一起小电阻接地系统主变保护越级跳闸事故的分析  

Analysis of Over-Class Trip Accident of Main Transformer Protection Small Resistance Grounding System

作　　者：胡亦涵 王策 钱碧甫 王佳兴 Hu Yi-han;Wang Ce;Qian Bi-fu;Wang Jia-xing(Wenzhou Power Supply Company,Wenzhou,Zhejiang 325000)

机构地区：[1]温州供电公司

出　　处：《电气防爆》2019年第5期43-46,共4页Electric Explosion Protection

摘　　要：通过一起110 kV变电站20 kV小电阻接地系统发生主变低压侧保护动作跳闸的事故,利用保护动作情况和故障录波波形进行事故分析,并提出相应预控措施。It studied through an accident of protection action trip at low voltage side of main transformer in 20kV small resistance grounding system of 110kV substation,the protection action and fault recording waveform are used for accident analysis,and corresponding pre control measures are put forward.

关 键 词：小电阻接地 外接零序 零序过流保护 零序电流互感器 

分 类 号：TM77[电气工程—电力系统及自动化]