改进TD与小波变换励磁涌流识别

Magnetizing inrush current identification based on improved TD and wavelet transform

依据小波变换中的多分辨分析,采用小波变换后二尺度上的小波系数提取小波能量比均值来表示小波系数的变化。引入改进微分跟踪器(TD),保证波形结构稳定,用加速波形成区分励磁涌流与故障电流。应用MATLAB搭建了变压器励磁涌流与故障电流仿真模型。

With multi-resolution analysis of wavelet transform,two-scale wavelet coefficients obtained from wavelet transform are applied to extract average wavelet energy rate for describing the change of wavelet coefficients.The improved differential tracker(TD)is introduced to stabilize the waveform structure,and the acceleration wave form is used to distinguish the excitation inrush and fault current.With MATLAB,we build both the transformer excitation inrush and fault current simulation models.