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《Power System Technology》 2005-06
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A NEW METHOD TO IDENTIFY INRUSH CURRENT AND SHORT CIRCUIT CURRENT OF TRANSFORMER BASED ON CORRELATION FUNCTION

MA Jing,WANG Zeng-ping,XU Yan (School of Electrical Engineering,North China Electric Power University, Baoding 071003,Hebei Province,China)  
When longitudinal differential protection is applied to transformer protection, how to identify the inrush current and short circuit current caused by internal fault is the key problem. Here, regarding the inrush current and short circuit current as the random signal, the sampled data are analyzed by correlation function principle in the digital signal processing and the self-correlation function of the sampled data is calculated. Through the similar comparison operation conducted by standard self-correlation function formed with sinusoidal current the short circuit current and the inrush current can be distinguished by the magnitude of similarity coefficient. The results of theoretical analysis and dynamic simulation verify the feasibility of the proposed method.
【CateGory Index】: TM772
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