Influence of bulk dielectric polarization upon partial discharge transients effect of heterogeneous dielectric geometry

I.W. McAllister, G.C. Crichton
2000 IEEE transactions on dielectrics and electrical insulation  
A physically valid theory of partial discharge (pn) transients is based upon the conccpt of tlie charge induced uyoii the detecting electrode by the PD. This induced chargc consists of two components. Oiic is associatcd with thc actual space charge iii the void, while the nthcr is rclatcd tn changcs in thc polarization of the bulk dielectric. These changes are brought about by thc ficld produced by thc space charge. The magnitude of the induced charge and its components are examined for scveral
more » ... hctcrogcncous dielectric systems. It is demonstrated that, in relation to a hninogcncous diclcctric systc~n, thc magnitude of the induced charge either increases or decreases depending nil the ratio of thc diclcctric pcrmittivities and within which dielectric the void is located. It is shown that this behavior is directly related to the magnitude and polarity of the potarization component of the iiidriccd charge. Furtherinare, we demonstrate that tlie geometry of the dietectric system and the physical diincnsions of the different dielectrics inflticncc in a similar manner the inagnititde of the induced charge, although to a lcsscr dcgrcc.
doi:10.1109/94.839350 fatcat:zmekzkxyr5ecrdyxajhmj6eofa