Title :
A transformer protection technique with immunity to CT saturation and ratio-mismatch conditions
Author :
Sidhu, T.S. ; Gill, H.S. ; Sachdev, M.S.
Author_Institution :
Power Syst. Res. Group, Saskatchewan Univ., Saskatoon, Sask., Canada
Abstract :
This paper describes a digital technique for protecting power transformers. The technique uses positive- and negative-sequence models of the power system in a fault-detection algorithm. The phase voltages and currents at the transformer terminals are used to detect faults. The performance of the proposed technique was studied for a variety of operating conditions using simulated data. The impact of ratio-mismatch and saturation of CTs on the performance of the technique was also examined
Keywords :
current transformers; fault location; microcomputer applications; power engineering computing; power transformer protection; relay protection; CT saturation immunity; differential protection; fault detection; fault-detection algorithm; microprocessor based relays; negative-sequence models; operating conditions; phase currents; phase voltages; positive-sequence models; ratio-mismatch conditions; transformer protection technique; transformer terminals; Circuit faults; Electrical fault detection; Fault currents; Fault detection; Phase detection; Power system faults; Power system modeling; Power system protection; Power system simulation; Power transformers;
Conference_Titel :
Electrical and Computer Engineering, 1998. IEEE Canadian Conference on
Conference_Location :
Waterloo, Ont.
Print_ISBN :
0-7803-4314-X
DOI :
10.1109/CCECE.1998.682740