고속 인터럽터를 적용한 자속상쇄형 한류기 연구

Abstract

Due to the current economic growth, the increase in the national income and abnormal temperature, the amount of electricity demand is soaring. To satisfy such demand, the capacity of power facilities have been expanded. However, such an expansion reduced the total impedance of the power system, which increased the number of faults in the system as well as the size of fault-current, which is now exceeding the protective capacity of the existing protective equipment. This thesis proposed a flux-offset type limiter using a high-speed interrupter as a new fault current limiter. The proposed flux-offset type fault current limiter applied a high-speed interrupter to the transformer, using a flux-offset phenomenon of the transformer to limit fault-current. The load was connected to the primary winding of the transformer while the high-speed interrupter was applied to the secondary winding to create a short circuit. After having constructed a simulation system, We tested various types of ground faults and other types of faults. The test results showed that the proposed model limited the fault-current effectively under a single, double, triple line-to-ground fault and line-to-line fault situations within the average of 11msec. Also the comparison tests between the transformer-type SFCL and the proposed model showed that the proposed fault current limiter limited the fault-current much faster.