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심재석(Sim Jae-Suk),김윤식(Kim Yoon-Sik),이기승(Lee Gi-Seung) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
FRP(Fiber Reinforced Plastic) support insulators for DC(direct current) were developed and their electrical and mechanical characteristics were investigated. Electrical tests were carried out to measure flashover voltages under common use frequency condition. Tensile and bending tests were performed for the mechanical characteristics. The test results showed that FRP support insulators have superior voltage resistances and strengths to porcelain insulators. Field test also is carried out to measure adaptation and to compensate the defect. The test result showed that a new product has no defect in electrical and mechanical.
도시철도설비를 이용한 회생에너지 측정방법 연구 : 서울메트로 2호선 회생에너지 측정결과 분석
김윤식(Yoon-Sik Kim),심재석(Jae-Suk Sim),박영석(Young-Seok Park),이기승(Gi-Seung Lee) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
The study on using electric power-restoration is actively going on in the inside and outside of the country and domestic train's operators introduce this facility increasingly. Seoul Metro organizes 1944 trains into 199 groups and of these, 188 trains are capable of restoring electric power except 11 groups, so the trains affording to restore are charged of 95%. In the case of line No.2 Seoul Metro, train group is great deal of weight on VVVF and line No.3ㆍ4 train group is being changed into VVVF from the chopper control trains before. Therefore the interest of the electric power restoration is growing. To introduce power-restoration facility economic analysis of measuring restoration energy should be done. Until now the measurement about the amount of electric power restoration was done by other train operators which operate train in the long interval. So, we have measured restoration energy by using the railway faculties in line No.2 Seoul Metro which operates train in the shortest interval. This paper treats measurement method and the analysis of the result.
김윤식(Kim Youn-Sik),심재석(Sim Jae-Suk),이기승(Lee Gi-Seung) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
The LED illuminator has merits that it has low power consumption, long life and emits low Co2 gas. As it has many merits in comparison with existing illuminator it is a realistic alternative. but its possession in illuminator market shows slow increasement unexpectedly. Because its price is very high only low power consumption can not keep pace with economical efficiency. In this paper I analyzed economical efficiency about LED illuminator when it is applied at subway station.
김윤식(Kim Youn-Sik),이기승(Lee Gi-Seung),심재석(Sim Jae-Suk) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
The after 1974 capital region electric railroad is opened to traffic Koraill and Seoul metro adopt each other different power supply method and they operate and they are come. AC 25[kv] method voltage the insulation becomes larger standing distance highly, the case tunnel section which will introduce in the underground segment becomes on a large scale and the cost of construction increases to the city center and the underground segment adoption of DC method was many. To recent times with R-bar (Rigid-bar) introductions change of tunnel section the introduction of AC method came to be easy without in the underground segment. Operates sees in the electric protection where the Seoul metro and the Korail are different each other and, from the dead section segment the interior electric light to put out lights the passenger brings about inconveniently and the civil appeal which demands a power supply method unification occurs, within the company interchange electric railroad brazier safety improvement and maintenance expense curtailment etc. the flaw is original proposal, is a condition which finishes a feasibility study service about the power supply method fringe land. Interchange analysis of the DC electric railway it leads from the present paper and it compares under analyzing being it could be reflected to also the route which is in the process of actual using boil the strong point and a weak point of DC and AC method of the establishment route constructive at the time of and
이기승(Lee Gi-Sung),김윤식(Kim Yoon-Sik),심재석(Sim Jae-Suk),정호성(Jung Hosung),이기원(Lee Kiwon),조호령(Cho Horyung) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
The use of polymer insulator has increased all over the world. As of 2000's KEPCO has used it fully since they introduced it in early 1990's. In Korea it is very widely used by KORAIL which uses AC 25 kV system in the ground electric car line. And It is also used in tunnel electric car line to support AT feeder line. But it has not been used in the section of DC 1500 V. In case of DC 1500 V electric railway system It is has been developed by research institutes by means of R&D projects since 2008. The user cleans porcelain insulators regularly by water because of dusts and pollution. In case of polymer insulators It is very easy to be made dirty by pollution because of the material properties and hard to be cleaned by cleansing. In accordance with these reasons It is worried about deterioration. This paper deals with anticipating problems when we apply it to DC electric railway system and the procedure for testing polymer support insulator.
전기차 충전시스템을 위한 도시철도 DC 전력의 활용방안 연구
강현일(Kang Hyun-il),김윤식(Kim Youn-sik),심재석(Sim Jae-suk),임형길(Im Hyeong-gil),유기선(Ryu Ki-seon),이기승(Lee Gi-seung) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
Electric vehicles have reached a new level of development with introductions by Chrysler, Ford, Honda and Toyota. Today's charging technology includes conductive and inductive charging systems. There are three standardized charging levels: Level 1: charging can be done from a standard, grounded AC 120V, 3-prong outlet available in all homes Level 2: charging is at AC 240V, 40 amp charging station with special consumer features to make it easy and convenient to plug in and charge EVs at home or at an EV charging station Level 3: a high-powered charging "fast charge" technology currently under development that will provide a charge in less than 15 minutes. The incoming AC power is converted to DC and stored in the vehicle's batteries. In this paper, we investigated the application of urban railway DC electric power for electric car charging system.