Charge Simulation Modeling of Practical Insulator Geometries

A brief review of the charge simulation technique used for the calculation of high voltageelectrostatic fields, and its application to a typical transmission line disc insulator sectionunder pollution-free conditions, is presented. The use of ring and line charges has been found to be quite adequate for the modeling of the field distribution in and around the insulator with an accuracy in the representation of electrode potentials well within 1% of the maximum potential difference. The discrepancy in representing the inter-dielectric interface conditions is usually a maximum of about 9% but may be as large as 17% for the tangential electric field.