基于故障录波的直流系统瞬时接地监测系统研究  

Research on instantaneous grounding monitoring system of DC system based on fault recording

作　　者：全杰雄 温才权[1] 黄永丰[1] 刘英男 于大洋[2] QUAN Jiexiong;WEN Caiquan;HUANG Yongfeng;LIU Yingnan;YU Dayang(Wuzhou Bureau of China Southern Power Grid EHV Transmission Company,Wuzhou 543002,China;School of Eletrical Engineering,Shandong University,Jinan 250061,China)

机构地区：[1]中国南方电网有限责任公司超高压输电公司梧州局,广西梧州543002 [2]山东大学电气工程学院,山东济南250061

出　　处：《电子设计工程》2022年第17期100-103,108,共5页Electronic Design Engineering

基　　金：中国南方电网科技项目资助(CGYKJXM20180555)。

摘　　要：针对变电站直流系统瞬时接地故障不易查找的问题,设计了一种基于故障录波的直流系统瞬时接地监测系统,基于故障前后的瞬时波形及其波形特征,判断系统瞬时接地故障。实验室内搭建模型电路,提取瞬时接地故障特征量直流母线对地电压和支路漏电流,通过支路漏电流的方向变化区分瞬时接地和投入电容性负荷,通过监测馈线上漏电流的突变情况,实现馈线的瞬时接地故障定位,通过实验室测试验证了该系统的有效性。Aiming at the problem that it is difficult to find the instantaneous grounding fault of DC system in substation,a monitoring system of instantaneous grounding fault of DC system based on fault recording is designed.Based on the instantaneous waveform before and after the fault and its characteristics,the instantaneous grounding fault of the system is judged.A model circuit is built in the laboratory to extract the characteristic parameters of instantaneous grounding fault,namely,DC bus voltage to ground and branch leakage current.The direction change of branch leakage current is used to confirm whether the instantaneous grounding fault occurs.By monitoring the sudden change of leakage current on the feeder,the instantaneous grounding fault location of the feeder is realized.The effectiveness of the system is verified by laboratory tests.

关 键 词：直流系统 故障录波 瞬时接地 绝缘监测 

分 类 号：TP23[自动化与计算机技术—检测技术与自动化装置]