多频率同步的电流互感器H_(n-ave)估计方法

针对电流互感器频率响应特性传统测试方法存在的工作量大、测试周期长的不足,提出一种多频率同步的电流互感器H_(n-ave)估计方法。该方法以多频率同步信号作为激励源,采用移位相关法减小相关函数波形衰减。在不增加样本长度的基础上通过增加互功率谱计算结果的数量,抑制输入输出通道中零均值高斯白噪声对频率响应函数估计结果的影响,实现电流互感器的频率响应函数的准确估计。仿真和实际测量实验结果验证了该测量方法的有效性和可行性。

Hn-ave Frequency Response Estimation of Current Transformer with Synchronized Multi-Frequency Signal

In the estimation of frequency response characteristic of current transformer,the traditional methods require either heavy workload or a long test time.This paper proposed a Hn frequency response estimation of current transformer with synchronized multi-frequency signal.The proposed method used a multi-frequency synchronized signal as the input.And it applied the shift correlation method to reduce the attenuation of the correlation function waveform.An average of cross-correlation power spectrum was adopted to suppress the influence of the white Gaussian noise from input and output signals on frequency response estimation.The proposed method can accurately estimate the frequency response of the current transformer.Simulation and practical test results have verified the usefulness of the proposed method.