变电站直流系统接地故障准确定位方法研究  

Research on Accurate Grounding Fault Location Method in Substation DC System

作　　者：马小军 邵永浩 MA Xiaojun;SHAO Yonghao(Ultra-High Voltage Company,State Grid Ningxia Electric Power Co.,Ltd.,Yinchuan 750011,China)

机构地区：[1]国网宁夏电力有限公司超高压公司,宁夏银川750011

出　　处：《电工技术》2023年第14期228-231,共4页Electric Engineering

摘　　要：针对变电站(发电厂)现有直流系统绝缘监测装置测量误差大,容易出现误报和漏报现象,以及存在不能准确定位直流接地故障点的缺点,以基尔霍夫定律和霍尔效应为基础,对直流接地故障的电流特点进行理论分析和推导,通过优化算法,并在直流系统支路上增加电流传感器,实现接地故障点的准确定位。该方法能有效提高故障处理效率,降低直流系统接地造成的保护误动、拒动风险。The existing DC system insulation monitoring device in substation(power plant)has a large measurement error,which is prone to false alarms and false alarms,and there are shortcomings that cannot accurately locate DC ground fault points.In order to solve this problem,based on Kirchhoff's law and Hall effect,the current characteristics of DC ground fault are theoretically analyzed and derived.By optimizing the algorithm and adding a current sensor to the DC system branch,the accurate location of the ground fault point is realized.This method can effectively improve the fault handling efficiency and reduce the risk of protection misoperation and rejection caused by DC system grounding.

关 键 词：直流系统 接地 定位 

分 类 号：TM07[电气工程—电工理论与新技术]