一种变压器局放降噪新算法

A New Denoising Method for Transformer Partial Discharge Signal

将小波分析与数学形态学融合,提出小波—形态学融合算法,并分别利用小波—形态学融合算法、小波阈值法、小波模极大值法对变压器局部放电信号进行降噪处理。分析结果表明,在信噪比较大的局部放电初期,小波—形态融合方法不仅能够更有效地消除噪声,且能完好地保留局部放电信号的形态特征,适用于变压器局部放电发展的全过程。

This paper introduces a wavelet-morphology method that combines the wavelet analysis with mathematical morphology. By use of different methods, i.e. wavelet-morphology method, wavelet threshold method, and wavelet modulus maximum method, to denoise the partial discharge signal, this paper proves that, during the initial stage of partial discharge with a strong signal-to-noise ratio, the wavelet-morphology method can effectively eliminate noise and well keep the morphological features. This method is applicable to the whole process of partial discharge development of transformers.