电子式互感器相位补偿方法的研究和比较

电子式互感器的相位误差是影响互感器测量精度的重要因素,可以采用相位补偿方法对其加以校正。文章给出了电子式互感器的设计原理,分析了电子式互感器相位误差产生的原因,介绍了全通滤波器、短数据窗移相算法、傅里叶移相算法等相位补偿方法,研究了谐波对上述补偿方法的影响,在此基础上提出了改进的相位补偿方法:移点法和线性相位全通滤波法,并进行了实验测试。实验结果表明,互感器的角差满足0.2级测量精度要求,改进的相位补偿方法具有可行性。

Research and Comparison on Phase Compensation Schemes for Electronic Transformer

The phase error of electronic transformer is an important factor which influences the measurement accuracy. However,the phase error can be modified through proper phase compensation scheme. This paper introduces the principle of the electronic transformer and analyses the causes of phase error. The phase compensation schemes, such as all-pass filter, phase-shifted algorithm of short data window, phase-shifted algorithm of Fourier are introduced. The influence of the harmonic is also researched. On this basis, the paper puts forward the improved schemes of phase compensation: sampling points removed and the linear phase of all-pass filter. The experiment shows that the phase error of transformer can meet the class 0.2 accuracy requirements and with feasibility.