变压器差动保护误跳闸故障原因排查  

Cause Analysis of Differential Relaying False Tripping of Transformer

作　　者：乔斌强 王永胜[1] 刘斌[1] 刘冰 张祥[1] QIAO Binqiang;WANG Yongsheng;LIU Bin;LIU Bing;ZHANG Xiang(Wulanqab Electric Power Bureau, Wulanqab 012000, China)

机构地区：[1]乌兰察布电业局

出　　处：《内蒙古电力技术》2019年第5期98-100,共3页Inner Mongolia Electric Power

摘　　要：针对某110kV变压器低压侧差动保护误跳闸,通过故障信息分析初步认为故障原因为变压器高压侧TA二次回路W相存在电流泄漏;利用故障模拟及加压法确定了故障点,以及TA接线破皮是导致主变压器误跳闸的主要原因;并提出相应建议,以防止该类事故再次发生。Through analysis on false tripping of 110 kV transformer's differential protection, the reason of fault is the leakage of the secondary current of TA on phase W at high side of transformer. The fault position is determined by applying voltage method and fault simulation. The cause of malfunction of main transformer is the insulation damage of TA secondary circuit. The proposal is offered and the failure is prevented from happening.

关 键 词：变压器 差动保护 TA 误跳闸 加压法 故障模拟 

分 类 号：TM411[电气工程—电器]