Sample records for xlpe cable insulation

  1. Insulation monitoring system for XLPE cable containing water sensor and optical fiber

    Microsoft Academic Search

    M. Aihara; Y. Ebinuma; M. Minami; M. Murakawa

    1991-01-01

    An all-purpose insulation monitoring system for XLPE (cross-linked polyethylene) cables in hot line has been developed. The system measures the dielectric dissipation factor and DC component of charging current, i.e., the two factors which are attracting much attention for evaluation of cable insulation in hot line, and detects water penetration and longitudinal temperature distribution in the cable. Water penetration and

  2. Effect of tree channel conductivity on electrical tree shape and breakdown in XLPE cable insulation samples

    Microsoft Academic Search

    Xiangrong Chen; Yang Xu; Xiaolong Cao; S. J. Dodd; L. A. Dissado

    2011-01-01

    The results of an investigation into electrical tree growth in XLPE cable insulation using an embedded needle electrode are reported for a range of voltages from 9 kV rms to 27 kV rms. The partial discharge (PD) activity and tree structures were measured simultaneously throughout the tree growth and the trees were recorded from initiation up to and including the

  3. Morphology of novel XLPE cable systems

    Microsoft Academic Search

    I. L. Hosier; A. S. Vaughan; A. Campus; U. Nilsson

    2007-01-01

    Crosslinked polyethylene (XLPE) insulated cables are used widely for the transmission and distribution of electrical power. Although XLPE has many desirable characteristics, the addition of other polymers constitutes one way in which properties can be modified to suit particular applications. This paper describes a modified permanganic etching technique that has been optimized to permit the study of such systems by

  4. Thermal analysis for determination of current carrying capacity of PE and XLPE insulated power cables using finite element method

    Microsoft Academic Search

    I. Kocar; A. Ertas

    2004-01-01

    Transient heat transfer analysis of medium voltage, PE and XLPE insulated underground power cables are investigated by applying finite element modeling developed under a finite element software utilizing principle of virtual temperatures which is the quadratic functional form of the variational formulation of the transient heat transfer equation. Obtained results are compared with and verified by experimental heat transfer data

  5. Space charge behavior in XLPE cable insulation under 0.2-1.2 MV\\/cm dc fields

    Microsoft Academic Search

    N. Hozumi; T. Takeda; H. Suzuki; T. Okamoto

    1998-01-01

    This report deals with space charge behavior in PE (polyethylene) under dc fields. Direct observation of time-dependent space charge profiles in 3-mm thick XLPE (crosslinked low-density polyethylene) cable insulation under dc electric fields was performed using the pulsed electroacoustic method. Stable hetero charges were formed when the field was as low as 0.2 MV\\/cm, and intermittent generation of packet shaped

  6. The characteristics of electrical trees in the inner and outer layers of different voltage rating XLPE cable insulation

    NASA Astrophysics Data System (ADS)

    Xie, Ansheng; Li, Shengtao; Zheng, Xiaoquan; Chen, George

    2009-06-01

    The statistical initiation and propagation characteristics of electrical trees in cross-linked polyethylene (XLPE) cables with different voltage ratings from 66 to 500 kV were investigated under a constant test voltage of 50 Hz/7 kV (the 66 kV rating cable is from UK, the others from China). It was found that the characteristics of electrical trees in the inner region of 66 kV cable insulation differed considerably from those in the outer region under the same test conditions; however, no significant differences appeared in the 110 kV rating cable and above. The initiation time of electrical trees in both the inner and the outer regions of the 66 kV cable is much shorter than that in higher voltage rating cables; in addition the growth rate of electrical trees in the 66 kV cable is much larger than that in the higher voltage rating cables. By using x-ray diffraction, differential scanning calorimetry and thermogravimetry methods, it was revealed that besides the extrusion process, the molecular weight of base polymer material and its distribution are the prime factors deciding the crystallization state. The crystallization state and the impurity content are responsible for the resistance to electrical trees. Furthermore, it was proposed that big spherulites will cooperate with high impurity content in enhancing the initiation and growth processes of electrical trees via the 'synergetic effect'. Finally, dense and small spherulites, high crystallinity, high purity level of base polymer material and super-clean production processes are desirable for higher voltage rating cables.

  7. Improvement of the return voltage method for water tree detection in XLPE cables

    Microsoft Academic Search

    Rainer Patsch; Jochen Jung

    2000-01-01

    The return voltage method is a well established diagnostic technique to determine the condition of insulation systems e.g. transformers, mass impregnated cables or XLPE cables. Commonly used parameters to assess the insulation condition from a return voltage measurement are the maximum value, the initial slope and the time of the return voltage peak. Compared to other dielectric diagnostic techniques in

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

    Microsoft Academic Search

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

    1994-01-01

    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

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

    NASA Astrophysics Data System (ADS)

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

    2006-03-01

    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.

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

    NASA Astrophysics Data System (ADS)

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

    1988-09-01

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

  11. Analysis of the XLPE Insulation of Distribution Covered Conductors in Brazil

    NASA Astrophysics Data System (ADS)

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

    2014-03-01

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

  12. Space charge distribution measurement in a long size XLPE cable using the pulsed electroacoustic method

    Microsoft Academic Search

    Naohiro Hozumi; Tatsuki Okamoto; Takahisa Imajo

    1992-01-01

    The authors describe a space charge measurement technique for a long XLPE cable specimen. The length of the cable specimen has been limited in conventional methods, because of the problem of pulse propagation through the cable. The problem was overcome by using the pulsed electroacoustic method, and also by applying the pulse voltage at the outer shield where the piezoelectric

  13. Polarization and charge trapping in cross-linked polyethylene (XLPE) cables AC aged in humid environment

    Microsoft Academic Search

    A. Svatik; P. C. N. Scarpa; D. K. Das-Gupta; D. E. Cooper

    1992-01-01

    The authors report the results of TSDC (thermally stimulated discharge current) and TTC measurements of XLPE (cross-linked polyethylene) cables AC aged in water for a period up to 4000 h. Absorption and resorption current measurements were also performed during the aging to get more information about the penetration of water and ions into the cable. The results suggest that initially

  14. Condition assessment of cable insulation systems in operating nuclear power plants

    Microsoft Academic Search

    K. Anandakumaran; W. Seidl; P. V. Castaldo

    1999-01-01

    Four crosslinked polyethylene (XLPE) and ethylene propylene rubber (EPR) insulated cables were subjected to accelerated thermal, radiation, and sequential radiation and thermal exposure to simulate 20, 30, and 40 yr in-service environments in Ontario Hydro Nuclear Plants. Two sets of samples were evaluated. The first set contained 15 cm cable specimens in tubular form with the conductors removed, while the

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

    SciTech Connect

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

    1995-10-01

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

  16. Characterizing HV XLPE cables by electrical, chemical and microstructural measurements on cable peeling: effects of surface roughness, thermal treatment and peeling location

    Microsoft Academic Search

    L. A. Dissado; J. C. Fothergill; A. See; G. C. Stevens; L. Markey; C. Laurent; G. Teyssedre; U. H. Nilsson; G. Platbrood; G. C. Montanari

    2000-01-01

    Characterization of the electrical, chemical, and microstructural properties of high voltage cables was the first step of the European project “ARTEMIS”, which has the aim of investigating degradation processes and constructing aging models for the diagnosis of cross-linked polyethylene (XLPE) cables. Cables produced by two different manufacturers were subjected to a large number of electrical, microstructural, and chemical characterizations, using

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

    SciTech Connect

    Eager, G.S. Jr.; Seman, G.W.; Fryszczyn, B.

    1995-11-01

    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 operating voltage stresses of crosslinked polyethylene insulated cables that become wet when they operate in a moist environment. The present report covers the measurement of the threshold voltage, the a.c. breakdown voltage and the impulse breakdown voltage of XLPE cable after undergoing accelerated laboratory aging in water. Model and 15 kV XLPE cables were manufactured in commercial equipment using state-of-the-art semiconducting shields and XLPE insulation. The threshold voltage, a.c. voltage breakdown and impulse voltage breakdown of the model cables were determined before aging, after aging one week and after aging 26 weeks. The model cable, following 26 weeks aging, was dried by passing dry gas through the conductor interstices which removed moisture from the cable. The threshold voltage, the a.c. voltage breakdown and the impulse voltage breakdown of the XLPE model cable after drying was measured.

  18. Fully synthetic taped insulation cables

    DOEpatents

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

    1984-01-01

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

  19. Electrical conduction of a XLPE nanocomposite

    NASA Astrophysics Data System (ADS)

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

    2014-07-01

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

  20. Fully synthetic taped insulation cables

    DOEpatents

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

    1983-07-15

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

  1. Space charge in XLPE power cable under dc electrical stress and heat treatment

    Microsoft Academic Search

    Xinsheng Wang; Demin Tu; Y. Tanaka; T. Muronaka; T. Takada; C. Shinoda; T. Hashizumi

    1995-01-01

    It is well known that the existence and accumulation of space charge in insulation can be harmful to polymer power cable. Although there is much research done on space charge distribution in various samples, there are still some important problems left unsolved, such as the mechanism of formation and elimination of space charge in dielectrics. Because of its superiority, the

  2. 6.6kV XLPE submarine cable with optical fiber sensors to detect anchor damage and defacement of wire armor

    SciTech Connect

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

    1995-10-01

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

  3. Microvoids in crosslinked polyethylene insulated cables

    Microsoft Academic Search

    S. Kageyama; M. Ono; S. Chabata

    1975-01-01

    This paper explains the main. cause of the formation of microvoids (1µm-several 10sµm) in the insulation of crosslinked polyethylene, and the effect of those on the electrial characteristics of cable. Crosslinked polyethylene cable is produced through the process of extruding, moulding, heating, crosslinking and cooling. Steam is usually used as the heating medium. The first cause of the formation of

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

    SciTech Connect

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

    1995-07-01

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

  5. Development of radiation resistant electrical cable insulations

    NASA Technical Reports Server (NTRS)

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

    1994-01-01

    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.

  6. 46 CFR 111.60-21 - Cable insulation tests.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

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

  7. 46 CFR 111.60-21 - Cable insulation tests.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

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

  8. 46 CFR 111.60-21 - Cable insulation tests.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

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

  9. 46 CFR 111.60-21 - Cable insulation tests.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 2011-10-01 false Cable insulation tests. 111.60-21 Section 111...and Methods § 111.60-21 Cable insulation tests. All cable for electric power...equipment must be checked for proper insulation resistance to ground and between...

  10. Improved cable insulation for superconducting magnets

    SciTech Connect

    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

    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.

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

    E-print Network

    Ritchie, Robert

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

  12. 30 CFR 75.516-2 - Communication wires and cables; installation; insulation; support.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

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

  13. 30 CFR 75.516-2 - Communication wires and cables; installation; insulation; support.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

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

  14. 30 CFR 75.516-2 - Communication wires and cables; installation; insulation; support.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

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

  15. 30 CFR 75.516-2 - Communication wires and cables; installation; insulation; support.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

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

  16. 30 CFR 75.516-2 - Communication wires and cables; installation; insulation; support.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

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

  17. 30 CFR 56.12008 - Insulation and fittings for power wires and cables.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

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

  18. 30 CFR 56.12008 - Insulation and fittings for power wires and cables.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

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

  19. 30 CFR 56.12008 - Insulation and fittings for power wires and cables.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

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

  20. 30 CFR 56.12008 - Insulation and fittings for power wires and cables.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

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

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

    SciTech Connect

    None

    2012-02-24

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

  2. 49 CFR 234.267 - Insulation resistance tests, wires in trunking and cables.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 2010-10-01 false Insulation resistance tests, wires in trunking...Inspections and Tests § 234.267 Insulation resistance tests, wires in trunking and cables. (a) Insulation resistance tests shall be made...

  3. 49 CFR 236.108 - Insulation resistance tests, wires in trunking and cables.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

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

  4. 49 CFR 234.267 - Insulation resistance tests, wires in trunking and cables.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

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

  5. 49 CFR 234.267 - Insulation resistance tests, wires in trunking and cables.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

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

  6. 49 CFR 236.108 - Insulation resistance tests, wires in trunking and cables.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

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

  7. 49 CFR 236.108 - Insulation resistance tests, wires in trunking and cables.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 2014-10-01 false Insulation resistance tests, wires in trunking...Tests; All Systems § 236.108 Insulation resistance tests, wires in trunking and cables. (a) Insulation resistance of wires and...

  8. 49 CFR 234.267 - Insulation resistance tests, wires in trunking and cables.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

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

  9. 49 CFR 236.108 - Insulation resistance tests, wires in trunking and cables.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

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

  10. 49 CFR 236.108 - Insulation resistance tests, wires in trunking and cables.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 2010-10-01 false Insulation resistance tests, wires in trunking...Tests; All Systems § 236.108 Insulation resistance tests, wires in trunking and cables. (a) Insulation resistance of wires and...

  11. 49 CFR 234.267 - Insulation resistance tests, wires in trunking and cables.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 2014-10-01 false Insulation resistance tests, wires in trunking...Inspections and Tests § 234.267 Insulation resistance tests, wires in trunking and cables. (a) Insulation resistance tests shall be made...

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

    Microsoft Academic Search

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

    1991-01-01

    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

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

    NASA Astrophysics Data System (ADS)

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

    2014-08-01

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

  14. Influence of thermal treatment and residues on space charge accumulation in XLPE for DC power cable application

    Microsoft Academic Search

    M. Fu; G. Chen; L. A. Dissado; J. C. Fothergill

    2007-01-01

    The effects of cross-linking by-products (residues) quantity and thermal treatment on space charge accumulation and decay in manufacturer modified XLPEs for DC power cable application have been investigated using the pulsed electro-acoustic technique. The threshold stress for space charge generation among the modified and reference XLPEs during voltage-ramping was found to show considerable variation and to depend upon the material

  15. 30 CFR 75.517-1 - Power wires and cables; insulation and protection.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

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

  16. 30 CFR 75.517-2 - Plans for insulation of existing bare power wires and cables.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 2010-07-01 false Plans for insulation of existing bare power wires and cables...Equipment-General § 75.517-2 Plans for insulation of existing bare power wires and cables...before December 31, 1970, plans for the insulation of existing bare power wires...

  17. 30 CFR 75.517-2 - Plans for insulation of existing bare power wires and cables.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 2014-07-01 false Plans for insulation of existing bare power wires and cables...Equipment-General § 75.517-2 Plans for insulation of existing bare power wires and cables...before December 31, 1970, plans for the insulation of existing bare power wires...

  18. 30 CFR 75.517-2 - Plans for insulation of existing bare power wires and cables.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 2013-07-01 false Plans for insulation of existing bare power wires and cables...Equipment-General § 75.517-2 Plans for insulation of existing bare power wires and cables...before December 31, 1970, plans for the insulation of existing bare power wires...

  19. 30 CFR 75.517-1 - Power wires and cables; insulation and protection.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

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

  20. 30 CFR 75.517-1 - Power wires and cables; insulation and protection.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

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

  1. 30 CFR 75.517-2 - Plans for insulation of existing bare power wires and cables.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 2011-07-01 false Plans for insulation of existing bare power wires and cables...Equipment-General § 75.517-2 Plans for insulation of existing bare power wires and cables...before December 31, 1970, plans for the insulation of existing bare power wires...

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

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 2012-07-01 false Plans for insulation of existing bare power wires and cables...Equipment-General § 75.517-2 Plans for insulation of existing bare power wires and cables...before December 31, 1970, plans for the insulation of existing bare power wires...

  3. 30 CFR 75.517-1 - Power wires and cables; insulation and protection.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

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

  4. 30 CFR 75.517-1 - Power wires and cables; insulation and protection.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

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

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

    Microsoft Academic Search

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

    1992-01-01

    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

  6. Studies on electrical cable insulation for nuclear applications

    SciTech Connect

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

    1989-12-01

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

  7. 30 CFR 75.517 - Power wires and cables; insulation and protection.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

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

  8. 30 CFR 75.517 - Power wires and cables; insulation and protection.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

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

  9. 30 CFR 57.12008 - Insulation and fittings for power wires and cables.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

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

  10. 30 CFR 57.12008 - Insulation and fittings for power wires and cables.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

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

  11. 30 CFR 75.517 - Power wires and cables; insulation and protection.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

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

  12. 30 CFR 75.517 - Power wires and cables; insulation and protection.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

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

  13. 30 CFR 75.517 - Power wires and cables; insulation and protection.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

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

  14. 30 CFR 57.12008 - Insulation and fittings for power wires and cables.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

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

  15. 30 CFR 56.12008 - Insulation and fittings for power wires and cables.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

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

  16. Relationships between Processing Parameters and the Foaming Performances of Polyethylene for Coaxial Cable Insulation

    Microsoft Academic Search

    Young Ho Kim; Byung Joo Jeon; Sung Woon Cha; Gi Joon Nam; Chan Yong Park; Gun Joo Lee

    2008-01-01

    Coaxial cable is cable that transmits electrical energy and signal from the receiver devices to the antenna in the base station. Nowadays, as the telecommunication technology develops, demand for a high signal quality is required in the coaxial cable. In this cable, the electromagnetic signal passes through the insulation, which is usually composed of foamed high-density polyethylene (HDPE)\\/low-density polyethylene (LDPE)

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

    Microsoft Academic Search

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

    2010-01-01

    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

  18. Radiation Resistance of XLPE Nano-dielectrics for Advanced Reactor Applications

    SciTech Connect

    Duckworth, Robert C [ORNL; Polyzos, Georgios [ORNL; Paranthaman, Mariappan Parans [ORNL; Aytug, Tolga [ORNL; Leonard, Keith J [ORNL; Sauers, Isidor [ORNL

    2014-01-01

    Recently there has been renewed interest in nuclear reactor safety, particularly as commercial reactors are approaching 40 years service and lifetime extensions are considered, as well as for new reactor building projects around the world. The materials that are currently used in cabling for instrumentation, reactor control, and communications include cross-linked polyethylene (XLPE), ethylene propylene rubber (EPR), polyvinyl chloride (PVC), neoprene, and chlorosulfonated polyethylene. While these materials show suitable radiation tolerance in laboratory tests, failures before their useful lifetime occur due to the combined environmental effects of radiation, temperature and moisture, or operation under abnormal conditions. In addition, the extended use of commercial reactors beyond their original service life places a greater demand on insulating materials to perform beyond their current ratings in these nuclear environments. Nanocomposite materials that are based on XLPE and other epoxy resins incorporating TiO2, MgO, SiO2, and Al2O3 nanoparticles are being fabricated using a novel in-situ method established at ORNL to demonstrate materials with increased resistance to radiation. As novel nanocomposite dielectric materials are developed, characterization of the non-irradiated and irradiated nanodielectrics will lead to a knowledge base that allow for dielectric materials to be engineered with specific nanoparticle additions for maximum benefit to wide-variety of radiation environments found in nuclear reactors. This paper presents the initial findings on the development of XLPE-based SiO2 nano-composite dielectrics in the context of electrical performance and radiation degradation.

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

    E-print Network

    Thomas, Zachary M. (Zachary Michael)

    2007-01-01

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

  20. 30 CFR 57.12008 - Insulation and fittings for power wires and cables.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

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

  1. 30 CFR 57.12008 - Insulation and fittings for power wires and cables.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

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

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

    Microsoft Academic Search

    S. A. Boggs

    1982-01-01

    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.

  3. Comparison of antioxidants for combined radiation and thermal aging and superposition of radiation and thermal aging for EPR and XLPE

    NASA Astrophysics Data System (ADS)

    Reynolds, A. B.; Wlodkowski, P. A.

    Thermal and combined thermal and radiation aging of low voltage EPR and XLPE cable insulation with Agerite MA antioxidant and with the ZMTI/Aminox antioxidant system was examined to compare the relative effectiveness of the antioxidant and polymer systems. All provided significant stability with no clear choice of any particular combination being superior to the others. A comparison of degradation from thermal and radiation aging with degradation from combined thermal/radiation aging showed that the damage from the individual aging effects was superposable. This indicates that synergistic effects have little importance for the EPRs and XLPEs tested under the aging conditions observed.

  4. Measurement of space charge in XLPE insulation under 50 Hz ac electric stresses using the LIPP method

    Microsoft Academic Search

    Y. F. F. Ho; G. Chen; A. E. Davies; S. G. Swingler; S. J. Sutton; R. N. Hampton; S. Hobdell

    2002-01-01

    Space charge is believed to play an important role in ac electrical ageing of polymeric insulation, particularly where electrical treeing is the dominant cause of premature failure. The majority of work to date has been on the space charge characteristics under dc electric stresses, whereas work on the dynamics and the role of space charge on electrical breakdown under 50

  5. Transition of Progressing Aspect of Negative Creeping Discharge along Aerial Insulated Cable

    NASA Astrophysics Data System (ADS)

    Nishi, Toshiyuki; Hanaoka, Ryoichi; Takata, Shinzo

    When a stroke of lightning happens in the vicinity of the outdoor high voltage distribution lines, the inductive lightning surge invades to the central line of aerial insulated cables. The creeping discharges can progress along the cable surface from the free end of the binding wire just after the flashover of the insulator at the cable supporting points. If the weak points such as the pin-holes exist in the insulated coating near the cable supporting points, the creeping discharges may give rise to a punch-through breakdown of the insulated coating and melting or snapping accidents of the cable. To prevent these disasters, it is important to clarify the mechanism of the creeping discharge phenomena along the cable surface. The negative creeping discharge along the cable surface depends on the peak value of surge voltage and its progressing process is extremely complicated. We already reported photographically the progressing aspect of the negative creeping discharge using a high-speed image converter camera. In this paper, we consider the progressing mechanism of negative creeping discharge using the discharge models which propose on the basis of the discharge photographs that have been obtained by experimental observations.

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

    Microsoft Academic Search

    Yewen Zhang; Jacques Lewiner; Claude Alquie; Nigel Hampton

    1996-01-01

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

  7. Study on the properties of the wollastonite short fiber-PVC cable insulation composition

    SciTech Connect

    Zhang Xianyou; Zhang Xiaohong [Harbin Univ. of Science and Technology (China)

    1996-12-31

    Surface-treated wollastonite powder is a kind of new inorganic filler for cable insulation composition. The elemental composition, properties and main uses of the wollastonite short fiber are described. The slenderness ratio, particle size, particle shape content and ways of surface treatment of the wollastonite are discussed. The experiments show that the wollastonite short fiber inorganic filler provides good reinforcement and electrical insulation. By means of SEM and rheogeniometer, the distribution and fluidity of the cable insulation compositions have been observed. The balance of the experiments of the wollastonite powder and other organic fillers such as calcine clay and CaCO{sub 3} were finished.

  8. A Sol-Gel Approach to the Insulation of Rutherford Cables

    SciTech Connect

    Buta, F. [Global Research and Development, Inc., Columbus, Ohio, 43210 (United States); LASM, MSE, Ohio State University, Columbus, Ohio, 43210 (United States); Hascicek, Y.S.; Arda, L.; Aslanoglu, Z.; Akin, Y. [National High Magnetic Field Laboratory, Tallahassee, Florida, 32310 (United States); Sumption, M.D.; Collings, E.W. [LASM, MSE, Ohio State University, Columbus, Ohio, 43210 (United States)

    2004-06-28

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

  9. A Sol-Gel Approach to the Insulation of Rutherford Cables

    NASA Astrophysics Data System (ADS)

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

    2004-06-01

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

  10. Thermal Insulation Performance of Flexible Piping for Use in HTS Power Cables

    NASA Technical Reports Server (NTRS)

    Fesmire, James E.; Augustynowicz, S. D.; Demko, J. A.; Thompson, Karen (Technical Monitor)

    2001-01-01

    High-temperature superconducting (HTS) cables that typically operate at temperatures below 80 K are being developed for power transmission. The practical application of HTS power cables will require the use of flexible piping to contain the cable and the liquid nitrogen coolant. A study of thermal performance of multilayer insulation (MLI) was conducted in geometries representing both rigid and flexible piping. This experimental study performed at the Cryogenics Test Laboratory of NASA Kennedy Space Center provides a framework for the development of cost-effective, efficient thermal insulation systems that will support these long-distance flexible lines containing HTS power cables. The overall thermal performance of the insulation system for a rigid configuration and for a flexible configuration, simulating a flexible HTS power cable, was determined by the steady-state liquid nitrogen boiloff method under the full range of vacuum levels. Two different cylindrically rolled material systems were tested: a standard MLI and a layered composite insulation (LCI). Comparisons of ideal MLI, MLI on rigid piping, and MLI between flexible piping are presented.

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

    SciTech Connect

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

    1996-01-01

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

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

    NASA Technical Reports Server (NTRS)

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

    1988-01-01

    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.

  13. Effect of processing conditions on the reliability of cross-linked polyethylene cable insulation. First year report

    SciTech Connect

    Phillips, P J

    1980-01-01

    Progress is reported in crystallization and morphology, treed cables, and cable production on the reliability of cross-linked polyethylene cable insulation. Scanning electron microscopy of polished surfaces etched with carbon tetrachloride vapor, differential scanning calorimetry and x-ray diffraction were used for morphological investigations until recently when good results have been obtained using the technique of permanganic acid etching. (FS)

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

    PubMed

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

    2015-02-01

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

  15. 46 CFR 111.60-21 - Cable insulation tests.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...insulation resistance to ground and between conductors. The insulation resistance must not be less than that in section 34.2.1 of IEEE 45-2002 (incorporated by reference; see 46 CFR 110.10-1). [USCG-2003-16630, 73 FR 65199, Oct. 31,...

  16. Heat transfer through Rutherford superconducting cable with novel pattern of polyimide electrical insulation in pressurized superfluid helium environment

    NASA Astrophysics Data System (ADS)

    Chorowski, Maciej; Polinski, Jaroslaw; Strychalski, Michal

    2012-06-01

    Future LHC accelerator luminosity upgrade will increase a beam losses heat deposition in the superconducting magnet coils. Main barrier of the heat evacuation from the coils made of Rutherford type cables is a cable electrical insulation. The insulation is made of polyimide tapes wrapped around the cable in a special configuration. Presently used insulation wrapping schemes constitute very good electrical insulation with relatively low heat transport ability. Therefore a new insulation wrapping schemes with enhanced helium permeability and adequate dielectric properties have been developed at CERN. An experimental comparative study of heat transfer perpendicular to the Rutherford type cable, for an old and new insulation wrapping schemes have been accomplished at Wroclaw University of Technology. The tests have been performed in pressurized superfluid helium conditions, and at 60 MPa of the sample applied external pressure simulating the Lorentz forces. This paper presents the measurements methodology and gives experimental results.

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

    SciTech Connect

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

    2010-01-01

    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.

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

    NASA Astrophysics Data System (ADS)

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

    2014-09-01

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

  19. A coupled conduction convection and radiation problem for three insulated cables suspended in air

    Microsoft Academic Search

    Y. Liu; N. Phan-Thien; R. Kemp; X.-L. Luo

    1998-01-01

    The coupled heat conduction, convection and radiation problem for three heated insulated cables suspended in air is solved\\u000a by an operator-splitting pseudo-time-stepping finite element method, which automatically satisfies the continuity of the interfacial\\u000a temperature and heat flux. The main feature of the solution procedure is that the multi-phases are treated as a single computational\\u000a domain with unknown interfacial boundary conditions.

  20. A coupled conduction convection and radiation problem for three insulated cables suspended in air

    Microsoft Academic Search

    Y. Liu; N. Phan-Thien; R. Kemp; X.-L. Luo

    1997-01-01

    The coupled heat conduction, convection and radiation problem for three heated insulated cables suspended in air is solved\\u000a by an operator-splitting pseudo-time-stepping finite element method, which automatically satisfies the continuity of the interfacial\\u000a temperature and heat flux. The main feature of the solution procedure is that the multi-phases are treated as a single computational\\u000a domain with unknown interfacial boundary conditions.

  1. Packet-like space charges and conduction current in polyethylene cable insulation

    Microsoft Academic Search

    Hiroyuki Kon; Yasuo Suzuoki; Teruyoshi Mizutani; M. Ieda; N. Yoshifuji

    1996-01-01

    Packet-like space-charge behavior in polyethylene for cable insulation was studied by utilizing the laser-induced pressure-pulse technique. Space charge observation under various conditions showed that the charge packet was formed in the specimen doped with antioxidant, especially when the specimen is oxidized. Periodic formation and transport of charge packets led to a small current oscillation. The charge packet seemed to be

  2. Steady-state heat transfer in He II through porous superconducting cable insulation

    SciTech Connect

    Baudouy, B.J.P.; Juster, F.P.; Meuris, C.; Vieillard, L. [CEA, Gif sur Yvette (France)] [and others

    1996-12-31

    The LHC program includes the study of thermal behavior of the superconducting cables wound in the dipole magnet cooled by superfluid helium (He II). Insulation of these superconducting cables forms the major thermal shield hindering the He II cooling. This is particularly a problem in magnets which are subjected to thermal loads. To investigate He II heat transfer processes an experimental model has been realized which creates a one-dimensional heat transfer in such media. Insulation is generally realized by wrapping around the superconducting cable a combination of different kind of Kapton{reg_sign} tapes, fiber-glass impregnated by epoxy resin or Kevlar{reg_sign} fiber tapes. Steady-state heat transfer in He II through these multi-layer porous slabs has been analyzed. Experimental results for a range of heat flux show the existence of different thermal regimes related to He II. It is shown that the parameters of importance are a global geometrical factor which could be considered as an equivalent {open_quotes}permeability{close_quotes} related to He II heat transfer, the transfer function f(T) of He II and the thermal conductivity of the slab. The authors present and analyze results for different insulations as a function of the temperature.

  3. Long-term aging and loss-of-coolant accident (LOCA) testing of electrical cables

    SciTech Connect

    Nelson, C.F.; Gauthier, G.; Carlin, F. [and others

    1996-10-01

    Experiments were performed to assess the aging degradation and loss-of-coolant accident (LOCA) behavior of electrical cables subjected to long-term aging exposures. Four different cable types were tested in both the U.S. and France: (1) U.S. 2 conductor with ethylene propylene rubber (EPR) insulation and a Hypalon jacket. (2) U.S. 3 conductor with cross-linked polyethylene (XLPE) insulation and a Hypalon jacket. (3) French 3 conductor with EPR insulation and a Hypalon jacket. (4) French coaxial with polyethylene (PE) insulation and a PE jacket. The data represent up to 5 years of simultaneous aging where the cables were exposed to identical aging radiation doses at either 40{degrees}C or 70{degrees}C; however, the dose rate used for the aging irradiation was varied over a wide range (2-100 Gy/hr). Aging was followed by exposure to simulated French LOCA conditions. Several mechanical, electrical, and physical-chemical condition monitoring techniques were used to investigate the degradation behavior of the cables. All the cables, except for the French PE cable, performed acceptably during the aging and LOCA simulations. In general, cable degradation at a given dose was highest for the lowest dose rate, and the amount of degradation decreased as the dose rate was increased.

  4. Coupled conduction-convection problem for an underground rectangular duct containing three insulated cables

    SciTech Connect

    Liu, Y.; Phan-Thien, N.; Kemp, R.; Luo, X.L. [Univ. of Sydney, New South Wales (Australia). Dept. of Mechanical and Mechatronic Engineering

    1997-03-01

    The coupled heat conduction-convection problem for three insulating cables resting in a rectangular duct filled with air, which is buried underground, is solved by an operator-splitting pseudo-time-stepping finite element method. The method automatically satisfies the continuity of the interfacial temperature and heat flux. The temperature distribution in the metal cores, in the insulating layers, and in the surrounding air and soil, together with the convective flow pattern, are obtained simultaneously. From the profile of the local Nusselt number, which is strongly dependent on the thermal conductivity ratios and weakly dependent on the Rayleigh number, it is concluded that most of the heat transfer takes place via the bottom of the enclosure through a conductive mode.

  5. A Novel Electrical Insulating Material for 275 kV High-Voltage HTS Cable with Low Dielectric Loss

    NASA Astrophysics Data System (ADS)

    Hayakawa, N.; Nishimachi, S.; Maruyama, O.; Ohkuma, T.; Liu, J.; Yagi, M.

    2014-05-01

    In the case of high temperature superconducting (HTS) power transmission cables at high voltage operation, the electrical insulation technique in consideration of the dielectric loss reduction becomes crucial. In this paper, we focused on a Tyvek/polyethylene (PE) sheet, instead of the conventional polypropylene laminated paper (PPLP). We obtained the dielectric characteristics (epsilonr, tan?) and partial discharge inception strength (PDIE) of PPLP, Tyvek and Tyvek/PE. We pointed out that the dielectric loss of 275 kV HTS cable with Tyvek/PE insulation will be reduced to 21 % of that with PPLP, and the total electrical loss including the AC loss will be reduced to 41 %.

  6. Effect of semiconducting screen on the space charge dynamic in XLPE and polyolefin insulation under DC and 50 Hz AC electric stresses conditions

    Microsoft Academic Search

    Y. F. F. Ho; H. G. Chen; A. E. Davies; S. G. Swingler; S. J. Sutton; R. N. Hampton

    2003-01-01

    In the past two decades, significant advances in space charge measurements in polymers have resulted in a better understanding of charge dynamics and their effect on material selection and processing. However, little attention has been given to the effect of semiconducting screens on space charge formation in the bulk insulation. This paper reports on space charge measurements on ? 1.5

  7. Finite element computation of field, forces and inductances in underground SF\\/sub 6\\/ insulated cables using a coupled magneto-thermal formulation

    Microsoft Academic Search

    D. Labridis; V. Hatziathanassiou

    1994-01-01

    A finite element (FE) iterative formulation has been used for the computation of the coupled magneto-thermal field in underground SF[sub 6] insulated high voltage cables. The formulation takes into account the real geometrical and physical properties of the involved materials. Using the field distribution, the cable ampacity and losses, the force and the inductances have been calculated for both isolated

  8. Finite element computation of field, forces and inductances in underground SF6 insulated cables using a coupled magneto-thermal formulation

    Microsoft Academic Search

    D. Labridis; V. Hatziathanassiou

    1994-01-01

    A finite element (FE) iterative formulation has been used for the computation of the coupled magneto-thermal field in underground SF6 insulated high voltage cables. The formulation takes into account the real geometrical and physical properties of the involved materials. Using the field distributions, the cable ampacity and losses, the forces and the inductances have been calculated for both isolated phase

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

    SciTech Connect

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

    1995-11-01

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

  10. 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)

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

    2014-05-01

    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.

  11. Development of CCVD ceramic insulation for Bi2212 superconducting wires and Rutherford cables

    Microsoft Academic Search

    Yibin Xue; S. Mark; S. Shoup; K. R. Marken; Hanping Miao; M. Maarten; S. A. Gourlay; R. Scanlan

    2003-01-01

    A low cost, open-atmosphere deposition technique, Combustion Chemical Vapor Deposition (CCVD) is used to deposit zirconia-based, multi-component insulation films on Bi-2212 tapes for fabricating high temperature superconducting magnet coils. The insulation coatings were investigated in detail in terms of composition, microstructure, and insulation strength versus the deposition temperature and other parameters. Dielectric and mechanical properties and chemical compatibility with BSCCO

  12. Design and test of low-capacitance, air-insulated, 80kV, 0. 5-sec source cables for MFTF sustaining-neutral-beam power supples

    Microsoft Academic Search

    D. J. Mayhall; J. H. Wilson; W. J. Caldwell; T. F. Watson; J. W. Jr. Jenkins

    1981-01-01

    The design of air-insulated cables, which meet strict requirements, is described. Inductance, heat transfer, and electrostatic computer codes are used in design. Tests include electric circiut parameters, dc voltage holdoff, impulse voltage holdoff, heat rise at greater than peak duty, and shield mechanical strength.

  13. Design and test of low-capacitance, air-insulated, 80-kV, 0. 5-sec source cables for MFTF sustaining-neutral-beam power supples

    SciTech Connect

    Mayhall, D.J.; Wilson, J.H.; Caldwell, W.J.; Watson, T.F.; Jenkins, J.W. Jr.

    1981-10-16

    The design of air-insulated cables, which meet strict requirements, is described. Inductance, heat transfer, and electrostatic computer codes are used in design. Tests include electric circiut parameters, dc voltage holdoff, impulse voltage holdoff, heat rise at greater than peak duty, and shield mechanical strength.

  14. Superconductor cable

    DOEpatents

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

    2009-12-15

    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).

  15. Space charge measurement in dc cable materials

    Microsoft Academic Search

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

    1991-01-01

    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:

  16. Aging of extruded dielectric power cables: Theory

    SciTech Connect

    Crine, J.P.; Dang, C.; Parpal, J.L. (Institut de Recherche d'Hydro-Quebec, Varennes, PQ (Canada))

    1992-12-01

    The objective of this study was to seek to develop a reliable aging model of extruded cables. From a review of existing theories and experimental data, it is deduced that the rate theory, modified to take into account some elements of the Zhurkov and Zeller theories, could describe the electrical aging of extruded cables. The proposed model relies on two physical parameters: [Delta]G[sup 0] and [lambda], the free energy and the width of the barrier controlling aging. The model predicts that at high fields there is a linear relation between electric field and the log of time-to-breakdown. In this regime, aging appears to be irreversible and it is possibly associated with changes in the nature of the insulation; this has to be verified. Below a given critical field, the breakdown field does not vary linearly with the log of time-to-breakdown. It was verified that the proposed model describes the published voltage endurance results for HMW-PE, XLPE and the EPR cables aged in air and water. The influence of air, water, temperature and polymer nature on the values of [Delta]G and [lambda][sub max] was briefly discussed. A critical field above which the time-to-breakdown increases exponentially with the applied electric field was observed insome cases. Morphology changes were also observed in laboratory samples electrically aged at fields higher than the critical field. In its present from, the model allows the determination of the value of the critical field from the low field limit of the exponential regime. Various materials can also be compared from the values of [Delta]G[sub 0] and [lambda][sub max] determined from high field endurance results.

  17. Packet-like space-charge behavior and conduction current in polyethylene for cable insulation

    Microsoft Academic Search

    H. Kon; Y. Suzuoki; T. Mizutani; N. Yoshifuji

    1995-01-01

    Space charge in insulating polymers is known to affect high field phenomena such as conduction and breakdown. Recently, space-charge behavior has become widely studied by utilizing various direct space-charge probing techniques, e.g. the pulse electroacoustic (PEA) method and the laser-induced-pressure-pulse ( LIPP) technique. Dynamic behavior of space charge is considered to be very important especially under very high field. Recently,

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

    NASA Technical Reports Server (NTRS)

    1977-01-01

    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.

  19. Molds for cable dielectrics

    DOEpatents

    Roose, Lars D. (Albuquerque, NM)

    1996-01-01

    Molds for use in making end moldings for high-voltage cables are described wherein the dielectric insulator of a 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.

  20. Molds for cable dielectrics

    DOEpatents

    Roose, L.D.

    1996-12-10

    Molds for use in making end moldings for high-voltage cables are described wherein the dielectric insulator of a 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. 5 figs.

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

    NASA Astrophysics Data System (ADS)

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

    2014-08-01

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

  2. Development of HTS power cable using YBCO coated conductor

    NASA Astrophysics Data System (ADS)

    Mukoyama, Shinichi; Yagi, Masashi; Hirano, Hironobu; Yamada, Yutaka; Izumi, Teruo; Shiohara, Yuh

    2006-10-01

    Reductions of AC losses and of cost of HTS power cables are important to put it into practical power networks. Since an YBCO-coated-conductor (YBCO tape) has higher Jc and better magnetic property than a Bi2223-Ag-sheathed-tape, an AC power cable using YBCO tapes will obtain higher performance than XLPE-cables and HTS cables using BSCCO tapes in future. Especially, an YBCO HTS cable will be expected to become a higher economical cable than a Bi cable because an YBCO tape reduced its AC losses and its wire cost. We have started developing HTS power cables using YBCO tapes. Mechanical properties, superconducting properties and other electro magnetic properties of YBCO tapes have been measured to estimate the applicability to the HTS cable. Moreover, we have developed some technologies to bring out latent potentials of YBCO tapes.

  3. 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)

    Galofaro, Joel T.

    1990-01-01

    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.

  4. End moldings for cable dielectrics

    DOEpatents

    Roose, Lars D. (Albuquerque, NM)

    2000-01-01

    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 is 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. End moldings for cable dielectrics

    SciTech Connect

    Roose, L.D.

    1993-12-31

    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.

  6. 30 CFR 18.40 - Cable clamps and grips.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...portable (trailing) cables to prevent strain on the cable terminals of a machine...insulated clamps shall be provided to prevent strain on both ends of each cable or cord...cable may be used in lieu of insulated strain clamps. Supporting clamps for cables...

  7. Development of New-type Outdoor Termination using Composite Insulator with SF6 Gas

    NASA Astrophysics Data System (ADS)

    Kusuda, Yusuke; Fukuda, Kinya; Matsumura, Masao; Hagisawa, Kazuhisa; Okamoto, Gaku; Nakanishi, Tatsuo; Inoue, Yoshiyuki

    Recently, composite insulators have been increasingly employed mainly from the economic viewpoint. We have been developed new type outdoor termination with composite insulator, which can be installed horizontally on the steel tower, in order to reduce the construction cost. In this outdoor termination, SF6 gas is filled in the composite insulator and a cold shrinkable pre-molded rubber unit is applied instead of the combinational use of rubber-molded stress relief cone, epoxy resin insulator and spring unit. The application of composite insulator, SF6 gas and cold shrinkable pre-molded rubber unit lights the total weight and makes it possible to install horizontally on the tower. The composite insulator type outdoor termination for 77kV XLPE cable has already applied as commercial use and enabled to reduce the construction cost of power transmission lines. A 154kV new type outdoor termination has been developed and successfully completed the initial electrical test. This paper describes the design and performance of both 77kV and 154kV new type outdoor termination, and the follow-up survey of 77kV outdoor termination in the commercial power transmission line.

  8. Water treeing in polyethylene cables

    Microsoft Academic Search

    E. F. Steennis; F. H. Kreuger

    1990-01-01

    Water tree growth in polyethylene cable insulation is discussed. The characteristics of water trees, the effect of aging parameters on water tree growth, and the possible mechanisms of growth are considered, emphasizing vented tree development in polyethylene insulating materials. The morphology of water trees, the characteristics of the tree-infested dielectric cable, and test methods and measures to reduce water treeing

  9. Cable Diagnostic Focused Initiative

    SciTech Connect

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

    2010-12-30

    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.

  10. Process of modifying a cable end

    DOEpatents

    Roose, Lars D. (Albuquerque, NM)

    1995-01-01

    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.

  11. LOCA testing of damaged cables

    SciTech Connect

    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

    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.

  12. LOCA testing of damaged cables

    SciTech Connect

    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

    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.

  13. COPPER CABLE RECYCLING TECHNOLOGY

    SciTech Connect

    Chelsea Hubbard

    2001-05-01

    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.

  14. Diagnostics and Prognostics of Electric Cables in Nuclear Power Plants via Joint Time-Frequency Domain Reflectometry

    Microsoft Academic Search

    Jingjiang Wang; Philip Crapse; Yong-June Shin; R. Dougal

    2008-01-01

    Defective cables in the electric power systems of nuclear power plants can cause a component to fail, resulting in potential safety concerns. Due to this problem, a non-destructive, non-intrusive condition assessment technique is highly desirable. Joint time-frequency domain reflectometry (JTFDR) is proposed and verified to be effective for cross-linked polyethylene (XLPE) cable, which serves critical instrumentation and control operations in

  15. Effects of voltage surges on extruded dielectric cable life project update

    SciTech Connect

    Hartlein, R.A.; Harper, V.S. (Georgia Power Co., Atlanta, GA (United States)); Ng, H. (Electric Power Research Inst., Palo Alto, CA (United States))

    1994-04-01

    Electric utility engineers have commented that extruded distribution cables frequently fail during or shortly after a thunder storm. These engineers also comment that failures often reoccur on cable circuits where previous failures were located with a thumper. Linemen at Georgia Power often make similar comments. To investigate this observation, crosslinked (XLPE) and tree retardant crosslinked (TRXLPE) cable designs were subjected to accelerated water treeing tests. Samples were subjected to simulated lightning surges or simulated thumping surges. Crosslinked cables removed after 15 years of service operation were also subjected to these surges. The results show that, in some cases, lightning surges do reduce extruded distribution cable life. Also, high level thumping surges appear to reduce cable life once cables are well aged.

  16. Effects of constituents of XLPE on the formation of space charge

    Microsoft Academic Search

    Kwang S. Suh; Sun J. Hwang; Jin S. Noh; Tatsuo Takada

    1994-01-01

    The effects of such constituents as the crosslinked part, non-crosslinked LDPE part, antioxidant, and residual byproducts on the formation of space charge in XLPE have been investigated. It has been found that homocharge is developed in the pure crosslinked part of XLPE. The non-crosslinked LDPE part encourages the formation of heterocharge, although its influence is not strong. Residual byproducts generated

  17. 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

    Not Available

    1980-07-07

    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.

  18. The effect of degassing on morphology and space charge

    Microsoft Academic Search

    Y. L. Chong; G. Chen; Y. F. F. Ho

    2004-01-01

    It is believed that space charge buildup in cross-linked polyethylene (XLPE) insulation is one of the main cause for premature failure of underground power cables. The space charge activities in XLPE depend on many factors such as additives, material treatment, ambient temperature, insulator\\/electrode interface, etc. Degassing is one of the material treatment processes commonly employed in cable manufacturing to improve

  19. Development of cold-shrinkable joints with carrier pipes for EHV cables

    Microsoft Academic Search

    H. Suzuki; S. Kobayashi; T. Ono; D. Muto; S. Tanaka; H. Kurihara; H. Nomura

    2000-01-01

    One piece, pre-molded joints have been used all over the world for extra high voltage (EHV) XLPE cables. For those premolded joints, ethylene-propylene rubber has mainly been applied for many years. We have succeeded in applying a new cold-shrink technology on those pre-molded joints by using silicone rubber which has lower elasticity and better mechanical properties, such as lower permanent

  20. Superconductor cable

    DOEpatents

    Allais, Arnaud; Schmidt, Frank; Marzahn, Erik

    2010-05-04

    A superconductor cable is described, having a superconductive flexible cable core (1) , which is laid in a cryostat (2, 3, 4), in which the cable core (1) runs in the cryostat (2, 3, 4) in the form of a wave or helix at room temperature.

  1. Cable Car

    NSDL National Science Digital Library

    2014-09-12

    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.

  2. High conductance surge cable

    DOEpatents

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

    1998-12-08

    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.

  3. Development of 3-in-One High Temperature Superconducting Cable

    NASA Astrophysics Data System (ADS)

    Masuda, Takato; Kato, Takeshi; Hirose, Masayuki; Sato, Kenichi

    A three-in-One HTS cable has been developed. Its cable core is composed of a conductor and a shield wound with BSCCO wires and electrical insulation of the PPLP. The three cable cores are covered in thermal insulated stainless corrugated pipes. Recently, BSCCO wires were drastically innovated by virtue of a newly developed process named as Controlled Over-Pressure (CT-OP). As a new cable technology, a 350m thermal insulation pipe was tested for 7 months to find that a life of the vacuum property is more than 10 years. The HTS cable with tension members was designed for installation into an underground duct. In addition, a fault current of 23kA, 0.63sec, was applied to a sample cable with no damage on the BSCCO wires and the cable insulation. These technologies will be applied to Albany project in USA.

  4. Cable compliance

    NASA Astrophysics Data System (ADS)

    Kerley, J.; Eklund, W.; Burkhardt, R.; Rossoni, P.

    1992-06-01

    The object of the investigation was to solve mechanical problems using cable-in-bending and cable-in-torsion. These problems included robotic contacts, targets, and controls using cable compliance. Studies continued in the use of cable compliance for the handicapped and the elderly. These included work stations, walkers, prosthetic knee joints, elbow joints, and wrist joints. More than half of these objects were met, and models were made and studies completed on most of the others. It was concluded that the many different and versatile solutions obtained only opened the door to many future challenges.

  5. Cable compliance

    NASA Technical Reports Server (NTRS)

    Kerley, J.; Eklund, W.; Burkhardt, R.; Rossoni, P.

    1992-01-01

    The object of the investigation was to solve mechanical problems using cable-in-bending and cable-in-torsion. These problems included robotic contacts, targets, and controls using cable compliance. Studies continued in the use of cable compliance for the handicapped and the elderly. These included work stations, walkers, prosthetic knee joints, elbow joints, and wrist joints. More than half of these objects were met, and models were made and studies completed on most of the others. It was concluded that the many different and versatile solutions obtained only opened the door to many future challenges.

  6. Induced transients in substation cables: Measurements and models

    Microsoft Academic Search

    D. E. Thomas; C. M. Wiggins; T. M. Salas; F. S. Nickel; S. E. Wright

    1994-01-01

    An extensive set of switching transient EMI response measurements on several types of substation cables and internal cable wires in described in this paper. Measured and predicted cable\\/wire current and voltage transients at both air-insulated substations (AIS) and gas-insulated substations (GIS) are presented, for system voltages ranging from 115 kV to 500 kV.. The maximum peak-to-peak amplitudes of measured wire

  7. Cable design

    NASA Technical Reports Server (NTRS)

    Gerpheide, B. A.

    1972-01-01

    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.

  8. Changes In Isomeric Composition of Lab Cable Oil Associated With A Range of Terminal Electron Acceptors

    Microsoft Academic Search

    S. J. Johnson; N. Christofi; D. A. Barry

    2002-01-01

    Synthetic linear alkylbenzenes (LABs) are used as insulating oils in underground elec- tricity transmission cables. Following accidental damage to the cables or a failure of the cable system, oil may leak into the surrounding soil. The cable is normally repaired quickly and the majority of the oil is recovered, but access to soil containing residual contamination may be hampered by

  9. Novel Reflectometry Method Based on Time Reversal for Cable Aging Characterization

    E-print Network

    Paris-Sud XI, Université de

    exist in all electrical systems, and are used to transmit power or data. The problem of cables aging has-mail: lola.el-sahmarany@cea.fr Abstract--This paper investigates the effects of aging on electrical cable on the detection and estimation of electrical cable aging. The cable (insulators) properties are reversibly

  10. Influence of physical properties and peroxide decomposition products on the space charge formation in XLPE and EPDM

    Microsoft Academic Search

    YASUO SEKII; TADASHI KOGURE; TAKASHI MAENO

    1997-01-01

    Distributions of space charges formed under DC voltage in LDPE, XLPE and EPDM were studied using pulsed electroacoustic methods. The material density of LDPE was found to affect the space charge distribution, whereas the MFR shows no influence. Heterocharges are created in XLPE containing peroxide decomposition products, while homocharges are formed in the absence of decomposition products. It was confirmed

  11. Sectionalized marine seismic cable

    SciTech Connect

    Neeley, W.P.

    1984-05-22

    A marine seismic cable is sectionalized with the individual cable sections being joined by articulated connector assemblies which permit relative bending movement between such individual cable sections.

  12. Curing system for high voltage cross linked cables

    DOEpatents

    Bahder, George (Edison, NJ); Katz, Carlos (Edison, NJ); Bopp, Louis A. (Fair Haven, NJ)

    1978-01-01

    This invention makes extruded, vulcanized, high voltage cables insulated with thermosetting compounds at much higher rates of production and with superior insulation of reduced thickness and with reduced cavities or voids in the insulation. As the cable comes from an extruder, it passes into a curing chamber with a heat booster that quickly raises the insulation to a temperature at which it is cured much more quickly than with steam heating of the prior art. A high temperature liquid in contact with the insulation maintains the high temperature; and because of the greater curing heat, the cable can travel through the curing chamber at a faster rate and into a cooling tube where it contacts with a cooling liquid under high pressure. The insulation compound is treated to reduce the size of cavities; and the high pressure maintained by the curing and cooling mediums prevent expansion of cavities before the insulation is set.

  13. Extending cable life with better jackets

    SciTech Connect

    NONE

    1995-05-01

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

  14. Wire and Cable Cold Bending Test

    NASA Technical Reports Server (NTRS)

    Colozza, Anthony

    2010-01-01

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

  15. Computer simulation on formation of space charge packets in XLPE films

    Microsoft Academic Search

    K. Kaneko; T. Mizutani; Y. Suzuoki

    1999-01-01

    The packet-like space-charge behaviour in an oxidized crosslinked polyethylene (XLPE) film doped with antioxidant is discussed through computer simulation. The model is based on the following assumptions, (1) both electrons and holes are injected from the electrodes and they migrate to the opposite electrodes by hopping transport, (2) holes are also supplied from acceptor sites depending on the field, (3)

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

    NASA Technical Reports Server (NTRS)

    Angele, W.

    1969-01-01

    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.

  17. Superconductor cable

    DOEpatents

    Smith, Jr., Darrell F. (Huntington, WV); Lake, Bill L. (Ona, WV); Ballinger, Ronald G. (Andover, MA)

    1988-01-01

    A superconducting cable comprising an in-situ-formed type II superconductor, e.g. Nb.sub.3 Sn, in association with a stabilizing conductor both in heat transfer relationship with at least one passage adapted to carry liquified gaseous refrigerant. The conductor and said at least one passage are enclosed by a sheath comprising an alloy consisting essentially of about 49% nickel, about 4% chromium, about 3% niobium, about 1.4% titanium, about 1% aluminum, balance essentially iron.

  18. 30 CFR 77.602 - Permanent splicing of trailing cables.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...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 otherwise made with...

  19. Hot-blade stripper for polyester insulation on FCC

    NASA Technical Reports Server (NTRS)

    Angele, W.; Chambers, C. M.

    1971-01-01

    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.

  20. Termination of flat conductor cable to NASA/MSFC plugs

    NASA Technical Reports Server (NTRS)

    Angele, W.

    1972-01-01

    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.

  1. Flat-conductor cable has rotary and linear flexibility

    NASA Technical Reports Server (NTRS)

    Carden, J. R.

    1971-01-01

    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.

  2. Electrical life threshold models for solid insulating materials subjected to electrical and multiple stresses. I. Investigation and comparison of life models

    Microsoft Academic Search

    Gian Carlo Montanari

    1992-01-01

    In the paper, life models, are collected valid for solid insulating materials subjected to electrical and multiple thermal-electrical stresses whose life lines show a tendency to reach an electrical threshold. Their fit is investigated with reference to several sets of data derived from accelerated life tests performed on different insulating materials (XLPE, composite Nomex-Mylar-Nomex, epoxy bisphenolic resin, polyimide). In particular,

  3. An Internal Coaxial Cable Electrical Connector For Use In Downhole Tools

    DOEpatents

    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

    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.

  4. Electrical performance in salt-fog of XLPE containing different levels of calcium carbonate filler

    Microsoft Academic Search

    H. Deng; R. Hackam

    1994-01-01

    The leakage current and the lifetime of cross-linked polyethylene (XLPE) were measured in a moderate salt-fog pollution as a function of concentration of calcium carbonate filler. Measurements of surface roughness and of the contact angle of water droplets on the surface combined with the examinations of the surface using an Energy Dispersive X-ray Spectroscopy (EDAX) and Scanning Electron Microscopy (SEM)

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

    NASA Technical Reports Server (NTRS)

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

    1973-01-01

    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.

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

    NASA Astrophysics Data System (ADS)

    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

    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.

  7. Marine cable location system

    SciTech Connect

    Zachariadis, R.G.

    1984-05-01

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

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

    NASA Astrophysics Data System (ADS)

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

    2014-05-01

    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).

  9. Cable load sensing device

    DOEpatents

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

    1998-01-01

    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.

  10. Cutting Edge Cable Management.

    ERIC Educational Resources Information Center

    Peach, Roger

    1997-01-01

    Describes how one school district was able to efficiently install fragile telecommunication cabling throughout its high school and save thousands of dollars. Discusses solutions to some common cable-management problems. (GR)

  11. Cables and fire hazards

    NASA Technical Reports Server (NTRS)

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

    1986-01-01

    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.

  12. Cable Television: Franchising Considerations.

    ERIC Educational Resources Information Center

    Baer, Walter S.; And Others

    This volume is a comprehensive reference guide to cable television technology and issues of planning, franchising, and regulating a cable system. It is intended for local government officials and citizens concerned with the development of cable television systems in their communities, as well as for college and university classes in…

  13. Fiber Optic Cables

    NSDL National Science Digital Library

    Bartelt, Terry L. M.

    This brief interactive activity, by the Electromechanical Digital Library and Wisconsin Technical College System faculty, is an easy-to-use introduction to fiber optic cables and their uses. Students are able to reveal each section at their leisure as they click through the helpful illustrations and animations on fiber optic cable components, LEDâ??s, multi-mode and single-mode cables, and cable connectors. Three review questions wrap up the slide show to test knowledge gained. This would be a great resource for teachers to help introduce the topic to students, or for students to have a comprehensive overview of fiber optic cables.

  14. The Influence of Material Modification and Residues on Space Charge Accumulation in XLPE for DC Cable Application

    Microsoft Academic Search

    L. Dissado; J. Fothergill

    Effects of cross-linking by-products (residues) of polyethylene on space charge accumulation and decay are investigated in the paper using the pulsed electro-acoustic technique. Space charge profiles have shown a great variation both in the charge initiation over the voltage ramping up process and later on long term stressing and decay (volts off) among the samples subjected to different conditioning, which

  15. Test of Insulation Electrical Strength of LARP Technological Quadrupoles (TQ)

    Microsoft Academic Search

    D. Tooke; G. Ambrosio; N. Andreev; R. Bossert

    This is a report about measuring the Insulation Electrical Strength of a TQC and a TQS practice coil. Tests were performed under transverse pressure up to 190 MPa at voltage up to 1000 V. Turn-to-turn insulation strength was measured between cables within the inner layer and within the outer layer. Layer-to-layer insulation strength was measured as well.

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

    SciTech Connect

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

    1994-04-01

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

  17. Life-assessment technique for nuclear power plant cables

    NASA Astrophysics Data System (ADS)

    Bartoní?ek, B.; Hnát, V.; Pla?ek, V.

    1998-06-01

    The condition of polymer-based cable material can be best characterized by measuring elongation at break of its insulating materials. However, it is not often possible to take sufficiently large samples for measurement with the tensile testing machine. The problem has been conveniently solved by utilizing differential scanning calorimetry technique. From the tested cable, several microsamples are taken and the oxidation induction time (OIT) is determined. For each cable which is subject to the assessment of the lifetime, the correlation of OIT with elongation at break and the correlation of elongation at break with the cable service time has to be performed. A reliable assessment of the cable lifetime depends on accuracy of these correlations. Consequently, synergistic effects well known at this time - dose rate effects and effects resulting from the different sequence of applying radiation and elevated temperature must be taken into account.

  18. Naval Research Laboratory array cable qualifying test program. Contract report

    SciTech Connect

    Swenson, R.C.; Howell, T.A.

    1994-08-01

    In 1993, Neptune Technologies designed and fabricated two prototype array cables under NRL`s support. Briefly, these two generic cables consisted of a monolay construction utilizing 18 singles and atwisted pair construction incorporating seven twisted pairs. Each conductor core was strengthened with an overbraid of Kevlar, then one core was jacketed with a braided sleeve of polyester which incorporated a fuzz type fairing, while the monocore incorporated an extruded jacket with a straked strum suppressor. The essence of the new cables are small AWG number 26 conductors insulated with a thin coating of Surlyn. These much smaller conductors are expected to provide a smaller cable with higher reliability. See Neptune Report dated December 32,1993, entitled Prototype Cable Final Technical Report.

  19. Magnet cable manufacturing

    SciTech Connect

    Royet, J.

    1990-10-01

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

  20. Cable Tester Box

    NASA Technical Reports Server (NTRS)

    Lee, Jason H.

    2011-01-01

    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.

  1. Cable Measuring Engine Operation Procedures

    SciTech Connect

    Authors, Various

    1997-07-11

    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.

  2. Cabling Installation & Maintenance Magazine

    NSDL National Science Digital Library

    This site offers articles and information about cabling solutions and components for fiber and copper communications, voice, data, and video systems. Cable installation and repair issues cover coaxial, twisted-pair, fiber-optic, zipcord, wireless, and network management. Instructional videos covering timely topics of importance to workers and decisionmakers in the data telecommunications industry are provided. Cable contractors and suppliers worldwide are also listed.

  3. HTS cable design and evaluation in YOKOHAMA Project

    NASA Astrophysics Data System (ADS)

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

    2010-06-01

    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.

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

    NASA Technical Reports Server (NTRS)

    Rigling, W. S.

    1974-01-01

    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.

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

    Microsoft Academic Search

    W. S. Rigling

    1974-01-01

    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

  6. 49 CFR 236.71 - Signal wires on pole line and aerial cable.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...Cables § 236.71 Signal wires on pole line and aerial cable. Signal wire on pole line shall be securely tied in on insulator properly fastened to crossarm or bracket supported by pole or other support. Signal wire shall not interfere with, or...

  7. 49 CFR 236.71 - Signal wires on pole line and aerial cable.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...Cables § 236.71 Signal wires on pole line and aerial cable. Signal wire on pole line shall be securely tied in on insulator properly fastened to crossarm or bracket supported by pole or other support. Signal wire shall not interfere with, or...

  8. 49 CFR 236.71 - Signal wires on pole line and aerial cable.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...Cables § 236.71 Signal wires on pole line and aerial cable. Signal wire on pole line shall be securely tied in on insulator properly fastened to crossarm or bracket supported by pole or other support. Signal wire shall not interfere with, or...

  9. 46 CFR 111.60-1 - Construction and testing of cable.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...applicable, for cables rated above 5,000 volts. (d) Electrical cable that has a polyvinyl-chloride insulation with a nylon jacket (Type T/N) must meet either UL 1309, IEEE 1580, or section 8 of IEEE 45-2002 (incorporated by reference;...

  10. 46 CFR 111.60-1 - Construction and testing of cable.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...applicable, for cables rated above 5,000 volts. (d) Electrical cable that has a polyvinyl-chloride insulation with a nylon jacket (Type T/N) must meet either UL 1309, IEEE 1580, or section 8 of IEEE 45-2002 (incorporated by reference;...

  11. 49 CFR 236.71 - Signal wires on pole line and aerial cable.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...Cables § 236.71 Signal wires on pole line and aerial cable. Signal wire on pole line shall be securely tied in on insulator properly fastened to crossarm or bracket supported by pole or other support. Signal wire shall not interfere with, or...

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

    NASA Technical Reports Server (NTRS)

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

    1974-01-01

    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.

  13. The effect of the thermal history on the space charge accumulation in HVDC crosslinked polyethylene cables

    Microsoft Academic Search

    P. Carstensen; A. A. Farkas; A. Campus; U. H. Nilsson

    2005-01-01

    Space charge profiles of polymeric high voltage direct current (HVDC) cables measured by pulsed electro-acoustic (PEA) systems are normally asymmetrical. It is observed that the space charges in cable samples are mainly located in the outer part of the insulation with little or no space charge accumulation at the inner semi-conductive layer. The objective of the present work is to

  14. Far-infrared laser scanner for high-voltage-cable inspection

    Microsoft Academic Search

    P. K. Cheo; J. R. Dunphy; M. C. Foster; R. W. Gagnon; L. G. Puffer Jr.; B. B. Silverman

    1982-01-01

    A far infrared (FIR) laser scanner was fabricated and used to simulate the on-line inspection of solid dielectric insulation of high voltage cables employed in underground electric distribution systems. A high speed optical scanner was built to produce a 3600 rotation of a FIR laser beam around the cable at a maximum angular speed of 9000 rpm. A stationary ellipsoidal

  15. 49 CFR 236.71 - Signal wires on pole line and aerial cable.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...Cables § 236.71 Signal wires on pole line and aerial cable. Signal wire on pole line shall be securely tied in on insulator properly fastened to crossarm or bracket supported by pole or other support. Signal wire shall not interfere with, or...

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

    NASA Astrophysics Data System (ADS)

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

    2014-09-01

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

  17. Evaluation of flammability for cable-like polymers

    NASA Technical Reports Server (NTRS)

    Mikado, Tuneo; Akita, Kazuo

    1988-01-01

    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.

  18. Submarine cable route survey

    SciTech Connect

    Herrouin, G.; Scuiller, T.

    1995-12-31

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

  19. 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.

  20. Telecommunications: Coaxial Cables

    NSDL National Science Digital Library

    Bartelt, Terry L. M.

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

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

    NASA Astrophysics Data System (ADS)

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

    2002-08-01

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

  2. Lightning vulnerability of fiber-optic cables.

    SciTech Connect

    Martinez, Leonard E.; Caldwell, Michele

    2008-06-01

    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.

  3. Electrical aging of extruded dielectric cables: a physical model

    Microsoft Academic Search

    J.-P. Crine; C. Dang; J.-L. Parpal

    1996-01-01

    A model is proposed to describe the electrical aging of polymeric cable insulation. It is based on simple thermodynamic concepts in the Eyring theory and supposes that the first step in electrical aging is essentially a molecular process. The authors' model of electrical aging under AC fields supposes that the molecular-chain deformation which will generate submicrocavities in the amorphous region

  4. HALAR fluoropolymer: A versatile insulation material

    NASA Technical Reports Server (NTRS)

    Robertson, A. B.

    1972-01-01

    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.

  5. Determining Remaining Useful Life of Aging Cables in Nuclear Power Plants – Interim Study FY13

    SciTech Connect

    Simmons, Kevin L.; Fifield, Leonard S.; Westman, Matthew P.; Ramuhalli, Pradeep; Pardini, Allan F.; Tedeschi, Jonathan R.; Jones, Anthony M.

    2013-09-27

    The most important criterion for cable performance is its ability to withstand a design-basis accident. With nearly 1000 km of power, control, instrumentation, and other cables typically found in an NPP, it would be a significant undertaking to inspect all of the cables. Degradation of the cable jacket, electrical insulation, and other cable components is a key issue that is likely to affect the ability of the currently installed cables to operate safely and reliably for another 20 to 40 years beyond the initial operating life. The development of one or more nondestructive evaluation (NDE) techniques and supporting models that could assist in determining the remaining life expectancy of cables or their current degradation state would be of significant interest. The ability to nondestructively determine material and electrical properties of cable jackets and insulation without disturbing the cables or connections has been deemed essential. Currently, the only technique accepted by industry to measure cable elasticity (the gold standard for determining cable insulation degradation) is the indentation measurement. All other NDE techniques are used to find flaws in the cable and do not provide information to determine the current health or life expectancy. There is no single NDE technique that can satisfy all of the requirements needed for making a life-expectancy determination, but a wide range of methods have been evaluated for use in NPPs as part of a continuous evaluation program. The commonly used methods are indentation and visual inspection, but these are only suitable for easily accessible cables. Several NDE methodologies using electrical techniques are in use today for flaw detection but there are none that can predict the life of a cable. There are, however, several physical and chemical ptoperty changes in cable insulation as a result of thermal and radiation damage. In principle, these properties may be targets for advanced NDE methods to provide early warning of aging and degradation. Examples of such key indicators include changes in chemical structure, mechanical modulus, and dielectric permittivity. While some of these indicators are the basis of currently used technologies, there is a need to increase the volume of cable that may be inspected with a single measurement, and if possible, to develop techniques for in-situ inspection (i.e., while the cable is in operation). This is the focus of the present report.

  6. Cable and line inspection mechanism

    NASA Technical Reports Server (NTRS)

    Ross, Terence J. (Inventor)

    2003-01-01

    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.

  7. Cable and Line Inspection Mechanism

    NASA Technical Reports Server (NTRS)

    Ross, Terence J. (Inventor)

    2003-01-01

    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.

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

    NASA Astrophysics Data System (ADS)

    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

    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.

  9. Relationship between Statistical Distributions of Impinging and Stressing Overvoltages in Power Cable Lines

    Microsoft Academic Search

    M. Marzinotto

    2007-01-01

    The knowledge of the statistical distribution of the overvoltages stressing the insulation of a cable line is fundamental for the insulation coordination. The estimation of such distributions requires the utilization of complex numerical programs. In this paper a simplified method which takes into account a typical configuration in a power system \\

  10. CISCO MULTISERVICE BROADBAND CABLE GUIDE

    E-print Network

    Westall, James M.

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

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

    NASA Astrophysics Data System (ADS)

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

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

  12. The Discrete Hanging Cable

    ERIC Educational Resources Information Center

    Peters, James V.

    2004-01-01

    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.

  13. Flat conductor cable survey

    NASA Technical Reports Server (NTRS)

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

    1973-01-01

    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.

  14. Shape memory alloy cables

    NASA Astrophysics Data System (ADS)

    Reedlunn, Benjamin; Shaw, John A.

    2008-03-01

    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.

  15. Infiniband Based Cable Comparison

    SciTech Connect

    Minich, Makia [ORNL

    2007-07-01

    As Infiniband continues to be more broadly adopted in High Performance Computing (HPC) and datacenter applications, one major challenge still plagues implementation: cabling. With the transition to DDR (double data rate) from SDR (single datarate), currently available Infiniband implementations such as standard CX4/IB4x style copper cables severely constrain system design (10m maximum length for DDR copper cables, thermal management due to poor airflow, etc.). This paper will examine some of the options available and compare performance with the newly released Intel Connects Cables. In addition, we will take a glance at Intel's dual-core and quad-core systems to see if core counts have noticeable effect on expected IO patterns.

  16. Marine seismic cable connector

    SciTech Connect

    Williams, S. D.

    1985-07-02

    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.

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

    SciTech Connect

    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

    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.

  18. Reusable Hot-Wire Cable Cutter

    NASA Technical Reports Server (NTRS)

    Pauken, Michael T.; Steinkraus, Joel M.

    2010-01-01

    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.

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

    NASA Astrophysics Data System (ADS)

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

    2014-02-01

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

  20. INSULATED BUS PIPE (IBP) FOR POWER UTILITY APPLICATIONS

    Microsoft Academic Search

    R. Worth; Moni Islam; C. Smith

    2006-01-01

    In voluntary compliance of the Homeland Security Act of 2002, power utility substations feeding critical loads must be upgraded to include measures to secure against terrorist attacks. Outdoor, air insulated electrical substations use exposed bus bars and cables to connect from transformers and bus ties to switchgear equipment. A length of chain thrown over an air insulated sub-station fence could

  1. Model of Inception and Growth of Damage from Microvoids in Polyethylene-based Materials for HVDC Cables. 1. Theoretical Approach

    Microsoft Academic Search

    G. Mazzanti; G. C. Montanari; F. Civenni

    2007-01-01

    A comprehensive physical aging and life model is presented for damage inception and growth in polymeric insulation, starting at the level of microscopic cavities, that are known to be one of the most severe factors limiting design electric field and life of cable insulation. Degradation within a polyethylene-based material for HVDC cables is considered as a hot-electron induced bond-breaking process

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

    Microsoft Academic Search

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

    1996-01-01

    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

  3. Insulation Station

    NSDL National Science Digital Library

    Twin Cities Public Television

    2013-01-01

    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.

  4. Far-infrared laser scanner for high-voltage-cable inspection

    SciTech Connect

    Cheo, P.K.

    1982-10-01

    A far-infrared (FIR) laser scanner was fabricated and used to simulate the on-line inspection of solid-dielectric insulation of high-voltage cables employed in underground electric distribution systems. A high-speed optical scanner was built to produce a 360/sup 0/ rotation of a FIR laser beam around the cable at a maximum angular speed of 9000 rpm. A stationary ellipsoidal mirror, which is concentric with the extruded cable, focuses the beam to a spot size of approximately 3 mm inside the cable insulation. In the absence of insulation defects, the beam will pass through the insulation tangentially to the conductor shield without scattering. When defects appear, the beam will be scattered into an angular cone that will be collected by another ellipsoid. The scattered signals, after passing through a high-speed rotating optical tracker, are detected by a liquid-helium-cooled gallium-doped germanium photoconductor. The amplitude and waveform of the scattered signal are analyzed and correlated to the size and type of defects. The smallest detectable defect size in a 25-kV 1/0 cross-linked polyethylene cable is about 50 ..mu..m (2 mils). It has been demonstrated that this instrument is able to detect voids, contaminants, and protrusions as well as defects on the surface of the insulation.

  5. Coaxial cable cutter

    DOEpatents

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

    1990-04-10

    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.

  6. Wide-span cable structures

    E-print Network

    Santoso, Katherina, 1980-

    2004-01-01

    In recent years, the application of cable structures in buildings has gained huge popularities. Although cable technology has been established since the 1950s, there is suddenly a surge in the number of its building ...

  7. Pyrotechnic-actuated cable release

    NASA Technical Reports Server (NTRS)

    Hanson, R. W.

    1968-01-01

    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.

  8. An Internal Coaxial Cable Electrical Connector For Use In Downhole Tools

    DOEpatents

    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

    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.

  9. Power superconducting power transmission cable

    DOEpatents

    Ashworth, Stephen P. (Cambridge, GB)

    2003-01-01

    The present invention is for a compact superconducting power transmission cable operating at distribution level voltages. The superconducting cable is a conductor with a number of tapes assembled into a subconductor. These conductors are then mounted co-planarly in an elongated dielectric to produce a 3-phase cable. The arrangement increases the magnetic field parallel to the tapes thereby reducing ac losses.

  10. George W. Cable and Tradition.

    ERIC Educational Resources Information Center

    Trotman, C. James

    There have been no critical studies of Cable's fiction treated for its own sake; and, without such studies, readers may not become aware of these stories or of their possible value. The absence of a critical position on Cable is due to the decline in his reputation as an artist when he became a writer of popular literature. Before 1925 Cable and…

  11. Cables and connectors: A compilation

    NASA Technical Reports Server (NTRS)

    1974-01-01

    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.

  12. High Temperature Superconducting Underground Cable

    SciTech Connect

    Farrell, Roger, A.

    2010-02-28

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

  13. Cable Pool - Cherryfield

    USGS Multimedia Gallery

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

  14. Multilayer flat electrical cable

    NASA Technical Reports Server (NTRS)

    Silverman, P. G.

    1973-01-01

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

  15. Handbook for photovoltaic cabling

    SciTech Connect

    Klein, D. N.

    1980-08-01

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

  16. Educational Telecommunications. Cable Conference.

    ERIC Educational Resources Information Center

    Michigan State Board of Education, Lansing.

    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)…

  17. Schools and Cable Television.

    ERIC Educational Resources Information Center

    National Education Association, Washington, DC. Educational Technology Div.

    The papers gathered here are designed to provide a foundation of background information for those charged with the responsibility of formulating school district goals regarding cable television (CATV) and of obtaining the necessary cooperation from the local CATV franchise operators to reach these goals. The position of the National Education…

  18. Flat conductor cable handbook

    NASA Technical Reports Server (NTRS)

    Angele, W.; Hankins, J. D.

    1971-01-01

    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.

  19. Flat conductor cable applications

    NASA Technical Reports Server (NTRS)

    Angele, W.

    1972-01-01

    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.

  20. High Temperature Superconducting Cable

    E-print Network

    and reliabilities. · SPI-2: Bixby Substation, AEP, Columbus, OH ­To complete a long length demonstration with AEP · Install 13.2 kV, 3.0 kA (69 MVA) HTS cable system in Bixby substation, about 2 times the power

  1. On conduction-cooling of a high-temperature superconducting cable

    NASA Astrophysics Data System (ADS)

    Posada, Alberto; Kim, Young I.; Manousiouthakis, Vasilios

    2006-06-01

    Current generation high-temperature superconducting (HTS) power transmission cables use liquid nitrogen as a coolant that circulates along the cable. In this work, the use of axial conduction-cooling in attaining HTS temperatures in transmission lines is proposed. Liquid coolant use is envisioned only at periodic length intervals along the transmission lines, in combination with insulation and copper. The proposed concept is feasible due to the high thermal conductivity of pure copper at cryogenic temperatures. A basic design for the insulated cable is proposed and a detailed numerical simulation of heat transfer in such a cable is carried out for various case studies considering the superconducting materials MgB 2 and BSCCO-2223.

  2. Internal coaxial cable seal system

    DOEpatents

    Hall, David R.; Sneddon, Cameron; Dahlgren, Scott Steven; Briscoe, Michael A.

    2006-07-25

    The invention is a seal system for a coaxial cable and is placed within the coaxial cable and its constituent components. A series of seal stacks including load ring components and elastomeric rings are placed on load bearing members within the coaxial cable sealing the annular space between the coaxial cable and an electrical contact passing there through. The coaxial cable is disposed within drilling components to transmit electrical signals between drilling components within a drill string. The seal system can be used in a variety of downhole components, such as sections of pipe in a drill string, drill collars, heavy weight drill pipe, and jars.

  3. Disposable telemetry cable deployment system

    DOEpatents

    Holcomb, David Joseph (Sandia Park, NM)

    2000-01-01

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

  4. Flat conductor cable commercialization project

    NASA Technical Reports Server (NTRS)

    Hogarth, P.; Wadsworth, E.

    1977-01-01

    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.

  5. Inspection methods for underwater cables

    NASA Astrophysics Data System (ADS)

    Noyes, Robin Y.

    1994-12-01

    Underwater cables serve many purposes, both military and commercial. The most common use of underwater cables is for telecommunications, where voice is transformed into either electrical current or pulses of laser light which are transmitted across the world's oceans via underwater cables. The military uses underwater cables in several ways in support of national defense. Hydrophone arrays deployed from underwater cables form an extensive integrated undersea surveillance system (RYSS) which is used to monitor the activities of submannes. The military also uses underwater cables for training, testing, and evaluation ranges in the ocean. These ranges use transponder units to track air, surface, and submerged targets for purposes such as measuring surface ship radiated noise or evaluating weapons systems accuracy. The underwater cables provide the means to transmit communications and data to control facilities.

  6. San Francisco Cable Car Museum

    NSDL National Science Digital Library

    2002-01-01

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

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

    SciTech Connect

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

    1995-12-31

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

  8. Cellulose Insulation

    NASA Technical Reports Server (NTRS)

    1980-01-01

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

  9. Development of Inspection Robots for Bridge Cables

    PubMed Central

    Kim, Se-Hoon; Lee, Jong-Jae

    2013-01-01

    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

  10. Flexible gas-insulated metal-enclosed transmission-system design

    NASA Astrophysics Data System (ADS)

    Kroon, P. J.; Netzel, P. C.; Ponder, J. Z.; Spencer, E. M.

    1982-08-01

    A flexible gas insulated cable for power transmission applications from 138 to 345 kV is described. The use of corugated aluminum for the conductor and sheath permits a bend radius of 8.5 times the cable radius to allow reeling of the cable for shipment of long lengths by truck or rail. The successful installation and test of an earlier prototype cable is also described. A machine to continuously produce corrugated tubing was designed, fabricated and installed in its own building to serve as the basic tool with which to develop methods to permit continuous production of cable. A two piece injection molded insulating spacer was developed to permit continuous economical cable production. Numerous tests have demonstrated the outstanding dielectric properties of the basic material and the sinulator design. A series of tables and graphs is presented to facilitate determination of current carrying capacity under various conditions for above ground and underground installations.

  11. Method to improve superconductor cable

    DOEpatents

    Borden, A.R.

    1984-03-08

    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.

  12. Cable coupling lightning transient qualification

    NASA Technical Reports Server (NTRS)

    Cook, M.

    1989-01-01

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

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

    SciTech Connect

    Bernstein, Robert

    2014-08-01

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

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

    SciTech Connect

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

    2014-09-01

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

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

    SciTech Connect

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

    1996-04-01

    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.

  16. Automatic insulation resistance testing apparatus

    DOEpatents

    Wyant, Francis J.; Nowlen, Steven P.; Luker, Spencer M.

    2005-06-14

    An apparatus and method for automatic measurement of insulation resistances of a multi-conductor cable. In one embodiment of the invention, the apparatus comprises a power supply source, an input measuring means, an output measuring means, a plurality of input relay controlled contacts, a plurality of output relay controlled contacts, a relay controller and a computer. In another embodiment of the invention the apparatus comprises a power supply source, an input measuring means, an output measuring means, an input switching unit, an output switching unit and a control unit/data logger. Embodiments of the apparatus of the invention may also incorporate cable fire testing means. The apparatus and methods of the present invention use either voltage or current for input and output measured variables.

  17. Cable Bundle Wire Derating

    NASA Technical Reports Server (NTRS)

    Lundquist, Ray A.; Leidecker, Henning

    1998-01-01

    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.

  18. Cable Bundle Wire Derating

    NASA Technical Reports Server (NTRS)

    Lundquist, Ray A.; Leidecker, Henning

    1998-01-01

    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.

  19. Development and performance of electrostatic deflector insulators for the Chalk River superconducting cyclotron

    Microsoft Academic Search

    C. R. Hoffmann; J. F. Mouris

    1991-01-01

    The electrostatic deflector in the Chalk River superconducting cyclotron has a dee shape, and has a single fixed deflector electrode suspended from two insulators located above the midplane. One of them contains a high-voltage cable and a series water resistor to limit energy available to a spark and to isolate the high-voltage cable and DC power supply from RF pickup.

  20. Non-Intrusive Cable Tester

    NASA Technical Reports Server (NTRS)

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

    1999-01-01

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

  1. Development of modular cable mesh deployable antenna

    Microsoft Academic Search

    Akira Meguro; Jin Mitsugi; Kazuhide Andou

    1993-01-01

    This report describes a concept and key technologies for the modular mesh deployable antenna. The antenna reflector composed of independently manufactured and tested modules is presented. Each module consists of a mesh surface, a cable network, and a deployable truss structure. The cable network comprises three kinds of cables, surface, tie, and back cables. Adjustment of tie cable lengths improves

  2. Rotating Connection for Electrical Cables

    NASA Technical Reports Server (NTRS)

    Manges, D. R.

    1986-01-01

    Cable reel provides electrical connections between fixed structure and rotating one. Reel carries power and signal lines while allowing rotating structure to turn up to 360 degrees with respect to fixed structure. Reel replaces sliprings. Can be used to electrically connect arm of robot with body. Reel releases cable to rotating part as it turns and takes up cable as rotating part comes back to its starting position, without tangling, twisting, or kinking.

  3. CableLabs: Current Projects

    NSDL National Science Digital Library

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

  4. High-Frequency Modeling of the Long-Cable-Fed Induction Motor Drive System Using TLM Approach for Predicting Overvoltage Transients

    Microsoft Academic Search

    Liwei Wang; Carl Ngai-Man Ho; Francisco Canales; Juri Jatskevich

    2010-01-01

    Induction motor drive systems fed with cables are widely used in many industrial applications. Accurate prediction of motor terminal overvoltage, caused by impedance mismatch between the long cable and the motor, plays an important role for motor dielectric insulation and optimal design of dv\\/dt filters. In this paper, a novel modeling methodology for the investigation of long-cable-fed induction motor drive

  5. Evaluation of the radiation resistance of electrical insulation materials

    NASA Astrophysics Data System (ADS)

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

    2002-12-01

    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.

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

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

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

  7. Rehabilitation of a gassy low pressure liquid filled 115 kV cable

    SciTech Connect

    Gupta, B.K.; Sheerin, G.M. [Ontario Hydro, Toronto, Ontario (Canada)

    1994-12-31

    The recent attempt to degassify a self contained liquid filled (SCLF) cable in Ontario Hydro is described. In September 1989, there was a high pressure alarm on one phase of a SCLF 115 kV cable circuit. The direct buried cable circuit is about 1,890 m long with two joints and was installed in 1968. Oil samples from the cable had 10 to 12% gas content with high levels of hydrogen, methane, and ethane, and very low levels of carbon monoxide, carbon dioxide, and acetylene. From these results it was concluded that the gas was generated by low energy electrical discharges and the paper insulation was not degraded. Various utilities and cable manufacturers were contacted to find if they had experienced similar problems. The cable duct oil was flushed and gasified and the successive oil samples were analyzed in order to locate the gassing site. The joints were examined and oil samples were taken through holes drilled in the cable sheath. From the test results the problem site was located to within 300 m. Because of operational demand on the circuit, the cable was put back in service in May 1990 and is being monitored since then. The problems encountered in the investigation are described and the areas for further research are outlined in the paper.

  8. Cable Television: Notebook Number Five.

    ERIC Educational Resources Information Center

    Notebook, 1973

    1973-01-01

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

  9. Cable Television in Sedalia, Missouri.

    ERIC Educational Resources Information Center

    Lamkin, Kathryn Janel

    A field study was conducted of the status of cable television in Sedalia, Missouri. Based on interviews of city council members and staff members of Cablevision, the Sedalia cable franchise holder, the following issues were investigated: (1) subscription rates; (2) franchise negotiations; (3) quality of existing services; and (4) possible…

  10. Heart catheter cable and connector

    NASA Technical Reports Server (NTRS)

    Harrison, D. R.; Cota, F. L.; Sandler, H.

    1972-01-01

    Ultraminiature catheter cables that are stiff enough for intravenous insertion yet flexible at the tip, sterilizable, and economical are fabricated entirely from commercially available parts. Assembly includes air passageway for reference pressures and coaxial cable for transmission of signals from the tip of catheter.

  11. The optimum spanning catenary cable

    NASA Astrophysics Data System (ADS)

    Wang, C. Y.

    2015-03-01

    A heavy cable spans two points in space. There exists an optimum cable length such that the maximum tension is minimized. If the two end points are at the same level, the optimum length is 1.258 times the distance between the ends. The optimum lengths for end points of different heights are also found.

  12. Ocean bottom seismic cable connector

    Microsoft Academic Search

    G. A. Edgerton; J. H. Engel; H. Ottsen; H. A. Seal; J. F. Wadsworth

    1984-01-01

    A cable connector for connecting marine seismic cables having an electrical conductor and a high tensile strength load transmitting core, comprising a housing having spherical sockets provided in opposite ends thereof, a pair of diametrically opposed grooves extending partially into the inner surface of the spherical sockets and extending longitudinally relative to the housing, strain relief members attached to the

  13. Photonic-powered cable assembly

    DOEpatents

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

    2014-06-24

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

  14. Photonic-powered cable assembly

    DOEpatents

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

    2013-01-22

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

  15. 47 CFR 36.153 - Assignment of Cable and Wire Facilities (C&WF) to categories.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...a) Cable consists of: Aerial cable, underground cable, buried cable, submarine cable, deep sea cable and intrabuilding network cable. Where an entire cable or aerial wire is assignable to one category, its cost and quantity are, where...

  16. 47 CFR 36.153 - Assignment of Cable and Wire Facilities (C&WF) to categories.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

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

  17. 47 CFR 36.153 - Assignment of Cable and Wire Facilities (C&WF) to categories.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

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

  18. 47 CFR 36.153 - Assignment of Cable and Wire Facilities (C&WF) to categories.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

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

  19. 49 CFR 234.243 - Wire on pole line and aerial cable.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...Maintenance Standards § 234.243 Wire on pole line and aerial cable. Wire on a pole line shall be securely attached to an insulator that is properly fastened to a cross arm or bracket supported by a pole or other support. Wire shall not interfere with,...

  20. 49 CFR 234.243 - Wire on pole line and aerial cable.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...Maintenance Standards § 234.243 Wire on pole line and aerial cable. Wire on a pole line shall be securely attached to an insulator that is properly fastened to a cross arm or bracket supported by a pole or other support. Wire shall not interfere with,...

  1. 49 CFR 234.243 - Wire on pole line and aerial cable.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...Maintenance Standards § 234.243 Wire on pole line and aerial cable. Wire on a pole line shall be securely attached to an insulator that is properly fastened to a cross arm or bracket supported by a pole or other support. Wire shall not interfere with,...

  2. 49 CFR 234.243 - Wire on pole line and aerial cable.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...Maintenance Standards § 234.243 Wire on pole line and aerial cable. Wire on a pole line shall be securely attached to an insulator that is properly fastened to a cross arm or bracket supported by a pole or other support. Wire shall not interfere with,...

  3. Far-infrared laser scanner for high-voltage-cable inspection

    NASA Astrophysics Data System (ADS)

    Cheo, P. K.; Dunphy, J. R.; Foster, M. C.; Gagnon, R. W.; Puffer, L. G., Jr.; Silverman, B. B.

    1982-10-01

    A far infrared (FIR) laser scanner was fabricated and used to simulate the on-line inspection of solid dielectric insulation of high voltage cables employed in underground electric distribution systems. A high speed optical scanner was built to produce a 3600 rotation of a FIR laser beam around the cable at a maximum angular speed of 9000 rpm. A stationary ellipsoidal mirror, which is concentric with the extruded cable, focuses the beam to a spot size of approximately 3 mm inside the cable insulation. In the absence of insulation defects, the beam will pass through the insulation tangentially to the conductor shield without scattering. When defects appear, the beam will be scattered into an angular cone that will be collected by another ellipsoid. The scattered signals, after passing through a high speed rotating optical tracker, are detected by a liquid helium cooled gallium doped germanium photoconductor. The amplitude and waveform of the scattered signal are analyzed and correlated to the size and type of defects.

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

    Microsoft Academic Search

    Y. Damchi; J. Sadeh

    2010-01-01

    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

  5. 49 CFR 234.243 - Wire on pole line and aerial cable.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...Maintenance Standards § 234.243 Wire on pole line and aerial cable. Wire on a pole line shall be securely attached to an insulator that is properly fastened to a cross arm or bracket supported by a pole or other support. Wire shall not interfere with,...

  6. Evaluation of dc insulation performance based on space-charge measurements and accelerated life tests

    Microsoft Academic Search

    G. C. Montanari; D. Fabiani

    2000-01-01

    Space charge observation is becoming the most widely used technique to evaluate polymeric materials for dc insulation applications, particularly HV cables. However, quantities are still lacking that can help to summarize and interpret the huge amount of data resulting from space charge measurements, and that also are associated with the electrical performance of the insulation. The purpose of this paper

  7. Space charge formation at interface between polyethylene and other polymeric materials

    Microsoft Academic Search

    H. Miyake; K. Iida; Y. Tanaka; T. Takada; T. Shindo; T. Tanaka

    2003-01-01

    Space charge formation at interfaces between polyethylene and other polymeric materials were observed using a PEA method. Many polymeric materials are proposed to be used as the pre-molded joint for XLPE insulated cables. However, there are few investigations of space charge accumulation at the interface between different polymeric materials. When the space charge is formed at the interface in joint,

  8. Radiation Insulation

    NASA Technical Reports Server (NTRS)

    1995-01-01

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

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

    NASA Astrophysics Data System (ADS)

    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

    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.

  10. Robot cable-compliant devices

    NASA Technical Reports Server (NTRS)

    Kerley, James J., Jr. (inventor)

    1990-01-01

    A cable compliant robotic joint includes two U configuration cross section brackets with their U cross sections lying in different planes, one of their brackets being connected to a robot arm and the other to a tool. Additional angle brackets are displaced from the other brackets at corners of the robotic joint. All the brackets are connected by cable segments which lie in one or more planes which are perpendicular to the direction of tool travel as it approaches a work object. The compliance of the joint is determined by the cable segment characteristics, such as their length, material, angle, stranding, pretwisting, and prestressing.

  11. Insulation Material

    NASA Technical Reports Server (NTRS)

    1984-01-01

    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.

  12. Membranes Improve Insulation Efficiency

    E-print Network

    Bullock, C. A.

    1986-01-01

    membranes over the insulation, and (2) layered membranes between fiber batts to form closed cells in the insulation both dramatically improve the efficiency of the fiber insulation. The efficiency of this insulation will be improved to an even greater degree...

  13. Microsphere insulation systems

    NASA Technical Reports Server (NTRS)

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

    2005-01-01

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

  14. Insulation Material

    NASA Technical Reports Server (NTRS)

    1987-01-01

    Apex Mills Corporation's superinsulators are used by makers of cold weather apparel, parkas, jackets, boots and outdoor gear such as sleeping bags. Their attraction in such applications is that radiant barrier insulation offers excellent warmth retention at minimal weight and bulk.

  15. Static analysis of cable-driven manipulators with non-negligible cable mass

    Microsoft Academic Search

    Kris Kozak; Qian Zhou; Jinsong Wang

    2006-01-01

    This paper addresses the static analysis of cable-driven robotic manipulators with non-negligible cable mass. An approach to computing the static displacement of a homogeneous elastic cable is presented. The resulting cable-displacement expression is used to solve the inverse kinematics of general cable-driven robotic manipulators. In addition, the sag-induced stiffness of the cables is derived. Finally, two sample robotic manipulators with

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

    SciTech Connect

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

    2001-09-07

    '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.

  17. Flat conductor cable design, manufacture, and installation

    NASA Technical Reports Server (NTRS)

    Angele, W.; Hankins, J. D.

    1973-01-01

    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.

  18. Charge-Dissipative Electrical Cables

    NASA Technical Reports Server (NTRS)

    Kolasinski, John R.; Wollack, Edward J.

    2004-01-01

    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.

  19. Complete book of insulating

    SciTech Connect

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

    1980-01-01

    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.

  20. Insulators for high voltages

    Microsoft Academic Search

    Looms; J. S. T

    1987-01-01

    This book describes electrical insulators for high voltage applications. Topics considered include the insulating materials, the manufacture of wet process porcelain, the manufacture of tempered glass, the glass-fibre core, the polymeric housing, the common problem - terminating an insulator, mechanical constraints, the physics of pollution flashover, the physics of contamination, testing of insulators, conclusions from testing, remedies for flashover, insulators

  1. 7 CFR 1755.507 - Aerial cable services.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...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...

  2. 7 CFR 1755.507 - Aerial cable services.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...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...

  3. 7 CFR 1755.507 - Aerial cable services.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...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...

  4. 7 CFR 1755.507 - Aerial cable services.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...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...

  5. 7 CFR 1755.507 - Aerial cable services.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...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...

  6. Arc Testing of a Mockup Cable in a Simulated Space Radiation Environment

    NASA Technical Reports Server (NTRS)

    Ferguson, D. C.; Schneider, T. A.; Vaughn, J. A.

    2007-01-01

    A mockup cable was irradiated with electrons of 25-100 keV energy in a vacuum chamber. The m'ockup cable consisted of insulated wires on a kapton substrate, overlaid with a metallized teonex shield. Voltages induced on the wires and shield by the electron beam during irradiation were monitored, and voltage changes were used, along with video, to detect arcs due to the charge built-up in the cable. The cable was also cooled with liquid nitrogen to very low temperatures, to simulate cables kept in the dark for long periods of time. Arcing was common at fluences typical of long space missions. Occasionally an arc would occur some time after the electron beam was turned off. The conductivity of the wires and shield was monitored as a function of temperature, and behaved as expected, with lower conductivities at lower temperatures. Arcs from the wires and shield to ground and from the wires to the shield were measured. Sympathetic arcs were also seen, wherein an arc from the shield to ground or from the wires to ground was followed in a short period of time by another arc of a different type. Implications of these results for real cables on long space missions will be discussed, and recommendations given for arc mitigation.

  7. Evaluation of Cable Harness Post-Installation Testing. Part B

    NASA Technical Reports Server (NTRS)

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

    2011-01-01

    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.

  8. Online Cable Tester and Rerouter

    NASA Technical Reports Server (NTRS)

    Lewis, Mark; Medelius, Pedro

    2012-01-01

    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.

  9. Dynamic monitoring of stay cables by enhanced cable equations

    NASA Astrophysics Data System (ADS)

    Yu, Chih-Peng; Hsu, Keng-Tsang; Chiang, Chih-Hung; Cheng, Chia-Chi

    2014-03-01

    In a typical vibration test of tensioned cables, tension forces are mostly estimated from theory of a vibrating string with the first natural frequency. To obtain slightly better estimations, formulas based on an axially loaded beam can be employed. However, uncertainty on both flexural rigidity and effective length of the vibrating cable raise difficulty in reliably determining the possible range of the tension value. From the previous work of the authors, an alternative approach for the calculation of tension forces without the need of rigidity data had been proposed, in which frequencies of high modes are instead required in recovering accurate results. This paper extends the previous work to also consider the discrepancy between the design length and effective length so as to further improve the results. Feasibility of the proposed methodology with enhanced equations was verified by actual cable forces measured in an extradosed bridge. Current study aims to apply the proposed approach to the dynamic monitoring of the in-situ stay cables so as to improve the traditional assessment results without increasing the testing costs.

  10. Establishing a Benthic Cabled Observatory with ROV Based Cable Deployment

    Microsoft Academic Search

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

    2006-01-01

    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

  11. Data Base On Cables And Connectors

    NASA Technical Reports Server (NTRS)

    Bowen, Arlen R.; Oliver, John D.

    1995-01-01

    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.

  12. Design optimization of cable-stayed bridges

    E-print Network

    Bessas, Georgios

    2006-01-01

    The goal of this thesis is to achieve a basic understanding of cable-stayed systems. Issues to be treated are the diachronic evolution of cable-stayed bridges, including the advantages, the limitations and the basic design ...

  13. Folding tools for flat conductor cable harnesses

    NASA Technical Reports Server (NTRS)

    Loggins, R.

    1971-01-01

    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.

  14. Manufacture of flat-conductor cable

    NASA Technical Reports Server (NTRS)

    Angele, W.

    1976-01-01

    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.

  15. Debris protection cover assembly for cable connectors

    NASA Technical Reports Server (NTRS)

    Yovan, Roger D. (Inventor)

    1999-01-01

    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.

  16. Ames Lab 101: Reinventing the Power Cable

    SciTech Connect

    Russell, Alan

    2013-09-27

    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

  17. Ames Lab 101: Reinventing the Power Cable

    ScienceCinema

    Russell, Alan

    2014-06-04

    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

  18. Multi-frequency cable vibration experiments

    E-print Network

    Wiggins, Andrew (Andrew Dale)

    2005-01-01

    A series of Multi-Frequency cable vibration experiments at Reynolds number 7600 were carried out at the MIT Tow Tank using the Virtual Cable Towing Apparatus (VCTA). Motions observed in a Direct Numerical Simulation of a ...

  19. 14 CFR 25.689 - Cable systems.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...2013-01-01 false Cable systems. 25.689 Section...and Construction Control Systems § 25.689 Cable...used in the aileron, elevator, or rudder systems; and (2) Each...not be used in the control system....

  20. 14 CFR 25.689 - Cable systems.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...2010-01-01 false Cable systems. 25.689 Section...and Construction Control Systems § 25.689 Cable...used in the aileron, elevator, or rudder systems; and (2) Each...not be used in the control system....

  1. 14 CFR 25.689 - Cable systems.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...2014-01-01 false Cable systems. 25.689 Section...and Construction Control Systems § 25.689 Cable...used in the aileron, elevator, or rudder systems; and (2) Each...not be used in the control system....

  2. 14 CFR 25.689 - Cable systems.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...2011-01-01 false Cable systems. 25.689 Section...and Construction Control Systems § 25.689 Cable...used in the aileron, elevator, or rudder systems; and (2) Each...not be used in the control system....

  3. 14 CFR 25.689 - Cable systems.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...2012-01-01 false Cable systems. 25.689 Section...and Construction Control Systems § 25.689 Cable...used in the aileron, elevator, or rudder systems; and (2) Each...not be used in the control system....

  4. NEMA wire and cable standards development programs

    NASA Technical Reports Server (NTRS)

    Baird, Robert W.

    1994-01-01

    The National Electrical Manufacturers Association (NEMA) is the nation's largest trade association for manufacturers of electrical equipment. Its member companies produce components, end-use equipment and systems for the generation, transmission, distribution, control and use of electricity. The wire and cable division is presented in 6 sections: building wire and cable, fabricated conductors, flexible cords, high performance wire and cable, magnet wire, and power and control cable. Participating companies are listed.

  5. FOA Lecture 4: Fiber Optic Cables

    NSDL National Science Digital Library

    Hayes, Jim

    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.

  6. Hawaii Deep Water Cable Program: Executive Summary

    SciTech Connect

    None

    1990-09-01

    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.

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

    SciTech Connect

    Zhai, Yuhu

    2013-07-16

    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.

  8. Tank Insulation

    NASA Technical Reports Server (NTRS)

    1979-01-01

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

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

    NASA Technical Reports Server (NTRS)

    Mc Crae, A. W., Jr.

    1967-01-01

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

  10. Intrepid MicroTrack leaky cable sensor

    Microsoft Academic Search

    R. Keith Harman

    2002-01-01

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

  11. Remote Acquisition Amplifier For 50-Ohm Cable

    NASA Technical Reports Server (NTRS)

    Amador, Jose J.

    1995-01-01

    Buffer-amplifier unit designed to drive 50-Ohm cables up to 100 ft. (30 m) long, compensating for attenuation in cables and enabling remote operation of oscilloscopes. Variable resistor provides for adjustment of gain of amplifier, such that overall gain from input terminals of amplifier to output end of cable set to unity.

  12. Your Personal Genie in the Cable.

    ERIC Educational Resources Information Center

    Schlafly, Hubert J.

    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…

  13. 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

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

    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…

  14. ALOHA Cabled Observatory: Early Results

    NASA Astrophysics Data System (ADS)

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

    2011-12-01

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

  15. Perceptions of Cable Public Access.

    ERIC Educational Resources Information Center

    Banks, Mark J.; Porter, Gregory S.

    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…

  16. Selecting a Cable System Operator.

    ERIC Educational Resources Information Center

    Cable Television Information Center, Washington, DC.

    Intended to assist franchising authorities with the process of selecting a cable television system operator from franchise applicants, this document provides a framework for analysis of individual applications. Section 1 deals with various methods which can be used to select an operator. The next section covers the application form, the vehicle a…

  17. Library Clout in Local Cable.

    ERIC Educational Resources Information Center

    Smith, Don R.

    1981-01-01

    Describes the role of the Monroe County Public Library in Bloomington, Indiana, in the development of a Community Access Channel through a local cable television (CATV) franchise. The services offered on the channel, the resources required, and the potential of the channel as a community communications resource are outlined. (JL)

  18. 300 Area signal cable study

    SciTech Connect

    Whattam, J.W.

    1994-09-15

    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.

  19. Interactive Cable Television. Final Report.

    ERIC Educational Resources Information Center

    Active Learning Systems, Inc., Minneapolis, MN.

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

  20. Bi:2212/Ag-based Rutherford cables: production, processing and properties

    NASA Astrophysics Data System (ADS)

    Collings, E. W.; Sumption, M. D.; Scanlan, R. M.; Dietderich, D. R.; Motowidlo, L. R.; Sokolowski, R. S.; Aoki, Y.; Hasegawa, T.

    1999-02-01

    The fabrication of Bi:2212/Ag-based Rutherford-type accelerator cables, their transport critical current 0953-2048/12/2/006/img10 testing and ac loss measurement are described. Multifilamentary strands were used to form several cables with 18-19 strands and a lay pitch, 0953-2048/12/2/006/img11 (half the transposition pitch) of 27.5 mm. The inclusion of a metallic alloy core was proposed for mechanical strength, the limiting of cable winding damage and ac loss/residual magnetization mitigation. Single-strand measurements of `poisoning' from several candidate core materials are reported, as well as the influences of winding pitch and thermal shock degradation on 0953-2048/12/2/006/img12. Nichrome 80 was selected as a core material on the basis of ready availability in strip form and its initially observed inertness from a poisoning standpoint. In-cable single-strand studies indicated that winding damage could degrade edge-measured 0953-2048/12/2/006/img12 by about 16%. Full cable 0953-2048/12/2/006/img12 measurements demonstrated that core-induced poisoning could reduce 0953-2048/12/2/006/img12 by a further 35-40%. Ac loss measurements on a series of specially designed cables showed that the core (either bare or coated) effectively insulated the strands against crossover contact. This, together with the fact that the cable had been only lightly compacted (thereby ensuring moderate but not strong side-by-side contact) allowed the effective interstrand contact resistance of a projected Bi:2212/Ag-wound core-type LHC Rutherford cable to fall close to the acceptability range for the windings of accelerator magnets.

  1. Insulation Coordination for Gas Insulated Substations

    Microsoft Academic Search

    Helfried Anderl; Charles Wagner; Thomas Dodds

    1973-01-01

    This paper presents the development of BIL (Basic Lightning Impulse Insulation Level) ratings for SF6 gas insulated substations from 72.5 kV to 765 kV. The unique properties of the gas insulated substation are analyzed and insulation coordination design techniques are utilized to determine BIL ratings for the substation equipment, other than the transformer, with a lightning arrester located at the

  2. Analysis of Surveyor 3 television cable after residence on the moon

    NASA Technical Reports Server (NTRS)

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

    1972-01-01

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

  3. Development of modular cable mesh deployable antenna

    NASA Astrophysics Data System (ADS)

    Meguro, Akira; Mitsugi, Jin; Andou, Kazuhide

    1993-03-01

    This report describes a concept and key technologies for the modular mesh deployable antenna. The antenna reflector composed of independently manufactured and tested modules is presented. Each module consists of a mesh surface, a cable network, and a deployable truss structure. The cable network comprises three kinds of cables, surface, tie, and back cables. Adjustment of tie cable lengths improves the surface accuracy. Synchronous deployment truss structures are considered as a supporting structure. Their design method, BBM's (Bread Board Model) and deployment analysis are also explained.

  4. Testing flat-conductor cable

    NASA Technical Reports Server (NTRS)

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

    1976-01-01

    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.

  5. Self-healing cable apparatus and methods

    NASA Technical Reports Server (NTRS)

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

    2007-01-01

    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.

  6. A novel calibration method for PD measurements in power cables and joints using capacitive couplers

    Microsoft Academic Search

    L. Zhong; G. Chen; Y. Xu

    2004-01-01

    Partial discharge (PD) measurements are universally accepted as a technique giving some indication of the state of the insulation in high-voltage apparatus. Cable end users are keen to adopt online PD monitoring during commissioning of systems. However, because of noisy environments and the problems of interference the conventional methods are difficult to implement. As a consequence, ultra-high frequency (UHF)\\/very high

  7. Calcium silicate insulation structure

    DOEpatents

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

    1995-01-01

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

  8. Multiple density layered insulator

    DOEpatents

    Alger, Terry W. (Tracy, CA)

    1994-01-01

    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.

  9. Insulation Materials Investigation

    NSDL National Science Digital Library

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

    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.

  10. Multiple density layered insulator

    DOEpatents

    Alger, T.W.

    1994-09-06

    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.

  11. Insulation Characteristics of Bushing Shed at Cryogenic Temperature

    NASA Astrophysics Data System (ADS)

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

    2014-05-01

    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.

  12. Tubing and cable cutting tool

    NASA Technical Reports Server (NTRS)

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

    1984-01-01

    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.

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

    NASA Technical Reports Server (NTRS)

    Ralph, John

    1992-01-01

    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.

  14. Changes In Isomeric Composition of Lab Cable Oil Associated With A Range of Terminal Electron Acceptors

    NASA Astrophysics Data System (ADS)

    Johnson, S. J.; Christofi, N.; Barry, D. A.

    Synthetic linear alkylbenzenes (LABs) are used as insulating oils in underground elec- tricity transmission cables. Following accidental damage to the cables or a failure of the cable system, oil may leak into the surrounding soil. The cable is normally repaired quickly and the majority of the oil is recovered, but access to soil containing residual contamination may be hampered by proximity to other buried services, so minimally invasive techniques for remediation are sought. Laboratory experiments have been de- signed to investigate LAB degradation under anaerobic conditions, as these may exist in the field. Preliminary results indicate, for the first time, that microbial growth can occur with nitrate as a terminal electron acceptor and LAB as the sole carbon source. LAB degradation was not evident under sulphate-reducing and methanogenic condi- tions. GC-MS data show that the isomeric composition of oil degraded under nitrate- reducing conditions is altered in a way that differs significantly from oil that has been degraded by aerobic microorganisms. Ongoing work, aimed at confirming these find- ings, includes repetition of the flask culture experiments, greater replication and the inclusion of an internal GC standard to allow the degradation to be fully quantified. Cable-oil degrading microorganisms will be isolated and identified, and the pathways of degradation delineated.

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

    NASA Astrophysics Data System (ADS)

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

    2012-04-01

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

  16. Thermal insulating capabilities of "thin" clothing insulation.

    PubMed

    Kaufman, W C; Bothe, D J

    1985-10-01

    Claims have been made that certain "thin" polyolefin clothing insulating materials possess superior insulating capabilities because they consist of extremely fine fibers. In a comparative study, swatches of the usual clothing materials, down, polyester, and polyolefin were examined by a technique that allowed two methods of calculating the insulation value, one across the sample and the second from the inner surface of the sample to the ambient air. The second method produces a value that includes the air layer which adheres to all clothing, increasing the apparent insulation. The thermal insulation of the material, per se, does not change. The data demonstrate that the claims can be made for any thin insulation. PMID:4062767

  17. System for stabilizing cable phase delay utilizing a coaxial cable under pressure

    NASA Technical Reports Server (NTRS)

    Clements, P. A. (inventor)

    1974-01-01

    Stabilizing the phase delay of signals passing through a pressurizable coaxial cable is disclosed. Signals from an appropriate source at a selected frequency, e.g., 100 MHz, are sent through the controlled cable from a first cable end to a second cable end which, electrically, is open or heavily mismatched at 100 MHz, thereby reflecting 100 MHz signals back to the first cable end. Thereat, the phase difference between the reflected-back signals and the signals from the source is detected by a phase detector. The output of the latter is used to control the flow of gas to or from the cable, thereby controlling the cable pressure, which in turn affects the cable phase delay.

  18. 46 CFR 111.60-5 - Cable installation.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

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

  19. 46 CFR 111.60-5 - Cable installation.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

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

  20. 46 CFR 111.60-5 - Cable installation.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

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

  1. 46 CFR 111.60-5 - Cable installation.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

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

  2. Thin cable system for ROV and AUV in JAMSTEC

    Microsoft Academic Search

    T. Murashima; T. Aoki; S. Tsukioka; T. Hyakudome; H. Yoshida; H. Nakajoh; S. Ishibashi; R. Sasamoto

    2003-01-01

    The ROVs with thin cable system have been developed in JAMSTEC. The thin cable system is very convenient for AUVs, therefore it has been applied for the AUVs that have been developed in JAMSTEC. Conventional ROV systems need the thick cable to supply electric power from mother ship to under-sea vehicle. In the thin cable system, a thick cable is

  3. 21 CFR 890.1175 - Electrode cable.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

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

  4. 21 CFR 890.1175 - Electrode cable.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

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

  5. Vincennes University: Pioneer in Cable TV

    ERIC Educational Resources Information Center

    Beckes, Isaac K.

    1972-01-01

    The development of cable educational television at Vincennes University (Indiana) is discussed in terms of the financing, securing of franchises, educational goals and plans for future expansion. (RN)

  6. Laboratory testing for enhanced undersea cable survivability

    SciTech Connect

    Stange, W.F.

    1983-01-01

    Examples of useful testing procedures with summaries of test results gleaned from years of cable testing experience illustrate how laboratory testing has identified failure modes, uncovered design deficiencies, characterized performance and supported system design for improved at-sea survivability. Repeated test results give insight into the performance capabilities and limitations of contemporary cables with metal and aramid strength members and demonstrate that successful at-sea performance invariably depends upon the effective mating of cable, attachment hardware and handling equipment. Analysis of the potentially high cost of cable failure at sea clearly demonstrates that it pays to test in the laboratory.

  7. MIC-Large Scale Magnetically Inflated Cable Structures for Space Power, Propulsion, Communications and Observational Applications

    NASA Astrophysics Data System (ADS)

    Powell, James; Maise, George; Rather, John

    2010-01-01

    A new approach for the erection of rigid large scale structures in space-MIC (Magnetically Inflated Cable)-is described. MIC structures are launched as a compact payload of superconducting cables and attached tethers. After reaching orbit, the superconducting cables are energized with electrical current. The magnet force interactions between the cables cause them to expand outwards into the final large structure. Various structural shapes and applications are described. The MIC structure can be a simple flat disc with a superconducting outer ring that supports a tether network holding a solar cell array, or it can form a curved mirror surface that concentrates light and focuses it on a smaller region-for example, a high flux solar array that generates electric power, a high temperature receiver that heats H2 propellant for high Isp propulsion, and a giant primary reflector for a telescope for astronomy and Earth surveillance. Linear dipole and quadrupole MIC structures are also possible. The linear quadrupole structure can be used for magnetic shielding against cosmic radiation for astronauts, for example. MIC could use lightweight YBCO superconducting HTS (High Temperature Superconductor) cables, that can operate with liquid N2 coolant at engineering current densities of ~105 amp/cm2. A 1 kilometer length of MIC cable would weigh only 3 metric tons, including superconductor, thermal insulations, coolant circuits, and refrigerator, and fit within a 3 cubic meter compact package for launch. Four potential MIC applications are described: Solar-thermal propulsion using H2 propellant, space based solar power generation for beaming power to Earth, a large space telescope, and solar electric generation for a manned lunar base. The first 3 applications use large MIC solar concentrating mirrors, while the 4th application uses a surface based array of solar cells on a magnetically levitated MIC structure to follow the sun. MIC space based mirrors can be very large and light in weight. A 300 meter diameter MIC mirror in orbit for example, would weigh 20 metric tons and MIC structures can be easily developed and tested on Earth at small scale in existing evacuated chambers followed by larger scale tests in the atmosphere, using a vacuum tight enclosure on the small diameter superconducting cable to prevent air leakage into the evacuated thermal insulation around the superconducting cable.

  8. IEEE 1202 flame testing of cables for use in cable tray

    Microsoft Academic Search

    J. M. Daly

    1991-01-01

    The new IEEE 1202, IEEE Standard for Flame Testing of Cables for Use in Cable Tray in Industrial and Commercial Occupancies, is described. This flame test standard will: (1) contribute to harmonization of Canadian and US standards, most likely becoming a North American standard and eventually replacing the current UL and CSA tray cable flame tests; (2) provide more flame

  9. Maximum modal damping of cable space vibration control with visco damper in cable-stayed bridge

    Microsoft Academic Search

    Bing Nan Sun; Shuid S. Chen; Wen Juan Lou

    2003-01-01

    Taking the bending stiffness, cable static sag and cable inclinded angle into consideration, the equations of space vibration of the cable-damper system are formulted in this paper. Applying the variable separation strategy and center difference method, the partial differential equations are discrete in space and a set of complex eigenvalue equations are sovled by state space method. Then both the

  10. Derating factor for cable crossings with consideration of longitudinal heat flow in cable screen

    Microsoft Academic Search

    George J. Anders; Eric Dorison

    2004-01-01

    In this paper, an extension of the previously published method for the calculation of the derating factors for cables crossing external heat sources is proposed. The extension takes into account the longitudinal heat flow in cable metallic screen. The proposed algorithm is illustrated in a numerical example considering a practical situation of a high voltage cable crossing a steam pipe.

  11. Aging analyses of aircraft wire insulation

    SciTech Connect

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

    2000-05-08

    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.

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

    SciTech Connect

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

    2013-05-01

    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.

  13. Hitching of cable drawn implements

    E-print Network

    Harrison, Carl Randall

    1988-01-01

    typical tillage study. . . 2 Draft and vertical forces of lister bottoms. . . 3 Variable scale factor s for I/6 scale model. . . . 13 43 53 4 Size distribution of silica sand used in the soil bin. . . . 54 5 Analysis of variance of model disk harrow... in Figure 1. The operation of the system proceeds as follows: (1) With the implement starting at anchor end of the system, it is towed to the stationary power unit by a cable. (2) The implement is raised out of the ground. (3) Next, the entire system...

  14. 14 CFR 23.1365 - Electric cables and equipment.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...That equipment and the electrical cables must not emit dangerous quantities of toxic fumes. (c) Main power cables (including generator cables) in the fuselage must be designed to allow a reasonable degree of deformation and stretching...

  15. 14 CFR 23.1365 - Electric cables and equipment.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...That equipment and the electrical cables must not emit dangerous quantities of toxic fumes. (c) Main power cables (including generator cables) in the fuselage must be designed to allow a reasonable degree of deformation and stretching...

  16. 14 CFR 23.1365 - Electric cables and equipment.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...That equipment and the electrical cables must not emit dangerous quantities of toxic fumes. (c) Main power cables (including generator cables) in the fuselage must be designed to allow a reasonable degree of deformation and stretching...

  17. 14 CFR 23.1365 - Electric cables and equipment.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...That equipment and the electrical cables must not emit dangerous quantities of toxic fumes. (c) Main power cables (including generator cables) in the fuselage must be designed to allow a reasonable degree of deformation and stretching...

  18. 14 CFR 23.1365 - Electric cables and equipment.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...That equipment and the electrical cables must not emit dangerous quantities of toxic fumes. (c) Main power cables (including generator cables) in the fuselage must be designed to allow a reasonable degree of deformation and stretching...

  19. 47 CFR 32.6426 - Intrabuilding network cable expense.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

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

  20. 47 CFR 32.6426 - Intrabuilding network cable expense.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 false Intrabuilding network cable expense. 32.6426 Section...Accounts § 32.6426 Intrabuilding network cable expense. (a) This account...expenses associated with intrabuilding network cable. (b) Subsidiary record...

  1. Fibrous refractory composite insulation

    NASA Technical Reports Server (NTRS)

    Goldstein, H. E.; Smith, M.; Leiser, D. B.

    1974-01-01

    Family of high-temperature, low-density refractory composite insulations made from aluminoborosilicate and silica fibers has insulating material with improved mechanical and thermal properties. Composition is useful for reusable heat-shield materials.

  2. Silica reusable surface insulation

    NASA Technical Reports Server (NTRS)

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

    1976-01-01

    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).

  3. Performance of a technical and economical feasibility study of an HVDC compressed gas insulated transmission line. [600 kV

    SciTech Connect

    LaBarge, R.L.

    1980-12-15

    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 20-ft length can be assembled complete outside the test tank. Components to extend the test tank to accommodate a 20-ft model cable have been obtained. A report was drafted on the effect of material selection as well as processing into insulators on the long-term dielectric performance of the insulator. The vertical leaf expansion joint design was improved by replacing the Alcuplate copper-to-aluminum transition piece with nickel plating on the aluminum parts. The joint was fatigue tested with condition which simulate almost 2 1/2 cycles of temperature excursions each day for the 40 year design life of the line. Electrical tests of the joint are in progress.

  4. Thermal insulating mat

    SciTech Connect

    May, M. G.

    1985-08-06

    In order to fabricate and emplace a thermal insulating mat at favorable cost and in order to provide the mat with good thermal insulation properties at a favorable cost, the thermal insulating mat comprises films having sealed chambers which are filled with a filler gas, the thermal conduction coefficient of which is smaller than that of air.

  5. Topological Insulators & Superconductors

    E-print Network

    Topological Insulators & Superconductors New Frontiers in Low-Dimensional Systems Program 3-5 November 2010 Jadwin Hall, Fourth Floor, Room 407 Topological Insulators and Superconductors have quickly Insulators and Superconductors will gather the world- leading researchers in this field to present recent

  6. Increasing lead burden correlates with externalized cables during systematic fluoroscopic screening of Riata leads

    PubMed Central

    Moorman, Liza P.; Moorman, J. Randall; DiMarco, John P.; Malhotra, Rohit; Darby, Andrew; Bilchick, Kenneth; Ferguson, John D.; Mangrum, J. Michael; Kamath, Sandeep

    2014-01-01

    Purpose Riata and Riata ST defibrillator leads (St. Jude Medical, Sylmar, CA, USA) have been recalled due to increased risk of insulation failure leading to externalized cables. As this mechanical failure does not necessarily correlate with electrical failure, it can be difficult to diagnose. Fluoroscopic screening can identify insulation failure. Studies have suggested that insulation failure is predominantly seen in 8-Fr, single-coil models. Our patients have exclusively dual-coil leads and a high proportion of 7-Fr leads. Methods Fluoroscopic screening was performed in 48 patients with recalled Riata leads. Twenty-three patients had 8-Fr Riata leads and 25 patients had 7-Fr Riata ST leads. Images were recorded in at least three projections and studies were reviewed by seven attending electrophysiologists. Results Externalized cables were seen in ten patients (21 %), and another five patients (10 %) had abnormal cable spacing. All device interrogations showed normal parameters. Patients with abnormal leads had more leads in situ (2.5±0.7 vs. 1.6±0.8 leads; P=0.002) and a higher rate of nonischemic cardiomyopathy (80 vs. 24 %; P=0.03). There were no differences between the groups with regards to patient age, body mass index, lead age, lead parameters, or vascular access site. There was no difference with regard to lead size (P=0.76). Conclusions The Riata family of leads has a high incidence of mechanical failure, as demonstrated on fluoroscopic screening. In this study, the 7-Fr models were just as likely to mechanically fail as the 8-Fr models. Increasing lead burden and a diagnosis of nonischemic cardiomyopathy correlated with insulation failure. PMID:23254319

  7. Local Government Uses of Cable Television.

    ERIC Educational Resources Information Center

    Cable Television Information Center, Washington, DC.

    The local government cable access channel is essentially a television station completely controlled by the local government. It differs from a local broadcast television station by being able to reach only those places which are connected to the cable system, having much less programming distribution costs, and having the capacity to deliver…

  8. Community Cable Television--Hungarian Perspectives.

    ERIC Educational Resources Information Center

    Szekfu, Andras

    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…

  9. Cable Television and Educational Access: A Reconsideration.

    ERIC Educational Resources Information Center

    Thornton, Lee R.; Greene, James C.

    1986-01-01

    Considers the possible impact of recent federal legislation on educational utilization of cable television. Stresses the importance of educators understanding the law's provisions and acting to initiate relationships with cable companies. Reviews public educational or governmental access provisions. Presents strategies for promoting reciprocity…

  10. Aerodynamics modeling of towed-cable dynamics

    Microsoft Academic Search

    S. W. Kang; V. R. Latorre

    1991-01-01

    The dynamics of a cable\\/drogue system being towed by an orbiting aircraft has been investigated as a part of an LTWA project for the Naval Air Systems Command. We present here a status report on the tasks performed under Phase 1. We have accomplished the following tasks under Phase 1: A literature survey on the towed-cable motion problem has been

  11. Broadband Connection DSL vs. Cable Modem

    E-print Network

    Riabov, Vladimir V.

    today. Some of those means are television, telephone and Internet access. The definition of broadband. The always-on connection allows a user to fax or talk on the telephone without interfering, provide Internet access through the coaxial cable that delivers cable TV signals, so the conventional

  12. The Status of Cable Communications in Libraries.

    ERIC Educational Resources Information Center

    Kenney, Brigitte L.

    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 communications as an opportunity to gain credibility and visibility, and also as an extension of…

  13. Submerged Repeaters for Long Submarine Telegraph Cables

    Microsoft Academic Search

    C. H. Cramer

    1951-01-01

    An experimental underwater repeater recently installed in one of The Western Union Telegraph Company's transatlantic nonloaded telegraph cables increased the operating speed of the cable from 50 words per minute to 167 words per minute. The repeater is located 170 miles at sea in a depth of 270 fathoms which places it beyond shallow coastal waters where disturbance levels are

  14. Cable Television: The Process of Franchising.

    ERIC Educational Resources Information Center

    Johnson, Leland L.; Botein, Michael

    In an effort to insure that cable television franchising procedures at the local level are based on a competitive and well-conceived selection process, this report discusses some of the most important steps of the franchising process. Not only does it show how the community should assess its needs and appraise the merits of the cable operator, but…

  15. An ACLU Guide to Cable Television.

    ERIC Educational Resources Information Center

    Powledge, Fred

    Proceeding from the hypothesis that cable television (CATV) is one of the most significant developments in modern America, this booklet examines the medium itself and then devotes special attention to the capacity of CATV to serve the First Amendment interest in diversity of expression. The opening section deals with the size and growth of cable,…

  16. Instruction: Cable and Slow-Scan. Workshop.

    ERIC Educational Resources Information Center

    Pachuta, Jack

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

  17. Cable in Boston; A Basic Viability Report.

    ERIC Educational Resources Information Center

    Hauben, Jan Ward; And Others

    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…

  18. Aging of extruded dielectric power cables: Theory

    Microsoft Academic Search

    J. P. Crine; C. Dang; J. L. Parpal

    1992-01-01

    The objective of this study was to seek to develop a reliable aging model of extruded cables. From a review of existing theories and experimental data, it is deduced that the rate theory, modified to take into account some elements of the Zhurkov and Zeller theories, could describe the electrical aging of extruded cables. The proposed model relies on two

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

    PubMed Central

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

    2014-01-01

    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. PMID:25050400

  20. An Internal Coaxil Cable Seal System

    DOEpatents

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

    2004-12-23

    The invention is a seal system for a coaxial cable more specifically an internal seal system placed within the coaxial cable and its constituent components. A series of seal stacks including flexible rigid rings and elastomeric rings are placed on load bearing members within the coaxial cable. The current invention is adapted to seal the annular space between the coaxial cable and an electrical contact passing there through. The coaxial cable is disposed within drilling components to transmit electrical signals between drilling components within a drill string. During oil and gas exploration, a drill string can see a range of pressures and temperatures thus resulting in multiple combinations of temperature and pressure and increasing the difficulty of creating a robust seal for all combinations. The seal system can be used in a plurality of downhole components, such as sections of pipe in a drill string, drill collars, heavy weight drill pipe, and jars.

  1. A Study on the Body Insulators for the Bushing for HTS Devices at Cryogenic Temperature

    NASA Astrophysics Data System (ADS)

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

    A bushing for high temperature superconducting devices (HTS bushing) is important because of applying high voltage to the cable or the winding of the transformer. It is cooled with liquid nitrogen (LN2) and is insulated with various insulators. For the development of the HTS bushing, it is necessary to know the fundamental characteristics of various insulators at cryogenic temperature. The electrical characteristics of the breakdown were studied under AC and impulse voltages. Also, the mechanical characteristics such as tensile strength in air and LN2 were studied. It was confirmed that GFRP is excellent not only electrical characteristics but also mechanical characteristics in LN2.

  2. Self-healing cable for extreme environments

    NASA Technical Reports Server (NTRS)

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

    2009-01-01

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

  3. Cable-catenary large antenna concept

    NASA Astrophysics Data System (ADS)

    Akle, W.

    1985-04-01

    Deployable to very large diameters (over 1000 ft), while still remaining compatible with a complete satellite system launch by STS, the cable-catenary antenna comprises: 8 radial deployable boom masts; a deployable hub and feed support center mast; balanced front and back, radial and circumferential catenary cabling for highly accurate (mm) surface control; no interfering cabling in the antenna field; and an RF reflecting mesh supported on the front catenaries. Illustrations show the antenna-satellite system deployed and stowed configurations; the antenna deployment sequence; the design analysis logic; the sizing analysis output, and typical parametric design data.

  4. Topological insulators/Isolants topologiques An introduction to topological insulators

    E-print Network

    Paris-Sud XI, Université de

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

  5. Insulator-insulator contact charging as a function of pressure

    Microsoft Academic Search

    Michael Duane Hogue

    2005-01-01

    Metal - metal and to an extent metal - insulator contact or triboelectric charging are well known phenomena with good theoretical understanding of the charge exchange mechanism. However, insulator - insulator charging is not as well understood. Theoretical and experimental research has been performed that shows that the surface charge on an insulator after triboelectric charging with another insulator is

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

    NASA Astrophysics Data System (ADS)

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

    2011-12-01

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

  7. Use of a Multichannel Analyzer for Corona Pulse-Height Distribution Measurements on Cables and Other Electrical Apparatus

    Microsoft Academic Search

    R. Bartnikas

    1973-01-01

    A method in which use is made of a multichannel analyzer to measure the distribution of the corona pulse heights of insulating systems of various electrical apparatus such as transformers, capacitors, and cables is described. Suitable pulse-shaping circuitry is used in conjunction with an RCL-type corona pulse detector to provide a basic sensitivity level of 1 pC and corona pulse

  8. Fiber optic submarine cables cuts cost modeling and cable protection aspects

    NASA Astrophysics Data System (ADS)

    Al-Lawati, Ali

    2015-03-01

    This work presents a model to calculate costs associated with submarine fiber optic cable cuts. It accounts for both fixed and variable factors determining cost of fixing cables and restoring data transmission. It considers duration of a cut, capacity of fibers, number of fiber pairs and expected number of cuts during cable life time. Moreover, it provides templates for initial feasibility assessments by comparing cut costs to cost of different cable protection schemes. It offers a needed tool to assist in guiding decision makers in selecting type of cable, length and depth of cable burial in terms of increase in initial investment due to adapting such protection methods, and compare it to cost of cuts repair and alternative restoration paths for data.

  9. 7 CFR 1755.903 - Fiber optic service entrance cables.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...Name of Cable Manufacturer, Length of Cable, Reel Number, REA 7 CFR 1755.903. Example: Optical Cable, G.657 class A, 4 fibers, Armored. XYZ Company, 1050 meters, Reel Number 3, REA 7 CFR 1755.903. (11) When pre-connectorized cable...

  10. Control of the Thermal Environment of Buried Cable Systems

    Microsoft Academic Search

    L. H. Fink

    1954-01-01

    When an underground cable line is installed in an area where the soil is a poor conductor of heat, it is necessary to take corrective measures so that the heat generated in the cable may be dissipated without overheating the cable. The most practical approach is to replace the soil in the immediate vicinity of the cable with a substitute

  11. Shape adjustment based on optimization for cable mesh deployable antenna

    Microsoft Academic Search

    Jiejian Di; Yuxia Zhao; Qiguo Sun; Baoyan Duan

    2010-01-01

    To achieve the enough reflector precision of space antenna for accomplishment their missions with less adjustable cables, the optimization method is proposed in this paper. The mathematic model is built with the minimum adjustable cables and the highest surface accuracy as objectives, the adjustable cables and the increment cable length as design variables, the stresses and fundamental frequency as constraints.

  12. The development of 4 m HTS power cable

    Microsoft Academic Search

    Bo Hou; Haixia Xi; Feng Yuan; Yong Zhang; Ying Xin; Yanfang Bi; Songtao Wu; Huaikuang Ding; Jing Shi

    2004-01-01

    Superconducting cables offer the advantages of lower loss, lighter weight and smaller dimensions, as compared to conventional cables. A 4 m, 2 kA, AC, HTS cable system was developed for the purpose of study. The cable conductor was made of Bi-2223 tapes. A space maintained as a vacuum between two corrugated stainless steel tubes functions as a cryostat surrounding the

  13. Chaos theory analysis of cable-stayed bridge vibration

    Microsoft Academic Search

    Richard A. Livingston; Shuang Jin

    2006-01-01

    Cable-stayed bridges are a recent development in bridge structural design in which the cables meet the bridge deck at an acute angle rather than perpendicularly. Some early cable-stayed bridges have exhibited large amplitude stay cable oscillations. One such bridge, the Fred Hartman Bridge across the Houston Ship Channel in Texas displayed two different modes of vibration: a local mode involving

  14. Passive control of bridges: The double cable net method

    Microsoft Academic Search

    A. Michalopoulos; Th. Nikolaidis; G. E. Stavroulakis; C. C. Baniotopoulos

    2005-01-01

    We propose a new type of cable-supported bridge. The main elements of the bridge are two cable systems, (?) and (?), and a concrete bridge deck. The combination of a deck structure and a net of external prestressed cables is a very advantageous structural system because the use of external prestressing cables, called (a), neutralizes the permanent load and some

  15. Dimensioning the Contention Channel of DOCSIS Cable Modem Networks

    E-print Network

    . The Data Over Cable Service Interface Specifica- tions (DOCSIS) [3] are the dominant specifications for carrying data over Cable TV Distribution (CATV) networks and have been developed by CableLabs and MCNS-directional data transmissions over cable systems. It has been accepted by most major vendors and is now a widely

  16. 47 CFR 36.341 - Cable and wire facilities expenses-Account 6410 (Class B telephone companies); Accounts 6411...

    Code of Federal Regulations, 2010 CFR

    2010-10-01

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

  17. 47 CFR 36.341 - Cable and wire facilities expenses-Account 6410 (Class B telephone companies); Accounts 6411...

    Code of Federal Regulations, 2011 CFR

    2011-10-01

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

  18. 47 CFR 36.341 - Cable and wire facilities expenses-Account 6410 (Class B telephone companies); Accounts 6411...

    Code of Federal Regulations, 2014 CFR

    2014-10-01

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

  19. 47 CFR 36.341 - Cable and wire facilities expenses-Account 6410 (Class B telephone companies); Accounts 6411...

    Code of Federal Regulations, 2012 CFR

    2012-10-01

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

  20. Thermal insulating conformal blanket

    NASA Technical Reports Server (NTRS)

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

    2003-01-01

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

  1. Metal-insulator transitions

    Microsoft Academic Search

    Masatoshi Imada; Atsushi Fujimori; Yoshinori Tokura

    1998-01-01

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

  2. Multilayer Insulation Material Guidelines

    NASA Technical Reports Server (NTRS)

    Finckenor, M. M.; Dooling, D.

    1999-01-01

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

  3. Simple holographic insulator

    NASA Astrophysics Data System (ADS)

    Mefford, Eric; Horowitz, Gary T.

    2014-10-01

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

  4. A Simple Holographic Insulator

    E-print Network

    Eric Mefford; Gary T. Horowitz

    2014-07-11

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

  5. Underground distribution cable incipient fault diagnosis system

    E-print Network

    Jaafari Mousavi, Mir Rasoul

    2007-04-25

    This dissertation presents a methodology for an efficient, non-destructive, and online incipient fault diagnosis system (IFDS) to detect underground cable incipient faults before they become catastrophic. The system provides vital information...

  6. The manufacture of flat conductor cable

    NASA Technical Reports Server (NTRS)

    Angele, W.

    1974-01-01

    The major techniques are described for fabricating flat conductor cable (FCC). Various types of FCC, including unshielded, shielded, power, and signal, in both existing and conceptual constructions, are covered.

  7. 30 CFR 18.45 - Cable reels.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...LABOR TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS ELECTRIC MOTOR-DRIVEN MINE EQUIPMENT AND ACCESSORIES Construction...transmitting electrical energy. (d) Cable reels for shuttle cars and locomotives shall maintain positive tension on the...

  8. 30 CFR 18.45 - Cable reels.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...LABOR TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS ELECTRIC MOTOR-DRIVEN MINE EQUIPMENT AND ACCESSORIES Construction...transmitting electrical energy. (d) Cable reels for shuttle cars and locomotives shall maintain positive tension on the...

  9. 30 CFR 18.45 - Cable reels.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...LABOR TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS ELECTRIC MOTOR-DRIVEN MINE EQUIPMENT AND ACCESSORIES Construction...transmitting electrical energy. (d) Cable reels for shuttle cars and locomotives shall maintain positive tension on the...

  10. 30 CFR 18.45 - Cable reels.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...LABOR TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS ELECTRIC MOTOR-DRIVEN MINE EQUIPMENT AND ACCESSORIES Construction...transmitting electrical energy. (d) Cable reels for shuttle cars and locomotives shall maintain positive tension on the...

  11. 47 CFR 32.2421 - Aerial cable.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...well as the cost of other material used in construction of...include the original cost of optical fiber cable and other associated material used in constructing a physical...wire and other associated material used in constructing a...

  12. 47 CFR 32.2423 - Buried cable.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...as well as the cost of other material used in the construction...include the original cost of optical fiber cable and other associated material used in constructing a physical...wire and other associated material used in constructing a...

  13. 47 CFR 32.2422 - Underground cable.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...installed in conduit and of other material used in the construction...include the original cost of optical fiber cable and other associated material used in constructing a physical...wire and other associated material used in constructing a...

  14. Alternator insulation evaluation tests

    NASA Technical Reports Server (NTRS)

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

    1972-01-01

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

  15. Loose-fill insulations

    SciTech Connect

    NONE

    1995-05-01

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

  16. Composite Flexible Blanket Insulation

    NASA Technical Reports Server (NTRS)

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

    1991-01-01

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

  17. Topological crystalline insulator nanostructures

    NASA Astrophysics Data System (ADS)

    Shen, Jie; Cha, Judy J.

    2014-11-01

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

  18. Fiber Optic Cables in a Harsh Ocean Environment

    NASA Astrophysics Data System (ADS)

    Glavas, Xenophon G.

    1987-02-01

    Fiber optic cables have found widespread use in the ocean, but to fulfill its mission the cable must survive deployment and operation scenarios. Preservation of the manufactured strength and the optical transmission capacity of the optical fiber over its application lifetime are the primary system objectives. Other secondary objectives defined by system requirements include: fiber count, flexibility, weight, strength, lifetime, manufacturability, diameter, specific gravity, torsion stiffness, temperature influence, pressure effects, abrasion, cyclic flexure resistance, to name a few. This paper will discuss fiber optic cables, causes of failures, and their materials for use in the ocean for three general classes: a. Low cost, disposable cables. This requires the replacement rather than the repair of subject cables. Several applications fall into this category namely torpedo guidance, rapidly dispensible acoustic systems, and sonobuoy links. Life expectancy is months. b. Moderate cost, replaceable cables. This class of cables also requires the replacement of the cable; however, the system lifetime requires the cable be manufactured with the best materials for ocean service so once it is deployed, survival is ensured for many months or even years. Once the cable has failed, there will be no attempt to repair or recover the product, only replace it. Again, this type of cable would see an environment that spans the ocean depths. c. High cost, repairable cables. This class of cables constitutes the family of cables that generally require many years of service, extremely high cable bandwidth (high fiber count), span the major ocean depths and service continents or nations for their communications needs. The starting point for any cable design is defining the requirements the cable must meet. A systems approach is used to derive and impose on the design those requirements that influence cable function, life, cost and transmission capacity. A system analyses defines the hazards a cable will see over its lifespan. Each cable must be designed with the needs of the customer in mind so that it can be produced at a reasonable cost.

  19. 65. CALIFORNIA STREET CABLE RAILWAY WINDING MACHINERY: Photocopy of ...

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

    65. CALIFORNIA STREET CABLE RAILWAY - WINDING MACHINERY: Photocopy of February 1955 photograph showing the winding machinery of the California Street Cable Railroad. The two suspended sheaves on the right of the photograph bore down on the cable as it left the winders, supplying tension to the cable and eliminating the need for a long tension run. - San Francisco Cable Railway, Washington & Mason Streets, San Francisco, San Francisco County, CA

  20. On knot Floer homology and cabling

    Microsoft Academic Search

    Matthew Hedden

    2005-01-01

    We continue our study of the knot Floer homology invariants of cable knots.\\u000aFor large |n|, we prove that many of the filtered subcomplexes in the knot\\u000aFloer homology filtration associated to the (p,pn+1) cable of a knot, K, are\\u000aisomorphic to those of K. This result allows us to obtain information about the\\u000abehavior of the Ozsvath-Szabo concordance invariant

  1. System for effecting underwater coupling of optical fiber cables characterized by a novel V-probe cable capture mechanism

    NASA Astrophysics Data System (ADS)

    Hillenbrand, Christopher F.; Barron, Thomas D.; Nugent, David M.

    1995-03-01

    A submarine trails one fiber optic cable and an undersea vehicle is controlled by this first cable. A missile/torpedo trails a second cable that is to be coupled to the first cable. The second cable has a segment suspended vertically underwater between a buoyant pod and a sea anchor type buoy. The undersea vehicle, or Autonomous Undersea Vehicle, (AUV) hunts for the pod by conventional homing means. A forked cable pickup device in the nose of the AUV captures the suspended cable segment directing it into a slot so a male socket in the underside of the pod mates with a female socket in the slot.

  2. Noise performance of magneto-inductive cables

    SciTech Connect

    Wiltshire, M. C. K., E-mail: michael.wiltshire@imperial.ac.uk; Syms, R. R. A. [Optical and Semiconductor Devices Group, Department of Electrical and Electronic Engineering, Imperial College London, Exhibition Road, London SW7 2AZ (United Kingdom)

    2014-07-21

    Magneto-inductive (MI) waveguides are metamaterial structures based on periodic arrangements of inductively coupled resonant magnetic elements. They are of interest for power transfer, communications and sensing, and can be realised in a flexible cable format. Signal-to-noise ratio is extremely important in applications involving signals. Here, we present the first experimental measurements of the noise performance of metamaterial cables. We focus on an application involving radiofrequency signal transmission in internal magnetic resonance imaging (MRI), where the subdivision of the metamaterial cable provides intrinsic patient safety. We consider MI cables suitable for use at 300 MHz during {sup 1}H MRI at 7 T, and find noise figures of 2.3–2.8?dB/m, together with losses of 3.0–3.9?dB/m, in good agreement with model calculations. These values are high compared to conventional cables, but become acceptable when (as here) the environment precludes the use of continuous conductors. To understand this behaviour, we present arguments for the fundamental performance limitations of these cables.

  3. Noise performance of magneto-inductive cables

    NASA Astrophysics Data System (ADS)

    Wiltshire, M. C. K.; Syms, R. R. A.

    2014-07-01

    Magneto-inductive (MI) waveguides are metamaterial structures based on periodic arrangements of inductively coupled resonant magnetic elements. They are of interest for power transfer, communications and sensing, and can be realised in a flexible cable format. Signal-to-noise ratio is extremely important in applications involving signals. Here, we present the first experimental measurements of the noise performance of metamaterial cables. We focus on an application involving radiofrequency signal transmission in internal magnetic resonance imaging (MRI), where the subdivision of the metamaterial cable provides intrinsic patient safety. We consider MI cables suitable for use at 300 MHz during 1H MRI at 7 T, and find noise figures of 2.3-2.8 dB/m, together with losses of 3.0-3.9 dB/m, in good agreement with model calculations. These values are high compared to conventional cables, but become acceptable when (as here) the environment precludes the use of continuous conductors. To understand this behaviour, we present arguments for the fundamental performance limitations of these cables.

  4. Coaxial Cables for Martian Extreme Temperature Environments

    NASA Technical Reports Server (NTRS)

    Ramesham, Rajeshuni; Harvey, Wayne L.; Valas, Sam; Tsai, Michael C.

    2011-01-01

    Work was conducted to validate the use of the rover external flexible coaxial cabling for space under the extreme environments to be encountered during the Mars Science Laboratory (MSL) mission. The antennas must survive all ground operations plus the nominal 670-Martian-day mission that includes summer and winter seasons of the Mars environment. Successful development of processes established coaxial cable hardware fatigue limits, which were well beyond the expected in-flight exposures. In keeping with traditional qualification philosophy, this was accomplished by subjecting flight-representative coaxial cables to temperature cycling of the same depth as expected in-flight, but for three times the expected number of in-flight thermal cycles. Insertion loss and return loss tests were performed on the coaxial cables during the thermal chamber breaks. A vector network analyzer was calibrated and operated over the operational frequency range 7.145 to 8.450 GHz. Even though some of the exposed cables function only at UHF frequencies (approximately 400 MHz), the testing was more sensitive, and extending the test range down to 400 MHz would have cost frequency resolution. The Gore flexible coaxial cables, which were the subject of these tests, proved to be robust and displayed no sign of degradation due to the 3X exposure to the punishing Mars surface operations cycles.

  5. Gas insulated transmission line with insulators having field controlling recesses

    DOEpatents

    Cookson, Alan H. (Pittsburgh, PA); Pederson, Bjorn O. (Chelmsford, MA)

    1984-01-01

    A gas insulated transmission line having a novel insulator for supporting an inner conductor concentrically within an outer sheath. The insulator has a recess contiguous with the periphery of one of the outer and inner conductors. The recess is disposed to a depth equal to an optimum gap for the dielectric insulating fluid used for the high voltage insulation or alternately disposed to a large depth so as to reduce the field at the critical conductor/insulator interface.

  6. Solid state safety jumper cables

    DOEpatents

    Kronberg, James W. (353 Church Rd., Beech Island, SC 29841)

    1993-01-01

    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 determination of the decoder. No connection will be made unless only one terminal of each battery has a higher voltage than the reference voltage, indicating "positive" terminals, and one has a lower voltage than the reference voltage, indicating "negative" terminals, and that, therefore, the two high voltage terminals may be connected and the two lower voltage terminals may be connected. Current flows once the appropriate relay device is closed. The relay device is preferably a MOSFET (metal oxide semiconductor field effect transistor) combined with a series array of photodiodes that develop MOSFET gate-closing potential when the decoder output causes an LED to light.

  7. Solid state safety jumper cables

    DOEpatents

    Kronberg, J.W.

    1993-02-23

    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 determination of the decoder. No connection will be made unless only one terminal of each battery has a higher voltage than the reference voltage, indicating positive'' terminals, and one has a lower voltage than the reference voltage, indicating negative'' terminals, and that, therefore, the two high voltage terminals may be connected and the two lower voltage terminals may be connected. Current flows once the appropriate relay device is closed. The relay device is preferably a MOSFET (metal oxide semiconductor field effect transistor) combined with a series array of photodiodes that develop MOSFET gate-closing potential when the decoder output causes an LED to light.

  8. Fault Detection and Identification Methods Used for the LHC Cryomagnets and Related Cabling

    E-print Network

    Bozzini, D; Chareyre, V; Duse, Y; Kroyer, T; López, R; Poncet, A; Russenschuck, Stephan

    2006-01-01

    Several methods for electrical fault location have been developed and tested. As part of the electrical quality assurance program for the LHC, certain wires have to be subjected to a (high) DC voltage for the testing of the insulation. With the time difference of spark-induced electromagnetic signals measured with an oscilloscope, fault localization within ± 10 cm has been achieved. Another method used, and adapted for particular needs, is the synthetic pulse time-domain reflectometry (TDR) with a vector network analyzer (VNA). This instrument has also been applied as a low frequency sweep impedance analyzer in order to measure fractional capacitances of cable assemblies where TDR was not applicable.

  9. CALIFORNIA ENERGY Ceiling Insulation Report

    E-print Network

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

  10. Parallel wire cable static load testing

    NASA Astrophysics Data System (ADS)

    Velasco Gil, Isabella C.

    This report is the result of two evaluations for the analysis of parallel wire cables. The purpose of the first assessment was to evaluate the stiffness and strength of parallel wire cables. For the methodology, three test setups were executed utilizing single wires, seven wire parallel cables, and 100 wire parallel cables as specimens. The parallel wire cables were connected with molted zinc to their sockets. The cables were manufactured by Wilolamb Construction. The results indicate that the single, seven, and 100 wire specimens had similar performance in yield stress, yield strain, modulus, and ultimate strain. However, the amount of strain decreased as the number of wires increased. Because the mechanical properties of the multi wires specimens had not significant difference, it is suggested that the zinc sockets had insignificant impact on their performance. Comparing these results to a previous test executed for parallel wire cables, there were significant differences on the ultimate capacity. It is assumed that the fabrication method of the cables were different. The second evaluation had two purposes. First, it was intended to compare the results of the single wire test from OSU to the single wire test results from Sherry Laboratories. From the analysis, it was found that the ultimate and yield loads were similar between both laboratories procedures, but their strength capacity and ultimate strain were different. It was observed that the Sherry Lab used a different method to compute the mechanical properties of the wire and that the measurement of the elongation was different to the procedures from OSU. Second, the secondary analysis was to evaluate if there is any significant difference between wires sanded at the mid-length of the specimen and wires that were not sanded. From this analysis it was observed that there was no difference between the sanded and non-sanded wires, which indicated that cross-section reduction should not be necessary for the evaluation of multi wire cables. The results from this work were expected and agree with basic engineering principles, and that parallel wire cables are capable of performing as a group of wires with no significant losses.

  11. Thermal insulating material

    Microsoft Academic Search

    Billings

    1981-01-01

    A thermal insulating material which includes silicone coated perlite providing thermal insulation, powdered perlite to fill in the gaps between the silicone coated perlite particle, and a specially formulated binder for the perlite is disclosed. The binder has a powder portion comprising a mixture of gypsum and cement for strength and a liquid portion comprising polyvinyl acetate, a colloid and

  12. Mott Metal Insulator Transitions

    E-print Network

    Budker, Dmitry

    Laureate) Pointed out fatal flaw in central approximation in band theory: Inter- electron forces. 12 (December 12, 2012) 15 #12;Mott Insulators: Recap How things conduct Band Gap Fermi Level Why some things don't conduct Large Band Gap Mott Insulators Why not conducting can be awesome

  13. Thermal insulation blanket material

    NASA Technical Reports Server (NTRS)

    Pusch, R. H.

    1982-01-01

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

  14. 76 FR 77533 - Mandatory Electronic Filing for Cable Special Relief Petitions and Cable Show Cause Petitions...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-12-13

    ...electronic filing of Cable Special Relief (CSR) Petitions and Cable Show Cause (CSC...2011, voluntary electronic filing of CSR and CSC petitions will be permitted through...SUPPLEMENTARY INFORMATION: This is a summary of the CSR and CSC Electronic Filing Public...

  15. Breakdown of organic insulators

    NASA Technical Reports Server (NTRS)

    Cuddihy, E. F.

    1983-01-01

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

  16. New Opportunities for Cabled Ocean Observatories

    NASA Astrophysics Data System (ADS)

    Duennebier, F. K.; Butler, R.; Karl, D. M.; Roger, L. B.

    2002-12-01

    With the decommissioning of transoceanic telecommunications cables as they become obsolete or uneconomical, there is an opportunity to use these systems for ocean observatories. Two coaxial cables, TPC-1 and HAW-2 are currently in use for observatories, and another, ANZCAN, is scheduled to be used beginning in 2004 to provide a cabled observatory at Station ALOHA, north of Oahu. The ALOHA observatory will provide several Mb/s data rates and about 1 kW of power to experiments installed at Station ALOHA. Sensors can be installed either by wet mateable connection to a junction box on the ocean floor using an ROV, or by acoustic data link to the system. In either case real-time data will be provided to users over the Internet. A Small Experiment Module, to be first installed at the Hawaii-2 Observatory, and later at Station ALOHA, will provide relatively cheap and uncomplicated access to the observatories for relatively simple sensors. Within the next few years, the first electro-optical cables installed in the 1980's will be decommissioned and could be available for scientific use. These cables could provide long "extension cords" (thousands of km) with very high bandwidth and reasonable power to several observatories in remote locations in the ocean. While they could be used in-place, a more exciting scenario is to use cable ships to pick up sections of cable and move them to locations of higher scientific interest. While such moves would not be cheap, the costs would rival the cost of installation and maintenance of a buoyed observatory, with far more bandwidth and power available for science use.

  17. Load determination for long cable bolt support using computer aided bolt load estimation (CABLE) program

    SciTech Connect

    Bawden, W.F.; Moosavi, M.; Hyett, A.J. [Queen`s Univ., Kingston, Ontario (Canada)

    1996-12-01

    In this paper a numerical formulation is presented for determination of the axial load along a cable bolt for a prescribed distribution of rock mass displacement. Results using the program CABLE indicate that during excavation, the load distribution that develops along an untensioned fully grouted cable bolt depends on three main factors: (i) the properties of the cable itself, (ii) the shear force that develops due to bond at the cable-grout interface (i.e. bond stiffness), and (iii) the distribution of rock mass displacement along the cable bolt length. in general, the effect of low modulus rock and mining induced stress decreases in reducing bond strength as determined from short embedment length tests, is reflected in the development of axial loads significantly less than the ultimate tensile capacity even for long cable bolts. However, the load distribution is also dependent on the deformation distribution in the reinforced rock mass. Higher cable bolt loads will be developed for a rock mass that behaves as a discontinuum, with deformation concentrated on a few fractures, than for one which behaves as a continuum, either due to a total lack of fractures or a very high fracture density. This result suggests that the stiffness of a fully grouted cable bolt is not simply a characteristic of the bolt and grout used, but also of the deformation behavior of the ground. In other words, the same combination of bolt and grout will be stiffer if the rock behaves as a discontinuum than if it behaves as a continuum. This paper also explains the laboratory test program used to determine the constitutive behavior of the Garford bulb and Nutcase cables bolts. Details of the test setup as well as the obtained results are summarized and discussed.

  18. Detonator cable initiation system safety investigation: Consequences of energizing the detonator and actuator cables

    SciTech Connect

    Osher, J.; Chau, H.; Von Holle, W.

    1994-03-01

    This study was performed to explore and assess the worst-case response of a W89-type weapons system, damaged so as to expose detonator and/or detonator safing strong link (DSSL) cables to the most extreme, credible lightning-discharge, environment. The test program used extremely high-current-level, fast-rise-time (1- to 2-{mu}s) discharges to simulate lightning strikes to either the exposed detonator or DSSL cables. Discharges with peak currents above 700 kA were required to explode test sections of detonator cable and launch a flyer fast enough potentially to detonate weapon high explosive (HE). Detonator-safing-strong-link (DSSL) cables were exploded in direct contact with hot LX-17 and Ultrafine TATB (UFTATB). At maximum charging voltage, the discharge system associated with the HE firing chamber exploded the cables at more than 600-kA peak current; however, neither LX-17 nor UFTATB detonated at 250{degree}C. Tests showed that intense surface arc discharges of more than 700 kA/cm in width across the surface of hot UFTATB [generally the more sensitive of the two insensitive high explosives (IHE)] could not initiate this hot IHE. As an extension to this study, we applied the same technique to test sections of the much-narrower but thicker-cover-layer W87 detonator cable. These tests were performed at the same initial stored electrical energy as that used for the W89 study. Because of the narrower cable conductor in the W87 cables, discharges greater than 550-kA peak current were sufficient to explode the cable and launch a fast flyer. In summary, we found that lightning strikes to exposed DSSL cables cannot directly detonate LX-17 or UFTATB even at high temperatures, and they pose no HE safety threat.

  19. XLPE based Al2O3-clay binary and ternary hybrid nanocomposites: self-assembly of nanoscale hybrid fillers, polymer chain confinement and transport characteristics.

    PubMed

    Jose, Josmin P; Thomas, Sabu

    2014-10-01

    Transport properties of hybrid nanoparticle based cross-linked polyethylene (XLPE)-Al2O3-clay binary and ternary nanocomposites have been investigated with special significance to the hybrid effect and synergism of hybrid nanofillers. Compiling the temperature and filler effects demonstrates the self-assembly of hybrid nanofillers in confining the polymer chain dynamics. Studies on transport mechanisms, transport coefficients, and swelling parameters confirm the superior solvent resistant properties of hybrid filler reinforced nanocomposites. Experiments confirmed the extra stability of the ternary hybrid nanocomposites against the process of solvent penetration. Thermodynamic and kinetic investigations reveal that the nanofillers are competent to alter the thermodynamic feasibility and rate constant parameters. Theoretical predictions by the Peppas-Sahlin model suggest that the diffusion process is well thought-out to be a combination of diffusion into the swollen polymer and the polymer chain relaxation process. The morphology and the network density estimation confirm the presence of filler networks and the trapped polymer chains inside them, in ternary systems, which elucidate the microstructure assisted solvent resistant properties of the ternary hybrid nanocomposites. The amount of polymer chains immobilized by the filler surface was computed from dynamic mechanical analysis and a nice correlation was established between transport characteristics and the polymer chain confinement. PMID:25139530

  20. Coaxial cable distribution plant performance simulation

    NASA Astrophysics Data System (ADS)

    Carangi, Mark D.; Chen, Walter Y.; Kerpez, Kenneth J.; Valenti, Craig F.

    1995-11-01

    The CATV system delivers analog video signals from a centralized headend through a tree- and-branch fiber/coax network. That architecture is very cost effective for delivering broadcast video channels to a vast area. The introduction of interactive TV, data and telephony services requires an upstream link from customers to the headend. Although equipment for upstream transmission is available, CATV systems are primarily engineered for the delivery of one way analog broadcast TV programs. In this paper, issues related to two-way digital transmission through the coaxial cable distribution plant are examined. The objective is to establish a reliable computer modeling environment for the study and simulation of general and advanced transmission systems over the coaxial cable distribution plant. The discussions are focused on three general topics: the coaxial cable distribution plant transmission channel, the corresponding noise environment, and applicable transmission system architectures. Two- port network models are developed for the components (coaxial cable, taps, etc.) of the coaxial cable distribution plant. A realistic distribution plant channel model can be constructed based on these component models. The distribution plant noise level is analyzed based on thermal noise level, amplifier noise figure, and the funneling effect. The upstream ingress noise model is also developed. Three advanced transmission systems, adaptive transmitter, frame based equalization, and discrete multitone (DMT), are presented. End to end computer simulation results are presented using QPSK upstream.

  1. Microsphere Insulation Panels

    NASA Technical Reports Server (NTRS)

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

    2006-01-01

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

  2. Cryogenic insulation development

    NASA Technical Reports Server (NTRS)

    Leonhard, K. E.

    1972-01-01

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

  3. Building insulation technology: Kuwait

    SciTech Connect

    Ezz Al Din, M.A.

    1986-01-01

    Recommendations are reached through the use of a value analysis approach to adapt building insulation technology to Kuwait environment. The economical and technical aspects of using insulation influencing architectural and engineering decisions are presented. Research has confirmed that savings of 25% to 40% of electrical energy required in cooling and heating the building can be achieved by the proper use of insulating materials. Though the ideas of this study are tailored for Kuwait, yet it may be appropriate and applicable to many countries with hot climate.

  4. Milli's Insulation Investigation

    NSDL National Science Digital Library

    American Chemical Society

    2006-01-01

    In this activity on page 2 of the PDF, learners test different materials to find out which is the best insulator. Learners use aluminum foil, newspaper, plastic wrap, and wax paper to insulate ice cubes and compare the melting rate of each ice cube. Use this activity to introduce learners to heat transfer (conduction) and insulation materials. Safety notes: Adult supervision required. Do not eat or drink any of the materials in this activity. Follow Milli's safety tips, which are listed on the left hand side of page 2.

  5. Commercialization of Medium Voltage HTS Triax TM Cable Systems

    SciTech Connect

    Knoll, David

    2012-12-31

    The original project scope that was established in 2007 aimed to install a 1,700 meter (1.1 mile) medium voltage HTS Triax{TM} cable system into the utility grid in New Orleans, LA. In 2010, however, the utility partner withdrew from the project, so the 1,700 meter cable installation was cancelled and the scope of work was reduced. The work then concentrated on the specific barriers to commercialization of HTS cable technology. The modified scope included long-length HTS cable design and testing, high voltage factory test development, optimized cooling system development, and HTS cable life-cycle analysis. In 2012, Southwire again analyzed the market for HTS cables and deemed the near term market acceptance to be low. The scope of work was further reduced to the completion of tasks already started and to testing of the existing HTS cable system in Columbus, OH. The work completed under the project included: • Long-length cable modeling and analysis • HTS wire evaluation and testing • Cable testing for AC losses • Optimized cooling system design • Life cycle testing of the HTS cable in Columbus, OH • Project management. The 200 meter long HTS Triax{TM} cable in Columbus, OH was incorporated into the project under the initial scope changes as a test bed for life cycle testing as well as the site for an optimized HTS cable cooling system. The Columbus cable utilizes the HTS TriaxTM design, so it provided an economical tool for these of the project tasks.

  6. Distance and Cable Length Measurement System

    PubMed Central

    Hernández, Sergio Elias; Acosta, Leopoldo; Toledo, Jonay

    2009-01-01

    A simple, economic and successful design for distance and cable length detection is presented. The measurement system is based on the continuous repetition of a pulse that endlessly travels along the distance to be detected. There is a pulse repeater at both ends of the distance or cable to be measured. The endless repetition of the pulse generates a frequency that varies almost inversely with the distance to be measured. The resolution and distance or cable length range could be adjusted by varying the repetition time delay introduced at both ends and the measurement time. With this design a distance can be measured with centimeter resolution using electronic system with microsecond resolution, simplifying classical time of flight designs which require electronics with picosecond resolution. This design was also applied to position measurement. PMID:22303169

  7. Computer-Aided Engineering Of Cabling

    NASA Technical Reports Server (NTRS)

    Billitti, Joseph W.

    1989-01-01

    Program generates data sheets, drawings, and other information on electrical connections. DFACS program, centered around single data base, has built-in menus providing easy input of, and access to, data for all personnel involved in system, subsystem, and cabling. Enables parallel design of circuit-data sheets and drawings of harnesses. Also recombines raw information to generate automatically various project documents and drawings, including index of circuit-data sheets, list of electrical-interface circuits, lists of assemblies and equipment, cabling trees, and drawings of cabling electrical interfaces and harnesses. Purpose of program to provide engineering community with centralized data base for putting in, and gaining access to, functional definition of system as specified in terms of details of pin connections of end circuits of subsystems and instruments and data on harnessing. Primary objective to provide instantaneous single point of interchange of information, thus avoiding

  8. Outdoor HV composite polymeric insulators

    Microsoft Academic Search

    R. Hackam

    1999-01-01

    HV composite polymeric insulators are being accepted increasingly for use in outdoor installations by the traditionally cautious electric power utilities worldwide. They currently represent ~60 to 70% of newly installed HV insulators in North America. The tremendous growth in the applications of non-ceramic composite insulators is due to their advantages over the traditional ceramic and glass insulators. These include light

  9. The charging of insulator surfaces

    Microsoft Academic Search

    Adrian G. Bailey

    2001-01-01

    The first recorded investigations of triboelectric charging of materials occurred over 2000 years ago. Since the 18th Century a greater understanding of charging processes and the manner by which insulators hold charge has developed. A brief review of some aspects of insulator\\/insulator and insulator\\/metal charging is presented.

  10. Fabrication and test of a racetrack magnet using pre-reacted Nb3Sn cable

    SciTech Connect

    Giorgio Ambrosio et al.

    2002-12-11

    A racetrack magnet, using Nb{sub 3}Sn superconducting cable reacted before winding, has been fabricated and tested at Fermilab. It consists of two flat racetrack coils, connected in a common-coil configuration, separated by a 5 mm thick fiberglass plate. Synthetic oil was used to prevent sintering of the strands during the heat treatment. The coils were wound and vacuum impregnated in the mechanical structure. The turn-to-turn insulation, consisting of Kapton{reg_sign}and pre-impregnated fiberglass tapes as wide as the cable, was wound together with the bare cable in order to form a continuous inter-turn spacer. The coils were instrumented with voltage taps, temperature sensors, spot heaters and quench heaters. The maximum current achieved was 12675 A which is 78% of the short sample limit at 5.1 K (minimum temperature in the coil during 75 A/s ramp). Measurement of the temperature margin revealed a low degradation in the innermost turns. Quench performances at different temperatures and ramp rate effects have been measured and are presented and discussed.

  11. Relative stiffness of flat conductor cables

    NASA Technical Reports Server (NTRS)

    Hankins, J. D.

    1976-01-01

    The measurement of the bending moment required to obtain a given deflection in short lengths of flat conductor cable (FCC) is presented in this report. Experimental data were taken on 10 different samples of FCC and normalized to express all bending moments (relative stiffness factor) in terms of a cable 5.1 cm (2.0 in.) in width. Data are presented in tabular and graphical form for the covenience of designers who may be interested in finding torques exerted on critical components by short lengths of FCC.

  12. Flat conductor cable for electrical packaging

    NASA Technical Reports Server (NTRS)

    Angele, W.

    1972-01-01

    Flat conductor cable (FCC) is relatively new, highly promising means for electrical packaging and system integration. FCC offers numerous desirable traits (weight, volume and cost savings, flexibility, high reliability, predictable and repeatable electrical characteristics) which make it extremely attractive as a packaging medium. FCC, today, finds wide application in everything from integration of lunar equipment to the packaging of electronics in nuclear submarines. Described are cable construction and means of termination, applicable specifications and standards, and total FCC systems. A list of additional sources of data is also included for more intensive study.

  13. Cooper Pairs in Insulators?!

    ScienceCinema

    James Valles

    2010-01-08

    Nearly 50 years elapsed between the discovery of superconductivity and the emergence of the microscopic theory describing this zero resistance state. The explanation required a novel phase of matter in which conduction electrons joined in weakly bound pairs and condensed with other pairs into a single quantum state. Surprisingly, this Cooper pair formation has also been invoked to account for recently uncovered high-resistance or insulating phases of matter. To address this possibility, we have used nanotechnology to create an insulating system that we can probe directly for Cooper pairs. I will present the evidence that Cooper pairs exist and dominate the electrical transport in these insulators and I will discuss how these findings provide new insight into superconductor to insulator quantum phase transitions. 

  14. Repairing ceramic insulating tiles

    NASA Technical Reports Server (NTRS)

    Dunn, B. R.; Laymance, E. L.

    1980-01-01

    Fused-silica tiles containing large voids or gauges are repaired without adhesives by plug insertion method. Tiles are useful in conduits for high-temperature gases, in furnaces, and in other applications involving heat insulation.

  15. Composite flexible blanket insulation

    NASA Technical Reports Server (NTRS)

    Kourtides, Demetrius A. (inventor); Lowe, David M. (inventor)

    1994-01-01

    An improved composite flexible blanket insulation is presented comprising top silicon carbide having an interlock design, wherein the reflective shield is composed of single or double aluminized polyimide and wherein the polyimide film has a honeycomb pattern.

  16. 30 CFR 75.816 - Guarding of cables.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...components. (b) Guarding must minimize the possibility of miners contacting the cables and protect the cables from damage. The guarding must be made of grounded metal or nonconductive flame-resistant...

  17. 30 CFR 75.816 - Guarding of cables.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...components. (b) Guarding must minimize the possibility of miners contacting the cables and protect the cables from damage. The guarding must be made of grounded metal or nonconductive flame-resistant...

  18. Characterization and detection of incipient underground cable failures

    E-print Network

    Chaturbedi, Ritesh

    2002-01-01

    -destructive, incipient fault detection system, which can also predict the remaining life of an underground cable, is prevalent. Such an incipient fault detection system could enable utilities to reconfigure the distribution system or replace the cable before a...

  19. Burning Characteristics and Flammability of PVC Cables in Groups

    NASA Technical Reports Server (NTRS)

    Mikado, T.; Akita, K.

    1988-01-01

    Because burning cables represent a danger of increasing secondary damage it is of utmost importance for disaster prevention to correctly evaluate the combustion characteristics of cable. However, in many cases cable is laid out in bundles complicating the combustion characteristics. A situation has developed where group cable characteristics are not completely understood. A new method is developed for testing the combustion of high polymer type cable and earlier reports gave comparative combustion measurement results. It was learned that there is considerable difference between the combustion characteristics of the grouped cables and those of single cables. This study is supplemental research concerning the special behavior of group PVC cables, throwing some light on their combustion characteristics.

  20. 47 CFR 76.802 - Disposition of cable home wiring.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...BROADCAST RADIO SERVICES MULTICHANNEL VIDEO AND CABLE TELEVISION SERVICE Cable Inside...the wiring. (h) If an alternative video programming service provider connects...prevent signal leakage, the alternative video programming service provider shall...

  1. 47 CFR 76.111 - Cable sports blackout.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 2013-10-01 false Cable sports blackout. 76.111 Section 76.111 Telecommunication...Non-duplication Protection, Syndicated Exclusivity and Sports Blackout § 76.111 Cable sports blackout. (a) No community unit...

  2. 47 CFR 76.111 - Cable sports blackout.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 2010-10-01 false Cable sports blackout. 76.111 Section 76.111 Telecommunication...Non-duplication Protection, Syndicated Exclusivity and Sports Blackout § 76.111 Cable sports blackout. (a) No community unit...

  3. 47 CFR 76.111 - Cable sports blackout.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 2012-10-01 false Cable sports blackout. 76.111 Section 76.111 Telecommunication...Non-duplication Protection, Syndicated Exclusivity and Sports Blackout § 76.111 Cable sports blackout. (a) No community unit...

  4. 47 CFR 76.111 - Cable sports blackout.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 2014-10-01 false Cable sports blackout. 76.111 Section 76.111 Telecommunication...Non-duplication Protection, Syndicated Exclusivity and Sports Blackout § 76.111 Cable sports blackout. (a) No community unit...

  5. 47 CFR 76.111 - Cable sports blackout.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 2011-10-01 false Cable sports blackout. 76.111 Section 76.111 Telecommunication...Non-duplication Protection, Syndicated Exclusivity and Sports Blackout § 76.111 Cable sports blackout. (a) No community unit...

  6. 47 CFR 76.956 - Cable operator response.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...franchising authority, a cable operator must file with the local franchise authority a response to the complaint. The response...The cable operator must file its response with the local franchise authority via first class mail. (b) The burden...

  7. 47 CFR 15.118 - Cable ready consumer electronics equipment.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 false Cable ready consumer electronics equipment. 15.118 Section 15.118...Radiators § 15.118 Cable ready consumer electronics equipment. (a) All consumer electronics TV receiving equipment marketed in...

  8. 47 CFR 15.118 - Cable ready consumer electronics equipment.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 false Cable ready consumer electronics equipment. 15.118 Section 15.118...Radiators § 15.118 Cable ready consumer electronics equipment. (a) All consumer electronics TV receiving equipment marketed in...

  9. 47 CFR 15.118 - Cable ready consumer electronics equipment.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 false Cable ready consumer electronics equipment. 15.118 Section 15.118...Radiators § 15.118 Cable ready consumer electronics equipment. (a) All consumer electronics TV receiving equipment marketed in...

  10. 47 CFR 76.802 - Disposition of cable home wiring.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...BROADCAST RADIO SERVICES MULTICHANNEL VIDEO AND CABLE TELEVISION SERVICE Cable Inside...the wiring. (h) If an alternative video programming service provider connects...prevent signal leakage, the alternative video programming service provider shall...

  11. 47 CFR 76.802 - Disposition of cable home wiring.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...BROADCAST RADIO SERVICES MULTICHANNEL VIDEO AND CABLE TELEVISION SERVICE Cable Inside...the wiring. (h) If an alternative video programming service provider connects...prevent signal leakage, the alternative video programming service provider shall...

  12. 47 CFR 76.802 - Disposition of cable home wiring.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...BROADCAST RADIO SERVICES MULTICHANNEL VIDEO AND CABLE TELEVISION SERVICE Cable Inside...the wiring. (h) If an alternative video programming service provider connects...prevent signal leakage, the alternative video programming service provider shall...

  13. 47 CFR 76.802 - Disposition of cable home wiring.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...BROADCAST RADIO SERVICES MULTICHANNEL VIDEO AND CABLE TELEVISION SERVICE Cable Inside...the wiring. (h) If an alternative video programming service provider connects...prevent signal leakage, the alternative video programming service provider shall...

  14. 2. OBLIQUE VIEW OF HOIST, SHOWING CABLE DRUM, WOODEN BRAKE ...

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

    2. OBLIQUE VIEW OF HOIST, SHOWING CABLE DRUM, WOODEN BRAKE SHOES, BRAKE HANDLE, AND REDUCTION GEARS, LOOKING SOUTHWEST - Buffalo Coal Mine, Vulcan Cable Hoist, Wishbone Hill, Southeast end, near Moose Creek, Sutton, Matanuska-Susitna Borough, AK

  15. 47 CFR 32.2426 - Intrabuilding network cable.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 false Intrabuilding network cable. 32.2426 Section 32.2426...Accounts § 32.2426 Intrabuilding network cable. (a) This account shall...side of the demarcation point or standard network interface inside subscribers'...

  16. 47 CFR 32.2426 - Intrabuilding network cable.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 false Intrabuilding network cable. 32.2426 Section 32.2426...Accounts § 32.2426 Intrabuilding network cable. (a) This account shall...side of the demarcation point or standard network interface inside subscribers'...

  17. 46 CFR 111.12-9 - Generator cables.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 2010-10-01 false Generator cables. 111.12-9 Section... ELECTRICAL ENGINEERING ELECTRIC SYSTEMS-GENERAL REQUIREMENTS Generator Construction and Circuits § 111.12-9 Generator cables. (a) The...

  18. 46 CFR 111.12-9 - Generator cables.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 2011-10-01 false Generator cables. 111.12-9 Section... ELECTRICAL ENGINEERING ELECTRIC SYSTEMS-GENERAL REQUIREMENTS Generator Construction and Circuits § 111.12-9 Generator cables. (a) The...

  19. 47 CFR 32.2424 - Submarine & deep sea cable.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...and deep sea cable and other material used in the construction...include the original cost of optical fiber cable and other associated material used in constructing a physical...wire and other associated material used in constructing a...

  20. 7 CFR 3201.43 - Chain and cable lubricants.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...PROCUREMENT Designated Items § 3201.43 Chain and cable lubricants. (a) Definition. Products designed to provide lubrication in such applications as bar and roller chains, sprockets, and wire ropes and cables. Products may also prevent rust...