公茂法,侯林源,司丹淼,周立人,柳岩妮.基于小波模极大值理论的励磁涌流新判据研究[J].电测与仪表,2016,53(17):. Gong Maofa,Hou Linyuan,Si Danmiao,Zhou lireni,Liu Yanni.Research of inrush current identification based on wavelet and modulus maximum[J].Electrical Measurement & Instrumentation,2016,53(17):.
基于小波模极大值理论的励磁涌流新判据研究
Research of inrush current identification based on wavelet and modulus maximum
Aiming at the problem that inrush current can lead to the maloperation in differential transformer protection, this paper came up with a new method to identify inrush current and fault current based on wavelet and modulus maximum. Because inrush current contains a large component of aperiodic component and dead angle, while fault current always keeps its fundamental frequency. The new method is just based on these characteristics. Firstly, it uses wavelet to decompose original signal, then select maximal points based on the theory of modulus maximum, by using the numerical relations between maximal points can distinguish different current signal. By adopting Matlab/Simulink, the simulation showed that this method can distinguish inrush current and fault current reliably.
