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《Proceedings of the Csee》 2004-02
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RESEARCH ON NOVEL TRANSFORMER PROTECTION BASED ON THE CHARACTERISTICS OF VOLTAGE AND DIFFERENTIAL CURRENT

XU Yan, WANG Zeng-ping, YANG Qi-xun (Department of Electrical Engineering, North China Electric Power University, Baoding 071003, China)  
For the problem of discrimination between inrush current and internal fault current, this paper is to put forward a new method for distinguishing magnetizing inrush based on the characteristics of voltage and differential current. The principle is simple and the implementation is easy. None of anticipated internal parameters is needed. The advantages of the method are convenient data acquisition, fewer computation, reliable and quick operation. ATP simulation tests show that the method is reasonable. The results of dynamic analog testing and analysis of transformer operation data in the field confirmed that the method is able to clear the internal fault reliably and quickly.
【CateGory Index】: TM41
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