局部放電信號處理相關(guān)方法的研究
楊凱
東南大學 電氣工程學院,江蘇 南京 210096
摘 要:分析了FFT閾值濾波和基于能量比預(yù)處理的FFT閾值濾波法,分別采用這兩種方法對實際監(jiān)測信號進行處理,并對比分析了兩種信號處理結(jié)果。結(jié)果表明,F(xiàn)FT閾值濾波法采用不同的濾波系數(shù)時,信號處理結(jié)果會呈現(xiàn)很大的差異;基于能量比預(yù)處理法能找到能量突變的點,信號處理更具針對性,但采用能量比預(yù)處理閾值濾波過程中應(yīng)當注意選取合適的窗口長度,且在信號處理的時候應(yīng)當盡可能地減少局部放電信號能量的損失。
關(guān)鍵詞:局部放電;FFT濾波;閾值;能量比預(yù)處理
中圖分類號:TM855 文獻標識碼:A 文章編號:1007-3175(2014)12-0014-04
Study Method of Signal Processing in Partial Discharge
YANG Kai
School of Electrical Engineering, Southeast University, Nanjing 210096, China
Abstract: Analysis was made on the fast Fourier transform (FFT) filtering method using threshold value and the FFT filtering method based on energy-ratio pretreatment. These two methods were adopted to carry out treatment for actually monitor signals, and comparison and analysis were made on two kinds of signal treatment results. The result shows that when the FFT threshold value filtering method adopts different filtering coefficient, the signal processing results will show great difference. The filtering method based on energy-ratio pretreatment can find the point where energy suddenly changes, the signal treatment is more pertinent, but in the energy-ratio pretreatment value filtering process, appropriate window length should be adopted, and loss of partial discharge should be reduced in signal treatment.
Key words: partial discharge; fast Fourier transform filtering; threshold; energy-ratio pretreatment
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