电力电缆局部放电信号识别与去噪研究

Research on Partial Discharge Signal Identification and Denoising of Power Cables

通过试验分析局放放电信号,并利用小波变换局部放电信号预处理与后处理平台,对低频子信号实施四阶PDE迭代去噪,将效果评价指数信噪比(SNR)当做去噪过程当中迭代的相应终止条件。结果表明,本研究可以有效保留信号边缘和有关细节,比小波阀值去噪有更加明显的去噪性能。

This paper analyzes the partial discharge signal with test and detection data,and uses the efficient partial discharge signal pre-processing and post-processing platform given by wavelet transform to implement fourth-order PDE iterative denoising for low-frequency sub-signals.In addition,the effect evaluation index signal-to-noise ratio(SNR)is used as the corresponding termination condition for the iteration in the denoising process.During the research,this paper can effectively preserve the signal edges and related details.Compared with the previous wavelet threshold denoising,it has more obvious denoising performance.