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平移不变小波迹消噪方法在局部放电检测中的应用

, PP. 33-40

Keywords: 小波迹,平移不变,变压器,局部放电,消噪

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Abstract:

针对变压器局部放电检测中存在较多干扰的问题,本文采用平移不变小波迹方法对放电信号进行消噪处理。该方法利用小波迹理论抑制信号噪声,并通过循环平移方法强化消噪效果。小波迹建立在小波变换基础之上,利用小波迹组合描述原始放电信号特征,去除了小波系数在各尺度之间的相关性,具有良好的放电特征保持性;循环平移则消除了小波基的平移依赖性,使消噪后的信号更加逼近真实放电信号。仿真及现场数据分析表明,基于平移不变小波迹消噪方法可以有效抑制局部放电噪声干扰,成功提取出有效的局部放电信号,消噪效果优于传统小波方法。

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