Title :
Identifying internal faults of transformers through the similarity degree between voltage and current
Author :
Guocai, Shang ; Dachuan, Yu
Author_Institution :
Dept. of Electr. Eng., North Chin Electr. Power Univ., Hebei, China
Abstract :
A new principle of transformer differential protection is presented in this paper. By comparing the voltage on the source side and the differential current in a specific time interval. An internal fault in a transformer can be discriminated. The differential protection scheme based on the new principle is able to clear the internal fault very quickly (within about 20 ms) and be affected by CT saturation
Keywords :
power system faults; power system identification; power transformer protection; 20 ms; current transformer saturation; differential current; differential protection scheme; internal fault clearing; internal faults identification; power transformer differential protection; source side voltage; specific time interval; voltage-current similarity degree; Circuit faults; Current measurement; Fault currents; Fault diagnosis; Power engineering and energy; Saturation magnetization; Senior members; Shape measurement; Surge protection; Transformers;
Conference_Titel :
Power Engineering Society Winter Meeting, 2000. IEEE
Print_ISBN :
0-7803-5935-6
DOI :
10.1109/PESW.2000.847637
