交接试验中GIS内避雷器持续电流测量方法的改进

Improvement on the Measurement of Continues Current for the Lightning Arrester in GIS

避雷器的持续电流指的是在持续运行电压下流过避雷器的电流。当避雷器内部受潮时,其持续电流会增大,当避雷器电阻片存在老化缺陷时,持续电流中的阻性电流所占的比例会明显偏大。因此,在避雷器投运前,必须对避雷器进行持续电流测量。文中研究了现有的全封闭组合电器(GIS)内避雷器持续电流的测量方法,对其不足之处进行了分析并做出了改进,提出了一种新的GIS内避雷器持续电流的测量方法,适用于避雷器投运前的交接试验。

When the operating voltage applied to arrester continuously, the current flowing through the arrester is the continuous current. When the arrester internal is damp, the continuous current increases. When the arrester varistor aging, the resistive current of continuous current increases. Therefore, before the arrester put into operation, the continue arresters current must be measured. This paper studies the existing measurement methods for GIS arrester continuous current. According to shortcomings analysis, a new method for GIS arrester continuous current measurement is proposed.