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최기열(Choi Ki Yeol),이덕수(Lee Duck Soo),박문빈(Park Moon Bin),김희택(Kim Hee Taek),장기풍(Chang Ki Poong) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Current transformers(CTs) whose rating is selected per a full load current of a feeder in high voltage system can be easily saturated due to high fault current that may be several hundred times of the full load current of the feeder. However, the protective relay shall operate properly at the fault without mis-operation under the CT saturation. So, in selecting the CT rating, it is necessary to consider the behaviour of CT and a performance of protection scheme in condition where CT can be saturated. In this paper, a performance of CT and a degree of saturation are studied and verified whether its ratings are proper for the operation of the protective relay.