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모의전력계통에 적용된 두 개의 자기결합 회로를 갖는 직렬연결형 초전도 전류제한기의 전류제한 특성 분석
고석철,이신원,Ko, Seok-Cheol,Lee, Shin-Won 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.1
The series connection-type superconducting fault current limiter (SFCL) with two magnetically coupled circuits was suggested and its effectiveness through the analysis on the current limiting and recovery characteristics was described. The fault current limiting characteristics of the proposed SFCL as well as the load voltage sag compensating characteristics according to the winding direction were investigated. To confirm the fault current limiting and the voltage sag suppressing characteristics of the this SFCL, the short-circuit tests for the simulated power system with the series connection-type SFCL were carried out. The series connection-type SFCL designed with the additive polarity winding was shown to perform more effective fault current limiting and load voltage sag compensating operations through the fast quench occurrence right after the fault appears and the fast recovery operation after the fault removes than that with the subtractive polarity winding.
변압기 권선을 이용한 자속구속형 초전도 전류제한기의 전류제한 및 전압강하 보상 특성
고석철,Ko, Seok-Cheol 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.12
The superconducting fault current limiter (SFCL) can quickly limit the fault current shortly after the short circuit occurs and recover the superconducting state after the fault removes and plays a role in compensating the voltage sag of the sound feeder adjacent to the fault feeder as well as the fault current limiting operation of the fault feeder. Especially, the flux-lock type SFCL with an isolated transformer, which consists of two parallel connected coils on an iron core and the isolated transformer connected in series with one of two coils, has different voltage sag compensating and current limiting characteristics due to the winding direction and the inductance ratio of two coils. The current limiting and the voltage sag compensating characteristics of a SFCL using a transformer winding were analyzed. Through the analysis on the short-circuit tests results considering the winding direction of two coils, the SFCL designed with the additive polarity winding has shown the higher limited fault current than the SFCL designed with the subtractive polarity winding. It could be confirmed that the higher fault current limitation of the SFCL could be contributed to the higher load voltage sag compensation.
건설용 철근 20~70Φ급 자동 철근 결속기의 설계·제작에 대한 고찰
고석철,Ko, Seok-Cheol 한국조명전기설비학회 2016 조명·전기설비학회논문지 Vol.30 No.4
In general, the method of supplying the wire of auto-binding apparatus for reinforcing bar used in construction sites are often poor and supplies by using the hall way, the head of the thick binder is often an obstacle for interference when bind the reinforcing bar. In this paper, we proposed a new auto-binding apparatus for reinforcing bar by improving the existing bond issues that they work for the common descriptor. The auto-binding apparatus for reinforcing bar is easy to carry because it is designed with a pistol grip shape. It also has the advantage to increase the productivity because it is easy binding of the reinforcing bar itself, rather than binding operation by a person. It was designed and produced by adding a multi-functional to automatically bond the reinforcing rod of $20{\sim}70{\Phi}$ range. We carried out the performance evaluation tests, such as binding strength, binding time, binding range, body weight, wire cutting unit wear, binding malfunction test in order to compare and validate domestic and foreign technical level of the performance of the developed auto-binding apparatus for reinforcing bar. As a result, it was confirmed that the development of each item is reached.
모의배전계통에 두 트리거 전류레벨을 이용한 초전도한류기의 전류제한 특성 분석
고석철,한태희,Ko, Seok-Cheol,Han, Tae-Hee 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.2
When the accident occurred in power distribution system, it needs to control efficiently the fault current according to the fault angle and location. The flux-lock type superconducting fault current limiters (SFCL) can quickly limit when the short circuit accidents occurred and be made the resistance after the fault current. The flux-lock type SFCL has a single triggering element, detects and limits the fault current at the same time regardless of the size of the fault current. However, it has a disadvantage that broken the superconductor element. If the flux-lock type SFCL has separated structure of the triggering element and the limiting element, when large fault current occurs, it can reduce the burden of power and control fault current to adjust impedance. In this paper, this system is composed by triggering element and limiting element to analyze operation of limiting current. When the fault current occurs, we analyzed the limiting and operating current characteristics of the two triggering current level, and the compensation characteristics of bus-voltage sag according to the fault angle and location.
지역산업 변화에 따른 청양군 제조업의 산업경쟁력 강화방안 고찰
고석철(Seok-Cheol Ko),신동호(Dong-Ho Shin),이상철(Sang-Cheol Lee),맹승렬(Seung-Ryol Maeng) 한국산학기술학회 2015 한국산학기술학회 학술대회 Vol.2015 No.1
본 논문에서 청양군의 제조업 업종 위주의 현황 및 변화 분석을 통하여 제조업산업의 경쟁력을 강화하고자 하였다. 또한, 지역주민 의식조사를 병행하여 지역산업분야의 문제점과 향후 육성방향을 설문조사하여 제조업산업 경쟁력 강화방안에 그 의견을 수렴하고자 하였다. 이에 전략업종 선정 및 진단을 통환 활성화 사업 추진, 미래 성장산업 발굴 및 육성을 위한 기반마련, 노후 농공단지의 활성화를 위한 현대화 추진, 산업클러스터 구성 및 기업 간 네트워킹 체계 운영 등의 세부실행방안을 제시하였다.