110 kV变电站主变差动保护动作跳闸事件的分析  

Analysis of 110kV Substation Main Transformer Differential Protection Trip Event

作　　者：顾清 黄强 GU Qing;HUANG Qiang(Yangzhou power supply branch of State Grid Jiangsu Electric Power Co.,Ltd.,Yangzhou,Jiangsu 225000,China)

机构地区：[1]国网江苏省电力有限公司扬州供电分公司,江苏扬州225000

出　　处：《自动化应用》2023年第19期161-163,169,共4页Automation Application

摘　　要：本文介绍某110 kV主变在短期内相继发生的两起主变差动保护跳闸事件,根据两次跳闸后的保护装置告警信息、对故障录波器的波形分析和对一次设备的拆解检查,分析两次跳闸的原因分别为用户端故障导致的电压波动和电缆桩头的工艺缺陷;最后针对变电运维中可能出现的各种跳闸故障给出了排查的方向和建议。this paper introduces two differential protection tripping events of a 110 kV main transformer in a short period of time,according to the warning information of the protection device after two trips,the waveform analysis of the fault recorder and the disassembly inspection of the primary equipment,the causes of the two trips are voltage fluctuation caused by the user end fault and the technical defects of the cable pile head.Finally,the direction and suggestions for the check of all kinds of tripping faults that may occur in the operation and maintenance of substation are given.

关 键 词：变压器 差动保护 小电流接地系统 

分 类 号：TM407[电气工程—电器]