Title :
A directional current differential protection against CT saturation in two sides fed networks
Author_Institution :
ECE Dept., Ilam Univ. Ilam, Ilam, Iran
Abstract :
A phase angle comparison method for detection of current-transformer (CT) saturation and stability against mis-operation on heavy external faults in numerical current differential relay is presented in this paper. The proposed directional criterion is based on comparison of line currents phase angle of two sides of the power transformer. Defined criterion can differentiate saturation condition from normal condition and various internal faults. The merit of this method is demonstrated by simulation of different faults and saturation conditions on a power transformer using ATP/EMTP software.
Keywords :
EMTP; current transformers; electrical faults; fault diagnosis; power system stability; power transformer protection; relay protection; ATP-EMTP software; current transformer fault; current transformer saturation detection; current transformer stability; directional current differential protection; external fault; internal fault; line current phase angle comparison method; numerical current differential relay; power transformer; Circuit faults; Current transformers; Fault currents; Harmonic analysis; Power system harmonics; Power transformers; Relays; CT saturation; differential relay; directional criterion; phase angle;
Conference_Titel :
Power Systems Conference and Exposition (PSCE), 2011 IEEE/PES
Conference_Location :
Phoenix, AZ
Print_ISBN :
978-1-61284-789-4
Electronic_ISBN :
978-1-61284-787-0
DOI :
10.1109/PSCE.2011.5772523
