Conference Record of the 1992 IEEE International Symposium on Electrical Insulation

7-10 June 1992

Filter Results

Displaying Results 1 - 25 of 117
  • Partial discharge in dielectric fluids

    Publication Year: 1992
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (69 KB)

    Summary form only given. The primary interest of this study was in the temporal and spatial development of partial discharges at voltages near their inception. Results were obtained during a short time interval after the application of a DC voltage to the test gap. Photographs showed the structure of the cavity and suggested the onset of fingerlike projections in the cavity wall. The structure of ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A pathway to multifactor aging

    Publication Year: 1992
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (100 KB)

    Summary form only given, as follows. The author reviews the history of thermal and electrical aging relations and analyzes their limitations. The focus is on the variety of electrical aging equations that have been used, and their empirical nature is confirmed. The author argues that the solution to the multifactor aging dilemma lies in the acquirement of an understanding of the basic mechanisms t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Conference Record of the 1992 IEEE International Symposium on Electrical Insulation (Cat. No.92CH3150-0)

    Publication Year: 1992
    Request permission for commercial reuse | PDF file iconPDF (19 KB)
    Freely Available from IEEE
  • Dielectric and thermoanalytical behaviors of poly(p-phenylene sulfide) polymers

    Publication Year: 1992, Page(s):157 - 160
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    Both highly linear and cross-linked poly(p-phenylene sulfide) (PPS) polymers were investigated dielectrically and thermoanalytically to estimate how much the structural differences affect their behavior from room temperature to 200°C or 300°C. It was found that the polymers showed similar thermodynamic behavior as well as nearly equal dielectric properties in a temperature range below ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Application of pulse width analysis to partial discharge detection

    Publication Year: 1992, Page(s):345 - 348
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    An online partial discharge test for large steam turbine generators has been developed whereby partial discharges and noise are distinguished on the basis of pulse width. The pulse signals are detected by stator slot couplers (SSCs) which are permanently installed within the generator. Experiments have shown that partial discharge pulses, as detected by an SSC, have a pulse duration of only a few ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • SF6 breakdown characteristics with a specially-designed cathode

    Publication Year: 1992, Page(s):320 - 323
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    A high-voltage photocathode design recently introduced for breakdown studies in compressed-gas and high-field conditions is used in a study of SF6. The experiment was carried out for N×d ranging from 0.25 to 3.3×1019 cm-2, N and d being, respectively, the molecular density and gap length. Statistical scattering of da... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Study of thermal oxidation in medium density polyethylene

    Publication Year: 1992, Page(s):161 - 164
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    Studies of thermal oxidation in a well-characterized medium-density polyethylene (MDPE) were performed using thermostimulated depolarization current (TSD) analysis, infrared (IR) spectroscopy and size exclusion chromatography (SEC). TSD spectra clearly indicate structural changes occurring during oxidation of the material. For the virgin samples, evidence for existence of only a weak α proce... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Variations in the stochastic behavior of partial-discharge pulses with point-to-dielectric gap spacing

    Publication Year: 1992, Page(s):349 - 353
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    The stochastic behavior of AC-generated partial-discharge (PD) pulses in a point-to-dielectric air gap has been thoroughly characterized from direct measurements of various conditional and unconditional phase-restricted pulse-height and phase-of-occurrence distributions. A stochastic analyzer was used to examine changes in the stochastic behavior of PD pulses that occur when the gap distance betwe... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Investigation of dielectric breakdown of polyvinylidene fluoride using AC and DC methods

    Publication Year: 1992, Page(s):181 - 184
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The dielectric breakdown strength of polyvinylidene fluoride (PVDF) has been investigated using both AC and DC methods. The DC breakdown strength of PVDF was in the range of 720 to 770 MV/m, which was as good as or better than that of capacitor grade polypropylene film. The AC breakdown strength of PVDF was 220 to 233 MV/m. The AC-to-DC ratio of breakdown strengths for PVDF was significantly lower... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Electrical performance of fiberglass crossarms aged in transmission line

    Publication Year: 1992, Page(s):217 - 221
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    The authors present the results of an investigation of the electrical performance of a 115-kV transmission line fiberglass crossarm. Crossarms removed from service and companion crossarms stored outdoors but not in service were examined. The evaluation of electrical performance was based on flashover voltage value at AC voltages and at standard lightning impulse voltages, measured under dry and we... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Water tree growth in very low density polyethylene

    Publication Year: 1992, Page(s):114 - 119
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    The electrical and mechanical properties of a very low density polyetheylene (VLDPE) cross-linked using a suitable peroxide have been studied. Water tree growth in this cross-linked polyethylene (XLPE) was investigated under accelerated conditions. These experiments demonstrated an increased resistance of this compound to water tree growth depending strongly on the molding procedures. The results ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Photoelastic measurements of mechanical stresses induced in XLPE during electrical aging

    Publication Year: 1992, Page(s):52 - 56
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    The mechanical response of cross-linked polyethylene (XLPE) to a cyclic stress induced by oscillating electrostatic forces could be an important factor with regard to long-term degradation. To demonstrate the presence of mechanical stresses induced by high electric fields in XLPE, the authors performed photoelastic measurements. These measurements were conducted on tip-plane-geometry XLPE samples ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Fast measurements of electron emission current and X-ray intensity during pulsed vacuum breakdown

    Publication Year: 1992, Page(s):324 - 327
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    Breakdown experiments were performed for a point-plane gap in a technical vacuum by applying overshooting 1/50-μs impulse voltage. The electron emission current and X-ray intensity during breakdown development were measured with a high-bandwidth measuring system. These measurements were synchronized with the ultrafast streak photography of breakdown development. The streak photographs showed os... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Water content of XLPE cable insulation

    Publication Year: 1992, Page(s):165 - 168
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    The authors deal with water absorption and diffusion in various kinds of cross-linked polyethylene (XLPE) cable insulation: steam-cured, dry-cured, and with and without water tree retardant (WTR). Measurements were performed on pieces of insulation directly or on cable specimens immersed in water at different temperatures. As expected, the steam-cured insulation absorbed much more water than the d... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Partial discharge patterns and surface deterioration in voids in filled and unfilled epoxy

    Publication Year: 1992, Page(s):354 - 358
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    Results are presented from analyses of pulses from partial discharges (PDs) in single spherical voids in filled and unfilled epoxy plastic and related to the observed surface deterioration. The filler types used were dolomite, alumina, and silica. Long-time aging tests including pulse phase/height analyses were performed over a period of 2400 h and showed very characteristic discharge patterns for... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Dielectric breakdown of polypropylene under high frequency fields

    Publication Year: 1992, Page(s):185 - 188
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    Polypropylene, a low-loss, high-dielectric-strength film was characterized for its dielectric properties under high-voltage, high-frequency conditions. The properties that were measured included the breakdown voltages and the high-voltage aging characteristics at frequencies up to 30 kHz. The exponential law is used in the evaluation of the experimental data, and the constants of this voltage agin... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Polymer insulating materials and insulators for high voltage outdoor applications

    Publication Year: 1992, Page(s):222 - 228
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    The authors discuss the characterization, evaluation and performance of polymer weathershed materials and insulators used for high-voltage outdoor applications. Ethylene propylene diene monomer (EPDM), ethylene propylene monomer (EPM), silicone rubber (SR), and an EPDM/silicone rubber alloy were tested. The tests considered most pertinent for these materials and applications are described. Test re... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Accelerated water tree tests on three layer miniature cables

    Publication Year: 1992, Page(s):120 - 124
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Miniature cables were extruded using a true triple or three-in-one extrusion technique, and their performance under accelerated water tree tests was compared to that of a full-size cable. Standard test conditions were used. The cable degradation process was monitored by measuring the AC breakdown strength as a function of the aging time. High-frequency cable life testing was also initiated and is ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Influence of space charges and content of oxygen on the luminescence light and dielectric aging effects

    Publication Year: 1992, Page(s):57 - 61
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    The influence of space charge in conjunction with oxygen on the characteristics of the electroluminescence (EL) emitted during the initiation of an electrical tree in low-density polyethylene (LDPE) was investigated. Measurements were done on both Lupolen 1812 DSK and BPD 4901 materials. Sensitive and extensive phase analysis of the EL light relative to the applied high voltage revealed a reproduc... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Rate of S2F10 production from negative corona in compressed SF6

    Publication Year: 1992, Page(s):328 - 331
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Using a mass-spectrometer-gas-chromatograph capable of detecting S 2F10 concentrations in SF6 down to the part in 109 level, the rates of S2F10 production from DC glow-type negative point-plane corona discharges in pressurized SF6 have been measured at different absolute gas pressures in the range of 100 to 500 kPa and at... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Partial discharge measurements and pulsed resonant wave excitation

    Publication Year: 1992, Page(s):389 - 392
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    A transient technique, referred to as the pulsed resonant wave technique, for in situ testing of extruded polymeric cable is discussed. A small, cost-effective power supply is used for energizing large capacitance specimens. This power supply has many of the benefits of testing at power line frequencies and none of the drawbacks of the other current methods, which are discussed for comparison. A d... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Effect of antioxidant concentration and radiation dose on oxidation induction time

    Publication Year: 1992, Page(s):169 - 172
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    Oxidation induction time (OIT) provides a useful measurement of aging of electrical cable insulation. The technique is being refined for application to 1E electric cable in nuclear power plants. Exponential correlations have been found for OIT as functions of both radiation dose and antioxidant concentration for ethylene-propylene rubber (EPR) and cross-linked polyetheylene (XLPE) cable materials.... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance characteristics of water blocking tapes and their influence on water treeing in XLPE insulation

    Publication Year: 1992, Page(s):99 - 103
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    The performance characteristics of several commercially available water swellable tapes have been evaluated in terms of their swelling behavior, water blocking capacity and influence on water treeing in power cable insulated with cross-linked polyethylene (XLPE). The nonconducting water blocking tapes have been found to exhibit superior swelling behavior and water penetration resistance than the s... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Leakage resistance of transmission line insulators along the coast

    Publication Year: 1992, Page(s):245 - 248
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    The leakage resistance of transmission line insulators suspended along the coast decreases with the accumulation of sea salt due to wind from the sea, particularly when the relative humidity is high. To determine the dependence of the insulation properties of a string of three standard suspension insulator units and a long rod insulator on weather conditions, a field test site was installed in Rum... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Fluid choices in retrofilling PCB transformers

    Publication Year: 1992, Page(s):445 - 447
    Cited by:  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    Since the production of PCB-containing fluids was discontinued, several dielectric fluid options have emerged. The author examines the most popular options and discusses their relative characteristics with respect to electrical properties, physical traits, use with switching operations, maintenance and environmental fate. The four predominant synthetic and natural materials that lend themselves to... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.