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《Electric Power Science and Engineering》 2009-05
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One New Scheme to Discriminate Inrush Current from Internal Fault of Power Transformer Based on EMD Decomposition

Luo Weiqiang,Bian Tie(Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Educa-tion,North China Electric Power University,Baoding 071003,China)  
One new algorithm based on EMD was presented for fast discrimination between inrush current and fault current of power transnformers.The method was based on that the waveform of the inrush distorts seriously,while the fault current nearly keeps sinusoid.The complicated signal can be decomposed into a finite intrinsic mode functions(IMF) by the EMD,then defined and computed the projection area on X-axis of each IMF,the specific gravity of SIMF---KCi,and the maximum of KCi---Kmax.We can get a new scheme of transformer-protection based on comparing the difference between inrush and fault current.Theoretical analysis and dynamic simulation results showed that the method can precisely distinguish inrush and fault current,fault clearance time is about 20ms.Moreover,it is convenient to achieve and hardly to be affect by aperiodic component.
【CateGory Index】: TM407
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