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강용철(Yong-Cheol Kang),최재선(Jae-Sun Choi),정태영(Tai-Ying Zheng),강해권(Hae-Gweon Kang),장성일(Sung-Il Jang),김용균(Yong-Gyun Kim),유영식(Young-Sik Ryu) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.11
A protection current transformer (CT) has been widely used for protection devices. When a fault occurs, a CT should provide the faithful reproduction of the primary fault current However, a CT may saturates due to the magnitude of fault current, dc component, primary time constant, and the remanent flux of the iron core, and the secondary current of a CT is distorted. The distorted current can cause mal-operation or the operating time delay of a protection relay. This paper provides a modeling of CT saturation using EMTP-RV. The performance of the proposed CT saturation modeling was investigated under various fault conditions varying the fault distance, fault inception angle, and remanent flux of the iron core. The results indicate that the proposed EMTP-RV modeling can operate correctly, and the reasons for CT saturation are verified by EMTP-RV simulations.