小波去噪方法在開關(guān)柜故障檢測中的應(yīng)用
發(fā)布時(shí)間:2018-11-12 14:40
【摘要】:中壓開關(guān)柜故障檢測中,傳感器的輸出信號(hào)中往往包含大量的噪聲干擾,特別是在故障發(fā)展的早期階段。小波變換是常用的降噪處理方法,在高壓設(shè)備局部放電檢測中有很長時(shí)間的研究歷史。首先介紹了小波變換原理,并對其與傅里葉變換的區(qū)別進(jìn)行了分析,同時(shí)介紹了常用的小波降噪的實(shí)現(xiàn)方法;其次,搭建了一套開關(guān)柜故障測試平臺(tái),采用一種簡單、實(shí)用的微分電場傳感器實(shí)現(xiàn)了對絕緣子沿面電暈放電信號(hào)的測量,并采用一種商用高頻CT進(jìn)行對比測量;最后,基于文中所述小波去噪的實(shí)現(xiàn)方法,對兩種傳感器的輸出信號(hào)進(jìn)行了小波去噪處理,原始信號(hào)中80 MHz以上頻帶的干擾信號(hào)在小波去噪后得到了有效抑制,小波去噪的效果顯著。
[Abstract]:In the fault detection of medium voltage switchgear, the output signal of the sensor often contains a lot of noise interference, especially in the early stage of fault development. Wavelet transform is a commonly used noise reduction method, which has a long history in the detection of partial discharge in high voltage equipment. Firstly, the principle of wavelet transform is introduced, and the difference between wavelet transform and Fourier transform is analyzed. Secondly, a fault test platform for switchgear is built. A simple and practical differential electric field sensor is used to measure the corona discharge signal along the insulator surface, and a commercial high frequency CT is used to measure the corona discharge signal. Finally, based on the method of wavelet denoising, the output signals of two kinds of sensors are de-noised by wavelet. The interference signals in the frequency band above 80 MHz in the original signal are effectively suppressed by wavelet de-noising. The effect of wavelet denoising is remarkable.
【作者單位】: 云南電網(wǎng)有限責(zé)任公司電力科學(xué)研究院;云南電力試驗(yàn)研究院(集團(tuán))有限公司;防災(zāi)科技學(xué)院;
【基金】:國家高技術(shù)研究發(fā)展計(jì)劃(863計(jì)劃)(2015AA050201)~~
【分類號(hào)】:TM591
本文編號(hào):2327403
[Abstract]:In the fault detection of medium voltage switchgear, the output signal of the sensor often contains a lot of noise interference, especially in the early stage of fault development. Wavelet transform is a commonly used noise reduction method, which has a long history in the detection of partial discharge in high voltage equipment. Firstly, the principle of wavelet transform is introduced, and the difference between wavelet transform and Fourier transform is analyzed. Secondly, a fault test platform for switchgear is built. A simple and practical differential electric field sensor is used to measure the corona discharge signal along the insulator surface, and a commercial high frequency CT is used to measure the corona discharge signal. Finally, based on the method of wavelet denoising, the output signals of two kinds of sensors are de-noised by wavelet. The interference signals in the frequency band above 80 MHz in the original signal are effectively suppressed by wavelet de-noising. The effect of wavelet denoising is remarkable.
【作者單位】: 云南電網(wǎng)有限責(zé)任公司電力科學(xué)研究院;云南電力試驗(yàn)研究院(集團(tuán))有限公司;防災(zāi)科技學(xué)院;
【基金】:國家高技術(shù)研究發(fā)展計(jì)劃(863計(jì)劃)(2015AA050201)~~
【分類號(hào)】:TM591
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