S变换在电力电缆局部放电信号时频分析中的应用

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Abstract For partial discharge detection in power cables, a new-type S transform time-frequency analysis method is introduced to distinguish the partial discharge signals from field noise. Partial discharge signal is a typical non-stationary signal, and its characteristics can not be clearly expressed only by time-domain or frequency-domain information. S transform is a combination and extension of continuous wavelet transform and short time Fourier transform (STFT). The S transform method employs a Gauss window, whose amplitude and width change with frequency. S transform achieves better time resolution in high frequency proportion, and better frequency resolution in low frequency proportion. Compared with traditional time-frequency representation like STFT and Gabor transform, the S transform is used to analyze the simulation and on-site detection signals from power cables earthing strap. The results show that S transform is effective in extracting partial discharge characteristic information.

Key words： Power cables partial discharge S transform time-frequency analysis pulse characteristic

Received: 28 March 2009 Published: 04 March 2014

PACS:

TM247

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	Articles by authors
	Guo Canxin
	Yong Ming
	Xu Minhua
	Li Qing
	Yao Linpeng
	Qian Yong
	Huang Chengjun
	Jiang Xiuchen

Cite this article:

Guo Canxin,Yong Ming,Xu Minhua等. Application of S Transform for Time-Frequency Analysis of Partial Discharge Signals in Power Cables[J]. Transactions of China Electrotechnical Society, 2010, 25(11): 9-14.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2010/V25/I11/9

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