Comportamento das perdas em para-raios de óxido de zinco na região de baixa corrente.

Abstract

In zinc oxide arresters, it will be sparks, there is a leakage current flowing constantly under continuous operating regime. As the resistive component of the total leakage current is responsible for the losses and for the change of characteristic V - 1, it is necessary to study the behavior of zinc oxide elements in the low current region. This work experimentally verifies the thermal stabilization process through the electrical parameters voltage and current and the changes of characteristic V-I with absorption of current impulses. The results show that zinc oxide elements have a high absorption capacity of these impulses and that the changes in their characteristics are not pronounced to the point of causing them to thermal instability.