局部放電信號處理相關方法的研究
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果。結果表明,F(xiàn)FT閾值濾波法采用不同的濾波系數(shù)時,信號處理結果會呈現(xiàn)很大的差異;基于能量比預處理法能找到能量突變的點,信號處理更具針對性,但采用能量比預處理閾值濾波過程中應當注意選取合適的窗口長度,且在信號處理的時候應當盡可能地減少局部放電信號能量的損失。
關鍵詞:局部放電;FFT濾波;閾值;能量比預處理
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
參考文獻
[1] 李茂軍,劉建明.變壓器局放信號檢測中白噪聲和周期性干擾的抑制[J].長沙理工大學學報:自然科學版,2007,4(2):45-48.
[2] 宋登峰.高壓開關柜局部放電監(jiān)測系統(tǒng)的超高頻傳感器設計[D].焦作:河南理工大學,2011.
[3] 唐炬,黃江岸,張曉星,等.局部放電在線監(jiān)測中混頻周期性窄帶干擾的抑制[J].中國電機工程學報,2010,30(13):121-127.
[4] 王曉蓉,楊敏中,嚴璋.電力設備局部放電測量中抗干擾研究的現(xiàn)狀和展望[J].電網(wǎng)技術,2000,24(6):41-45.
[5] Ma X, Zhou C, Kemp I J.Automatic wavelet analysis and its application in partial discharge detection[J].IEEE Electrical Magazine,2002,18(2):37-47.
[6] 歐陽明鑒.小波變換在局部放電聲信號提取中的應用[D].天津:天津大學,2005.
[7] 謝顏斌.用復小波變換抑制局部放電信號中白噪聲的研究[D].重慶:重慶大學,2006.
[8] 彭莉.復小波變換抑制局部放電白噪聲干擾[D].重慶:重慶大學,2007.
[9] 李天云,程思勇,楊梅,等.FFT與小波分析應用于抑制局部放電窄帶干擾[J].高電壓技術,2007,33(12):71-75.
[10] 肖燕.GIS局部放電在線監(jiān)測和故障診斷技術的研究[D].上海:上海交通大學,2006.
[11] 謝良聘,朱德恒.FFT頻域分析算法抑制窄帶干擾的研究[J].高電壓技術,2000,26(4):6-8.
[12] 盧毅,韓志琨,陳瑜.基于能量比預處理的FFT窄帶濾波方法[J].東南大學學報:自然科學版,2010,40(5):948-951.
[13] 左國平,王彥春,隋榮亮.利用能量比法拾取地震初至的一種改進方法[J].石油物探,2004,43(4):345-347.