一起线路故障导致母差保护误动事故分析  

Analysis of a Bus Differential Protection Malfunction Caused by a Line Fault

作　　者：林力 程玉凯 LIN Li;CHENG Yukai(SDIC Genting Meizhouwan Electric Power Co.,Ltd.,Putian 351100,China;Zhangzhou Power Supply Company of State Grid Fujian Electric Power Co.,Ltd.,Zhangzhou 363000,China)

机构地区：[1]国投云顶湄洲湾电力有限公司,福建莆田351100 [2]国网福建电力有限公司漳州供电公司,福建漳州363000

出　　处：《安徽电气工程职业技术学院学报》2023年第1期1-9,共9页Journal of Anhui Electrical Engineering Professional Technique College

摘　　要：针对一起线路故障造成母差保护误动作的事故,通过现场情况检查,确定了CT绕组短接片未拆除导致的CT变比变化是造成母差保护误动作的主因。利用一次通流试验获得CT实际变比后,通过带入实际运行数据,给出了CT变比变化对各保护动作的影响,最后针对本次事故提出了相应的改进措施。Through the on-site inspection of a bus differential protection malfunction due to a line fault,it is determined that the main cause was failure to remove the CT winding shorting piece,which led to change of the CT transformation ratio.After obtaining the actual CT transformation ratio with a flow test,the influence of CT transformation ratio change on each protection action is given by bringing in the actual operation data.Finally,the corresponding improvement measures are proposed for this accident.

关 键 词：误动作 短接片 CT变比 母差保护 

分 类 号：TM452[电气工程—电器]