Suzhou Electric Appliance Research Institute
期刊号: CN32-1800/TM| ISSN1007-3175

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110 kV变压器直流电阻不平衡缺陷分析

来源:电工电气发布时间:2018-04-18 15:18 浏览次数:586
110 kV变压器直流电阻不平衡缺陷分析
 
张云1,王云龙1,程林峰1,陈兆光2
(1 广东电网有限责任公司惠州供电局,广东 惠州 516003;2 中国能建集团广东电力设备厂有限公司,广东 广州 510285)
 
    摘 要:绕组相间或线间直流电阻不平衡率超标是常见的变压器缺陷。介绍了一起110 kV变压器轻瓦斯保护动作事件,通过现场试验数据分析,发现该主变变高绕组直流电阻不平衡,其中C相变高绕组直流电阻偏大。综合油色谱试验数据,初步判断出故障部位,经返厂解体检查,确认是绕组出线与引线压接不到位,导致绕组直流电阻不平衡率超标,并对裸铜线冷压焊接工艺提出了改进措施以预防类似问题再次发生。
    关键词:变压器;直流电阻;轻瓦斯保护;绕组出线;引线;冷压焊接
    中图分类号:TM406     文献标识码:B     文章编号: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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