Modelo eletrotérmico de um para-raios de óxido de zinco: simulação e experimentos.

Abstract

Zinc oxide surge arresters are protection equipments widely used in transmission and distribution systems. When submitted to thermal or electrical stress the surge arrester characteristics degenerates. Up to today there is no really conclusive surge arrester evaluation method. One of the most used techniques is the infrared thermography. The goal of this work is to implement a computational tool to help the measurements made by infrared thermography, in a way to obtain the temperature of the surge arrester active part. The computational tool uses as input data the electrical current through the surge arrester and the room temperature and outputs the thermal behavior of the surge arrester. It was implemented using C++ programming language, finite volumes, the "multiblock" technique and generalized coordinates.