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New ways to distinguish the surge of the transformer

FENG Yong, LIU Huan_zhang, CHEN Xue_dao (Central China Electric Power Dispatching Center,Wuhan 430077, China)  
The paper presents two ways to distinguish the surge of the transformer.They are twi_fold derivative method got by analysing the characteristics of current waveform and ΔU method got from the theory of exciting surge. These two methods are more simple and reliable compared with the others.
【CateGory Index】: TM835
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