Analysys on Transformer Differential Protection Action caused by TA Breakdown

During the set-up of the voltage of the 1# power generator in the Lijiaxia power plant,the insulation of the TA winding for integrated transformer differntial protection was broken down,the intgrated transformer differential protection activating a trip.Based on calculation of traounding current,this paper analyzes the features of the intearated transformer differential protection and the cause of the protection action.