전력계통용 매트릭스형 초전도 한류기의 사고전류 저감특성 연구

Abstract

When the short circuit accident occurred in the power system, the fault current was increased. As the counterplan to solve this problem, the superconducting fault current limiter(SFCL), Which provided the zero impedance at normal state and the high impedance at fault state, was proposed. Among the various SFCLs, We investigated the suppression characteristics for fault current of the matrix-type SFCL. We manufactured the matrix-type SFCL with 2×3 matrix structure using the separated or integrated reactors. For the exact experiment, We simulated the suppression characteristics for fault current of the matrix-type SFCL by using the EMTP program. We also simulated the effects of the external magnetic field in separated or integrated reactors by using the MAXWELL 3D program. We investigated the characteristics of the matrix-type SFCL with separated or integrated reactors according to the variation of resistances and inductances through the experiment. The limited currents of the matrix-type SFCL with separated or integrated reactors after fault instant were nearly identical. Consequently, we confirmed that the critical behavior among the superconducting elements of the matrix-type SFCL with an integrated reactor was more improved than that of the matrix-type SFCL with the separated reactors due to the generation of the larger external magnetic field. In addition, the volume of the matrix-type SFCL with an integrated reactor could be reduced when it was compared to the matrix-type SFCL with the separated reactors.