配电网单相接地故障脉冲电流测距  

Pulse current fault location for single-phase grounding of distribution network

作　　者：刘小江 陈坤燚 肖先勇[2] 范松海 Liu Xiaojiang;Chen Kunyi;Xiao Xianyong;Fan Songhai(Electric Power Research Institute of State Grid Sichuan Electric Power Company,Chengdu 610072,China;Sichuan University,Chengdu 610065,China)

机构地区：[1]国网四川省电力公司电力科学研究院,成都610072 [2]四川大学,成都610065

出　　处：《电测与仪表》2018年第19期13-19,共7页Electrical Measurement & Instrumentation

基　　金：四川省科技攻关项目(2017JY0032);国网四川省电力公司科技资助项目(521997160026);国家电网公司科技资助项目(国家电网科[2017]179号文第169号项目)

摘　　要：针对配网单相接地故障电流较小,测距困难的问题,提出了一种脉冲电流测距方法。该方法通过短时改变中性点接地方式,在故障线路上产生幅值较大的脉冲电流。合理选择连接于中性点的限流电阻,将暂态过程控制在脉冲电流前半段,采用后半段数据计算脉冲电流稳态特征。利用脉冲电流稳态特征与故障距离之间的关系,实现了脉冲电流故障测距。该方法用于测距的脉冲电流幅值较大,可有效解决单相接地故障测距问题。通过MATLAB/Simulink仿真表明该方法具有较高的精度且受接地电阻影响较小。A fault location method based on pulse current is presented,this method aims at dealing with the problem that the position of fault cannot be calculated accurately because the amplitude of single-phase grounding fault current is very smaller.A large amplitude pulse current is produced in fault line through changing the neutral grounding model in a short time.The transient process of pulse current can be controlled in the range of first half through selecting the current limiting resistance reasonably,and the second half of pulse current can be used to calculate the steady character of pulse current.The fault location method can be implemented according to the relations between the steady character of pulse current and the fault position.The MATLAB/Simulink simulation results show that the presented fault location method has a high precision and little effect by ground resistance.

关 键 词：故障测距 脉冲电流测距 消弧线圈 中性点非有效接地系统 

分 类 号：TM771[电气工程—电力系统及自动化]