| 基于峰度的电力变压器铁芯松动故障在线监测方法 |
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| 引用本文： | 郭洁,陈祥献,黄海,林日磊,周才康.基于峰度的电力变压器铁芯松动故障在线监测方法[J].仪器仪表学报,2010,31(11). |
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| 作者姓名： | 郭洁 陈祥献 黄海 林日磊 周才康 |
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| 作者单位： | 浙江大学仪器科学工程学系;三变科技股份有限公司; |
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| 基金项目： | 国家863高技术研究项目，浙江省重大科技专项 |
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| 摘 要： | 本文提出一种对电力变压器铁芯松动故障进行在线监测和估计的方法。通过改变变压器铁芯的压紧力得到模拟松动故障情况下的铁芯振动信号,使用谱峰度方法验证并分析了变压器铁芯振动信号中高频分量的冲击特性,在此基础上采用小波变换对铁芯振动信号进行分解,对分解得到高频分量计算其峰度值并用以监测铁芯压紧力的减小趋势。对实验变压器不同测点的多组数据分析表明,谱峰度能有效检测铁芯振动信号中的较高频率冲击成分及铁芯压紧力发生较大变化的情况,铁芯振动信号小波域中高频成分的峰度值能够很好的反映出铁芯压紧力变化的趋势。本方法准确的表述了铁芯振动信号中与松动故障相关的统计特性,为电力变压器铁芯的故障监测提供了一种可行的方法。
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| 关 键 词： | 铁芯振动 电力变压器 峰度 谱峰度 |
Application of kurtosis in on line detection of transformer iron core looseness |
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| Guo Jie,Chen Xiangxian,Huang Hai,Lin Rilei,Zhou Caikang.Application of kurtosis in on line detection of transformer iron core looseness[J].Chinese Journal of Scientific Instrument,2010,31(11). |
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| Authors: | Guo Jie Chen Xiangxian Huang Hai Lin Rilei Zhou Caikang |
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| Affiliation: | Guo Jie1,Chen Xiangxian1,Huang Hai1,Lin Rilei2,Zhou Caikang2(1 Department of Instrumentation Science and Engineering,Zhejiang University,Hangzhou 310027,China,2 Sanbian Sci-Tech Co.,Ltd.,Sanmen 317100,China) |
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| Abstract: | This paper proposes a method that combines wavelet decomposition and kurtosis to detect the looseness of transformer core. The loose conditions are simulated by decreasing the clamping pressure of the core gradually, and spectral kurtosis is used to analyze the impulses occurred in core vibration signals in high frequency band. The kurtosis of high frequency components derived by discrete wavelet analysis is applied to measure the clamping pressure trend. The analysis of multiple groups of data sampled from... |
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| Keywords: | core vibration power transformer kurtosis spectral kurtosis |
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