Influence of bulk dielectric polarization upon partial discharge transients: Effect of void geometry and orientation

Iain Wilson McAllister, G.C. Crichton

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    The induced charge arising from a partial discharge consists of 2 components. One is associated with the actual space charge in the void. The other is related to changes in the polarization of the bulk dielectric. These changes are a direct consequence of the field produced by the space charge. The influence of the void geometry upon the polarization component of the induced charge is examined for a heterogeneous bulk dielectric system. It is demonstrated that, depending on the ratio of the dielectric permittivities and within which dielectric the void is located, the relative magnitude of this component may increase or decrease. The magnitude of this effect is also strongly dependent upon the prolateness/oblateness of the void geometry, and on the orientation of the void with respect to the detecting electrode.
    Original languageEnglish
    JournalIEEE Transactions on Dielectrics and Electrical Insulation
    Issue number2
    Pages (from-to)240-247
    Publication statusPublished - 2005

    Bibliographical note

    Copyright: 2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE


    • spheroidal voids
    • Partial discharge transients
    • dielectric polarization
    • heterogenous bulk dielectric


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