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한문섭(Moon-Seob Han),신효범(Hyo-Bum Shin),창상훈(Sang-Hoon Chang),김주락(Joo-Rak Kim),장동욱(Dong-Uk Jang) 대한전기학회 2012 대한전기학회 학술대회 논문집 Vol.2012 No.5
AC power supply system supplies power to railroad sections. In order to prevent collision of disordered power suppliers, neutral sections are constructed near the substations and sectioning posts. For these reasons, the study on automatic changeover system is in process. Also in order to verify the theory, field experiments on system constructed at Yongpo-ri SSP?which is included in Dae-bule pilot model railroad?is on the stage. In this paper, power transfer experiment results, which conducted by passing practical rolling stock(EL-8200s) through the neutral section where the power supplier is adopted, are presented. In order to measure the inrush current and abnormal phenomenon, the power transfer experiment had conducted with VCB switches and thyristor switches. Also in order to analyze the undergoing phenomenon affected by traction driving.
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.
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(M. S. Han),창상훈(S. H. Chang),신명철(M. C. Shin) 대한전기학회 2013 전기학회논문지 Vol.62 No.3
A neutral section is installed around feeding substation(SS) and sectioning post(SP) that M?phase and Tphase are isolated in AC feeding system. Electric Train under “Notch?OFF” is operated by inertia within the neutral section. It causes disturbing the operation of electric trains for speed drop and driver’s mistakes. A automatic changeover system with thyristor recently have taken under development. In the paper, it is introduced the configuration of train detection system and performance testing on automatic changeover system..
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.