变电站直流系统典型接地故障分析与预防策略

Analysis and Prevention Strategy of Typical Grounding Faults in Substation Direct Current System

站用直流系统是变电站的重要组成部分,为继电保护装置、安全自动装置等设备提供稳定的直流电源。但变电站内直流系统易发生直流接地故障,影响设备供电,危害电力系统安全运行。分析运行中变电站和在建变电站发生的典型直流系统接地故障,找出故障出现、发展过程中的症结并提出相应的预防措施,以降低直流接地故障发生的概率,保证直流系统可靠运行。

Station direct current system is an important part of substation,which provides stable direct current power supply for relay protection devices,safety automatic devices and other equipment.However,the direct current system in substation is prone to direct current grounding fault,which affects the power supply of equipment and endangers the safe operation of power system.This paper analyzes the typical grounding faults of direct current system in operating substations and substations under construction,finds out the crux of the faults and puts forward corresponding preventive measures to reduce the probability of direct current grounding faults and ensure the reliable operation of direct current system.