杂散电容对电容式电压互感器测量误差的影响  

Influence of stray capacitance on the measurement errors of capacitor voltage transformer

作　　者：谢伟伦 许家凤 黄志威 徐卫东 XIE Weilun;XU Jiafeng;HUANG Zhiwei;XU Weidong(Dongguan Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Dongguan Guangdong,523008,China)

机构地区：[1]广东电网有限责任公司东莞供电局,广东东莞523008

出　　处：《宁夏电力》2018年第3期9-13,共5页Ningxia Electric Power

基　　金：中国南方电网有限责任公司科技项目(GDKJXM20162094)

摘　　要：电容式电压互感器(capacitor voltage transformer,CVT)测量谐波的精度受补偿电抗器杂散电容的影响较大。通过对补偿电抗器杂散电容物理特性的分析,建立等效电路模型,以及对CVT谐波传递特性的分析计算,利用MATLAB/Simulink仿真软件,研究了杂散电容在不同范围内波动时对CVT各次谐波的传变误差的影响。仿真结果表明:不同杂散电容在相同范围内波动时,数值越大的杂散电容对CVT的传递特性影响越大。The accuracy of the harmonics measured by a capacitor voltage transformer （CVT） is greatly affected by the stray capacitance of the compensating reactor. By analyzing the physical characteristics of the stray capacitance of the compensation reactor, an equivalent circuit model is established, and the harmonic transmission characteristics of the CVT are analyzed and calculated. Using the MATLAB/Simulink simulation method, the influence of transmission eiTors of various harmonics for CVT caused by the fluctuation of the stray capacitance in different ranges are researched. The simulation results show that when the magnitude of different stray capacitance fluctuates within the same range, the larger the stray capacitance, the greater the influence on the transfer characteristics of CVT. The simulation results have gloat application value to the research of CVT harmonic measurement and correction technology.

关 键 词：补偿电抗器 杂散电容 高频等效电路模型 传递特性 传变误差 

分 类 号：TM45[电气工程—电器]