电力系统自动化2001，Vol.25Issue(10)：27-30,4.
基于小波变换的电流互感器饱和实时检测新判据
A NEW ON-LINE CRITERION FOR CURRENT TRANSFORMER SATURATION BASED ON WAVELET TRANSFORM
摘要
Abstract
The bus differential protection based on instantaneous values of currents is the most useful scheme nowadays. But it is easy to be influenced by current transformer saturation and to make mal-operations. One of solutions is to block the relay when current transformer is saturating. But this method can make the relay refuse to trip when a fault transfers to inside the protected zone from outside. In this paper, a new method is proposed to detect and distinguish current transformer saturation and linear sections, and the wavelet transform theory is used to detect the singular points of signals. Because the current waveforms got from current transformer have singularity at the points of fault occurrence, the start of saturation and the end of saturation, we can distinguish these points according to their characters on-line. Thus, to open or block it in current transformer linear or saturation sections, the bus differential protection can be realized.关键词
母差保护/电流互感器饱和/小波变换分类
信息技术与安全科学引用本文复制引用
曹豫宁,李永丽,张兴华,梅云..基于小波变换的电流互感器饱和实时检测新判据[J].电力系统自动化,2001,25(10):27-30,4.
