GIS超聲波局部放電檢測方法與現(xiàn)場應(yīng)用
郭超，楊新春，朱虎，周波，羅楊，程鵬，田子山
（國網(wǎng)成都供電公司，四川 成都 610041）
摘 要：對氣體絕緣全封閉組合電器(GIS) 進(jìn)行帶電檢測，可盡早發(fā)現(xiàn)各種缺陷，減少GIS 發(fā)生故障的概率。使用超聲波檢測法對某330 kV 變電站GIS 進(jìn)行檢測，發(fā)現(xiàn)110 kV Ⅱ母與11392 刀閘相連的母線氣室存在異常信號，信號相對背景差異較大，同時具有50 Hz 相關(guān)性且波形較陡，疑似尖端放電缺陷。通過幅值定位、頻域定位和時差定位法對放電源進(jìn)行正確定位，根據(jù)信號強(qiáng)度判斷出該缺陷屬于嚴(yán)重缺陷。應(yīng)用效果表明，超聲波法在變電站GIS 局部放電帶電檢測中效果良好，普測能以較高靈敏度發(fā)現(xiàn)缺陷，復(fù)測能以較高準(zhǔn)確度定位缺陷。
關(guān)鍵詞：氣體絕緣全封閉組合電器；超聲波；局部放電；尖端放電；定位
中圖分類號：TM595 文獻(xiàn)標(biāo)識碼：B 文章編號：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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