A Discriminating Algorithm between Magnetizing Inrush and Internal Faults of Transformers Using Difference of a differential current

차동전류의 변화율을 이용한 변압기의 여자돌입과 내부사고 구분 알고리즘

This paper presents a discriminating algorithm between magnetizing inrush and internal faults of transformers using difference of a differential current. Incase of inrush, change of magnetizing inductance repeats. Thus, second difference of differential current periodically shows pulse while periodic pulse is not represented in case of internal winding fault. The proposed algorithm is suitable irrespective of the amount of remanent flux.