一起直流接地引起跳闸事故的分析与处理  

Fault Analysis and Treatment of a Tripping Operation Caused by DC Grounding

作　　者：陈兵 蔡清亮 邵燕秋 CHEN Bing;CAI Qingliang;SHAO Yanqiu(State Grid Shandong Electric Power Company,Ultra High Voltage Company,Jinan 250118,China)

机构地区：[1]国网山东省电力公司超高压公司,山东济南250118

出　　处：《电工技术》2025年第5期154-155,158,共3页Electric Engineering

摘　　要：介绍了某500kV变电站220kV侧系统母联断路器运行时三相出口压板直流接地导致开关单相跳闸,首先分析了保护动作过程,然后对异常动作情况进行分析,并通过对出口继电器动作时间及动作电压进行模拟试验,进一步剖析了仅单相跳闸的原因,提出了防止误碰的改进措施,最终实现电网安全稳定运行。This paper introduces the case of single-phase trip of the bus tie circuit breaker on 220 kV side of 500 kV substation due to DC grounding of the three-phase outlet pressure plate during operation.Firstly,the protection action process and the abnormal action is analyzed.And,through the operation time and action voltage of the exit relay are simulated,the causes of single-phase trip are further analyzed,and the improvement measures to prevent accidental touch are put forward,so as to realize the safe and stable operation of the power grid.

关 键 词：母联断路器 三相出口压板 直流接地 单相跳闸 模拟试验 

分 类 号：TM77[电气工程—电力系统及自动化]