Research on the Characteristics of Pulse Current during the Development of Internal Discharge Defects in Power Transformers

Pulse current signals can be used to detect internal discharge defects in transformers, thereby helping to take tripping measures before the discharge defects developing into arc breakdown. It this paper, the characteristics of the pulse current signals during the development of discharge defects are studied by experiments in discharge defects model and a 110kV transformer. It has been found that with the discharge defects development, the amplitude and the number of discharge pulses will increase, and the phases of the discharge pulses will decline, and the phenomenon of pulse clustering will occur.