摘要
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。
The phase error of electronic transformer is an important factor which will affect the measurementaccuracy. However, the phase error can be modified through a proper phase compensation scheme. The principle ofthe electronic transformer has been given out and the causes of phase error have been analyzed. The phasecompensation schemes, including all-pass filter, phase-shifted algorithm of short data window, and phase-shiftedalgorithm of Fourier, have been introduced. The influence of the harmonic on above schemes has also beenresearched. On this basis, an improved schemes of phase compensation is presented, , namely sampling pointsremoved and the linear phase of all-pass filter scheme. The experimental results show that the phase error oftransformer can meet the class 0.2 accuracy requirements so as to verify the feasibility.
出处
《电测与仪表》
北大核心
2014年第12期7-11,28,共6页
Electrical Measurement & Instrumentation
基金
国家自然科学基金资助项目(51077058
51277080)
江苏省电力公司科技项目(J2012035)
关键词
电子式互感器
相位误差
测量精度
相位补偿
谐波
electronic transformer, phase error, measurement accuracy, phase compensation, harmonic
