Proceedings of the 3rd International Conference on Conduction and Breakdown in Solid Dielectrics

3-6 July 1989

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Displaying Results 1 - 25 of 119
  • Tunneling transport in insulators

    Publication Year: 1989, Page(s):10 - 14
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (201 KB)

    A model for tunneling transport in insulators that includes the internal field in the tunneling effects is proposed. The model is verified by comparing the values of the estimated parameters in the low-field and high-field cases with experimental results. The relationship between the hopping conduction in terms of internal field and the usual approach of phonon-assisted tunneling is examined. It i... View full abstract»

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  • On the electrodynamics of partial discharges in voids in solid dielectrics

    Publication Year: 1989, Page(s):107 - 116
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2462 KB)

    It is suggested that a correct interpretation of partial-discharge transients can be obtained only through the concept of induced charge. The application of this concept enables a partial-discharge theory to be developed by means of which the influence of relevant void parameters can be assessed in a correct way. It is argued that the widely adopted abc-capacitance model does not allow this insigh... View full abstract»

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  • Electrical properties of some cobalt phthalocyanines

    Publication Year: 1989, Page(s):163 - 167
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (193 KB)

    The conductivity and dielectric properties of monomeric and polymeric cobalt phthalocyanine (CoPc) prepared under different conditions are discussed. All CoPc derivatives studied show very high specific conductivity as compared to microscopic-grade CoPc. The dielectric constants are frequency dependent, with the highest response occurring at the lower frequencies of the applied electric field, ind... View full abstract»

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  • High temperature modification of XLPE exposed to partial discharges

    Publication Year: 1989, Page(s):359 - 363
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (287 KB)

    Results of surface degradation studies of XLPE (cross-linked polyethylene) under corona discharges at elevated temperature are presented. Corona was applied for durations up to 24 hr, during which time the sample temperature was maintained constant at a selected value between 20 degrees C and 160 degrees C. Corona pulse-height distributions were monitored during the exposure period using a multich... View full abstract»

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  • Proceedings of the 3rd International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.89CH2726-8)

    Publication Year: 1989
    Request permission for commercial reuse | PDF file iconPDF (23 KB)
    Freely Available from IEEE
  • New exact computer analysis of the TSC curve by the asymptotic estimation method and an approach to the electrical conduction of organic crystals

    Publication Year: 1989, Page(s):587 - 591
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    Experimental results were obtained for a naphthacene-doped anthracene single crystal excited by Q-switched ruby laser pulses. Two representative TSC (thermally stimulated current) curves were obtained. The curves were analyzed by an asymptotic estimation method, involving the autoseparation of the TSC curve and the exact estimation of the energy depth of the carrier trap from the separate... View full abstract»

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  • Digital computer system for measurement of partial discharges in insulation structures

    Publication Year: 1989, Page(s):582 - 586
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    A digital discharge analyzer has been built for continuous and multiparameter registration of partial discharges. The measurements indicate that there are significant differences in the behavior of different discharge parameters for different voids. The registration of phase-position quantities is shown to give more information than just the registration of discharge magnitude versus time. Statist... View full abstract»

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  • Review of statistical testing of solid insulating materials

    Publication Year: 1989, Page(s):574 - 581
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    Different statistical methods used for the determination of the insulation characteristics of solid insulating materials are reviewed. Experimental results reported in the literature indicate that the breakdown probability of the test voltages is a function of the test method, of their parameters, and of the nature of the breakdown probability function. The application of statistical methods to es... View full abstract»

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  • Location and examination of defects in XLPE cable insulation

    Publication Year: 1989, Page(s):569 - 573
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    After breakdown testing of a cable it is difficult to identify the cause of the breakdown, because the insulation in the region of breakdown is usually heavily damaged. The authors describe an approach in which the insulation from cables extruded under normal conditions is peeled to form continuous lengths of thin tape. Results from AC breakdown tests of these tapes and microscopic and elemental a... View full abstract»

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  • Diagnosis of oxidation in XLPE cable by tan δ characteristics

    Publication Year: 1989, Page(s):267 - 271
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    The authors investigated the relationship between the density of oxidation products and the temperature dependence of tan δ in LDPE (low-density polyethylene) films. From a comparison of the temperature dependence of tan δ of PE in XLPE (cross-linked PE) cable with that of tan δ in PE film samples, it was found that tan δ gives accurate information about the oxidation in th... View full abstract»

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  • Effect of plasma polymer coating on the dielectric strength of polyethylene

    Publication Year: 1989, Page(s):374 - 376
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (88 KB)

    The authors have shown previously (1987) that a thin layer of plasma-polymerized ethylene deposited on the surface of high-density polyethylene suppresses the injection of carriers from the electrodes. Here they report the effect of this coating on the dielectric strength of high-density polyethylene. The polyethylene used is additive-free blown film with a density of 0.950 g/cm3 and a ... View full abstract»

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  • Dielectric breakdown and partial discharge in BaTiO3 ceramics

    Publication Year: 1989, Page(s):474 - 477
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (100 KB)

    The possibility of a correlation between partial discharge characteristics, breakdown strength, and microstructure of the ferroelectric ceramics is investigated. Breakdown field and partial discharge inception field were measured for pure BaTiO3 ceramics with different pore size distributions. The BaTiO3 ceramics used in this study were sintered at either 1300°C, 1350°... View full abstract»

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  • The electrical conductivity and breakdown phenomena in polyester polymer-quinoline salt of tetracyanoquinodimethane composites

    Publication Year: 1989, Page(s):158 - 162
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    The author studied the influence of the length of the conducting particle of the filler on the electrical conductivity of the composites obtained by embedding into polyester polymer needlelike conducting crystals of quinoline salt of tetracyanoquinodimethane. The results clearly demonstrated the importance of shape factors for the formation of a conducting network and percolative charge transport ... View full abstract»

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  • The compensation law and polymer aging and relaxations

    Publication Year: 1989, Page(s):321 - 325
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    It has been shown previously by the author (1957, 1984) that the relaxation of polyethylene (PE) can be well described by the rate theory. It is shown here that the rate theory applies to aging at temperatures below the melting temperature. It is also shown that the aging process has different energy parameters on the two sides of a thermodynamic transition. The importance of performing accelerate... View full abstract»

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  • Direct determination of space charge distributions in dielectrics: the pressure wave propagation method

    Publication Year: 1989, Page(s):548 - 554
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    The author reviews the various experimental techniques used to measure charge distributions in dielectrics. He then focuses on the pressure wave propagation method, discussing the principle of the method and techniques of pressure-wave generation. Examples of applications of the pressure-wave propagation method can be found in the fields of high-voltage insulation, piezoelectricity, irradiated mat... View full abstract»

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  • Water treeing: interaction between test temperature and other test parameters

    Publication Year: 1989, Page(s):500 - 506
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The authors discuss complementary studies on the effect of temperature on water tree growth, conducted at two different laboratories, using the same LDPE (low-density polyethylene) reference product at 23°C and 65°C, in a point-to-plane geometry. These very similar tests yielded totally contradictory conclusions on the effect of temperature on water tree growth. In one test the water trees... View full abstract»

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  • The influence of the polymer structure on the electrical properties

    Publication Year: 1989, Page(s):218 - 222
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    The TSDC (thermally stimulated depolarization current) method was used to study the effect of polymer structure on electrical properties for poly(phenylquinooxaline). Seven relaxation regions were distinguished in the TSDC spectrum. The probability of observing the regions depends strongly on the degree of annealing of the samples. The TSDC in PETP is also found to be influenced by the physical st... View full abstract»

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  • On the UV emission during electroluminescence of polyethylene and its implications on the ageing process

    Publication Year: 1989, Page(s):45 - 49
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    Using a very efficient scintillator whose electronic absorption lies in the ultraviolet-near-ultraviolet range, it is shown that excited states in the 5-eV range are created during ageing of polyethylene at a voltage level three times lower than the tree inception voltage. This energy is emitted in the form of luminescence or lost by nonradiative relaxation processes. Both of these can lead to che... View full abstract»

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  • Diagnostics of the volume distribution of conductivity in solids by electroacoustic methods

    Publication Year: 1989, Page(s):565 - 568
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (140 KB)

    The principles underlying the use of the acoustic probe and electrostriction methods for the nondestructive measurement of the volume distribution of the electric field intensity and charge density in solids are discussed. Acoustic probing consists of recording an electric signal generated by a charge or polarized sample under the action of a mechanical pulse causing a compression wave. The electr... View full abstract»

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  • New method for evaluation of water treeing properties of semiconductive materials

    Publication Year: 1989, Page(s):264 - 266
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (124 KB)

    An effort was made to develop a simple test method for evaluation of water treeing properties of semiconducting materials. The necessity of an interface between the semiconducting and the insulating parts of the test object, which well reproduce the interfaces in a triple extruded power cable, motivated the use of an object made partly from a coextruded tape. It is shown that the treeing performan... View full abstract»

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  • Influence of space charge on breakdown strength of PET foil

    Publication Year: 1989, Page(s):369 - 373
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (124 KB)

    Results of studies on the influence of the space charge implanted by corona charging or electron-beam irradiation on the electric strength of PET (polyethylene terephthalate) foil are presented. Values of impulse breakdown voltage as a function of corona charging voltage are presented for 36-μm and 180-μm PET foil samples. It is shown that for both thicknesses the breakdown voltage tends to ... View full abstract»

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  • Radiation effects in polymers

    Publication Year: 1989, Page(s):469 - 473
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (124 KB)

    A research program has been undertaken in which material is exposed to irradiation up to dose levels of 2 MGy. This represents the exposure anticipated over the lifetime of the material. Samples of epoxy resins and polyimide film were exposed to gamma rays from a Co source. Measurements of thermally stimulated discharge currents (TSDC) were made on all samples both before and after irradiation. Th... View full abstract»

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  • Transient photocurrents in tantalum pentoxide films

    Publication Year: 1989, Page(s):153 - 157
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (116 KB)

    The mechanism of conduction between a Ta2O5 film and a metal electrode was studied by means of photocurrent measurements. The nature of the metal/Ta2O5 interface is shown as well as the energy diagram deduced from the results. Transient current decaying with time has been observed in the Al/Ta2O5 interface and explained in terms of ... View full abstract»

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  • Thermally stimulated depolarization of kidney stone

    Publication Year: 1989, Page(s):317 - 320
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    Results of TSD (thermally stimulated depolarization) measurements of surgically removed kidney stones are reported. The measurements confirm the existence of the electret state in kidney stones, the TSD spectrum depending on the composition. The best electret-forming temperature (near body temperature) is lower than the temperature range studied; the choice of the latter was imposed by experimenta... View full abstract»

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  • Detection of high field AC conduction loss current in polymeric insulating materials

    Publication Year: 1989, Page(s):249 - 253
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    A novel method for the detection of high-field AC conduction loss current in polymeric insulating materials is developed. It uses the unbalanced operation of a current-comparator-type high-field tan-δ-capacitance bridge and the deconvolution technique for signal processing. Examples of the transfer function of this detection system for different amplifier gain levels are shown. Under certain... View full abstract»

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