一起220 kV SF_6电流互感器二次电流异常故障分析
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摘要
针对电流互感器因制造工艺、维护不当等因素易导致设备缺陷或隐患的问题,基于某变电站220 kV SF_6电流互感器运行过程中出现的电流不平衡引起的保护动作故障,根据事故录波分析、诊断性试验结果及现场设备检查,判定故障原因为电流互感器靠母线侧串、并联搭接排间距不合格、雨天间隔内充水发生短路。通过理论分析及模拟不同雨水接触程度的变比测量试验,发现间隔积水时此电流互感器的变比能增至2 486∶1甚至更大,从而验证了分析的正确性。针对此次设备缺陷处理过程,对厂家制造工艺、设备安装调试和日常站内巡视提出了新要求,有利于隐患排查和电网安全稳定运行。
Manufacturing processes,improper maintenance and other factors easily lead to the equipment defects or hidden dangers of current transformers.Based on the protection operation caused by unbalance current of a 220 kV SF6 current transformer in a substation,after the fault recorded wave analysis,diagnostic test results and equipment inspection,the fault reason was judged as the unqualified spacing of string and parallel lap row on the bus side,which easily led to water short circuit within the rain interval.Through the theoretical analysis,the variable ratio measurement experiment of simulating different rainfalls contact,the results show that the ratio of current transformer can increase to 2 486:1 or even larger when the interval water was stagnant,the analysis was verified to be correctness.In response to the equipment defect handling process,new requirements were put forward to the manufacturers of manufacturing technology,equipment installation and daily routine inspection,and it was conducive to troubleshooting and security and stability of the power grid.
Manufacturing processes,improper maintenance and other factors easily lead to the equipment defects or hidden dangers of current transformers.Based on the protection operation caused by unbalance current of a 220 kV SF6 current transformer in a substation,after the fault recorded wave analysis,diagnostic test results and equipment inspection,the fault reason was judged as the unqualified spacing of string and parallel lap row on the bus side,which easily led to water short circuit within the rain interval.Through the theoretical analysis,the variable ratio measurement experiment of simulating different rainfalls contact,the results show that the ratio of current transformer can increase to 2 486:1 or even larger when the interval water was stagnant,the analysis was verified to be correctness.In response to the equipment defect handling process,new requirements were put forward to the manufacturers of manufacturing technology,equipment installation and daily routine inspection,and it was conducive to troubleshooting and security and stability of the power grid.
引文
[1] 刘超超,赵向阳.电流互感器二次侧回路状态检测装置研制[J].电测与仪表,2018,55(1):121-125.
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[8] 王伟,郑含博,韩金华,等.一起500kV电流互感器闪络故障原因分析[J].变压器,2016,53(9):64-67.
[2] 杨家辉,程建伟,张曦,等.500kV SF6电流互感器主绝缘故障的仿真分析[J].南方电网技术,2017,11(5):29-35.
[3] 吴西博,李璐,曲欣,等.一起500kV SF6电流互感器绝缘套管故障分析及预防[J].电瓷避雷器,2017(5):195-198.
[4] 李璐,许东升,胡润阁,等.一起500kV SF6电流互感器故障分析[J].变压器,2017,54(1):65-67.
[5] 周海滨,陈国华.500kV SF6电流互感器事故分析及预防措施[J].高压电器,2012,48(6):99-102,108.
[6] 苏治,韩广瑞,潘向华,等.接地故障电流入侵差动保护导致其误动作的实例分析[J].电力系统保护与控制,2014,42(20):135-139.
[7] Q/GDW1168-2013,输变电设备状态检修试验规程[S].北京:中国电力出版社,2013.
[8] 王伟,郑含博,韩金华,等.一起500kV电流互感器闪络故障原因分析[J].变压器,2016,53(9):64-67.