中性点不接地配电网电容电流实时测量新方法  

A Novel Measuring Method of Capacitive Current for Insulated Neutral Distribution Networks

作　　者：曾祥君[1] 许瑶[1] 陈博 张平[1] 袁超[1] 

机构地区：[1]长沙理工大学电气与信息工程学院,湖南省长沙市410076 [2]山东省电力工程咨询院,山东省济南市250013

出　　处：《电力系统自动化》2009年第2期78-81,91,共5页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50577001);湖南省自然科学基金资助项目(07JJ3110)~~

摘　　要：提出了一种实时测量中性点不接地配电网电容电流的新方法——单频率测量法,即从电压互感器开口三角侧注入一个恒定的电流信号,测量开口三角侧电压和二次星形侧相电压。根据注入的电流信号和测出的电压信号,计算出配电网对地电容值和电容电流值。该方法完全避免了电压互感器短路阻抗和注入信号频率选取组合对测量结果的影响。经理论推导和模拟实验验证,该方法不影响配电网正常运行,具有安全、简捷、准确等优点。A novel method of capacitive current measurement （injecting one frequency signal measurement） is proposed for insulated neutral distribution networks. With a constant current signal injected into the open-delta side of the voltage transformer, the voltage of the open-delta side and the phase voltage of the secondary star side are measured. The distribution network capacitance and capacitive current to ground can be calculated in accordance with the injected current signal and the measured voltage signals. The proposed method avoids the influence of short-circuit impedance of the voltage transformer and the injecting signal frequencies. The results of dynamic power system simulation show that the proposed method is with high precision, and can be used in real-time without power supply interrupting.

关 键 词：配电网 电容电流 对地电容 电压互感器 

分 类 号：TM86[电气工程—高电压与绝缘技术]