氧化锌避雷器在线监测泄漏电流信号去噪研究

Research on the On-line Monitoring Leakage Current Signal Denoising of Zinc Oxide Arrester

为了更有效地去除泄漏电流中的噪声成分,提高氧化锌避雷器的在线监测性能,利用改进S变换在信号时频分布处理方面的优良特征,提出一种基于改进S变换的泄漏电流二维时频去噪方法。为了更好地评估泄漏电流信号的去噪效果,还提出波峰陡度值和平均幅值两个新的评估指标。不同噪声强度下的泄漏电流去噪对比试验表明了所提出的去噪方法优越性,其研究成果能为氧化锌避雷器的泄漏电流去噪及其在线监测提供有效的参考和指导。

In order to remove the noise component in the leakage current more effectively,this paper uses the excellent characteristics of improved S transform in time-frequency analysis to propose a two-dimensional time-frequency denoising method based on the improved S transform.In order to better evaluate the denoising effect of leakage current signal,two new evaluation indexes i.e.,wave crest steepness and mean amplitude value are proposed.Comparison experiments of leakage current denoising under different noise intensities show the superiority of the proposed denoising method.The research results of this paper can provide effective reference and technical guidance for leakage current denoising and on-line monitoring of zinc oxide arrester.