110 kV變壓器直流電阻不平衡缺陷分析
張云1,王云龍1,程林峰1,陳兆光2
(1 廣東電網(wǎng)有限責任公司惠州供電局,廣東 惠州 516003;2 中國能建集團廣東電力設備廠有限公司,廣東 廣州 510285)
摘 要:繞組相間或線間直流電阻不平衡率超標是常見的變壓器缺陷。介紹了一起110 kV變壓器輕瓦斯保護動作事件,通過現(xiàn)場試驗數(shù)據(jù)分析,發(fā)現(xiàn)該主變變高繞組直流電阻不平衡,其中C相變高繞組直流電阻偏大。綜合油色譜試驗數(shù)據(jù),初步判斷出故障部位,經返廠解體檢查,確認是繞組出線與引線壓接不到位,導致繞組直流電阻不平衡率超標,并對裸銅線冷壓焊接工藝提出了改進措施以預防類似問題再次發(fā)生。
關鍵詞:變壓器;直流電阻;輕瓦斯保護;繞組出線;引線;冷壓焊接
中圖分類號:TM406 文獻標識碼:B 文章編號:1007-3175(2018)04-0053-03
Analysis of Unbalance Defect of DC Resistance in 110 kV Transformer
ZHANG Yun1, WANG Yun-long1, CHENG Lin-feng1, CHEN Zhao-guang2
(1 Huizhou Power Supply Bureau of Guangdong Power Gird Corporation, Huizhou 516003, China;
2 Guangdong Electric Power Equipment Factory Co., Ltd, of China Energy Construction Group, Guangzhou 510285, China)
Abstract: The imbalance rate of direct current (DC) resistance between winding and line is the common transformer defect. This paper introduced an 110 kV transformer light gas protection action event. Through field test data analysis, it was found that the high-voltage winding DC resistance of main transformer was unbalanced, among which the phase-C high-voltage winding DC resistance was too large. After the oil chromatography test data was synthesized, the trouble location was initially judged. Inspection of disassembly affirmed that the winding outlet and lead wire were not crimped in place to lead to the imbalance rate of winding DC resistance exceed the standard, and for the process of bare copper wire cold pressing welding, this paper proposed the improvement measures to guard against the similar problems occurring again.
Key words: transformer; direct current resistance; light gas protection; winding outlet; lead wire; cold welding
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