电磁式电压互感器频域测量误差分析

Analysis on measurement error of electromagnetic voltage transformer in frequency domain

文中介绍了电磁式电压互感器（TV）的谐波等效模型,并对该模型进行了简化分析,在简化电路的基础上分析了TV比差及角差产生的原因。利用仿真软件对TV建立相应的模型,计算在基波及2~50次谐波下的比差及角差,并改变模型的参数计算参数变化时对TV测量误差产生的影响。设计了物理试验平台,并通过试验验证了理论分析及仿真的正确性。仿真及试验结果表明,电压频率较低时TV可以进行准确的测量,当频率较高时,TV的测量误差变大,比差及角差均不满足测量准确性的要求。

The harmonic equivalent model of electromagnetic voltage transformer（ TV） is introduced in this paper,as well as the simplified analysis for this model. Meanwhile,the causes of ratio error and angle error of TV are analyzed on the basis of the simplified circuit. The simulation model is established based on its equivalent circuit to calculate its ratio error and angle error under 2 ~ 50 harmonics through the simulation calculation,and change its parameter to explore the influence on measurement error when parameter changes. The physical test platform is designed,and the correctness of theoretical analysis and simulation experiment are verified by physical test. Results of simulation and physical test show that the harmonic measurement error will increase when measuring the harmonic with higher frequency,and the ratio error and angle error cannot meet the accuracy requirements.