Boundary element studies on insulator shape and electric field around HV insulators with or without pollution

Capacitive-resistive field computations are carried out around post-type Hv insulators of varying shapes. The boundary element method (BEM) has been e mployed for electric field computations. Different insulator shapes have be en obtained by varying several parameters, which define the shape of the Hv insulator contour. For each insulator shape, the maximum stress occurring on the insulator surface has been determined with no surface pollution, uni form surface pollution and also partial surface pollution. For partial poll ution, several cases have been studied, in which different sections of the insulator surface are polluted. Furthermore, the effect of electrode radius on the maximum stress on insulator surface has been investigated. The resu lts obtained are presented in this paper in detail.