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한문섭(Han Moonseob),김주락(Kim Ju-rak),정호성(Jung Ho-sung) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.4
DC feeding system is mainly floating but the rail potential and the leakage current are created because of long parallelism between rails and ground. Rail potential causes electric shock to human and leakage current causes electrolytic corrosion to nearby the buried metals. Therefore the design technologies to reduce, protect and monitor these effects are important recent DC feeding system. Rail potential and leakage current are analysed based on propagation theory that is utilized in order to simulate grounding system. New measurement procedure is proposed based on this analysis in order to more be accurate in result.
한문섭(Han Moonseob),김주락(Kim Ju-Rak),이장무(Lee Chang-Mu) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
This study examined EM compatibility between noise from electric railway and signal of ILS in the case that an AC double track system is located about 1㎞ far from end zone of runway at the airport. ILS is the most major equipment to help give airplane route during the landing.
직류 철도용 MOV 병렬연결 1,800V급 IGBT 직류 고속차단기 연구
한문섭(Moonseob Han),이장무(Chang-Mu Lee),김주락(Ju-Rak Kim),창상훈(Sang-Hoon Chang),김인동(In-Dong Kim) 대한전기학회 2016 전기학회논문지 Vol.65 No.12
The rate of rise of the fault current in DC grids is very high compared to AC grids because of the low line impedance of DC lines. In AC grids the arc of the circuit breaker under current interruption is extinguished by the zero current crossing which is provided naturally by the system. In DC grids the zero current crossing must be provided by the circuit breaker itself. Unlike AC girds, the magnetic energy of DC grids is stored in the system inductance. The DC circuit breaker must dissipate the stored energy. In addition the DC breaker must withstand the residual overvoltage after the current interruption. The main contents of this paper are to: . Explain the theoretical background for the design of DC circuit breaker. . Develop the simulation model in PSIM of the real scaled DC circuit breaker for 1,800V DC railway. . Suggest design guidelines for the DC circuit breaker based on the experimental work, simulations and design process.
한문섭(Moonseob Han),이장무(Chang-Mu Lee),김재원(Jae-Won Kim),창상훈(Sang-Hoon Chang) 대한전기학회 2018 전기학회논문지 Vol.67 No.1
The voltage drop is important in electric railway for feeding a huge power of train on fixed feeding area. Nowadays it is tried to operate a high speed trains on conventional lines and there is problem on the voltage drop too. It is simulated on the conditions increased the turn ratio of trolley, installed autotransformer neutral line with variable taps. In result, it is compensated the voltage drop between ATs and better on last AT, not on the position of AT. And it is decreased a return current and neutral current of AT because of unbalance between trolley and feeder. It should be studied faster and more controllable the solid state switchs instead of the mechanical one in order to utilize this system.
한문섭(Han Moonseob),김형철(Kim hyungchul),나재두(Na Jae-Du) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
D.C. traction systems can cause stray currents which could adversely affect both the railway concerned and outside installations, when the return circuit is not sufficiently insulated versus earth. As experience for several decades has not shown evident corrosion effects from a.c. traction systems and actual investigations are not completed, stary currents flowing from a d.c. traction system is issued. D.C. traction systems can cause stray currents can be corrosion and subsequent damage of metallic structures, where stray currents leave the metallic structures. There is also the risk of overheating, arcing and fire and subsequent danger to persons and equipment. Any provision employed to control the effects of stray currents be checked, verified and validated. Direct measurement of stray current is difficult and a provision employed to control the effects of stray currents is proposed.
직류급전시스템의 레일전위와 누설전류 관점에서의 설계 파라미터 연구
한문섭(Han Moonseob),정호성(Jung Ho-Sung) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
DC feeding system is mainly floating but the rail potential and the leakage current are created because of long parallelism between rails and ground. Rail potential causes electric shock to human and leakage current causes electrolytic corrosion to nearby the buried metals. Therefore the design technologies to reduce, protect and monitor these effects are important recent DC feeding system. Normally during designing DC feeding system in terms of rail potential and leakage current, there are about 10 parameters. Four design parameters among those is analysed based on propagation theory that is utilized in order to simulate grounding system.
전기철도 급전시스템의 주파수 기반모델을 이용한 고조파 해석
한문섭(Han Moonseob),이장무(Lee Jangmu),정호성(Jung Hosung),김주락(Kim Joorak) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Each feeding power is transformed 3 phases of KEPCO through SCOTT transformer and operate a electric train in AC Feeding system of electric railway. Nowaday a power conversion system, installed inside the train, generate a harmonics and has a effect on a power quality and it is necessary to install a countermeasures. This report is proposed a new technique to simulate a power system based on frequency model. The result is resonable relatively with a experimental one.