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《Electric Power Automation Equipment》 2010-10
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Identification of transformer excitation inrush based on correlation analysis between two Fourier algorithms

CHEN Dazhuang1,HUANG Jiadong1,ZHANG Ling2(1.School of Electrical & Electric Engineering,North China Electric Power University, Baoding 071003,China;2.Xiamen Power Supply Bureau,Xiamen 361004,China)  
As the excitation inrush is seriously distorted while the fault current is nearly sinusoid,a method is proposed to identify the excitation inrush current of transformer.Full-wave Fourier algorithm and half-wave Fourier algorithm are used to respectively calculate the imaginary part of fundamental differential current,and the normalized correlation coefficient between them is then deduced by correlation analysis,which is compared with a setting to identify the inrush current.Dynamic tests are carried out for four transformer operating conditions:energizing without load,inter-phase short-circuit,phase-ground short-circuit and energizing with fault.Experimental data are analyzed,which verifies the correctness and effectiveness of the proposed approach.
【CateGory Index】: TM407
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