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1

Measurements on the frozen strain in XLPE insulated cables using thermo mechanical analysis  

Microsoft Academic Search

This study is presented on the frozen strain in XLPE measured by means of a thermomechanical analysis (TMAI. The magnitude of the strain in XLPE insulated cables ranges from 2 to 8 % and the cable insulation is stressed in tensibn for the axial and azimuthal directions and compression for the radial direction. Thermomechanical properties of XLPE are also measured,

HIROSHI SUZUKI; MAMORU KANAOKA; YASUO SEKII

1988-01-01

2

Morphological improvement of the insulation for EHV XLPE cables by an additive  

Microsoft Academic Search

In order to reduce the insulation thickness of EHV XLPE (cross-linked polyethylene) cables, a method for improving the interfacial region between the insulation and the semiconducting layer through mixing an additive into the semiconducting layer has been developed. For the purpose of improving XLPE morphology near the interface, an additive mixed into the semiconducting layer is diffused into the insulation

M. Ishida; T. Okamoto; K. Izumi

1990-01-01

3

Rehabilitation of water tree aged XLPE cable insulation  

Microsoft Academic Search

The main purpose of this paper is to present results from rehabilitation experiments performed on laboratory aged Rogowski type test objects and samples of a 24 kV service aged XLPE cable. The results obtained show that impregnation with the rehabilitation liquids acetophenone and CableCure-silicone increased the AC breakdown strength of water tree aged test objects to a value higher than

Hallvard Faremo; E. Ildstad

1994-01-01

4

Improvement of AC Breakdown Strength of EHV XLPE Cables by Diffusing an Additive into the Insulation.  

National Technical Information Service (NTIS)

As one of reducing measures on the construction cost of EHV XLPE cable lines, a reduction of the insulation thickness is expected. An interfacial phenomenon between the insulation and the semiconduting layer is watched as a starting point of the insulatio...

M. Ishida N. Hozumi T. Okamoto

1988-01-01

5

Comparative laboratory evaluation of TR-XLPE and XLPE cables with Super-smooth conductor shields  

Microsoft Academic Search

This paper provides data on four commercial tree retardant crosslinked polyethylene (TR-XLPE) and one cross-linked polyethylene (XLPE) insulated 15 kV cables supplied by three manufacturers. The cables have \\

C. Katz; M. Walker; B. Fryszczyn

2004-01-01

6

Improvement of breakdown strength by additives and curing conditions on XLPE insulation for power cable  

Microsoft Academic Search

In This work, dielectric strength of XLPE insulation with lamellar densities varied by means of additives and curing conditions was investigated. To increase lamellar density of XLPE insulating material, two kinds of additives were used and cooling rates were controlled as curing conditions. TEM and X-ray diffraction was used to investigate the degree of lamellar density varied by additives. For

Bok-Hee Youn; Dae-Hee Cho; Sung-Ik Shim

2004-01-01

7

Insulation characterization in multistress conditions by accelerated life tests: An application to XLPE and EPR for high voltage cables  

Microsoft Academic Search

This paper focuses on accelerated testing procedures that can be applied to XLPE and EPR for high voltage cables and that are aimed to achieve the thermo-electrical endurance characterization of insulation. Several methods and techniques for single and combined thermo-electrical stress are illustrated; indices for the evaluation of electrical, thermal, and multi-stress endurance are reported and their derivation is shown.

G. Mazzanti; G. C. Montanari; L. Simoni

1997-01-01

8

CV cable no hando denso kaimen kinbo zetsuentai no tenkazai ni yoru kaishitsu. (Improvement of the insulation near the interface to semiconducting layer on EHV XLPE cables by an additive).  

National Technical Information Service (NTIS)

To reduce by half the insulation thickness of EHV XLPE cables, it has been developed a method for improving the electrical insulation breakdown strength through mixing an additive into the semiconducting layer. In order to study morphological effects of t...

M. Ishida T. Okamoto N. Hozumi

1989-01-01

9

Severe degradation of the conductor screen of service and laboratory aged medium voltage XLPE insulated cables  

Microsoft Academic Search

The main purpose of this paper is to show the strong correlation between corrosion of the metallic aluminum conductor and the formation of interconnected cracks \\/ voids in the conductor screen, creating initiation sites for vented water trees in service aged medium voltage XLPE cables. The results show that porous structures in the conductor screen previously reported for laboratory aged

Sverre Hvidsten; Stine Kvande; Arve Ryen; Per Bjørn Larsen

2009-01-01

10

Correlation between FTIR spectra and birefringence measurements in XLPE cable insulation  

Microsoft Academic Search

The authors report infrared (IR) absorption measurements conducted on laboratory-aged and unaged cross-linked polyethylene (XLPE) cable samples. Variations in the IR absorbance of the methyl group (1377 cm -1) and the carbonyl groups (~1700 cm-1) were recorded as a function of both radial and angular coordinates for the samples. These variations were found to be strongly correlated with optical birefringence

E. David; J.-M. Fourmigue; J.-L. Parpal; J.-P. Crine

1992-01-01

11

Investigation of dielectric behavior of thermally aged XLPE cable in the high-frequency range  

Microsoft Academic Search

The widespread use of crosslinked polyethylene (XLPE) in the wire and cable industry may be attributed mainly to its outstanding physical and chemical properties. However, it has been recognized that degradation of XLPE insulation during service, such as thermo-oxidation and water treeing, may lead to premature electrical breakdown of the XLPE insulation cables. Diagnostic measurements would considerably assist to distinguish

Chonung Kim; Zhijian Jin; Pingkai Jiang; Zishu Zhu; Genlin Wang

2006-01-01

12

Semiconducting layer as an attractive PD detection sensor of XLPE cables  

Microsoft Academic Search

Online monitoring of high voltage (HV) cross linked polyethylene (XLPE) cables is a major requirement and interest of utilities for reliable operation of underground cables. Although XLPE cables have a relatively reliable insulation system, however since its insulating material is less resistant to partial discharges (PD), the failure risk increases significantly after occurrence of any partial discharge. Therefore sensitive sensors

Mehdi Vakilian; Trevor R. Blackburn; R. E. James; B. Toan Phung

2006-01-01

13

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

Microsoft Academic Search

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

N. Hozumi; T. Okamoto; M. Ishida

1988-01-01

14

Electrical breakdown strength of 5 kV imperfect XLPE cable after combined AC-DC excitation  

Microsoft Academic Search

Electrical breakdown strength of 5 kV imperfect XLPE cable under different combined AC-DC excitation is studied. Two types of imperfect cable samples were used in this research: cable samples with artificial holes inside the insulation and cable samples with embedded metal needles. A comparison of the breakdown voltage under pulsating excitation for imperfect and sound cable shows that the pulsating

S. Grzybowski; J. Fan

1996-01-01

15

Investigation of Mechanism of Breakdown in XLPE Cables. Final Report.  

National Technical Information Service (NTIS)

The basic hypothesis that microporosity plays a significant role in the mechanism of breakdown of XLPE cable is explored. The potential improvement achieved by impregnating the microporous regions of the cable core with a neutral liquid is evaluated, with...

A. L. McKean

1976-01-01

16

Direct observation of time-dependent space charge profiles in XLPE cable under high electric fields  

Microsoft Academic Search

Space charge distribution was measured, applying an electric field of >1 MV\\/cm to 3 mm thick XLPE cable insulation. Improving the conventional pulse electro-acoustic method, a new method was developed to measure space charge when applying HV to cables. Under high field, hetero charges were formed soon after voltage application, followed by an injection from the cathode. Then intermittent injections

N. Hozumi; H. Suzuki; T. Okamoto; K. Watanabe; A. Watanabe

1994-01-01

17

Breakdown strength affected by the interface roughness at the semiconducting layer in XLPE power cables  

Microsoft Academic Search

The authors describe the relationship between the breakdown strength and the roughness of the semiconducting interface in model XLPE (cross-linked polyethylene) power cables with insulation of 3.5 mm thickness. Nine kinds of specimen cables were manufactured out of seven kinds of semiconducting layer materials. Six kinds of additives were used to modify the semiconducting materials. The maximum breakdown strength of

T. Okamoto; N. Hozumi; M. Ishida

1991-01-01

18

CV cable handodenso no kairyo ni yoru impulse hakai tokusei no kojo. (Improvement of impulse breakdown strength of an XLPE cable by modifing semiconducting layer).  

National Technical Information Service (NTIS)

The writers have carried out investigations on the technique which reduces the insulation thickness by improving breakdown strength of XLPE cables, using additives to improve interfaces of semiconducting layers, in order to restrain construction cost. Min...

N. Hozumi T. Okamoto M. Ishida

1988-01-01

19

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

SciTech Connect

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 responsible for a large number of premature failures of URD cables. The type of cable construction, cleanliness of the raw materials, extrusion practices, and nature of the operating environment were shown to influence the rate of degradation. Experience gained through analysis of field aged cables, combined with laboratory tests, has resulted in significant and ongoing technology transfer to the electric utilities, cable materials suppliers, and cable manufacturers. 11 refs.

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

1989-01-01

20

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

21

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

22

Successful testing of 345-kV XLPE cables and premolded joints at IREQ  

SciTech Connect

Extruded polymeric cables and accessories are an alternative to self-contained fluid filled (SCFF) cables for Extra-High-Voltage (EHV) systems. Crosslinked polyethylene (XLPE) insulated cables have many advantages over the traditional fluid-filled pressurized cable system with the elimination of the hydraulic system and the associated equipment and complications during the installation and operation/maintenance of such systems. Other advantages of the extruded cable system arise from the new accessory technologies and the use of splices and terminations that are prefabricated and pretested in the factory and require less time to install on site. Concerns over the long term reliability of high voltage cable systems, in particular the accessories and the lack of service experience above 300 kV led to the decision of Hydro-Quebec to carry out a prequalification (long-term) test program to assess the reliability of the cable materials and to verify the cable and accessory installation methods to be employed. The cables were installed in duct banks and manholes simulating actual installation conditions used in Hydro-Quebec underground cable network. This paper describes the program and results of the prequalification tests of 345-kV XLPE cables and accessories performed at Hydro-Quebec`s Research Institute (IREQ) in partnership with three international cable manufacturers, Alcatel, Fujikura and Pirelli.

Parpal, J.L.; Awad, R.; Choquette, M.; Becker, J.; Hiivala, L.; Chatterjee, S.; Kojima, T.; Rosevear, R.D.; Morelli, O.

1997-04-01

23

AC STRENGTH TEST DATA OF UNAGED AND WATER TANK AGED XLPE COMPOUNDS FOR TRANSMISSION AND DISTRIBUTION POWER CABLES  

Microsoft Academic Search

AC dielectric strength tests are performed on both virgin and water filled tank aged cable model specimens insulated with four commercial XLPE compounds in order to investigate the behaviour of such material under harsh wet environments. The results are compared in terms of Weibull scale and shape parameters. The degree of deterioration of aged compounds - measured in terms of

Massimo MARZINOTTO; Carlo MAZZETTI; Massimo POMPILI Prospero SCHIAFFINO

2007-01-01

24

CV cable no han dodenso kaimen arasa ga zetsuen hakai kyodo ni ataeru eikyo. (Influence of the interface roughness between the insulation layer and the semiconducting layer on the breakdown strength in XLPE power cables).  

National Technical Information Service (NTIS)

The resaerch aiming the compacted ultra-high voltage CV cable is promoted to respone to the requirement to construct the underground transmission and distribution system. One of some countermeqsures is to reduce the insulation thickness to a half and the ...

1989-01-01

25

Development of a method of partial discharge detection in extra-high voltage cross-linked polyethylene insulated cable lines  

Microsoft Academic Search

This paper reports that deterioration in the insulation performance of extra-high voltage XLPE cables is believed to be attributable to the deterioration caused by partial discharges. In the authors study, after using an XLPE cable to investigate the behavior of partial discharges under various adverse conditions, we succeeded in developing a highly sensitive new method of measuring partial discharge in

G. Katsuta; A. Toya; K. Muraoka; T. Endoh; Y. Sekii; C. Ikeda

1992-01-01

26

The measurement of very low conductivity and dielectric loss in XLPE cables: a possible method to detect degradation due to thermal aging  

Microsoft Academic Search

The dielectric response of crosslinked polyethylene (XLPE) insulated, miniature power cables, extruded with inner and outer semicons, was measured over the frequency range 10 -4 to 10 4 Hz at temperatures from 20 to 100 ?C. A dielectric spectrometer was used for the frequency range 10 -4 to 10 -2 Hz. A bespoke noise-free power supply was constructed and used

J. C. Fothergill; S. J. Dodd; L. A. Dissado; T. Liu; U. H. Nilsson

2011-01-01

27

Correlation between tan ? diagnostic measurements and breakdown performance at VLF for MV XLPE cables  

Microsoft Academic Search

The main contribution of this paper is to investigate the correlation between tan delta diagnostic measurements at 0.1 Hz (Very Low Frequency-VLF) and VLF breakdown performance for medium voltage (MV) cable samples through a laboratory test program. The cable samples used are a set of 15 kV, Cross-linked Polyethylene (XLPE), unjacketed cables removed from the field, the same service area,

J. C. Hernández-Mejía; J. Perkel; R. Harley; N. Hampton; R. Hartlein

2009-01-01

28

An investigation of the potential of polypropylene and its blends for use in recyclable high voltage cable insulation systems  

Microsoft Academic Search

Most modern extruded high voltage cables employ cross-linked polyethylene (XLPE) as the insulation material. XLPE has excellent\\u000a thermo-mechanical properties, is relatively cheap and has a low dielectric loss, which make it an ideal material for this\\u000a application. Unfortunately, XLPE is not easily recycled at the end of its lifetime leading to questions concerning its long-term\\u000a sustainability. A previous investigation in

I. L. Hosier; A. S. Vaughan; S. G. Swingler

2011-01-01

29

Pattern recognition of partial discharge in XLPE cables using a neural network  

Microsoft Academic Search

An experimental study of pattern recognition of partial discharge (PD) in a crosslinked polyethylene (XLPE) cable by using a neural network (NN) system is described. The NN system was a three-layer artificial neural network system with feedforward connections, and its learning method was a backpropagation algorithm incorporating an external teacher signal. Input information for the NN was a combination of

H. Suzuki; T. Endoh

1992-01-01

30

Double layered sheath in accurate HV XLPE cable modeling  

Microsoft Academic Search

This paper discusses modelling of high voltage AC underground cables. For long cables, when crossbonding points are present, not only the coaxial mode of propagation is excited during transient phenomena, but also the intersheath mode. This causes inaccurate simulation results for high frequency studies of crossbonded cables. For the intersheath mode, the correct physical representation of the cables sheath as

J. De Silva; C. L. Bak; W. Wiechowski

2010-01-01

31

Electrical breakdown strength of XLPE cables under combined AC-DC voltage  

Microsoft Academic Search

This paper presents data on electrical breakdown strength of 5 kV XLPE cable under AC voltages, DC voltages, and superimposed AC upon DC voltages. In the latter case, the ratio of the AC to DC voltage components (p=Vac\\/Vdc) was varied between the limits of 0.04

S. Grzybowski; R. L. McMellon

1995-01-01

32

Life estimation of water tree deteriorated XLPE cables by VLF (very low frequency) voltage withstand test  

Microsoft Academic Search

The authors investigated a new life estimation method for service-aged, water tree deteriorated 22-77 kV XLPE cables by voltage withstand test. At first, they selected more suitable waveform for testing voltage from damped oscillating wave (OSW) and very low frequency wave (VLF) voltage as the instead of AC and DC. It was found that VLF voltage has high ability to

Katsumi Uchida; Masahiko Nakade; Daisuke Inoue; Hiroyuki Sakakibara; Masashi Yagi

2002-01-01

33

Retrofit XLPE cable systems for the EHV range  

Microsoft Academic Search

The dielectric fluid in the high pressure fluid filled (HPFF) cable system pipe is not environmentally friendly and is leaking into the surrounding soil, due to pipe corrosion. Therefore power utilities are forced to exchange the oil to an environmentally friendly one or to develop a retrofit cable system, eliminating the oil completely. On this basis, ConEd\\/New York initiated a

J. Karlstrand

2000-01-01

34

Direct Introduction of Semicon Layers in XLPE Cable Model  

Microsoft Academic Search

Detection and location of any partial discharge signal requires an accurate frequency dependent cable model to correctly simulate the P.D. signal attenuation during its propagation in the cable. This model should be capable of simulating the semiconducting layers which have significant effects on P.D. signal attenuation and its propagation velocity. There is a substantial need for improvements in the flexibility

M. Hasheminezhad; M. Vakiliant; T. R. Blackburn; B. T. Phung

2006-01-01

35

Withstand voltage testing in combination with PD measurements of XLPE cables under damped alternating voltage on-site  

Microsoft Academic Search

As an after-laying test, withstand voltages and PD measurements of XLPE cables on-site have been finished respectively for many years. Standard test procedures using continuous AC voltages are very cost intensive due to the high capacitive power demand of the cables and the resulting large sizes of the test sets. The contribution paper presents that withstand voltage testing in combination

Sun Zhenquan; Zhao Xuefeng; Li Jisheng; Li Yanming

2009-01-01

36

Study of space charge in polyethylene for cable insulation by direct probing  

Microsoft Academic Search

By utilizing the laser-induced-pressure-pulse (LIPP) technique, the authors quantitatively studied the behavior of space charge in polyethylene (PE) for cable insulation to clarify the space charge effects in power cables. Effects of crosslinking, carbon-loaded semiconducting layer and additives (antioxidant) are reported. Crosslinked polyethylene (XLPE) with metal electrodes showed negative homo charge near the cathode, suggesting that crosslinking enhances electron injection

Y. Suzuoki; H. Matsukawa; S.-O. Han; T. Mizutani; M. Ieda; N. Yoshifuji

1991-01-01

37

Development of Y-branch Joint for 275kV XLPE and Fluid Filled Cable  

NASA Astrophysics Data System (ADS)

When a new UHV substation is built in an urban region, generally, an existing underground transmission line shall be diverted and drawn into the new substation. Compared with above mentioned construction method, enormous cost reduction of switching facilities and cable construction is expected with applying a Y-Branch Joint (YJ) which is able to be a 3-way joint. The YJ has already been applied for 154kV class circuit, however, it has not been investigated for 275kV class circuit. Since both XLPE and Fluid-Filled cable are presently used in 275kV class underground cable line, an universal design YJ for both cables have been investigated. The YJ was applied a compact design which was based on our sophisticated electrical stress control technology for 500kV prefabricated type joint. Furthermore, the design was based on its prefabricated assembling technology. The YJ was verified its electrical and mechanical performance as 275kV cable joint by completion of its assembling test and a long term electrical test.

Goto, Takeshi; Yamashita, Makoto; Sakamaki, Masatoshi

38

Electrical breakdown strength of 5 kV XLPE cable with imperfections under combined AC-DC voltage  

Microsoft Academic Search

This paper presents data on electrical breakdown strength of 5 kV XLPE cable with imperfection under AC voltage, DC voltage and superimposed AC upon DC voltage (pulsate voltage). In the later case, the measurement was taken over a wide range of pulsate ratio, which is defined as p=Vac\\/Vdc. Comparison with the former measurement results for sound cables shows that the

S. Grzybowski; J. Fan

1996-01-01

39

Polymer nanocomposites as insulation for HV DC cables - Investigations on the thermal breakdown  

Microsoft Academic Search

With the advent of nano-particle fillers in insulating materials, the insulating materials of superior quality have come to fore. In the recent past, nanocomposite LDPE\\/XLPE (low density polyethylene\\/cross linked polyethelene) power cable dielectrics have been synthesized. A preliminary evaluation of these new class of materials seem to show that, addition of small amounts of sub-micron inorganic fillers improved the dielectric

C. Chakradhar Reddy; T. S. Ramu

2008-01-01

40

Water treeing and breakdown strength reduction of XLPE insulation  

Microsoft Academic Search

An effort was made to determine factors influencing initiation and growth of vented water trees and to study the reduction of breakdown strength caused by water treeing. Water treeing experiments were performed on both cable samples and Rogowski-type test objects. The influence of aging time and electric field stress was elucidated. In order to test the hypothesis that water treeing

E. Ildstad; J. Sletbak; H. Faremo

1989-01-01

41

Cryogenic cable insulated with oil impregnated paper  

Microsoft Academic Search

The breakdown properties of oil impregnated paper insulation are very significant at low temperature, especially around the freezing temperature of oil. We proposed a new insulating method for cryogenic cable insulated with the oil impregnated paper. The conductor of the cable we designed has a coolant channel inside and its electrical insulation is located between two thermal insulators to be

Z. Iwata; N. Ichiyanagi; E. Kawai

1977-01-01

42

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

43

Determination of threshold and maximum operating electric stresses for selected high voltage insulations: Investigation of aged polymeric dielectric cable. Final report.  

National Technical Information Service (NTIS)

Based on the successful completion of the extensive research project DOE/ET/29303-1 February 1982 to develop a new method for the determination of threshold voltage in XLPE and EPR insulated cables, tests were initiated to establish the maximum safe opera...

G. S. Eager G. W. Seman B. Fryszczyn

1995-01-01

44

The Failure Rate Of Polyethylene Insulated Cable  

Microsoft Academic Search

The failure rate of polyethylene cable in utility underground distribution systems is a matter of concern throughout the industry. A major failure mechanism is electrochemical treeing which results in insulation breakdown. Electrochemical treeing in po3yethylene cable is known to be a function of voltage stress, moisture, insulation d efects and time in service. This paper deals with the formulation of

W. F. Horton; A. N. St.-John

1979-01-01

45

Development of the new polymer insulating materials for HVDC cable  

Microsoft Academic Search

The properties of modified HDPE, selected from various polymer materials by evaluations of DC characteristics, were examined in both sheet and cable samples. It was found that the modification, which introduced a small amount of polar group into HDPE, considerably enhanced DC breakdown strength to as high as 1.5-2.0 times those of XLPE (cross-linked polyethylene). Under a poling voltage of

N. Yoshifuji; T. Niwa; T. Takahashi; H. Miyata

2002-01-01

46

Water treeing - filled versus unfilled cable insulation  

Microsoft Academic Search

Attempts to make XLPE increasingly resistant to water tree growth have involved additives, which decrease hydrophobicity and make the XLPE more like EPR. EPS are evolving through improved processing, clay compatibilization, etc. to reduce losses while retaining the inherent water tree resistance. Thus in the end, the two technologies appear to be moving toward the \\

Steven Boggs; James Xu

2001-01-01

47

Requirements for different components in cables for offshore application  

Microsoft Academic Search

The installation of offshore wind-farms and the increase in electricity trading between countries has resulted in an increased number of offshore submarine cable installations as an efficient way to solve many electricity supply issues. Although offshore cables with XLPE insulation are similar to land based cables, the offshore environment adds to the challenges of very long lengths, much more onerous

D. Wald; H. Orton; R. Svoma

2009-01-01

48

Calculation of electric field distribution at high voltage cable terminations  

Microsoft Academic Search

Crosslinked polyethylene (XLPE) insulated power cables are used for transmission and distribution of electrical power. Such cables are subjected to extensive high voltage testing for performance evaluation and quality control purposes. During such testing, the cable ends have to be prepared carefully to make a proper end termination. Usually deionized water terminations are used for this purpose. Alternatively conductive paint

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

2010-01-01

49

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

50

Improved cable insulation for superconducting magnets  

Microsoft Academic Search

The Kapton CI cable insulation system described in this paper has been shown through extensive testing to be robust and reliable. It does require higher molding temperatures but these can readily be accommodated through proper design of the coil tooling. Its characteristics are equal to or superior in all known respects to those of the Kapton\\/Fiberglass system that has been

M. Anerella; A. K. Ghosh; E. Kelly; J. Schmalzle; E. Willen; J. Fraivillig; J. Ochsner; D. J. Parish

1993-01-01

51

Electric fields in HVDC paper-insulated cables  

Microsoft Academic Search

HVDC cables start playing a more and more important role in interconnecting national grids. This paper deals with the calculation of electric fields in HVDC cables. The calculation of fields in an HVDC cable is far more complex than the equivalent case in HV ac cables. This is due to the fact that the conductivity of the cable insulation is

M. J. P. Jeroense; P. H. F. Morshuis

2002-01-01

52

Impregnation of solid dielectric cable insulation  

NASA Astrophysics Data System (ADS)

Laboratory scale investigations, conducted to assess the feasibility of improving the dielectric characteristics of crosslinked polyethylene insulated cables rated 138 kV and above, are discussed. Impregnation of slabs cut from 138 kV cables and of model cables with liquids increased the ac breakdown strength, presumably by filling the microvoids (and possibly in some cases acting as a boltage stabilizer) and preventing premature failure due to electrical discharge. The degree of improvement depends on the chemical nature of the impregnant. Vinyl toluene, styrene, styrene oxide, and vinyl pyrrolidone were found to increase the dielectric strength substantially and in some cases improve the VT curve. Optical and scanning electron microscopic examination supports the concept of void filling. An economic analysis including raw materials' costs and manufacturing costs suggests that the process of impregnation and polymerization costs somewhat less than lead sheathed, dry cured power cables.

Kiss, K. D.; Mangaraj, D.; Doepken, H. C., Jr.; Biskeborn, M. C.; Malawer, E.; McKean, A. L.; Tsuji, K.

1980-07-01

53

Improved cable insulation for superconducting magnets  

SciTech Connect

Several years ago, Brookhaven joined with DuPont in a cooperative effort to develop improved cable insulation for SSC superconducting dipole magnets. The effort was supported by the SSC Central Design Group and later the SSC Laboratory. It was undertaken because turn-to-turn and midplane shorts were routinely being experienced during the assembly of magnets with coils made of the existing Kapton/Fiberglass (K/FG) system of Kapton film overwrapped with epoxy-impregnated fiberglass tape. Dissection of failed magnets showed that insulation disruption and punch-through was occurring near the inner edges of turns close to the magnet midplane. Coil pressures of greater than 17 kpsi were sufficient to disrupt the insulation at local high spots where wires in neighboring turns crossed one another and where the cable had been strongly compacted in the keystoning operation during cable manufacture. In the joint development program, numerous combinations of polyimide films manufactured by DuPont with varying configurations and properties (including thickness) were subjected to tests at Brookhaven. Early tests were bench trials using wrapped cable samples. The most promising candidates were used in coils and many of these assembled and tested as magnets in both the SSC and RHIC magnet programs currently underway. The Kapton CI (CI) system that has been adopted represents a suitable compromise of numerous competing factors. It exhibits improved performance in the critical parameter of compressive punch-through resistance as well as other advantages over the K/FG system.

Anerella, M.; Ghosh, A.K.; Kelly, E.; Schmalzle, J.; Willen, E. [Brookhaven National Lab., Upton, NY (United States); Fraivillig, J.; Ochsner, J.; Parish, D.J. [Du Pont de Nemours (E.I.) and Co., Wilmington, DE (United States)

1993-09-01

54

Determination of Threshold and Maximum Operating Electric Stresses for Selected High-Voltage Insulations. Progress Report No. 1, September 1, 1980-May 30, 1981.  

National Technical Information Service (NTIS)

Based on the successful completion of an extensive research project to develop a new method for the determination of threshold voltages in XLPE and EPR insulated cables, tests were initiated to establish the maximum safe operating electric stresses of cro...

M. Sosnowski C. Katz

1981-01-01

55

An Accelerated Life Test for Evaluating Power Cable Insulation  

Microsoft Academic Search

For many years, the power cable industry has sought an accelerated test that would quantitatively evaluate the life of polyethylene insulation for high voltage cables. This paper describes preliminary results leading to development of such a test. This test employs full size cables with accelerating factors such as temperature, water, electrical stress, frequency and mechanical stress. Times-to-failure for thernnplastic and

R. Lyle; J. W. Kirkland

1981-01-01

56

Space charge evolution in XLPE and EPR under high uniform electric fields  

Microsoft Academic Search

Evolution of a space charge with time of electric field application is investigated in cross-linked polyethylene (XLPE) and ethylene propylene rubber (EPR) subjected to uniform AC and DC fields of ~60 kV\\/mm. To simulate the insulation of polymeric high voltage cables the specimens were equipped with semicon electrodes. In order to minimize the effect of the amount of space charge

M. Abou-Dakka; A. Bulinski; S. Bamji

1998-01-01

57

Round-robin test on CIGRE water tree resistance evaluation methods for extruded cable insulation  

SciTech Connect

A round robin test program was initiated by the CIGRE TF 15-06-05 in 1986 to evaluate three methods, donoted as A, B and C, proposed by the Task Force to test the water-treeing propensity of extruded cable insulation. This report covers the second round, conducted at the University of Connecticut under EPRI sponsorship, to evaluate Method A and Method B. Method A is designed to test materials subjected to non-uniform electric fields, such as those arising at the tips of protrusions. Method B is designed to test materials exposed to uniform or quasi-uniform fields. The electrically stressed material samples are immersed in a salt solution and aged for prescribed periods of time at either room temperature (Method A) or at 70{degrees}C (Method B). They are, then, sliced, dyed in a methylene blue solution and examined under an optical microscope to determine the nature and extent of treeing. This report covers the testing of as standard crosslinked polyethylene (XLPE) and two different brands of tree-retarding XLPE obtained from European and US sources. Variations of the domestic samples were produced by extracting their ionic impurities with deionized water. The objective of the evaluation was to determine whether the CIGRE test methods could consistently distinguish between the various samples for their water-treeing propensity. The report describes, in detail, the test cells, the testing methods and the results obtained. It also describes the modifications made to the cell used in Method A to improve the consistency of its results. 4 refs., 29 figs., 7 tabs.

Mashikian, M.S.; Wen, Y. (Connecticut Univ., Storrs, CT (United States). Inst. of Materials Science)

1991-09-01

58

Life assessment of large power cables in fossil fuel generating stations  

SciTech Connect

As part of fossil generating station upgrades, the major components of the electrical station service system (i.e., the large power cables for the generator leads, transformer secondaries, and motor feeders) are evaluated for increased capacity, continued reliability, and additional service life. This paper discusses the cable aging mechanisms for fossil-power stations, including thermal aging of insulation, insulation voltage stress, corrosion of lead in lead-sheathed cables, long-term water absorption by insulation, and water treeing of insulation. Also presented are approaches to analyzing these aging mechanisms to assess the life of the cable. Cable design and installations that merit particular attention during a life assessment study include feeders using multiple conductors per phase, unjacketed lead-sheathed cable, unshielded 5 kV power cable installed in conduit, cables using butyl and SBR insulation systems, cable bus systems, and cross-linked-polyethylene (XLPE)-insulated cables in underground installations.

Petty, K.A. (Stone and Webster Engineering Corp., Boston, MA (USA))

1989-01-01

59

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

Microsoft Academic Search

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

Mihir Roy

2005-01-01

60

Tester automatically checks insulation of individual conductors in multiple-strand cables  

NASA Technical Reports Server (NTRS)

Insulation tester checks multiple-strand electrical cables in nuclear rocket reactors. It has both manual and automatic capabilities and can check the insulation of a cable with 200 or more conductors in a few minutes.

Shaw, J.; Vuckovich, M.

1967-01-01

61

Measurement technique for high frequency characterization of semiconducting materials in extruded cables  

Microsoft Academic Search

Knowledge on the dependence of wave propagation characteristics on material properties and cable design is important in establishing diagnostic methods for cable insulation. In this study, a high frequency measurement technique to characterize the semi-conducting screens in medium voltage cross-linked polyethylene (XLPE) cables has been developed. The frequency ranges from 30 kHz to 500 MHz. The influence of the experimental

Gavita Mugala; Roland Eriksson; Uno Gafvert; Per Pettersson

2004-01-01

62

Effect of DC testing water tree deteriorated cable and a preliminary evaluation of VLF, as alternate  

Microsoft Academic Search

According to the experience of some power utilities, the application of industry recommended high voltage DC field tests on 5-35 kV extruded dielectric cables, containing water trees, sometimes causes further deterioration of the insulation. Tests conducted on laboratory aged 15 kV ethylene propylene rubber (EP) and 15 and 28 kV crosslinked polyethylene (XLPE) insulated cables indicate that DC proof tests

B. Fryszczyn; C. Katz; H. ElBadaly; A. R. Jean

1991-01-01

63

High voltage insulation for power cables utilizing high temperature superconductivity  

Microsoft Academic Search

It is worth noting that, with a few exceptions, the efforts to develop dielectric systems, especially for the LTD superconducting cables, are lagging behind the intense efforts to develop more efficient HT superconducting materials, tapes, and conductors. The results presented here and reported in the literature confirm that lifetime is usually greater for cryogenic insulation, and thus the impulse and

Alexander Bulinski; John Densley

1999-01-01

64

Irradiation effects on magnetic probes made of mineral insulated cable  

Microsoft Academic Search

A magnetic probe made of mineral insulated (MI) cable in Japan Material Testing Reactor (JMTR) was irradiated as one of the irradiation tests on diagnostics components for experimental thermonuclear reactors such as International Thermonuclear Experimental Reactor (ITER). Magnetic probes have to be installed inside the vacuum vessel to measure the magnetic field, which is very important for the position control

T Nishitani; T Shikama; M Fukao; H Matsuo; R Snider; J Broesch; N Sagawa; H Kawamura; S Kasai

2000-01-01

65

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

66

Effect of D. C. testing water tree deteriorated cable and a preliminary evaluation of V. L. F. as alternate  

Microsoft Academic Search

This paper reports that according to the experience of some power utilities, the application of industry recommended high voltage d.c. field tests on 5-35 kV extruded dielectric cables, containing water trees, sometimes causes further deterioration of the insulation. Tests conducted on laboratory aged 15 kV ethylene propylene rubber (EP) and 15 and 28 kV crosslinked polyethylene (XLPE) insulated cables indicate

G. S. Jr. Eager; B. Fryszczyn; C. Katz; H. A. ElBadaly; A. R. Jean

1992-01-01

67

Insulation studies and experimental results for high Tc superconducting power cable  

Microsoft Academic Search

In this paper, we studied electric insulation characteristics of synthetic Laminated Polypropylene Paper (LPP) in liquid nitrogen (LN2) for the application to high temperature superconducting (HTS) cable. And, we selected the insulation paper\\/LN2 composite insulation type for the electric insulation design of a HTS cable. Furthermore, we compared the breakdown characteristics of the butt gap and bent mini-model cable that

H. J. Kim; D. S. Kwag; J. W. Cho; K. C. Seong; K. D. Sim; S. H. Kim

2005-01-01

68

Thermal degradation of cable and wire insulations  

SciTech Connect

Corrosive products produced during thermal degradation of insulating materials in air and nitrogen were measured. The effects of heating rate on modes of degradation as well as a heat-release-rate calorimeter were surveyed. Results indicate that both neoprene and PVC samples form considerable amounts of HCl even at low heating rates and low irradiance levels. However, if CaCO/sub 3/ or MgCO/sub 3/ is included in polymer formulations, generated HCl will react with these fillers and does not escape from the material. Experiments confirmed that decomposition modes are influenced by antioxidants, plasticizers, stabilizers and flame retardants used in plastic formulations. Exposure radiant flux levels also control decomposition kinetics. Irradiance levels as low as 2.5 W/cm/sup 2/ produce predominantly low concentrations of cyclic and polycyclic hydrocarbons. At 5.0 W/cm/sup 2/, a great variety of compounds ranging from acids and simple saturated hydrocarbons to complex polycyclic compounds are formed. When neoprene and PVC are subjected to a flux of 8.0 W/cm/sup 2/, the degradation products consist mainly of HCl, unsaturated hydrocarbons and polycyclic hydrocarbons. Thermal measurements showed that common insulating materials are not easily ignited and that they burn with relatively little heat output and slow flame spread.

Alvares, N.J.; Lipska-Quinn, A.E.; Hasegawa, H.K.

1982-11-10

69

Riser-cable development for ocean-thermal-energy conversion plants. Progress report  

SciTech Connect

Developmental testing and analysis of OTEC riser cables and component materials has been undertaken. Two full-size riser cables have been manufactured and tested, one using cross-linked polyethylene (XLPE) insulation, the other using self-contained, oil filled (SCOF) insulation. These cables and their components have been subjected to testing which simulates handling and insulation prior to OTEC service, as well as the electrical and mechanical loads predicted in service. Results of testing and analyses to date indicate that the XLPE cable has significant potential in the OTEC riser application. The cable has performed well in mechanical and electrical testing. The results for the SCOF cable are mixed. The SCOF cable collapses due to pressure at depths typical of OTEC service; slippage may occur within the insulation or between the conductor and insulation which could result in early cable failure. Particular attention must be paid to alleviating these problems in future cable design efforts. Implications of these findings for cable and system development are presented for use by OTEC platform designers. These findings are subject to change as additional test data are obtained.

Not Available

1982-12-01

70

Effect of D. C. testing water tree deteriorated cable and a preliminary evaluation of V. L. F. as alternate  

SciTech Connect

This paper reports that according to the experience of some power utilities, the application of industry recommended high voltage d.c. field tests on 5-35 kV extruded dielectric cables, containing water trees, sometimes causes further deterioration of the insulation. Tests conducted on laboratory aged 15 kV ethylene propylene rubber (EP) and 15 and 28 kV crosslinked polyethylene (XLPE) insulated cables indicate that d.c. proof tests in accordance with AEIC specifications an IEEE test guides without flashover do not appear to cause further deterioration. Depending on the degree of cable aging and the level of test voltage, when flashovers take place, damage may be inflicted to XLPE cables. No damage was observed on aged EP cable, at the same test levels. Because of the aforementioned power utility experience, some users have requested an alternate field proof test. Tests conducted on new XLPE and EP cables indicate that damage to the insulation structure can be detected using VLF (0.1 Hz) voltage at approximately one-third the d.c. voltage level. Field tests conducted on severely tree deteriorated 15 kV polyethylene (PE) cable using AEIC recommended d.c. voltage level of about five times operating voltage level caused cable failure; VLF voltage levels up to two times operating voltage did not. VLF voltage appears to be a suitable alternate to d.c. voltage for field proof testing.

Eager, G.S. Jr.; Fryszczyn, B.; Katz, C. (Cable Technology Lab., Inc., New Brunswick, NJ (US)); ElBadaly, H.A.; Jean, A.R. (Consolidated Edison of New York, Inc., New York, NY (US))

1992-07-01

71

Heat transport in insulation of cables cooled by superfluid helium  

NASA Astrophysics Data System (ADS)

The research and development programme for the Large Hadron Collider (LHC) magnets developed at CERN includes stability studies which are carried out at Saclay in a collaboration between CERN and CEN Saclay. For Nb-Ti magnets cooled by superfluid helium the most severe thermal barrier comes from the electrical insulation of the cable. The thermal behaviour of He II inside the kapton layers cannot be predicted theoretically. However, its participation in the removal of the heat is necessary for ensuring the stability of the conductor with respect to the expected continuous beam losses. Experiments are carried out to measure the difference in temperature between the insulated conductors and a bath of superfluid helium, when the conductors are heated, and to determine the He II paths through the insulation. The measured thermal resistance includes the resistance of the kapton tape which is wrapped around the cable and the resistance of the cooling channels which are formed by the fibreglass ribbon around the kapton. The total measured resistance is much lower than the solid conduction resistance, in spite of weak heat transport in the cooling channels. Results suggest that there might be small leaks in the kapton covering which are very favourable to heat transfer via the superfluid helium.

Meuris, C.

72

Effect of ethylene content on bowtie trees and wet electrical performance in filled EPR insulation materials  

Microsoft Academic Search

The insulation for extruded medium voltage power cables currently used world-wide are based on two broad categories of polymeric materials: crosslinkable elastomers, consisting of Ethylene Propylene Rubber (EPR)*, and crosslinkable low density polyethylene, consisting of Crosslinked Polyethylene (XLPE) or Tree Retardant Crosslinked Polyethylene (TRXLPE). These two broad categories have over 40 years of proven field performance. A considerable amount of

Amalendu Sarkar; Mark Easter; Ed Walcott; William Temple; J. T. Smith

2010-01-01

73

A study on thickness effect of HTS cable for insulation design  

NASA Astrophysics Data System (ADS)

The electrical insulating design is important to realize the HTS (high temperature superconducting) cable because this cable is operated under the high voltage environment. For the insulation design of HTS cable, it is necessary to investigate the PD (partial discharge) inception, ac and impulse breakdown strength of LN2 (liquid nitrogen)/LPP (laminated polypropylene) composite insulation system. However, the designed insulation thickness by ac and impulse could not be applied to cable fabrication process due to much low electrical breakdown strength. The effect of the multi-layered insulation paper was not considered on the previous insulation design and the insulation thickness by PD inception strength could be applied only. In this paper, the electrical breakdown characteristic, which considered the effect of multi-layered of LPP, was investigated to design the insulation thickness.

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

2006-06-01

74

Insulating and semiconductive jackets for medium and high voltage underground power cable applications  

Microsoft Academic Search

Insulating jackets extend cable life by retarding the ingress of water and soluble ions from the ground, minimizing cable installation damage and mitigating neutral corrosion. The physical properties of jacketing materials are discussed, along with the evolution of polyethylene jacketing compounds and the requirements of compatible red cable identification compounds.<>

GORDON GRAHAM; STEVE SZANISZLO

1995-01-01

75

Bow-tie-tree in EPR cables after accelerated water treeing test  

SciTech Connect

The paper describes the results of accelerated water treeing test after a period of approximately one year with two recently manufactured (1988) varieties of commercial EPR cables, produced by different manufacturers and possessing different cable structures, as well as water impervious XLPE cable for comparison. In the test, bow-tie trees were found in the EPR insulation which was though to develop no or few bow-tie-trees. Examination results of bow-tie-tree in EPR cables are described in this report.

Uematsu, T.; Iwata, Z.; Irie, S.; Fujii, O. (Furukawa Electric Co. Ltd., Tokyo (Japan))

1992-10-01

76

Investigation of cable insulation and thermo-mechanical properties of epoxy impregnated Nb3Sn composite  

Microsoft Academic Search

Within the framework of the Fermilab high field magnet program, cable insulation and thermo-mechanical properties of epoxy impregnated Nb3Sn composite were studied. As a part of cable insulation development, a new wrappable ceramic insulation was investigated to understand its mechanical properties and its influence on magnet fabrication technology. Measurements of modulus of elasticity and Poisson's ratio of Nb3Sn composite made

D. R. Chichili; T. T. Arkan; J. P. Ozelis; I. Terechkine

2000-01-01

77

Safety Research of Insulating Materials of Cable for Nuclear Power Generating Station.  

National Technical Information Service (NTIS)

Polymers such as crosslinked PE, EPR, PVC, neoprene, CSP, CLPE and EP are used as insulating and jacketing materials of cable for nuclear power generating station. For the flame retardancy and environment test of cable, it is necessary to observe the test...

C. K. Lee J. H. Choi Y. K. Kong H. S. Chang

1982-01-01

78

Electromagnetic Techniques for Fault and Partial Discharge Location in Gas-Insulated Cables and Substations  

Microsoft Academic Search

The fully enclosed nature of gas-insulated substations substantially increases the difficulty of testing, maintaining, and troubleshooting the switchgear. Under EPRI sponsorship, Ontario Hydro has developed systems for fault location in gas cables and partial discharge location for cables and substations.

S. A. Boggs

1982-01-01

79

Study of the natural ageing of PVC insulation for electrical cables  

Microsoft Academic Search

The characterisation of high voltage cable insulation waste is addressed in an effort to determine their further utilisation either as feed in reprocessing or for the recovery of the energy and material content by pyrolysis. Electrically aged (18 years outdoors at 6–10 kV) polyvinyl chloride (PVC) cables were ground by mechanical or cryogenic procedures. The waste was studied in comparison

Mihai Brebu; Cornelia Vasile; Smaranda Rovana Antonie; Mihaela Chiriac; Margareta Precup; Jin Yang; Christian Roy

2000-01-01

80

Heat transfer through cable insulation of Nb-Ti superconducting magnets operating in He II  

NASA Astrophysics Data System (ADS)

The operation of Nb-Ti superconducting magnets in He II relies on superfluidity to overcome the severe thermal barrier represented by the cable electrical insulation. In wrapped cable insulations, like those used for the main magnets of the Large Hadron Collider (LHC) particle accelerator, the micro-channels network created by the insulation wrappings allows to efficiently transfer the heat deposited or generated in the cable to the He bath. In this paper, available experimental data of heat transfer through polyimide electrical insulation schemes are analyzed. A steady-state thermal model is developed to describe the insulation of the LHC main dipole magnets and the Enhanced Insulation proposed for the High Luminosity LHC upgrade (HL-LHC), according to the relevant geometric parameters. The model is based on the coupled mechanisms of heat transfer through the bulk of the dielectric insulation and through micro-channels between the insulation tapes. A good agreement is found between calculations and tests performed at different applied pressures and heating configurations. The model allows identifying the heat fluxes in the cable cross-section as well as the dimensions of the micro-channels. These dimensions are confirmed by microscope images of the two insulations schemes.

Granieri, P. P.

2013-01-01

81

Surge strength of symmetric cable with monolithic polyethylene insulation of quads  

NASA Astrophysics Data System (ADS)

The lightning resistance of MKP sub m AS h sub p-4x4x1.05 + 2x0.7 symmetric railroad communication cables operating along the Baykal-Amur line was evaluated in terms of the dielectric strength of their insulation system, in failure-free operation. The insulation system in these cables consists of monolithic polyethylene around each quad core and polyethylene sleeving around each aluminum sheath. Experimental data for this evaluation had been obtained by measurement of the voltage between conductor bundle and sheath, this voltage being the highest during a lightning stroke, not only along cable segments between repeater points but also in splices and in potheads. A comparison with similar data in MKSA sub p SH sub p 4x4x1.2 cables indicates that the tested MKP sub m AS h sub p cables have a much higher surge strength.

Miroshnichenko, V. K.

1985-01-01

82

Vacuum-Insulated Flexible Cryostats for Long Hts Cables: Requirements, Status and Prospects  

NASA Astrophysics Data System (ADS)

Several high temperature superconducting (HTS) cable demonstration projects have begun operation on the electric grid in the last few years with the liquid nitrogen-cooled, three-phase cable contained in one or more vacuum-insulated, flexible cryostats with lengths up to ~600 meters. These grid demonstration projects are realistic prototypes of the anticipated commercial market which will require superconducting cable lengths in the multiple kilometer range with the vacuum-jacketed cryostats in underground ducts providing acceptable thermal insulation for up to decades. The current state-of-the art for flexible cryostats (installation constraints, heat loads with a good and degraded vacuum, impact of cable bends, getter performance and lifetime, weld and accessory reliability) is discussed. Further development needed to meet the challenging commercial HTS cable application is outlined.

Gouge, M. J.; Demko, J. A.; Roden, M. L.; Maguire, J. F.; Weber, C. S.

2008-03-01

83

Vacuum-Insulated, Flexible Cryostats for Long HTS Cables: Requirements, Status, and Prospects.  

SciTech Connect

Several high temperature superconducting (HTS) cable demonstration projects have begun operation on the electric grid in the last few years with the liquid nitrogen-cooled cable contained in one or more vacuum-insulated, flexible cryostats with lengths up to 600 meters. These grid demonstration projects are prototypes of the anticipated commercial market which will require superconducting cable lengths in the multiple kilometer range with the vacuum-jacketed cryostats in underground ducts providing acceptable thermal insulation for decades. The current state-of-the art for flexible cryostats (installation constraints, heat loads with a good and degraded vacuum, impact of cable bends, getter lifetime and reliability) is discussed. Further development needed to meet the challenging commercial HTS cable application is outlined.

Gouge, Michael J [ORNL; Demko, Jonathan A [ORNL; Roden, Mark L [ORNL; Maguire, J. F. [American Superconductor Corporation, Westborough, MA; Weber, C. S. [SuperPower Incorporated, Schenectady, New York

2008-01-01

84

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

85

Investigation of Cable Insulation and Mechanical Properties of Niobium-Tin Composite  

Microsoft Academic Search

As a part of the Fermilab high field NbâSn dipole development program, various issues of;\\u000amagnet technology are being investigated. In cable insulation development, S-2 fiber glass;\\u000asleeve and a new ceramic insulation developed by Composite Technology Development Inc.;\\u000a(CTD) were studied as a possible candidates. For each type of insulation, NbâSn ten-stack;\\u000asamples were reacted and then vacuum impregnated

D. R. Chichili; T. T. Arkan; I. Terechkine

1999-01-01

86

Equipment Qualification Research Test of Electrical Cable with Factory Splices and Insulation Rework Test No. 2 Report No. 1.  

National Technical Information Service (NTIS)

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 ...

E. E. Minor D. T. Furgal

1982-01-01

87

Vacuum brazing of Inconel 600 sleeve to 316L stainless steel sheath of mineral insulated cable  

Microsoft Academic Search

In mineral insulated (MI) triaxial cables for detectors, the 200?m thick zirconiated copper conductors are sheathed with 200?m thick 316L stainless steel (SS). The process conditions for high-temperature vacuum brazing of Inconel 600 sleeves to 316L SS cable sheath, with a radial gap of 125–150?m between them, has been optimised using 40?m thick nickel-base BNi2 brazing alloy. The brazed joints,

G. Srinivasan; A. K. Bhaduri; S. K. Ray; V. Shankar

2008-01-01

88

Characterization of the thermo-mechanical behavior of insulated cable stacks representative of accelerator magnet coils  

Microsoft Academic Search

A key issue in the design and fabrication of superconducting accelerator magnets is the detailed knowledge of the thermo-mechanical properties of their components. Measurements have been performed on straight stacks of Rutherford-type cables representative of magnet coils. The investigated samples are made up of NbTi and Nb3Sn cables, insulated with quartz-fiber tapes and vacuum-impregnated with epoxy resin. The characterization includes

M. Reytier; A. Devred; M. Durante; C. Gourdin; P. Vedrine

2001-01-01

89

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

90

Safety research of insulating materials of cable for nuclear power generating station  

NASA Technical Reports Server (NTRS)

The polymers PE, EPR, PVC, Neoprene, CSP, CLPE, EP and other similar substances are frequently used as insulation and protective covering for cables used in nuclear power generating stations. In order to test these materials for flame retardation, environmental resistance, and cable specifications, they were given the cable normal test, flame test, chemical tests, and subjected to design analysis and loss of coolant accident tests. Material was collected on spark tests and actual experience standards were established through these contributions and technology was accumulated.

Lee, C. K.; Choi, J. H.; Kong, Y. K.; Chang, H. S.

1988-01-01

91

A sensitivity approach to the sizing of insulated power cables in low and medium voltage electrical power distribution systems  

Microsoft Academic Search

The sizing of insulated power cables for use in electrical power distribution systems is based on definite engineering criteria. Cable or conductor size for a given current loading (ampacity) is the cross-sectional area or size of the current carrying portion of the cable, namely the conductor expressed in AWG (American Wire Gauge) or KCM (Kilocircular mils). The most commonly used

A. K. Hiranandani

1989-01-01

92

Equipment qualification research test of electrical cable with factor splices and insulation rework: Test no. 2, report no. 1  

Microsoft Academic Search

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

E. E. Minor; D. T. Furgal

1982-01-01

93

Computation of the Electric Field in Cable Insulation in the Presence of Water Trees and Space Charge  

Microsoft Academic Search

The presence of space charge changes locally the electric field distribution in power cable insulation and may play an important role in tree development, thus accelerating the dielectric breakdown. This paper is concerned with the computation of the electric field in polyethylene-insulated power cables affected by water trees which grow from the following: 1) the inner semiconducting layer; 2) the

Cristina Stancu; Petru V. Notingher; Florin Ciuprina; JÉrÔme Castellon; Serge Agnel; Alain Toureille

2009-01-01

94

Properties of plastic tapes for cryogenic power cable insulation  

Microsoft Academic Search

A superconducting ac power transmission cable is under development at Brookhaven National Laboratory (BNL). This project was undertaken in 1972 in response to growing national power requirements. The goal of this program is to develop an underground power transmission system suitable for transferring bulk quantities of electricity over distances of 16 to 160 km. Both the capital investment and operating

1978-01-01

95

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

96

Equipment qualification research test of electrical cable with factor splices and insulation rework: Test no. 2, report no. 1  

NASA Astrophysics Data System (ADS)

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

97

Determination of lead oxide and sulfate content in polyvinyl chloride used for cable insulation  

SciTech Connect

The purpose of this paper is to develop a rapid and reproducible procedure for determining lead as the key component of polyvinyl chloride (PVC) stabilizers, used for cable insulation. To develop this method, the authors paid attention also to the effect of the other inorganic ions present in the insulation. Lead ions can be determined complexometrically using xylenol orange as an indicator. The authors efforts to determine lead in the inorganic residue of cable insulation by direct titration with EDTA solution did not yield satisfactory results due to the difficulty in pinpointing the moment of color change at the end of the titration, so the authors employed back titration, binding lead(II) into a stable complex of lead by treating the mixture with an excess of EDTA under heating, and determining this excess by titration with a standard solution of lead (nitrogen trioxide). Since complexometric determination is carried out in an acidic medium, Al(III), Fe(III), and Cu(II) are titrated together with lead ions. The authors recommend this method for separate determinations of lead oxide and sulfate determination in PVC used for cable insulation.

Popova, E.M.; Dimitrova, V.T.; Tsonkova, S.D.; Kulev, I.I.

1987-03-01

98

Failure Modes and Condition Assessment of High Voltage Oil Filled XLPE Terminations  

Microsoft Academic Search

Oil filled terminations for high voltage XLPE cables (> 36 kV) have been used for more than four decades in Norway. The service experience is generally very good. However, some severe faults have occurred. The causes of several of these faults have been surveyed and the main results will be presented in this paper. One of the most common observed

K. B. Liland; A. Kornberg Bjørke; S. Hvidsten; H. Faremo; E. Bjerkan

2009-01-01

99

Characterization of failed solid-dielectric cables: Phase 2, Final report  

SciTech Connect

Eight field-aged cross-linked polyethylene (XLPE)-insulated 15 kV cables, consisting of two groups of four cables differing in age and wall thickness, were excavated and provided for testing by the utilities participating in this study. Each group covered a range of operating electrical stress. Degradation in these cables was determined by measurements of ac breakdown strength. Insulation specimens removed from the cables were studied in the laboratory to characterize the presence or absence of antioxidants, peroxide decomposition products, other volatiles as could be identified, and morphological features. Most of the field-aged cables contained high levels of volatiles that has coalesced in some cases to produce a halo in freshly exposed cross sections. The volatile contents of the insulations and their ac breakdown strengths were found to be inversely correlated by a power-law relationship. Significantly, ac breakdown strength for insulations containing halos were found to correlate inversely with operating electrical stress; no correlation was found for the cables not containing halos or for the complete population of eight cables. The combined influence of age and thinner insulation wall appeared to lead to lower breakdown strength, although the effect was small as compared to that of residual volatile content. 12 refs., 1 fig., 2 tabs.

Stember, L.H.; Derringer, G.C.; Epstein, M.M.; Gaines, G.B.; Hassell, J.A.; Hattery, G.R.; Thomas, R.E.

1987-09-01

100

MgO insulated coaxial instrument cable development for FFTF in-vessel temperature and voltage conditions  

Microsoft Academic Search

MgO insulated nuclear instrument cable designed for use in the Fast Flux Test Facility or breeder reactor in-vessel service environments were successfully tested to temperatures to 650°C. Breakdown Pulse Noise (BPN) thresholds in excess of 800 Vdc at 650°C were achieved on the bulk cable; cable resistivities at 650°C were 10 ft. The effect of 1000°C annealing was a minimal

A. I. Y. Chan; C. P. Cannon

1978-01-01

101

IFSMTF experiences and conclusions regarding the use of Kapton insulated, high-voltage cable in a vacuum/cryogenic environment  

SciTech Connect

This paper describes the experiences of the International Fusion Superconducting Magnet Test Facility (IFSMTF), formerly called the Large Coil Test Facility, with regard to the use of Kapton insulated cable for high-voltage instrumentation within the IFSMTF vacuum vessel. Initial high-potential tests performed on the General Dynamics electrical system were disappointing and led to a general review and subsequent change of the philosophy and technology associated with the use of Kapton insulated cable.

Wilson, C.T. Jr.; Luton, J.N. Jr.; Shen, S.S.

1985-01-01

102

Partial discharge performance of lapped plastic insulation for superconducting power transmission cables and the dielectric strength of supercritical helium gas  

Microsoft Academic Search

A superconducting power transmission cable was designed using a flexible ac cable with Nb3Sn superconductor force cooled by supercritical helium. A lapped, multilayer plastic tape construction was selected for the electrical insulation with supercritical helium gas filling the butt spaces between tapes. Evaluation of many different tapes showed biaxially oriented laminated polypropylene tape to be a promising dielectric. A series

A. J. Pearmain; M. Kosaki; R. A. Thomas

1978-01-01

103

Insulation enhancement with heat-shrinkable components. III. Shielded power cable  

Microsoft Academic Search

For pt.II see ibid., vol.7, no.3, p.16 (1991). Heat-shrinkable accessories for shielded power cable, including details of the necessary components for reliable terminations and joints, are described. The key functions of terminations are outlined, and the requirements for stress control, external leakage insulation, and environmental sealing and how they are met and examined. A similar discussion for joints focuses on

Jeffry P. Mackevich; John W. Hoffman

1991-01-01

104

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

105

A study of variations in dipole cable insulation systems and their effect on creep  

SciTech Connect

In late 1991 the Fermilab Manufacturing Group was directed by the Superconducting Super Collider Laboratory (SSCL) to investigate, build and test a series of magnets utilizing a low temperature cured all polyimide insulating system. Since an all polyimide insulated system was suspected to have higher post-collared stress relaxation than the existing glass tape system, a study was initiated to find ways to minimize the stress relaxation. For the study six different polyimide films possessing different modulus characteristics, coated with either 3M type 2290 Epoxy or Allied Signals Cryorad were wrapped onto five inch pieces of 50 mm inner cable in various combinations and in various build-ups. Ten of these wrapped cable segments were made into vertical stacks and cured with a low temperature cure cycle of approximately 290[degrees]F. The curing cycles were carefully reproduced for each sample. Samples were run with constant cure pressures of both 6 K psi and 10 K psi. These stacks were then measured for creep at a constant pressure of 12 K psi for one hour and for modulus of elasticity using the size delta between 8 K psi and 12 K psi. The results of this data as compared to the glass tape base line are resented here.

Sims, R.; Spindel, A. (Superconducting Super Collider Lab., Dallas, TX (United States)); Bossert, R.; Hoffman, J.; Schmidt, P.; Strait, J. (Fermi National Accelerator Lab., Batavia, IL (United States))

1993-05-01

106

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

107

Equipment qualification research test of electrical cable with factory splices and insulation rework Test No. 2, Report No. 2. [PWR; BWR  

Microsoft Academic Search

Electric cables with fire-retardant chemically crosslinked polyolefin extruded insulation containing factory-made center-conductor splices and insulation repairs manufactured by General Electric Company were used in a methodology test of the IEEE Standard 383-1974. This standard is concerned with the ability of cables to function during and following exposure to aging and LOCA\\/MSLB environments. Cable specimens were radiation aged at a low-dose

E. E. Minor; D. T. Furgal

1982-01-01

108

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

109

MgO Insulated Coaxial Instrument Cable Development for FFTF in-Vessel Temperature and Voltage Conditions.  

National Technical Information Service (NTIS)

MgO insulated nuclear instrument cable designed for use in the Fast Flux Test Facility or breeder reactor in-vessel service environments were successfully tested to temperatures to 650 exp 0 C. Breakdown Pulse Noise (BPN) thresholds in excess of 800 Vdc a...

A. I. Y. Chan C. P. Cannon

1978-01-01

110

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

111

Optimization of cable terminations  

SciTech Connect

This paper describes a study of various termination constructions for medium voltage cross-linked polyethylene (XLPE) cables. A special device was used for electrical field measurements around the cable termination which made it possible to monitor how stress relief materials with different permittivity and placement of isolated or grounded embedded electrodes (EE) affected electrical stress grading. The results of measurements for each configuration were examined by mathematical modeling based on the finite element method (FEM). Finally, the selected constructions of cable termination have passed severe test conditions with load cycling.

Nikolajevic, S.V. [Electric Power Distribution Co., Belgrade (Yugoslavia)] [Electric Power Distribution Co., Belgrade (Yugoslavia); Pekaric-Nad, N.M. [Faculty of Technical Sciences, Novi Sad (Yugoslavia)] [Faculty of Technical Sciences, Novi Sad (Yugoslavia); Dimitrijevic, R.M. [Cable Factory, Jagodina (Yugoslavia)] [Cable Factory, Jagodina (Yugoslavia)

1997-04-01

112

Coaxial cable connector  

NASA Technical Reports Server (NTRS)

A coaxial cable connector is provided, which resists radio frequency breakdown in coaxial cables used in the vacuum of outer space. The connector body surrounds an insulator which includes an easily compressible elastomeric portion. An insulated coaxial cable is prepared so that its insulation projects beyond the outer conductor and compresses the elastomeric portion of the connector insulator.

Caro, Edward R. (inventor); Bonazza, Walter J. (inventor)

1987-01-01

113

The selection of the frequency range for high-voltage on-site testing of extruded insulation cable systems  

Microsoft Academic Search

High-voltage on-site tests of extruded insulation cables are necessary to check the quality of the installation of the system. The test voltage should simulate the stress under service conditions, and generate the same failure mechanism. With respect to an optimum design of test systems, a frequency range of 20 to 300 Hz, proposed in the latest IEC Draft for on-site

E. Gockenbach; W. Hauschild

2000-01-01

114

Conductive cable fibers with insulating surface prepared by coaxial electrospinning of multiwalled nanotubes and cellulose.  

PubMed

Core-sheath multiwalled carbon nanotube (MWNT)-cellulose fibers of diameters from several hundreds of nanometers to several micrometers were prepared by coaxial electrospinning from a nonvolatile, nonflammable 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 dissolved in the same IL. Electrospun fibers were collected in a coagulation bath containing ethanol-water to remove the IL completely and dried to form 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 because of a conductive pathway of bundled 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

2010-09-13

115

Equipment qualification research test of electrical cable with factory splices and insulation rework Test No. 2, Report No. 2. [PWR; BWR  

SciTech Connect

Electric cables with fire-retardant chemically crosslinked polyolefin extruded insulation containing factory-made center-conductor splices and insulation repairs manufactured by General Electric Company were used in a methodology test of the IEEE Standard 383-1974. This standard is concerned with the ability of cables to function during and following exposure to aging and LOCA/MSLB environments. 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. Subsequent 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 exposures to observe sequence-related and dose-rate-related material degradation.

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

1982-09-01

116

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

117

Current redistribution and stability of superconducting triplex cable without electrical insulation carrying non-uniform current  

NASA Astrophysics Data System (ADS)

When a small normal zone is produced in a strand in a superconducting cable by a local disturbance, current redistribution occurs and can help the recovery of its superconducting state. This effect of the current redistribution depends on the initial current distribution. In this paper, the initial current distribution in a triplex cable is controlled artificially to study its influence on the stability against local disturbances. A heat pulse is applied to a strand by a carbon paste heater to initiate the quench. Transient current distributions during quench or recovery process are measured by sets of Hall sensors placed at several locations along the cable axis. When the transport current is less than a threshold value, the stability is improved by the current redistribution from the heated strand to the others, even if the initial current distribution is not uniform. This threshold is related to the current margin of the heated strand, rather than to the current margin of the whole cable. Above this threshold current, the MQE against local disturbances is smaller in the cable with the non-uniform current distribution than in the cable with the uniform current distribution, when the total transport current is identical. If the current of the heated strand is identical and above the threshold, the MQE against local disturbances does not depend on the current distribution and agrees with the MQE of the single isolated strand. It means that the quench of one strand leads to the quench of the cable, and that the stability of one strand in the cable is not influenced by interaction with the others.

Amemiya, N.; Yonekawa, H.; Kobayashi, E.; Ogitsu, T.; Sasaki, K.; Ohuchi, N.; Tsuchiya, K.; Shintomi, T.

2003-03-01

118

Heat transfer through the flat surface of Rutherford superconducting cable samples with novel pattern of electrical insulation immersed in He II  

NASA Astrophysics Data System (ADS)

Future accelerator magnets will be exposed to heat loads that exceed even by an order of magnitude presently observed heat fluxes transferred to superconducting magnet coils. To avoid the resistive transition of the superconducting cables, the efficiency of heat transfer between the magnet structure and the helium must be significantly increased. This can be achieved through the use of novel concepts of the cable’s electrical insulation wrapping, characterized by an enhanced permeability to helium while retaining sufficient electrical resistivity. This paper presents measurement results of the heat transfer through Rutherford NbTi cable samples immersed in a He II bath and subjected to the pressure loads simulating the counteracting of the Lorentz forces observed in powered magnets. The Rutherford cable samples that were tested used different electrical insulation wrapping schemes, including the scheme that is presently used and the proposed scheme for future LHC magnets. A new porous polyimide cable insulation with enhanced helium permeability was proposed in order to improve the evacuation of heat form the NbTi coil to He II bath. These tests were performed in a dedicated Claudet-type cryostat in pressurized He II at 1.9 K and 1 bar.

Strychalski, M.; Chorowski, M.; Polinski, J.

2014-05-01

119

Splicing shielded cables  

NASA Technical Reports Server (NTRS)

Simple repair technique retains cable characteristic impedance. Shielded-Cable Splicing Technique retains cable characteristic impedance. Procedure involves splicing inner conductors in staggered pattern, installing jumper braid by heat-shrinking two solder sleeves, and placing insulation sleeve over repaired section and heat-shrinking it. Two possible insulation materials are modified polyvinylidene fluoride and polytetrafluoroethylene.

Lind, W. P.; Mcgougan, W. R.

1979-01-01

120

Crosslinking of polyolefin insulation of cables and insulated wires by the use of energy-rich radiation. Part 1: material of irradiation. Final report, March 1980  

Microsoft Academic Search

Polyolefins were selected that are crosslinkable by radiation including the copolymers of ethylene and polyolefin elastomer blends. Effective stabilizing systems against thermo-oxidative ageing and copper-catalized oxidation were developed. The influence of crosslink-reforcing, coagents fillers, and pigments was studied. For the materials XLPE, EPR and EVA the optimization of compounds in a scope of production trials resulted in useful proposals for

D. Pieper; A. Schillmoeller

1981-01-01

121

Lightweight electric power cable  

Microsoft Academic Search

A TPE (Elexar 8614Z) material was selected from several candidates for evaluation in completed cable form. A second cable with higher heat resistance capability, using silicone insulation, was also evaluated. The objective was to produce a finished cable with a weight savings of 15% or better, with no loss of significant properties from the standard cable specified by Drawing 13222E8995.

I. N. Dwyer; C. J. Oneil; W. G. Wood; D. P. Davia

1982-01-01

122

Polymeric HVDC Cable Design and Space Charge Accumulation. Part 1: Insulation\\/Semicon Interface  

Microsoft Academic Search

From theory and experiments, it can be deduced that materials for DC applications should not accumulate a large amount of space charge if accelerated degradation of the insulation system is to be avoided. Therefore, the characterization of DC insulation must take into account the evaluation of space charge accumulation. This cannot be done exhaustively without taking a system approach considering

D. Fabiani; G. C. Montanari; C. Laurent; G. Teyssedre; P. H. F. Morshuis; R. Bodega; L. A. Dissado; A. Campus; U. H. Nilsson

2007-01-01

123

Recycling of Insulated Wire and Cable and Technologies for Low Environmental Impact  

NASA Astrophysics Data System (ADS)

Recycling works of electric wire and cable material in Japan are surveyed. The recycle-ratio of conductor materials is very high, but that of covering materials is very low, about 30%. Therefore the separation technologies of covering materials have been developed; one is static electric-field separation and another is hydro-cyclones separation. The products from waste covering materials are introduced as a material recycling, the thermal recycling methods and new technologies are also mentioned.

Tazawa, Sachio

124

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

125

Mitsubishi Cable Industries Review, No. 75, April 1988.  

National Technical Information Service (NTIS)

The review includes reports on: Developments of new ultrathin fiberscopes for medical use; Field test of 275 kV internally water-cooled XLPE cable system with stainless steel coolant tube and wire shield; On the improvement of impulse breakdown strength i...

1988-01-01

126

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

127

Space charge measurement in dc cable materials  

Microsoft Academic Search

This project was designed to determine the amounts and distributions of space charge in dc-stressed polymer materials commonly used as insulation in solid, extruded polymer-insulated, high voltage, transmission and distribution, power cables. The purpose of the work is to inform insulation and cable makers about special requirements that dc stress places on insulation properties in such cables. The work included:

M. G. Broadhurst; A. S. De Reggi

1991-01-01

128

The influence of additives on the space charge formation and charge profiles in XLPE  

Microsoft Academic Search

Experiments were conducted to measure the space charge profiles in XLPE containing anti-oxidants to examine the origin of heterocharge creation. Negative heterocharge in the vicinity of positive electrode in XLPE containing PDP (Peroxide Decomposition Products) was discoverd to be greatly influenced by the kind of anti-oxidant in XLPE. It is concluded that the synergistic effect between PDP and some kinds

Tatsuya Fukuyama; Takashi Nakui; Yasuo Sekii; Takashi Maeno

2000-01-01

129

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

130

Manufacture and Insulating Test of a Mini-Model for 154 kV-Class HTS Cables  

Microsoft Academic Search

High-temperature superconductor (HTS) power cables enable larger transmission of electrical power than that of the conventional counterparts. As electrical power consumption is increased, HTS power cables are expected to play an important role in a next generation electrical power transmission grid because of their smaller transmission loss and, in consequence, better efficiency of operational cost. Currently, a world-wide research has

Jin-Wook Choi; Jae-Hyeong Choi; Hae-Jong Kim; Jeonwook Cho; Sang-Hyun Kim

2009-01-01

131

Electrical conduction of XLPE with vacuum degassed semiconductive electrodes  

Microsoft Academic Search

It has been found that the electrical conduction characteristics of polyethylene are influenced strongly by the vacuum treatment of cross-linked polyethylene (XLPE) and\\/or semiconductive electrodes. The major changes due to the vacuum treatment of these materials are the suppression in the rate of change of current density at some field range and the change of conduction mechanisms from the SCLC

K. S. Suh; C. R. Lee; Min-Koo Han

1992-01-01

132

TSDC investigations of thermally and electro-thermally aged cable models  

Microsoft Academic Search

Classical TSD and fractional polarisation analyses were carried out on unaged and aged XLPE cable models from -120°C to 120°C and three relaxation processes were found. A low temperature process, identified as ? relaxation and ascribed to the polar groups attached to the polymer chains in the amorphous region, gets stronger with duration of the aging and can be mainly

S. M. Gubanski; G. C. Montanari; A. Motori

1994-01-01

133

Characterization of Ageing for MV Power Cables Using Low Frequency Tan ? Diagnostic Measurements  

Microsoft Academic Search

This paper describes very low frequency (VLF) tan delta experiments performed on field-aged and non-aged distribution medium voltage (MV) cable samples. The field aged samples constitute a uniform set of Cross-linked Polyethylene (XLPE) of 15 kV unjacketed cables removed from the same service area having experienced similar operating and ageing conditions. The non-aged samples are a diverse set of crosslinked

J. C. Hernández-Mejía; R. Harley; N. Hampton; R. Hartlein

2009-01-01

134

A study of relationship between mechanical properties and water treeing retardation in EVA blended XLPE  

Microsoft Academic Search

The authors report the relationship between the water tree retardation phenomena and the mechanical properties in ethylene vinyl acetate (EVA) blended XLPE (cross-linked polyethylene). They also studied the electrical properties, such as the dissipation factor and the AC breakdown strength. It has been found that, by blending with EVA, growth of water trees in XLPE is retarded considerably and the

J.-H. Lee; M.-K. Han; K. S. Suh; Y.-H. Choi

1992-01-01

135

The effects of material properties and inclusions on the space charge profiles of LDPE and XLPE  

Microsoft Academic Search

The effects of material properties and inclusions on the space charge profiles in LDPE and XLPE were examined. Whereas the charge profile in LDPE is influenced by material properties such as the degree of crystallinity and MFR, the charge profile in XLPE is influenced by inclusions in the material such as acetophenone, moisture and various kinds of phenolic antioxidant. In

Y. Sekii; T. Ohbayashi; T. Uchimura; U. Mochizuki; T. Maeno

2002-01-01

136

Flammability of radiation cross-linked low density polyethylene as an insulating material for wire and cable  

Microsoft Academic Search

Various formulations of low-density polyethylene blended with ethylene vinyl acetate were prepared to improve the flame retardancy for wire and cable applications. The prepared formulations were cross-linked by ?-rays to 50, 100, 150 and 200kGy in the presence of trimethylolpropane triacrylate (TMPTA). The effect of thermal aging on mechanical properties of these formulations were investigated. In addition, the influence of

A. A. Basfar

2002-01-01

137

21 CFR 890.1175 - Electrode cable.  

Code of Federal Regulations, 2013 CFR

...Diagnostic Devices § 890.1175 Electrode cable. (a) Identification. An electrode cable is a device composed of strands of insulated electrical conductors laid together around a central core and intended for medical purposes to connect an...

2013-04-01

138

Coaxial cable connector  

US Patent & Trademark Office Database

An in-line connector for coaxial connectors, which enables two flush cut cables to be spliced together without further cutting of the cable's insulator or outer conductor jacket. A longitudinal connector has an internal concentrically mounted wire connector which contacts the inner wire conductor of each cable to be spliced. A pair of metallic sleeves extend from the conductor and are inserted into each cable to make contact with the woven metallic sheath of each cable. A collapsible sleeve is concentrically mounted to each end of the connector and engages the connector to inhibit relative rotation. A lock nut threadably engages each of the collapsible sleeves to cover the connection and secure each cable to the connector.

1999-03-30

139

Investigation Of Dielectric Behaviors Of Nanoclay Filled Epoxy And PP\\/NYLON66 Nanocomposites For Cable Insulation Application  

Microsoft Academic Search

High performance polymer nanocomposites are emerging as a new class of materials for its demanding applications as insulating material. The outstanding properties of nanoclay make them an attractive candidate for preparing advanced composite materials with multi functional features for electrical and electronics applications. A series of nanoclay incorporated epoxy and polypropylene\\/nylon66 (50\\/50 blend) nanocomposites have been prepared via chemical and

Rashmi Rashmi; N. M. Renukappa; Siddaramaiah Siddaramaiah

2010-01-01

140

Cable Diagnostic Focused Initiative  

SciTech Connect

This report summarizes an extensive effort made to understand how to effectively use the various diagnostic technologies to establish the condition of medium voltage underground cable circuits. These circuits make up an extensive portion of the electric delivery infrastructure in the United States. Much of this infrastructure is old and experiencing unacceptable failure rates. By deploying efficient diagnostic testing programs, electric utilities can replace or repair circuits that are about to fail, providing an optimal approach to improving electric system reliability. This is an intrinsically complex topic. Underground cable systems are not homogeneous. Cable circuits often contain multiple branches with different cable designs and a range of insulation materials. In addition, each insulation material ages differently as a function of time, temperature and operating environment. To complicate matters further, there are a wide variety of diagnostic technologies available for assessing the condition of cable circuits with a diversity of claims about the effectiveness of each approach. As a result, the benefits of deploying cable diagnostic testing programs have been difficult to establish, leading many utilities to avoid the their use altogether. This project was designed to help address these issues. The information provided is the result of a collaborative effort between Georgia Tech NEETRAC staff, Georgia Tech academic faculty, electric utility industry participants, as well as cable system diagnostic testing service providers and test equipment providers. Report topics include: •How cable systems age and fail, •The various technologies available for detecting potential failure sites, •The advantages and disadvantages of different diagnostic technologies, •Different approaches for utilities to employ cable system diagnostics. The primary deliverables of this project are this report, a Cable Diagnostic Handbook (a subset of this report) and an online knowledge based system (KBS) that helps utilities select the most effective diagnostic technologies for a given cable circuit and circuit conditions.

Hartlein, R.A.; Hampton, R.N.

2010-12-30

141

Process of modifying a cable end  

DOEpatents

End moldings for high-voltage cables are described wherein the dielectric insulator of the cable is heated and molded to conform to a desired shape. As a consequence, high quality substantially bubble-free cable connectors suitable for mating to premanufactured fittings are made. Disclosed are a method for making the cable connectors either in the field or in a factory, molds suitable for use with the method, and the molded cable connectors, themselves.

Roose, Lars D. (Albuquerque, NM)

1995-01-01

142

Process of modifying a cable end  

DOEpatents

End moldings for high-voltage cables are described wherein the dielectric insulator of the cable is heated and molded to conform to a desired shape. As a consequence, high quality substantially bubble-free cable connectors suitable for mating to premanufactured fittings are made. Disclosed are a method for making the cable connectors either in the field or in a factory, molds suitable for use with the method, and the molded cable connectors, themselves. 5 figs.

Roose, L.D.

1995-08-01

143

Flammability of radiation cross-linked low density polyethylene as an insulating material for wire and cable  

NASA Astrophysics Data System (ADS)

Various formulations of low-density polyethylene blended with ethylene vinyl acetate were prepared to improve the flame retardancy for wire and cable applications. The prepared formulations were cross-linked by ?-rays to 50, 100, 150 and 200 kGy in the presence of trimethylolpropane triacrylate (TMPTA). The effect of thermal aging on mechanical properties of these formulations were investigated. In addition, the influence of various combinations of aluminum trihydroxide and zinc borate as flame retardant fillers on the flammability was explored. Limiting oxygen index (LOI) and average extent of burning were used to characterize the flammability of investigated formulations. An improved flame retardancy of low density polyethylene was achieved by various combinations of flame ratardant fillers and cross-linking by gamma radiation.

Basfar, A. A.

2002-03-01

144

LOCA testing of damaged cables  

SciTech Connect

Experiments were conducted to assess the effects of dielectric withstand voltage 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 cables. During aging and LOCA testing, Okonite ethylene propylene rubber cables with a bonded jacket experienced unexpected failures. The failures appear to be primarily related to the level of thermal aging. For Brand Rex crosslinked polyolefin cables, the results suggest that 8 mils of insulation remaining should give the cables a high probability of surviving accident exposure following aging. The voltage levels necessary to detect when 8 mils of insulation remain are expected to be roughly 40 kVdc. This voltage level would almost certainly be unacceptable to a utility for use as a damage assessment tool. Although two Rockbestos silicone rubber cables failed during the accident test, the induced wall thickness did not seem to be the major cause of the failures. It appears likely that under less stressful thermal aging conditions, the cables would survive accident testing with as little as 4 mils or less of insulation remaining.

Vigil, R.A. (Science and Engineering Associates, Inc., Albuquerque, NM (United States)); Jacobus, M.J.; Nelson, C.F. (Sandia National Labs., Albuquerque, NM (United States))

1992-01-01

145

LOCA testing of damaged cables  

SciTech Connect

Experiments were conducted to assess the effects of dielectric withstand voltage 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 cables. During aging and LOCA testing, Okonite ethylene propylene rubber cables with a bonded jacket experienced unexpected failures. The failures appear to be primarily related to the level of thermal aging. For Brand Rex crosslinked polyolefin cables, the results suggest that 8 mils of insulation remaining should give the cables a high probability of surviving accident exposure following aging. The voltage levels necessary to detect when 8 mils of insulation remain are expected to be roughly 40 kVdc. This voltage level would almost certainly be unacceptable to a utility for use as a damage assessment tool. Although two Rockbestos silicone rubber cables failed during the accident test, the induced wall thickness did not seem to be the major cause of the failures. It appears likely that under less stressful thermal aging conditions, the cables would survive accident testing with as little as 4 mils or less of insulation remaining.

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

1992-12-31

146

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

147

Investigation Of Dielectric Behaviors Of Nanoclay Filled Epoxy And PP/NYLON66 Nanocomposites For Cable Insulation Application  

NASA Astrophysics Data System (ADS)

High performance polymer nanocomposites are emerging as a new class of materials for its demanding applications as insulating material. The outstanding properties of nanoclay make them an attractive candidate for preparing advanced composite materials with multi functional features for electrical and electronics applications. A series of nanoclay incorporated epoxy and polypropylene/nylon66 (50/50 blend) nanocomposites have been prepared via chemical and melt mixing methods respectively. The fabricated nanocomposites have been characterized for dielectric behaviors such as dielectric constant (?r) and dissipation factor (tan ?). The effect of filler content, frequency, temperature and sea water ageing on dielectric behavior of nanocomposites has been investigated. The variation in the diffusion coefficient (D) of the material aged in water at different temperature with different percentage of nanoclay loaded epoxy and PP/nylon66 nanocomposites were calculated. It is observed that at increase in ageing temperature relatively increases the diffusion coefficient of the material. The measured dielectric results of the nanocomposites reveals that a significant influence of frequency and sea water ageing and marginal change with temperature. Higher dielectric constant was noticed for epoxy nanocomposites as compared to PP/nylon66 composites

Rashmi, Rashmi; Renukappa, N. M.; Siddaramaiah, Siddaramaiah

2010-10-01

148

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

149

Magnetically Loaded Cables.  

National Technical Information Service (NTIS)

A novel cable design is presented which employes an insulation doped with low loss soft ferrite particles that provide distributed inductive loading. Mn-Zn ferrites are more suitable below 1MHz and Ni-Zn above that frequency. Different configurations are ...

S. D. Dadakarides B. B. Lusignan

1986-01-01

150

Electric Submersible Pump Cable Standards and Specifications Preview  

Microsoft Academic Search

Electric submersible pump cable is a specialized product for deep well application. Different environments require various configurations. A synopsis is presented of pending standard specifications for the two most common designs. These are a round cable using polypropylene insulation and another using ethylene propylene rubber insulation. A review of the pending guide for testing these cables is also included.

Marcus O Durham; Joe Vandevier

1984-01-01

151

7 CFR 1755.200 - RUS standard for splicing copper and fiber optic cables.  

Code of Federal Regulations, 2010 CFR

...RUS standard for splicing copper and fiber optic cables. 1755.200 Section 1755...RUS standard for splicing copper and fiber optic cables. (a) Scope. (1) This...splicing plastic insulated copper and fiber optic cables. Typical applications of...

2005-01-01

152

7 CFR 1755.200 - RUS standard for splicing copper and fiber optic cables.  

Code of Federal Regulations, 2010 CFR

...RUS standard for splicing copper and fiber optic cables. 1755.200 Section 1755...RUS standard for splicing copper and fiber optic cables. (a) Scope. (1) This...splicing plastic insulated copper and fiber optic cables. Typical applications of...

2001-01-01

153

7 CFR 1755.200 - RUS standard for splicing copper and fiber optic cables.  

Code of Federal Regulations, 2010 CFR

...RUS standard for splicing copper and fiber optic cables. 1755.200 Section 1755...RUS standard for splicing copper and fiber optic cables. (a) Scope. (1) This...splicing plastic insulated copper and fiber optic cables. Typical applications of...

2006-01-01

154

7 CFR 1755.200 - RUS standard for splicing copper and fiber optic cables.  

Code of Federal Regulations, 2010 CFR

...RUS standard for splicing copper and fiber optic cables. 1755.200 Section 1755...RUS standard for splicing copper and fiber optic cables. (a) Scope. (1) This...splicing plastic insulated copper and fiber optic cables. Typical applications of...

2012-01-01

155

7 CFR 1755.200 - RUS standard for splicing copper and fiber optic cables.  

Code of Federal Regulations, 2010 CFR

...RUS standard for splicing copper and fiber optic cables. 1755.200 Section 1755...RUS standard for splicing copper and fiber optic cables. (a) Scope. (1) This...splicing plastic insulated copper and fiber optic cables. Typical applications of...

2013-01-01

156

7 CFR 1755.200 - RUS standard for splicing copper and fiber optic cables.  

Code of Federal Regulations, 2010 CFR

...RUS standard for splicing copper and fiber optic cables. 1755.200 Section 1755...RUS standard for splicing copper and fiber optic cables. (a) Scope. (1) This...splicing plastic insulated copper and fiber optic cables. Typical applications of...

2004-01-01

157

7 CFR 1755.200 - RUS standard for splicing copper and fiber optic cables.  

Code of Federal Regulations, 2010 CFR

...RUS standard for splicing copper and fiber optic cables. 1755.200 Section 1755...RUS standard for splicing copper and fiber optic cables. (a) Scope. (1) This...splicing plastic insulated copper and fiber optic cables. Typical applications of...

1998-01-01

158

7 CFR 1755.200 - RUS standard for splicing copper and fiber optic cables.  

Code of Federal Regulations, 2010 CFR

...RUS standard for splicing copper and fiber optic cables. 1755.200 Section 1755...RUS standard for splicing copper and fiber optic cables. (a) Scope. (1) This...splicing plastic insulated copper and fiber optic cables. Typical applications of...

2011-01-01

159

7 CFR 1755.200 - RUS standard for splicing copper and fiber optic cables.  

Code of Federal Regulations, 2010 CFR

...RUS standard for splicing copper and fiber optic cables. 1755.200 Section 1755...RUS standard for splicing copper and fiber optic cables. (a) Scope. (1) This...splicing plastic insulated copper and fiber optic cables. Typical applications of...

1999-01-01

160

Micro ribbon cable bonding for an implantable device  

Microsoft Academic Search

Assembly and encapsulation is in many cases a restriction for miniaturizing microsystems. For implantable devices with a signal cable attached this is even more critical. This paper introduces assembly methods for a micro ribbon cable, focusing on insulation removal and cable-substrate bonding. Two different methods for stripping the cable are presented; the use of femto second laser and by plasma

Kristin Imenes; Knut Aasmundtveit; G. Bjornsen; P. Moreno; J. R. V. de Aldana

2008-01-01

161

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

162

Semiannual report for the period October 1, 1979-March 31, 1980 of work on: (1) superconducting power transmission system development; (2) cable insulation development. Power Transmission Project Technical Note No. 106  

SciTech Connect

Progress is reported in a program whose objective 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, and would 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

1980-07-07

163

Termination of Flat Conductor Cable to NASA/Msfc Plugs.  

National Technical Information Service (NTIS)

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 conductor...

W. Angele

1972-01-01

164

Development of a flat cable system  

NASA Technical Reports Server (NTRS)

A flat conductor cabling system for electrical/electronic interwiring is described. Six major items comprise the system: the cables, splices - one for flat cable to round wires and one for flat cable to flat cable; a series of flat cable connectors; the distributor, which is used for interconnecting the circuits; and a repair technique for the falt cable. Polyarylene, a new high performance melt-processable insulation material, permits the design of a completely standardized, modular flat conductor flat cable. The development of an advanced heat-shrinkable plastics technology involving the use of selectively bonded plastic film has resulted in the multiple termination module, used for making high-reliability sealed solder terminations to either flat conductor cable or round wires. All necessary tools and application equipment are included in the system design.

Neel, R. M.

1972-01-01

165

Estimating the Remaining Life of Water-Treed XLPE Cable by VLF Voltage Withstand Tests  

Microsoft Academic Search

1) . In such cases the degradation signal from the water tree is extremely small, and such methods of diagnosing degradation have not been implemented on practical lines. The authors' attention was therefore drawn to voltage withstand testing as a method that enables both the detection of non-bridging water trees and the estimat- ing of the remaining life of a

Katsumi Uchida; Yoichi Kato; Masahiko Nakade; Daisuke Inoue; Hiroyuki Sakakibara; Hideo Tanaka

166

Effects of irradiation dose rate and thermal aging on changes in the properties of elastomeric materials (EPR-CSPE) for cable insulation and sheathing  

Microsoft Academic Search

In order to estimate cable service life in PWR plants, a research program has been established and performed on EPR\\/CSPE (ethylene-propylene rubber\\/chlorosulfonated polyethylene) LOCA (loss-of-coolant accident) cables based on a study of the dose and dose rate effects and the temperature. The authors present the results of accelerated tests and physicochemical studies (IR, mechanical properties, oxidation (EPR), and chlorine (CSPE)

Brigitte PINEL; V. Gueguen

1991-01-01

167

Cable Car  

NSDL National Science Digital Library

In this activity, learners string a line across the room and build cable cars that can move from on end to the other. Learners construct their cable cars out of wood sticks, motors, and electrical circuits. Use this activity to introduce how cable cars work as well as physics principles related to center of gravity, rotational motion, electricity, and motors.

Workshop, Watsonville E.

2011-01-01

168

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.

169

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

170

Superconducting Cable Termination  

DOEpatents

Disclosed is a termination that connects high temperature superconducting (HTS) cable immersed in pressurized liquid nitrogen to high voltage and neutral (shield) external bushings at ambient temperature and pressure. The termination consists of a splice between the HTS power (inner) and shield (outer) conductors and concentric copper pipes which are the conductors in the termination. There is also a transition from the dielectric tape insulator used in the HTS cable to the insulators used between and around the copper pipe conductors in the termination. At the warm end of the termination the copper pipes are connected via copper braided straps to the conventional warm external bushings which have low thermal stresses. This termination allows for a natural temperature gradient in the copper pipe conductors inside the termination which enables the controlled flashing of the pressurized liquid coolant (nitrogen) to the gaseous state. Thus the entire termination is near the coolant supply pressure and the high voltage and shield cold bushings, a highly stressed component used in most HTS cables, are eliminated. A sliding seal allows for cable contraction as it is cooled from room temperature to ˜72-82 K. Seals, static vacuum, and multi-layer superinsulation minimize radial heat leak to the environment.

Sinha, Uday K. (Carrollton, GA); Tolbert, Jerry (Newnan, GA)

2005-08-30

171

Space charge formation in XLPE-the influence of electrodes and pre-conditioning  

Microsoft Academic Search

The authors present space charge profiles for a range of XLPE planar samples under DC stress. Three different types of semiconductor electrodes were investigated, as well as vacuum evaporated Au. The samples were also subjected to three different heating\\/pumping pre-conditioning procedures. The space charge profiles in the unconditioned samples (heterocharge) were consistent with an apparent volume charge originating in a

R. J. Fleming; M. Henriksen; J. T. Holboll

1999-01-01

172

TIEMF effect in ceramic coated cables  

NASA Astrophysics Data System (ADS)

Our previous work on mineral insulated cables demonstrated the important voltages that can appear in some of the coils used in ITER magnetic diagnostics simply due to thermal gradients present from the beginning of operation. To explore alternative cables, a new type of ceramic coated wire has being studied. The two wires examined consist of Cu-Ni and SS 304 conductors covered with a thin ceramic coating. This should reduce cold working during fabrication. An improved technique has been used to measure TIEMF with a rather narrow thermal gradient and highly reduced noise, able to examine the fine structure due to inhomogeneities. For both cables, marked TIEMF effects still exist. Although their absolute magnitude is relatively similar there are important differences in structure. The implications for ITER cables and coils are discussed. The coated cables are compared with MI cables taking also into account insulation and mechanical reliability.

Vila, R.; Hodgson, E. R.

2009-04-01

173

Electrochemical Treeing in Cable. Final Report.  

National Technical Information Service (NTIS)

Results are presented of an investigation of electrochemical treeing in solid dielectric insulated cables performed between May, 1973 and March, 1977 for the Electric Power Research Institute. The purpose of the work was to establish the influence of vari...

N. Nagu inivas H. C. Deopken A. L. McKean M. C. Biskeborn

1978-01-01

174

Modified Spot Welder Solders Flat Cables  

NASA Technical Reports Server (NTRS)

Soldering device, essentially modified spot welder, melts high-melting-temperature solders without damaging plastic insulation on flat electrical cables. Solder preform rests on exposed conductor of cable, under connector pin. Electrodes press pin/preform/conductor sandwich together and supply pulse of current to melt preform, bonding pin to conductor. Anvil acts as support and heat sink. Device used to solder flexible ribbon cables to subminiature pin connectors.

Haehner, Carl L.

1992-01-01

175

Efficient FDTD simulation of fields in coaxial cables with multi-layered insulation partially formed by dispersive layers of extremely high permittivity  

Microsoft Academic Search

An efficient and accurate FDTD simulation technique for investigation of field propagation in multi-layered coaxial cables has been developed. This technique combines a uniform FDTD scheme with the piecewise linear recursive convolution method, which is applied for the treatment of fields in dispersive layers, having extremely high permittivity. The method has been developed and tested for a radial symmetric cylindrical

R. Jobava; R. Heinrich; D. Pommerenke; W. Kalkner; A. Gheonjian

2002-01-01

176

TIEMF effect in ceramic coated cables  

Microsoft Academic Search

Our previous work on mineral insulated cables demonstrated the important voltages that can appear in some of the coils used in ITER magnetic diagnostics simply due to thermal gradients present from the beginning of operation. To explore alternative cables, a new type of ceramic coated wire has being studied. The two wires examined consist of Cu–Ni and SS 304 conductors

R. Vila; E. R. Hodgson

2009-01-01

177

Shielded Aluminum Flat-Conductor Cable  

NASA Technical Reports Server (NTRS)

Thin wiring harness stores compactly. Flat aluminum conductors glued between layers of polyimide. Aluminum shield surrounds insulated conductors. Outer layer polyimide. Aluminum shield reduces flexibility of cable and cable withstand only limited number of repetitions of sharp bending at same spot.

Farina, S.

1984-01-01

178

High-temperature flat-conductor cable  

NASA Technical Reports Server (NTRS)

Temperature limit of 25-conductor signal cable and 3-conductor power cable, fabricated using woven and roll laminated technique, increased from 200 C to 350 C when polyimide/fluorinated ethylene propylene or polytetrafluoroethylene insulation films and fluorinated ethylene propylene as adhesive medium is applied.

Rigling, W. S.

1976-01-01

179

30 CFR 18.40 - Cable clamps and grips.  

Code of Federal Regulations, 2013 CFR

...APPROVAL OF MINING PRODUCTS ELECTRIC MOTOR-DRIVEN MINE EQUIPMENT...on the cable terminals of a machine. Also insulated clamps shall...cable or cord leading from a machine to a detached or separately...cables used for wiring around machines shall be provided in a...

2013-07-01

180

Yielding Cable Bolt for Mechanized Cable Bolting.  

National Technical Information Service (NTIS)

The main factors and mechanisms affecting the behavior of the cable bolt reinforcement were studied to obtain a more flexible cable bolt with improved cable bolt's displacement capacity. Adjustability in the cable bolt stiffness was particularly sought af...

I. Satola

2000-01-01

181

Comparative Testing of Shield Terminations of High Voltage Cables  

Microsoft Academic Search

In HV systems, cable terminations are one of the weakest links. They are especially stressed by the electric field in free space connections. In this light, several termination types for polyethylene HV cables were tested for dielectric strength and leakage current, down to a pico-ampere level. The tested terminations ranged from simple flush cut to graded insulation using non-linear insulation

Alex Pokryvailo; Costel Carp; Clifford Scapellati

2008-01-01

182

An investigation of the potential of ethylene vinyl acetate\\/polyethylene blends for use in recyclable high voltage cable insulation systems  

Microsoft Academic Search

Ethylene vinyl acetate (EVA) co-polymers can potentially provide novel materials for inclusion into extruded high voltage\\u000a cable systems, providing a degree of electrical conductivity whilst avoiding the dispersion problems associated with conventional\\u000a particulate fillers or conducting polymers. Although a degree of conductivity can decrease the electrical breakdown performance,\\u000a it can help to suppress the development of space charge and increase

I. L. Hosier; A. S. Vaughan; S. G. Swingler

2010-01-01

183

Laser Stripping of Coal Cables.  

National Technical Information Service (NTIS)

Kapton-insulated wire and miniature coax cables are usually stripped with guillotine-shaped blades. This method has the inherent risk of nicking wire strands. The CO sub 2 laser beam can cut through Kapton without damaging wire strands underneath. This pr...

D. L. Hollar

1982-01-01

184

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

185

Breakdown statistics for XLPE containing the volatile by-products of the cross-linking reaction  

Microsoft Academic Search

AC and impulse breakdown strengths have been measured on recessed samples of cross-linked polyethylene (XLPE) containing controlled amounts of the by-products (or residues) of the crosslinking reaction, i.e. acetophenone, cumyl alcohol, alpha methyl styrene, and cumene. The statistics used to describe the distribution of breakdown strengths are discussed. Weibull, Gumbel, and Gaussian statistics are compared. Other statistical distributions resulting from

D. H. Damon

1992-01-01

186

Cable design  

NASA Technical Reports Server (NTRS)

The importance of material selection is stressed in the design and manufacture of FCC. Several applications of flat conductor cable are discussed relative to material selection and the reasons for using a particular material for each application is explained.

Gerpheide, B. A.

1972-01-01

187

Cable manufacture  

NASA Technical Reports Server (NTRS)

A survey is presented of flat electrical cable manufacturing, with particular reference to patented processes. The economics of manufacture based on an analysis of material and operating costs is considered for the various methods. Attention is given to the competitive advantages of the several processes and their resulting products. The historical area of flat cable manufacture is presented to give a frame of reference for the survey.

Gamble, P.

1972-01-01

188

Semiflex cable wires airborne microwave systems  

NASA Astrophysics Data System (ADS)

The SiO2 semiflexible cable is made of a solid-copper center conductor, a high-purity low-density silicon dioxide ceramic dielectric, and an outer sheath of stainless-steel tubing over a thin copper inner lining. The high-temperature properties of the ceramic insulation make possible the full annealing of the outer sheath in the final processing step. This annealing step is responsible for the flexibility of the cable and is the main distinction between semiflexible SiO2 cable and semirigid Teflon cable. A simulatied application is presented, and considerations of phase stability and proper use are examined. It is pointed out that the semiflexible SiO2 cable's simple construction can result in a weight savings of 20 to 40 percent and a 25 percent reduction in diameter compared with equivalent-performance flexible Teflon cables.

Winkler, Martin; Gochenour, Tim; Turner, Gary

1991-01-01

189

Condition Monitoring of Cables Task 3 Report: Condition Monitoring Techniques for Electric Cables  

SciTech Connect

For more than 20 years the NRC has sponsored research studying electric cable aging degradation, condition monitoring, and environmental qualification testing practices for electric cables used in nuclear power plants. This report summarizes several of the most effective and commonly used condition monitoring techniques available to detect damage and measure the extent of degradation in electric cable insulation. The technical basis for each technique is summarized, along with its application, trendability of test data, ease of performing the technique, advantages and limitations, and the usefulness of the test results to characterize and assess the condition of electric cables.

Villaran, M.; Lofaro, R.; na

2009-11-30

190

An Approach to the Suppression of Sheath Surge Induced by Switching Surges in a GIS\\/Power Cable Connection System  

Microsoft Academic Search

This paper deals with surges induced in the sheath of a SF6 gas insulated switchgear (GIS)\\/power cable connection system. High frequency switching surges generated from the GIS, in turn, induce sheath surges across insulation sleeves located at GIS\\/power cable connection points and at cable cross-bonded points.

M. Ishikawa; N. Oh-hashi; Y. Ogawa; M. Ikeda; H. Miyamoto; J. Shinagawa

1981-01-01

191

Cable Connector.  

National Technical Information Service (NTIS)

The document describes a connector for joining a fiber optic cable. The connector is constructed with a thin wall tube enclosing strips of a shape memory alloy material. The strips are bent and inserted into the thin wall tube such that an axial cavity is...

J. E. Tydings

1980-01-01

192

Reliability Studies, Construction and Test of a Pilot Cable Installation with Supra-Conductors.  

National Technical Information Service (NTIS)

The basic knowledge of electrical insulation, of current carrying capacity of superconductors, of contraction of papers and of thermal insulation was extended. Different kinds of cable-joints were developed. Voltage tests of a testline were made. The line...

H. Franke

1980-01-01

193

Tools for applying lead tape to flat conductor cabling for chemical stripping  

NASA Technical Reports Server (NTRS)

Two tools facilitate chemical stripping of insulation on flat conductor cabling. A tape pressing tool and a taping fixture apply adhesive lead tape with the proper amount of pressure to protect the remaining insulation from the chemical stripping solution.

Angele, W.

1969-01-01

194

Superconducting Cable  

DOEpatents

In order to provide a flexible oxide superconducting cable which is reduced in AC loss, tape-shaped superconducting wires covered with a stabilizing metal are wound on a flexible former. The superconducting wires are preferably laid on the former at a bending strain of not more than 0.2%. In laying on the former, a number of tape-shaped superconducting wires are laid on a core member in a side-by-side manner, to form a first layer. A prescribed number of tape-shaped superconducting wires are laid on top of the first layer in a side-by-side manner, to form a second layer. The former may be made of a metal, plastic, reinforced plastic, polymer, or a composite and provides flexibility to the superconducting wires and the cable formed therewith.

Hughey, Raburn L. (Franklin, GA); Sinha, Uday K. (Carrollton, GA); Reece, David S. (Carrollton, GA); Muller, Albert C. (Eidson, TN)

2005-07-22

195

Superconducting Cable  

DOEpatents

In order to provide a flexible oxide superconducting cable which is reduced in AC loss, tape-shaped superconducting wires covered with a stabilizing metal are wound on a flexible former. The superconducting wires are preferably laid on the former at a bending strain of not more than 0.2%. In laying on the former, a number of tape-shaped superconducting wires are laid on a core member in a side-by-side manner, to form a first layer. A prescribed number of tape-shaped superconducting wires are laid on top of the first layer in a side-by-side manner, to form a second layer. The former may be made of a metal, plastic, reinforced plastic, polymer, or a composite and provides flexibility to the superconducting wires and the cable formed therewith.

Hughey, Raburn L. (Franklin, GA); Sinha, Uday K. (Carrollton, GA); Reece, David S. (Carrollton, GA); Muller, Albert C. (Eidson, TN)

2005-03-08

196

Hot-blade stripper for polyester insulation on FCC  

NASA Technical Reports Server (NTRS)

Stripper incorporates a blade which is electrically heated to a controlled temperature. Heated blade softens and strips insulation from cable while paper ribbon removes insulation material and keeps blade clean for next operation.

Angele, W.; Chambers, C. M.

1971-01-01

197

Reaction of Silicone-Protected Cables to Humidity Environments.  

National Technical Information Service (NTIS)

Five identical cable assemblies were manufactured. Each had solder-type connectors, two backshell arrangements, four types of wire insulations, and six types of sleeving (three of which were heatshrinkable) at the connectors. The connectors had neoprene r...

S. H. Holtstein

1964-01-01

198

30 CFR 77.602 - Permanent splicing of trailing cables.  

Code of Federal Regulations, 2010 CFR

...When permanent splices in trailing cables are made, they shall be: (a) Mechanically strong with adequate electrical conductivity; (b) Effectively insulated and sealed so as to exclude moisture; and, (c) Vulcanized or...

2009-07-01

199

Thermal overload characteristics of extruded dielectric cables: Final report  

Microsoft Academic Search

This report addresses characteristics of thermoset extruded dielectric power cables in the 15--35 kV class, operated under thermal overload conditions. It presents a methodical study to determine the suitability of extruded type cable for operation at elevated temperatures. The results provide utilities with knowledge on the behavior of thermoset insulated cables at temperatures in the 130 to 175\\/degree\\/C conductor temperature

A. Dima; C. Katz; G. S. Jr. Eager; M. Ezrin; D. Seymour; J. Johnson

1988-01-01

200

High voltage continuous space SF6 gas pressurized cable system  

Microsoft Academic Search

The construction of a continuous-spaces SF6-gas-pressurized high-voltage cable system is reported. The conductor consists of bunched 1.27-cm-diameter aluminium redraw rods. Low-density, dry kraft paper impregnated with pressurized SF6 gas is used for insulation. The enclosure is a nonmetallic, flexible, gas-rated polyethylene conduit. The electrical properties of the insulation approach those of conventional SF6 gas spacer cables. The cost of the

P. F. Pugh

1988-01-01

201

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

202

Flat-conductor cable has rotary and linear flexibility  

NASA Technical Reports Server (NTRS)

Report describes capabilities and limitations of flat-conductor cable /FCC/ relative to flexure in bending, folding, rotating, and extending, it also compares FCC mechanical and endurance characteristics with round-wire cable, and compares qualities of various types of insulation for FCC. Several configurations exemplify FCC flexibility.

Carden, J. R.

1971-01-01

203

30 CFR 18.40 - Cable clamps and grips.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 2010-07-01 false Cable clamps and grips. 18.40 Section 18.40 Mineral...Construction and Design Requirements § 18.40 Cable clamps and grips. Insulated clamps shall be provided for all portable...

2010-07-01

204

30 CFR 18.40 - Cable clamps and grips.  

Code of Federal Regulations, 2010 CFR

...2009-07-01 2009-07-01 false Cable clamps and grips. 18.40 Section 18.40 Mineral...Construction and Design Requirements § 18.40 Cable clamps and grips. Insulated clamps shall be provided for all portable...

2009-07-01

205

Accelerated aging of extruded dielectric power cables. Part 1; Control and monitoring methodology  

Microsoft Academic Search

In accelerated cable life testing of power cables, cable samples are usually subjected to elevated voltages and temperatures in the presence of water in order to promote aging of the insulation and premature failures through the treeing mechanism. Failure to accurately control and monitor these accelerating facts can have adverse effects on test results and can lead to erroneous conclusions.

M. S. Walton; J. T. Smith; W. A. Thue

1992-01-01

206

Accelerated aging of extruded dielectric power cables. I. Control and monitoring methodology  

Microsoft Academic Search

In accelerated cable life testing of power cables, cable samples are usually subjected to elevated voltages and temperatures in the presence of water in order to promote aging of the insulation and premature failures through the treeing mechanism. Failure to accurately control and monitor these accelerating factors can have adverse effects on test results and can lead to erroneous conclusions.

M. D. Walton; W. A. Thue

1991-01-01

207

Design, Development, Fabrication and Testing of High Temperature Flat Conductor Cable (Fcc).  

National Technical Information Service (NTIS)

The results are presented of a development program for a flat, 25-conductor signal cable and a flat, 3-conductor power cable. Flat cables employ conductors made of strips 9or flattened round copper conductors insulated with polyimide films. It is shown th...

W. S. Rigling

1974-01-01

208

Distributed measurement of conductor temperatures in mine trailing cables using fiber-optic technology  

Microsoft Academic Search

Mine trailing power cables operated above safe thermal limits can cause premature insulation failure, increasing electrocution and fire hazards. Previous US Bureau of Mines research showed that, under static test conditions, electrical current levels permitted under present regulations may not limit cable temperatures to less than the 90°C rating of reeled trailing cable. Continuing research under the National Institute for

Thomas H. Dubaniewicz; Peter G. Kovalchik; Lawrence W. Scott; Mark A. Fuller

1998-01-01

209

Life assessment of large power cables in fossil fuel generating stations  

Microsoft Academic Search

As part of fossil generating station upgrades, the major components of the electrical station service system (i.e., the large power cables for the generator leads, transformer secondaries, and motor feeders) are evaluated for increased capacity, continued reliability, and additional service life. This paper discusses the cable aging mechanisms for fossil-power stations, including thermal aging of insulation, insulation voltage stress, corrosion

Petty

1989-01-01

210

Location Feasibility of Degradation in Cable through Fourier Transform Analysis of Broadband Impedance Spectra  

NASA Astrophysics Data System (ADS)

Since electric cables play important roles such as power supply and information transmission, their degradation may cause a serious problem. We have been trying to monitor the degradation of cable insulation by measuring the magnitude and phase angle of impedance as a function of frequency in a very wide frequency range. The cables tested were insulated with flame-retardant ethylene propylene rubber or special heat-resistant polyvinyl chloride. They were damaged partially by peeling off their insulation layers, or aged partially by heat and ?-rays. Impedance and phase angle were measured from a terminal of the cable. The difference in impedance between the damaged and sound cables becomes clear by fast Fourier transform analyses, from which the damaged portion can be located. It can be clearly shown that this method has a potential ability to detect the degradation of cable insulation induced by physical damage, ?-ray irradiation, and thermal aging.

Ohki, Yoshimichi; Hirai, Naoshi

211

Long-term test of the 22.9kV HTS power cable system in LS Cable Ltd  

NASA Astrophysics Data System (ADS)

Since 2001, LS cable Ltd. has been developing the design, manufacturing and evaluation technologies for high temperature superconducting (HTS) power cable system as a member of DAPAS (Dream for Advanced Power system by Applied Superconductivity technology) program in Korea. The 30 m HTS cable system that is rated at 22.9 kV and 1.2 kA giving a rated capacity of 50 MVA had been developed and tested. The cable was designed as a cold dielectric type employing Bi-2223 HTS tapes and polypropylene (PP) laminated paper as the conductor and electrical insulation, respectively. The cable is cooled with sub-cooled liquid nitrogen at temperature from 75 to 77 K. The manufacturing and the installation of the cable system were completed in 2004. Long-term performance test of the cable system has been conducted for six months to verify its electric and mechanical properties in 2005.

Jang, Hyun Man; Lee, Chang Young; Kim, Choon Dong; Kim, Do Hyung; Son Park, In; Ji, Bong Ki; Kim, Dong Wook; Cho, Jeonwook

2006-06-01

212

Electrical Field Modelling at the Cable Joints  

Microsoft Academic Search

There is a large number of parameters that influence to the way of the producing cable joints, and therefore the greatest attenti on is paid on the electrical field density shaping. This is done in order to efficiently red uce electrical field den- sity, especially the tangential electrical field component at the insulator surface. The described problem solving presents very

Nebojsa B. Rai

2007-01-01

213

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

214

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

215

Sound cable crossing brings inexpensive electric power to Long Island  

SciTech Connect

This paper reports that while many electric-utility customers in New York State benefit from inexpensive hydroelectric power from Canada and upstate New York, lack of sufficient transmission connections have prevented this electricity from reaching Long Island. However, a newly constructed underground/underwater link capable of carrying 700-MW now transmits low-cost electricity to the island, saving money for customers. The self-contained fluid-filled cable used for the underwater portion of the project is the largest underwater cable in the world. The use of high-pressure, fluid-filled 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 temperature monitoring and leak detection systems, SF{sub 6} gas-insulated substation, and underwater cable laying and embedment techniques.

Grzan, J. (New York Power Authority (US)); Goyette, R. (Parsons Main, Inc. (US))

1992-01-01

216

Cable Tensiometer for Aircraft  

NASA Technical Reports Server (NTRS)

The invention is a cable tensiometer that can be used on aircraft for real-time, in-flight cable tension measurements. The invention can be used on any aircraft cables with high precision. The invention is extremely light-weight, hangs on the cable being tested and uses a dual bending beam design with a high mill-volt output to determine tension.

Nunnelee, Mark (Inventor)

2008-01-01

217

Process for making RF shielded cable connector assemblies and the products formed thereby  

NASA Technical Reports Server (NTRS)

A process for making RF shielded cable connector assemblies and the resulting structures is described. The process basically consists of potting wires of a shielded cable between the cable shield and a connector housing to fill in, support, regidize, and insulate the individual wires contained in the cable. The formed potting is coated with an electrically conductive material so as to form an entirely encompassing adhering conductive path between the cable shield and the metallic connector housing. A protective jacket is thereby formed over the conductive coating between the cable shield and the connector housing.

Fisher, A.; Clatterbuck, C. H. (inventors)

1973-01-01

218

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

219

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

220

Development of a 100 m, 3-core 114 MVA HTSC cable system  

NASA Astrophysics Data System (ADS)

We have started a project to develop a 100 m 3-core 66 kV/1 kA/114 MVA high temperature superconducting (HTSC) cable system to certify the manufacturing capability and the practicability of an HTSC cable system for use as actual power system equipment. The cable is designed based on the results of a 30 m, 3-core test cable. The cable 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. The three cores are housed in this thermally insulated pipe. The cable has been developed and laid at CRIEPIs test site and long-term tests have been under way since June.

Masuda, Takato; Ashibe, Yuuichi; Watanabe, Michihiko; Suzawa, Chizuru; Ohkura, Kengo; Hirose, Masayuki; Isojima, Shigeki; Honjo, Shoichi; Matsuo, Kimiyoshi; Mimura, Tomoo; Takahashi, Yoshihisa

2002-08-01

221

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

222

Versatile fire barrier systems for telephone cable  

NASA Astrophysics Data System (ADS)

Fire barriers prevent smoke and fire spread along and between cables, through walls and floors, and protect critical conductors and equipment from heat. New flexible intrumescent materials expand up to 10 times when heated, are versatile and easy to install in sealing fire rated floor and wall penetrations. Telephone cables have large insulator/metal ratios and may have slack or oval jacketing, making older limited expansion materials ineffective. Strict design for specific cables and cable densities is obsoleted; reactive foaming chemicals are not needed for an effective seal. Fire expanding hydrated silicate particles are incorporated in a neoprene matrix yielding environmental protection for tough, flexible board, sheet, tape, caulk, putty, and foam rubber products. Penetration kits from these materials have been underwriter tested. Their UL ratings are compared with rubber blocks, foaming resins, and compressed washer devices. Traditional telecraft skills and tools install and adapt the new material to many cable types. Ease, simplicity, speed, and sureness of installation entry, and reentry/reseal are related to the fire hazard window of cable, fiber, or coax additions.

Keith, R. H.; Dahms, D. G.; Licht, R. R.

223

Improved Cable Grip Reduces Wear  

NASA Technical Reports Server (NTRS)

Improved cable grip reduces wear due to sliding friction between cable and gripping surfaces. Drive wheels are grooved with a helical pattern that meshes with the lay of cable, analogous to a worm gear. Cable is gripped between drive wheels and guide rollers, and cable pull is exerted on the grip when drive wheels are slowed by hydraulic clutches. Cable grip may be applicable to cable-operated systems, such as ore trams in mines, overhead cable cars and ski lifts.

Peyran, R. J.

1982-01-01

224

Dc Superconducting Cables.  

National Technical Information Service (NTIS)

Progress in the development of dc superconducting cables suggests these systems will provide an attractive alternate among cable options where long lengths of high-capacity underground transmission lines are required. The general characteristics of dc sup...

W. E. Keller

1979-01-01

225

Serpentine Buoyant Cable Antenna.  

National Technical Information Service (NTIS)

The present invention relates to an improved buoyant cable antenna system. The system includes a buoyant cable transmission line segment and an antenna segment formed from a flexible memory structure comprised of at least one segment of coiled compression...

E. M. Gerhard

2006-01-01

226

Rapid Non-Destructive Condition Assessment of Insulating Materials  

Microsoft Academic Search

The condition of high voltage electrical insulation systems used in power cables, power transformers and generators is influenced by a number of manufacturing and operating variables which affect performance and failure. Although forensic examinations of solid insulation failures are commonly conducted and there are many electrical tests to assess the condition of insulation systems, there has been only a limited

P. J. Baird; H. Herman; G. C. Stevens

2008-01-01

227

Insulation Condition Assessment Through Spectroscopic and Chemometrics Analysis  

Microsoft Academic Search

The condition of high voltage cable, power transformer and generator insulation is affected by a number of manufacturing and operating variables. Although forensic examinations of solid insulation failures are commonly conducted and there are many electrical tests to assess the condition of the insulation system, there has been only a limited effort to investigate and spatially map the changes in

Gary C Stevens; Henryk Herman; Patrick Baird

2007-01-01

228

Cables and fire hazards  

NASA Technical Reports Server (NTRS)

Besides describing the experiments conducted to develop a nonflammable cable, this article discusses several considerations regarding other hazards which might result from cable fires, particularly the toxicity and opacity of the fumes emitted by the burning cable. In addition, this article examines the effects of using the Oxygen Index as a gauge of quality control during manufacture.

Zanelli, C.; Philbrick, S.; Beretta, G.

1986-01-01

229

Cable Library Survey Results.  

ERIC Educational Resources Information Center

This report summarizes a survey of 198 libraries which had been identified as potential cable libraries which assessed: (1) to what extent a national satellite cable library network might already be in technical existence, (2) how many libraries are connected to cooperative cable companies with satellite hardware and excess receiver capacity, and…

Public Service Satellite Consortium, Washington, DC.

230

Risk Mitigation in the Development of a Roebel Cable Based 1 MVA HTS Transformer  

NASA Astrophysics Data System (ADS)

Progress is reported on the development of a 3-phase 1 MVA 11 kV/415 V HTS transformer using Roebel cable for the secondary windings. We describe efforts to address risks associated with short circuits, insulation, and heat transfer. We present modelling results for the response of the windings to a short circuit. Sample strands have been tested to demonstrate that cables immersed in liquid nitrogen can survive short circuits. The primary windings use insulated conductor to withstand computed impulse voltages. Breakdown and partial discharge testing confirms that the production insulation scheme is adequate for our design. Heat transfer results are presented for a sample Roebel cable winding

Glasson, Neil; Staines, Mike; Badcock, Rod; Ward, Logan; Allpress, Nathan; Thakur, Kailash; Pannu, Mohinder

231

Cable Polymer Aging Database, Version 1.0  

SciTech Connect

OAK B139 The database contains electrical-cable jacket and insulation aging data from nine U.S. and international research institutions. The institutions have provided condition monitoring results from numerous accelerated aging test programs for cable materials including neoprene, Hypalon, ethylene propylene rubber, cross-linked polyethylene, and polyvinyl chloride. The condition monitoring techniques include elongation at break, indenter modulus, oxygen induction time, density , swell/gel, and nuclear magnetic resonance in solution.

Thomas Hencey

2002-12-24

232

New MV cable design for wet environments in underground distribution systems  

SciTech Connect

This paper describes the development of new wet design MV power cables, up to 35 kV, using EPDM compound as insulation and longitudinal water tightness. The combination of the cable design and the type of insulation compound allow for reduction of the insulation thickness in such a way, as to have an electrical stress at the conductor of 4 kV/mm which is significantly greater than used in MV distribution cables. Following a methodology established, at the author's company, the reliability of this design, cable and EPDM's formulation, in wet location, without metallic water barriers, was well demonstrated. Mini-installation of model cables in service-like conditions, to estimate the ageing rate, are presented and discussed.

Teixeira, M.D.R. Jr. (Ficap Fios e Cabos Plasticos do Brasil SA, Rio De Janeiro (BR))

1990-04-01

233

30 CFR 56.12013 - Splices and repairs of power cables.  

Code of Federal Regulations, 2010 CFR

...made in power cables, including the ground conductor where provided, shall be: (a) Mechanically strong with electrical conductivity as near as possible to that of the original; (b) Insulated to a degree at least equal to that of the...

2009-07-01

234

30 CFR 57.12013 - Splices and repairs of power cables.  

Code of Federal Regulations, 2010 CFR

...in power cables, including the ground conductor where provided, shall beâ (a) Mechanically strong with electrical conductivity as near as possible to that of the original; (b) Insulated to a degree at least equal to that of the...

2010-07-01

235

30 CFR 57.12013 - Splices and repairs of power cables.  

Code of Federal Regulations, 2010 CFR

...in power cables, including the ground conductor where provided, shall beâ (a) Mechanically strong with electrical conductivity as near as possible to that of the original; (b) Insulated to a degree at least equal to that of the...

2009-07-01

236

Testing of Flat Conductor Cable to Underwriters Laboratory Standards UL719 and UL83.  

National Technical Information Service (NTIS)

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 ...

R. W. Loggins R. H. Herndon

1974-01-01

237

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

238

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

239

Cable Measuring Engine Operation Procedures  

SciTech Connect

The Cable Measuring Engine (CME) is a tool which measures and records the cable dimensions in a nondestructive fashion. It is used in-line with the superconductor cable as it is being made. The CME is intended to be used as a standard method of measuring cable by the various manufacturers involved in the cable process.

Authors, Various

1997-07-11

240

Design, development, fabrication and testing of high temperature Flat Conductor Cable (FCC)  

NASA Technical Reports Server (NTRS)

The results are presented of a development program for a flat, 25-conductor signal cable and a flat, 3-conductor power cable. Flat cables employ conductors made of strips or flattened round copper conductors insulated with polyimide films. It is shown that conductor thickness ranges from 0.003 to 0.010 inch, and begins to soften and loose mechanical strength at temperatures above 200 C.

Rigling, W. S.

1974-01-01

241

Design, development, fabrication and testing of high temperature Flat Conductor Cable (FCC)  

Microsoft Academic Search

The results are presented of a development program for a flat, 25-conductor signal cable and a flat, 3-conductor power cable. Flat cables employ conductors made of strips or flattened round copper conductors insulated with polyimide films. It is shown that conductor thickness ranges from 0.003 to 0.010 inch, and begins to soften and loose mechanical strength at temperatures above 200

W. S. Rigling

1974-01-01

242

Cable suspended windmill  

NASA Technical Reports Server (NTRS)

A windmill is disclosed which includes an airframe having an upwind end and a downwind end. The first rotor is rotatably connected to the airframe, and a generator is supported by the airframe and driven by the rotor. The airframe is supported vertically in an elevated disposition by poles which extend vertically upwardly from the ground and support cables which extend between the vertical poles. Suspension cables suspend the airframe from the support cable.

Farmer, Moses G. (inventor)

1990-01-01

243

Recent Progress in Electrical Insulation Techniques for HTS Power Apparatus  

NASA Astrophysics Data System (ADS)

This paper describes the electrical insulation techniques at cryogenic temperatures, i.e. Cryodielectrics, for HTS power apparatus, e.g. HTS power transmission cables, transformers, fault current limiters and SMES. Breakdown and partial discharge characteristics are discussed for different electrical insulation configurations of LN2, sub-cooled LN2, solid, vacuum and their composite insulation systems. Dynamic and static insulation performances with and without taking account of quench in HTS materials are also introduced.

Hayakawa, Naoki; Kojima, Hiroki; Hanai, Masahiro; Okubo, Hitoshi

244

Line and load friendly drive solutions for long length cable applications in electrical submersible pump applications  

Microsoft Academic Search

Long cable lengths (1,000 ft to 15,000 ft) associated with submersible pump equipment have limited the effectiveness of using modern variable speed drives (VSD) due to reflected wave voltage spikes associated with the drive switching voltage transitions. In the past, drives used external filters, inductors and conditioners to keep from damaging cable and motor insulation. Extra costs associated with this

G. Skibinski; S. Breit

2004-01-01

245

Fatigue Resistance of Large-Size Helically Corrugated Aluminum Sheathed Cables  

Microsoft Academic Search

Large-size corrugated aluminum sheathed cables are finding an increasing use in duct and manhole installations. The complex sheath geometry, relatively large conductors and increased insulation thickness, combined with restricted manholes, would lead to severe sheath strains, increasing the probability of sheath fatigue failure. The results of a program is presented for evaluating fatigue life of large-sized corrugated aluminum sheathed cables.

S. Krishnasamy

1980-01-01

246

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

Microsoft Academic Search

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.

R. W. Loggins; R. H. Herndon

1974-01-01

247

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

248

Etude parametrique des proprietes dielectriques de l'isolation polyethylene de cables miniatures en fonction du vieillissement  

NASA Astrophysics Data System (ADS)

Several problems exist in underground distribution networks. The growth of water trees within the groundwall insulation of extruded cables is one of the problems suspected to be the end of life criteria of a cable. A device developed at the Institut de recherche d'HydroQuebec (IREQ) attempts to assess the health of the cable insulation. It is a time domain spectrometer (TDS). The measurements with this unit are influenced by a multitude of parameters. In addition, the aging by water trees is difficult to reproduce in a laboratory due to the very large test objects. Thus, smaller cables with insulation similar to those of the distribution network are more convenient. These miniature cables make it possible to better control each parameter but also to conduct accelerated aging tests. This research report consists of a parametric study of the dielectric properties of the insulation of miniature cables as a function of aging. The conclusions of this study provide insight into some mechanisms of cable aging and they characterize the influence of test parameters on the results from the TDS measurements. The evolution of dielectric properties as a function of aging was measured in several ways. First, the cables are characterized by measurements of dielectric losses then, the performance of insulation is evaluated with the breakdown voltage of the cable. These voltage breakdowns were plotted using the commonly used Weibull distribution. Finally, the length of water trees was measured to determine if a link exists between the length of the trees and of the voltage breakdown. Three types of laboratory aging tests were preformed on the cables: an aging in water with an alternating voltage applied to the cables, an aging in air with an alternating voltage applied to the cables and finally conditioning in water only. The purpose of this conditioning is to separate the influence of water alone from the process of aging by water trees. Keywords: Insulation, dielectric, water trees, voltage breakdown, Weibull.

Bernier, Simon

249

Evaluation of flammability for cable-like polymers  

NASA Technical Reports Server (NTRS)

A new test method is developed for the flammability of insulated electric cables as well as polymers formed in the cables. The rate of downward flame spread along the polymer surface is measured by a technique in which the flame is stopped at a particular position by winding up the cable at the same speed as the flame spreading rate, with external preheating by an electric furnace having oxidative gas flow. The polymer burns continuously without change of flame condition and the rate is obtained from the winding speed of the cable. A flame spread equation relates the flame spreading rate (V) of the cable-like polymer to O concentration (Yo) and the atmosphere, the preheating temperature, and the pyrolysis temperature for polymer burning. Plotting log V vs. log Yo for experimental results allows evaluation of the flammability of polymers, with discrimination between the effects of O concentration, heating temperature, and specimen shape. Results with various types of PVC electrical cable indicated the validity of the method. Application of the method to the cables in groups showed a flame retardation behavior different from the case of a single cable, in a atmosphere of high O concentration.

Mikado, Tuneo; Akita, Kazuo

1988-01-01

250

Cable TV Station Authorization Report.  

National Technical Information Service (NTIS)

A list of cable television stations authorized to broadcast a television station programs identified by call letters and location. This includes the community name, the cable television operator's legal name and the number of subscribers for each cable st...

1981-01-01

251

A measurement setup for the detection of shield inhomogeneities of built-in multiconductor cables based on a differential sniffer method  

Microsoft Academic Search

In modern aircraft, often shielded multiconductor cables are used in order to realize a secure data transmission between electrical devices. During long life operation, these cables sustain damages from different sources. Arcing, corrosion and mechanical deformation, respectively, feature severe conditions for aircraft often leading to relatively small damage on the cable insulation and the shield. Considering EMI aspects, an inhomogeneity

Christoph Weber; J. L. ter Haseborg

2002-01-01

252

Cable: An Overview.  

ERIC Educational Resources Information Center

Cable television communications are an advance in technology which promises profound changes in the way people live and communicate with each other. However, to take advantage of the opportunities that the cable provides requires thoughtful evaluation and careful policy making. This booklet is designed to provide an introduction to the potential…

Cable Television Information Center, Washington, DC.

253

Semiconductor Bridge Cable Tests.  

National Technical Information Service (NTIS)

The semiconductor bridge (SCB) is an electroexplosive device used to initiate detonators. A C cable is commonly used to connect the SCB to a firing set (FS). A series of tests were performed to identify smaller, lighter cables for firing single and multip...

T. L. King

2002-01-01

254

Semiconductor Bridge Cable Test  

Microsoft Academic Search

The semiconductor bridge (SCB) is an electroexplosive device used to initiate detonators. A C cable is commonly used to connect the SCB to a firing set. A series of tests were performed to identify smaller, lighter cables for firing single and multiple SCBs. This report provides a description of these tests and their results. It was demonstrated that lower threshold

TONY L

2002-01-01

255

Correction coil cable  

Microsoft Academic Search

The present invention relates generally to the field of the manufacture of electrical coil windings, and more particularly to a unique cable assembly for use in winding coils having small wires and a large number of winding turns. The predominant current usage of the correction coil cable of the present invention is as the winding wire for correction coils in

Sou-Tien

1991-01-01

256

Correction coil cable  

Microsoft Academic Search

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

Sou-Tien

1994-01-01

257

Correction coil cable  

Microsoft Academic Search

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

1994-01-01

258

Knot at the Cable  

NSDL National Science Digital Library

Knot at the Cable ties together non-governmental organizations, public libraries and the Internet. Located in a public library (branch of Helsinki City Library) at the Cable Factory cultural centre in Helsinki, it offers access to WorldWideWeb and telnet access for library visitors and acts as a WWW publishing outlet.

259

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.

260

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 easil

Borden, A.R.

1984-03-08

261

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

262

Improvement in fire safety features of electrical conductors and cables  

Microsoft Academic Search

There is ever increasing awareness and need for wire and cable materials that exhibit improved fire safety. The traditional characteristics of insulation resistance, water resistance, oil resistance, sunlight resistance, abrasion resistance, crush resistance, deformation resistance and fire resistance are not sufficient for all occasions. The improvements not only involve delayed ignition, limited propagation and lower smoke and toxic gas emissions

L. B. McClung; S. Ramachandran

1995-01-01

263

Improvement in fire safety features of electrical conductors and cables  

Microsoft Academic Search

There is ever increasing awareness and need for wire and cable materials that exhibit improved fire safety. The traditional characteristics of insulation resistance, water resistance, oil resistance, sunlight resistance, abrasion resistance, crush resistance, deformation resistance and fire resistance are not sufficient for all occasions. The improvements not only involve delayed ignition, limited propagation and lower smoke and toxic gas emissions

L. B. McClung; S. Ramachandran

1994-01-01

264

Improvement in fire safety features of electrical conductors and cables  

Microsoft Academic Search

There is ever increasing awareness and need for wire and cable materials that exhibit improved fire safety. The traditional characteristics of insulation resistance, water resistance, oil resistance, sunlight resistance, abrasion resistance, crush resistance, deformation resistance, and fire resistance are not sufficient for all occasions. The improvements not only involve delayed ignition, limited propagation and lower smoke and toxic gas emissions

L. B. McClung; S. Ramachandran

1993-01-01

265

Flat conductor cable connector with contact separation seal  

NASA Technical Reports Server (NTRS)

Cable connector is developed in which each pair of contact elements is isolated by plastic cells and the mating interface is sealed by an elastic gasket. So insulated, the connector may be operated under high vacuum conditions at voltages up to 600 V ac without electrical leakage or intercontact ionization.

Angele, W.

1970-01-01

266

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

267

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

268

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

269

Cable end seal for oil-filled cables  

US Patent & Trademark Office Database

A cable end seal for a multiple-conductor oil filled cable includes an inner sealing boot adjacent the cable and filled with an oil restraint material for the temporary restraint of cable oil and an outer boot and cylindrical mold filled with hardenable material for the permanent containment of the cable oil. The inner boot and oil restraint material prevents contact between the oil and the material at least until the material has hardened.

1998-02-03

270

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

271

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.

272

Partial discharge diagnostics and electrical equipment insulation condition assessment  

Microsoft Academic Search

Partial discharge (PD) measurement has long been used as a test to evaluate different insulation system designs, and as a quality control test for new equipment. However, in the past 20 years, PD measurement has been widely applied to diagnose the condition of the electrical insulation in operating apparatus such as switchgear, transformers, cables, as well as motor and generator

G. C. Stone

2005-01-01

273

LOCA testing of damaged cables  

Microsoft Academic Search

Experiments were conducted to assess the effects of dielectric withstand voltage 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 cables. During aging and LOCA testing, Okonite ethylene propylene rubber cables with a

R. A. Vigil; M. J. Jacobus; C. F. Nelson

1992-01-01

274

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.

2008-05-01

275

Trawl Cable Corrosion.  

National Technical Information Service (NTIS)

The nature of trawl cable corrosion on Oregon coastal trawlers was analyzed to evaluate the feasibility of corrosion control. The analysis leads to a detailed discussion of possible future experiments designed to accurately determine the amount and type o...

R. D. Malloch E. R. Kolbe

1978-01-01

276

Cable Strumming Suppression.  

National Technical Information Service (NTIS)

This report presents a consolidation of existing data on various devices used to suppress vortex-induced motions of cables and circular cylinders in the ocean. The types of devices discussed herein include 'fringe,' 'hair,' and ribbon flexible fairings an...

B. E. Hafen D. J. Meggitt

1977-01-01

277

Cable Stayed Timber Bridges.  

National Technical Information Service (NTIS)

A growing market segment open to timber bridges is pedestrian bridges crossing highways, railways and watercourses. These bridges are often calling for a long span and large vertical clearance under the bridge. Suspended and cable stayed bridges are attra...

A. Pousette

2001-01-01

278

Reliable Flat Cable Connector.  

National Technical Information Service (NTIS)

The report includes test specimens for three types of conductor-contact interfaces which were ordered and assembled with test cables. The automatic data acquisition equipment has been completed and test paper tapes perforated, and a trial run through the ...

R. L. Huffman

1968-01-01

279

Semiconductor Bridge Cable Test  

SciTech Connect

The semiconductor bridge (SCB) is an electroexplosive device used to initiate detonators. A C cable is commonly used to connect the SCB to a firing set. A series of tests were performed to identify smaller, lighter cables for firing single and multiple SCBs. This report provides a description of these tests and their results. It was demonstrated that lower threshold voltages and faster firing times can be achieved by increasing the wire size, which reduces ohmic losses. The RF 100 appears to be a reasonable substitute for C cable when firing single SCBs. This would reduce the cable volume by 68% and the weight by 67% while increasing the threshold voltage by only 22%. In general, RG 58 outperforms twisted pair when firing multiple SCBs in parallel. The RG 58's superior performance is attributed to its larger conductor size.

KING, TONY L.

2002-01-01

280

Flat Conductor Cable Applications.  

National Technical Information Service (NTIS)

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 i...

W. Angele

1972-01-01

281

Flat conductor cable survey  

NASA Technical Reports Server (NTRS)

Design handbook contains data and illustrations concerned with commercial and Government flat-conductor-cable connecting and terminating hardware. Material was obtained from a NASA-sponsored industry-wide survey of approximately 150 companies and Government agencies.

Swanson, C. R.; Walker, G. L.

1973-01-01

282

Multiport Cable Choke.  

National Technical Information Service (NTIS)

The patent concerns a unitary broadband high impedance isolation section for a plurality of closely spaced antennas, as well as other electrical apparatus, wherein the respective separate coaxial cables feeding the antennas and the shielded multi conducto...

D. V. Campbell J. J. Arnold

1979-01-01

283

Superconducting cable joint resistance  

SciTech Connect

This paper reports on results of a parametric study of the 4.2 K resistance of lap joints between two 27-strand cables of multifilamentary Nb{sub 3}Sn wire. All joints were between ribbon terminations made rolling copper-encapsulated cable ends flat. Resistances as functions of current were inferred from current decay time constants of cable-in-conduit conductor loops connected by the joints. The resistances of twenty three samples were measured (range of 0.2 to 3 n{Omega}). It was found that lap joint resistance was a function of current. The influences of solder versus no solder, solder thickness, indium versus tin-lead, ribbon surface oxidation, solder flux, cable twist pitch, wire chrome plating, clamping pressure during heat treatment, ribbon aspect ratio, and joint length are reported.

Herbelot, O.; Steeves, M.M.; Hoening, M.O. (Massachusetts Inst. of Tech., Cambridge, MA (United States). Plasma Fusion Center)

1991-03-01

284

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

285

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

286

Marine seismic cable connector  

SciTech Connect

A hermaphroditic connector-half for coupling together adjacent streamer-cable sections consisting of an outer plastic shell that can be slid over a stress plate that carries a plurality of multicontact connector plugs. For maintenance purposes, the outer shell can be removed so that free access may be had to the contacts of the connector plugs and to the multiple conductors in the streamer cable.

Williams, S. D.

1985-07-02

287

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

288

Magnet cable manufacturing  

SciTech Connect

The superconducting magnets used in the construction of particle accelerators are mostly built from flat, multistrand cables with rectangular or keystoned cross sections. The superconducting strands are mostly circular but a design of a cable made of preflattened wires was proposed a few years ago under the name of Berkeley flat; such cable shows some interesting characteristics. Another design consists of a few smaller precabled wires (e.g. 6 around 1). This configuration allows smaller filaments and a better transposition of the current elements. The Superconducting Super Collider project involves the largest amount of superconducting cable ever envisaged for a single machine. Furthermore, the design calls for exceptional accuracy and improved characteristics of the cable. A part of the SSC research and development program is focused on these important questions. In this paper we emphasize the difference between the conventional cabling and wires with superconducting. A new concept for the tooling will be introduced as well as the necessary characteristics of a specialized cabler. 5 figs.

Royet, J.

1985-07-01

289

Cable interconnections for solar cell modules  

SciTech Connect

This patent describes a photovoltaic solar cell device having a rear wall and a conductive terminal strip protruding from the rear wall and having a hole therein, a member made of an insulating material secured to the rear wall, the member having an aperture and being positioned so that the hole in the terminal strip extends across the aperture, and a nut capturing the strip to the member so as to provide an electrical connection with the strip, the nut having a threaded hole accessible through the aperture to receive a threaded hole accessible through the aperture to receive a threaded fastener for securing the strip to an electrical cable.

Tronstrom, E.; Norbedo, A.J.

1992-05-05

290

Cryogenic insulation  

Microsoft Academic Search

Midwesco Enterprise, Inc, has developed an improved insulator for use with LNG pipelines that practically satisfies the theoretical promise of a satisfactory insulator, is relatively inexpensive, does not require periodic reevacuation (as does vacuum-type insulation), and offers a coefficient of thermal expension sufficiently low to prevent cracking at the cold face next to the line (unlike polyurethane foam). This new

Hallwood

1974-01-01

291

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

292

Ground Investigation of Sustained Arc Phenomena in Power Cables on ADEOS-II Satellite  

NASA Astrophysics Data System (ADS)

We investigated the power loss due to the sustained arc between primary satellite power cables. If the multi layer insulation (MLI) film on a satellite is electrically floating, energetic electrons in space will charge this film. We carried out an internal pressure measurement of MLI and ESD test on cable with cracks and wrapped with this film. When the negative voltage on the MLI exceeded -1kV, a trigger arc discharge occurred between the MLI and the cables. Subsequently, a secondary arc discharge occurred between the cables themselves. In the specific condition, this secondary arc caused sustained arc which burned out the cables. The heat caused by arc tracking between the hot and return cables made them burn out. If this phenomenon had occurred in space, the satellite would have suffered great damage.

Hosoda, Satoshi; Kim, Jeongho; Cho, Mengu; Toyoda, Kazuhiro; Kawakita, Shirou; Kusawake, Masahiro; Takahashi, Masato; Maejima, Hironori

293

Investigation on the suitability of PSCAD\\/EMTDC models to study energisation transients of 132 kV underground cables  

Microsoft Academic Search

Behaviour of energisation transients of high voltage (HV) underground cable system can be established through carefully crafted simulation studies. This information is useful for design engineers to ensure that protection and insulation co-ordination are able to meet design criteria. This paper presents an assessment of the validity and applicability of existing cable models in PSCAD\\/EMTDC to study energisation transients of

M. Z. Daud; P. Ciufo; S. Perera

2008-01-01

294

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

295

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

296

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

297

34. BARGE LOADING PIER, DETAIL SHOWING CABLE CAR TRACKS, CABLE ...  

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

34. BARGE LOADING PIER, DETAIL SHOWING CABLE CAR TRACKS, CABLE CARS AND WALKWAYS. LOOKING TOWARD THE EAST END FROM THE WEST END - Pennsylvania Railroad, Canton Coal Pier, Clinton Street at Keith Avenue (Canton area), Baltimore, Independent City, MD

298

Report on full-scale horizontal cable tray fire tests, FY 1988  

SciTech Connect

In recent years, there has been much discussion throughout industry and various governmental and fire protection agencies relative to the flammability and fire propagation characteristics of electrical cables in open cable trays. It has been acknowledged that under actual fire conditions, in the presence of other combustibles, electrical cable insulation can contribute to combustible fire loading and toxicity of smoke generation. Considerable research has been conducted on vertical cable tray fire propagation, mostly under small scale laboratory conditions. In July 1987, the Fermi National Accelerator Laboratory initiated a program of full scale, horizontal cable tray fire tests, in the absence of other building combustible loading, to determine the flammability and rate of horizontal fire propagation in cable tray configurations and cable mixes typical of those existing in underground tunnel enclosures and support buildings at the Laboratory. The series of tests addressed the effects of ventilation rates and cable tray fill, fire fighting techniques, and effectiveness and value of automatic sprinklers, smoke detection and cable coating fire barriers in detecting, controlling or extinguishing a cable tray fire. This report includes a description of the series of fire tests completed in June 1988, as well as conclusions reached from the test results.

Riches, W.M.

1988-09-01

299

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

300

Transatlantic Cable Communications  

NSDL National Science Digital Library

This new addition to Canada's digital collections chronicles the role played in worldwide communications by the Nova Scotian town of Canso and the nearby community of Hazel Hill as home to one end of the transatlantic cable linking Britain and North America. The site explores the history of telegraphy, the cable's social and economic impact on the community, and some famous messages sent and received. It also examines the science of telegraphy, the construction of the cable, and some key inventions. In addition, users will find here some photos, several videos, a glossary, and a FAQ. While by no means the most extensive online history exhibit, this site should appeal to anyone interested in the history of communications or history of science.

301

An Internal Coaxial Cable Electrical Connector For Use In Downhole Tools  

DOEpatents

A seal for a coaxial cable electrical connector more specifically an internal seal for a 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 transformer. 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 core of the coaxial cable. The electrically insulating material also doubles as a seal to safegaurd against penetration of fluid, thus protecting against shorting out of the electrical connection. The seal is a multi-component seal, which is pre-compressed to a desired pressure rating. The coaxial cable and inductive transformer are disposed within downhole tools to transmit electrical signals between downhole tools within a drill string. The internal coaxial cable connector and its attendant seal can be used in a plurality of downhole tools, such as sections of pipe in a drill string, drill collars, heavy weight drill pipe, and jars.

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)

2005-09-20

302

FCC Policy on Cable Ownership.  

National Technical Information Service (NTIS)

This report is the result of the Commission's directive in October 1980, that the staff study FCC cable ownership policies, particularly those dealing with cross ownership of cable systems by telephone companies, broadcasters and TV networks; multiple own...

K. Gordon J. D. Levy R. S. Preece

1981-01-01

303

Active Negative Sequence Cable Monitor.  

National Technical Information Service (NTIS)

The patent application relates generally to apparatus for detecting a broken ground conductor in a polyphase cable and, more particularly, to apparatus responsive to sequence components induced in a plurality of ground conductors in a polyphase cable.

Gadwal

1975-01-01

304

Electrical-cable design guide  

NASA Technical Reports Server (NTRS)

Formulas and tables are provided to aid designers in determining electrical cable jacket sizes, number of wires per lay pattern, filler material requirements, jacket wall thickness, and overall cable diameters.

Phelps, G. A.

1976-01-01

305

Pyrotechnic-actuated cable release  

NASA Technical Reports Server (NTRS)

Remote, unattended means has been designed and reduced to practice that retains and then releases an attached load by means of a restrained cable. The cable is released by an electrical impulse on signal.

Hanson, R. W.

1968-01-01

306

Coaxial cable cutter  

DOEpatents

A cutting device is provided which is useful in trimming the jackets from semi-rigid coaxial cables and wire having a cutting bit and support attached to movable jaws. A thumbpiece is provided to actuate the opening of the jaws for receiving the cable to be trimmed, and a spring member is provided to actuate the closing of the jaws when thumbpiece is released. The cutting device utilizes one moving part during the cutting operation by using a rolling cut action. The nature of the jaws allows the cutting device to work in space having clearances less than 0.160 inches.

Hall, Leslie C. (Grandview, MO); Hedges, Robert S. (Belton, MO)

1990-04-10

307

Wiring and Cabling  

NSDL National Science Digital Library

Created by Work-Ready Electronics, a project of the Advanced Technological Education program, this module introduces students to wiring and cabling principles, including transmission lines, computer network and wireless systems, and troubleshooting. The Knowledge Probes allow students to answer open-ended questions covering the content of the module, and the Learning Resources present activities, laboratories, and games to further solidify the material. The Notebook function allows visitors to take notes and review them at any time. This is an excellent resource for vocational electronics educators as a ready-made classroom introduction to wiring and cabling.

2008-12-08

308

Flow about yawed, stranded cables  

Microsoft Academic Search

The development of a steady lift force on a stranded cable, which is yawed with respect to a flow, is a unique characteristic of a cable when compared to a circular cylinder. Comparisons of lift and normal drag coefficients and wake characteristics were made between stranded cable models and the cylinder. These were based upon surface pressure and hot-wire measurements

J. Nebres; S. Batill; R. Nelson

1993-01-01

309

Cable Measuring Engine Operation Procedures.  

National Technical Information Service (NTIS)

The Cable Measuring Engine (CME) is a tool which measures and records the cable dimensions in a nondestructive fashion. It is used in-line with the superconductor cable as it is being made. The CME is intended to be used as a standard method of measuring ...

1997-01-01

310

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

311

Long length HTS cable with integrated FCL property  

NASA Astrophysics Data System (ADS)

The past years have shown the growth of bottlenecks in electric power grids, among other reasons caused by the increasing demand of energy in the form of electricity and by the large-scaled integration of renewable sources. As solving of these challenges by means of traditional solutions appears to be more and more problematic, the need for new technology solutions has become apparent. The HTS cable technology demonstrates a great potential in solving of grid congestion issues. In addition to their large power transport capacity and low losses, modern-generation HTS cables also have an integrated fault-current limiting (FCL) property. Applications of such cables in power grids will help to solve fault-current issues when connecting new generators, and dispersed and large-scale renewable sources. As HTS cables, used in current projects, are limited to hundreds of meters in length, they have still not been used for energy transport over long distances. The Dutch DSO Alliander, together with Ultera, is working on the development of a 6 km FCL HTS cable for installation in the Alliander's HV grid. In order to get the low-loss benefits of the HTS technology, a cooling system with a high efficiency is needed. The FCL HTS cable will be cooled by one cooling station at each end of the cable, using a liquid nitrogen coolant. Alliander and Ultera have established and work to achieve technical performance targets believed to be required to realise a 6 km long, 50 kV retrofit system with a power rating of 250 MVA with cooling stations only at the two ends of the cable system. These targets aim to reduce the superconductor's AC loss at a nominal current, reduce the heat leak of the thermally insulating envelope, increase the voltage rating and reduce the friction coefficient of the coolant flow.

Melnik, Irina; Geschiere, Alex; Willén, Dag; Lentge, Heidi

2010-06-01

312

Enhancing cable television pictures  

Microsoft Academic Search

Real time image enhancement of video pictures is discussed. Video pictures such as cable TV pictures are by nature noisy. The problem is how to enhance the picture's appearance without amplifying the noise. Two basic restrictions are that the pictures should be processed at video rate and the cost of the system has to be very low. The authors' scheme

Pingnan Shi; Julong Du; R. K. Ward

1995-01-01

313

Reliable Flat Cable Connector.  

National Technical Information Service (NTIS)

The test program and statistical data analysis of Phase One is complete and results are reported. The investigation of four types of cable conductor-connector contact interfaces in Phase One as completed, based on tests, data analysis and related Martin M...

E. M. French

1970-01-01

314

Corrugated Metallic Cable Sheath  

Microsoft Academic Search

The helically corrugated, impervious, steel sheath is formed around the cable core, welded and corrugated in a continuous operation. This manufacturing method eliminates the thermal problems of the extrusion process, the length restrictions of the sinking or draw-down system, and also increases the pliability and the radial strength of the sheath. The sheath is an impervious barrier to gases and

K. Andresen; F. Dias; N. D. Kenney

1958-01-01

315

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

316

Educational Telecommunications. Cable Conference.  

ERIC Educational Resources Information Center

The Michigan Department of Education sponsored a conference which brought educational administrators and cable television (CATV) entrepreneurs together for a common exploration of their respective concerns in order that they might develop a working relationship leading to the effective utilization of CATV by educators. Major topics dealt with: 1)…

Michigan State Board of Education, Lansing.

317

Fiber Optic Cable Connector.  

National Technical Information Service (NTIS)

A fiber optic cable connector is described for coupling together a pair of optical fibers having a pair of fixtures, each of the fixtures securing therein a respective optical fiber and having a magnification lens optically aligned with the end of the opt...

J. E. Ludman

1982-01-01

318

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

319

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

320

Improved Dielectric Guy Cable.  

National Technical Information Service (NTIS)

The report describes the evolution, theory, development, manufacture, and test of a new type of high strength, dielectric guy cable for use with Loran C and D type towers and other similar systems requiring reliable guying and catenaries. Designated as 'C...

A. A. Cadwallader

1973-01-01

321

SGEMP-induced transfer admittance coupling in cable bundles  

NASA Astrophysics Data System (ADS)

The coupling of energy to the inner wires of an electrical cable bundle exposed to nuclear X-rays which involves the transfer admittance of the inner bundle shields is analyzed. In this coupling mode, the electric field induced by SGEMP between the outer and inner shields couples to the wires via small apertures in the inner shields. The transfer admittance-coupled response is calculated for a generic cable bundle by utilizing an equivalent circuit model, and the results are compared with the direct injection response. The sensitivity of the response to significant cable parameters is examined, and the limitations of the model are noted. It is found that an insulating tape wrap adjacent to the outer shield, usually present as an aid in fabrication, can reduce the response by about an order of magnitude.

Nielsen, L. C.; Crain, C. R.

1982-12-01

322

SGEMP-induced transfer admittance coupling in cable bundles  

SciTech Connect

One of the ways energy can couple to the inner wires of an electrical cable bundle exposed to nuclear x-rays involves the transfer admittance of the inner bundle shields; the authors present an analysis of this coupling mode, in which the electric field induced by SGEMP between the outer and inner shields couples to the wires via small apertures in the inner shields. Using an equivalent circuit model, the transfer admittance-coupled response is calculated for a generic cable bundle, and compared with the direct injection response. Sensitivity of the response to significant cable parameters is investigated, and limitations of the model are discussed. It is shown that an insulating tape wrap adjacent to the outer shield, often present as a fabrication aid, reduces the response by about an order of magnitude.

Nielsen, L.C.; Crain, C.R.

1982-12-01

323

Heat Transfer Study for HTS Power Transfer Cables  

NASA Technical Reports Server (NTRS)

Thermal losses are a key factor in the successful application of high temperature superconducting (HTS) power cables. Existing concepts and prototypes rely on the use of multilayer insulation (MLI) systems that are subject to large variations in actual performance. The small space available for the thermal insulation materials makes the application even more difficult because of bending considerations, mechanical loading, and the arrangement between the inner and outer piping. Each of these mechanical variables affects the heat leak rate. These factors of bending and spacing are examined in this study. Furthermore, a maintenance-free insulation system (high vacuum level for 20 years or longer) is a practical requirement. A thermal insulation system simulating a section of a flexible FITS power cable was constructed for test and evaluation on a research cryostat. This paper gives experimental data for the comparison of ideal MLI, MLI on rigid piping, and MLI between flexible piping. A section of insulated flexible piping was tested under cryogenic vacuum conditions including simulated bending and spacers.

Augustynowicz, S.; Fesmire, J.

2002-01-01

324

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

325

Physical properties of single water trees extracted from field aged cables  

Microsoft Academic Search

The long-term degradation phenomenon called water treeing is still of concern in polymeric insulated medium voltage cables. To get a better understanding of this ageing effect we investigated the physical properties of single water trees extracted from field aged cables. We will present measurements of the permittivity, the water content and the I-V-characteristics of single vented trees. The real part

F. Stucki; J. Rhyner

1994-01-01

326

A new concept for test equipment for testing large HV and UHV cables on-site  

Microsoft Academic Search

Summary  The number of projects involving long and extra long HV and UHV AC cables as well as HVDC cable connections can be observed\\u000a to increase (Cao et al., 2008; Kabouris et al., 2006). At the same time, operating voltage levels are increasing, accentuating the need for more powerful on-site test systems\\u000a needed to prove the integrity of the insulation before

P. Mohaupt; A. Bergman

2010-01-01

327

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

328

Tests of insulation systems for Nb3Sn wind and react coils  

Microsoft Academic Search

Tests were performed to assess the viability of several cable insulation systems for use in NbSn accelerator magnets. Insulated stacks of cables were subjected to reaction cycles commonly used for NbSn coils. After reaction and epoxy impregnation, current leakage between turns was measured at pressures up to 180 MPa and turn-to-turn potentials up to 500V. Systems consisting of S-2 glass,

R. Bossert; G Ambrosio; N. Andreev; G. Whitson; A. Zlobin

2007-01-01

329

Tests of Insulation Systems for Nb3SN Wind and React Coils  

Microsoft Academic Search

Tests were performed to assess the viability of several cable insulation systems for use in Nb3Sn accelerator magnets. Insulated stacks of cables were subjected to reaction cycles commonly used for Nb3Sn coils. After reaction and epoxy impregnation, current leakage between turns was measured at pressures up to 180 MPa and turn-to-turn potentials up to 500 V. Systems consisting of S-2

R. Bossert; G. Ambrosio; N. Andreev; G. Whitson; A. Zlobin

2008-01-01

330

Performance of a Technical and Economical Feasibility Study of an HVDC Compressed Gas Insulated Transmission Line.  

National Technical Information Service (NTIS)

Progress in evaluating the technical feasibility of SF sub 6 -insulated cables and circuit breakers for HVDC systems is reported. During this reporting period a new test setup was completed. An assembly jig was designed and fabricated. Model cable up to 2...

R. L. LaBarge

1980-01-01

331

Development of Inspection Robots for Bridge Cables  

PubMed Central

This paper presents the bridge cable inspection robot developed in Korea. Two types of the cable inspection robots were developed for cable-suspension bridges and cable-stayed bridge. The design of the robot system and performance of the NDT techniques associated with the cable inspection robot are discussed. A review on recent advances in emerging robot-based inspection technologies for bridge cables and current bridge cable inspection methods is also presented.

Kim, Se-Hoon; Lee, Jong-Jae

2013-01-01

332

Development of inspection robots for bridge cables.  

PubMed

This paper presents the bridge cable inspection robot developed in Korea. Two types of the cable inspection robots were developed for cable-suspension bridges and cable-stayed bridge. The design of the robot system and performance of the NDT techniques associated with the cable inspection robot are discussed. A review on recent advances in emerging robot-based inspection technologies for bridge cables and current bridge cable inspection methods is also presented. PMID:24459453

Yun, Hae-Bum; Kim, Se-Hoon; Wu, Liuliu; Lee, Jong-Jae

2013-01-01

333

New Structure of Optical Fiber Protection Cable Using Helical Composite Spring  

NASA Astrophysics Data System (ADS)

A new type of cable is introduced for protecting optical fiber from mechanical bending or abrupt temperature changes. It shows superior ability to protect fiber from severe bending and lowers the thermal sensitivity compared with conventional optical fiber cable. It can be used as a protection sleeve or cable in special regions. The proposed device consists of a helical composite spring, a thermal insulator (i.e., polyurethane foam) and a heat-shrinkable tube which coats the outside of the spring. These components can be acquired for a moderate price and manufactured by simple processes.

Chung, Seunghwan; Yoon, Youngki; Lee, Woo?Il; Lee, Byoungho

2006-07-01

334

The development of a Roebel cable based 1 MVA HTS transformer  

NASA Astrophysics Data System (ADS)

This paper describes recent experimental results in a continuing program to develop a 1 MVA demonstration transformer that employs HTS Roebel cable for the high current windings. The electrical design parameters of the transformer are presented, including the configuration of the specially developed Roebel cable. This paper discusses estimation of the cable Ic from measured Ic(B) data for samples of the strands, AC loss minimization using flux diverters, proving the suitability of the polyimide insulation scheme to withstand the effects of a high voltage impulse and modelling and experimental verification of the fault current limiting behaviour expected from the HTS conductor.

Staines, Michael; Glasson, Neil; Pannu, Mohinder; Thakur, Kailash P.; Badcock, Rod; Allpress, Nathan; D'Souza, Premal; Talantsev, Evgueni

2012-01-01

335

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

336

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

337

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

338

Method to improve superconductor cable  

DOEpatents

A method is disclosed of making a stranded superconductor cable having improved flexing and bending characteristics. In such method, a plurality of superconductor strands are helically wound around a cylindrical portion of a mandrel which tapers along a transitional portion to a flat end portion. The helically wound strands form a multistrand hollow cable which is partially flattened by pressure rollers as the cable travels along the transitional portion. The partially flattened cable is impacted with repeated hammer blows as the hollow cable travels along the flat end portion. The hammer blows flatten both the internal and the external surfaces of the strands. The cable is fully flattened and compacted by two sets of pressure rollers which engage the flat sides and the edges of the cable after it has traveled away from the flat end portion of the mandrel. The flattened internal surfaces slide easily over one another when the cable is flexed or bent so that there is very little possibility that the cable will be damaged by the necessary flexing and bending required to wind the cable into magnet coils.

Borden, A.R.

1984-03-08

339

Hanging Windmills From Cables  

NASA Technical Reports Server (NTRS)

Relatively inexpensive structure enables raising and lowering of windmills. Windmills supported, according to new concept, by hanging from cables. Possible to raise and lower windmills easily for maintenance and to lower them to avoid excessive windspeeds. Airframe consists of fuselage and empennage. Windmill turns shaft driving electrical generator. Device aerodynamically stable so it will rotate in yaw to maintain windmill in downwind position as wind direction changes.

Farmer, Moses G.

1987-01-01

340

Cable modem traffic jam  

Microsoft Academic Search

Broadband access to the Internet by cable modem promises users lightning-fast download speeds and an always-on connection. Recent converts to broadband from dial-up technology are thrilled with complex Web screens that download rapidly. Here, the author describes how tie-ups that slow broadband Internet access to a crawl are a reality-but solutions are also near at hand

W. S. Ciciora

2001-01-01

341

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

342

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

343

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

344

Calorimetric measurements of the effect of nickel and stabrite coatings and resistive cores on AC loss in accelerator cables under fixed pressure  

Microsoft Academic Search

Calorimetric measurements of AC loss on long three- and four-layer stacks of Rutherford cable have been made with the applied field both normal to (face-on, FO, orientation) and parallel to the plane of the cable. Cables studied had bare-Cu, Ni-plated, and stabrite-coated strands; the latter were provided with metallic or insulating interlayers (cores) of, respectively, unalloyed Ti, stainless steel, and

M. D. Sumption; E. W. Collings; R. M. Scanlan

1997-01-01

345

Development of a generator stator insulation system  

NASA Astrophysics Data System (ADS)

The insulation of stator windings in generators is an old technology, dating to the turn of the century with kraft paper insulated, oil filled cables. Recently, two new classes of machines requiring much more advanced techniques of insulation have emerged. These generators are designed for relatively short duty in situations where light weight and small size are crucial to the overall mission, and mobility is a must. One class of machines uses superconducting windings to achieve small size. The other class consists of conventional generators designed to have extremely high power densities and specific powers. These machines represent a considerable engineering achievement, being significantly smaller than any previous generator. In one of these generators, manufactured by Bendix, substantial problems have been encountered in the stator winding insulation, because of the high fields dictated by the extremely high power density. This report presents the Hughes Aircraft Company approach and solution to these problems.

Buritz, R. S.

1983-04-01

346

Cable Bundle Wire Derating  

NASA Technical Reports Server (NTRS)

The allowable operating currents of electrical wiring when used in the space vacuum environment is predominantly determined by the maximum operating temperature of the wire insulation. For Kapton insulated wire this value is 200 C. Guidelines provided in the Goddard Space Flight Center (GSFC) Preferred Parts List (PPL) limit the operating current of wire within vacuum to ensure the maximum insulation temperature is not exceeded. For 20 AWG wire, these operating parameters are: 3.7 amps per wire, bundle of 15 or more wires, 70 C environment, and vacuum of 10(exp -5) torr or less. To determine the behavior and temperature of electrical wire at different operating conditions, a thermal vacuum test was performed on a representative electrical harness of the Hubble Space Telescope (HST) power distribution system. This paper describes the test and the results.

Lundquist, Ray A.; Leidecker, Henning

1998-01-01

347

Cable Bundle Wire Derating  

NASA Technical Reports Server (NTRS)

The allowable operating currents of electrical wiring when used in the space vacuum environment is predominantly determined by the maximum operating temperature of the wire insulation. For Kapton insulated wire this value is 200 C. Guidelines provided in the Goddard Space Flight Center (GSFC) Preferred Parts List (PPL) limit the operating current of wire within vacuum to ensure the maximum insulation temperature is not exceeded. For 20 AWG wire, these operating parameters are: (1) 3.7 amps per wire; (2) bundle of 15 or more wires; (3) 70 C environment: and (4) vacuum of 10(exp -5) torr or less. To determine the behavior and temperature of electrical wire at different operating conditions, a thermal vacuum test was performed on a representative electrical harness of the Hubble Space Telescope (HST) power distribution system. This paper describes the test and the results.

Lundquist, Ray A.; Leidecker, Henning

1998-01-01

348

Analysis of Cable Stayed Bridges for Snapped Cables.  

National Technical Information Service (NTIS)

The purpose of this report is to describe the computer program CSB which will perform both a static and a dynamic snapped cable analysis of a cable stayed bridge. In the static analysis the final deformed shape of the bridge and the member end loads (i.e....

J. F. Fleming W. L. Hess

1994-01-01

349

76 FR 32866 - Cable Landing Licenses; Correction  

Federal Register 2010, 2011, 2012, 2013

...COMMISSION 47 CFR Part 1 [DA 11-668] Cable Landing Licenses; Correction AGENCY: Federal...requesting streamlined processing of cable landing license applications. Need for Correction...read as follows: Sec. 1.767 Cable landing licenses. * * * * * (j)...

2011-06-07

350

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

351

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

352

Flow about yawed, stranded cables  

NASA Astrophysics Data System (ADS)

The development of a steady lift force on a stranded cable, which is yawed with respect to a flow, is a unique characteristic of a cable when compared to a circular cylinder. Comparisons of lift and normal drag coefficients and wake characteristics were made between stranded cable models and the cylinder. These were based upon surface pressure and hot-wire measurements and flow visualization studies conducted in a low speed wind tunnel on rigid cables and cylinders. The models were yawed to four different yaw angles and tested within the Reynolds number range of 5,000 and 50,000. Pressure profiles for the yawed cables indicated that the lift force is directed towards the side where the primary strands are more nearly aligned with the flow. The pressure profiles also indicated that the lift force is generated by asymmetric separation. The small scale irregularities associated with wires within individual strands also appeared to have an effect on the cable's lift and drag characteristics. Results show that cables have significantly different shedding characteristics and near-wake shear layer structure when compared to the circular cylinder. For the flow regime tested, the Strouhal number showed no dependence on Reynolds number nor spanwise position along the cable.

Nebres, J.; Batill, S.; Nelson, R.

1993-12-01

353

Wikipedia: Cable-Stayed Bridge  

NSDL National Science Digital Library

This site contains a description of cable-stayed bridges and their advantages, illustrated by numerous photographs. It has a thorough explanation of the differences between the cable-stayed bridge and the suspension bridge, both in design and in the manner of construction. Variations and related types are shown, and links are included to a large number of examples.

2006-07-01

354

RHIC transfer line cable database.  

National Technical Information Service (NTIS)

A cable database was created to facilitate and document installation of cables and wiring in the RHIC project, as well as to provide a data source to track possible wiring and signal problems. The eight tables of this relational database, currently implem...

E. H. Scholl T. Satogata

1995-01-01

355

Insulation Material  

NASA Technical Reports Server (NTRS)

Manufactured by Hitco Materials Division of Armco, Inc. a ceramic fiber insulation material known as Refrasil has been used extensively as a heat-absorbing ablative reinforcement for such space systems as rocket motor nozzles, combustion chambers, and re-entry shields. Refrasil fibers are highly porous and do not melt or vaporize until fibers exceed 3,100 degrees Fahrenheit. Due to these and other properties, Refrasil has found utility in a number of industrial high temperature applications where glass, asbestos and other materials fail. Hitco used this insulation to assist Richardson Co., Inc. in the manufacturing of hard rubber and plastic molded battery cases.

1984-01-01

356

Aging of polymeric and composite insulating materials. Aspects of interfacial performance in aging  

Microsoft Academic Search

Aging of polymeric and composite materials is reviewed mainly from the standpoint of their interfacial performance. Insulating materials can be divided into simple polymers and composites. Polymers for power cables, transformers, insulators and rotating machines consist of thermoplastics such as PE, PET and PPS, elastomers such as silicone, EPR and EPDM, and thermosets such as epoxy. Composites for GIS, rotating

T. Tanaka

2002-01-01

357

Proceedings of the 39th International Wire and Cable Symposium  

National Technical Information Service (NTIS)

Technical Sessions: Global Markets for Communication Cables, Optical Fiber and Cable design I, Copper Telecommunication Cables and Networks, Military Applications, Optical Fiber and Cable Design II, Environmental Effects on Cables and Systems, Splicing an...

1990-01-01

358

Riding the reflected wave-IGBT drive technology demands new motor and cable considerations  

Microsoft Academic Search

Drive manufacturer migration to insulated gate bipolar transistor (IGBT) output devices demands a more careful selection of motors and load cables. IGBT drives have faster output voltage risetimes which have increased the dielectric voltage stress placed on the motor. Semiconductor risetime now has a greater influence on motor transient voltages, emphasizing the need to understand the reflected wave phenomenon and

Lawrence A. Saunders; G. L. Skibinski; Steve T. Evon; David L. Kempkes

1996-01-01

359

Novel online RF technique for detection of water trees in underground powered distribution cables  

Microsoft Academic Search

In this paper we investigate the use of RF signals to measure dielectric loss and the change of permittivity of an energized cable's insulation. One common degradation mechanism is growth of water trees in the presence of water. We present theoretical analysis of a novel on-line water tree detection technique based on using RF TEM wave propagation via test points

A. Giovanni Gonzalez; Igor Paprotny; Richard M White; Paul K. Wright

2011-01-01

360

PRACTICAL ISSUES REGARDING THE USE OF DIELECTRIC MEASUREMENTS TO DIAGNOSE THE SERVICE HEALTH OF MV CABLES  

Microsoft Academic Search

During the last decade, Very Low Frequency (VLF) testing for extruded distribution cables has gained interest among the North American utilities. The increasing interest is evidenced by recent research publications and discussions inside the expert community in which standards are being proposed and continuously discussed. While there is a general consensus as to the meaning of insulation dielectric properties, many

Jean HERNANDEZ; Nigel HAMPTON; Richard HARTLEIN

361

Effect of combined transmission line (overhead line\\/cable) on power system reliability indices  

Microsoft Academic Search

Reliability is a very important factor in designing of power network, because in the power system with low reliability, maintenance costs for power system is increased and causes creating damage that it is not compensated. Combined transmission line with cable line has considerable effects on power system reliability indices, because high voltage insulations are weak points in power systems in

Y. Damchi; J. Sadeh

2010-01-01

362

Window insulator  

SciTech Connect

An insulator for mounting to a window. A pair of plastic layers including a plurality of partitions positioned therebetween form air pockets between the layers. A plurality of suction cups and suction grooves arranged in rows on one outer surface of the sheet removably secure the sheet to a window. The sheet includes a circumferentially extending recessed portion receiving the window frame.

Nesbitt, W. A.

1985-10-01

363

Method for improving performance of highly stressed electrical insulating structures  

Microsoft Academic Search

Removing the electrical field from the internal volume of high-voltage structures; e.g., bushings, connectors, capacitors, and cables. The electrical field is removed from inherently weak regions of the interconnect, such as between the center conductor and the solid dielectric, and places it in the primary insulation. This is accomplished by providing a conductive surface on the inside surface of the

Michael J. Wilson; David A. Goerz

2002-01-01

364

Apparatus for improving performance of electrical insulating structures  

Microsoft Academic Search

Removing the electrical field from the internal volume of high-voltage structures; e.g., bushings, connectors, capacitors, and cables. The electrical field is removed from inherently weak regions of the interconnect, such as between the center conductor and the solid dielectric, and places it in the primary insulation. This is accomplished by providing a conductive surface on the inside surface of the

Michael J. Wilson; David A. Goerz

2002-01-01

365

Predictive aging results for cable materials in nuclear power plants  

SciTech Connect

In this report, we provide a detailed discussion of methodology of predicting cable degradation versus dose rate, temperature, and exposure time and its application to data obtained on a number of additional nuclear power plant cable insulation (a hypalon, a silicon rubber and two ethylenetetrafluoroethylenes) and jacket (a hypalon) materials. We then show that the predicted, low-dose-rate results for our materials are in excellent agreement with long-term (7 to 9 years), low dose-rate results recently obtained for the same material types actually aged under nuclear power plant conditions. Based on a combination of the modelling and long-term results, we find indications of reasonably similar degradation responses among several different commercial formulations for each of the following generic'' materials: hypalon, ethylenetetrafluoroethylene, silicone rubber and PVC. If such generic'' behavior can be further substantiated through modelling and long-term results on additional formulations, predictions of cable life for other commercial materials of the same generic types would be greatly facilitated. Finally, to aid utilities in their cable life extension decisions, we utilize our modelling results to generate lifetime prediction curves for the materials modelled to data. These curves plot expected material lifetime versus dose rate and temperature down to the levels of interest to nuclear power plant aging. 18 refs., 30 figs., 3 tabs.

Gillen, K.T.; Clough, R.L.

1990-11-01

366

Evaluation of pipe-type cable joint restraint systems  

SciTech Connect

the purpose of this project was to evaluate two systems for restraining the movement of 345kV high-pressure oil-filled (HPOF) cable joints during load cycling. Problems with joints and adjacent cables due to thermomechanical bending (TMB) experienced by the Consolidated Edison Company of New York and Public Service Electric Gas Company of New Jersey are reviewed. Some approaches to reducing or preventing TMB induced damage to HPOF pipe type cable joints are discussed. The design and operation of a special test apparatus for simulating TMB effects under laboratory conditions is described. One of the two joint restraint systems evaluated under this project was developed by PSE G and employed wedging devices, which could be retrofitted into existing installations, that limited the longitudinal movement of the joints during load cycling. The other system developed by Pirelli Cable Corporation applied the restraining force to the cylindrical portion of the hand applied joint insulation by means of support spiders and steel rods attached to the reducer faces. The test results show that the PSE G restraint system can effectively limit joint longitudinal movement while causing a minimal amount of mechanical disturbance to the joint stress cones. The test results obtained with the PCC system are inconclusive and indicate that further refinement and testing are required to demonstrate the effectiveness of this promising joint restraint system.

Silver, D.A.; Seman, G.W. (Pirelli Cable Corp., Lexington, SC (USA))

1990-03-01

367

Effect of corrugated characteristics on the liquid nitrogen temperature field of HTS cable  

NASA Astrophysics Data System (ADS)

In the high temperature superconducting (HTS) cable system, liquid nitrogen is usually chosen to be the coolant because of its low saturation temperature and large latent heat of vaporization. Thus, it is very important for superconducting cables that the liquid nitrogen temperature field keeps stable. However, the cryostat is usually made of flexible corrugated pipes and multi-layer insulation materials. The characteristics (e.g. wave pitch and wave depth) of corrugated pipes may have an effect on the heat exchange between cable and liquid nitrogen, even the whole temperature field of liquid nitrogen. In this paper, a two-dimensional model for 30 m long HTS cable has been modified to analyze the effect of corrugated characteristics on the temperature field of liquid nitrogen. The liquid nitrogen temperature difference between the outlet and the inlet of passage gradually increases as the wave pitch of the corrugated tube decreases and the wave depth increases.

Li, Z. M.; Li, Y. X.; Zhao, Y. Q.; Gao, C.; Qiu, M.; Chen, G. F.; Gong, M. Q.; Wu, J. F.

2014-01-01

368

Influence of strand surface condition on interstrand contact resistance and coupling loss in NbTi-wound Rutherford cables  

Microsoft Academic Search

Presented in this work are the results of directly measured and AC-loss-derived interstrand contact resistance (ICR) measurements performed magnetically or resistively on bare-Cu and coated-strand pairs, calorimetrically on 11-strand Rutherford cables wound with strands that had been coated with various metallic and insulating layers, and calorimetrically and magnetically on 28-strand Rutherford cables (LHC-type) wound with bare-Cu-, Ni-, and stabrite-plated strands.

M. D. Sumption; E. W. Collings; R. M. Scanlan; A. Nijhuis; H. H. J ten Kate; S. W. Kim; M. Wake; T. Shintomi

1999-01-01

369

Robotic platform for monitoring underground cable systems  

Microsoft Academic Search

Accurate, real-time information about the aging status of the power distribution cable network can save the power industry millions of dollars lost due to line failures and premature replacement of cables. Hence, a novel, semi-autonomous robotic sensor platform has been developed for monitoring underground, power distribution cable systems. A segmented, legged modular configuration allows the robot to traverse cables with

B. Jiang; P. Stuart; M. Raymond; D. Villa; A. V. Mamishev

2002-01-01

370

SGEMP Response of Large, Multiwire Satellite Cables  

Microsoft Academic Search

This paper presents the analytical and experimental results of the first successful SGEMP photon test on large, multiwire satellite cables and high pin density, flight-qualified connectors. These cables and connectors were specifically designed for light-weight, high RF attenuation characteristics and low SGEMP response. The cable configurations evaluated included straight, two connector types as well as a large cable bundle wi

Dante M. Tasca; Everett T. Raylman; Btrian L. Beers; John E. Tigner

1978-01-01

371

Investigation of High-Tension Cable Joints  

Microsoft Academic Search

With suitable cable, the successful operation of a high-tension cable system depends on the joints between consecutive lengths and this phase of high-voltage cable installation must receive considerable attention in the near future. The essential properties of a good cable joint are: 1. Simplicity of design 2. High dielectric strength 3. Low dielectric loss The dielectric strength of a joint,

E. W. Davis; G. J. Crowdes

1925-01-01

372

Optical subscriber cable technologies in Japan  

Microsoft Academic Search

An overview is given of recent development of subscriber optical cable technologies in Japan. Technologies for constructing a star network using high count fiber cable have been developed. The effect of this development on the cable distribution system, fiber selection, cable structure, splices and connectors, and closure and measurement technology is described. Field trials and features of these technologies are

Fumihiro Nihei; Yoshikazu Yamamoto; Nobuya Kojima

1987-01-01

373

FLAT-SAG CABLES WITH SEMIACTIVE DAMPING  

Microsoft Academic Search

Cables, such as are used in cable-stayed bridges, suspension bridges, guy wires, transmission lines, and flexible space structures, are prone to vibration due to their low inherent damping characteristics. The mitigation of cable vibration is necessary to minimize negative impact. Transversely-attached passive viscous dampers have been implemented on some cables to dampen vibration. However, it can be shown that only

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

2002-01-01

374

SEMIACTIVE DAMPING OF CABLES WITH SAG  

Microsoft Academic Search

Cables, such as are used in cable-stayed bridges, suspension bridges, guy wires, transmission lines, and flexible space structures, are prone to vibration due to their low inherent damping characteristics. The mitigation of cable vibration is necessary to minimize negative impact. Transversely-attached passive viscous dampers have been implemented on some cables to dampen vibration. However, it can be shown that only

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

2000-01-01

375

CORED RUTHERFORD CABLES FOR THE GSI FAST RAMPING SYNCHROTRON.  

SciTech Connect

The new heavy ion synchrotron facility proposed by GSI will have two superconducting magnet rings in the same tunnel, with rigidities of 200T-m and 100T.m. Fast ramp times are needed, which can cause significant problems for the magnets, particularly in the areas of s c loss and field distortion. This paper discusses the 200T.m ring, which will use Cos0 magnets based on the RHIC dipole design. We discuss the reasons for choosing Rutherford cable with a resistive core and report loss measurements carried out on cable samples. These measurements are compared with theoretical calculations using measured values of inter-strand resistance. Reasonably good agreement is found, but there are indications of non-uniformity in the adjacent resistance R,. Using these measured parameters, losses and temperature rise are calculated for a RHIC dipole in the operating cycle of the accelerator. A novel insulation scheme designed to promote efficient cooling is described.

WILSON,M.N.; GHOSH,A.K.; TEN HAKEN,B.; HASSENZAHL,W.V.; KAUGERTS,J.; MORITZ,G.; MUEHLE,C.; DEN OUDEN,A.; SOIKA,R.; WANDERER,P.; WESSEL,W.A.J.

2002-08-04

376

An Apparatus for Monitoring the Health of Electrical Cables  

NASA Technical Reports Server (NTRS)

As with most elements of infrastructure, electrical wiring is innocuous; usually hidden away and unnoticed until it fails. Failure of infrastructure, however, sometimes leads to serious health and safety hazards. Electrical wiring fails when the polymeric (usually rubber) insulation material that sheathes the conductor gets embrittled with age from exposure to pressure, temperature or radiation cycling or when the insulation gets removed by the chafing of wires against each other. Miles of such wiring can be found in typical aircraft, with significant lengths of the wiring immersed in aviation fuel - a recipe for an explosion if a spark were to occur. Diagnosing the health of wiring is thus an important aspect of monitoring the health of aging aircraft. Stress wave propagation through wiring affords a quick and non-invasive method for health monitoring. The extent to which a stress wave propagating through the cable core gets attenuated depends on the condition of the surrounding insulation. When the insulation is in good condition - supple and pliable, there is more damping or attenuation of the waveform. As the insulation gets embrittled and cracked, the attenuation is likely to reduce and the waveform of the propagating stress wave is likely to change. The monitoring of these changes provides a potential tool to evaluate wiring or cabling in service that is not accessible for visual inspection. This experiment has been designed for use in an introductory mechanical or materials engineering instrumentation lab. Initial setup (after procuring all the materials) should take the lab instructor about 4 hours. A single measurement can be initiated and saved to disk in less than 3 minutes, allowing for all the students in a typical lab section to take their own data rather than share a single set of data for the entire class.

Pai, Devdas M.; Tatum, Paul; Pace, Rachel

2004-01-01

377

Wind-induced vibration of cables of cable-stayed bridges  

Microsoft Academic Search

This paper describes the aerodynamic vibration characteristics of both fullscale cables of cable-stayed bridges and the cable models in the wind tunnel tests. The wavelet analysis is applied in order to clarify the nonstationary characteristics of cable vibration and the mechanism of the low frequency component of vortex shedding and lift force fluctuation. Furthermore, the cable with elliptical thick plates

Masaru Matsumoto; Yoshiyuki Daito; Takashi Kanamura; Yoshinori Shigemura; Satoru Sakuma; Hiroshi Ishizaki

1998-01-01

378

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

379

Current distribution and re-distribution in HTS cables made from 2nd generation tapes  

NASA Astrophysics Data System (ADS)

Current redistribution in carpet-stack cables made from 2nd generation HTS tapes is investigated. In the carpet stack geometry tapes are stacked with their broad faces parallel to each other to build up a cable. Current redistribution in HTS cables is complex because the built-in insulation layer in each tape prevents effective current transfer between tapes. A method of shunting the tapes using periodically distributed superconducting bridges is investigated to improve current transfer, avoiding the need to solder the cable together. We calculate the mutual inductance between different tapes in a cable, and the effective resistance/transconductance for representative cable configurations. The effective time constants for current transfer and current redistribution are then calculated under different assumptions. We show that periodic shunting of the tapes using distributed superconducting bridges is an attractive method to achieve uniform current distribution in a HTS cable. The solution is flexible, and the performance of the system can be optimized by changing the width of shunt and/or the distance between shunts.

Bromberg, L.; Takayasu, M.; Michael, Philip; Minervini, J. V.; Dietz, Anthony

2012-06-01

380

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

381

Residential Flat Conductor Cable Systems.  

National Technical Information Service (NTIS)

This study concludes that Flat Conductor Cable (FCC) systems are technically viable and are cost - effective in many types of rehabilitation construction. Furthermore, a sufficiently large market exists to warrant the required development and marketing ef...

J. Belilove

1981-01-01

382

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

383

Effects of shields on cables  

NASA Technical Reports Server (NTRS)

Aircraft wiring subjected to rapidly changing electromagnetic fields was considered. The ways in which shielded cables reduce surge voltages were studied along with the ways in which common practice regarding the use of shields may be at variance with the use required for the control of lightning effects. Courses in which this apparent conflict of use may be resolved were suggested. Noise currents flowing on shields of cables related to the noise signals coupled onto signal conductors were also investigated.

1977-01-01

384

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

385

Marine streamer cable recovery system  

SciTech Connect

Selected sections of a seismic streamer cable are provided with an acoustically-triggered compressed gas supply. The acoustic triggering devices associated with each compressed gas supply may be individually addressed by a coded signal. In the event that the streamer cable is severed, the gas supplies of the severed sections of the streamer are used to inflate the jackets of those severed sections so that they will float to the water surface for salvage.

Thigpen, B. B.

1985-09-10

386

Far-infrared laser inspection system for cable  

SciTech Connect

A laser scanner prototype has been developed for production line inspection of voids and contaminants in cross-linked polyethylene insulation which is extruded over the conductor employed in the underground electric power distribution network. This prototype consists of a far-infrared laser operating at a laser wavelength of 118.8 {mu}m, a high-speed (0 to 9000 rpm) optical scanner, and an electronic controller and signal processor. This laser/cable inspection system is fully automated and has been successfully laboratory tested. 7 refs., 21 figs.

Cheo, P.K.; Farina, J.D.; Rubino, R.A. (United Technologies Research Center, East Hartford, CT (USA))

1989-11-01

387

Electrical/mechanical evaluation of high voltage dielectrics for OTEC riser cables  

SciTech Connect

The unique design and test requirements for the cable dielectrics selected for evaluation for use in Ocean Thermal Energy Conversion plants are described. Specifically, the methodology of developing the test procedure is defined. The basic cable dielectrics selected for evaluation include taped/oil-impregnated insulation, and extruded solid cross-linked polyethylene insulation. These cables are designed to transmit 100 MW at 138 kV, and will be subjected to installation and operating conditions that are unprecedented for any power cable system. These conditions include ocean depths of 4000 to 5000 feet, long vertical suspension, and the motions and forces imparted by the plant and ocean. The developmental test program is designed primarily to determine the weak link in the components of the candidate cable with regard to the ability to successfully withstand the unusual OTEC conditions over a 10 to 30 year lifetime. Two basic areas of concern are the mechanical fatigue of metallic sheaths and strength members, and the electrical/mechanical ''fatigue'' of the dielectric and shielding components. The constraints and problems in such testing are addressed, and the engineering solutions are described. Finally, the scheduled plan for completion of the entire development test plan is defined.

Traut, R. T.; Kurt, J. P.; DiPietro, F. M.; Roberts, K. P.

1980-01-01

388

Complete book of insulating  

SciTech Connect

Insulating makes significant energy conservation possible at relatively modest cost for most householders. Chapters presented are: Making Your Home into an Island; Understanding Heat Flow in Buildings; Weatherstripping and Caulking; Properties of Insulating Materials; Retrofitting Insulation; Installing Insulation in New Buildings; Coping with Other Energy Losers; and Laws, Government Programs, and Codes Affecting Insulation.

Albright, R.; Gay, L.; Stiles, J.; Worman, E.C.; Worman, N.P.; Zak, D.

1980-01-01

389

The development of ShortWatch, a novel overtemperature or mechanical damage sensing technology for wires or cables. Final report  

SciTech Connect

'ShortWatch' is a patented technology which for the first time offers electrical wire/cable products providing real-time, 'in-situ' (1) condition monitoring that warns of insulation damage before an electrical fault occurs, (2) assessment of the ability to perform in a Design Basis event, (3) distributed sensor warning of overtemperature, and (4) insulation leakage measurement capability providing arc sensing and a reliable tool for wire age prediction.

Watkins, Ken; Morris, Jack; Wong, C.P.; Luo, Shijian

2001-09-07

390

The RHIC transfer line cable database  

SciTech Connect

A cable database was created to facilitate and document installation of cables and wiring in the RHIC project, as well as to provide a data source to track possible wiring and signal problems. The eight tables of this relational database, currently implemented in Sybase, contain information ranging from cable routing to attenuation of individual wires. This database was created in a hierarchical scheme under the assumption that cables contain wires -- each instance of a cable has one to many wires associated with it. This scheme allows entry of information pertinent to individual wires while only requiring single entries for each cable. Relationships to other RHIC databases are also discussed.

Scholl, E.H.; Satogata, T.

1995-05-01

391

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

392

Lightweight Insulated Footwear.  

National Technical Information Service (NTIS)

Compound formulations having good low temperature flexibility were developed for the outsole, upper and outer skin of the lightweight insulated boot. The proper insulation thickness for the entire boot was determined from foot insulation test data to prod...

R. A. Mazzeo

1971-01-01

393

Cryogenic Insulation Development.  

National Technical Information Service (NTIS)

Multilayer insulations for long term cryogenic storage are described. The devulted 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 ...

K. E. Leonhard

1972-01-01

394

Cable parametric oscillation and its control for cable-stayed bridges  

NASA Astrophysics Data System (ADS)

The stay cables in cable-stayed bridges are prone to exhibiting oscillation of large amplitude due to their large flexibility, small mass, and small damping. Continued oscillation of the cables may seriously influence the safety and durability of cable-stayed bridges. Apart from the rain- wind-induced cable vibration, large-amplitude oscillation of cables caused by parametric excitation due to support motion was recently observed in cable-stayed bridges. This kind of cable oscillation is produced by the deck and/or tower motion induced either by moving traffic or by buffeting response of gust wind. The oscillation mechanisms and control methods of stay cables excited by the deck and/or tower motion are less studied than the rain-wind-induced vibration. In this paper, a nonlinear dynamic model for the simulation and analysis of a kind of parametrically excited vibration of stay cables caused by support motion in cable- stayed bridges has been proposed.

Sun, Bing Nan; Wang, Zhi Gang; Ko, Jan Ming; Ni, Yi Qing

2001-07-01

395

The effect of particulate debris on the insulation integrity of SSC coils during molding and collaring  

SciTech Connect

In order to simulate the effect of accidentally introduced debris on SSC coil insulation integrity, models consisting of two pieces of insulated SSC cable have been loaded in an hydraulic press after introducing foreign particles between the layers. The tests were originally suggested by R. Palmer of the SSC Laboratory. A high voltage (2 Kv) was continually applied between the two cables and the load gradually increased until an electrical short occurred. The high voltage was used as an easy method of detecting insulation punctures and to continue the general type of testing begun at Brookhaven by J. Skaritka, now at the SSC Laboratory, and continued at Fermilab by F. Markley and presented at last year's session of the Conference. A range of particles of different size, shape, and hardness were used, and both conducting and insulating particles were included. Fine wires were also used. When the data are normalized using the control (no particles added), data for each cable batch used, there is a slight correlation between pressure at breakdown and particle size for cables insulated with Kapton only. Adjustment must be made for soft particles that tend to deform and for particles with aspect ratios greater than one. Additional measurements have also been made where the opoxy-fiberglass layer was added to the Kapton insulation overwrap. These show a correlation between conductivity and breakdown pressure. 1 ref., 7 figs.

Nehrlich, E.; Markley, F.; Rogers, D.

1991-03-01

396

The effect of particulate debris on the insulation integrity of SSC coils during molding and collaring  

SciTech Connect

In order to simulate the effect of accidentally introduced debris on SSC coil insulation integrity, models consisting of two pieces of insulated SSC cable have been loaded in an hydraulic press after introducing foreign particles between the layers. The tests were originally suggested by R. Palmer of the SSC Laboratory. A high voltage (2 Kv) was continually applied between the two cables and the load gradually increased until an electrical short occurred. The high voltage was used as an easy method of detecting insulation punctures and to continue the general type of testing begun at Brookhaven by J. Skaritka, now at the SSC Laboratory, and continued at Fermilab by F. Markley and presented at last year`s session of the Conference. A range of particles of different size, shape, and hardness were used, and both conducting and insulating particles were included. Fine wires were also used. When the data are normalized using the control (no particles added), data for each cable batch used, there is a slight correlation between pressure at breakdown and particle size for cables insulated with Kapton only. Adjustment must be made for soft particles that tend to deform and for particles with aspect ratios greater than one. Additional measurements have also been made where the opoxy-fiberglass layer was added to the Kapton insulation overwrap. These show a correlation between conductivity and breakdown pressure. 1 ref., 7 figs.

Nehrlich, E.; Markley, F.; Rogers, D.

1991-03-01

397

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

398

Rotatable electric cable connecting system  

NASA Technical Reports Server (NTRS)

A cable reel assembly is described which is particularly adapted for, but not limited to, a system for providing electrical connection of power and data signals between an orbiter vehicle, such as a space shuttle, and a recovered satellite. The assembly is comprised of two mutually opposing ring type structures having 180 deg relative rotation with one of the structures being held in fixed position while the other structure is rotatable. Motor controlled berthing latches and umbilical cable connectors for the satellite are located on the rim of the rotatable ring structure. The electrical cable assembly is fed in two sections from the orbiter vehicle into the outer rim portion of the fixed ring structure where they are directed inwardly and attached to two concentrically coiled metal bands whose respective ends are secured to inner and outer post members of circular sets of guide pins located on opposing circular plate members, one rotatable and one fixed. The cable sections are fed out as three output cable sections through openings in the central portion of the circular plate of the rotatable ring structure where they are directed to the latches and connectors located on its rim.

Manges, D. R. (inventor)

1985-01-01

399

7 CFR 1755.507 - Aerial cable services.  

Code of Federal Regulations, 2011 CFR

...service cable shall be spliced to the main cable in accordance with § 1755.200, RUS standard for splicing copper and fiber optic cables. (4) Where practicable, aerial cable shall pass under electrical guys, distribution secondaries, and...

2014-01-01

400

Gap Filling Ceramic Insulating Putty for High Field Magnets  

NASA Astrophysics Data System (ADS)

Gaps between the A15 superconducting cable and its supports can sometimes occur requiring expensive rework of the support or filling with a non-optimal material. Recently, a new ceramic putty has been developed that can fill these gaps to fully support the superconducting cable. This ceramic material can withstand the extreme temperature differences between the high temperature heat treatment and the cryogenic operation. Significant performance improvements have been made that will enable the insulating putty to be used in some accelerator magnet systems. Processing methods will be discussed as well as strength and thermal data.

Rice, J. A.; Rice, H. M.

2008-03-01

401

GAP FILLING CERAMIC INSULATING PUTTY FOR HIGH FIELD MAGNETS  

SciTech Connect

Gaps between the A15 superconducting cable and its supports can sometimes occur requiring expensive rework of the support or filling with a non-optimal material. Recently, a new ceramic putty has been developed that can fill these gaps to fully support the superconducting cable. This ceramic material can withstand the extreme temperature differences between the high temperature heat treatment and the cryogenic operation. Significant performance improvements have been made that will enable the insulating putty to be used in some accelerator magnet systems. Processing methods will be discussed as well as strength and thermal data.

Rice, J. A.; Rice, H. M. [MultiPhase Composites, LLC Longmont, CO, 80501 (United States)

2008-03-03

402

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

403

Development of an Innovative Insulation for Nb3Sn Wind and React Coils  

SciTech Connect

At the present time, Nb3Sn is the best superconductor candidate for the realization of high field magnets (>10-11 teslas). However its implementation remains delicate because of the great brittleness of material after the heat treatment necessary to form the Nb3Sn compounds. The conventional insulation for Nb3Sn wind and react coils requires performing, after the heat treatment, a vacuum resin impregnation, which adds to the cost and raises failure risk. We propose a one-step innovating ceramic insulation deposited directly on the un-reacted conducting cable. The conducting cable is wound according to conventional techniques and, after the heat treatment necessary to the form the Nb3Sn, we obtain a coil having a mechanical cohesion, while maintaining a proper conductor positioning and a suitable electric insulation. We will have studied the electric properties of superconducting cable isolated at the room temperature and at 4.2 K.

Puigsegur, A. [CEA Saclay, DSM - DAPNIA - SACM, Gif-sur-Yvette, 91191 (France); Institut Europeen des Membranes (CNRS UMR 5635), 1919 Route de Mende, Montpellier, F-34293 (France); Rondeaux, F.; Samoogabalan, K. [CEA Saclay, DSM - DAPNIA - SACM, Gif-sur-Yvette, 91191 (France); Prouzet, E. [Institut Europeen des Membranes (CNRS UMR 5635), 1919 Route de Mende, Montpellier, F-34293 (France)

2004-06-28

404

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

405

Evaluation of Cable Harness Post-Installation Testing. Part B  

NASA Technical Reports Server (NTRS)

The Cable Harness Post-Installation Testing Report was written in response to an action issued by the Ares Project Control Board (PCB). The action for the Ares I Avionics & Software Chief Engineer and the Avionics Integration and Vehicle Systems Test Work Breakdown Structure (WBS) Manager in the Vehicle Integration Office was to develop a set of guidelines for electrical cable harnesses. Research showed that post-installation tests have been done since the Apollo era. For Ares I-X, the requirement for post-installation testing was removed to make it consistent with the avionics processes used on the Atlas V expendable launch vehicle. Further research for the report involved surveying government and private sector launch vehicle developers, military and commercial aircraft, spacecraft developers, and harness vendors. Responses indicated crewed launch vehicles and military aircraft perform post-installation tests. Key findings in the report were as follows: Test requirements identify damage, human-rated vehicles should be tested despite the identification of statistically few failures, data does not support the claim that post-installation testing damages the harness insulation system, and proper planning can reduce overhead associated with testing. The primary recommendation of the report is for the Ares projects to retain the practice of post-fabrication and post-installation cable harness testing.

King, M. S.; Iannello, C. J.

2011-01-01

406

AC losses of the 5 m BSCCO cables with shield  

NASA Astrophysics Data System (ADS)

In order to research the AC loss characteristics of a multi-layered conductor and a shield in a high temperature superconductor (HTS) cable, we prepared two short cable samples, which are the same as the 22.9 kV/50 MVA HTS-cable installed at Gochang test yard of Korea Electric Power Corporation, and attached voltage-leads to both the conductor and the shield. To investigate the effect of transport period on their AC losses, we also applied current with the same magnitude and opposite direction to the conductor and the shield from a few cycles to several minutes. The tests show that the AC loss measured from the lead attached to the shield (shield-lead) is constant regardless of transport period. But the measured loss from the lead attached to the conductor (conductor-lead) is greatly dependent on transport period. It seems to be caused by difficulty in heat transfer to the surrounding coolant due to thick insulator around the conductor. As transport period becomes longer, the conductor’s temperature rises and thus the AC loss measured from the conductor-lead increases. In addition, the measured loss from the conductor-lead is 1.5 times larger than that from the shield-lead, particularly for the transport period of a few cycles.

Ryu, K.; Ma, Y. H.; Li, Z. Y.; Hwang, S. D.; Song, H. J.

2010-11-01

407

Ruggedized Cable Assembly for PCM Equipment.  

National Technical Information Service (NTIS)

Report summarizes engineering processes to improve cable assembly CX-4245/G. Working to a specified weight limitation, cable with improved shielding effectiveness and greater breaking strength and an entirely new hermaphrodite connector were developed. Th...

C. F. Engler G. R. Leef

1967-01-01

408

The Status of Cable Communications in Libraries.  

National Technical Information Service (NTIS)

Librarians are and will be using cable television technologies to enhance and extend their services. While questions remain in regard to the technology itself, the health and viability of the industry, and government policy, librarians are seeing cable co...

B. L. Kenney

1974-01-01

409

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

410

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

411

Strain Gage Instrumentation of a Buoyant Cable.  

National Technical Information Service (NTIS)

The strain gage instrumentation of a buoyant cable used for submarine ELF receiving antennas is presented. Techniques were developed to bond the strain gage reliably to the polyethylene cable jacket and to seal the jacket using an injection molding proces...

O. G. Nackoney

1972-01-01

412

Folding tools for flat conductor cable harnesses  

NASA Technical Reports Server (NTRS)

Vise grip pliers have detachable metal gripping plates which are changed to accommodate cables from 1 to 3 in. wide and to form any desired fold angle. A second tool squeezes cable along crease to complete the fold.

Loggins, R.

1971-01-01

413

Manufacture of flat-conductor cable  

NASA Technical Reports Server (NTRS)

Report discusses cable design and fabrication of both unshielded and shielded FCC. Discussion includes numerous cable configurations and fabrication processes, such as laminating, etching, extruding, and weaving. Bibliography lists additional references.

Angele, W.

1976-01-01

414

Cable Television: From Here to Where?  

ERIC Educational Resources Information Center

A brief description is presented of the present uses, regulatory structure, and future potentials of cable television for Canada. Some 30% of Canada is already wired for cable, as opposed to 9% in the United States. (RH)

Canadian Cable Television Association, Ottawa (Ontario).

415

Data Base On Cables And Connectors  

NASA Technical Reports Server (NTRS)

Report describes Connector Adapter Cable Information Data Base (CONNAID) computer program, managing data base containing necessary information concerning electrical connectors, breakout boxes, adapter cables, backshells, and pertinent torque specifications for engineering project.

Bowen, Arlen R.; Oliver, John D.

1995-01-01

416

Cable Boxes for Distribution Call Boxes.  

National Technical Information Service (NTIS)

The document establishes standards for the manufacture and testing of telephone cable boxes, including terminal blocks. Diagrams are provided which show the configuration of various models designed to accommodate telephone cables of different sizes. (Auth...

B. A. Remizov M. I. Popov O. P. Kartinkinya K. K. Gosiya

1969-01-01

417

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

418

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

419

Charges and Discharges in HVDC Cables in Particular in Mass-Impregnated HVDC Cables.  

National Technical Information Service (NTIS)

Mass-impregnated HVDC (High Voltage Direct Current) cables are just as reliable as high voltage, AC cables. However, there is still a lack of knowledge concerning HVDC cables. In addition , the tests for HVDC cables are less well developed that those for ...

M. J. P. Jeroense

1997-01-01

420

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

421

Interoperability enhancement for cable host navigation  

Microsoft Academic Search

The national standard of digital cable broadcasting in Korea as well as in North America has its root from the OpenCable and OpenCable Application Platform (OCAP). However, OCAP may have interoperability problems when an OpenCable-certified host is moved to a different service area where extended Application Programming Interfaces (API) not defined in the standard are used or code version management

Joonhee Yoon

2010-01-01

422

Parametric studies on cable-stayed bridges  

Microsoft Academic Search

Parametric studies on cable-stayed bridges are performed in the paper for investigating the individual influence of different sources of nonlinearity in such bridges. The sources of nonlinearity in the cable-stayed bridge mainly include the large deflection, beam-column and cable sag effects. The influence of such kind of effects on the analysis and the structural behavior of cable-stayed bridges has been

Pao-Hsii Wang; Chiung-Guei Yang

1996-01-01

423

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

424

FOA Lecture 4: Fiber Optic Cables  

NSDL National Science Digital Library

This is the 4th lecture on fiber optics by Jim Hayes, president of the Fiber Optic Association. This lecture covers fiber optic cables. Cables are used to protect the fibers in the installation environment, outdoors or indoors. In this lecture, Hayes covers the requirements of cables for various applications and the types of cables typically used. Running time for the lecture is 10:15. Flash is required to view the video.

Hayes, Jim

2013-07-05

425

Termination of cylindrical grooved optical cables  

NASA Astrophysics Data System (ADS)

A zero loss termination system adapted to cylindrical grooved (or slotted core) cables is described that provides individual protection of each fiber at a breakout point without the need to cut or splice the fibers. Applications of this device are described, for example, the design of termination subassemblies (cable termination boxes, distribution frames, drop terminals) in the French wired city of BIARRITZ, cable splicing organization including high density cables and various subassemblies for videocommunication networks.

Bouvard, A.; Hulin, J. P.; Devecchis, M.; Poulson, W. J.

426

Load criteria for OTEC riser cable design  

Microsoft Academic Search

A method for determining fatigue loading of the OTEC electrical riser cable is presented. Sources of loading on the cable including steady loads such as cable weight and hydrostatic pressure, and unsteady loads - flow induced vibration, thermal stresses and internal waves - are discussed. Other factors which affect loading conditions, creep, corrosion, abrasion, and marine organisms are considered. Static

J. C. Oliver; W. K. Jawish

1979-01-01

427

Your Personal Genie in the Cable.  

ERIC Educational Resources Information Center

The technology necessary for the use of cable television (TV) has been invented; it simply must be put to use. By the 1970's, cable TV should be commonplace in this country. Its rapid growth was caused in part by its appearance at a time of explosive expansion of related technologies like data theory and computer design. The coaxial cable system…

Schlafly, Hubert J.

428

Lightning Shielding of Plastic Telephone Cable  

Microsoft Academic Search

Data are presented on the surge characteristics of various types and combinations of metals when applied as a shield for buried telephone cables. Surge currents were applied to the shield of 500-foot lengths of cable and the potentials developed between the shield and conductors were measured at selected points along the cable length in order to determine relative susceptibility to

E. Fisher; W. Bishop

1970-01-01

429

High power cable with internal water cooling  

Microsoft Academic Search

The transmission capacity of conventional cables will not be sufficient for the increasing requirements of electrical energy. For this reason in the 110kV-range an high power cable with internal water cooling was developed. The development included the construction of the cable components as well as that of the sealing ends and of the joints, furthermore all necessary auxiliary equipment. By

D. Hotz; R. D. Steckel; E. Zimmermann

1977-01-01

430

Nuclear electromagnetic pulse (NEMP) hardened cables  

Microsoft Academic Search

Energy from a Nuclear Electromagnetic Pulse (NEMP) couples into a system via the interconnecting cables. Calculations of the current induced on the sheath of a horizontal cable above a ground plane are discussed. These currents on the exterior of the sheath then excite the interior of the cable via the surface transfer impedance (Z sub T). The objective of reducing

W. C. Wells; Y. Shiau

1976-01-01

431

What Do We Know about the Audience for Cable Television? A Uses and Gratifications Analysis of Cable Decliners, Basic Cable Subscribers, and Pay Cable Subscribers.  

ERIC Educational Resources Information Center

How do cable television subscribers differ from those who choose not to subscribe to cable? A study employed the uses and gratification paradigm to construct a questionnaire that solicited data from 600 television households in the Dayton, Ohio market. The sample was stratified to assure that one-third of the households had cable available but…

Bradbury, David E., Jr.; Felsenthal, Norman A.

432

47 CFR 32.2421 - Aerial cable.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 false Aerial cable. 32.2421 Section 32.2421...Balance Sheet Accounts § 32.2421 Aerial cable. (a) This account shall include the original cost of aerial cable and of drop and block wires...

2013-10-01

433

30 CFR 18.45 - Cable reels.  

Code of Federal Regulations, 2013 CFR

...self-propelled machine, that receives electrical energy through a portable cable and is designed...or electrically driven reel upon which to wind the portable cable. (b) The enclosure...of a circuit for transmitting electrical energy. (d) Cable reels for shuttle...

2013-07-01

434

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

435

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

436

Active self-healing wire insulation  

NASA Astrophysics Data System (ADS)

Electrical, optical and hydraulic conductors are vital components of most modern engineered systems. Damage to wiring and other conductors can degrade system performance, require expensive maintenance, and may cause catastrophic failures. This paper describes some efforts at developing active methods for self-healing wiring and conductor insulation. The concept is that there may be situations where it is beneficial to use self-healing cabling. One-part and two-part self-healing systems are fabricated and tested. Localized toughening in the face of localized damage has been realized in bench top experiments.

Esser, B.; Huston, D.; Spencer, G.; Burns, D.; Kahn, E.

2005-05-01

437

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

438

Sound Insulation in Buildings  

NASA Astrophysics Data System (ADS)

Sound insulation between the different rooms inside a building or to the outside is a very complex problem. First, the airborne sound insulation of ceilings, walls, doors and windows is important. Second, a sufficient structure-borne sound insulation, also called impact sound insulation, for the ceilings, has to be provided especially. Finally, the service equipment should be sufficiently quiet.

Gösele, K.; Schröder, E.

439

Multiple density layered insulator  

DOEpatents

A multiple density layered insulator for use with a laser is disclosed which 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. 4 figs.

Alger, T.W.

1994-09-06

440

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

441

Properties of cryogenic insulants  

Microsoft Academic Search

High vacuum, cold gases and liquids, and solids are the principal insulating materials for superconducting apparatus. All these insulants have been claimed to show fairly good intrinsic dielectric performance under laboratory conditions where small scale experiments in the short term range are typical. However, the insulants must be integrated into large scaled insulating systems which must withstand any particular stressing

J. Gerhold

1998-01-01

442

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.

University Of Houston

443

7 CFR 1728.204 - Electric standards and specifications for materials and construction.  

...Agriculture's (USDA), hereinafter referred to as the Agency. EPR Insulating Compound is a mixture of ethylene propylene base resin and selected ingredients. TR-XLPE Insulating Compound is a tree retardant crosslinked polyethylene (TR-XLPE)...

2014-01-01

444

Solid state safety jumper cables  

Microsoft Academic Search

This invention consists of solid state jumper cables for connecting two batteries in parallel, having two bridge rectifiers for developing a reference voltage, a four-input decoder for determining which terminals are to be connected based on a comparison of the voltage at each of the four terminals to the reference voltage, and a pair of relays for effecting the correct

Kronberg

1991-01-01

445

Solid state safety jumper cables  

Microsoft Academic Search

Solid state jumper cables for connecting two batteries in parallel, having two bridge rectifiers for developing a reference voltage, a four-input decoder for determining which terminals are to be connected based on a comparison of the voltage at each of the four terminals to the reference voltage, and a pair of relays for effecting the correct connection depending on the

Kronberg

1993-01-01

446

Perceptions of Cable Public Access.  

ERIC Educational Resources Information Center

Members of the local community should be aware of public access channels on cable television systems, yet large segments of the public are unaware that they exist. To determine how the medium was perceived in the Milwaukee, Wisconsin area, a study surveyed 226 individuals by telephone, asking if they were aware of public or community access on…

Banks, Mark J.; Porter, Gregory S.

447

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

448

Cable Communications and Social Services.  

ERIC Educational Resources Information Center

Some of the ways in which cable communications may affect society's ability to help individuals who, in one way or another, are less fortunate than most are explored. The services contemplated here include job training and placement, family counseling, rehabilitation, and home management assistance. The proposed audience would include those who…

Alfred P. Sloan Foundation, New York, NY.

449

The study on stress-cone based on HTS cable terminal  

NASA Astrophysics Data System (ADS)

Our research aims at improving the performance of 35 kV class stress-cone for HTS cable terminal. Firstly, the equivalent circuit model of a stress-cone is constructed for simulation. The relation between the sag voltage of each layer can be characterized by structural and material parameters, such as the stress-cone’s plate length, plate radius, insulating material thickness and dielectric constant. Secondly, the simulation based on ANSYS is developed for analyzing the electric field of stress cone of HTS cable terminal, by altering the length of step and insulation material parameter of stress cone, we get the voltage of each plate layer, horizontal electric field and vertical electric field, and the influence of stress-cone parameter on stress cone electric field is analyzed.

Wu, C. Y.; Fang, J.; Huang, X. H.; Lu, W. J.; Li, D.; Guo, L. J.

2013-01-01

450

Superheated-steam test of ethylene propylene rubber cables using a simultaneous aging and accident environment  

SciTech Connect

The superheated-steam test exposed different ethylene propylene rubber (EPR) cables and insulation specimens to simultaneous aging and a 21-day simultaneous accident environment. In addition, some insulation specimens were exposed to five different aging conditions prior to the 21-day simultaneous accident simulation. The purpose of this superheated-steam test (a follow-on to the saturated-steam tests (NUREG/CR-3538)) was to: (1) examine electrical degradation of different configurations of EPR cables; (2) investigate differences between using superheated-steam or saturated-steam at the start of an accident simulation; (3) determine whether the aging technique used in the saturated-steam test induced artificial degradation; and (4) identify the constituents in EPR that affect moisture absorption.

Bennett, P.R.; St. Clair, S.D.; Gilmore, T.W.

1986-06-01

451

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

452

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

453

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

454

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

455

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

456

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

457

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

458

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

459

Testing flat-conductor cable  

NASA Technical Reports Server (NTRS)

Report describes characteristics of type of FCC which consists of three AWG No. 12 flat copper conductors laminated between two films of polyethylene terephthalate (Mylar) insulation with self-extinguishing polyester adhesive.

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

1976-01-01

460

Test plan and report for Space Shuttle launch environment testing of Bergen cable technology safety cable  

NASA Technical Reports Server (NTRS)

Bergen Cable Technology (BCT) has introduced a new product they refer to as 'safety cable'. This product is intended as a replacement for lockwire when installed per Aerospace Standard (AS) 4536 (included in Appendix D of this document). Installation of safety cable is reportedly faster and more uniform than lockwire. NASA/GSFC proposes to use this safety cable in Shuttle Small Payloads Project (SSPP) applications on upcoming Shuttle missions. To assure that BCT safety cable will provide positive locking of fasteners equivalent to lockwire, the SSPP will conduct vibration and pull tests of the safety cable.

Ralph, John

1992-01-01

461

Bidirectional fiber optic cable adapter  

NASA Astrophysics Data System (ADS)

The technical objective of the BIFOCS program was to develop, build, and test a full-duplex single fiber, fiber optic link, operating in the 1.0 micron to 1.6 micron region, capable of transmitting 20 Mb/s data (10 to the -9th power BER) over a range of at least 10 km, with a goal of 15 km. The link MTBF goal was 5 X 10 to the 3rd power hours and operation over a temperature range of 0 to 50 C. The fiber optic cable consisted of sections not exceeding 2 km in length joined by commercially available dry fiber optic connectors. The system performed successfully at ambient temperature over 15 km of cable.

Linehan, M.; Gee, N. B.; Taylor, R.

1983-02-01

462

Tubing and cable cutting tool  

NASA Technical Reports Server (NTRS)

A hand held hydraulic cutting tool was developed which is particularly useful in deactivating ejection seats in military aircraft rescue operations. The tool consists primarily of a hydraulic system composed of a fluid reservoir, a pumping piston, and an actuator piston. Mechanical cutting jaws are attached to the actuator piston rod. The hydraulic system is controlled by a pump handle. As the pump handle is operated the actuator piston rod is forced outward and thus the cutting jaws are forced together. The frame of the device is a flexible metal tubing which permits easy positioning of the tool cutting jaws in remote and normally inaccessible locations. Bifurcated cutting edges ensure removal of a section of the tubing or cable to thereby reduce the possibility of accidental reactivation of the tubing or cable being severed.

Mcsmith, D. D.; Richardson, J. I. (inventors)

1984-01-01

463

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

464

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

465

Transport characteristics of the 100 m KEPCO HTS cable system for balanced three-phase currents  

NASA Astrophysics Data System (ADS)

Since a 100 m, 22.9 kV/50 MVA high temperature superconductor (HTS) cable system was installed at the Gochang test yard of Korea Electric Power Corp. (KEPCO) in 2005, a long-term test has been performed. In this paper, the transport characteristics of the KEPCO HTS cable system were examined by the electrical and calorimetric methods. To analyze the shield current in this system, an equivalent circuit model for the KEPCO HTS cable was suggested, and the calculated shield current compared with the measured one. The results show that the electrically measured total loss, which includes the AC and ohmic losses, corresponds well with the loss measured from the calorimetric method. The measured AC loss of the HTS cable is proportional to the 2.5th power of transport current, and four times larger than the conductor loss calculated from the monoblock model. This is because the conductor’s geometry in the HTS cable is not identical to a cylindrical superconductor in the monoblock model, its temperature rises due to a thick insulator, and the shield loss is included in the measured AC loss. In addition, the measured AC resistance of the current-lead is constant regardless of transport current, particularly in the low current region. Finally, the shield current calculated from our equivalent circuit model is in good agreement with the measured one.

Li, Z. Y.; Ma, Y. H.; Choi, B. J.; Ryu, K.; Sohn, S. H.; Hwang, S. D.

2010-11-01

466

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

467

Modeling and Filter Design for Overvoltage Mitigation in a Motor Drive System with a Long Cable  

NASA Astrophysics Data System (ADS)

This paper presents an intensive discussion on modeling an adjustable-speed motor drive system consisting of a voltage-source PWM inverter and an induction motor that are connected by a three-phase symmetric, long cable with a grounding wire lead. Then, it describes a design procedure for a parallel-connected R-L filter in each phase that can mitigate the overvoltage appearing at the motor terminals. The model developed in this paper focuses on the inherent “ringing frequency” of the cable, where the ringing frequency is inversely proportional to cable length. When no filter is used, the so-called “impedance mismatch” causes the reflection of a voltage-traveling wave at both the inverter and the motor terminals. As a result, the impedance mismatch generates an overvoltage that may reach twice the inverter dc-link voltage at the motor terminals. The overvoltage may damage the motor-winding insulation, and may cause it to breakdown. Although an R-L filter installed on the ac side of the inverter can reduce the overvoltage, it would be difficult to design the filter effectively for long cables of different lengths. The effectiveness and validity of the simple design procedure described in this paper are confirmed on a 400-V, 15-kW experimental system with either a 100-m or 200-m-long cable.

Matsumura, Itaru; Akagi, Hirofumi

468

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

469

Silica reusable surface insulation  

NASA Technical Reports Server (NTRS)

A reusable silica surface insulation material is provided by bonding amorphous silica fibers with colloidal silica at an elevated temperature. The surface insulation is ordinarily manufactured in the form of blocks (i.e., tiles).

Goldstein, H. E.; Smith, M.; Leiser, D. B. (inventors)

1976-01-01

470

Insulation for Piping.  

National Technical Information Service (NTIS)

A foamed insulation for cryogenic pipe lines comprised of a pair of preformed, semicircular foamed insulation half-sections is described. The faying surfaces are coated with a polyurethane adhesive and bonded together about the pipe. The faying surfaces o...

G. Lerma

1975-01-01

471

Foam Thermal Insulation.  

National Technical Information Service (NTIS)

The report covers the testing of two different types of foam thermal insulation materials using certain proprietary coatings. The purpose of these tests was to determine the suitability of these materials as thermal insulation for shipboard construction c...

R. E. Buzhardt

1967-01-01

472

7 CFR 1755.903 - Fiber optic service entrance cables.  

Code of Federal Regulations, 2010 CFR

...characterization cable lengths. If the ship length of cable is less than...cable) before cutting to the ship lengths of cable may be applied to the ship lengths. (5) Attenuation...manufactured must meet the âCable Low and High Temperature Bend...

2010-01-01

473

Statistical topological insulators  

NASA Astrophysics Data System (ADS)

We define a class of insulators with gapless surface states protected from localization due to the statistical properties of a disordered ensemble, namely, due to the ensemble's invariance under a certain symmetry. We show that these insulators are topological, and are protected by a Z2 invariant. Finally, we prove that every topological insulator gives rise to an infinite number of classes of statistical topological insulators in higher dimensions. Our conclusions are confirmed by numerical simulations.

Fulga, I. C.; van Heck, B.; Edge, J. M.; Akhmerov, A. R.

2014-04-01

474

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

475

Cable Vibration Control using Magnetorheological Dampers  

Microsoft Academic Search

As the world's first implementation of magnetorheological (MR) smart damping technique in bridge structures, a total of 312 semi-active MR dampers (RD-1005, Lord Corporation) have recently been installed for rain–wind-induced cable vibration control on the cable-stayed Dongting Lake Bridge, China. This project has undergone several stages of in situ experiments and tests: (i) modal tests of undamped cables, (ii) forced

Y. F. Duan; Y. Q. Ni; J. M. Ko

2006-01-01

476

Cable Suspended Robots: Design, Planning and Control  

Microsoft Academic Search

Cable-suspended robots are structurally similar to parallel actuated robots, but with the fundamental difference that cables can only pull the end-effector but not push it. This feature makes the design, planning and control of cable-suspended robots a lot more challenging compared to their counterparts - parallel-actuated robots. This paper describes the kinematic and dynamic models, work-space, trajectory planning, and feedback

Abdullah B. Alp; Sunil Kumar Agrawal

2002-01-01

477

Insulated exhaust cover  

Microsoft Academic Search

This patent describes a device for insulating one or more pipes in the exhaust system of an internal combustion engine. It comprises: a layer of insulating material circumscribingly engaging the outer surface of the exhaust pipe, a flexible metal sleeve defining an elongated passageway having a diameter, a means for retaining the insulating material and the metal sleeve in stationary

1992-01-01

478

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) [Corvallis, OR

1995-01-01

479

Numerical prediction of EMI on the secondary DC cable in cable tunnel due to a direct lightning strike in substation  

Microsoft Academic Search

Electromagnetic interference (EMI) on secondary dc cable in cable tunnel due to a direct lightning strike in substation threatens the safe operation of electronic equipment and system connected to the cable. In order to reduce EMI, the cable shield is generally connected to the grounding grid at both ends. Ground potential difference between two grounding points of the cable shield

Lei Qi; Cui Xiang

2006-01-01

480

Study of Kapton insulated superconducting coils manufactured for the LHC inner triplet model magnets at Fermilab  

Microsoft Academic Search

Fermilab has constructed a number of 2 m model quadrupoles as part of an ongoing program to develop and optimize the design of quadrupoles for the LHC Interaction Region inner triplets. The quadrupole design is based upon a two layer shell type coil of multi-filament NbTi strands in Rutherford cable, insulated with Kapton film. As such, the coil size and

N. Andreev; T. Arkan; R. Bossert; J. Brandt; D. R. Chichili; J. Kerby; A. Nobrega; I. Novitski; J. Ozelis; S. Yadav; A. V. Zlobin

2000-01-01

481

On the Cable; The Television of Abundance. Report of the Sloan Commission on Cable Communications.  

ERIC Educational Resources Information Center

The Sloan Commission report on cable television surveys the history and technology of cable television and suggests the prospects and possibilities the medium offers to the American public. The possible impact of cable television on over-the-air television is projected, and the possible shape of entertainment, news and opinion, public services,…

Alfred P. Sloan Foundation, New York, NY.

482

Vortex-induced cable vibration of cable-stayed bridges at high reduced wind velocity  

Microsoft Academic Search

In this paper, mechanisms of vortex-induced vibration of inclined cables at high reduced wind velocity region are discussed using results from a series of wind tunnel tests. As a conclusion, this aerodynamic instability of inclined cables would occur by the fluid interaction between Karman vortex and axial vortex. Also, the axial flow along the cable axis and the upper water

Masaru Matsumoto; Tomomi Yagi; Yoshinori Shigemura; Daisuke Tsushima

2001-01-01

483

Cubic Topological Kondo Insulators  

NASA Astrophysics Data System (ADS)

Current theories of Kondo insulators employ the interaction of conduction electrons with localized Kramers doublets originating from a tetragonal crystalline environment, yet all Kondo insulators are cubic. Here we develop a theory of cubic topological Kondo insulators involving the interaction of ?8 spin quartets with a conduction sea. The spin quartets greatly increase the potential for strong topological insulators, entirely eliminating the weak topological phases from the diagram. We show that the relevant topological behavior in cubic Kondo insulators can only reside at the lower symmetry X or M points in the Brillouin zone, leading to three Dirac cones with heavy quasiparticles.

Alexandrov, Victor; Dzero, Maxim; Coleman, Piers

2013-11-01

484

Nuclear power plant cable materials : review of qualification and currently available aging data for margin assessments in cable performance.  

SciTech Connect

A selective literature review was conducted to assess whether currently available accelerated aging and original qualification data could be used to establish operational margins for the continued use of cable insulation and jacketing materials in nuclear power plant environments. The materials are subject to chemical and physical degradation under extended radiationthermal- oxidative conditions. Of particular interest were the circumstances under which existing aging data could be used to predict whether aged materials should pass loss of coolant accident (LOCA) performance requirements. Original LOCA qualification testing usually involved accelerated aging simulations of the 40-year expected ambient aging conditions followed by a LOCA simulation. The accelerated aging simulations were conducted under rapid accelerated aging conditions that did not account for many of the known limitations in accelerated polymer aging and therefore did not correctly simulate actual aging conditions. These highly accelerated aging conditions resulted in insulation materials with mostlyinert' aging processes as well as jacket materials where oxidative damage dropped quickly away from the air-exposed outside jacket surface. Therefore, for most LOCA performance predictions, testing appears to have relied upon heterogeneous aging behavior with oxidation often limited to the exterior of the cable cross-section - a situation which is not comparable with the nearly homogenous oxidative aging that will occur over decades under low dose rate and low temperature plant conditions. The historical aging conditions are therefore insufficient to determine with reasonable confidence the remaining operational margins for these materials. This does not necessarily imply that the existing 40-year-old materials would fail if LOCA conditions occurred, but rather that unambiguous statements about the current aging state and anticipated LOCA performance cannot be provided based on original qualification testing data alone. The non-availability of conclusive predictions for the aging conditions of 40-year-old cables implies that the same levels of uncertainty will remain for any re-qualification or extended operation of these cables. The highly variable aging behavior of the range of materials employed also implies that simple, standardized aging tests are not sufficient to provide the required aging data and performance predictions for all materials. It is recommended that focused studies be conducted that would yield the material aging parameters needed to predict aging behaviors under low dose, low temperature plant equivalent conditions and that appropriately aged specimens be prepared that would mimic oxidatively-aged 40- to 60- year-old materials for confirmatory LOCA performance testing. This study concludes that it is not sufficient to expose materials to rapid, high radiation and high temperature levels with subsequent LOCA qualification testing in order to predictively quantify safety margins of existing infrastructure with regard to LOCA performance. We need to better understand how cable jacketing and insulation materials have degraded over decades of power plant operation and how this aging history relates to service life prediction and the performance of existing equipment to withstand a LOCA situation.

Celina, Mathias Christopher; Gillen, Kenneth Todd; Lindgren, Eric Richard

2013-05-01

485

47 CFR 76.614 - Cable television system regular monitoring.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 false Cable television system regular monitoring. 76.614...SERVICES MULTICHANNEL VIDEO AND CABLE TELEVISION SERVICE Technical Standards § 76.614 Cable television system regular...

2013-10-01

486

47 CFR 76.403 - Cable television system reports.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 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...

2013-10-01

487

47 CFR 32.6421 - Aerial cable expense.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 false Aerial cable expense. 32.6421 Section...for Expense Accounts § 32.6421 Aerial cable expense. (a) This account shall include expenses associated with aerial cable. (b) Subsidiary...

2013-10-01

488

77 FR 61351 - Cable Television Technical and Operational Requirements  

Federal Register 2010, 2011, 2012, 2013

...receive good quality signals. When the Commission adopted technical rules in the 1990s, digital cable service was in its infancy, and therefore the rules were adopted with analog cable service in mind. Today, digital cable service is...

2012-10-09

489

Load Excitation at the Superconducting Cable Test Facility.  

National Technical Information Service (NTIS)

The superconducting cable test facility was constructed to evaluate and demonstrate flexible superconducting power transmission cables under realistic conditions. Power supplies were installed to excite two superconducting cables either separately or simu...

E. B. Forsyth A. J. McNerney M. Meth

1979-01-01

490

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

491

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

492

A New Multiconstraint Method for Determining the Optimal Cable Stresses in Cable-Stayed Bridges  

PubMed Central

Cable-stayed bridges are one of the most popular types of long-span bridges. The structural behaviour of cable-stayed bridges is sensitive to the load distribution between the girder, pylons, and cables. The determination of pretensioning cable stresses is critical in the cable-stayed bridge design procedure. By finding the optimum stresses in cables, the load and moment distribution of the bridge can be improved. In recent years, different research works have studied iterative and modern methods to find optimum stresses of cables. However, most of the proposed methods have limitations in optimising the structural performance of cable-stayed bridges. This paper presents a multiconstraint optimisation method to specify the optimum cable forces in cable-stayed bridges. The proposed optimisation method produces less bending moments and stresses in the bridge members and requires shorter simulation time than other proposed methods. The results of comparative study show that the proposed method is more successful in restricting the deck and pylon displacements and providing uniform deck moment distribution than unit load method (ULM). The final design of cable-stayed bridges can be optimised considerably through proposed multiconstraint optimisation method.

Asgari, B.; Osman, S. A.; Adnan, A.

2014-01-01

493

Recent evolution of cable-stayed bridges  

Microsoft Academic Search

This paper aims to provide evidence of the rapid progress in cable-stayed bridges. The span record progressed rapidly during the last 10 years, passing from 465 to almost 900m; it is now expected that 1200m will be reached soon, if care is taken with regard to aerodynamic stability and dynamic response to turbulent wind, which can be now mastered. Cable

Michel Virlogeux

1999-01-01

494

Wind Induced Vibration of Stay Cables.  

National Technical Information Service (NTIS)

Cable-stayed bridges have become the form of choice over the past several decades for bridges in the medium to long span range. In come cases serviceability problems involving large amplitude vibrations of stay cables under certain wind and rain condition...

S. Kumarasena N. P. Jones P. Irwin P. Taylor

2005-01-01

495

Arc tracking of cables for space applications  

NASA Technical Reports Server (NTRS)

The main objective of this study is to develop a new test method that is suitable for the assessment of the resistance of aerospace cables to arc tracking for different specific environmental and network conditions of spacecrafts. This paper reports the purpose, test conditions, test specimen, test procedure, and test acceptance criteria of seven different (200-250 mm long) cables.

Koenig, D.; Frontzek, F. R.; Hanson, J.; Reher, H. J.; Judd, M. D.; Bryant, D.

1995-01-01

496

Cable in Boston; A Basic Viability Report.  

ERIC Educational Resources Information Center

The viability of urban cable television (CATV) as an economic phenomenon is examined via a case study of its feasibility in Boston, a microcosm of general urban environment. To clarify cable's economics, a unitary concept of viability is used in which all local characteristics, cost assumptions, and growth estimates are structured dynamically as a…

Hauben, Jan Ward; And Others

497

First Russian long length HTS power cable  

NASA Astrophysics Data System (ADS)

The Russian R&D Program for superconducting power devices is underway, supported both by government and electric power companies. In this program R&D on HTS power cables is considered as most advanced and close to commercialization. In the framework of the program, several, heavily instrumented, 5 m cables have been tested following by the 30 m - 3 phase experimental power cable development and testing in 2008-2009. The latest achievement is development and testing of the first long length 3 × 200 m power cable with rating 1.5/2 kA-20 kV. In parallel with just the cable development the innovative cryogenic system has been developed as well for the cable cooling. The system is using neon as working substance and radial turbo-machines in refrigerator. Cooling power is up to ?8 kW at 65 K, inter-maintenance time ?30,000 h. The cryogenic pump with superconducting motor can be used to provide subcooled liquid nitrogen flow ?0.1-1.5 kg/s at 0.1-2.5 MPa pressure. After extensive tests at special test facility, HTS power cable and cryogenic system are planning to be installed at some substation in Moscow utility grid. In this review some details about Russian HTS power application program, 200 m cable and cryogenic system designs and tests results are presented.

Volkov, Eduard P.; Vysotsky, Vitaly S.; Firsov, Valery P.

2012-11-01

498

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

499

Nuclear Electromagnetic Pulse (NEMP) Hardened Cables.  

National Technical Information Service (NTIS)

Energy from a Nuclear Electromagnetic Pulse (NEMP) couples into a system via the interconnecting cables. Calculations of the current induced on the sheath of a horizontal cable above a ground plane are discussed. These currents on the exterior of the shea...

W. C. Wells Y. Shiau

1976-01-01

500

Nuclear electromagnetic pulse (NEMP) hardened cables  

Microsoft Academic Search

When a system is exposed to a Nuclear Electromagnetic Pulse (NEMP), the cables which are used to connect the components act as antennas and couple NEMP energy into the system. The purpose of the program is to develop shields for a 26-pair communications cable which will significantly reduce the NEMP pickup. Because of the technical approach employed, however, many results

W. C. Wells

1975-01-01