| 摘要: |
| 回复电压法是一种有效的无损时域诊断法。针对回复电压法测量获得的回复电压极化谱隐含了丰富的变压器油纸绝缘老化信息，提出一种基于小波包变换的回复电压极化谱分析方法。该方法通过小波包3层分解获得回复电压极化谱各个频段的信号分量，并构建回复电压极化谱的能量特征矢量来分析变压器油纸绝缘老化状态。为验证该方法的可靠性，通过对2台不同老化状态变压器的回复电压极化谱进行小波包3层分解得到各自的能量特征矢量来分析其绝缘介质老化情况。分析结果表明:基于小波包分解得到的回复电压极化谱能量特征矢量，可以有效地诊断变压器油纸绝缘老化状况，为变压器油纸绝缘老化诊断提供新方法。 |
| 关键词: 小波包变换 回复电压极化谱 油纸绝缘 特征值 |
| DOI：10.7667/PSPC160836 |
| 投稿时间：2016-06-07修订日期：2016-09-05 |
| 基金项目: |
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| Diagnostic method of transformer insulation aging based on the recovery voltage polarization spectrum’ wavelet packet transform |
| GUO Hongying |
| (Fujian Electric Power Engineering Co., Ltd., Fuzhou 350013, China) |
| Abstract: |
| The return voltage method is an effective and nondestructive diagnostic method in time domain. In view of the polarization spectrum of the return voltage implying rich aging information of the transformer oil-paper insulation, this paper proposes an analysis method for the return voltage polarization spectrum based on wavelet packet transform. The 3 layer’s decomposition of wavelet packet is exploited to obtain the each frequency band of return voltage polarization spectrum, and also the energy feature vector of return voltage polarization spectrum is constructed for analyzing the aging condition of transformer oil-paper insulation. In order to verify the reliability of the method, it uses the energy feature vectors which are abtained by 3 layer’s decomposition of wavelet packet of return voltage polarization spectrum of 2 different aging state’s transformer to analyze the aging of insulating medium. The analysis results show that the energy feature vector of return voltage polarization spectrum derived from the wavelet packet decomposition method can effectively diagnose the aging condition of transformer oil-paper insulation, which provides a new method for aging diagnosis of transformer insulation. |
| Key words: wavelet packet transform return voltage polarization spectrum oil-paper insulation feature value |
