现场局部放电信号中周期性窄带干扰的抑制

Rejection for Periodical Narrow-band Noises of On-site PD Monitoring Signals

电力变压器局部放电监测信号分析过程中 ,抑制周期性窄带干扰的方法主要有自适应滤波器、FFT频域滤波、小波降噪以及基于 Remez算法的高能数字滤波器等。对比这些方法处理的结果 ,可知 Remez算法具有最佳抗干扰效果和最高的信噪比。

During the analysis of partial discharge (PD) monitoring signals of power transformer, rejection methods for periodical narrow-band noises use mainly adaptive filters, FFT frequency-domain filtering, wavelet denoising and high-pass digltal filter based on Remez algorithm. Results of different rejection methods for on-site PD signals have indicated that Remez algorithm had optimum rejection effects and best signal-to-noise ratio.