氧化锌避雷器直流参考电压及泄漏电流试验方法研究

Study on Test Method of Direct Current Reference Voltage and Leakage Current of Zinc Oxide Arrester

氧化锌避雷器1mA下的直流参考电压及75%该参考电压下的泄漏电流试验,有利于检查氧化锌避雷器直流参考电压及氧化锌避雷器在正常运行中的荷电率,对于判定其老化状态十分重要。对于已经投运的氧化锌避雷器需要依据预防性试验规程定期开展该项试验,在试验时为降低作业风险,提高试验效率,通常需要采用不拆引线的方式开展此项试验,文章对于两节结构的220kV避雷器1mA下的直流参考电压及75%该参考电压下的泄漏电流试验方法进行了研究,以期为相关人员提供参考。

The DC reference voltage and leakage current test at 75%of the reference voltage of the zinc oxide lightning arrester at 1 mA are beneficial for checking the DC reference voltage and charging rate of the zinc oxide lightning arrester during normal operation,and are crucial for determining its aging status.For zinc oxide lightning arresters that have already been put into operation,it is necessary to conduct this test regularly in accordance with the preventive testing regulations.In order to reduce operational risks and improve testing efficiency,it is usually necessary to conduct this test without removing the leads.This article studies the DC reference voltage at 1 mA and the leakage current test method at 75%of the reference voltage for a 220 kV lightning arrester with two sections of structure,in order to provide reference for relevant personnel.