardant versions of crosslinked polyethylene for insulation, crosslinked EPDM/EVA for sheathing and mineral type flame barriers. Control and power cables provide specified and/or customer demanded performance in all aspects relevant to installation in nuclear power plants as for example flame retardance, freedom from corrosive combustion products, high radiation resistance, functional endurance and LOCA test. 5 refs.

Harbort, H.

1980-01-01

235

Automotive Insulation  

NASA Technical Reports Server (NTRS)

Under a Space Act Agreement between Boeing North America and BSR Products, Space Shuttle Thermal Protection System (TPS) materials are now used to insulate race cars. BSR has created special TPS blanket insulation kits for use on autos that take part in NASCAR events, and other race cars through its nationwide catalog distribution system. Temperatures inside a race car's cockpit can soar to a sweltering 140 to 160 degrees, with the extreme heat coming through the engine firewall, transmission tunnel, and floor. It is common for NASCAR drivers to endure blisters and burns due to the excessive heat. Tests on a car insulated with the TPS material showed a temperature drop of some 50 degrees in the driver's cockpit. BSR-TPS Products, Inc. now manufactures insulation kits for distribution to race car teams around the world.

1997-01-01

236

Thermal Insulation  

NASA Technical Reports Server (NTRS)

Commercially known as Solimide, Temptronics, Inc.'s thermal insulation has application in such vehicles as aircraft, spacecraft and surface transportation systems (i.e. rapid transit cars, trains, buses, and ships) as acoustical treatment for door, wall, and ceiling panels, as a means of reducing vibrations, and as thermal insulation (also useful in industrial equipment). Product originated from research conducted by Johnson Space Center on advanced flame-resistant materials for minimizing fire hazard in the Shuttle and other flight vehicles.

1984-01-01

237

Literature review of environmental qualification of safety-related electric cables: Summary of past work. Volume 1  

SciTech Connect

This report summarizes the findings from a review of published documents dealing with research on the environmental qualification of safety-related electric cables used in nuclear power plants. Simulations of accelerated aging and accident conditions are important considerations in qualifying the cables. Significant research in these two areas has been performed in the US and abroad. The results from studies in France, Germany, and Japan are described in this report. In recent years, the development of methods to monitor the condition of cables has received special attention. Tests involving chemical and physical examination of cable`s insulation and jacket materials, and electrical measurements of the insulation properties of cables are discussed. Although there have been significant advances in many areas, there is no single method which can provide the necessary information about the condition of a cable currently in service. However, it is possible that further research may identify a combination of several methods that can adequately characterize the cable`s condition.

Subudhi, M. [Brookhaven National Lab., Upton, NY (United States)

1996-04-01

238

The 345 kV underground/underwater Long Island Sound cable project  

SciTech Connect

A high voltage underground/underwater cable system was installed to increase the transmission capacity from the mainland of New York to Long Island. In terms of weight and diameter, the self-contained, fluid-filled (SCFF) cable used for the underwater portion of the project is the largest underwater cable in the world. The use of high-pressure, fluid-filled (HPFF) pipe-type cable on the land portion represents the largest application of paper-polypropylene-paper (PPP) insulated cable in the United States. State-of-the-art technologies were implemented in the use of fiber optic cables for relay protection and SCADA/RTU, temperature monitoring and leak detection systems, SF[sub 6] gas-insulated substations, and underwater cable laying and embedment techniques. This paper discusses the design and installation of a 750 MVA, 43 km (26.6 mi), 345 kV underground/underwater electric transmission system installed by the New York Power Authority (NYPA).

Grzan, J.; Hahn, E.I. (New York Power Authority, White Plains, NY (United States)); Casalaina, R.V.; Kansog, J.O.C. (Ebasco Services Inc., Lyndhurst, NJ (United States))

1993-07-01

239

Radiation Testing of a Low Voltage Silicone Nuclear Power Plant Cable.  

SciTech Connect

This report summarizes the results generated in FY13 for cable insulation in support of the Department of Energy's Light Water Reactor Sustainability (LWRS) Program, in collaboration with the US-Argentine Binational Energy Working Group (BEWG). A silicone (SiR) cable, which was stored in benign conditions for ~30 years, was obtained from Comision Nacional de Energia Atomica (CNEA) in Argentina with the approval of NA-SA (Nucleoelectrica Argentina Sociedad Anonima). Physical property testing was performed on the as-received cable. This cable was artificially aged to assess behavior with additional analysis. SNL observed appreciable tensile elongation values for all cable insulations received, indicative of good mechanical performance. Of particular note, the work presented here provides correlations between measured tensile elongation and other physical properties that may be potentially leveraged as a form of condition monitoring (CM) for actual service cables. It is recognized at this point that the polymer aging community is still lacking the number and types of field returned materials that are desired, but Sandia National Laboratories (SNL) -- along with the help of others -- is continuing to work towards that goal. This work is an initial study that should be complimented with location-mapping of environmental conditions of Argentinean plant conditions (dose and temperature) as well as retrieval, analysis, and comparison with in- service cables.

White II, Gregory Von; Schroeder, John Lee.; Sawyer, Patricia Sue.; Wichhart, Derek; Mata, Guillermo Adrian; Zorrilla, Jorge; Bernstein, Robert

2014-09-01

240

Radiation Testing of a Low Voltage Silicone Nuclear Power Plant Cable.  

SciTech Connect

This report summarizes the results generated in FY13 for cable insulation in support of DOE's Light Water Reactor Sustainability (LWRS) Program, in collaboration with the US- Argentine Binational Energy Working Group (BEWG). A silicone (SiR) cable, which was stored in benign conditions for ~30 years, was obtained from Comision Nacional de Energia Atomica (CNEA) in Argentina. Physical property testing was performed on the as-received cable. This cable was artificially aged to assess behavior with additional analysis. SNL observed appreciable tensile elongation values for all cable insulations received, indicative of good mechanical performance. Of particular note, the work presented here provides correlations between measured tensile elongation and other physical properties that may be potentially leveraged as a form of condition monitoring (CM) for actual service cables. It is recognized at this point that the polymer aging community is still lacking the number and types of field returned materials that are desired, but SNL -- along with the help of others -- is continuing to work towards that goal. This work is an initial study that should be complimented with location- mapping of environmental conditions of CNEA plant conditions (dose and temperature) as well as retrieval, analysis, and comparison with in-service cables.

Bernstein, Robert

2014-08-01

241

Evaluation of the radiation resistance of electrical insulation materials  

NASA Astrophysics Data System (ADS)

The qualification of insulating materials for electrical cables is often accomplished according to the IEC 60544 standard of the International Electrotechnical Commission. The mechanical properties of the polymeric insulators are tested prior and after irradiation at relatively high dose rates. To assess the ageing of selected materials under realistic service conditions, usually at lower dose rate, an IEC Working Group has proposed extrapolation methods (IEC 61244-2), one of which is applied here for a cable sheathing material from Huber+Suhner. The method is found to be suitable to compare radiation resistance data of different materials irradiated under different conditions.

Perrin, Sh.; Schönbacher, H.; Tavlet, M.; Widler, R.

2002-12-01

242

Cable coupling lightning transient qualification  

NASA Technical Reports Server (NTRS)

Simulated lightning strike testing of instrumentation cabling on the redesigned solid rocket motor was performed. Testing consisted of subjecting the lightning evaluation test article to simulated lightning strikes and evaluating the effects of instrumentation cable transients on cables within the system tunnel. The maximum short-circuit current induced onto a United Space Boosters, Inc., operational flight cable within the systems tunnel was 92 A, and the maximum induced open-circuit voltage was 316 V. These levels were extrapolated to the worst-case (200 kA) condition of NASA specification NSTS 07636 and were also scaled to full-scale redesigned solid rocket motor dimensions. Testing showed that voltage coupling to cables within the systems tunnel can be reduced 40 to 90 dB and that current coupling to cables within the systems tunnel can be reduced 30 to 70 dB with the use of braided metallic sock shields around cables that are external to the systems tunnel. Testing also showed that current and voltage levels induced onto cables within the systems tunnel are partially dependant on the cables' relative locations within the systems tunnel. Results of current injections to the systems tunnel indicate that the dominant coupling mode on cables within the systems tunnel is not from instrumentation cables but from coupling through the systems tunnel cover seam apertures. It is recommended that methods of improving the electrical bonding between individual sections of the systems tunnel covers be evaluated. Further testing to better characterize redesigned solid rocket motor cable coupling effects as an aid in developing methods to reduce coupling levels, particularly with respect to cable placement within the systems tunnel, is also recommended.

Cook, M.

1989-01-01

243

Tapping the television cable.  

PubMed

Immediate access to patient data is essential to support good clinical decision making and support. However, away from the surgery, the doctor is currently unable to have any access to the clinical database. Solutions exist to support remote access, such as modems or radio data networks, but these are slow, with typical speeds in the 2-10 kbaud region. We propose a novel solution, to use the TV cable already installed in many homes. Using this technology, a suitably equipped computer (RF modern) is capable of connecting at speeds in excess of 500 kbaud and will run applications in exactly the same way as if connected to a surgery network: the cable TV becomes a LAN, but on a metropolitan scale. Brunel University, in collaboration with the Cable Corporation, has been piloting such a network. Issues include not only levels of service, but also security on the network and access, since the data are being effectively received in every home. However, close scrutiny of channel use can create closed networks reserved for specific users. The technology involves use of an RF modem to transmit data on a reverse channel (based at 16 MHz) on each subnet to a router at the head end of the cable network. This frequency translates the packet and retransmits it to all the subnets on a forward channel (based at 178 MHz). Each channel occupies the bandwidth normally allocated to one TV channel. Access is based on a modified CSMA/CD protocol, so treating the cable network as single multiple access network. The modem comes as a standard card installed in a PC and appears much as an ethernet card, but at reduced speed. With an NDIS driver it is quite able to support almost any network software, and has successfully demonstrated Novell and TCP/IP. We describe the HomeWorker network and the results from a pilot study being undertaken to determine the performance of the system and its impact on working practice. PMID:9375105

Clarke, M; Findlay, A; Canac, J F; Vergez, A

1996-01-01

244

Non-Intrusive Cable Tester  

NASA Technical Reports Server (NTRS)

A cable tester is described for low frequency testing of a cable for faults. The tester allows for testing a cable beyond a point where a signal conditioner is installed, minimizing the number of connections which have to be disconnected. A magnetic pickup coil is described for detecting a test signal injected into the cable. A narrow bandpass filter is described for increasing detection of the test signal. The bandpass filter reduces noise so that a high gain amplifier provided for detecting a test signal is not completely saturate by noise. To further increase the accuracy of the cable tester, processing gain is achieved by comparing the signal from the amplifier with at least one reference signal emulating the low frequency input signal injected into the cable. Different processing techniques are described evaluating a detected signal.

Medelius, Pedro J. (Inventor); Simpson, Howard J. (Inventor)

1999-01-01

245

CableLabs: Current Projects  

NSDL National Science Digital Library

This Web site highlights projects being conducted by CableLabs, "a non-profit research and development consortium that is dedicated to pursuing new cable telecommunications technologies." Most of these projects are creating specifications that will improve quality and ensure interoperability of cable systems. Focuses of research include cable modems, interactive services, broadband applications, and more. Each project's home page has extensive documentation on the intended goals and access to all specifications. Some presentations are also given that give a basic overview of the project.

2000-01-01

246

Radiation Insulation  

NASA Technical Reports Server (NTRS)

The Apollo and subsequent spacecraft have had highly effective radiation barriers; made of aluminized polymer film, they bar or let in heat to maintain consistent temperatures inside. Tech 2000, formerly Quantum International Corporation used the NASA technology in its insulating materials, Super "Q" Radiant Barrier, for home, industry and mobile applications. The insulation combines industrial aluminum foil overlaid around a core of another material, usually propylene or mylar. The outer layer reflects up to 97 percent of heat; the central layer creates a thermal break in the structure and thus allows low radiant energy emission. The Quantum Cool Wall, used in cars and trucks, takes up little space while providing superior insulation, thus reducing spoilage and costs. The panels can also dampen sound and engine, exhaust and solar heat.

1995-01-01

247

5. VIEW OF CABLE SHED AND CABLE TRAY EMANATING FROM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. VIEW OF CABLE SHED AND CABLE TRAY EMANATING FROM SOUTH FACE OF LAUNCH OPERATIONS BUILDING. MICROWAVE DISH IN FOREGROUND. METEOROLOGICAL TOWER IN BACKGROUND. - Vandenberg Air Force Base, Space Launch Complex 3, Launch Operations Building, Napa & Alden Roads, Lompoc, Santa Barbara County, CA

248

14 CFR 27.1365 - Electric cables.  

Code of Federal Regulations, 2011 CFR

... 2011-01-01 false Electric cables. 27.1365 Section...and Equipment § 27.1365 Electric cables. (a) Each electric connecting cable must be of...would overheat in the event of circuit overload or fault must...

2011-01-01

249

14 CFR 27.1365 - Electric cables.  

Code of Federal Regulations, 2012 CFR

... 2012-01-01 false Electric cables. 27.1365 Section...and Equipment § 27.1365 Electric cables. (a) Each electric connecting cable must be of...would overheat in the event of circuit overload or fault must...

2012-01-01

250

14 CFR 27.1365 - Electric cables.  

Code of Federal Regulations, 2013 CFR

... 2013-01-01 false Electric cables. 27.1365 Section...and Equipment § 27.1365 Electric cables. (a) Each electric connecting cable must be of...would overheat in the event of circuit overload or fault must...

2013-01-01

251

14 CFR 27.1365 - Electric cables.  

Code of Federal Regulations, 2010 CFR

... 2010-01-01 false Electric cables. 27.1365 Section...and Equipment § 27.1365 Electric cables. (a) Each electric connecting cable must be of...would overheat in the event of circuit overload or fault must...

2010-01-01

252

14 CFR 27.1365 - Electric cables.  

... 2014-01-01 false Electric cables. 27.1365 Section...and Equipment § 27.1365 Electric cables. (a) Each electric connecting cable must be of...would overheat in the event of circuit overload or fault must...

2014-01-01

253

47 CFR 32.2422 - Underground cable.  

Code of Federal Regulations, 2010 CFR

...block wires served by underground cable shall be included in Account 2423, Buried Cable. (d) The cost of cables leading from the main distributing...switching, transmission or other operations asset...

2010-10-01

254

47 CFR 32.2422 - Underground cable.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 2012-10-01 false Underground cable. 32.2422 Section 32...Balance Sheet Accounts § 32.2422 Underground cable. (a) This account shall include the original cost of underground cable installed in conduit...

2012-10-01

255

47 CFR 32.2422 - Underground cable.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 false Underground cable. 32.2422 Section 32...Balance Sheet Accounts § 32.2422 Underground cable. (a) This account shall include the original cost of underground cable installed in conduit...

2013-10-01

256

Universal cable head for a multiconductor logging cable  

SciTech Connect

This patent describes a universal cable head. It comprises: an armored logging cable having up to seven electrical conductors therein and incorporating a woven wire rope, and a surrounding armor wrap; stress relieving stinger means on the cable; an encircling housing to transfer axial loads from the cable to the housing; an internal transverse bulkhead within the housing adjacent to an internal cavity therein; electrical feedthrus for connection of conductors in the logging cable; exposed mating connectors electrically connected to the feedthrus; the housing extending past and encircling the mating connectors; and a rotatable, shoulder limited sleeve on the exterior of the housing having threading means thereon for connecting with a mating female connector.

Ip, M.

1989-10-17

257

Magnetic Insulation  

Microsoft Academic Search

The present understanding of magnetic insulation is reviewed. For stationary flows in constant impedance regions, the single particle description, laminar flow theory, quasi-aminar flow, and flows with arbitrary momenta are presented. Then, nonstationary flows and their laminar flow approximations, the minimum energy operating point, and some questions on their stability are discussed. Equivalent circuit simulations, particle in cell simulations, and

Marco S. Di Capua

1983-01-01

258

Microsphere insulation systems  

NASA Technical Reports Server (NTRS)

A new insulation system is provided that contains microspheres. This insulation system can be used to provide insulated panels and clamshells, and to insulate annular spaces around objects used to transfer, store, or transport cryogens and other temperature-sensitive materials. This insulation system provides better performance with reduced maintenance than current insulation systems.

Allen, Mark S. (Inventor); Willen, Gary S. (Inventor); Mohling, Robert A. (Inventor)

2005-01-01

259

Localization of partial discharge sources along HV and MV cable routes  

Microsoft Academic Search

In this paper, partial discharge (PD) source localization on HV polymeric cable systems is dealt with. The capability to detect defects within insulating systems helps avoid premature and unexpected failures and constitutes the prerequisite for any effective risk analysis. Therefore, partial discharge assessment, mainly aimed at detecting localized degradations, can improve reliability and availability of electrical apparatus, supporting effective practices

F. Puletti; M. Olivieri; A. Cavallini; G. C. Montanari

2005-01-01

260

Plowing Cables Under the Sea  

Microsoft Academic Search

The principal cause of submarine telephone cable failures has been fishing activities on the continental shelf, particularly in the Western Atlantic area. The Bell System has conducted extensive investigation of methods of burying these cables in the affected area to eliminate this hazard. This has culminated in the development of a unique underwater plow which was used successfully in July

C. Duncan

1969-01-01

261

Cable Television and Public Safety.  

ERIC Educational Resources Information Center

One of the most promising applications of cable television (CATV) is municipal surveillance of public areas for protection against crime, fire detection, control of air pollution, and traffic. Thus far, however, the CATV industry has made minimal efforts to realize the potential of CATV for community protection--the use of cable for public safety…

Cranberg, Gilbert

262

Cable Television: Notebook Number Five.  

ERIC Educational Resources Information Center

Cable television has been introduced to the public as a revolutionary development in communications, but its history, evolving structure, and present operation indicate otherwise. A few large industrial conglomerates have come to dominate the field of cable television and studies by private institutions and the regulatory activities of the Federal…

Notebook, 1973

1973-01-01

263

47 CFR 36.153 - Assignment of Cable and Wire Facilities (C&WF) to categories.  

Code of Federal Regulations, 2012 CFR

...and Wire Facilities (C&WF) to categories. (a) Cable consists of: Aerial cable, underground cable, buried cable, submarine cable, deep sea cable and intrabuilding network cable. Where an entire cable or aerial wire is assignable to one...

2012-10-01

264

47 CFR 36.153 - Assignment of Cable and Wire Facilities (C&WF) to categories.  

Code of Federal Regulations, 2011 CFR

...and Wire Facilities (C&WF) to categories. (a) Cable consists of: Aerial cable, underground cable, buried cable, submarine cable, deep sea cable and intrabuilding network cable. Where an entire cable or aerial wire is assignable to one...

2011-10-01

265

47 CFR 36.153 - Assignment of Cable and Wire Facilities (C&WF) to categories.  

Code of Federal Regulations, 2013 CFR

...and Wire Facilities (C&WF) to categories. (a) Cable consists of: Aerial cable, underground cable, buried cable, submarine cable, deep sea cable and intrabuilding network cable. Where an entire cable or aerial wire is assignable to one...

2013-10-01

266

47 CFR 36.153 - Assignment of Cable and Wire Facilities (C&WF) to categories.  

Code of Federal Regulations, 2010 CFR

...and Wire Facilities (C&WF) to categories. (a) Cable consists of: Aerial cable, underground cable, buried cable, submarine cable, deep sea cable and intrabuilding network cable. Where an entire cable or aerial wire is assignable to one...

2010-10-01

267

Change of electrical characteristics of radio-frequency cables under thermal effect  

NASA Astrophysics Data System (ADS)

Four basic temperature dependent electrical parameters of r-f cables are described by expressions which facilitate an analysis of their sensitivity to temperature effects, these parameters being capacitance, wave impedance, attenuation factor and phase shift factor. Calculations for coaxial cables are based on an equivalent dielectric permittivity of the insulation system, including air gap between dielectric and outer conductor produced in the manufacturing process as well as the air gap between dielectric and inner conductor produced by variation of the radius of the latter. Mechanical strains affecting the system geometry are found from the solution to Lame's problem for thin walled cylinders and Hooke's law extended to a three dimensional state of stress. For illustration, numerical results are given for RK-3-28-Pr high precision cables with monolithic Teflon-4D insulation (dielectric constant epsilon = 2.03 at 20 C).

Lobanov, A. V.; Pavlov, P. P.; Khrenkov, N. N.

1985-01-01

268

Cut-through tester accurately measures insulation failure rates  

NASA Technical Reports Server (NTRS)

Cut-through tester electronically measures the rate of failure of various wire and cable insulating materials both as to time and the amount of applied pressure. The force /weight/ acting on the penetrator can be applied through a near infinite range.

Baker, E. U.

1967-01-01

269

Photonic-powered cable assembly  

DOEpatents

A photonic-cable assembly includes a power source cable connector ("PSCC") coupled to a power receive cable connector ("PRCC") via a fiber cable. The PSCC electrically connects to a first electronic device and houses a photonic power source and an optical data transmitter. The fiber cable includes an optical transmit data path coupled to the optical data transmitter, an optical power path coupled to the photonic power source, and an optical feedback path coupled to provide feedback control to the photonic power source. The PRCC electrically connects to a second electronic device and houses an optical data receiver coupled to the optical transmit data path, a feedback controller coupled to the optical feedback path to control the photonic power source, and a photonic power converter coupled to the optical power path to convert photonic energy received over the optical power path to electrical energy to power components of the PRCC.

Sanderson, Stephen N; Appel, Titus James; Wrye, IV, Walter C

2014-06-24

270

The influence of defects on the short-term breakdown characteristics and long-term dc performance of LDPE insulation  

Microsoft Academic Search

Extruded polyethylene is used as the bulk insulation for ac HV cables because of its high electric resistivity and breakdown strength. Although the material at present has limited use in dc power cables, it is used extensively in submarine optical communication cable systems. This paper reports on the study of the short-term characteristics and long-term performance of low-density polyethylene (LDPE)

G. Chen; A. E. Davies

2000-01-01

271

Stability and AC loss of superconducting cables— Analysis of current imbalance and inter-strand coupling losses  

NASA Astrophysics Data System (ADS)

The current imbalance and the inter-strand coupling losses are studied for the 3×3twisted superconducting cables exposed to the temporally-changing external magnetic field or carrying the temporally-changing transport current. The current distribution is calculated based on electrical circuit models. When the cable length is not the common multiple of the twist pitches of the first-stage and second-stage cablings, the current imbalance among strands appears in the cables made with insulated strands. When the insulation of strand is removed, the transverse current flows across he contact resistance between strands. This results in a local current imbalance among strands and an additional inter-strand coupling loss.

Amemiya, Naoyuki; Kikuchi, Takayuki; Hanafusa, Tadayoshi; Tsukamoto, Osami

272

Overload and High Voltage Tests of Witness Samples of 200m HTS Power Cable  

NASA Astrophysics Data System (ADS)

1.5/2 kA - 20 kV has been developed and passed acceptance test in December 2009. This cable has superconducting shield and is made of DI-BSSCO™ HT-CA wires from Sumitomo Electric Company. The cable is installed at the experimental test facility to undergo extensive tests first, than it will be reinstalled to Moscow utility grid. As a part of the wide test program the fault current tests and high voltage tests were performed with pieces of the full length cable - so called witness samples. 44 kA fault current test has been performed as well as high voltage test for cable's insulation. In this paper the results of fault current test and high voltage test are presented, discussed and analyzed.

Nosov, A. A.; Fetisov, S. S.; Zubko, V. V.; N. V. Polyakova; Vysotsky, V. S.; Yu. G. Shakaryan; Kiselev, A. N.; Kovalenko, A. Yu.

273

Cryogenic Insulation  

NASA Technical Reports Server (NTRS)

Kevin Rivers, Thermal Structures Branch, checks electronic wiring on a test panel for a cryogenic insulation system. The thermal-mechanical testing is being done for Lockheed Martin as part of the X-33 Reusable Launch Vehicle (RLV) program. The foam panel, encased in an aluminum alloy, will be subjected to very low and very high temperatures and then be placed under heavyloads as part of the testing. Material in this panel may be used as part of an RLV fuel tank.

1996-01-01

274

High-current dc power transmission in flexible RE-Ba2Cu3O7 - ? coated conductor cables  

NASA Astrophysics Data System (ADS)

Transmission cables made from high-temperature superconductors have been successfully demonstrated within the electric power grid. These cables carry an ac current of up to 3000 A in a much smaller cross-sectional area than conventional transmission lines, but they are not flexible enough for certain applications that involve very tight cable bends. Certain on-board Air Force applications require 5 MW of dc power transmission at 270 V and current of 18 500 A and would benefit from superconducting transmission in lightweight, flexible cables that would be cooled with helium gas down to about 55 K. To address these needs, we have constructed a 10 mm diameter RE-Ba2Cu3O7 - ? (RE = rare earth) coated conductor cable that is lighter and more flexible than the current generation of superconducting cables, and that has a critical current of 7561 A at 76 K. The cable is expected to have a critical current of more than 20 000 A at 55 K and therefore will likely exceed the requirements for 5 MW on-board power transmission. The cable consists of two electrically insulated phases that can be operated in different modes, which allows us to study the effect of self-field on the cable performance. Contribution of NIST, not subject to US copyright.

van der Laan, D. C.; Goodrich, L. F.; Haugan, T. J.

2012-01-01

275

Identification of tool marks of a sickle on a telephone cable.  

PubMed

Linkage of a cutting tool (a sickle) with a telephone cable of 100 pairs of copper wires is reported in a case of theft of a telephone cable. Telephone cables contain numerous insulated copper wires of small diameter inside an outer covering and are stolen for the relatively precious copper. The cutting pattern of the cable can only point to the type of the tool but because of the large number of copper wires, it is practically difficult to make a definite linkage with the tool used to cut the cable by comparing the tool marks. The present work reports the successful attempt of the authors in establishing a definite linkage of a stolen telephone cable with a sickle recovered from the suspects. Spot microchemical test was performed for detection of copper on the blade of the sickle, and then tool mark comparison was performed to link the tool marks on the metal strip inside the outer covering of the cable to the blade of the sickle. PMID:22971125

Kumar, Rajesh; Patial, Naseeb; Singh, Sanjeev

2013-01-01

276

Cable Modem Technology Implementation: Challenges and Prospects.  

ERIC Educational Resources Information Center

Describes cable modem technology (i.e., an external device that facilitates high-speed access to the Internet via the same network configuration employed for cable television). Examples of cable field trials carried out in collaboration with educational user communities are presented, and cable technical capabilities, advantages, and constraints…

Littman, Marlyn Kemper

1998-01-01

277

Cable Television: Citizen Participation in Planning.  

ERIC Educational Resources Information Center

The historical background of citizen participation in local affairs and its relevance at the onset of community concern about cable television are briefly discussed in this report. The participation of citizens, municipal officials, and cable operators in laying the groundwork for a cable system as well as the pros and cons of cable television as…

Yin, Robert K.

278

Cables and connectors: A compilation  

NASA Technical Reports Server (NTRS)

A compilation is presented that reflects the uses, adaptation, and maintenance plus service, that are innovations derived from problem solutions in the space R and D programs, both in house and by NASA and AEC contractors. Data cover: (1) technology revelant to the employment of flat conductor cables and their adaptation to and within conventional systems, (2) connectors and various adaptations, and (3) maintenance and service technology, and shop hints useful in the installation and care of cables and connectors.

1974-01-01

279

Program Assists Design Of Cabling  

NASA Technical Reports Server (NTRS)

DFACS is interactive, multiuser, computer-aided-engineering software tool for system-level electrical-integration and cabling engineering. Purpose to provide engineering community with centralized data base for entering and gaining access to definitions of functions of systems, details of pin connections to circuits at subsystem and instrument ends and data on harnessing of cables. Primary objective provides instantaneous single point of interchange of information, avoiding error-prone, time-consuming, and costly multiple-path shuttling of data.

Billitti, Joseph W.

1992-01-01

280

A Practical Method for Cable Failure Rate Modeling  

Microsoft Academic Search

As underground cables continue to increase in age, most utilities are experiencing an increase in underground cable failures. Since cable replacement programs are expensive, it is important to understand the impact that age and other cable characteristics have on cable failure rates. This paper presents a practical method to model cable failure rates categorized by cable features. It addresses the

Yujia Zhou; Richard E. Brown

2006-01-01

281

Optical fiber cables for residential and business premises  

Microsoft Academic Search

This paper describes a new drop cable, a new cluster-type drop cable for residential premises, a new indoor cable, a new termination cable and a new riser cable for fiber distribution in residential and business premises. The structural design of these cables is investigated and the optimum structures for cost reduction of cable and installation are obtained. Based on the

Kazuo Hogari; Shin-Ichi Furukawa; Kanemitsu Tomiyama; Yoshinori Nakatsuji; Sadaaki Koshio; Kaoru Nishizawa

1998-01-01

282

Tank Insulation  

NASA Technical Reports Server (NTRS)

For NASA's Apollo program, McDonnell Douglas Astronautics Company, Huntington Beach, California, developed and built the S-IVB, uppermost stage of the three-stage Saturn V moonbooster. An important part of the development task was fabrication of a tank to contain liquid hydrogen fuel for the stage's rocket engine. The liquid hydrogen had to be contained at the supercold temperature of 423 degrees below zero Fahrenheit. The tank had to be perfectly insulated to keep engine or solar heat from reaching the fuel; if the hydrogen were permitted to warm up, it would have boiled off, or converted to gaseous form, reducing the amount of fuel available to the engine. McDonnell Douglas' answer was a supereffective insulation called 3D, which consisted of a one-inch thickness of polyurethane foam reinforced in three dimensions with fiberglass threads. Over a 13-year development and construction period, the company built 30 tanks and never experienced a failure. Now, after years of additional development, an advanced version of 3D is finding application as part of a containment system for transporting Liquefied Natural Gas (LNG) by ship.

1979-01-01

283

Flat conductor cable design, manufacture, and installation  

NASA Technical Reports Server (NTRS)

Pertinent information for hardware selection, design, manufacture, and quality control necessary for flat conductor cable interconnecting harness application is presented. Comparisons are made between round wire cable and flat conductor cable. The flat conductor cable interconnecting harness systems show major cost, weight, and space savings, plus increased system performance and reliability. The design application section includes electrical characteristics, harness design and development, and a full treatise on EMC considerations. Manufacturing and quality control sections pertain primarily to the developed conductor-contact connector system and special flat conductor cable to round wire cable transitions.

Angele, W.; Hankins, J. D.

1973-01-01

284

Charge-Dissipative Electrical Cables  

NASA Technical Reports Server (NTRS)

Electrical cables that dissipate spurious static electric charges, in addition to performing their main functions of conducting signals, have been developed. These cables are intended for use in trapped-ion or ionizing-radiation environments, in which electric charges tend to accumulate within, and on the surfaces of, dielectric layers of cables. If the charging rate exceeds the dissipation rate, charges can accumulate in excessive amounts, giving rise to high-current discharges that can damage electronic circuitry and/or systems connected to it. The basic idea of design and operation of charge-dissipative electrical cables is to drain spurious charges to ground by use of lossy (slightly electrically conductive) dielectric layers, possibly in conjunction with drain wires and/or drain shields (see figure). In typical cases, the drain wires and/or drain shields could be electrically grounded via the connector assemblies at the ends of the cables, in any of the conventional techniques for grounding signal conductors and signal shields. In some cases, signal shields could double as drain shields.

Kolasinski, John R.; Wollack, Edward J.

2004-01-01

285

Fabrication of Nb3Sn Shell-Type Coils with Pre-Preg Ceramic Insulation  

SciTech Connect

Insulation is one of the critical components for high-field Nb3Sn magnets that follow wind-and-react approach. The insulation material has to withstand high bending stresses while winding the coil and high heat-treatment temperatures under pressure during coil reaction. At Fermilab we have developed a procedure and tested successfully the dry ceramic insulation tape with inorganic liquid binder to wind and cure the coils. Recently we have extended this to a pre-preg ceramic insulation tape, which would minimize and control the amount of binder in the coil. Several coils with various insulation patterns have been fabricated and tested at Fermilab. This paper discusses the fabrication issues of the coils with different types of cable insulation including the pre-preg ceramic insulation.

Chichili, D.R.; Andreev, N.; Kashikhin, V.S.; Zlobin, A.V. [Fermi National Accelerator Laboratory, Batavia, Illinois, 60510 (United States); Codell, D.; Fabian, P.; Tupper, M. [Composite Technology Development, Inc., Lafayette, Colorado, 80026 (United States)

2004-06-28

286

CABLE DESIGN FOR FAST RAMPED SUPERCONDUCTING MAGNETS (COS-0 DESIGN).  

SciTech Connect

The new heavy ion synchrotron facility proposed by GSI will have two superconducting magnet rings in the same tunnel, with rigidities of 300 T-m and 100 T-m. Fast ramp times are needed, which can cause significant problems for the magnets, particularly in the areas of ac loss and magnetic field distortion. The development of the low loss Rutherford cable that can be used is described, together with a novel insulation scheme designed to promote efficient cooling. Measurements of contact resistance in the cable are presented and the results of these measurements are used to predict the ac losses, in the magnets during fast ramp operation. For the high energy ring, a lm model dipole magnet was built, based on the RHIC dipole design. This magnet was tested under boiling liquid helium in a vertical cryostat. The quench current showed very little dependence on ramp rate. The ac losses, measured by an electrical method, were fitted to straight line plots of loss/cycle versus ramp rate, thereby separating the eddy current and hysteresis components. These results were compared with calculated values, using parameters which had previously been measured on short samples of cable. Reasonably good agreement between theory and experiment was found, although the measured hysteresis loss is higher than expected in ramps to the highest field levels.

GHOSH,A.

2004-03-22

287

Multiple density layered insulator  

DOEpatents

A multiple density layered insulator for use with a laser is disclosed wh provides at least two different insulation materials for a laser discharge tube, where the two insulation materials have different thermoconductivities. The multiple layer insulation materials provide for improved thermoconductivity capability for improved laser operation.

Alger, Terry W. (Tracy, CA)

1994-01-01

288

Calcium silicate insulation structure  

DOEpatents

An insulative structure including a powder-filled evacuated casing utilizes a quantity of finely divided synthetic calcium silicate having a relatively high surface area. The resultant structure-provides superior thermal insulating characteristics over a broad temperature range and is particularly well-suited as a panel for a refrigerator or freezer or the insulative barrier for a cooler or a insulated bottle.

Kollie, Thomas G. (Oak Ridge, TN); Lauf, Robert J. (Oak Ridge, TN)

1995-01-01

289

Insulation Materials Investigation  

NSDL National Science Digital Library

Students test the insulation properties of different materials by timing how long it takes ice cubes to melt in the presence of various insulating materials. Students learn about the role that thermal insulation materials can play in reducing heat transfer by conduction, convection and radiation, as well as the design and implementation of insulating materials in construction and engineering.

National Science Foundation GK-12 and Research Experience for Teachers (RET) Programs,

290

30 CFR 75.600-1 - Approved cables; flame resistance.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 false Approved cables; flame resistance. 75.600-1 Section 75...Cables § 75.600-1 Approved cables; flame resistance. Cables shall be accepted or approved by MSHA as flame resistant. [57 FR 61223, Dec....

2010-07-01

291

46 CFR 111.60-5 - Cable installation.  

Code of Federal Regulations, 2012 CFR

...in the tank or protected by an enclosure; and (3) Neither braided cable armor nor cable metallic sheath is used as the grounding conductor. (d) Braided cable armor or cable metallic sheath must not be used as the grounding conductor....

2012-10-01

292

46 CFR 111.60-5 - Cable installation.  

Code of Federal Regulations, 2013 CFR

...in the tank or protected by an enclosure; and (3) Neither braided cable armor nor cable metallic sheath is used as the grounding conductor. (d) Braided cable armor or cable metallic sheath must not be used as the grounding conductor....

2013-10-01

293

46 CFR 111.60-5 - Cable installation.  

Code of Federal Regulations, 2010 CFR

...in the tank or protected by an enclosure; and (3) Neither braided cable armor nor cable metallic sheath is used as the grounding conductor. (d) Braided cable armor or cable metallic sheath must not be used as the grounding conductor....

2010-10-01

294

Umbilical cable recovery load analysis  

NASA Astrophysics Data System (ADS)

Umbilical cable is a kind of integrated subsea cable widely used in the exploration and exploitation of oil and gas field. The severe ocean environment makes great challenges to umbilical maintenance and repair work. Damaged umbilical is usually recovered for the regular operation of the offshore production system. Analysis on cables in essence is a two-point boundary problem. The tension load at the mudline must be known first, and then the recovery load and recovery angle on the vessel can be solved by use of catenary equation. The recovery analysis also involves umbilical-soil interaction and becomes more complicated. Calculation methods for recovery load of the exposed and buried umbilical are established and the relationship between the position of touch down point and the recovery load as well as the recovery angle and recovery load are analyzed. The analysis results provide a theoretical reference for offshore on-deck operation.

Yan, Shu-wang; Jia, Zhao-lin; Feng, Xiao-wei; Li, Shi-tao

2013-06-01

295

Double copper sheath multiconductor instrumentation cable is durable and easily installed in high thermal or nuclear radiation area  

NASA Technical Reports Server (NTRS)

Multiconductor instrumentation cable in which the conducting wires are routed through two concentric copper tube sheaths, employing a compressed insulator between the conductors and between the inner and outer sheaths, is durable and easily installed in high thermal or nuclear radiation area. The double sheath is a barrier against moisture, abrasion, and vibration.

Mc Crae, A. W., Jr.

1967-01-01

296

On designing and building equipment for a wide-scale production of SC transposed cable for UNK  

Microsoft Academic Search

The complex of equipment assigned for large-scale production of SC (superconductor) transposed cable (STC) for the UNK magnet system is described. The complex consists of composite superconductor twisting machines, control-rewinding machines, facilities for coating the superconductor with Sn+5% Ag layer, transposing machines, ultrasonic cleaning facilities, insulating machines, and a machine to impregnate fiberglass tape with epoxide compound

E. R. Borisov; A. N. Surkov

1992-01-01

297

Online Cable Tester and Rerouter  

NASA Technical Reports Server (NTRS)

Hardware and algorithms have been developed to transfer electrical power and data connectivity safely, efficiently, and automatically from an identified damaged/defective wire in a cable to an alternate wire path. The combination of online cable testing capabilities, along with intelligent signal rerouting algorithms, allows the user to overcome the inherent difficulty of maintaining system integrity and configuration control, while autonomously rerouting signals and functions without introducing new failure modes. The incorporation of this capability will increase the reliability of systems by ensuring system availability during operations.

Lewis, Mark; Medelius, Pedro

2012-01-01

298

Equalization of data transmission cable  

NASA Technical Reports Server (NTRS)

The paper describes an equalization approach utilizing a simple RLC network which can obtain a maximum slope of -12dB/octave for reshaping the frequency characteristics of a data transmission cable, so that data may be generated and detected at the receiver. An experimental procedure for determining equalizer design specifications using distortion analysis is presented. It was found that for lengths of 16 PEV-L cable of up to 5 miles and data transmission rates of up to 1 Mbs, the equalization scheme proposed here is sufficient for generation of the data with acceptable error rates.

Zobrist, G. W.

1975-01-01

299

Debris protection cover assembly for cable connectors  

NASA Technical Reports Server (NTRS)

A protective cover assembly for an end of a cable connector having a cable housing that encloses a plurality of connective pins or sockets and that satisfies all requirements for space applications. A connector body flange is formed at the extremity of a cable and is positioned so that it may register with a corresponding connector body flange on the end of a companion cable to which a connection is to be made, one cable end having cable lead pins and the companion cable end having lead sockets with which the pins register. A latch mechanism having a latch housing is received in the connector body flange and a crank connected to a manually rotatable cap actuates a spring-loaded latch element that is engageable with a connector body flange to secure or to release the cover assembly with the simple twisting motion of the cap, thereby simplifying the task of effecting coupling and decoupling of the cable ends.

Yovan, Roger D. (Inventor)

1999-01-01

300

Coaxial cable stripper for confined areas  

NASA Technical Reports Server (NTRS)

Manual coaxial cable stripper quickly and accurately prepares a coaxial cable in a confined area. With this tool, preparation time is greatly reduced, and a completely inexperienced technician can perform the operation.

Brown, J. D.; Lipscomb, W. G.

1968-01-01

301

Ames Lab 101: Reinventing the Power Cable  

ScienceCinema

Ames Laboratory researchers are working to develop new electrical power cables that are stronger and lighter than the cables currently used in the nation's power grid. Nano Tube animation by Iain Goodyear

Russell, Alan

2014-06-04

302

Ames Lab 101: Reinventing the Power Cable  

SciTech Connect

Ames Laboratory researchers are working to develop new electrical power cables that are stronger and lighter than the cables currently used in the nation's power grid. Nano Tube animation by Iain Goodyear

Russell, Alan

2013-09-27

303

14 CFR 23.689 - Cable systems.  

Code of Federal Regulations, 2010 CFR

...cable fitting, turnbuckle, splice, and pulley used must meet approved specifications...for visual inspection at each fairlead, pulley, terminal, and turnbuckle. (b) Each kind and size of pulley must correspond to the cable with...

2010-01-01

304

14 CFR 25.689 - Cable systems.  

Code of Federal Regulations, 2010 CFR

...cable fitting, turnbuckle, splice, and pulley must be approved. In addition— (1...variations. (b) Each kind and size of pulley must correspond to the cable with which it is used. Pulleys and sprockets must have closely...

2010-01-01

305

14 CFR 23.689 - Cable systems.  

Code of Federal Regulations, 2013 CFR

...cable fitting, turnbuckle, splice, and pulley used must meet approved specifications...for visual inspection at each fairlead, pulley, terminal, and turnbuckle. (b) Each kind and size of pulley must correspond to the cable with...

2013-01-01

306

14 CFR 25.689 - Cable systems.  

Code of Federal Regulations, 2011 CFR

...cable fitting, turnbuckle, splice, and pulley must be approved. In addition— (1...variations. (b) Each kind and size of pulley must correspond to the cable with which it is used. Pulleys and sprockets must have closely...

2011-01-01

307

14 CFR 25.689 - Cable systems.  

...cable fitting, turnbuckle, splice, and pulley must be approved. In addition— (1...variations. (b) Each kind and size of pulley must correspond to the cable with which it is used. Pulleys and sprockets must have closely...

2014-01-01

308

14 CFR 25.689 - Cable systems.  

Code of Federal Regulations, 2012 CFR

...cable fitting, turnbuckle, splice, and pulley must be approved. In addition— (1...variations. (b) Each kind and size of pulley must correspond to the cable with which it is used. Pulleys and sprockets must have closely...

2012-01-01

309

14 CFR 25.689 - Cable systems.  

Code of Federal Regulations, 2013 CFR

...cable fitting, turnbuckle, splice, and pulley must be approved. In addition— (1...variations. (b) Each kind and size of pulley must correspond to the cable with which it is used. Pulleys and sprockets must have closely...

2013-01-01

310

14 CFR 23.689 - Cable systems.  

Code of Federal Regulations, 2012 CFR

...cable fitting, turnbuckle, splice, and pulley used must meet approved specifications...for visual inspection at each fairlead, pulley, terminal, and turnbuckle. (b) Each kind and size of pulley must correspond to the cable with...

2012-01-01

311

14 CFR 23.689 - Cable systems.  

Code of Federal Regulations, 2011 CFR

...cable fitting, turnbuckle, splice, and pulley used must meet approved specifications...for visual inspection at each fairlead, pulley, terminal, and turnbuckle. (b) Each kind and size of pulley must correspond to the cable with...

2011-01-01

312

14 CFR 23.689 - Cable systems.  

...cable fitting, turnbuckle, splice, and pulley used must meet approved specifications...for visual inspection at each fairlead, pulley, terminal, and turnbuckle. (b) Each kind and size of pulley must correspond to the cable with...

2014-01-01

313

Performance Evaluation of K-DEMO Cable-in-conduit Conductors Using the Florida Electro-Mechanical Cable Model  

SciTech Connect

The United States ITER Project Office (USIPO) is responsible for design of the Toroidal Field (TF) insert coil, which will allow validation of the performance of significant lengths of the conductors to be used in the full scale TF coils in relevant conditions of field, current density and mechanical strain. The Japan Atomic Energy Agency (JAEA) will build the TF insert which will be tested at the Central Solenoid Model Coil (CSMC) Test facility at JAEA, Naka, Japan. Three dimensional mathematical model of TF Insert was created based on the initial design geometry data, and included the following features: orthotropic material properties of superconductor material and insulation; external magnetic field from CSMC, temperature dependent properties of the materials; pre-compression and plastic deformation in lap joint. Major geometrical characteristics of the design were preserved including cable jacket and insulation shape, mandrel outline, and support clamps and spacers. The model is capable of performing coupled structural, thermal, and electromagnetic analysis using ANSYS. Numerical simulations were performed for room temperature conditions; cool down to 4K, and the operating regime with 68kA current at 11.8 Tesla background field. Numerical simulations led to the final design of the coil producing the required strain levels on the cable, while simultaneously satisfying the ITER magnet structural design criteria.

Zhai, Yuhu

2013-07-16

314

Establishing a Benthic Cabled Observatory with ROV Based Cable Deployment  

Microsoft Academic Search

The Monterey Bay Aquarium Research Institute (MBARI) in support of the MBARI Ocean Observation System (MOOS) Science Experiment 2006 (MSE06) has established a benthic cabled observatory. The goal of MSB 06 is to study deep seafloor processes within and adjacent to the outer Monterey Bay Submarine Canyon. At the study site near Shepard Meander, a Benthic Instrument Node (BIN) and

L. E. Bird; D. Graves; G. Massion; M. Chaffey; R. Keaten

2006-01-01

315

Validation of a real-time cable deployment control system for slack cable laying  

Microsoft Academic Search

The validation of a real-time control system for the deployment of submarine communication cables presented. The control system allows the user accurately control cable bottom slack and position the cable along a pre-planned route. The system was successfully used to lay an underwater acoustic tracking range for the US Navy. A total of eight, 40 mile long cables, each having

J. M. Andres; S. R. Jefferies; G. Gillenwaters

1993-01-01

316

Proceedings: JICABLE/EPRI/CEA Workshop ''Cable 89'': The Aging of Extruded Dielectric Cables  

SciTech Connect

Service experience data on solid-dielectric power distribution cables show that significant numbers of cables exhibit a shorter-than-desired lifetime. Although less data exist on transmission class cables, the aging parameters, with the exception of moisture, should be similar. A recent workshop addressed means of improving both distribution and transmission-class cable lifetime and performance reliability at a reasonable cost.

None

1990-12-01

317

Hawaii Deep Water Cable Program: Executive Summary  

SciTech Connect

The Hawaii Deep Water Cable Program has succeeded unequivocally in determining the feasibility of deploying a submarine power cable system between the islands of Hawaii and Oahu. Major accomplishments of the program include designing, fabricating and testing an appropriate power cable, developing an integrated system to control all aspects of the cable laying operation, and testing all deployment systems at sea in the most challenging sections of the route.

None

1990-09-01

318

Development of Pre-Preg Ceramic Insulation for Superconducting Magnets  

SciTech Connect

A new pre-impregnated (pre-preg) ceramic-based electrical insulation system capable of surviving high superconductor reaction temperatures has been developed for use in superconducting magnets. The use of Nb3Sn superconductors holds great promise for increased magnet performance for high energy physics, fusion, and other applications. A robust, cost-effective manufacturing process is critical to the successful implementation of these coils. Due to its embrittlement after the high temperature reaction cycle, Nb3Sn cable is usually insulated and wound into the coil prior to heat treatment. An earlier ceramic-based insulation system, applied using wet-winding or vacuum impregnation, has been successfully used in the 'wind and react' fabrication process. Use of the new pre-preg system will further simplify the manufacturing process while improving control over the insulation properties. Pre-preg insulation offers several advantages including improved dimensional control of the insulation, controllable and uniform fiber to matrix ratio, and certainty that the insulation does not infiltrate the superconductor. This paper describes the pre-preg development process, processing properties, as well as insulation performance data at cryogenic temperatures.

Codell, D.E.; Fabian, P.E. [Composite Technology Development, Inc., Lafayette, Colorado, 80026 (United States)

2004-06-28

319

Insulation Characteristics of Bushing Shed at Cryogenic Temperature  

NASA Astrophysics Data System (ADS)

In the development of high-Tc superconducting(HTS) devices, the bushing for HTS devices (HTS bushing) is the core technology, the need to because of supply high voltage to the cable or the winding of the transformer. The lower part of the bushing is exposed to the liquid nitrogen (LN2), and it has many sheds. In particular, the insulation body with sheds and electrical insulation at cryogenic temperature have attracted a great deal of interest from the view point of the size, weight and efficiency of bushing. This study has mainly investigated the shed and insulation body by comparing glass fiber reinforced plastics (GFRP) in LN2. We investigated the surface discharge characteristics according to insulating materials, width and height of the shed.

Kim, W. J.; Kim, Y. J.; Kim, S. H.

2014-05-01

320

Advanced power cable technology. Volume I. Basic concepts and testing  

Microsoft Academic Search

This volume is divided into the following chapters and subchapters: introduction (electric energy, underground transmission), materials science in cable technology (concept of cable design, cable structural materials, electrical breakdown characteristics, long-term characteristics, statistical analysis methods, space charge effects in dc cables), and testing (taped cables, extruded cables, maintenance tests, partial discharge measurement, fault locating). (DLC)

T. Tanaka; A. Greenwood

1983-01-01

321

The Submarine Optical Cable of the Submarcom S 280 System  

Microsoft Academic Search

Submarine optical telecommunication cables must satisfy a large number of specific items. To comply with specifications, CDL has developed a cable structure based on high-performance optical fibers placed with slack in the grooves of a plastic rod put in the center of a very strong cable. The deep-sea cable is the basic structure for armored cables or land cables. Armor

J. Trezeguet; P. Ollion; P. Franco; J. Thiennot

1984-01-01

322

Intrepid MicroTrack leaky cable sensor  

Microsoft Academic Search

Intrepid MicroTrack is the first leaky coaxial cable sensor to utilize FM CW radar techniques to detect and locate intruders. The first leaky coaxial cable sensor, introduced at the 1976 Carnahan Conference in Lexington, Kentucky, used pulse radar techniques to detect and locate intruders. Since then, there have been numerous papers on CW leaky cable sensors that detect, but do

R. Keith Harman

2002-01-01

323

Cable Feedthrough Between Liquid Oxygen And Ambient  

NASA Technical Reports Server (NTRS)

Encapsulant and back pressure provide double protection. Cable-feedthrough tube between ambient air and interior of vessel containing liquid oxygen protects external instrumentation and cable from oxygen. Cable in tube surrounded by potting compound. Provides flow of gaseous nitrogen to dilute oxidant and makes it harmless in case of leakage through crack in potting compound.

Myers, Don A.

1992-01-01

324

Broadband Connection DSL vs. Cable Modem  

E-print Network

Broadband Connection DSL vs. Cable Modem Michael Bausha CS553A Intro to Networking: Final Project Family Section Four: Broadband: DSL vs. Cable Modem Comparison Providers Current Markets and Statistics) and Cable Modem. Broadband has turned Internet access into a fast, multiple signal technology. To qualify

Riabov, Vladimir V.

325

Cable design for optical submarine systems  

Microsoft Academic Search

Transoceanic communication systems using coaxial cables with repeaters have been in use since the 1950's and there is now a very extensive international network. All major manufacturers of such systems are now developing optical cables and repeaters which will provide increased capacity at lower cost. This paper describes some of the aspects of the design requirements of cables suitable for

Peter Worthington

1984-01-01

326

Cable Design for Optical Submarine Systems  

Microsoft Academic Search

Transoceanic communication systems using coaxial cables with repeaters have been in use since the 1950's and there is now a very extensive international network. All major manufacturers of such systems are now developing optical cables and repeaters which will provide increased capacity at lower cost. This paper describes some of the aspects of the design requirements of cables suitable for

P. Worthington

1984-01-01

327

Assessing Deterioration of ADSS Fiber Optic Cables  

E-print Network

Introduction 19 II The electrical environment 20 III Electromagnetic compatibility modeling 21 IV. In a polluted environment, dry-band arcing causes cable deterioration when fog or dew occasionally wet the cable Electromagnetic model transformation 23 V Effects of pollution on fiber optic cable sheath 26 VI Pollution level

328

Application considerations for HTSC power transmission cables  

NASA Astrophysics Data System (ADS)

The Electric Power transmission infrastructure is described to establish a background to examine the potential for applications of underground transmission cables using HTSC materials. Near-term and farther out scenarios are identified that could become niches for this type of cable system. Two design concepts for AC cables are presented and discussed in relation to historical systems that were proposed with LTSC materials.

Engelhardt, John S.; Von Dollen, Donald; Samm, Ralph

1992-04-01

329

Analysis of Surveyor 3 television cable after residence on the moon  

NASA Technical Reports Server (NTRS)

The Apollo 12 astronauts brought the Surveyor III television camera back from the moon in November 1969. Chemical analyses of a portion of television cable revealed changes in the glass fabric sleeve and in the wire insulation as a result of exposure to the lunar environment. Loss of volatile constituents from the glass fabric and a discoloration of the glass occurred. The Teflon layer on the wire showed a slight discoloration and possibly a slight change in its infrared spectrum. Both the polyimide layer and the Teflon layer of the wire insulation showed changes in tensile strength and elongation.

Gross, F. C.; Park, J. J.

1972-01-01

330

Effects of manufacturing technology on electrical breakdown and morphology of thin films of low density polyethylene blended with polypropylene copolymer  

Microsoft Academic Search

Extruded films prepared from blends of low-density polyethylene (LDPE) and random copolymer of ethylene and propylene (EP) with the T-die method were studied with respect to electrical properties and morphology. Comparisons with data on blown films are made. These blends are of interest as improved LDPE for making XLPE for insulated power cable. In the high temperature region (90°C), a

Chao Zhang; Tatsuo Mori; Teruyoshi Mizutani; M. Ishioka

2003-01-01

331

Faster Test for Cable Seals  

NASA Technical Reports Server (NTRS)

Vacuum-assisted immersion test is much faster than conventional atmospheric immersion tests of cable seals. Vacuum speeds removal of air, allowing its replacement by conductive salt solution in leaking specimens. Previously, 24-hour immersion was necessary to assure displacement of trapped air. Improved method takes only 10 minutes.

Shephard, A. T.

1982-01-01

332

300 Area signal cable study  

SciTech Connect

This report was prepared to discuss the alternatives available for removing the 300 Area overhead signal cable system. This system, installed in 1969, has been used for various monitoring and communication signaling needs throughout the 300 Area. Over the years this cabling system has deteriorated, has been continually reconfigured, and has been poorly documented to the point of nonreliability. The first step was to look at the systems utilizing the overhead signal cable that are still required for operation. Of the ten systems that once operated via the signal cable, only five are still required; the civil defense evacuation alarms, the public address (PA) system, the criticality alarms, the Pacific Northwest Laboratory Facilities Management Control System (FMCS), and the 384 annunciator panel. Of these five, the criticality alarms and the FMCS have been dealt with under other proposals. Therefore, this study focused on the alternatives available for the remaining three systems (evacuation alarms, PA system, and 384 panel) plus the accountability aid phones. Once the systems to be discussed were determined, then three alternatives for providing the signaling pathway were examined for each system: (1) re-wire using underground communication ducts, (2) use the Integrated Voice/Data Telecommunications System (IVDTS) already installed and operated by US West, and (3) use radio control. Each alternative was developed with an estimated cost, advantages, and disadvantages. Finally, a recommendation was provided for the best alternative for each system.

Whattam, J.W.

1994-09-15

333

Digital Transmission over Submarine Cables  

Microsoft Academic Search

The problems of transoceanic transmission of large volumes of information have been raised increasingly over the past few years. Lately, the need for transoceanic digital communications has been of interest. This paper discusses the significance of these trends and examines the technical prospects for handling large volumes of digital traffic using submarine cables. Concentrating on transatlantic traffic, an argument is

W. Litchman

1965-01-01

334

Interactive Cable Television. Final Report.  

ERIC Educational Resources Information Center

This report describes an interactive video system developed by Active Learning Systems which utilizes a cable television (TV) network as its delivery system to transmit computer literacy lessons to high school and college students. The system consists of an IBM PC, Pioneer LDV 4000 videodisc player, and Whitney Supercircuit set up at the head end…

Active Learning Systems, Inc., Minneapolis, MN.

335

ALOHA Cabled Observatory: Early Results  

NASA Astrophysics Data System (ADS)

The ALOHA Cabled Observatory (ACO) was installed 6 June 2011, extending power, network communications and timing to a seafloor node and instruments at 4726 m water depth 100 km north of Oahu. The system was installed using ROV Jason operated from the R/V Kilo Moana. Station ALOHA is the field site of the Hawaii Ocean Time-series (HOT) program that has investigated temporal dynamics in biology, physics, and chemistry since 1988. HOT conducts near monthly ship-based sampling and makes continuous observations from moored instruments to document and study climate and ecosystem variability over semi-diurnal to decadal time scales. The cabled observatory system will provide the infrastructure for continuous, interactive ocean sampling enabling new measurements as well as a new mode of ocean observing that integrates ship and cabled observations. The ACO is a prototypical example of a deep observatory system that uses a retired first-generation fiber-optic telecommunications cable. Sensors provide live video, sound from local and distant sources, and measure currents, pressure, temperature, and salinity. Preliminary results will be presented and discussed.

Howe, B. M.; Lukas, R.; Duennebier, F. K.

2011-12-01

336

Superconducting cables: Long distance energy transmission. (Latest citations from the NTIS bibliographic database). Published Search  

SciTech Connect

The bibliography contains citations concerning the design, development, and evaluation of superconducting cables and power transmission lines for long distance energy transmission. Topics include methods of cryogenic refrigeration and electrical insulation, fabrication and development of niobium alloy conductors, energy loss analysis, and dielectric design of superconducting power transmission systems. Government research reports on superconducting technology for electric power transmission and distribution are also reviewed.(Contains 50-250 citations and includes a subject term index and title list.) (Copyright NERAC, Inc. 1995)

NONE

1996-02-01

337

Superconducting cables: Long distance energy transmission. (Latest citations from the NTIS bibliographic database). NewSearch  

SciTech Connect

The bibliography contains citations concerning the design, development, and evaluation of superconducting cables and power transmission lines for long distance energy transmission. Topics include methods of cryogenic refrigeration and electrical insulation, fabrication and development of niobium alloy conductors, energy loss analysis, and dielectric design of superconducting power transmission systems. Government research reports on superconducting technology for electric power transmission and distribution are also reviewed. (Contains a minimum of 106 citations and includes a subject term index and title list.)

Not Available

1994-11-01

338

Superconducting cables: Long distance energy transmission. (Latest citations from the NTIS Bibliographic database). Published Search  

SciTech Connect

The bibliography contains citations concerning the design, development, and evaluation of superconducting cables and power transmission lines for long distance energy transmission. Topics include methods of cryogenic refrigeration and electrical insulation, fabrication and development of niobium alloy conductors, energy loss analysis, and dielectric design of superconducting power transmission systems. Government research reports on superconducting technology for electric power transmission and distribution are also reviewed. (Contains a minimum of 105 citations and includes a subject term index and title list.)

Not Available

1993-12-01

339

Superconducting cables: Long distance energy transmission. (Latest citations from the NTIS bibliographic database). Published Search  

SciTech Connect

The bibliography contains citations concerning the design, development, and evaluation of superconducting cables and power transmission lines for long distance energy transmission. Topics include methods of cryogenic refrigeration and electrical insulation, fabrication and development of niobium alloy conductors, energy loss analysis, and dielectric design of superconducting power transmission systems. Government research reports on superconducting technology for electric power transmission and distribution are also reviewed.(Contains 50-250 citations and includes a subject term index and title list.) (Copyright NERAC, Inc. 1995)

NONE

1997-06-01

340

Superconducting cables: Long distance energy transmission. (Latest citations from the NTIS bibliographic database). Published Search  

SciTech Connect

The bibliography contains citations concerning the design, development, and evaluation of superconducting cables and power transmission lines for long distance energy transmission. Topics include methods of cryogenic refrigeration and electrical insulation, fabrication and development of niobium alloy conductors, energy loss analysis, and dielectric design of superconducting power transmission systems. Government research reports on superconducting technology for electric power transmission and distribution are also reviewed. (Contains a minimum of 105 citations and includes a subject term index and title list.)

Not Available

1993-08-01

341

Low smoke, non-corrosive, fire retardant cable jackets based on HNBR and EVM  

SciTech Connect

This article examines the properties of the polymers HNBR and EVM which make them good candidates for use in meeting the low smoke, non-corrosive, low toxicity and fire retardant requirements for electric safety cable jackets and electric insulation. Topics of the article include density, weight, and viscosity of each polymer, mechanical proprieties of each polymer, and other results of laboratory testing of these polymers.

Meisenheimer, H.

1991-06-01

342

Semiactive Damping of Cables with Sag  

NSDL National Science Digital Library

Vibrations in support cables can be caused by wind, rain, or other forces acting on the attached structure. This can result in premature failure of the cable or its connections, thereby reducing the cable's useful lifetime. This research paper, from the University of Southern California civil engineering department, extends the previous work of the authors on smart vibration damping techniques. Through accurate modeling of the cable and including the properties of "sag, inclination, and axial flexibility," a series of equations are derived that govern the motion of the cable. These are then used to show the effectiveness of semiactive dampers in reducing vibration.

Christenson, R. E.; Johnson, E. A.; Spencer, B. F.

343

Self-healing cable apparatus and methods  

NASA Technical Reports Server (NTRS)

Self-healing cable apparatus and methods are disclosed. The cable has a central core surrounded by an adaptive cover that can extend over the entire length of the cable or just one or more portions of the cable. The adaptive cover includes a protective layer having an initial damage resistance, and a reactive layer. When the cable is subjected to a localized damaging force, the reactive layer responds by creating a corresponding localized self-healed region. The self-healed region provides the cable with enhanced damage resistance as compared to the cable's initial damage resistance. Embodiments of the invention utilize conventional epoxies or foaming materials in the reactive layer that are released to form the self-healed region when the damaging force reaches the reactive layer.

Huston, Dryver (Inventor); Esser, Brian (Inventor)

2007-01-01

344

Aging analyses of aircraft wire insulation  

SciTech Connect

Over the past two decades, Sandia has developed a variety of specialized analytical techniques for evaluating the long-term aging and stability of cable insulation and other related materials. These techniques have been applied to cable reliability studies involving numerous insulation types and environmental factors. This work has allowed the monitoring of the occurrence and progression of cable material deterioration in application environments, and has provided insights into material degradation mechanisms. It has also allowed development of more reliable lifetime prediction methodologies. As a part of the FAA program for intrusive inspection of aircraft wiring, they are beginning to apply a battery of techniques to assessing the condition of cable specimens removed from retired aircraft. It is anticipated that in a future part of this program, they may employ these techniques in conjunction with accelerated aging methodologies and models that the authros have developed and employed in the past to predict cable lifetimes. The types of materials to be assessed include 5 different wire types: polyimide, PVC/Glass/Nylon, extruded XL-polyalkene/PVDF, Poly-X, and XL-ETFE. This presentation provides a brief overview of the main techniques that will be employed in assessing the state of health of aircraft wire insulation. The discussion will be illustrated with data from their prior cable aging studies, highlighting the methods used and their important conclusions. A few of the techniques that they employ are widely used in aging studies on polymers, but others are unique to Sandia. All of their techniques are non-proprietary, and maybe of interest for use by others in terms of application to aircraft wiring analysis. At the end of this report is a list showing some leading references to papers that have been published in the open literature which provide more detailed information on the analytical techniques for elastomer aging studies. The first step in the investigation of aircraft wiring is to evaluate the applicability of their various techniques to aircraft cables, after which they expect to identify a limited subset of techniques which are appropriate for each of the major aircraft wiring types. The techniques of initial interest in the studies of aging aircraft wire are as follows: optical microscopy; mandrel bend test; tensile test/elongation at break; density measurements; modulus profiling/(spatially-resolved micro-hardness); oxygen induction time/oxygen induction temperature (by differential scanning calorimetry); solvent-swelling/gel fraction; infrared spectroscopy (with chemical derivatization as warranted); chemiluminescence; thermo-oxidative wear-out assessment; The first two techniques are the simplest and quickest to apply; those further down the list tend to be more information rich and in some cases more sensitive, but also generally more specialized and more time consuming to run. Accordingly, the procedure will be to apply the simplest tests for purposes of preliminary screening of large numbers of samples. For any given material type, it can be expected that only a limited number of the other techniques will prove to be useful, and therefore, the more specialized techniques will be used on a limited number of selected samples. Samples of aircraft wiring have begun to be released to the authors in late April; they include in this report some limited and preliminary data on these materials.

GILLEN,KENNETH T.; CLOUGH,ROGER LEE; CELINA,MATHIAS C.; AUBERT,JAMES H.; MALONE,G. MICHAEL

2000-05-08

345

A 3D numerical model study for superconducting cable pattern  

Microsoft Academic Search

The superconductor cable with multi-stage twisted strands is the main component of ITER conductor. The pattern of cable is essential for the performance of cabling and conductor. This paper proposes a 3D model to describe the pattern of the cable accurately. The current model gives approximate simulation of strands, sub-cables, sub-cable wraps and cross-section of every stage of the cable.

Jinggang Qin; Yu Wu

2010-01-01

346

High Voltage Testing of a 5-meter Prototype Triaxial HTS Cable  

SciTech Connect

High voltage tests were performed on a 5-m long prototype triaxial HTS cable (supplied by Ultera) at ORNL in preparation for installation of a 200-m HTS cable of the same design at the AEP utility substation in Columbus, Ohio. The triaxial design comprises three concentric phases and shield around a common former with the phase to phase dielectric at cryogenic temperature. Advantages of this design include increased current density, a reduced amount of HTS tape needed, and reduced heat load. The phase to phase voltage will be 13.2 kVrms (7.6 kVrms to ground). Preliminary testing was done on half-scale and full-scale terminations which successfully passed AC withstand, partial discharge, and impulse tests. High voltage tests conducted on the 5-m cable with the cable straight and after bending 90 degrees were ac withstand to 39 kVrms, partial discharge inception, and a minimum of 10 positive and 10 negative lightning waveform impulses at 110 kV. Phase to phase insulation was tested by applying high voltage to each phase one at a time with all the other phases grounded. Partial discharge data will be presented. The 5-m prototype triaxial HTS cable passed all the HV tests performed, with a PD inception voltage significantly above the required voltage.

Sauers, Isidor [ORNL; James, David Randy [ORNL; Ellis, Alvin R [ORNL; Tuncer, Enis [ORNL; Pace, Marshall O [ORNL; Gouge, Michael J [ORNL; Demko, Jonathan A [ORNL; Lindsay, David T [ORNL

2007-01-01

347

Transient thermal analysis of a tri-axial HTS cable on fault current condition  

NASA Astrophysics Data System (ADS)

High-temperature superconducting (HTS) tri-axial cable, which consists of three concentric phases, was developed as a potential commercial solution for next generation distribution power network. In our previous research, we simulate the transient thermal behavior of the cable by solving the heat equation using one-dimension difference method. The result shows that it takes time to recover the cable temperature to the steady-state operation level due to a low thermal conductivity of the insulation layer after a fault. However for a long cable system, when middle phase in concentric structure is rated under an over current, accumulated heat from middle phase might continually warm up the liquid nitrogen (LN2) flow by heat transfer even the over current has been stopped. In this research, we improve the numerically calculation which includes the consideration of flowing liquid nitrogen and the heat transfer in both radius and longitudinal directions. A long tri-axial cable system thermal stability is discussed based on the calculation results.

Hu, N.; Cao, K.; Wang, D.; Song, M.; Miyagi, D.; Tsuda, M.; Hamajima, T.

2013-11-01

348

Topological Insulators & Superconductors  

E-print Network

Topological Insulators & Superconductors New Frontiers in Low-Dimensional Systems Program 3-5 November 2010 Jadwin Hall, Fourth Floor, Room 407 Topological Insulators and Superconductors have quickly insulators but have holographic edge or surface states which are robust to disorder and impurities

349

Mott Metal Insulator Transitions  

E-print Network

Physics Letters 95, no. 4 (2009) 14 #12;Mott Insulators: Actuators Bimorph Actuators Thermal Sensing LiuMott Metal Insulator Transitions Satej Soman, Robert Tang-Kong March 21, Physics 141A 1 #12;Definitions: What is a Mott Insulator? Metal that stops conducting at low temperature or high pressure

Budker, Dmitry

350

Vacuum insulator coating development  

Microsoft Academic Search

The authors discuss the electrical and mechanical requirements for vacuum insulators in high peak power generators. To increase the lifetime of these insulators, they have developed a coating called Dendresist. This coating has extended the insulator lifetime on the PITHON, DM2, CASINO, and Double-EAGLE pulsed power generators. They describe its development, and compare its electrical and mechanical strength to that

I. S. Roth; P. S. Sincerny; L. Mandelcorn; M. Mendelsohn; D. Smith; T. G. Engel; L. Schlitt; C. M. Cooke

1997-01-01

351

New Life For The Cable Cars  

NASA Technical Reports Server (NTRS)

NASA-Arnes' major recommendations involved ways of extending cable life in the interests of safety and economy. Other recommendations included redesign of the cablegripping device, substitution of modern braking mechanisms, improvements in cable pulleys and other components, and new inspection and repair procedures. Ames followed up by designing and installing new equipment to lengthen cable life, which averages only about two months. These cables-four of them for four different car routes--are endless belts, like ski lift cables, running from the downtown car barn to the end of each line. When a cable is installed, the loop is closed by splicing the ends together in a 72-footlong splice. The splice is the weakest part of the cable and a source of problems. When the car operator applies his grip while over a splice, the resulting friction sometimes causes the splice to "unbraid" and fail; this means shutting down the line until the splice can be repaired. Even when unbraiding does not occur, gripping a splice shortens cable life by friction wear. Worn cables are a safety hazard and must be replaced, which is expensive at $1.60 a foot for 10,000 to 20,000 feet of cable.

1979-01-01

352

Electrical and thermal characterization of a novel high pressure gas cooled DC power cable  

NASA Astrophysics Data System (ADS)

High-temperature superconductors (HTS) allow power cables of substantially higher current density than conventional copper or aluminum cables. This is important for applications where a low mass and a low volume are critical such as naval, aeronautical and space applications. The novel type of cable under consideration is cooled by gaseous Helium at elevated pressure. Helium is known for having poor electric breakdown strength; therefore the dielectric capabilities of this type of cable must be tested under conditions similar to the envisaged operation. In order to study the dielectric performance we have designed and built a novel high pressure cryostat rated at 2.17 MPa which has been used for testing model cables of lengths of up to 1 m. The cryostat is an open system where the gas is not re-circulated. This allows maintaining a high purity of the gas. The target temperature range is between 40 K and 70 K. This substantially increases the critical current density of the HTS compared to 77 K, which is the typical temperature of cables cooled by liquid Nitrogen. The cryostat presented allows for adjusting the temperature and keeping it constant for the time necessary to run a complete dielectric characterization test. We give a detailed description of the cryostat. Measurements of partial discharge inception voltages as well as the temperature distribution along the model cables as a function of time are presented. Tests showed that the thermal insulation characteristics of this cryostat were sufficient for the dielectric tests of up to 1 h duration. The partial discharge inception voltage (PDIV) of the high voltage bushing was about 16 kV. These values are well within our design requirements.

Rodrigo, H.; Salmhofer, F.; Kwag, D. S.; Pamidi, S.; Graber, L.; Crook, D. G.; Ranner, S. L.; Dale, S. J.; Knoll, D.

2012-04-01

353

Mechanical Separation of Metallic Copper from Polymer-Insulated Copper Wire  

Microsoft Academic Search

It is very important to recycling of polymer-insulated copper wire to remove copper from the wire without any contamination. A rolling machine and a blender were used to separate and recover the copper wires from a polymer coated cable. In the experiment using a rolling machine, the recovery of copper was improved by an increase in the number of rolling

Seiji Yokoyama; Sakae Takeuchi; Nik Hisyamudin Bin Muhd Nor

2011-01-01

354

Cable damping effects on thin tubes  

SciTech Connect

There are many thin tubes in nuclear power plants. Thin tubes, which are vertically supported at the top, tend to have low natural frequency and low damping ability. They may respond strongly to severe earthquakes. If a cable is connected to the bottom end of the tube, it is expected that the cable will affect the tube's response characteristics, possibly and probably decreasing the response. Therefore, in order to clarify the problems, the authors established a typical thin-tube model and studied, experimentally and analytically, the suspended cable effect on tube response. The natural frequency of the model is approx. 1 Hz. The cable is connected to the bottom end of the tube and the other end is fixed on the upper support. The cable itself has very low natural frequency and extensive damping capability. Its vibration characteristics can be changed by changing cable conditions.

Naruse, K.; Watanabe, Y.; Ozaki, O.

1987-01-01

355

Initial tension loss in cerclage cables.  

PubMed

Cerclage cables, frequently used in the management of fractures and osteotomies, are associated with a high failure rate and significant loosening during surgery. This study compared the capacity to maintain tension of different types of orthopaedic cable systems. Multifilament Cobalt-Chrome (CoCr) cables with four different crimp/clamp devices (DePuy, Stryker, Zimmer and Smith&Nephew) and one non-metallic Nylon (Ny) cable from Kinamed were instrumented with a load cell to measure tension during insertion. Significant tension loss was observed with crimping for all cables (P<0.05). Removing the tensioner led to an additional unexpected tension loss (CoCr-DePuy: 18%, CoCr-Stryker: 29%, CoCr-Smith&Nephew: 33%, Ny: 46%, and CoCr-Zimmer: 52%). The simple CoCr (DePuy) cable system outperformed the more sophisticated locking devices due to its significantly better ability to prevent tension loss. PMID:23618753

Ménard, Jérémie; Émard, Maxime; Canet, Fanny; Brailovski, Vladimir; Petit, Yvan; Laflamme, George Y

2013-10-01

356

Cryogenic Insulation Systems  

NASA Technical Reports Server (NTRS)

The results of a comparative study of cryogenic insulation systems performed are presented. The key aspects of thermal insulation relative to cryogenic system design, testing, manufacturing, and maintenance are discussed. An overview of insulation development from an energy conservation perspective is given. Conventional insulation materials for cryogenic applications provide three levels of thermal conductivity. Actual thermal performance of standard multilayer insulation (MLI) is several times less than laboratory performance and often 10 times worse than ideal performance. The cost-effectiveness of the insulation system depends on thermal performance; flexibility and durability; ease of use in handling, installation, and maintenance; and overall cost including operations, maintenance, and life cycle. Results of comprehensive testing of both conventional and novel materials such as aerogel composites using cryostat boil-off methods are given. The development of efficient, robust cryogenic insulation systems that operate at a soft vacuum level is the primary focus of this paper.

Augustynowicz, S. D.; Fesmire, J. E.; Wikstrom, J. P.

1999-01-01

357

Advances in ported coaxial cable technology  

Microsoft Academic Search

Ported coaxial cable sensors for outdoor intrusion detection have been commercially available since the late 1970's. Also known as “leaky cable” and “guided radar” sensors, the technology uses buried leaky coaxial cables to establish a terrain-following covert detection zone. By operating in the Very High Frequency (VHF) band, these sensors operate under all-weather conditions and have superior detection and false\\/nuisance

R. W. Clifton; B. G. Rich; I. A. Newcomb

1997-01-01

358

Whale Entanglements With Submarine Telecommunication Cables  

Microsoft Academic Search

Before 1955-1966, 16 instances of whale entanglement with submarine telegraphic cables were reported in the scientific literature. Here we present new information, derived from global cable fault databases, that reveals an absence of whale entanglements since 1959. This cessation coincided with the transition from telegraphic to coaxial telecommunication cables followed by the change to fiber-optic systems in the 1980s. We

Matthew Peter Wood; Lionel Carter

2008-01-01

359

The Long Island Sound submarine cable interconnection  

Microsoft Academic Search

This article discusses the design and installation of a 300-MVA, 19-km, 138-kV, high-pressure, oil-filled submarine cable for spanning the Long Island Sound between Norwalk, Conn., and Northport, N.Y. The use of self-contained, oil-filled cable for this crossing represents a major contribution in the field of cable technology. This long-desired intertie became a reality with the development of new low-viscosity impregnants¿capable

P. Gazzana-Priaroggia; J. H. Piscioneri; S. W. Margolin

1971-01-01

360

21 CFR 890.1175 - Electrode cable.  

Code of Federal Regulations, 2010 CFR

...AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES PHYSICAL MEDICINE DEVICES Physical Medicine Diagnostic Devices § 890.1175 Electrode cable. (a) Identification. An electrode...

2010-04-01

361

Capacitor discharge process for welding braided cable  

DOEpatents

A capacitor discharge process for welding a braided cable formed from a plurality of individual cable strands to a solid metallic electrically conductive member comprises the steps of: (a) preparing the electrically conductive member for welding by bevelling one of its end portions while leaving an ignition projection extending outwardly from the apex of the bevel; (b) clamping the electrically conductive member in a cathode fixture; (c) connecting the electrically conductive member clamped in the cathode fixture to a capacitor bank capable of being charged to a preselected voltage value; (d) preparing the braided cable for welding by wrapping one of its end portions with a metallic sheet to form a retaining ring operable to maintain the individual strands of the braided cable in fixed position within the retaining ring; (e) clamping the braided cable and the retaining ring as a unit in an anode fixture so that the wrapped end portion of the braided cable faces the ignition projection of the electrically conductive member; and (f) moving the cathode fixture towards the anode fixture until the ignition projection of the electrically conductive member contacts the end portion of the braided cable thereby allowing the capacitor bank to discharge through the electrically conductive member and through the braided cable and causing the electrically conductive member to be welded to the braided cable via capacitor discharge action.

Wilson, Rick D. (Corvallis, OR)

1995-01-01

362

Analysis of Bounded Cable Tensions in Cable-Actuated Parallel Manipulators  

Microsoft Academic Search

Cable-actuated parallel manipulators (CPMs) rely on cables instead of rigid links to manipulate the moving platform in the taskspace. Upper and lower bounds imposed on the cable ten- sions limit the force capability in CPMs and render certain forces infeasible at the end effector. This paper presents a geometrical analysis of the problems to 1) determine whether a CPM is

Mahir Hassan; Amir Khajepour

2011-01-01

363

A cable twisting model and its application in CSIC multi-stage cabling structure  

Microsoft Academic Search

The ITER conductor is made of a superconductor cable with multi-stage twisted strands. The spatial structure of such a cable is essential for understanding the effect of load and strain on the performance of a superconducting cable. Unfortunately, there have no analytical models so far to describe accurately such twisted spatial structure. This paper proposes a twisting matrix model to

Jun Feng

2009-01-01

364

Concept for the intrinsic dielectric strength of electrical insulation materials  

SciTech Connect

A concept is described for a possible definition of the intrinsic dielectric strength of insulating materials, which can be considered as a fundamental material property similar to other material properties, such as Young's modulus, index of refraction, and expansion coefficients. The events leading to the recognition of this property are reported, and the property is defined. This intrinsic dielectric strength concept should facilitate interpretation of results from accelerated and/or natural aging programs intended to predict electrical insulation service life of encapsulants in photovoltaic modules. As a practical application, this new concept enabled a possible explanation of the cause of failures in buried high-voltage cables with polyethylene insulation, and a possible explanation of the causes of electrical trees in polyethylene; these also are described.

Cuddihy, E.F.

1985-04-15

365

Insulated tank base and insulated block  

Microsoft Academic Search

Rockwell International Corp.'s improved insulated base design for a cryogenic-liquid storage tank offers high compressive strength and low thermal conductivity, is unaffected by moisture, and is readily fabricated, transported, and installed. The base is constructed of layers of insulation blocks consisting of 20 x 40 x 4 in. closed paperboard boxes with vertical divider panels forming a load-bearing grid within

E. T. Hillberg; L. Isenberg

1974-01-01

366

POTS to broadband ... cable modems.  

PubMed

There have been 3 columns talking about broadband communications and now at the very end when it's time to compare using a telco or cableco, I'm asking does it really matter? So what if I can actually get the whole 30 Mbps with a cable network when the website I'm connecting to is running on an ISDN line at 128 Kbps? Broadband offers a lot more bandwidth than the connections many Internet servers have today. Except for the biggest websites, many servers connect to the Internet with a switched 56-Kbps, ISDN, or fractional T1 line. Even with the big websites, my home network only runs a 10 Mbps Ethernet connection to my cable modem. Maybe it doesn't matter that the cable lines are shared or that I can only get 8 Mbps from an ADSL line. Maybe the ISP that I use has a T1 line connection to the Internet so my new ADSL modem has a fatter pipe than my provider! (See table 1). It all makes me wonder what's in store for us in the future. PC technology has increased exponentially in the last 10 years with super fast processor speeds, hard disks of hundreds of gigabytes, and amazing video and audio. Internet connection speeds have failed to keep the same pace. Instead of hundreds of times better or faster--modem speeds are barely 10 times faster. Broadband connections offer some additional speed but still not comparable growth as broadband connections are still in their infancy. Rather than trying to make use of existing communication paths, maybe we need a massive infrastructure makeover of something new. How about national wireless access points so we can connect anywhere, anytime? To use the latest and fastest wireless technology you will simply need to buy another $9.95 WLAN card or download the latest super slick WLAN compression/encryption software. Perhaps it is time for a massive infra-restructuring. Consider the past massive infrastructure efforts. The telcos needed to put in their wiring infrastructure starting in the 1870s before telephones were useful to the masses. CATV was a minor player in the TV broadcast business before they installed their cabling infrastructure and went national. Even automobiles were fairly useless until roads were paved and the highway infrastructure was built! PMID:14699740

Kabachinski, Jeff

2003-01-01

367

30 CFR 75.817 - Cable handling and support systems.  

Code of Federal Regulations, 2010 CFR

...STANDARDS-UNDERGROUND COAL MINES Underground High-Voltage Distribution High-Voltage Longwalls § 75.817 Cable handling and...miners contacting the cables and to protect the high-voltage cables from...

2010-07-01

368

30 CFR 75.600 - Trailing cables; flame resistance.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 false Trailing cables; flame resistance. 75.600 Section 75...Cables § 75.600 Trailing cables; flame resistance. [Statutory Provisions...requirements established by the Secretary for flame-resistant...

2010-07-01

369

30 CFR 18.36 - Cables between machine components.  

...2014-07-01 2014-07-01 false Cables between machine components. 18.36 Section 18.36 ...Design Requirements § 18.36 Cables between machine components. (a) Cables between machine components shall have: (1)...

2014-07-01

370

30 CFR 18.36 - Cables between machine components.  

Code of Federal Regulations, 2011 CFR

...2011-07-01 2011-07-01 false Cables between machine components. 18.36 Section 18.36 ...Design Requirements § 18.36 Cables between machine components. (a) Cables between machine components shall have: (1)...

2011-07-01

371

30 CFR 18.36 - Cables between machine components.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 2010-07-01 false Cables between machine components. 18.36 Section 18.36 ...Design Requirements § 18.36 Cables between machine components. (a) Cables between machine components shall have: (1)...

2010-07-01

372

30 CFR 18.36 - Cables between machine components.  

Code of Federal Regulations, 2013 CFR

...2013-07-01 2013-07-01 false Cables between machine components. 18.36 Section 18.36 ...Design Requirements § 18.36 Cables between machine components. (a) Cables between machine components shall have: (1)...

2013-07-01

373

30 CFR 18.36 - Cables between machine components.  

Code of Federal Regulations, 2012 CFR

...2012-07-01 2012-07-01 false Cables between machine components. 18.36 Section 18.36 ...Design Requirements § 18.36 Cables between machine components. (a) Cables between machine components shall have: (1)...

2012-07-01

374

14 CFR 23.1365 - Electric cables and equipment.  

Code of Federal Regulations, 2013 CFR

... 2013-01-01 false Electric cables and equipment. 23...Equipment § 23.1365 Electric cables and equipment. (a) Each electric connecting cable must be of...would overheat in the event of circuit overload or fault must...

2013-01-01

375

14 CFR 23.1365 - Electric cables and equipment.  

Code of Federal Regulations, 2012 CFR

... 2012-01-01 false Electric cables and equipment. 23...Equipment § 23.1365 Electric cables and equipment. (a) Each electric connecting cable must be of...would overheat in the event of circuit overload or fault must...

2012-01-01

376

14 CFR 23.1365 - Electric cables and equipment.  

Code of Federal Regulations, 2010 CFR

... 2010-01-01 false Electric cables and equipment. 23...Equipment § 23.1365 Electric cables and equipment. (a) Each electric connecting cable must be of...would overheat in the event of circuit overload or fault must...

2010-01-01

377

14 CFR 23.1365 - Electric cables and equipment.  

... 2014-01-01 false Electric cables and equipment. 23...Equipment § 23.1365 Electric cables and equipment. (a) Each electric connecting cable must be of...would overheat in the event of circuit overload or fault must...

2014-01-01

378

14 CFR 23.1365 - Electric cables and equipment.  

Code of Federal Regulations, 2011 CFR

... 2011-01-01 false Electric cables and equipment. 23...Equipment § 23.1365 Electric cables and equipment. (a) Each electric connecting cable must be of...would overheat in the event of circuit overload or fault must...

2011-01-01

379

47 CFR 32.6426 - Intrabuilding network cable expense.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 false Intrabuilding network cable expense. 32.6426 Section...Accounts § 32.6426 Intrabuilding network cable expense. (a) This account...expenses associated with intrabuilding network cable. (b) Subsidiary record...

2010-10-01

380

ALA Statement on Cable Telecommunications Act of 1982.  

ERIC Educational Resources Information Center

Presents views of the American Library Association on the Cable Telecommunications Act of 1982, providing a brief overview of library involvement in cable television and endorsing amendments suggested by the National Federation of Local Cable Programmers. (EJS)

Cooke, Eileen D.

1982-01-01

381

47 CFR 76.612 - Cable television frequency separation standards.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 2011-10-01 false Cable television frequency separation standards. 76...SERVICES MULTICHANNEL VIDEO AND CABLE TELEVISION SERVICE Technical Standards § 76.612 Cable television frequency separation standards....

2011-10-01

382

47 CFR 76.403 - Cable television system reports.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 2011-10-01 false Cable television system reports. 76.403 Section...SERVICES MULTICHANNEL VIDEO AND CABLE TELEVISION SERVICE Forms and Reports § 76.403 Cable television system reports. The operator of...

2011-10-01

383

47 CFR 76.614 - Cable television system regular monitoring.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 false Cable television system regular monitoring. 76.614...SERVICES MULTICHANNEL VIDEO AND CABLE TELEVISION SERVICE Technical Standards § 76.614 Cable television system regular...

2010-10-01

384

47 CFR 76.614 - Cable television system regular monitoring.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 2011-10-01 false Cable television system regular monitoring. 76.614...SERVICES MULTICHANNEL VIDEO AND CABLE TELEVISION SERVICE Technical Standards § 76.614 Cable television system regular...

2011-10-01

385

47 CFR 76.612 - Cable television frequency separation standards.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 false Cable television frequency separation standards. 76...SERVICES MULTICHANNEL VIDEO AND CABLE TELEVISION SERVICE Technical Standards § 76.612 Cable television frequency separation standards....

2010-10-01

386

47 CFR 76.403 - Cable television system reports.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 false Cable television system reports. 76.403 Section...SERVICES MULTICHANNEL VIDEO AND CABLE TELEVISION SERVICE Forms and Reports § 76.403 Cable television system reports. The operator of...

2010-10-01

387

Topological insulators/Isolants topologiques An introduction to topological insulators  

E-print Network

Topological insulators/Isolants topologiques An introduction to topological insulators Introduction in the first Brillouin Zone, and their associated energies. In an insulator, an energy gap around the chemical topology, the insulator is called a topological insulator. We introduce this notion of topological order

Paris-Sud XI, Université de

388

Thermal insulating conformal blanket  

NASA Technical Reports Server (NTRS)

The conformal thermal insulating blanket may have generally rigid batting material covered by an outer insulating layer formed of a high temperature resistant woven ceramic material and an inner insulating layer formed of a woven ceramic fiber material. The batting and insulating layers may be fastened together by sewing or stitching using an outer mold layer thread fabricated of a high temperature resistant material and an inner mold layer thread of a ceramic fiber material. The batting may be formed to a composite structure that may have a firmness factor sufficient to inhibit a pillowing effect after the stitching to not more than 0.03 inch. The outer insulating layer and an upper portion of the batting adjacent the outer insulating layer may be impregnated with a ceramic coating material.

Barney, Andrea (Inventor); Whittington, Charles A (Inventor); Eilertson, Bryan (Inventor); Siminski, Zenon (Inventor)

2003-01-01

389

Metal-insulator transitions  

Microsoft Academic Search

Metal-insulator transitions are accompanied by huge resistivity changes, even over tens of orders of magnitude, and are widely observed in condensed-matter systems. This article presents the observations and current understanding of the metal-insulator transition with a pedagogical introduction to the subject. Especially important are the transitions driven by correlation effects associated with the electron-electron interaction. The insulating phase caused by

Masatoshi Imada; Atsushi Fujimori; Yoshinori Tokura

1998-01-01

390

A Simple Holographic Insulator  

E-print Network

We present a simple holographic model of an insulator. Unlike most previous holographic insulators, the zero temperature infrared geometry is completely nonsingular. Both the low temperature DC conductivity and the optical conductivity at zero temperature satisfy power laws with the same exponent, given by the scaling dimension of an operator in the IR. Changing a parameter in the model converts it from an insulator to a conductor with a standard Drude peak.

Eric Mefford; Gary T. Horowitz

2014-07-11

391

Simple holographic insulator  

NASA Astrophysics Data System (ADS)

We present a simple holographic model of an insulator. Unlike most previous holographic insulators, the zero temperature infrared geometry is completely nonsingular. Both the low temperature DC conductivity and the optical conductivity at zero temperature satisfy power laws with the same exponent, given by the scaling dimension of an operator in the IR. Changing a parameter in the model converts it from an insulator to a conductor with a standard Drude peak.

Mefford, Eric; Horowitz, Gary T.

2014-10-01

392

Multilayer Insulation Material Guidelines  

NASA Technical Reports Server (NTRS)

Multilayer Insulation Material Guidelines provides data on multilayer insulation materials used by previous spacecraft such as Spacelab and the Long-Duration Exposure Facility and outlines other concerns. The data presented in the document are presented for information only. They can be used as guidelines for multilayer insulation design for future spacecraft provided the thermal requirements of each new design and the environmental effects on these materials are taken into account.

Finckenor, M. M.; Dooling, D.

1999-01-01

393

Development of Japanese scientific cable technology  

Microsoft Academic Search

Japanese ocean science community has installed eight cabled observatories in Japanese water in the past. Japan started installing cabled observatories in the middle of 1970's for disaster mitigation as countermeasure to possible megathrust earthquake in the Tokai region, about 100 km away from Tokyo. Their first system composed of metal wires used frequency modulated signal transmission for carrying data acquired

H. Mikada; K. Asakawa

2008-01-01

394

Harmonic Sequence Impedance of Multiphase Underground Cables  

Microsoft Academic Search

This paper presents a new model of multiphase underground cables for the mrnputation of harmonic impedana. The unique features of this model indude explicit representation of the grounding configuration and terminal; substation grounds, and the distribution earth currents. A segmentation method is employcd to compute the cable and earth current distribution. Other properties of the model arc: (1) aaurate frequency

G. J. Cokkinides; A. P. Sakis Meliopoulos

1992-01-01

395

Experimental prediction of performance by superconducting cables  

NASA Technical Reports Server (NTRS)

Broken superconductor method of short sample testing makes possible the prediction of the performance of well cooled, stabilized, superconducting cable coils. It yields a field-versus-current curve for a short sample of cable. Plots are given for the superconductor and copper currents at various magnetic field strengths.

Brooks, J. M.; Purcell, J. R.

1969-01-01

396

AC losses of prototype HTS transmission cables  

Microsoft Academic Search

Since 1995 Southwire Company and Oak Ridge National Laboratory (ORNL) have jointly designed, built, and tested nine, 1 m long, high temperature superconducting (HTS) transmission cable prototypes. This paper summarizes the AC loss measurements of five of the cables not reported elsewhere, and compares the losses with each other and with theory developed by Dresner. Losses were measured with both

J. W. Lue; J. A. Demko; L. Dresner; R. L. Hughey; U. Sinha; J. C. Tolbert; S. K. Olsen

1999-01-01

397

Gold plating in submarine telephone cable repeaters  

Microsoft Academic Search

Thousands of miles of submarine telephone cables form an important and growing part of the world pattern of communications.\\u000a Repeaters every few miles along these cables maintain signal strengths, and many of the components in these repeaters are\\u000a gold plated to ensure freedom from deterioration or failure in service.

D. S. Girling

1973-01-01

398

Corona Considerations in Submarine Cable Communications Systems  

Microsoft Academic Search

Underwater repeatered telephone cable systems are series powered by high-voltage dc. Each repeater and equalizer contains a power separation filter (PSF) for extracting the dc current from the center conductor of the coaxial cable while allowing signal transmission. Corona discharges occurring across the high-voltage components are coupled through reactive components to the repeater's terminals. Each of the experimentally observed pulse

Earnest Franke

1974-01-01

399

The Mechanics of Highly-Extensible Cables  

NASA Astrophysics Data System (ADS)

The mechanics of highly extensible cables are studied numerically. The governing equations for the cable motion are reformulated using Euler parameters and we employ a nonlinear stress-strain relation. Also, bending-stiffness terms are included to ensure a well-posed problem when tension becomes very low. Thus, the singularity associated with Euler-angle formulation is removed and the model allows for shock formation, while it can accommodate zero or negative tension along the cable span. Implicit time integration and non-uniform grid along the cable are adopted for the numerical solution of the governing equations. The model is employed to investigate (1) the dynamical behaviour of the breaking and post-breaking of an initially taut cable; and (2) the dynamic response of a tethered near-surface buoy subject to wave excitation. For a breaking cable we find that the speed of snapback, which can have potentially catastrophic effects, is proportional to the initial strain level, but the principal parameter controlling the cable behaviour is the time it takes for the cable to fracture. In the case of a tethered buoy in waves, we find that beyond a threshold wave amplitude the system begins to exhibit first zero tension, then followed by snapping response, while the buoy performs chaotic motion.

Tjavaras, A. A.; Zhu, Q.; Liu, Y.; Triantafyllou, M. S.; Yue, D. K. P.

1998-06-01

400

The Selling of Cable Television 1972.  

ERIC Educational Resources Information Center

The 1972 Cable Television Marketing Workshop reviewed in depth a wide variety of marketing and public relations techniques as they pertain to cable television. The workshop was attended by representatives of commercial television systems throughout the United States; it was intended to disseminate the sales and marketing experience of those…

National Cable Television Association, Inc., Washington, DC.

401

Cable TV; Protecting Its Future in Education.  

ERIC Educational Resources Information Center

New developments on the technical aspects of cable television, coupled with the proposed Federal Communications Commission (FCC) rules and regulations governing the medium and the possibility of Congressional action in the field have set the stage for 1971 to become a pivotal year for cable television in education. The number of channels that can…

Association for Supervision and Curriculum Development, Washington, DC.

402

Crossed Wires; Cable Television in New Jersey.  

ERIC Educational Resources Information Center

Cable television (CATV) in New Jersey has been almost nonexistent: Because of the state's proximity to the major cities of New York and Philadelphia, there has been a scarcity of New Jersey-oriented news and public affairs programing. Cable television access, it is suggested, could fill this information gap in New Jersey if the state government…

Center for Analysis of Public Issues, Princeton, NJ.

403

Instruction: Cable and Slow-Scan. Workshop.  

ERIC Educational Resources Information Center

The Rockford Cable Project is an experimental program using two-way cable television to train firefighters in prefire planning. The instructional design calls for firefighters across the city to view videotapes simultaneously and respond to computerized questions via a specially-designed pushbutton terminal. The project provides for centralized…

Pachuta, Jack

404

Community Cable Television--Hungarian Perspectives.  

ERIC Educational Resources Information Center

This paper argues that, although community cable television is one of the most dynamic (although experimental) elements of the Hungarian media structure, it is well on its way toward institutionalization. It is suggested that whether community cable television is able to retain the spontaneity, innovativeness, and elasticity of its early days may…

Szekfu, Andras

405

Intermodal resonance of vibrating suspended cables  

Microsoft Academic Search

The weakly nonlinear free vibrations of a single suspended cable, or a coupled system of sus- pended cables, may be classified as gravity modes (no tension variations to leading order) and elasto-gravity modes (tension and vertical displacement equally important). It was found earlier (12) that the gravity mode (probably the most common type of vibration of relatively inelastic spans) does

Sjoerd W. Rienstra

2010-01-01

406

Proceedings of the Symposium on Cable Television.  

ERIC Educational Resources Information Center

The papers given at a symposium on cable television (CATV) are collected in this volume. The chairman of the symposium notes that "the phrase 'cable television' is not totally pertinent since we are talking about a wired-city concept that may encompass many services other than television." He prefers the term "broadband communications network,"…

Society of Motion Picture and Television Engineers, Inc., New York, NY.

407

Helium hydrodynamics of internally cooled cabled superconductors  

Microsoft Academic Search

Proper cooling of the entire volume of superconductor is a central problem in the design of large superconducting magnets. This thesis present the results of experimental and analytical investigations into the behavior of helium flowing in the internally cooled cabled superconductor geometry. Pressure-drop measurements were made on various internally cooled cabled-superconductor test sections with different void fractions, strand sizes, and

1991-01-01

408

47 CFR 32.2423 - Buried cable.  

Code of Federal Regulations, 2010 CFR

...cable as well as the cost of other material used in the construction of such plant. This account shall also include the cost of trenching for and burying cable run in conduit not classifiable to Account 2441, Conduit Systems. Subsidiary record...

2010-10-01

409

Social Media Television in Today's Cable Systems  

Microsoft Academic Search

The communication tools of the Internet and community tools of social networking have begun to transform the viewers' interaction with television. While many of these changes are seen as exclusive to Web video and direct to consumer television service offerings, these features can be supported on traditional cable television infrastructure. The cable television infrastructure offers the opportunity to deliver this

J. B. Carlucci

2010-01-01

410

Cable Television: Citizen Participation After the Franchise.  

ERIC Educational Resources Information Center

The Federal Communications Commission (FCC) has incorporated several allowances in its regulations pertaining to cable television. Some of these enable citizen groups and communities to intervene in the cable franchise after the final issuance in order to correct deficiencies in the franchising process and the administration of the franchise.…

Price, Monroe E.; Botein, Michael

411

The Social Effects of Cable Television.  

ERIC Educational Resources Information Center

Cable television illustrates the problems that can arise in exploiting a promising new technology to meet social needs. Cable operators' marketing procedures have emphasized improvement of the quality of reception from local broadcasting stations, increased programming choice by introduction of distant signals, and introduction of special pay…

Johnson, Leland L.

412

Cable Television: A Guide to Federal Regulations.  

ERIC Educational Resources Information Center

The federal laws and regulations that presently apply to cable television are comprehensively discussed in this lengthy report. The report has been designed as a guide and reference book for state and local officials, cable operators, and citizen groups. It presents a complete discussion of the 1972 Federal Communications Commission's (FCC) Report…

Rivkin, Steven R.

413

MIC - a self deploying magnetically inflated cable system for large scale space structures  

NASA Astrophysics Data System (ADS)

A new approach, termed MIC (Magnetically Inflated Cable) that enables large, lightweight very strong and rigid space structures is described. MIC would be launched as a compact package of coiled superconducting (SC) cables. After reaching orbit, the cables would be cryogenically cooled and electrically energized by a small power source. The resultant repulsion magnetic forces between the DC currents in the SC cables automatically cause the coiled launch package to self deploy into the final large space structure. The SC cables are held in place by a distributed network of high tensile strength tethers (e.g., Spectra material), creating a very stiff, rigid truss structure that strongly resists bending and torsional, etc. movements, without the need for gravity gradient stabilization. A linear quadrupole (LQ) MIC configuration is described that is suitable for large solar power satellites, space stations, space hotels, propellant tanks, manned Mars spacecraft, etc. The LQ has 2 long SC dipole loops, of horizontal width W, length L, and opposite magnetic polarity, which are vertically separated by distance W, producing a long truss structure of square cross-section (width W) with the 4 SC cables at the corners of the square. The SC currents are opposite in adjacent cables, yielding an outwardly directed net radial force on each cable. The ends of each SC loop experience outwards longitudinal forces. The magnetic forces are very strong, even for modest supercurrents. For example, a 4 meter square truss with I = 250 kiloamp has an outwards radial force of 220 kg per meter of cable. and 5250 kg outwards longitudinal force at the ends of each SC loop. The network of restraining tensile lines can support lightweight structures, including solar panels, propellant tankage, habitat modules, power transmission lines, etc. The design of a 1 kilometer long, 4 meter square cross section MIC truss for solar power satellites is described. The MIC launch package fits within the length/weight constraints of the shuttle bay, and includes all of the helium coolant lines, thermal insulation, and refrigeration equipment required.

Powell, James; Maise, George; Paniagua, John

2001-03-01

414

Theory of topological insulators  

NASA Astrophysics Data System (ADS)

An important goal of condensed matter physics is to search for new phases of matter. This thesis is about a new insulating phase. Traditionally an insulator is defined as a material that does not conduct electricity. In most insulators the absence of electrical conduction is explained by the band theory of solids---a triumph of quantum mechanics in the twentieth century. According to band theory, an insulator has an energy gap separating the conduction and valence bands. As a result, there is no low energy electronic states inside an insulator to accommodate a charge flow. In the past few years, a new kind of insulators has been theoretically predicted, which has a band structure that is topologically different from an ordinary insulator. For this reason, this new state is called a topological insulator. Despite having an energy gap in the bulk, a topological insulator has unique gapless states bound to the sample surface as a consequence of the topological order in the bulk. Recent experimental observations of these unique surface electron states have provided direct evidence of the topological insulator phase in a number of materials. In this thesis we present the theory of topological insulators. Specifically, we describe the mathematical formulation of the topological order of insulating band structures, which leads to the theoretical discovery of three-dimensional topological insulator phases. We also give the physical characterization of the topological order, thereby establishing that the hallmark signatures of topological insulators are the distinctive surface states. Unlike any other two dimensional metal, the surface of a topological insulator has unique properties giving rise to unusual phases. In particular, we show that depositing a superconductor on the surface leads, via proximity effect, to a novel superconducting state which hosts zero energy Majorana fermions. A Majorana fermion is theoretically defined as a particle that is its own anti-particle but has never been found in nature. Zero-energy Majorana fermions are predicted to have non-Abelian statistics which, if observed, will greatly advance our understanding of the fundamental principles of quantum statistics and open the door to potential quantum computation applications. We propose that the superconductor-topological insulator interface provides a new venue for observing Majorana fermions and their non-Abelian statistics.

Fu, Liang

415

Topological crystalline insulator nanostructures  

NASA Astrophysics Data System (ADS)

Topological crystalline insulators are topological insulators whose surface states are protected by the crystalline symmetry, instead of the time reversal symmetry. Similar to the first generation of three-dimensional topological insulators such as Bi2Se3 and Bi2Te3, topological crystalline insulators also possess surface states with exotic electronic properties such as spin-momentum locking and Dirac dispersion. Experimentally verified topological crystalline insulators to date are SnTe, Pb1-xSnxSe, and Pb1-xSnxTe. Because topological protection comes from the crystal symmetry, magnetic impurities or in-plane magnetic fields are not expected to open a gap in the surface states in topological crystalline insulators. Additionally, because they have a cubic structure instead of a layered structure, branched structures or strong coupling with other materials for large proximity effects are possible, which are difficult with layered Bi2Se3 and Bi2Te3. Thus, additional fundamental phenomena inaccessible in three-dimensional topological insulators can be pursued. In this review, topological crystalline insulator SnTe nanostructures will be discussed. For comparison, experimental results based on SnTe thin films will be covered. Surface state properties of topological crystalline insulators will be discussed briefly.

Shen, Jie; Cha, Judy J.

2014-11-01

416

Loose-fill insulations  

SciTech Connect

Whether you are increasing the insulation levels in your current home or selecting insulation for a new home, choosing the right insulation material can be challenging. Fibrous loose-fill insulations such as cellulose, fiberglass, and rock wool are options you may wish to consider. This publication will introduce you to these materials--what they are, how they are applied, how they compare with each other, and other considerations regarding their use--so that you can decide whether loose fills are right for your home.

NONE

1995-05-01

417

Composite Flexible Blanket Insulation  

NASA Technical Reports Server (NTRS)

Composite flexible multilayer insulation systems (MLI) were evaluated for thermal performance and compared with the currently used fibrous silica (baseline) insulation system. The systems described are multilayer insulations consisting of alternating layers of metal foil and scrim ceramic cloth or vacuum metallized polymeric films quilted together using ceramic thread. A silicon carbide thread for use in the quilting and the method of making it are also described. These systems are useful in providing lightweight insulation for a variety of uses, particularly on the surface of aerospace vehicles subject to very high temperatures during flight.

Kourtides, Demetrius A. (inventor); Pitts, William C. (inventor); Goldstein, Howard E. (inventor); Sawko, Paul M. (inventor)

1991-01-01

418

Alternator insulation evaluation tests  

NASA Technical Reports Server (NTRS)

Tests were conducted to predict the remaining electrical insulation life of a 60 KW homopolar inductor alternator following completion of NASA turbo-alternator endurance tests for SNAP-8 space electrical power systems application. The insulation quality was established for two alternators following completion of these tests. A step-temperature aging test procedure was developed for insulation life prediction and applied to one of the two alternators. Armature winding insulation life of over 80,000 hours for an average winding temperature of 248 degrees C was predicted using the developed procedure.

Penn, W. B.; Schaefer, R. F.; Balke, R. L.

1972-01-01

419

Numerical study on self-field losses of 30 m BSCCO HTS transmission cable  

NASA Astrophysics Data System (ADS)

The self-field losses of the one phase of high- T C superconducting (HTS) transmission cable are calculated by the electric circuit (EC) model. The one phase of HTS cable is constructed by the former of fine-strands copper rod, HTS conductor with four superconducting layers, the insulation made by polypropylene laminated paper, and HTS shielding with two superconducting layers, which was fabricated by Sumitomo Electric Industries (SEI). The length of the cable is 30 m. Each HTS layer comprises BSCCO tapes. The current-dependent resistance of HTS layers in EC model is estimated on the base of Norris expressions for ellipse. The calculated losses are compared with the experimental results measured by 4-terminal method by SEI. The calculation of alternating current (AC) losses, a summation of the self-field losses in HTS layers and the eddy-current losses in the former, is almost equal to the measurement at wide transport-current range below the lowest value of the layer critical current. This result indicates that the numerical calculation by EC model is quite reliable. The minimum AC loss is also calculated by obtaining the optimum helical-pitch lengths of HTS layers at transporting 1 kA rms. The minimum loss is 36% lower than the loss of HTS cable designed by SEI at the transport current value. In HTS cable with the optimum helical-pitch lengths, the calculation of the layer currents are not uniform in HTS conductor but are almost uniform in HTS shielding, which is contradict to SEI's one. It is considered that the numerical calculation by EC model is useful to obtain the optimum helical-pitch lengths in HTS cable with the minimum AC loss.

Noji, H.

2009-01-01

420

New Scientific Underwater Cable System Tokai-SCANNER for Underwater Geophysical Monitoring Utilizing a Decommissioned Optical Underwater Telecommunication Cable  

Microsoft Academic Search

We have developed a new cost-effective scientific underwater cable system named Tokai Submarine Cabled Network Observatory for Nowcast of Earthquake Recurrences (Tokai-SCANNER) using a decommissioned optical underwater telecommunication cable. We have used this cable in two ways simultaneously: (1) to construct an ocean-bottom observatory at the end of the cable, and (2) to use the cable as a long emitting

Kenichi Asakawa; Takashi Yokobiki; Tada-nori Goto; Eiichiro Araki; Takafumi Kasaya; Masataka Kinoshita; Junichi Kojima

2009-01-01

421

Counter-balanced, multiple cable construction crane  

NASA Technical Reports Server (NTRS)

The invention is a counter-balanced, multiple cable construction crane. The apparatus for hoisting payloads comprises a crane having a lifting means, the lifting means comprising an end effector means and three suspension means or cables. One end of each cable attaches to a different winding means located on the lifting means, and the other end of each cable attaches to a different point on the end effector, such that the three cables have a theoretical point of convergence with this point corresponding to the center of mass of the payload. Three controls command rotation of the winding means to a predetermined position. Accordingly, the crane provides precise and autonomous positioning of the payload without human guidance. The crane further comprises a counter-balancing means. Two controls position the counter-balancing means to offset the overturning moment which arises during the lifting of heavy payloads.

Mikulas, Martin M., Jr. (inventor); Yang, Li-Farn (inventor)

1993-01-01

422

Heat Transfer Measurements through Thermally Enhanced Insulation Schemes for Nb-Ti Superconducting Magnets operating in He-II  

E-print Network

Superconducting magnets submitted to large heat loads, as the low-? quadrupoles for the LHC luminosity upgrade, need the development of new concepts of cable electrical insulation featuring a He-II porous wrapping scheme. This paper reports and discusses recent results of dedicated heat transfer measurements performed on different variants of such schemes, with emphasis on the heat transfer enhancements achievable with respect to the state-of-the-art insulation used for the main LHC magnets.

Granieri, P P

2011-01-01

423

Colloquium: Topological insulators  

NASA Astrophysics Data System (ADS)

Topological insulators are electronic materials that have a bulk band gap like an ordinary insulator but have protected conducting states on their edge or surface. These states are possible due to the combination of spin-orbit interactions and time-reversal symmetry. The two-dimensional (2D) topological insulator is a quantum spin Hall insulator, which is a close cousin of the integer quantum Hall state. A three-dimensional (3D) topological insulator supports novel spin-polarized 2D Dirac fermions on its surface. In this Colloquium the theoretical foundation for topological insulators and superconductors is reviewed and recent experiments are described in which the signatures of topological insulators have been observed. Transport experiments on HgTe/CdTe quantum wells are described that demonstrate the existence of the edge states predicted for the quantum spin Hall insulator. Experiments on Bi1-xSbx , Bi2Se3 , Bi2Te3 , and Sb2Te3 are then discussed that establish these materials as 3D topological insulators and directly probe the topology of their surface states. Exotic states are described that can occur at the surface of a 3D topological insulator due to an induced energy gap. A magnetic gap leads to a novel quantum Hall state that gives rise to a topological magnetoelectric effect. A superconducting energy gap leads to a state that supports Majorana fermions and may provide a new venue for realizing proposals for topological quantum computation. Prospects for observing these exotic states are also discussed, as well as other potential device applications of topological insulators.

Hasan, M. Z.; Kane, C. L.

2010-10-01

424

CALIFORNIA ENERGY Ceiling Insulation Report  

E-print Network

CALIFORNIA ENERGY COMMISSION Ceiling Insulation Report: Effectiveness of Lay-In Ceiling Insulation Effectiveness of Lay-In Insulation (product 5.2.6) TECHNICALREPORT October 2003 500-03-082-A-14 Gray Davis

425

Development of a 10 m long 1 kA 66/77 kV YBCO HTS cable with low AC loss and a joint with low electrical resistance  

NASA Astrophysics Data System (ADS)

We have developed high-Tc superconducting (HTS) cables using YBCO tapes. A 10 mm-wide YBCO tape was divided into five strips using a YAG laser to reduce AC loss. A 0.3 m conductor and a 1 m conductor were fabricated achieving AC losses at 1 kArms and 50 Hz of 0.054 W m-1 and of 0.048 W m-1, respectively. Based on the successful AC loss reduction in the 0.3 and 1 m conductors, we fabricated a 10 m HTS cable with a three-layer HTS conductor, electrical insulation, and a one-layer HTS shield. The AC loss in this 10 m HTS conductor was 0.090 W m-1 at 1 kArms and 50 Hz. An HTS cable joint was designed and fabricated that included a three-layer HTS conductor and a one-layer HTS shield. Joint resistance of 5.2 n? for the HTS conductor and that of 10 n? for the HTS shield were achieved. The HTS cable joint was compact and had sufficient withstand voltage properties for 66/77 kV. In addition, we also confirmed the efficiency of joint construction. Moreover, a 20 m long HTS cable was successfully constructed and tested in January 2008. This HTS cable consisted of two 10 m HTS cables and the HTS cable joint. One 10 m HTS cable using HoBCO was made by Sumitomo, and the HTS cable joint and the other 10 m cable using IBAD YBCO were made by Furukawa and Chubu. The electrical resistance of the HTS cable joint was less than 10 n?, and the 20 m HTS cable including the joint withstood an over-current of 31.5 kArms whose duration was 2 s.

Yagi, Masashi; Mukoyama, Shinichi; Amemiya, Naoyuki; Kashima, Naoji; Nagaya, Shigeo; Shiohara, Yuh

2009-08-01

426

Insulation Fact Sheet.  

ERIC Educational Resources Information Center

Heating and cooling account for 50-70% of the energy consumed in the average American home. Heating water accounts for another 20%. A poorly insulated home loses much of this energy, causing drafty rooms and high energy bills. This fact sheet discusses how to determine if your home needs more insulation, the additional thermal resistance (called…

Conservation and Renewable Energy Inquiry and Referral Service (DOE), Silver Spring, MD.

427

Thermal Capacitance Perfect Insulator  

E-print Network

Thermal Capacitance C1 Perfect Insulator Thermal Resistance R1 R3 R2 C2 q Watts q - Temperature qa q2 q1 qb 1. Consider the thermal system shown below. a) Find an equivalent electrical circuit. b) Write out the necessary equations to solve for and .q q1 2 2. A small room is perfectly insulated

Hagan, Martin

428

Thermal insulation blanket material  

NASA Technical Reports Server (NTRS)

A study was conducted to provide a tailorable advanced blanket insulation based on a woven design having an integrally woven core structure. A highly pure quartz yarn was selected for weaving and the cells formed were filled with a microquartz felt insulation.

Pusch, R. H.

1982-01-01

429

Thermal insulation blanket material  

NASA Astrophysics Data System (ADS)

A study was conducted to provide a tailorable advanced blanket insulation based on a woven design having an integrally woven core structure. A highly pure quartz yarn was selected for weaving and the cells formed were filled with a microquartz felt insulation.

Pusch, R. H.

1982-06-01

430

On designing and building equipment for a wide-scale production of SC transposed cable for UNK  

SciTech Connect

In this paper the complex of equipment assigned for a wide-scale production of SC transposed cable (STC) for the UNK magnet system is described. The complex consists of composite superconductor twisting machines, control-rewinding machines, facilities for coating the superconductor with Sn+5% Ag layer, transposing machines, ultrasonic cleaning facilities, insulating machines and the one to impregnate the fiber glass tape with epoxide compound.

Borisov, E.R.; Surkov, A.N. (Inst. for High Energy Physics 142284, Protvino Moscow (SU))

1992-01-01

431

Applications of LIBS for determination of ionic species (NaCl) in electrical cables for investigation of electrical breakdown  

NASA Astrophysics Data System (ADS)

The formation of water trees in high-voltage cables can wreak havoc to power systems. The water tree is produced within the high voltage cable insulator when impurities like sodium and magnesium present in the insulating material react with moist soil to form chlorides. This water tree causes electrical breakdown by short circuiting the metallic conductor and the earth. In this paper we use laser-induced breakdown spectroscopy (LIBS) to detect the potentially dangerous elements that form the water tree in the insulating cable. The LIBS system used for this work consists of the fundamental (1064 nm) of a Nd:YAG laser, four spectrometer modules that cover the visible and near-UV spectral ranges and an ICCD camera with proper delay and gating sequence. With this arrangement we were able to measure the elemental concentrations of trace metals present in the insulating cable. The concentrations measured with our LIBS system were counter checked by a standard technique like inductively coupled plasma (ICP) emission spectrometry. The maximum concentrations for ionic species such as Ba (455.40 nm), Ca (393.36 nm), Cr (267.71 nm), Fe (259.94 nm), Cl (542.3 nm), Mg (516.7 nm), Mn (257.61 nm), Na (589.59 nm) and Ti (334.18 nm) are 20.6, 43.2, 1.6, 148.4, 24.2, 22.1, 4.2, 39.56 and 4.35 ppm, respectively. The relative accuracy of our LIBS system for various elements as compared with the ICP method is in the range of 0.03-0.6 at 2.5% error confidence.

Gondal, M. A.; Shwehdi, M. H.; Khalil, A. A. I.

2011-12-01

432

Mott-insulator dynamics  

NASA Astrophysics Data System (ADS)

The hydrodynamics of a lattice Bose gas in a time-dependent external potential is studied in a mean-field approximation. The conditions under which a Mott insulating region can melt, and the local density can adjust to the new potential, are determined. In the case of a suddenly switched potential, it is found that the Mott insulator stays insulating and the density will not adjust if the switch is too abrupt. This comes about because too rapid currents result in Bloch oscillation-type current reversals. For a stirrer moved through a Mott insulating cloud, it is seen that only if the stirrer starts in a superfluid region and the velocity is comparable to the time scale set by the tunneling will the Mott insulator be affected.

Lundh, Emil

2011-09-01

433

Dynamics insulation systems  

NASA Technical Reports Server (NTRS)

Advanced dynamic insulation systems were analyzed from a thermodynamic point of view. A particular performance measure is proposed in order to characterize various insulations in a unique manner. This measure is related to a base quantity, the refrigeration power ratio. The latter is the minimum refrigeration power, for a particular dynamic insulation limit, to the actual reliquefaction power associated with cryoliquid boiloff. This ratio serves as reference quantity which is approximately constant for a specific ductless insulation at a chosen normal boiling point. Each real container with support structure, vent tube, and other transverse components requires a larger refrigeration power. The ratio of the actual experimental power to the theoretical value of the support-less system is a suitable measure of the entire insulation performance as far as parasitic heat leakage is concerned. The present characterization is illustrated using simple thermodynamic system examples including experiments with liquid nitrogen. Numerical values are presented and a comparison with liquid helium is given.

Chen, W. E. W.; Hepler, W. A.; Yuan, S. W. K.; Frederking, T. H. K.

1985-01-01

434

Dynamics insulation systems  

SciTech Connect

Advanced dynamic insulation systems were analyzed from a thermodynamic point of view. A particular performance measure is proposed in order to characterize various insulations in a unique manner. This measure is related to a base quantity, the refrigeration power ratio. The latter is the minimum refrigeration power, for a particular dynamic insulation limit, to the actual reliquefaction power associated with cryoliquid boiloff. This ratio serves as reference quantity which is approximately constant for a specific ductless insulation at a chosen normal boiling point. Each real container with support structure, vent tube, and other transverse components requires a larger refrigeration power. The ratio of the actual experimental power to the theoretical value of the support-less system is a suitable measure of the entire insulation performance as far as parasitic heat leakage is concerned. The present characterization is illustrated using simple thermodynamic system examples including experiments with liquid nitrogen. Numerical values are presented and a comparison with liquid helium is given.

Chen, W.E.W.; Hepler, W.A.; Yuan, S.W.K.; Frederking, T.H.K.

1985-10-01

435

Breakdown of organic insulators  

NASA Astrophysics Data System (ADS)

Solar cells and their associated electrical interconnects and leads were encapsulated in transparent elastomeric materials. Their purpose in a photovoltaic module, one of the most important for these elastomeric encapsulation materials, is to function as electrical insulation. This includes internal insulation between adjacent solar cells, between other encapsulated electrical parts, and between the total internal electrical circuitry and external metal frames, grounded areas, and module surfaces. Catastrophic electrical breakdown of the encapsulant insulation materials or electrical current through these materials or module edges to external locations can lead to module failure and can create hazards to humans. Electrical insulation stability, advanced elastomeric encapsulation materials are developed which are intended to be intrinsically free of in-situ ionic impurities, have ultralow water absorption, be weather-stable (UV, oxygen), and have high mechanical flexibility. Efforts to develop a method of assessing the life potential of organic insulation materials in photovoltaic modules are described.

Cuddihy, E. F.

1983-11-01

436

Breakdown of organic insulators  

NASA Technical Reports Server (NTRS)

Solar cells and their associated electrical interconnects and leads were encapsulated in transparent elastomeric materials. Their purpose in a photovoltaic module, one of the most important for these elastomeric encapsulation materials, is to function as electrical insulation. This includes internal insulation between adjacent solar cells, between other encapsulated electrical parts, and between the total internal electrical circuitry and external metal frames, grounded areas, and module surfaces. Catastrophic electrical breakdown of the encapsulant insulation materials or electrical current through these materials or module edges to external locations can lead to module failure and can create hazards to humans. Electrical insulation stability, advanced elastomeric encapsulation materials are developed which are intended to be intrinsically free of in-situ ionic impurities, have ultralow water absorption, be weather-stable (UV, oxygen), and have high mechanical flexibility. Efforts to develop a method of assessing the life potential of organic insulation materials in photovoltaic modules are described.

Cuddihy, E. F.

1983-01-01

437

Cryogenic Insulation System  

NASA Technical Reports Server (NTRS)

This invention relates to reusable, low density, high temperature cryogenic foam insulation systems and the process for their manufacture. A pacing technology for liquid hydrogen fueled, high speed aircraft is the development of a fully reusable, flight weight cryogenic insulation system for propellant tank structures. In the invention cryogenic foam insulation is adhesively bonded to the outer wall of the fuel tank structure. The cryogenic insulation consists of square sheets fabricated from an array of abutting square blocks. Each block consists of a sheet of glass cloth adhesively bonded between two layers of polymethacrylimide foam. Each block is wrapped in a vapor impermeable membrane, such as Kapton(R) aluminum Kapton(R), to provide a vapor barrier. Very beneficial results can be obtained by employing the present invention in conjunction with fibrous insulation and an outer aeroshell, a hot fuselage structure with an internal thermal protection system.

Davis, Randall C. (inventor); Taylor, Allan H. (inventor); Jackson, L. Robert (inventor); Mcauliffe, Patrick S. (inventor)

1988-01-01

438

Self-healing cable for extreme environments  

NASA Technical Reports Server (NTRS)

Self-healing cable apparatus and methods disclosed. The self-healing cable has a central core surrounded by an adaptive cover that can extend over the entire length of the self-healing cable or just one or more portions of the self-healing cable. The adaptive cover includes an axially and/or radially compressible-expandable (C/E) foam layer that maintains its properties over a wide range of environmental conditions. A tape layer surrounds the C/E layer and is applied so that it surrounds and axially and/or radially compresses the C/E layer. When the self-healing cable is subjected to a damaging force that causes a breach in the outer jacket and the tape layer, the corresponding localized axially and/or radially compressed portion of the C/E foam layer expands into the breach to form a corresponding localized self-healed region. The self-healing cable is manufacturable with present-day commercial self-healing cable manufacturing tools.

Huston, Dryver R. (Inventor); Tolmie, Bernard R. (Inventor)

2009-01-01

439

Photoacoustic Detection of Perfluorocarbon Tracers in Air for Application to Leak Detection in Oil-Filled Cables  

NASA Astrophysics Data System (ADS)

The underground oil-filled cable consists of a hollow copper conductor surrounded by oiled paper which acts as electrical insulation. The oil flows along the conductor and diffuses through it to the insulating paper. A lead sheath is used as the outer retaining wall. As the deterioration of this cover may cause a loss of insulation fluid, its detection is very important since this high voltage and power cable is used in cities even under sidewalks. The method of perfluorocarbon vapor tracers, based on the injection and subsequent detection of these volatile chemical substances in the vicinity of the cable, is one of the most promising methods, so far used in combination with gas chromatography and mass spectrometry. In this study, the possibility of detecting two different tracers, and , by means of resonant photoacoustic spectroscopy is studied. The beam from a tunable amplitude-modulated laser goes through an aluminum cell with quarter wave filters at both ends of an open resonator and an electret microphone in its center, attached to the walls. The calibration of the system for either substance diluted in chromatographic air showed a higher sensitivity for , so the experiment was completed checking the behavior of this substance in samples prepared with ambient air in order to analyze the application of the system to field studies.

Zajarevich, N.; Slezak, V.; Peuriot, A.; Villa, G.; Láttero, A.; Crivicich, R.

2013-09-01

440

Multiconductor Short/Open Cable Tester  

NASA Technical Reports Server (NTRS)

Frequent or regular testing of multiconductor cables terminated in multipin conductors tedious, if not impossible, task. This inexpensive circuit simplifies open/short testing and is amenable to automation. In operation, pair of connectors selected to match pair of connectors installed on each of cables to be tested. As many connectors accommodated as required, and each can have as many conductors as required. Testing technique implemented with this circuit automated easily with electronic controls and computer interface. Printout provides status of each conductor in cable, indicating which, if any, of conductors has open or short circuit.

Eichenberg, Dennis

1994-01-01

441

BSCCO-2212 Wire and Cable Studies  

NASA Astrophysics Data System (ADS)

BSCCO-2212 round wires are being studied at Fermilab for possible use in accelerator magnets. Several billets were produced by OST with various fill factors in a diameter range between 0.7 mm and 1 mm. To allow for cabling the strands, a modified process was implemented as opposed to the regular process with oxygen anneal. Rutherford-type cables were fabricated and the performance of extracted strands was compared with that of virgin samples. Cables were also tested using a superconducting transformer.

Barzi, E.; Turrioni, D.; Kikuchi, A.; Lamm, M.; Rusy, A.; Yamada, R.; Zlobin, A. V.

2008-03-01

442

47 CFR 36.341 - Cable and wire facilities expenses-Account 6410 (Class B telephone companies); Accounts 6411...  

Code of Federal Regulations, 2012 CFR

...account includes the expenses for poles, antenna supporting structures, aerial cable, underground cable, buried cable, submarine cable, deep sea cable, intrabuilding network cable, aerial wire, and conduit systems. (b) The general method of...

2012-10-01

443

47 CFR 36.341 - Cable and wire facilities expenses-Account 6410 (Class B telephone companies); Accounts 6411...  

Code of Federal Regulations, 2011 CFR

...account includes the expenses for poles, antenna supporting structures, aerial cable, underground cable, buried cable, submarine cable, deep sea cable, intrabuilding network cable, aerial wire, and conduit systems. (b) The general method of...

2011-10-01

444

47 CFR 36.341 - Cable and wire facilities expenses-Account 6410 (Class B telephone companies); Accounts 6411...  

...account includes the expenses for poles, antenna supporting structures, aerial cable, underground cable, buried cable, submarine cable, deep sea cable, intrabuilding network cable, aerial wire, and conduit systems. (b) The general method of...

2014-10-01

445

47 CFR 36.341 - Cable and wire facilities expenses-Account 6410 (Class B telephone companies); Accounts 6411...  

Code of Federal Regulations, 2010 CFR

...account includes the expenses for poles, antenna supporting structures, aerial cable, underground cable, buried cable, submarine cable, deep sea cable, intrabuilding network cable, aerial wire, and conduit systems. (b) The general method of...

2010-10-01

446

Force relaxation and sprinback of novel elastic orthopedic cables  

Microsoft Academic Search

Cerclage cables have proven to be very useful in the orthopedic field for bones stabilization and plate fixation but the initial enthusiasm for metallic cables has declined with their high complication rates. Metal materials provide limited elastic deformation compromising their ability to maintain compression. This study compares the mechanical properties of new elastic cables with cobalt-chrome and stainless-steel cables. Methods:

Fanny Canet; Yannick Baril; Vladimir Brailovski; Yvan Petit; Guillaume Bissonnette; G-Yves Laflamme

2011-01-01

447

Vision-based underwater cable detection and following using AUVs  

Microsoft Academic Search

In this paper, cable detection and tracking algorithm is presented. A detailed description on how to overcome the two practical problems encountered in optical vision based cable following systems in underwater environments is presented. The two main problems considered are; namely (1) navigation of AUV when cable is invisible in the image, and (2) selection of the correct cable (interested

Arjuna Balasuriya; T. Ura

2002-01-01

448

Reduced-Cable Smart motors Using DC Power Line Communication  

Microsoft Academic Search

A servomotor design that is powered and controlled through only one wire is presented. A traditional servomotor needs both a power cable and a control cable connecting the motor to a control amplifier. Cables are bulky, heavy, and expensive and, more importantly, difficult to install and maintain in many applications. Particularly for multi-axis applications, like robots and machine tools, cable

Chun-hung Liu; Eric Wade; Haruhiko Asada

2001-01-01

449

47 CFR 32.2424 - Submarine & deep sea cable.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 2012-10-01 false Submarine & deep sea cable. 32.2424...Balance Sheet Accounts § 32.2424 Submarine & deep sea cable. (a) This...shall include the original cost of submarine cable and deep sea cable...

2012-10-01

450

47 CFR 32.2424 - Submarine & deep sea cable.  

...2014-10-01 2014-10-01 false Submarine & deep sea cable. 32.2424...Balance Sheet Accounts § 32.2424 Submarine & deep sea cable. (a) This...shall include the original cost of submarine cable and deep sea cable...

2014-10-01

451

47 CFR 32.2424 - Submarine & deep sea cable.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 false Submarine & deep sea cable. 32.2424...Balance Sheet Accounts § 32.2424 Submarine & deep sea cable. (a) This...shall include the original cost of submarine cable and deep sea cable...

2013-10-01

452

Regulations; Office of Cable Television, State of New Jersey.  

ERIC Educational Resources Information Center

Regulations promulgated in accordance with the authority provided the Office of Cable Television, Board of Public Utility Commissioners, State of New Jersey, to regulate cable television in the public interest are set forth. These apply to cable television (CATV) companies which own, control, operate, or manage cable television systems and to…

New Jersey State Dept. of Public Utilities, Trenton. Office of Cable Television.

453

Development and testing of HTS cables and terminations at ORNL  

Microsoft Academic Search

The Oak Ridge National Laboratory (ORNL) and the Southwire Company have used the ORNL 5 m cable test facility to develop high-temperature superconducting (HTS) cables and terminations to support the first industrial demonstration of an HTS cable at the Southwire manufacturing complex. Two 5 m, cold dielectric cables have been tested for direct current (DC) voltage, alternating current (AC) losses,

M. J. Gouge; J. A. Demko; P. W. Fisher; C. A. Foster; J. W. Lue; J. P. Stovall; U. Sinha; J. Armstrong; R. L. Hughey; D. Lindsay; J. Tolbert

2001-01-01

454

Alaskan Submarine Cables: A Struggle with a Harsh Environment  

Microsoft Academic Search

The Alaskan cable system at one time included 86 submarine telegraph cables stretching from Puget Sound northward through the Alaskan Panhandle and thence westward into the Aleutian Island Arc. Cable failures in this system reveal dynamic natural forces affecting the sea floor. The cable failures can primarily be attributed in straits on the continental shelf and upper continental slope to

BRUCE C. HEEZENl; G. LEONARD JOHNSON

455

Fiber optic sensor system for stress monitoring in power cables  

Microsoft Academic Search

Monitoring of stress in power cables is of great interest to determine the cable lifetime, especially under rough environmental conditions like in offshore wind energy plants. Standard single mode fibers are generally included in power cables for data transfer. In our approach we developed a sensor device which uses single mode fibers already included in the cables and a short

J. Burgmeier; W. Schippers; W. Schade

2009-01-01

456

Operating experience of the Southwire high temperature superconducting cable installation  

Microsoft Academic Search

Southwire Company is operating the world's first high temperature superconducting (HTS) cable at its corporate headquarters in Carrollton, Georgia. The HTS system consists of three 30 m long single phase cables rated at 12.4 kV, 1250 A and is cooled by pressurized liquid nitrogen. The cable provides power to Southwire's two main manufacturing plants and the machinery division. The cable

D. T. Lindsay

2002-01-01

457

101. CABLE DISTRIBUTION UNITS, SOUTHEAST SIDE OF LANDLINE INSTRUMENTATION ROOM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

101. CABLE DISTRIBUTION UNITS, SOUTHEAST SIDE OF LANDLINE INSTRUMENTATION ROOM (106), LSB (BLDG. 770). NOTE CABLES ENTER CABLE DISTRIBUTION UNITS FROM OVERHEAD CABLE TRAYS. - Vandenberg Air Force Base, Space Launch Complex 3, Launch Pad 3 West, Napa & Alden Roads, Lompoc, Santa Barbara County, CA

458

Development of scaling rules for Rutherford type superconducting cables  

Microsoft Academic Search

Scaling rules that provide guidelines for choosing the parameters for a wide range of superconducting cables are given. These parameters include strand size, strand number, keystone angle, percentage of compaction, cable pitch, and compacted cable dimensions. In addition, the tolerance ranges for the key cable manufacturing parameters such as mandrel size and shape, strand tension, and Turkshead temperature control are

John M. Royet; R. M. Scanlan

1991-01-01

459

Characterization of fiber optic cables under large tensile loads  

SciTech Connect

Fiber optic cables designed for the Nevada Test Site (NTS) have to withstand an unusually harsh environment. Cables have been manufactured under a 6 year old DOE specification that has been slightly modified as the cable requirements are better understood. In order to better understand the cable properties a unique capability has been established at the NTS. Instrumentation has been developed to characterize the transmission properties of 1 km of fiber optic cable placed under a controlled tensile load up to 1500 lbs. The properties measured are cable tension, cable elongation, induced attenuation, attenuation vs. location, fiber strain, bandwidth, and ambient temperature. Preforming these measurements on cables from the two qualified NTS fiber optic cable manufacturers, Siecor and Andrew Corp., led to a new set of specifications. The relevant new and old specifications will be reported along with the characterization techniques and results on cables manufactured under the old specification.

Ogle, J.W.; Looney, L.D.

1984-01-01

460

Internal insulation system development  

NASA Technical Reports Server (NTRS)

The development of an internal insulation system for cryogenic liquids is described. The insulation system is based on a gas layer concept in which capillary or surface tension effects are used to maintain a stable gas layer within a cellular core structure between the tank wall and the contained cryogen. In this work, a 1.8 meter diameter tank was insulated and tested with liquid hydrogen. Ability to withstand cycling of the aluminum tank wall to 450 K was a design and test condition.

Gille, J. P.

1973-01-01

461

Insulation fact sheet  

SciTech Connect

Electricity bills, oil bills, gas bills - all homeowners pay for one or more of these utilities, and wish they paid less. Often many of us do not really know how to control or reduce our utility bills. We resign ourselves to high bills because we think that is the price we have to pay for a comfortable home. We encourage our children to turn off the lights and appliances, but may not recognize the benefits of insulating the attic. This publication provides facts relative to home insulation. It discusses where to insulate, what products to use, the decision making process, installation options, and sources of additional information.

NONE

1997-08-01

462

Microsphere Insulation Panels  

NASA Technical Reports Server (NTRS)

Microsphere insulation panels (MIPs) have been developed as lightweight, longlasting replacements for the foam and vacuum-jacketed systems heretofore used for thermally insulating cryogenic vessels and transfer ducts. The microsphere core material of a typical MIP consists of hollow glass bubbles, which have a combination of advantageous mechanical, chemical, and thermal-insulation properties heretofore available only separately in different materials. In particular, a core filling of glass microspheres has high crush strength and low density, is noncombustible, and performs well in soft vacuum.

Mohling, R.; Allen, M.; Baumgartner, R.

2006-01-01

463

Cryogenic insulation development  

NASA Technical Reports Server (NTRS)

Multilayer insulations for long term cryogenic storage are described. The development effort resulted in an insulation concept using lightweight radiation shields, separated by low conductive Dacron fiber tufts. The insulation is usually referred to as Superfloc. The fiber tufts are arranged in a triangular pattern and stand about .040 in. above the radiation shield base. Thermal and structural evaluation of Superfloc indicated that this material is a strong candidate for the development of high performance thermal protection systems because of its high strength, purge gas evacuation capability during boost, its density control and easy application to a tank.

Leonhard, K. E.

1972-01-01

464

Capacity upgrade in WDM submarine cable system  

Microsoft Academic Search

The capacity upgrade from 20 Gbit\\/s to 160 Gbit\\/s in a WDM submarine cable system has been designed based on the experimental study of the dependency of the repeater output power and the number of wavelength

Eiichi Shibano; Hidenori Taga; Toshio Kawazawa; Koji Goto

1999-01-01

465

Stranded superconducting cable of improved design  

NASA Technical Reports Server (NTRS)

High-current cable developed in liquid helium cooled magnets uses aluminum wire interspersed with the superconductor strands. The aluminum maintains higher electrical conductivity, is light in weight, and has low thermal capacity.

Brooks, J.; Laverick, C.; Lobell, G. M.; Purcell, J.

1970-01-01

466

Fast Pulses in a Coaxial Cable.  

ERIC Educational Resources Information Center

Describes an experiment designed to introduce physics majors to the triggered oscilloscope. The experiment uses an inexpensive, easily constructed generator which sends pulses down a long coaxial cable, thus providing useful waveforms. (DH)

Gray, Levi

1985-01-01

467

Improved ferrous shielding for flat cables  

NASA Technical Reports Server (NTRS)

To improve shielding of flat multicore cables, a thin, seamless ferrous shield around all cores optimizes low frequency magnetic shielding. Such shielding is covered with an ultrathin seamless coat of highly conductive nonferrous material.

Drechsler, R. J.

1969-01-01

468

Dynamic forces measurement of cables in structural health monitoring  

Microsoft Academic Search

Now a day, cable plays a more and more important role in civil engineering. As an effective construction member, cable is used in many long-span spatial structures. The cable tension measurement is required in the construction control, assessment and long-term monitoring of cable-supported structures. Mostly, the detection uses the Fourier Transform to get the frequencies of the cable, and then

Yu Song; Jianxin Wang

2010-01-01

469

Long-term monitoring FBG-based cable load sensor  

Microsoft Academic Search

Stay cables are the main load-bearing components of stayed-cable bridges. The cables stress status is an important factor to the stayed-cable bridge structure safety evaluation. So it's very important not only to the bridge construction, but also to the long-term safety evaluation for the bridge structure in-service. The accurate measurement for cable load depends on an effective sensor, especially to

Zhichun Zhang; Zhi Zhou; Chuan Wang; Jinping Ou

2006-01-01

470

A 2.5 Gb\\/s adaptive cable equalizer  

Microsoft Academic Search

High-rate data communication over cable suffers from intersymbol interference (ISI) introduced by the cable. This ISI can be greatly reduced if the receiver includes a cable equalizer. Usually, the equalizer is adaptive to track changes in the cable length. The prior high-speed cable equalizers are either implemented in GaAs and are fixed, or operate to a maximum of a few

M. H. Shakiba

1999-01-01

471

Design and construction of a high temperature superconducting power cable cryostat for use in railway system applications  

NASA Astrophysics Data System (ADS)

The primary objective of the current effort was to design and test a cryostat using a prototype five-meter long high temperature Bi2Sr2Ca2Cu3Oy (Bi-2223) superconducting dc power cable for railway systems. To satisfy the safety regulations of the Govt of Japan a mill sheet covered by super-insulation was used inside the walls of the cryostat. The thicknesses of various walls in the cryostat were obtained from a numerical analysis. A non-destructive inspection was utilized to find leaks under vacuum or pressure. The cryostat target temperature range was around 50 K, which is well below liquid nitrogen temperature, the operating temperature of the superconducting cable. The qualification testing was carried out from 77 down to 66 K. When using only the inner sheet wire, the maximum current at 77.3 K was 10 kA. The critical current (Ic) value increased with decreasing temperature and reached 11.79 kA at 73.7 K. This is the largest dc current reported in a Bi2Sr2Ca2Cu3Oy or YBa2Cu3Oy (Y-123) superconducting prototype cable so far. These results verify that the developed DC superconducting cable is reliable and fulfils all the requirements necessary for successful use in various power applications including railway systems. The key issues for the design of a reliable cryogenic system for superconducting power cables for railway systems are discussed.

Tomita, M.; Muralidhar, M.; Suzuki, K.; Fukumoto, Y.; Ishihara, A.; Akasaka, T.; Kobayashi, Y.

2013-10-01

472

THE MECHANICS OF HIGHLY-EXTENSIBLE CABLES  

Microsoft Academic Search

The mechanics of highly extensible cables are studied numerically. The governing equations for the cable motion are reformulated using Euler parameters and we employ a nonlinear stress–strain relation. Also, bending–stiffness terms are included to ensure a well-posed problem when tension becomes very low. Thus, the singularity associated with Euler–angle formulation is removed and the model allows for shock formation, while

A. A. Tjavaras; Q. Zhu; Y. Liu; M. S. Triantafyllou; D. K. P. Yue

1998-01-01

473

Earth Currents in Short Submarine Cables  

Microsoft Academic Search

PRIOR to 1940, faults on submarine telephone cables between Great Britain and the Continent were normally located by direct-current methods employing a good wire in another cable. Confirmatory tests were usually made by the impedance-frequency method1. When the time came in 1944 to restore telephone communications, no good wires were available. The impedance-frequency method was employed for fault localization with

D. W. Cherry; A. T. Stovold

1946-01-01

474

Numerical simulation of undersea cable dynamics  

Microsoft Academic Search

A fully three-dimensional code has been written to compute the motion of a towed cable. The code is based on a robust and stable finite difference approximation to the differential equations derived from basic dynamics. A 3500-ft cable pulled at 18.5 knots (hr⁻¹) through a circular turn of 700 yd radius has been computed in about half of the real

C. M. Ablow; S. Schechter

1983-01-01

475

A deep sea cable television system  

Microsoft Academic Search

The Naval Research Laboratory has developed a cable television system for use with the deep ocean search equipment used to locate the lost submarines THRESHER, SCORPION, ALVIN, and EURYDICE. The video equipment differs from most previous long-cable (6000 m.) systems used in the deep ocean in that the television signals are heterodyned into the 0.5-4.25 MHz band in order to

R. Patterson; F. Heemstra

1975-01-01

476

Outdoor HV composite polymeric insulators  

Microsoft Academic Search

HV composite polymeric insulators are being accepted increasingly for use in outdoor installations by the traditionally cautious electric power utilities worldwide. They currently represent ~60 to 70% of newly installed HV insulators in North America. The tremendous growth in the applications of non-ceramic composite insulators is due to their advantages over the traditional ceramic and glass insulators. These include light

R. Hackam

1999-01-01

477

Dynamic forces measurement of cables in structural health monitoring  

NASA Astrophysics Data System (ADS)

Now a day, cable plays a more and more important role in civil engineering. As an effective construction member, cable is used in many long-span spatial structures. The cable tension measurement is required in the construction control, assessment and long-term monitoring of cable-supported structures. Mostly, the detection uses the Fourier Transform to get the frequencies of the cable, and then applies the vibration-based cable tension theory to evaluate the cable tension. As a conventional method for cable tension measurement, the Fourier Transform can only be used in the static cable tension force test, but not dynamic cable tension test. The cable dynamic tension describes the load-deformation behavior of cables subjected to dynamic loading. It represents the intrinsic dynamic properties of cables. In order to get the dynamic cable force, time-frequency analysis must be done. In this paper, wavelet transform tool is used to analyze the signal, and obtain the cable tension dynamic change along with the time.

Song, Yu; Wang, Jianxin

2010-03-01

478

Coaxial Cables for Martian Extreme Temperature Environments  

NASA Technical Reports Server (NTRS)

Work was conducted to validate the use of the rover external flexible coaxial cabling for space under the extreme environments to be encountered during the Mars Science Laboratory (MSL) mission. The antennas must survive all ground operations plus the nominal 670-Martian-day mission that includes summer and winter seasons of the Mars environment. Successful development of processes established coaxial cable hardware fatigue limits, which were well beyond the expected in-flight exposures. In keeping with traditional qualification philosophy, this was accomplished by subjecting flight-representative coaxial cables to temperature cycling of the same depth as expected in-flight, but for three times the expected number of in-flight thermal cycles. Insertion loss and return loss tests were performed on the coaxial cables during the thermal chamber breaks. A vector network analyzer was calibrated and operated over the operational frequency range 7.145 to 8.450 GHz. Even though some of the exposed cables function only at UHF frequencies (approximately 400 MHz), the testing was more sensitive, and extending the test range down to 400 MHz would have cost frequency resolution. The Gore flexible coaxial cables, which were the subject of these tests, proved to be robust and displayed no sign of degradation due to the 3X exposure to the punishing Mars surface operations cycles.

Ramesham, Rajeshuni; Harvey, Wayne L.; Valas, Sam; Tsai, Michael C.

2011-01-01

479

Noise performance of magneto-inductive cables  

NASA Astrophysics Data System (ADS)

Magneto-inductive (MI) waveguides are metamaterial structures based on periodic arrangements of inductively coupled resonant magnetic elements. They are of interest for power transfer, communications and sensing, and can be realised in a flexible cable format. Signal-to-noise ratio is extremely important in applications involving signals. Here, we present the first experimental measurements of the noise performance of metamaterial cables. We focus on an application involving radiofrequency signal transmission in internal magnetic resonance imaging (MRI), where the subdivision of the metamaterial cable provides intrinsic patient safety. We consider MI cables suitable for use at 300 MHz during 1H MRI at 7 T, and find noise figures of 2.3-2.8 dB/m, together with losses of 3.0-3.9 dB/m, in good agreement with model calculations. These values are high compared to conventional cables, but become acceptable when (as here) the environment precludes the use of continuous conductors. To understand this behaviour, we present arguments for the fundamental performance limitations of these cables.

Wiltshire, M. C. K.; Syms, R. R. A.

2014-07-01

480

Calculations using the helical filamentary structure for current distributions of a six around one superconducting strand cable and a multifilamentary composite  

NASA Astrophysics Data System (ADS)

The current and magnetic-field distributions within a twisted six around one (6-1) superconducting strand cable and a twisted simple superconducting multifilamentary composite have been studied with the assumption that the current distribution within each strand or each filament is uniform. For this purpose, the vector potential and the magnetic field due to a helical conductor with a circular cross section is calculated from the numerical integration of the analytical expression for a helical thin conductor. The current distributions among each strand or each filament are obtained by minimizing the magnetic energy for the case of the insulated strands or filaments, and by requiring zero magnetic flux enclosed between any pair of strands or filaments for the case of the noninsulated strands or filaments. For the case of the untwisted insulated strands or filaments, it is confirmed that the calculated results coincide with those due to the inductance. The screening circulation currents among strands within a multistrand cable or filaments within a composite are obtained as the difference between the current distributions for the case with the noninsulated strand or filament and for the case with the imaginarily insulated strand or filament. As a result, it is revealed that the negative current in the inner strands or filaments is a universal feature of the current distributions for superconducting multistrand cables and multifilamentary composites during the current sweep. Finally, the magnetic field distributions of a twisted 6-1 superconducting strand cable and a twisted simple superconducting multifilamentary composite have been obtained.

Tominaka, Toshiharu

2004-11-01

481

Cooper Pairs in Insulators?!  

ScienceCinema

Nearly 50 years elapsed between the discovery of superconductivity and the emergence of the microscopic theory describing this zero resistance state. The explanation required a novel phase of matter in which conduction electrons joined in weakly bound pairs and condensed with other pairs into a single quantum state. Surprisingly, this Cooper pair formation has also been invoked to account for recently uncovered high-resistance or insulating phases of matter. To address this possibility, we have used nanotechnology to create an insulating system that we can probe directly for Cooper pairs. I will present the evidence that Cooper pairs exist and dominate the electrical transport in these insulators and I will discuss how these findings provide new insight into superconductor to insulator quantum phase transitions. 

James Valles

2010-01-08

482

Composite flexible blanket insulation  

NASA Technical Reports Server (NTRS)

An improved composite flexible blanket insulation is presented comprising top silicon carbide having an interlock design, wherein the reflective shield is composed of single or double aluminized polyimide and wherein the polyimide film has a honeycomb pattern.

Kourtides, Demetrius A. (inventor); Lowe, David M. (inventor)

1994-01-01

483

Insulator for laser housing  

DOEpatents

The present invention provides a heat-resistant electrical insulator adapted for joining laser housing portions, which insulator comprises: an annulus; a channel in the annulus traversing the circumference and length of the housing; at least two ports, each communicating with the channel and an outer surface of the housing; and an attachment for securely attaching each end of the annulus to a laser housing member.

Duncan, David B. (Auburn, CA)

1992-01-01

484

Insulator for laser housing  

DOEpatents

The present invention provides a heat-resistant electrical insulator adapted for joining laser housing portions, which insulator comprises: an annulus; a channel in the annulus traversing the circumference and length of the housing; at least two ports, each communicating with the channel and an outer surface of the housing; and an attachment for securely attaching each end of the annulus to a laser housing member. 3 figs.

Duncan, D.B.

1992-12-29

485

Photonic Floquet topological insulators.  

PubMed

Topological insulators are a new phase of matter, with the striking property that conduction of electrons occurs only on their surfaces. In two dimensions, electrons on the surface of a topological insulator are not scattered despite defects and disorder, providing robustness akin to that of superconductors. Topological insulators are predicted to have wide-ranging applications in fault-tolerant quantum computing and spintronics. Substantial effort has been directed towards realizing topological insulators for electromagnetic waves. One-dimensional systems with topological edge states have been demonstrated, but these states are zero-dimensional and therefore exhibit no transport properties. Topological protection of microwaves has been observed using a mechanism similar to the quantum Hall effect, by placing a gyromagnetic photonic crystal in an external magnetic field. But because magnetic effects are very weak at optical frequencies, realizing photonic topological insulators with scatter-free edge states requires a fundamentally different mechanism-one that is free of magnetic fields. A number of proposals for photonic topological transport have been put forward recently. One suggested temporal modulation of a photonic crystal, thus breaking time-reversal symmetry and inducing one-way edge states. This is in the spirit of the proposed Floquet topological insulators, in which temporal variations in solid-state systems induce topological edge states. Here we propose and experimentally demonstrate a photonic topological insulator free of external fields and with scatter-free edge transport-a photonic lattice exhibiting topologically protected transport of visible light on the lattice edges. Our system is composed of an array of evanescently coupled helical waveguides arranged in a graphene-like honeycomb lattice. Paraxial diffraction of light is described by a Schrödinger equation where the propagation coordinate (z) acts as 'time'. Thus the helicity of the waveguides breaks z-reversal symmetry as proposed for Floquet topological insulators. This structure results in one-way edge states that are topologically protected from scattering. PMID:23579677

Rechtsman, Mikael C; Zeuner, Julia M; Plotnik, Yonatan; Lumer, Yaakov; Podolsky, Daniel; Dreisow, Felix; Nolte, Stefan; Segev, Mordechai; Szameit, Alexander

2013-04-11

486

Zero halogen, fire retardant fiber optic shipboard cable  

NASA Astrophysics Data System (ADS)

A fiber optic cable has been developed which meets a proposed shipboard cable specification. The proposed specification, PMS-400-XYZ-1, outlines the cable constructions to be two, four, and eight fiber designs. The specification also calls for a low halogen, low smoke, solvent resistant fiber optic cable that passes the IEEE-383 flame propagation test and NES 711 smoke emission standards. For traditional copper cable these performance criteria are usually achieved by crosslinking cable jacket materials. This process has been tried for fiber optic cables with limited success due to the microbend sensitivity of the fibers. A cable, using a new thermoplastic material has been designed, manufactured, and tested. The cable design also meets other requirements of the specification. These include dry water-blocking, fluid immersions, storage temperature cycling and operating temperature cycling that surpasses the specified range.

Chamberlain, John C.; Zimmerman, Bernd D.

1986-11-01

487

Event Notification Management Information Base for Data over Cable Service Interface Specifications (DOCSIS)Compliant Cable Modems and Cable Modem Termination Systems  

Microsoft Academic Search

This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. In particular, it defines a basic set of managed objects for Simple Network Management Protocol (SNMP) based event notification management of Data Over Cable Service Interface Specification (DOCSIS) compliant Cable Modems and Cable Modem Termination Systems. This MIB is

A. Ahmad; G. Nakanishi

2006-01-01

488

New Opportunities for Cabled Ocean Observatories  

NASA Astrophysics Data System (ADS)

With the decommissioning of transoceanic telecommunications cables as they become obsolete or uneconomical, there is an opportunity to use these systems for ocean observatories. Two coaxial cables, TPC-1 and HAW-2 are currently in use for observatories, and another, ANZCAN, is scheduled to be used beginning in 2004 to provide a cabled observatory at Station ALOHA, north of Oahu. The ALOHA observatory will provide several Mb/s data rates and about 1 kW of power to experiments installed at Station ALOHA. Sensors can be installed either by wet mateable connection to a junction box on the ocean floor using an ROV, or by acoustic data link to the system. In either case real-time data will be provided to users over the Internet. A Small Experiment Module, to be first installed at the Hawaii-2 Observatory, and later at Station ALOHA, will provide relatively cheap and uncomplicated access to the observatories for relatively simple sensors. Within the next few years, the first electro-optical cables installed in the 1980's will be decommissioned and could be available for scientific use. These cables could provide long "extension cords" (thousands of km) with very high bandwidth and reasonable power to several observatories in remote locations in the ocean. While they could be used in-place, a more exciting scenario is to use cable ships to pick up sections of cable and move them to locations of higher scientific interest. While such moves would not be cheap, the costs would rival the cost of installation and maintenance of a buoyed observatory, with far more bandwidth and power available for science use.

Duennebier, F. K.; Butler, R.; Karl, D. M.; Roger, L. B.

2002-12-01

489

Assessment of the non-destructive nature of PASD on wire insulation integrity.  

SciTech Connect

The potential of a new cable diagnostic known as Pulse-Arrested Spark Discharge technique (PASD) is being studied. Previous reports have documented the capability of the technique to locate cable failures using a short high voltage pulse. This report will investigate the impact of PASD on the sample under test. In this report, two different energy deposition experiments are discussed. These experiments include the PASD pulse ({approx}6 mJ) and a high energy discharge ({approx}600 mJ) produced from a charged capacitor source. The high energy experiment is used to inflict detectable damage upon the insulators and to make comparisons with the effects of the low energy PASD pulse. Insulator breakdown voltage strength before and after application of the PASD pulse and high energy discharges are compared. Results indicate that the PASD technique does not appear to degrade the breakdown strength of the insulator or to produce visible damage. However, testing of the additional materials, including connector insulators, may be warranted to verify PASDs non-destructive nature across the full spectrum of insulators used in commercial aircraft wiring systems.

Lockner, Thomas Ramsbeck; Peña, Gary Edward; Schneider, Larry X.; Higgins, Matthew B.; Glover, Steven Frank

2003-09-01

490

Detonator cable initiation system safety investigation: Consequences of energizing the detonator and actuator cables  

SciTech Connect

This study was performed to explore and assess the worst-case response of a W89-type weapons system, damaged so as to expose detonator and/or detonator safing strong link (DSSL) cables to the most extreme, credible lightning-discharge, environment. The test program used extremely high-current-level, fast-rise-time (1- to 2-{mu}s) discharges to simulate lightning strikes to either the exposed detonator or DSSL cables. Discharges with peak currents above 700 kA were required to explode test sections of detonator cable and launch a flyer fast enough potentially to detonate weapon high explosive (HE). Detonator-safing-strong-link (DSSL) cables were exploded in direct contact with hot LX-17 and Ultrafine TATB (UFTATB). At maximum charging voltage, the discharge system associated with the HE firing chamber exploded the cables at more than 600-kA peak current; however, neither LX-17 nor UFTATB detonated at 250{degree}C. Tests showed that intense surface arc discharges of more than 700 kA/cm in width across the surface of hot UFTATB [generally the more sensitive of the two insensitive high explosives (IHE)] could not initiate this hot IHE. As an extension to this study, we applied the same technique to test sections of the much-narrower but thicker-cover-layer W87 detonator cable. These tests were performed at the same initial stored electrical energy as that used for the W89 study. Because of the narrower cable conductor in the W87 cables, discharges greater than 550-kA peak current were sufficient to explode the cable and launch a fast flyer. In summary, we found that lightning strikes to exposed DSSL cables cannot directly detonate LX-17 or UFTATB even at high temperatures, and they pose no HE safety threat.

Osher, J.; Chau, H.; Von Holle, W.

1994-03-01

491

Non-destructive qualification tests for ITER cryogenic axial insulating breaks  

SciTech Connect

In the ITER superconducting magnets the dielectric separation between the CICC (Cable-In-Conduit Conductors) and the helium supply pipes is made through the so-called insulating breaks (IB). These devices shall provide the required dielectric insulation at a 30 kV level under different types of stresses and constraints: thermal, mechanical, dielectric and ionizing radiations. As part of the R and D program, the ITER Organization launched contracts with industrial companies aimed at the qualification of the manufacturing techniques. After reviewing the main functional aspects, this paper describes and discusses the protocol established for non-destructive qualification tests of the prototypes.

Kosek, Jacek [Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland and CERN, Geneva 23,CH-1211 (Switzerland); Lopez, Roberto; Tommasini, Davide [CERN, Geneva 23,CH-1211 (Switzerland); Rodriguez-Mateos, Felix [CERN, Geneva 23,CH-1211, Switzerland and ITER Organization, Route de Vinon sur Verdon, 13115 Saint Paul lez Durance (France)

2014-01-29

492

Coaxial cable distribution plant performance simulation  

NASA Astrophysics Data System (ADS)

The CATV system delivers analog video signals from a centralized headend through a tree- and-branch fiber/coax network. That architecture is very cost effective for delivering broadcast video channels to a vast area. The introduction of interactive TV, data and telephony services requires an upstream link from customers to the headend. Although equipment for upstream transmission is available, CATV systems are primarily engineered for the delivery of one way analog broadcast TV programs. In this paper, issues related to two-way digital transmission through the coaxial cable distribution plant are examined. The objective is to establish a reliable computer modeling environment for the study and simulation of general and advanced transmission systems over the coaxial cable distribution plant. The discussions are focused on three general topics: the coaxial cable distribution plant transmission channel, the corresponding noise environment, and applicable transmission system architectures. Two- port network models are developed for the components (coaxial cable, taps, etc.) of the coaxial cable distribution plant. A realistic distribution plant channel model can be constructed based on these component models. The distribution plant noise level is analyzed based on thermal noise level, amplifier noise figure, and the funneling effect. The upstream ingress noise model is also developed. Three advanced transmission systems, adaptive transmitter, frame based equalization, and discrete multitone (DMT), are presented. End to end computer simulation results are presented using QPSK upstream.

Carangi, Mark D.; Chen, Walter Y.; Kerpez, Kenneth J.; Valenti, Craig F.

1995-11-01

493

Recent progress of HTS cable project  

NASA Astrophysics Data System (ADS)

A lot of developments of HTS wires and their applications have been conducted since the discovery of HTS materials in the world. It has been recently reported that critical current of BSCCO wires improved to more than 200 A at 77 K and a large amount of wire was provided with high quality as industrial products. This improvement can be expected to accelerate the commercialization of HTS applications such as an HTS cable, HTS motor and so on. As the proofs of such trends, Sumitomo Electric constructed two HTS cable systems and started their operations in the USA and Korea last year. One of them is the HTS cable in Albany, NY, which has a capacity of 34.5 kV and 800 A and 350 m in length. It has been operated in a real grid without any trouble for 9 months. The other is the HTS cable in Korea, which has a capacity of 22.9 kV and 1250 A and 100 m in length. Its operation also started in the KEPCO testing yard last year. These results demonstrate reliance and stability of its operation. Recently, a new national project of an HTS cable has just started in Japan to demonstrate the operation in a real grid and study the system operations including a monitoring method, an alarm system, a maintenance method, etc. This paper reports the results of Albany and Korea projects and an outline of the new project.

Masuda, T.; Yumura, H.; Watanabe, M.

2008-09-01

494

Design and construction of a radiation resistant quadrupole using metal oxide insulated CICC  

SciTech Connect

The construction of a engineering test model of a radiation resistant quadrupole is described. The cold-iron quadrupole uses coils fabricated from metal-oixide (synthetic spinel) insulated Cable-In-Conduit-Conductor (CICC). The superconductor is NbTi in a copper matrix. The quadrupole is designed to produce a pole-tip field of 2 T with an operating current of 7,000 A.

Albert F. Zeller

2012-12-28

495

Commercialization of Medium Voltage HTS Triax TM Cable Systems  

SciTech Connect

The original project scope that was established in 2007 aimed to install a 1,700 meter (1.1 mile) medium voltage HTS Triax{TM} cable system into the utility grid in New Orleans, LA. In 2010, however, the utility partner withdrew from the project, so the 1,700 meter cable installation was cancelled and the scope of work was reduced. The work then concentrated on the specific barriers to commercialization of HTS cable technology. The modified scope included long-length HTS cable design and testing, high voltage factory test development, optimized cooling system development, and HTS cable life-cycle analysis. In 2012, Southwire again analyzed the market for HTS cables and deemed the near term market acceptance to be low. The scope of work was further reduced to the completion of tasks already started and to testing of the existing HTS cable system in Columbus, OH. The work completed under the project included: • Long-length cable modeling and analysis • HTS wire evaluation and testing • Cable testing for AC losses • Optimized cooling system design • Life cycle testing of the HTS cable in Columbus, OH • Project management. The 200 meter long HTS Triax{TM} cable in Columbus, OH was incorporated into the project under the initial scope changes as a test bed for life cycle testing as well as the site for an optimized HTS cable cooling system. The Columbus cable utilizes the HTS TriaxTM design, so it provided an economical tool for these of the project tasks.

Knoll, David

2012-12-31

496

Dose rate effects in radiation degradation of polymer-based cable materials  

NASA Astrophysics Data System (ADS)

Cable ageing under the nuclear power plant (NPP) conditions must be effectively managed to ensure that the required plant safety and reliability are maintained throughout the plant service life. Ionizing radiation is one of the main stressors causing age-related degradation of polymer-based cable materials in air. For a given absorbed dose, radiation-induced damage to a polymer in air environment usually depends on the dose rate of the exposure. In this work, the effect of dose rate on the degradation rate has been studied. Three types of NPP cables (with jacket/insulation combinations PVC/PVC, PVC/PE, XPE/XPE) were irradiated at room temperature using 60Co gamma ray source at average dose rates of 7, 30 and 100 Gy/h with the doses up to 590 kGy. The irradiated samples have been tested for their mechanical properties, thermo-oxidative stability (using differential scanning calorimetry, DSC), and density. In the case of PVC and PE samples, the tested properties have shown evident dose rate effects, while the XPE material has shown no noticeable ones. The values of elongation at break and the thermo-oxidative stability decrease with the advanced degradation, density tends to increase with the absorbed dose. For XPE samples this effect can be partially explained by the increase of crystallinity. It was tested by the DSC determination of the crystalline phase amount.

Pla?ek, V.; Bartoní?ek, B.; Hnát, V.; Otáhal, B.

2003-08-01

497

47 CFR 76.950 - Complaints regarding cable programming service rates.  

Code of Federal Regulations, 2010 CFR

... false Complaints regarding cable programming service rates. 76.950 Section...76.950 Complaints regarding cable programming service rates. (a) A franchising...its cable operator's rate for cable programming service, or the reasonableness...

2010-10-01

498

47 CFR 1.1155 - Schedule of regulatory fees and filing locations for cable television services.  

Code of Federal Regulations, 2011 CFR

...regulatory fees and filing locations for cable television services. 1.1155 Section 1.1155...regulatory fees and filing locations for cable television services. Fee amount Address 1. Cable Television Relay Service2. Cable TV System...

2011-10-01

499

30 CFR 75.601 - Short circuit protection of trailing cables.  

Code of Federal Regulations, 2012 CFR

...2012-07-01 2012-07-01 false Short circuit protection of trailing cables. 75...Trailing Cables § 75.601 Short circuit protection of trailing cables. [Statutory Provisions] Short circuit protection for trailing cables...

2012-07-01

500

30 CFR 75.601 - Short circuit protection of trailing cables.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 2010-07-01 false Short circuit protection of trailing cables. 75...Trailing Cables § 75.601 Short circuit protection of trailing cables. [Statutory Provisions] Short circuit protection for trailing cables...

2010-07-01