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창상훈(Chang Sang-Hoon),김주락(Kim Joo-Rak),이형수(Lee Hyung-Soo),김정훈(Kim Jung-Hoon) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-
This study is carried out using a circuit model approach. First, the self and shunt impedances of all the conductors in the rail system and the mutual impedances between different conductors are computed. Then, a circuit representing the both rail systems at interfaces including the rails, feeders, protection wires, contact wires, ground wires is built. Auto-transformers in the system are also represented in the circuit model. The circuit model is then processed using a circuit solver based on a double-elimination method. Several different scenarios are analyzed, including the load conditions and a few fault conditions with different fault locations. The effect of the buried ground wires is also analyzed by comparing the results with and without the presence of the ground wires. The analysis procedure presented in the paper demonstrated an accurate way of computing fault current distribution and EMC at interfaces between both systems. The results presented in the paper can be used as a reference for estimating interference levels in similar rail systems.
VVVF 인버터로 구동되는 전기철도차량에서 방출되는 시변 저주파 전자계 분석
장동욱(Dong-Uk Jang),김주락(Joo-Rak Kim),김형철(Heol-Cheol Kim) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
This paper is described the analysis of time-varying low-frequency electric magnetic field emitted from electric rolling stocks fed by VVVF inverter, in reference to allowable magnitude for exposures to time-varying electromagnetic field issued by International Commission on Non-Ionizing Radiation Protection(ICNIRP). The level of the magnetic field strength was measured, in reference to the standard for occupational environments, which takes into account the public person's protection against the excessive emission of the low-frequency magnetic field, 5 ㎐ ~ 2 ㎑.
고속철 부하의 고조파 측정, 평가 및 시뮬레이션에 관한 연구
김경철(Kyung-Chul Kim),진성은(Seong-Eun Jin),이주홍(Joo-Hong Lee),이일무(Il-Moo Lee),김주락(Joo-Rak Kim) 한국조명·전기설비학회 2006 한국조명·전기설비학회 학술대회논문집 Vol.2006 No.5월
High speed electric trains have nonlinear loads including converters and inverters for the contol synchronous motors. Harmonic field measurements have shown that the harmonic contents of a waveform varies with time. Direct application of the harmonic assessment to the snapshot measurements would result in ambiguous conclusions depending on which instant is sampled. A cumulative probablistic approach is the most commonly used method to solve time varying harmonics. This paper provides an in depth analysis on harmonics field measurement of the high speed electric train loads, harmonics assessment by the international harmonic standards IEC 61000-3-6 and IEEE Std. 519-1992, and harmonics simulation using EDSA program for the case study.
장동욱(Jang Dong-Uk),김주락(Kim Joo-Rak),한문섭(Han Moon-Seob),이수길(Lee Soo-Gil) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
The inrush current of main transformer installed tiling train is analyzed during the operation of MCB (main circuit break) passing through the neutral section. The instantaneous waveform of load current were analyzed in case of powering and regenerative braking. Inrush current waveform with run of AC railway train showed that inrush current waveform and harmonics, the inrush current generated from main transformer in train has bad effects on power quality problem. In order to reduce these inrush currents, the MCB is connected when the phase angle of voltage is 90 degree. But this electric railway train does not equip this system and then generates various inrush waveform. In case of inrush current waveform with run of tilting train, and it is generated from main transformer in train has bad effects on power quality problem.
장동욱(Dong-Uk Jang),김형철(Heol-Cheol Kim),김주락(Joo-Rak Kim),정상용(Sang-Yong Jeong) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
철도차량이 고속으로 주행함에 따라서 접촉식으로 전력을 공급받는 방식의 한계가 발생하였다. 해외의 고속자기부상열차에서는 차상에 전력을 공급하기 위해서 비접촉방식을 이용하고 있다. 독일의 경우는 선형발전기와 유도급전시스템을 적용하였으며, 일본의 MLX01의 경우는 선형발전기를 이용하고 있다. 따라서 현재 진행중인 초고속 튜브열차의 차상전원을 공급에 적합한 전력공급방식을 해외사례를 통하여 검토하였다.