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CT와 CCVT의 오차를 고려한 거리 계전기의 응동 분석
강용철(Yong-Cheol Kang),정태영(Tai-Ying Zheng),최재선(Jae-Sun Choi),강해권(Hae-Gweon Kang),김광무(Kwang-Moo Kim),장성일(Sung-Il Jang),김용균(Yong-Gyun Kim) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.11
A distance relay has been widely used for transmission line protection. The distance relay detects a fault based on the calculated impedance i.e. the ratio of the voltage to the current measured from a current transformer (CT) and a coupling capacitor voltage transformer (CCVT), respectively. When a fault occurs and a C saturates due to the magnitude of fault current, dc component, primary time constant, and the remanent flux of the iron core, the secondary current of a CT is distorted. On the other hand, non-fundamental components generated during a fault can increase the error of a CCVT, particularly when a fault distance is short. The distortion of the current and voltage can cause mal-operation or the operating time delay of a distance relay. This paper describes the response of a distance relay considering the errors of a CT and a CCVT. The results indicate that the severe distortion of a CT and a CCVT have noticeable effect to a distance relay.