基于相空间的励磁涌流新特征分析

提出一种基于相空间的励磁涌流新特征。该特征利用混沌时间序列重构相空间的原理,把一维时间序列的单相电流采样信号映射到高维相空间,通过比较在相空间内形成的相轨迹来区分励磁涌流和内部故障电流。仿真实验表明:在变压器各种不同运行参数情况下,都可以重构成一个相同的相空间,并且可以清晰地看出励磁涌流与变压器内部故障电流相轨迹的区别,从而为快速识别励磁涌流提供新思路。

A Novel Characteristic of Magnetizing Inrush Current Based on Phase Space

A new characteristic based on phase space theory to identify magnetizing inrush current is introduced.By reconstructing phase space with chaotic time-series,the one-dimensional single current sampled signal is mapped to a hyper-space to become hyperdimensional;meanwhile,the phase locus indicates the difference between inrush current and inner fault current.Simulation results show that it is possible to reconstruct a similar phase space under variable cases,and the phase locus of inrush current is very different from that of inner fault current.