配电网单相接地故障对计量回路影响的分析研究  

Analysis and research on the influence of single-phase earth fault on metering loop in distribution network

作　　者：庞渝基 江波[2] 罗睿希[2] Pang Yuji;Jiang Bo;Luo Ruixi(State Key Laboratory of Power Transmission Equipment & System Security and New Technology,Chongqing University,Chongqing 400044,China;Measurement Center of Sichuan Electric Power Company,Chengdu 610072,China)

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044 [2]国网四川省电力公司计量中心,成都610072

出　　处：《电测与仪表》2019年第16期67-72,共6页Electrical Measurement & Instrumentation

基　　金：国家电网总部科技项目(52199916024P)

摘　　要：我国配电网中性点不接地系统出现单相接地故障时,允许系统可以带电运行两小时及以上。文章针对以上现状,补足之前关注上的缺失,专门研究了该情况对配电网负荷侧和电源侧电能计量回路的影响。推导了电能计量装置分别装设在负荷侧和电源侧时,发生单相接地故障后电能计量回路的数学物理模型,以及发生单相接地故障前后配电线路有功损耗变化的表达式,并通过仿真试验验证,得出了发生单相接地故障对负荷侧电能计量回路无影响但对电源侧电能计量回路有影响的结论。The isolated neutral distribution power system in China is permitted to continue operating for two hours after single-phase earth fault.This paper researched the influence of distribution network electric energy metering loop technically in such case to make up the lack of attention before.This paper inferred the mathematical physical model of electricity metering loop and expressions of active power line loss under single-phase earth fault.Models and expressions were verified by simulation.It is concluded that electric energy metering loop on the load side is effected by the single phase earth fault while the one on power supply side is not affected.

关 键 词：单相接地故障 电能计量回路 中性点不接地系统 

分 类 号：TM773[电气工程—电力系统及自动化]