电流互感器密封失效引起的绝缘故障  

Insulation Fault Caused by Current Transformer Seal Failure

作　　者：李予全 寇晓适 张少锋 邵颖彪 赵永峰 朱华 张逸凡 郑含博 LI Yuquan;KOU Xiaoshi;ZHANG Shaofeng;SHAO Yingbiao;ZHAO Yongfeng;ZHU Hua;ZHANG Yifan;ZHENG Hanbo(State Grid Henan Electric Power Research Institute,Zhengzhou 450052,China;State Grid Henan Electric Power Company,Zhengzhou 450052,China;Guangxi University,Nanning 530000,China)

机构地区：[1]国网河南省电力公司电力科学研究院,河南郑州450052 [2]国网河南省电力公司,河南郑州450052 [3]广西大学,广西南宁530000

出　　处：《中国电力》2020年第11期147-153,174,共8页Electric Power

基　　金：国家自然科学基金资助项目(表征变压器绕组热点纸绝缘老化的乙醇特征量及其生成机理研究,51907034)。

摘　　要：首先介绍了油浸式电流互感器和SF6电流互感器的整体绝缘结构,以近期多地出现的电流互感器绝缘故障为切入点,分析了电流互感器绝缘击穿的原因。通过电流互感器的解体检查进一步推断出设备故障的根源为互感器密封失效,针对油浸式电流互感器的金属膨胀器渗漏、SF6电流互感器爆破片破损引发的密封失效现象,提出了运行维护建议和预防措施。Firstly,the insulation structures of oil-immersed current transformer(TA)and SF6 TA are introduced.And then,the causes of TA insulation breakdowns are analyzed based on an investigation of the insulation faults of TAs occurring in several cases.It is concluded through further disintegration examination that the seal failure is the root cause for insulation fault.Lastly,operation recommendations and precautions are presented for seal failure caused by the metal expander leakage of oil-immersed TA and the rupture disc damage of SF6 TA.

关 键 词：电流互感器 金属膨胀器 爆破片 密封失效 

分 类 号：TM452[电气工程—电器]