一种谐振接地系统电容电流测量新方法  

A new capacitor current measurement method for resonance grounding system

作　　者：张姗 梁志瑞[1] 张丽芳 李梁 杜鹏宇 ZHANG Shan;LIANG Zhirui;ZHANG Lifang;LI Liang;DU Pengyu(School of Electrical Electronic Engineering,North China Electric Power Universty,Baoding 071003,China;State Grid Shijiazhuang Electric Power Supply Company,Shijiazhuang050000,China)

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071003 [2]国网石家庄供电公司,河北石家庄050000

出　　处：《电力科学与技术学报》2020年第1期109-114,共6页Journal of Electric Power Science And Technology

基　　金：国家重点研发计划(2017YFB0902900)。

摘　　要：系统电容电流的精确测量是谐振接地系统中消弧线圈正确调谐的前提和关键。通过分析现有配电网电容电流测量方法中存在的问题,提出一种测量电容电流的新方法。该方法通过改变消弧线圈电感值的大小,测量电感值改变前后,系统中性点位移电压和中性点电流的幅值和相位,并根据公式计算系统对地总电容及对地总电导,进而计算出系统对地额定电容电流值。最后通过MATLAB仿真验证该方法能够取得较高的测量精度。该方法操作方便,计算简单,可用于消弧线圈的调谐计算。The accurate measurement of system capacitance current is the precondition and key factor for the correet tuning of the arc suppression coil in the resonance grounding system.On the basis of analyzing the existing problems in the capacitor current measurement method of distribution network,a new method for capacitor current mea sure-ment is proposed.By changing the inductance value of the arc suppression coil,the amplitude and phase of the neutral point displacement voltage and neutral point current of the system are measured before and after changing the induct ance value.According to the formula,the total capacitance and conductance of the system are calculated.And then the rated capacitor current of the system is calculated.Finally,the MATLAB simulation proves that the method can achieve high measurement accuracy.The method is easy to operate and simple to calculate,and it can be used for the tuning calculation of arc suppression coil.

关 键 词：谐振接地系统 消弧线圈 中性点位移电压 中性点电流 对地额定电容电流 

分 类 号：TM76[电气工程—电力系统及自动化]