1000kV特高压避雷器泄漏电流异常缺陷分析

Comprehensive Analysis on Abnormal Defects of Leakage Current on 1000kV UHV Surge Arrester

针对某1 000 kV特高压变电站主变压器高压侧避雷器运行发现泄漏电流异常的情况,从避雷器瓷瓶污秽径向放电、表面泄漏电流干扰、电网电压谐波影响以及内部阀片受潮4个方面进行了全面分析,并采用有效措施进行了诊断,最后根据诊断的结论对避雷器进行了有针对性的停电检查和返厂处理,最终印证了其中的推论。所进行的分析与诊断对国内特高压避雷器的运维工作有一定的参考性。

According to the operation of the high voltage side lightning arrester of main transformer in a 1 000 kV UHV transformer substation, a comprehensive analysis was made on the abnormal leakage current in terms of the radial discharge of arrester porcelain insulator contamination, the interferenee of surfaee leakage current, the influence of voltage harmonies and the damp of valve elements. And effective measures were used to diagnose the fault. Finally, corresponding check and return treatment was made according to the diagnosis results, which proves the eorrectness of the diagnosis. The analysis and diagnosis in this paper can provide a reference for the service of UHV arresters.