基于小波滤波和跟踪微分器的介质损耗因数检测方法

A Method to Detect Dielectric Loss Factor Based on Wavelet Filtering and Tracking Differentiator

提出了一种新的介质损耗因数检测方法,将电压与电流信号经过小波滤波得到基波分量,利用跟踪微分器求得电压的一阶微分信号,再根据电压信号、电流信号和电压一阶微分信号计算介质损耗因数。仿真结果表明:该算法物理意义明确、计算简单、测量结果精确,可用于介质损耗因数的离线测量与在线监测。

In this paper a new method to detect dielectric loss factor is given, which applies wavelet filtering to voltage and current signals to obtain their fundamental components, then tracking differentiator is used to attain first-order differential of voltage signal, finally, according to voltage signal, current signal and first-order differential of voltage signal the dielectric loss factor can be calculated. Simulation results show that the proposed algorithm possesses determinate physical meaning, the calculation is simple accurate, so this method can be used in both on-line monitoring and off-line measurement of dielectric loss factor.