电容式电压互感器谐波测量误差研究

摘要

依据电容式电压互感器(CVT)的结构和工作原理,建立了采用谐振型和速饱和型阻尼器的CVT谐波等效电路,给出了等效电路中元件参数的计算方法;通过对等效电路的分析,研究了CVT固有的多种谐振模式,给出了谐振频率的计算方法,得到CVT谐波测量误差的来源;对比分析了不同类型阻尼器对CVT测量误差的影响;仿真和物理实验验证了所得结论的正确性和有效性,为进一步量化分析CVT的谐波测量误差提供了理论依据.%The harmonic equivalent circuit of CVT(Capacitive Voltage Transformer) with resonance-type damper and that of CVT with instant-saturation-type damper are established according to the structure and working principle of CVT and the methods for calculating the component parameters of circuits are presented.The equivalent circuits are analyzed,several inherent resonance modes of CVT are studied,the method for calculating the resonance frequencies is given,and the causes of CVT harmonic measurement error are found.The influence of damper on the error is analyzed and compared between different damper types and the results of simulation and physical experiment show the correctness and effectiveness of the obtained conclusions,which provides the theoretical basis for the further quantitative analysis of CVT harmonic measurement error.