局部放电分析中时间频率和时间尺度变换的兴趣和效用

Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316) Pub Date : 2002-04-07 DOI:10.1109/ELINSL.2002.995987

C. Caironi, D. Brie, L. Durantay, A. Rezzoug

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引用次数: 12

摘要

近20年来，时频变换和时尺度变换的研究进展迅速。这一发展和数值采集的进步使得利用这些数学工具来分析异步电动机绝缘中的局部放电(PD)成为可能。已有一些论文利用小波分析工具对局部放电进行分析。本文概述了时频变换和时标变换在异步电动机定子局部放电分析中的应用。第一部分介绍了短时傅里叶变换和维格纳分布两种时频变换。给出了实现STFT的数学工具。给出了从数值噪声中提取PD信号的一个实例，并讨论了其结果。第二部分以时频变换为例对小波进行了分析。

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Interest and utility of time frequency and time scale transforms in the partial discharges analysis

The development of time-frequency and time-scale transforms has progressed quickly for 20 years. This development and the progression of the numerical acquisition enable the utilization of these mathematical tools to analyze partial discharges (PD) in the induction motors insulation. Some papers have been written about the wavelet tools in order to analyze the partial discharges. This paper is a tutorial overview of the time frequency and time scale transforms applied to the PD analysis on the stators of the induction motors. In the first part two time-frequency transforms are introduced: short time Fourier transform and Wigner distribution. The mathematical tools for the implementation of the STFT are given. An example of extraction of a PD signal from numeric noise is given and its results discussed. In the second part the wavelets are presented on the same case study as for the time frequency transforms.

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Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)

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