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《Power System Technology》 2011-09
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A Method to Distinguish Inrush Current of Power Transformer From Fault Current Based on Amplitude Characteristics

XU Yan,ZHOU Feifei(School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,Hebei Province,China)  
An amplitude characteristic based principle for transformer differential protection is proposed.The proposed principle uses empirical mode decomposition(EMD) and singular point detection algorithm to accurately fault moment,and then corresponding amplitude of fundamental current is calculated by two-instantaneous-value-product algorithm.Calculation results show that due to the existence of non-saturation stage,the fundamental amplitude of inrush current is small,however because of the influence of faulty branch the fundamental amplitude of fault current is far larger than the threshold,therefore whether internal fault of power transformer occurs or not can be reflected by the fundamental amplitude relative to the threshold.Dynamic simulation results show that the proposed algorithm is convenient to implement and possesses following advantages: light calculation burden and reliable and rapid action.
【Fund】: 国家自然科学基金项目(50777016)~~
【CateGory Index】: TM407;TM772
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