Determination of the electric field on high voltage rubber insulators using the finite element method

The paper presents a study of electric field distribution on insulator strings, which are used for suspension of overhead transmission lines of 400kV and are stressed by power frequency voltage. The investigated insulator strings are used on transmission networks of National grid of Romania. The simulation uses the Finite Element Method (FEM) and COMSOL Multiphysics software to carry out the electric analysis on the insulators. It was used rubber insulators strings as the insulating material.