[1992] Proceedings of the 4th International Conference on Conduction and Breakdown in Solid Dielectrics

22-25 June 1992

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Displaying Results 1 - 25 of 111
  • Effect of additives on the electrical aging of impregnated polypropylene films

    Publication Year: 1992, Page(s):275 - 279
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (157 KB)

    In relation to the aging of power capacitors, the authors study the degradation of polypropylene (PP) films impregnated with an aromatic liquid at high AC electric fields. An investigation at 135 V/sub rms/ mu m/sup -1/, 80 degrees C, and with O/sub 2/-saturated benzyltoluene as impregnant has been conducted. By measuring the threshold voltage for discharge detection in a capacitor model the autho... View full abstract»

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  • Space charge measurements in high voltage cables

    Publication Year: 1992, Page(s):92 - 96
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (107 KB)

    It is demonstrated that the thermal step method makes it possible to study the electric state of high-voltage cable. The origin and nature of the space charge can be determined by systematic studies with varying important parameters. The authors present results for two different XLPE (cross-linked polyethylene) virgin cables: the insulating thicknesses are 15 mm and 11 mm.<> View full abstract»

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  • Space charge measurements: electrode effects and prebreakdown

    Publication Year: 1992, Page(s):111 - 115
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (130 KB)

    The authors discuss the measurement of space charge in insulating polymers using a nondestructive method called the thermal step method (TSM). The principles of the TSM are first described. Using this method, the authors study the influence of semiconducting electrodes which assure the electric contact between the insulating polymers and metal electrodes as used in high-voltage cables. Under certa... View full abstract»

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  • Monitoring of partial discharges in capacitor models with impregnated polypropylene films

    Publication Year: 1992, Page(s):205 - 208
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (143 KB)

    Experiments were made using an aromatic hydrocarbon (benzyltoluene) and a saturated hydrocarbon (n-decane) as capacitor impregnant, to compare their behavior in high fields. The results are used to determine the voltage to apply to these impregnated capacitor models during accelerated electrical aging without discharge occurrence. The measurements indicate that, during an aging test at 4.1 kV, no ... View full abstract»

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  • Influence of water on the dielectric response of natural mordenite

    Publication Year: 1992, Page(s):553 - 555
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (68 KB)

    Summary form only given. Dielectric spectrometry methods have been used to achieve a better understanding of the dielectric response of mordenite from a Cuban deposit at variable humidity. Mordenite shows a bound dipole dielectric response and a low frequency dispersion response as the recovery theta increases. This is in agreement with the universal dielectric response theory and may be explained... View full abstract»

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  • Exoelectron spectroscopy of near-surface defects in insulators

    Publication Year: 1992
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (42 KB)

    Summary form only given. The author discusses exoelectron emission (EE) as an analytic and diagnostic technique, surveying its advantages, shortcomings, and potential applications in the physics and technology of dielectric materials. Some possible ways to accommodate EE better for R&D purposes are outlined.<> View full abstract»

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  • Space-charge dispersive transport in corona-charged dielectrics

    Publication Year: 1992
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (58 KB)

    Summary form only given. The authors suggest a model of space-charge dispersive transport in noncrystalline dielectrics under the condition of continuous surface carrier injection (corona charging). They consider a sample under open-circuit conditions with rear electrode grounded. Dispersive transport of injected space charge is described within the framework of the carrier multiple-trapping model... View full abstract»

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  • Radiation-induced conductivity and charge storage in irradiated dielectrics

    Publication Year: 1992
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (46 KB)

    Summary form only given. A theory of radiation-induced conductivity and space-charge build-up in disordered dielectrics under continuous irradiation with charged particles or gamma-rays is developed for arbitrary spatial distributions of carrier generation and charge deposition rates. Open-circuit conditions are analyzed with one electrode (either rear or front) grounded. Analytical solutions for ... View full abstract»

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  • Non-Langevin recombination in disordered dielectrics

    Publication Year: 1992
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (40 KB)

    Summary form only given. Negative transient RIC (radiation-induced conductivity) in short-circuited samples and nonmonotonic increase of radiation-induced space-charge density have recently been observed for polymers (low-density polyethylene, polytetrafluoroethylene) and inorganic dielectrics (MgO, CaF/sub 2/, AlN, LiNiO/sub 3/). These experimental data are analyzed, and it is shown that such a b... View full abstract»

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  • Charge storage and transport in dielectrics with negative correlation energy traps

    Publication Year: 1992
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (38 KB)

    Summary form only given. A number of dielectric materials contain traps with negative correlation energy. A model of charge accumulation and decay that takes into account the capture of charge carriers by such traps, leading to the formation of neutral one-electron D/sub 0/ states and the subsequent tunnel interaction of these states according to the 2D/sub 0/ to D/sub +/+D/sub -/ reaction, is dev... View full abstract»

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  • A novel technique of charge centroid evaluation in dielectric films

    Publication Year: 1992
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (42 KB)

    Summary form only given. An attempt is made to develop a measuring technique for charge density and its centroid evaluation in dielectric layers without metal contacts. The main idea is the utilization of two vibrating probes located on both sides of the investigated dielectric film. The proposed technique has been shown to be effective for different types of dielectric layer without surface traps... View full abstract»

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  • Prebreakdown channels on the splits of dielectric films

    Publication Year: 1992
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (53 KB)

    Summary form only given. A novel approach to the investigation of physical phenomena in leakage channels leading to breakdown in dielectric films is discussed. It was shown previously that the properties of leakage channels in thin amorphous dielectric films are identical to those revealed on the relevant specially fabricated splits. The investigated films were deposited on metal (low-resistance c... View full abstract»

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  • Proceedings of the 4th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.92CH3034-6)

    Publication Year: 1992
    Request permission for commercial reuse | PDF file iconPDF (10 KB)
    Freely Available from IEEE
  • High-frequency dielectric characteristics of surge attenuating semiconductive cable compounds

    Publication Year: 1992, Page(s):11 - 15
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (88 KB)

    A novel model for the propagation of surges in solid dielectric transmission and distribution cables has recently been developed. The theory accurately predicts the relatively large high-frequency attenuation of such cable systems, which results from the displacement current passing through the semiconductive cable shields. A brief description of this theory provides the basis for describing the p... View full abstract»

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  • Staining of water trees with methylene blue explained

    Publication Year: 1992, Page(s):456 - 460
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    Staining with a methylene blue solution, a popular technique for achieving the required high contrast images of water trees, was carried out at 70°C. It is shown that methylene blue stains the complete tree, which justifies water tree length measurements after staining. The water tree is not stained exclusively, but rather faster and probably to a higher degree than the polyethylene. Comparing... View full abstract»

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  • Charge behavior in LDPE at polarity reversal and various DC voltages

    Publication Year: 1992, Page(s):6 - 10
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    The space charge distribution in multi-ply polymeric dielectrics at different DC voltage loads and with polarity reversal is analyzed. The space charge distributions at the metal-polymer interface and polymer-polymer interface were observed by a pulsed electroacoustic method. The electric field distribution was also calculated according to the space charge distribution. Low-density polyethylene (L... View full abstract»

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  • Water tree retardation and electrical properties of EVA blended XLPE

    Publication Year: 1992, Page(s):451 - 455
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    The water tree retardation effect of EVA (ethylene vinyl acetate) blended XLPE (cross-linked polyethylene) was investigated. In addition to water tree tests such electrical properties as dissipation factor and AC breakdown strength and such mechanical properties as Young's modulus and toughness were also studied, because the performance of insulating materials cannot be estimated only on the basis... View full abstract»

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  • Polarization phenomena in synthetic polymeric insulators

    Publication Year: 1992, Page(s):1 - 5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    It is shown that studies of absorption current, TSDC (thermally stimulated discharge current), and TTC (thermal transient current) provide useful information on dielectric polarization in synthetic polymer insulation. Particular results are presented on the time dependence of charging and discharging currents in polypropylene over the temperature range 87-373 K at a constant field of 6.67×10... View full abstract»

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  • The mechanisms of vented water tree growth

    Publication Year: 1992, Page(s):445 - 450
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    The water around a field enhancing defect in a tree retardant insulation was measured, and the factors which influence vented tree growth in conventional XLPE (cross-linked polyethylene) insulation were investigated. In both experiments the growth sites were examined by infrared spectroscopy less than ten minutes after the applied voltage was removed. The water tree retardant insulation was strong... View full abstract»

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  • Optical measurement of breakdown processes in polymethylmethacrylate under nanosecond pulse voltage application

    Publication Year: 1992, Page(s):348 - 352
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    High-speed framing photography has revealed the propagation velocity of breakdown channel in polymethylate (PMMA) to be between 30 and 120 kmf/s for positive 50-kV point voltage. The waveforms of the prebreakdown current in PMMA are essentially the same as those in liquid dielectrics. The breakdown time lag was precisely measured from the current. A linear relation between formative time lag and g... View full abstract»

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  • Influence of conductive particles on the impulse flashover of disc spacer in compressed SF6

    Publication Year: 1992, Page(s):256 - 260
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    The influence of a conductive particle fixed on the spacer surface on the impulse flashover value in compressed SF6 was investigated experimentally. Both smooth and corrugated spacer surfaces were studied. The results show that the metal particle could reduce the impulse flashover level by about 33%. It is also shown that the tangential component of the field strength is mainly responsi... View full abstract»

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  • The spatial distribution and electrical parameters of partial discharges in polyethylene insulation during ageing

    Publication Year: 1992, Page(s):209 - 214
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    The change of discharge parameters obtained from large bandwidth electrical and optical measurements is related to ageing phenomena in polyethylene voids. Discharge-pulse shape, ignition voltage, and spatial distribution were monitored in disc-shaped polyethylene voids for 100 hrs. Optical and electrical results are related to the mechanism of the discharge and the dimensions of the void. Primaril... View full abstract»

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  • Morphological aspects of water treeingin Co60 γ-ray irradiated polyethylene

    Publication Year: 1992, Page(s):440 - 444
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    To understand the effect of crosslinking in polyethylene on the water tree propagation, low-density polyethylene (LDPE) and Co60 γ-ray irradiated polyethylene were used for water treeing tests. Injection molded samples were made of LDPE using the CNRS laboratory model, and some of them were irradiated at different dose rates to produce crosslinking. The aged specimens were subjec... View full abstract»

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  • A new computer-aided measuring system for fundamental PD-studies

    Publication Year: 1992, Page(s):166 - 170
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    PD (partial discharge) monitoring in combination with time-resolved measurements is demonstrated to be a suitable tool for insulation diagnosis. Apart from statistical interpretations of phase-resolved PD patterns for fault recognition, description of material degradation and prediction of lifetime expectancy is desired. Time-resolved measurements yield information about physical processes within ... View full abstract»

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  • Final breakdown in field-aged XLPE

    Publication Year: 1992, Page(s):353 - 357
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    Water tree growth in field-aged cross-linked polyethylene (XLPE) was investigated. The tests were performed on 600-μm-thick ribbons peeled off from a field-aged 28-kV cable. Water tree growth in the samples saturated at around 70% of sample thickness after 12000 hours of aging, probably due to ion consumption. Ion concentration of the electrolyte solution influenced water tree growth. No correl... View full abstract»

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