Analysis of Partial Discharge in GIS under Impulse Voltage by Using Quadratic Short-time Fourier Transform

doi:10.11930/j.issn.1004-9649.2013.4.48.5

Abstract

Abstract: In order to analyze the characteristics of signals of partial discharge(PD) in GIS under the impulse voltage, a kind of time- frequency transform theory called the quadratic short-time Fourier transform was applied in analysis of the PD pulse sequence to get the distribution of energy and variation law of signals in the time-frequency plane. In this research, the time-frequency transform of a kind of typical PD pulse sequence containing noise was simulated, which showed that PD pulse could be extracted efficiently. Besides, a kind of spikes defect model was installed in the bus segment of 220 kV GIS and the PD of GIS under impulse voltage was detected. By time- frequency analysis of experiment data, it can be found that the theory of quadratic short-time Fourier transform can be applied in analysis of PD signals efficiently and the variation law of time-frequency spectrogram was affected by the length of window function.

Key words: time-frequency transform, partial discharge, impulse voltage, gas-insulated metal-enclosed switchgear

CLC Number:

TM835.4

REN Zhong, DONG Ming, WU Li-yuan, REN Ming, SI Wen-rong. Analysis of Partial Discharge in GIS under Impulse Voltage by Using Quadratic Short-time Fourier Transform[J]. Electric Power, 2013, 46(4): 48-53.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2013.4.48.5

https://www.electricpower.com.cn/EN/Y2013/V46/I4/48

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