变电站直流系统接地故障的危害及处理

Hazards and Treatment Methods of Ground Faults in Substation DC Systems

变电站直流系统为站内控制、信号、继电保护、自动装置和事故照明等提供了可靠的直流电源,是变电站不可或缺的重要组成部分。直流系统容易发生直流接地故障,对继电保护等装置产生不利影响。介绍了变电站直流系统的组成、工作原理及运行状态,归纳了直流系统接地故障的原因和分类,分析了直流系统接地故障的现象及危害,并总结了直流接地故障的处理方法,为变电运维工作提供了有效的技术支撑。

The DC system of the substation provides reliable DC power for internal control,signaling,relay protection,automatic devices,and accident lighting,making it an indispensable and important part of the substation.DC systems are prone to DC ground faults,which adversely affect relay protection and other devices.This paper introduces the composition,working principle,and operating state of the DC system in substations,summarizes the causes and classification of DC system ground faults,analyzes the phenomena and hazards of DC system ground faults,and summarizes the treatment methods for ground faults,providing effective technical support for substation operation and maintenance work.