小波分析在变压器差动保护中的应用  

Application of Wavelet Analysis in Transformer Differential Protection

作　　者：刘建辉[1] 

机构地区：[1]大庆石油学院电气信息工程学院

出　　处：《可编程控制器与工厂自动化（PLC FA）》2007年第7期95-97,共3页Programmable controller & Factory Automation(PLC & FA)

摘　　要：正确区分电力变压器励磁涌流和内部故障电流是变压器保护中一个尚未得到完善解决的问题,变压器励磁涌流具有明显的奇异性,小波变换在多尺度分析和时频域表现优秀,适合用来提取信号边缘和峰值突变的特征,能够很好的检测信号奇异性。对励磁涌流和故障电流进行小波分析,然后对信号小波变换后的波形进分析,可直接利用波形特点进行判断。How to distinguish the inrush current and internal fault current is a problem that＇s not resolve well. Magnetizing inrush current has obvious singularity. Wavelet transform does well in mufti-scale and time-frequency domain,and it is particularly well adapted to extract the characteristic of signal＇s edge and peak value, and can check up the singularity well. Through the wavelet transform to identify the magnetizing inrush current and inner fault current, and analyses the wave by wavelet transform, the distinguishing could be done by using directly these features of wave.

关 键 词：变压器 小波变换 励磁涌流 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]