一起交流110 kV变电站直流接地故障分析与处理

Analysis and Treatment of a DC Grounding Fault in 110 kV AC Substation

直流接地故障易扩大事故范围,威胁电网的稳定运行。本文对一起典型的变电站直流接地故障进行排查与分析,该故障因防雷元件的选型不当造成变电站发生直流接地,绝缘监察装置发出告警信号,检修人员现场按照缺陷处理的步骤进行查找并消除故障点,分析了本次故障查找的过程及方法,总结了直流接地故障的排查要点,对故障发生的原因进行反思,提出对策,并对相关变电站进行整改。

DC grounding fault easily expands the scope of the accident and threatens the stable operation of the power grid.This paper investigates and analyzes a typical DC grounding fault in a substation.Due to improper selection of lightning protection components,this fault causes DC grounding in the substation.The insulation monitoring device sends an alarm signal.The maintenance personnel find and eliminate the fault point according to the defect handling steps on site.Analyzes the process and method of fault finding,summarizes the key points of DC grounding fault troubleshooting,and reflects on the cause of the fault,and proposes countermeasures to rectify relevant substations.