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New Principle of Transformer Protection Based on Active Power and Power Factor

Hu Jing1,Zhou Feifei2(1.Huadian Power Design Institute Co.,Ltd.,Baoding 071003,China;2.School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,China)  
This paper presents a new strategy based on active and power actor to identify transformer inrush current.This paper analyzes the different active power and power actor changes in the magnetizing inrush and internal fault conditions.When the transformer switches on a non-load transformer in a state of internal fault,due to the presence of fault slip,active power and power actor are greater than the ones when the transformer switches on a non-load transformer;and power factor in determining the minor faults can make up for lack of active power for judging the fault.By using these,this strategy not only could quickly determines whether the transformer internal fault occurred,but also is easy to implement and compute.The results of dynamic analog testing confirmed that the strategy was not affected by inrush current and could quickly and reliably reflect the transformer internal fault,the performance was better than the strategy based on harmonic restraint.
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