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《安徽电气工程职业技术学院学报》 2005-01
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The Analyzing of Distant Short-Circuit Fault Current in Rapid Transit Systems Based on Wavelet Packet Transform

XIE Xiao-di(Hefei University of Technology, Hefei 230001, China)  
This paper discusses three distant short-circuit protections for the rapid transit systems, and points out that or the Fourier transform cannot always distinguish between distant faults and train starting currents. Based on the characterization that the time constants of the distant short-circuit fault currents exhibit a time varying due to the skin effect of the track, a novel method using Haar wavelet packet transform is proposed in this paper. The simulation results show that the wavelet packet transform can give a good discrimination between the distant fault current and the train starting current.
【CateGory Index】: U231
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