IEE Proceedings A - Physical Science, Measurement and Instrumentation, Management and Education - Reviews

Issue 3 • April 1981

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Displaying Results 1 - 11 of 11
  • Dielectric phenomena

    Publication Year: 1981
    IEEE is not the copyright holder of this material | PDF file iconPDF (137 KB)
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  • Low temperature dielectric loss spectra of polyolefins

    Publication Year: 1981, Page(s):146 - 152
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (976 KB)

    Antioxidants which are 2, 6 di-tert-butyl phenol derivatives exhibit dielectric relaxations at liquid helium temperatures when dispersed in various nondipolar media including polyethylene and polypropylene. Other antioxidants should preferably be used for the insulation tape of AC superconducting power cables. By an appropriate isotopic substitution the effect is shown to be due to tunnelling of t... View full abstract»

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  • Field stimulated interfacial electron transfer

    Publication Year: 1981, Page(s):153 - 158
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (829 KB)

    The time dependence of the charging of insulators on contact with metal electrodes has been examined by determination of the charge after both multiple repeated contacts and time-varying, single contact as well as measuring the influence of applied fields in the charge transfer process. The practical aspects of these investigations have been exhibited by showing that microphony in polymer insulate... View full abstract»

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  • Magnesium oxide as a high-temperature insulant

    Publication Year: 1981, Page(s):159 - 164
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (702 KB)

    Magnesium oxide is widely used as a high-temperature insulant in the form of compacted powder. The reasons for its selection, and the nature of electrical conduction in refractory oxides at high temperatures, are discussed. The literature dealing with conduction in single crystals is reviewed, and results of resistivity measurements on compressed powders are reported. These show the effects on pow... View full abstract»

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  • Ion conduction through paper and polypropylene foils impregnated with liquid dielectric

    Publication Year: 1981, Page(s):165 - 173
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1458 KB)

    In order to improve our knowledge of the impregnated materials, we have focused our work on polypropylene and capacitor grade papers. In addition to electrical measurements (permittivity, conductivity versus voltage, time, temperature), we made a study of the porous structure of the materials using electron microscopy, the bubble breakthrough method, permeation of gas and liquid under a hydrostati... View full abstract»

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  • Electron-beam-induced conductivity and related processes in insulating films

    Publication Year: 1981, Page(s):174 - 182
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1440 KB)

    The theoretical model for electron-beam-induced conductivity in thin insulating films is reviewed and its application to gain measurements in several different insulating materials is discussed. The ideas incorporated in the model suggest a technique for investigating trapping levels in insulators, using the electron beam as a means of populating the traps. It is suggested that, in addition to det... View full abstract»

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  • AC loss and DC conduction mechanisms in polyethylene under high electric fields

    Publication Year: 1981, Page(s):183 - 192
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1083 KB)

    The paper describes extensive experimental investigations concerning AC loss and DC conduction in polyethylene (PE) subjected to strong electric fields up to about l00kV/mm. Based on an electronic charge carrier hopping transport model including trap-like and donor-like states it is shown that the current is bulk-limited under both AC and DC conditions. However, the sources of the electronic charg... View full abstract»

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  • Assessing the resistance of polymers to electrical treeing

    Publication Year: 1981, Page(s):193 - 201
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1269 KB)

    The susceptibility of polymeric insulating materials to breakdown by `treeing¿¿ has impeded their utilisation as insulation for high voltage cables. This review surveys the results of tests used to investigate tree initiation and propagation and discusses factors which affect the resistance of materials to breakdown by treeing and the mechanisms involved. Several test procedures can provide reprod... View full abstract»

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  • Anomalous behaviour of dielectric dispersion properties of evaporated silicon oxide films under DC high electric fields

    Publication Year: 1981, Page(s):202 - 208
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (869 KB)

    It is observed that AC dispersion properties of evaporated silicon oxide film are largely affected by a DC biasing voltage. This anomalous effect is explained in connection with the previously reported experimental results of electrically excited thermally stimulated current (ETSC). Numerical calculation of this effect is based on a two-site hopping model and taking into consideration the internal... View full abstract»

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  • Photographic investigation of formative stage of electric breakdown in diverging fields

    Publication Year: 1981, Page(s):209 - 214
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (987 KB)

    A photographic investigation of luminescence in point-plane specimens of solid dielectric is described. Tests were performed with impulse voltages of both polarities on specimens having ratios of thickness t to pin radius r extending from 20 to 250. When t/r < 100, collapse of voltage accompanied luminescence, whose spatial and temporal development was recorded using a streak camera. In those s... View full abstract»

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  • Aspects of the development of dielectrics for radio frequency submarine telephone cables

    Publication Year: 1981, Page(s):215 - 224
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1742 KB)

    Future insulation requirements for radio-frequency submarine telephone cables are postulated. A new apparatus is described that enables dielectric loss of low-loss (¿¿ 50 ¿¿rad) materials to be measured under factory conditions over the frequency range of 0.1 to 200 MHz with a repeatability of ¿¿ one¿¿rad. Dielectric loss curves for samples of low density polyethylene, high density polyethylene, t... View full abstract»

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Aims & Scope

Published from 1980-1988, IEE Proceedings A contained significant and original contributions on physical science, measurement and instrumentation, management and education, and reviews (specially commissioned articles written by specialists reviewing topics in depth for the professional electrical and electronics engineer).

Full Aims & Scope