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내삽법 기반의 최소자승법을 이용한 개선된 CT 포화 복원 알고리즘
류기찬(Kichan Ryu),강상희(Sang-Hee Kang),이봉현(Bong-Hyun Lee) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
A saturation of magnetic flux in the core may occur when a large primary current flows when the iron-cored current transformer is used. This saturation makes the distorted secondary current of the CT. the distorted secondary current may cause the mal-operation or operation time delay of protective relays. CT compensation algorithm using The LSQ(Least Square) fitting method has a problem. It needs to acquire enough data for executing this algorithm without an error. In this paper, an enhanced algorithm using interpolation based LSQ(Least Square) Fitting Method is proposed. The Lagrange Interpolation Method is used for the interpolation and CT is simulated by EMTP. The results show that the proposed algorithm can accurately compensate a distorted secondary current more than existing Algorithm when the saturation severely occurs.