GIS超声波局部放电检测方法与现场应用
 

郭超，杨新春，朱虎，周波，罗杨，程鹏，田子山
（国网成都供电公司，四川 成都 610041）
 

    摘 要：对气体绝缘全封闭组合电器(GIS) 进行带电检测，可尽早发现各种缺陷，减少GIS 发生故障的概率。使用超声波检测法对某330 kV 变电站GIS 进行检测，发现110 kV Ⅱ母与11392 刀闸相连的母线气室存在异常信号，信号相对背景差异较大，同时具有50 Hz 相关性且波形较陡，疑似尖端放电缺陷。通过幅值定位、频域定位和时差定位法对放电源进行正确定位，根据信号强度判断出该缺陷属于严重缺陷。应用效果表明，超声波法在变电站GIS 局部放电带电检测中效果良好，普测能以较高灵敏度发现缺陷，复测能以较高准确度定位缺陷。
    关键词：气体绝缘全封闭组合电器；超声波；局部放电；尖端放电；定位
    中图分类号：TM595     文献标识码：B     文章编号：1007-3175(2017)10-0054-06
 

Ultrasonic Detection Method for Gas Insulated Switchgear Partial Discharge and Its Field Application

 

GUO Chao, YANG Xin-chun, ZHU Hu, ZHOU Bo, LUO Yang, CHENG Peng, TIAN Zi-shan
（State Grid Chengdu Power Supply Company, Chengdu 610041, China）
 

    Abstract: To conduct live detection for the gas insulated switchgear (GIS) could make various defects found as early as possible, so as to reduce the probability of GIS failure. The ultrasonic method was used to conduct detection for the GIS in certain 330 kV substation to find the existing abnormal signals between 11 0 kV busbarⅡand disconnector 11 392 busbar air chamber. The signal was greatly different from the background signal with 50 Hz dependency and sharp pulse. The defect was suspected as point discharge. The discharge source was located by amplitude method, frequency domain method and time difference method. The defect level was decided by the amplitude. The ultrasonic detection method has good filed application effect in the live detection for the GIS of power transformer station and it can find out the defects with high sensitivity in the normal detection and locate the defects with high accuracy in the retest.
    Key words: gas insulated switchgear; ultrasonic; partial discharge; point discharge; location

 

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