基于超声波法的GIS局部放电测试及分析

Partial Discharge Testing of Gas Insulated Switchgear and Analysis Based on Ultrasonic Method

介绍了引起气体绝缘开关设备(GIS)局部放电的主要缺陷,分析了基于超声波法的GIS局部放电测试的原理、试验接线及注意事项,对部分变电站GIS设备进行了超声波局部放电测试。经测试结果分析表明,若周期峰值小于15 mV,应以跟踪监测为主;若大于15 mV,应考虑进行分合闸操作,再进行复测,如果信号消失,信号由动静触头接触不良引发的可能性较大,若分合闸不能消除信号,建议停电检查。

Introduction was made to the major defects causing partial discharge of gas insulated switchgear. Analysis was made to the principle of gas insulated switchgear （GIS） partial discharge testing based on the ultrasonic method, test connection, advertent items. Part of GIS equipment in subordinated substations was carried out partial discharge testing based on the ultrasonic. The testing results analysis shows that tracking and monitoring were given priority when the periodic peak value was less than 15 mV; breaking and closing were considered when the periodic peak value was more than 15 mV, and then repetition measurement was carried out. If the signals disappeared, it was more possible for the moving and fixed contacts to turn up bad contact. If the signals didn’t disappear, power cut and examine were suggested.