电流互感器特性不一致引起差动保护误动作的分析及试验  

Analysis and Test of Differential Protection Misoperation Caused by Inconformity of Current Transformer Magnetization

作　　者：史峰 SHI Feng(The Energy Center of Jiuquan Iron and Steel Group,Jiayuguan,Gansu 735100,China)

机构地区：[1]酒钢集团能源中心

出　　处：《冶金动力》2019年第11期16-19,共4页Metallurgical Power

摘　　要：线路甲A相发生区内接地故障,线路乙、丙属区外故障,但线路乙、丙C相同时出现尖波电流,导致差动保护误动作,为进一步查明线路乙、丙差动保护误动作的具体原因,对线路乙、丙的一、二次设备进行检查、试验及故障录波波形分析,经理论分析及试验验证得出此次差动保护误动作是由于电流互感器励磁特性较差引起。The phase A of line 1 had an internal grounding fault while line 2 and line 3 had external faults,but sharp wave current appeared when line 2 and line 3C were the same,which caused differential protection misoperaiton.To found out the specific rea?sons for the differential protection misoperaiton of line 2 and line 3,the primary and sec?ondary equipment of the two lines were inspected and tested and fault wave form records were analyzed.Through theoretic analysis and tests it was determined that the differential protection misoperaiton was caused by poor magnetization characteristics of the current trans?former.

关 键 词：差动保护 误动作 电流互感器 励磁特性 

分 类 号：TM45[电气工程—电器]