抑制局部放电在线监测中周期性干扰的级联式IIR陷波滤波器的研究

The Study of Cascade IIR Notch Wave Filter to Reject Periodic Interference in Partial Discharge Measurement on Line

在分析用IIR陷波滤波器来抑制局部放电在线监测中周期性干扰的基础上 ,提出和论述了级联式IIR陷波滤波器基本原理及简明设计方法。模拟仿真和现场实验证明这种滤波器能有效的抑制局部放电在线监测系统中的周期性干扰。对于采样频率低的窄带系统 ,采用该滤波方法能在滤波同时 ,得到一个周波里的放电波形。

We analyze rejecting periodic interference in PD monitoring on line through cascade IIR digital wave notch filter. The principle and simple design method are proposed and discussed.Experiment results are given.The results prove the method effective for rejecting periodic interference in PD monitoring on line.For lower sampling frequency monitoring system,the discharge waveform can be gotten by the filter method.