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[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
  • Electrical study of model composites material

    Publication Year: 1992, Page(s):72 - 76
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    In order to avoid diffusion, accumulation, or other problems of charge migration in interface zones that occur in real composites, the authors develop new model materials. In a first step, the reinforcement is a metallic layer. Simple electrical measurements lead to permittivity values that can be compared with those predicted by different models. The developed multilayer materials can be used as ... View full abstract»

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  • Influence of oxygen on AC treeing at high temperature

    Publication Year: 1992, Page(s):313 - 317
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    The influence of oxygen on AC tree initiation in LDPE (low-density polyethylene) in the temperature range of 25-100°C is studied experimentally, using both a semiconducting polyethylene electrode and a steel needle electrode. It is shown that degassing treatment at 25°C suppresses tree initiation when the voltage is applied at 25 or 50°C, but not when voltage is applied at 75 or 100&de... View full abstract»

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  • Influence of ageing conditions on water tree growth processes

    Publication Year: 1992, Page(s):368 - 372
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    The influence of aging conditions on the processes which take place during water tree growth in XLPE (cross-linked polyethylene) is examined, and how the characteristics of the water trees are influenced is considered. As a special case, an experiment is reported addressing the question of whether adapted needle tests on XLPE can simulate water treeing in service. It is shown that water trees grow... View full abstract»

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  • Breakdown phenomena in power integrated packages

    Publication Year: 1992, Page(s):492 - 497
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    Tests have been performed on a test pattern designed to study the effects of applying voltage to the inside of the package. The need to apply high voltage to the internal connections of the package, without discharges occurring outside the package, has led to the design of a metal frame having only two leads spaced 16 mm apart. Specimens having three different distances between the bonding pads (6... View full abstract»

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  • The effect of temperature cycling on the DC conductivity of polyethylene

    Publication Year: 1992, Page(s):67 - 71
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    The effect of temperature cycling between 40°C and 80°C during combined temperature and electric field conditioning on the DC conductivity of LDPE (low-density polyethylene) has been studied and compared with DC conductivity results using a constant temperature of 80°C and an identical sample under the same experimental conditions. Results indicate that the drop in the current level at... View full abstract»

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  • Fractal characteristics of real electrical trees

    Publication Year: 1992, Page(s):318 - 322
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    The fractal properties of 2-D projected electrical trees in PMMA (polymethyl methacrylate) and XLPE (cross-linked polyethylene) samples have been investigated. The results show that the tree structures are fractal objects although their tree patterns are obtained in a 2-D projection. The fractal dimension of the tree formed in PMMA is found to become constant as the applied voltage or the time dur... View full abstract»

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  • Dielectric properties of single water trees

    Publication Year: 1992, Page(s):373 - 377
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    An experimental approach involving the study of the electrical properties of single trees extracted from field-aged cables has been applied. The authors present first results on the measurement of the permittivity parallel and perpendicular to the tree growth direction, i.e. to the field direction in the cable. Capacitance measurements on single water trees, extracted from field-aged cables, show ... View full abstract»

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  • Synergistic effect of electric field and temperature on the ageing of LPDE in contact with electrolyte solution

    Publication Year: 1992, Page(s):428 - 432
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    The synergistic effect of electric field and temperature on the ageing of low-density polyethylene (LDPE) was studied by thermally stimulated creep spectroscopy and Fourier-transform infrared spectroscopy, using deionized H2O and NaBr as electrolytes. Insulating polymeric materials generally consist of a mixture of ordered crystals and amorphous regions, resulting in interphase paracrys... View full abstract»

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  • Space charge and breakdown of poly-p-xylylene thin film

    Publication Year: 1992, Page(s):488 - 491
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    The breakdown strength of PPX (poly-p-xylylene) and space charge effects have been investigated. Temperature and thickness dependences of the breakdown strength of PPX supported avalanching as the breakdown mechanism. This is consistent with the results on high-field conduction of PPX. The prestress effect revealed a large influence of space charge on the breakdown strength of PPX, and dependence ... View full abstract»

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  • Simulation of the ferroelectric switching of PVDF and its copolymers

    Publication Year: 1992, Page(s):62 - 66
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (140 KB)

    Computer simulation results on the ferroelectric switching of PVDF (polyvinylidene fluoride) and its copolymers are presented. A two-dimensional model of β-PVDF (two-state or four-state) is considered. A Monte Carlo method is used for nucleation and growth simulations. The parameters studied and their influence on the polarization switching are shown in a number of plots. The results obtained... View full abstract»

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  • Ultra low-frequency dielectric properties of poly(vinylidene fluoride) in high fields

    Publication Year: 1992, Page(s):225 - 229
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (140 KB)

    The dielectric properties of poly(vinylidene fluoride) (PVDF) films stressed in a near-breakdown field from 10-1 Hz to 10 -5 Hz have been measured, using a picoammeter connected to a microcomputer. Nonlinear dielectric behavior in PVDF films in the frequency range below 10-2 Hz is observed. The experimental results are compared with the results obtained by Hamon's ... View full abstract»

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  • Filamentary electromechanical breakdown in polymers

    Publication Year: 1992, Page(s):323 - 327
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    Some early models of breakdown in polymers are reviewed. The proposal of H.R. Zeller et al. (1984) of electrofracture as an aging mechanism in which the growth of a filamentary (i.e. tubular) crack through a dielectric is caused by electrostatic forces is discussed, and the nature of filamentary electromechanical breakdown is examined. Experimental results in support of the filamentary model are s... View full abstract»

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