Journal of Applied Science and Engineering

Published by Tamkang University Press


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Panpan Cao1, Jianqiao Ma1This email address is being protected from spambots. You need JavaScript enabled to view it., Guangze Yang1, and Sheng Li

1College of Automation & Electrical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
2CCCC Mechanical and Electrical Engineering Co., Ltd, Beijing 101318, China


Received: August 10, 2022
Accepted: March 13, 2023
Publication Date: May 2, 2023

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

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Partial discharge (PD) acoustic signal detection is one of the effective means to assess the insulation status of power transformers. In actual monitoring, white noise is likely to cause strong interference to the partial discharge acoustic signal of the transformer, which seriously affects the discharge fault identification and monitoring results. In order to suppress the interference of white noise in partial discharge detection, this paper proposes an adaptive partial discharge based on the combination of variational mode decomposition (VMD) and principal component analysis (PCA) based on improved Spearman correlation coefficient. The white noise suppression method is analyzed for the separation and denoising of partial discharge acoustic signals in the environment of −10 ∼ 10 dB. Firstly, the Spearman correlation coefficient is used to determine the optimal number of decomposing modes of VMD. Then the decomposed modal components are adaptively reduced and reconstructed by principal component analysis to remove redundant clutter interference and reduce the influence of human error. Finally, through the simulation signal and actual discharge pulse acoustic signal are tested for denoising. The results show that SVMD-PCA can suppress the interference of white noise in partial discharge acoustic signals and extract clean discharge pulse signal characteristics, the method has enhanced anti-noise performance and can effectively suppress white noise interference.

Keywords: Spearman correlation coefficient; variational mode decomposition; partial discharge; audible signal; denoising

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