一臺變壓器鐵芯多點接地故障的處理
曹小龍1，陳平1，曹小虎2，吳棟梁1，雷乘龍1
1 甘肅省天水供電公司，甘肅 天水 741020；2 甘肅省電力公司檢修公司，甘肅 蘭州 730000
摘 要：介紹了一臺主變壓器的故障實例，分析油色譜跟蹤數據，采用各種判斷方法認為變壓器有發生鐵芯多點接地故障的可能，經停運檢查證實了色譜分析結論。根據現場條件采用鐵芯加壓法來處理故障，交流耐壓試驗表明鐵芯多點接地故障已消除，結合故障處理過程，給出了確保變壓器正常運行的預防措施。
關鍵詞：變壓器；色譜分析法；過熱性故障；鐵芯多點接地
中圖分類號：TM411 文獻標識碼：B 文章編號：1007-3175(2014)08-0050-04
Trouble Shooting for a Transformer Iron Core Multiple Spots Grounding Fault
CAO Xiao-long1, CHEN Ping1, CAO Xiao-hu2, WU Dong-liang1, LEI Cheng-long1
1 Gansu Tianshui Power Supply Company, Tianshui 741020, China; 2 Gansu Power Grid Maintenance Overhaul Company, Lanzhou 730000, China
Abstract: Introduction was made to a fault actual example of a set of main transformer. This paper analyzed oil spectrum tracking data and adopted a variety of judgement methods to consider that there was possible of transformer with multiple spots grounding fault taking place, and tieup examination proved spectrum analysis conclusion. According to site conditions, an iron core pressure adding method was adopted to have trouble shooting. The AC withstanding voltage test shows that the iron core multiple spots grounding faults have been shoot out. Combined with trouble shooting process, this paper gave the prevention measures to ensure normal transformer operation.
Key words: transformer; spectrum analysis method; over heating fault; iron core multiple spots grounding
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