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강용철(Yongcheol Kang),이병은(Byungeun Lee),이현웅(Hyunwoong Lee),김유다(Judah Kim),박준수(Junsu Park),이미선(Misun Lee),박지연(Jiyeong Park),이보은(Boeun Lee) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
A current differential relay has been used for transmission line protection. The relay may maloperate in the case of a failure of the secondary circuit of a current transformer (CT) because the differential current is produced. This paper presents an algorithm to detect a failure of a CT using the zero-sequence current. If the magnitude of the zero-sequence current is the same as the magnitude of the current of the other healthy phases, a failure of a CT is detected and then the blocking signal is activated. The proposed algorithm prohibit the maloperation of a differential relay in the case of a CT failure and thus increase the security of the relay.