| 小波变换去噪在绝缘子污秽放电声发射监测中的应用 |
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| 引用本文： | 李红玲,文习山,舒乃秋,姚刚.小波变换去噪在绝缘子污秽放电声发射监测中的应用[J].电力系统保护与控制,2010,38(6):56-59. |
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| 作者姓名： | 李红玲 文习山 舒乃秋 姚刚 |
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| 作者单位： | 武汉大学电气工程学院，湖北 武汉430072 |
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| 摘 要： | 研究了绝缘子污秽放电声发射监测中用小波变换进行信号提纯与消噪的实现问题。在大量绝缘子污秽放电声发射试验基础上，分析总结了污秽放电声发射信号的共有特点。并提出一种基于声发射信号小波变换的小波基选取方法。采用选取的最优小波函数rbio3.9对声发射信号进行频谱分析，提取了声信号的特征频带，并对重构后的信号进行二重小波分解消噪。两组声发射信号的小波变换消噪结果表明，小波变换提高了信号信噪分离结果的可靠性，有效地降低了噪声对污秽放电声发射信号的影响。
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| 关 键 词： | 绝缘子 污秽放电 声发射 小波变换 频谱分析 降噪 |
Application of wavelet transforms denoising in acoustic emission detection of polluted insulator discharge |
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| LI Hong-ling,WEN Xi-shan,SHU Nai-qiu,YAO Gang.Application of wavelet transforms denoising in acoustic emission detection of polluted insulator discharge[J].Power System Protection and Control,2010,38(6):56-59. |
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| Authors: | LI Hong-ling WEN Xi-shan SHU Nai-qiu YAO Gang |
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| Affiliation: | School of Electrical Engineering;Wuhan University;Wuhan 430072;China |
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| Abstract: | This paper studies how to use wavelet transform method to purify and denoise in acoustic emission monitoring of polluted insulator discharge.Based on numerous acoustic emission experiments of polluted insulators discharge,the common characteristics of acoustic emission wave emitted from polluted insulators discharge are summarized.And an effective method to select best wavelet basis is proposed based on wavelet transform of acoustic emission signals.Then the appropriate wavelet function is chosen.And freque... |
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| Keywords: | insulator polluted discharge acoustic emission wavelet transform frequency analysis denoising |
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