| 电力变压器绝缘局部放电的声发射频谱 |
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| 引用本文： | 金显贺,朱德恒,谈克雄.电力变压器绝缘局部放电的声发射频谱[J].电工技术学报,1989(4). |
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| 作者姓名： | 金显贺 朱德恒 谈克雄 |
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| 作者单位： | 清华大学，清华大学，清华大学 |
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| 摘 要： | 本文针对电力变压器绝缘局部放电的几种典型形式进行了实验室模拟,用微机测量系统采集了六种模型局部放电的声、电信号,得出了声发射频谱、声、电信号时延关系,以及在较厚的绝缘纸内发生放电时声信号的衰减规律和频谱的变化。用声发射法在线监测变压器的局部放电时,变压器铁心的磁噪声是稳定而严重的干扰信号、本文分析了磁噪声信号的时域及频域特征。基于变压器绝缘局部放电模型的声频谱和磁噪声的频谱,本文给出了用声发射法检测电力变压器绝缘局部放电的频带范围,并论述了根椐不同的放电声频谱判断故障类型的可能性。
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| 关 键 词： | 声发射检测 局部放电 频谱分析 磁噪声 电力变压器 |
The Frequency Spectra of Acoustic Emission During Partial Discharge in Power Transformer Insulation |
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| Jin Xianhe Zhu Deheng Tan Kexiong.The Frequency Spectra of Acoustic Emission During Partial Discharge in Power Transformer Insulation[J].Transactions of China Electrotechnical Society,1989(4). |
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| Authors: | Jin Xianhe Zhu Deheng Tan Kexiong |
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| Affiliation: | Qinghua University |
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| Abstract: | In order to Simulate the partial discharge(PD)in insulation of power transfor- mer,6 typical oil gaps were designed.The frequency spectra of acoustic emission (AE)of PD in those gaps were presented and investigated with a computer aided measuring system.The attenuation of AE and variation of its frequency spectrum in oil-impregneted paper were studied. Magnetic,noise in transformer core is the steady and serious interference for PD detection with AE method.In this paper the frequency spectra of magnetic noise were presented and studied. Based on the knowledges of acoustic frequency spectra of PD and magnetic noise,the proper frequency band width of AE measuring system for PD detection in power transformer was recommended. |
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| Keywords: | AE detection Partial discharge Frequency spectrum analysis Magnetic noise Power transformer |
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