摘要
提出了一种基于滤波和小波理论的区分励磁涌流和短路电流的新方法 ,通过滤波后的小波变换的模极大值提取涌流和短路电流的突变点特征 ,从而清楚地区分涌流和短路电流 。
A new scheme is proposed paper to distinguish inrush and internal fault occrred in the transformer.This scheme is based on filtet and the wavelut transform.The feature of the inrush and fault current is extracted from the local maxima of the wavelet fransforms and described clearly.The results of the digital simulation show that the method can identify fault current and inrush current.
关键词
励磁涌流
滤波
小波变换
变压器
保护
inrush current
wavelet transform
filter
transformer protect
