电流互感器末屏断裂缺陷及其影响分析  

Analysis of Current Transformer End Shield Breakage Defect and Its Influence

作　　者：李文燕 刘江明 张翾喆 艾云飞 周杰 刘昌标 谢斯晗 LI Wenyan;LIU Jiangming;ZHANG Xuanzhe;AI Yunfei;ZHOU Jie;LIU Changbiao;XIE Sihan(State Grid Zhejiang Electric Power Corporation Maintenance Branch,Hangzhou 311232,China)

机构地区：[1]国网浙江省电力有限公司检修分公司,杭州311232

出　　处：《电力电容器与无功补偿》2020年第5期95-98,103,共5页Power Capacitor & Reactive Power Compensation

摘　　要：电流互感器是电力系统中重要的电力设备,运行过程中易发生绝缘故障。针对一起电容型电流互感器电容量偏小异常案例,通过试验、解体分析查明了异常原因为末屏存在断裂缺陷。根据绝缘结构设计原理建立等效电路模型,结合试验情况计算了异常设备末屏断裂产生的悬浮电位差,总结了末屏断裂位置对悬浮电位差的影响,并指出了针对该类缺陷的有效检测方法,对电容型电流互感器电容量异常的分析和处置起到了一定借鉴作用。Current transformer is important electrical equipment in power systemsand is prone to insulation failure during operation.In view of small and abnormal capacitance of capacitive current transformer,it is checked throughout test,disassembly analysis that the abnormal reason is due to breakage defect at the end shield.The equivalent circuit model is set up based on the principle of insulation structure design and the suspension potential difference caused by the end shield breakage of the abnormal equipment is calculated in accordance with test situation,the influence of the end shield breakage position on the suspension potential is summarized and the effective detection method for such defect is pointed out,which has a definite reference in the analysis and treatment of the abnormal capacitance of the capacitive current transformer.

关 键 词：电容型电流互感器 电容量 末屏 异常 

分 类 号：TM452[电气工程—电器]