一起35kV变压器差动保护误动作原因分析与改进建议  

Cause Analysis and Improvement Suggestions of Misoperation of a 35kV Transformer Differential Protection

作　　者：张时敏 夏超 孙东杰 汤大海 ZHANG Shimin;XIA Chao;SUN Dongjie;TANG Dahai(Zhenjiang Power Supply Branch of State Grid Jiangsu Electric Power CoLtd.,Zhenjiang 212001,China)

机构地区：[1]国网江苏省电力有限公司镇江供电分公司,江苏镇江212001

出　　处：《电气开关》2023年第4期91-94,共4页Electric Switchgear

摘　　要：本文阐述一起某35kV变电站2号变压器差动保护在低压侧发生区外故障时出现了误动作跳闸事故。通过分析故障录波图和短路故障计算,找到了该差动保护误动作跳闸原因,并提出了相应的改进建议,使得该地区差动保护的运行状态得到改善,至今未出现同类型误动作。This paper expounds a misoperation tripping accident of differential protection of No2 Transformer in a 35KV substation when an out of zone fault occurs at the low voltage sideBy analyzing the fault oscillogram and shortcircuit fault calculation,the causes of misoperation and tripping of the differential protection are found,and the corresponding improvement suggestions are put forward,so that the operation state of the differential protection in this area is improved,and there is no misoperation of the same type so far.

关 键 词：差动保护 误动作 TA绕组故障 移相原理 改进建议 

分 类 号：TM40[电气工程—电器]