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고속 인터럽터를 적용한 한류기의 전류제한요소에 따른 특성
임인규(In-Gyu Im),최효상(Hyo-Sang Choi),정병익(Byung-Ik Jung) 대한전기학회 2012 전기학회논문지 Vol.61 No.11
With the development in industry, power demand has increased rapidly. As consumption of power has increased, Demand for new power line and electric capacity has risen. However, in the event of fault, problems occur in extending the range of fault coverage and increasing fault current. In these reasons, protection devise is recognized as the prevention of an accident and fault current. This paper dealt with minimizing fault propagation and limiting fault current by adjusting fault current limiter (FCL) with fast interrupter. At this point, we compared and analyzed characteristics between non-inductive resistance and fault current which is limited by superconducting units. In normal state of the power system, power was supplied to the load, but when fault occurred, the interrupter was operated as CT which detected the over-current. Its operation made the limitation of fault current through a FCL. We concluded that the limiter using superconducting units was more efficient with the increase of power voltage. Superconducting fault current limiter with the fast interrupter prevented the spread of a fault, and improved reliability of power system.
임인규 ( In Gyu Im ) 조선대학교 공학기술연구원 2014 공학기술논문지 Vol.7 No.3
In this paper, we propose new fault current limiter as three-phase high-speed interrupter. Three-phase high-speed interrupter was a device that combines a solenoid valve and a vacuum interrupter. When an fault occurs, the high-speed interrupt performs a switching operation to change the line of the fault current. This fault current was limited by the current-limiting part. Therefore, In this paper, we analyzed the characteristics of the high-speed interrupter switching and the characteristics of fault current limit when the fault occurred. As a result, The high-speed interrupter was performed a fast switching operation. Because of this, the fault current was limited a lower and quickly.
김원배 ( Won Bae Kim ),임인규 ( In Gyu Im ),최혜원 ( Hye Won Choi ) 조선대학교 공학기술연구원 2013 공학기술논문지 Vol.6 No.2
In this paper, in the event of line-to-line of line-to-ground, superconductor device fuse in the transformer to limit the fault current for prevent fault range expansion and characteristics of fault current were analyzed according transformer turn-ratio. second and third winding of 3-phase transformer, each phase superconducting fault current limiter and fault current limiter was applied. in normal operation, current flows in the superconducting element of second winding and in event of the fault, the initial fault current was limited. FCL of third winding was limit the fault current after the initial fault current limited. at this time, characteristics of limiting current followed by Single-phase transformer turn-ratio and characteristics of fault current by voltage characteristics was analyzed in 3-phase transformer. At result, increasing the turn-ratio of the second winding, fault current limiter rate was increased. when 3-phase transformer applied to superconducting element, voltage increases but limit rate was no change. because superconducting fault current limiter of second winding was limited initial fault current.
In-Gyu Im(임인규),Hyo-Sang Choi(최효상),Byung-Ik Jung(정병익) 대한전기학회 2013 전기학회논문지 Vol.62 No.9
With increasing demand of power, the equipment of power system is enlarging and the absolute capacity is going up. As a result, when a fault occurs, the fault current is consistently increasing. Therefore, I suggested some solution for limiting the fault current more efficiently. This study shows the characteristics of superconducting limiting elements and normal conducting elements combined with a transformer. We performed a short-circuit test about the fault current by using SCR switching control system operated from a CT. When short circuit accidents happened in the secondary side of a transformer, fault currents flowed and a SCR switching control system was operated. It resulted in a decrease of the fault current in the limited elements of third winding connected in parallel. For this test, we used YBCO thin films and normal conducting elements as the limited elements. Within a cycle, a superconducting fault current limiter with YBCO thin films reduced more than 90% of fault current because the resistance of superconducting elements sustainedly grew. On the other hand, the limiter with normal conductors limited as much as a set value because its resistance characteristic was linear. Consequently, in case of the limiter with superconductor, limiting range of the circuit was wide but the range of protective detection was undefined. In contrast, as for the limiter with normal conductors, limiting range and protection duty were appropriate.