配电网有功泄漏电流实时测量方法  

A method of real time measurement for active leakage current in distribution network

作　　者：刘宗杰[1] 赵锐[1] 刘玉玲 王祥哲[1] 杨磊[2] 曾祥君 LIU Zong-jie;ZHAO Rui;LIU Yu-ling;WANG Xiang-zhe;YANG Lei;ZENG Xiang-jun(State Grid Shandong Province Jining Power Supply Company fining 273500,China;Hunan Province Key Laboratory of Smart Grids Operation and Control,Changsha University of Science and Technology,Changsha 410114, China)

机构地区：[1]国家电网山东省济宁供电公司,山东济宁273500 [2]长沙理工大学智能电网运行与控制湖南省重点实验室,湖南长沙410114

出　　处：《电力科学与技术学报》2019年第2期28-32,共5页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金(51425701);国家重点研究发展计划(2016YFB0900605);国网山东省电力公司科技项目(SGTYHT/15-JS-191)

摘　　要：在考虑中性点经消弧线圈串联阻尼电阻接地的基础上,提出一种谐振接地配电网有功泄漏电流实时测量的方法,通过配电网零序电压互感器向配电网注入非工频的特定频率电流信号,在消弧线圈内部电压互感器测量返回的电压信号,经计算得出配电网有功泄漏电流。仿真结果表明该测量方法测量精度较高,可消除电压互感器内阻抗及加装阻尼电阻的影响,测量过程安全简便。Considering the feature of neutral point grounded through the arc suppression coil series damping resistor,a method of real-time measurement for the active leakage current in the distribut on network is proposed in this paper.A specific frequency current signal is injected into the distribution network via the zero-sequence voltage transformer while the returned voltage signal is measured by the internal voltage transformer of arc suppression coil.Then,the active leakage current of distribution network can be calculated.Finally, a simulation is included for verification.It is shown that the proposed method has high measurement accuracy.It not only eliminates the influence of damping resistor and also the internal resistance of voltage transformer.Besides, the measurement process is safe and easy.

关 键 词：配电网 阻尼电阻 电压互感器 有功泄漏电流测量 

分 类 号：TM934[电气工程—电力电子与电力传动]