Modélisation et simulation des isolateurs par la méthode des eléments finis

Abstract

Flashover of insulators in transmission and distribution systems may cause costly outages for power companies and their customers. The voltage distribution along the insulator is affected by the stray capacitances. The existence of any stray capacity will cause a non-uniform voltage distribution which is created by the leakage currents. In this work, we present simulation and modelling of the electric voltage, the leaking current, the electric field in insulator cap and pin en glass. The numerical calculation of the potential by the finite element method is a very effective approach. For the case of fog conditions, pollution layers on the insulator will become conducting and could result in a significant redistribution of the voltage. The equivalent circuit is employed to simulate the effects of the capacitive coupling to polluted layers on the insulator.