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초전도 한류기용 YBCO 박막 전류 Path Pattern 개발
이방욱,강성종,박권배,오일성,Lee B. W.,Kang J. S.,Park K. B.,Oh I. S. 한국초전도학회 2005 Progress in superconductivity Vol.6 No.2
In this study, electromagnetic analysis of current paths including meander pattern, spiral pattern, and bi-spiral pattern were performed and in order to verity the analysis results, experiments tests including quench test, and insulation tests were performed. In addition, bubble corner concepts were introduced to enhance insulation reliability. From our study, bi-spiral pattern of YBCO thin films were rather effective for quench and insulation than the other patterns. So this current path pattern was adopted for YBCO thin films in order to develop 6.6 kV resistive fault current limiters. Finally YBCO thin films were connected in series and parallel to enhance capacity, and the test results of current limiting characteristics of 6.6kV resistive SFCL were successful. The Progress in Superconductivity is published every six month and serves as a channel for publications on superconductivity and related topics. The author(s) are required to submit THREE copies of the manuscripts along with original figures directly to the Editor.
이방욱,박권배,강종성,김호민,오일성,심정욱,현옥배,Lee, B.W.,Park, K.B.,Kang, J.S.,Kim, H.M.,Oh, I.S.,Shim, J.W.,Hyun, O.B. 한국초전도학회 2006 Progress in superconductivity Vol.7 No.2
High critical current density, high n value, multiple faults endurances, and fast recovery characteristics of YBCO thin films are very attractive characteristics for developing resistive type superconducting fault current limiters. But due to the limited current and voltage ratings of one YBCO module, it is needed to construct series and parallel module connections for high capacity electric networks. Especially for distribution network, more than 30 units should be connected in series to meet voltage level. So in order to construct distribution-level superconducting fault current limiter, simultaneous quench in one YBCO thin films should be realized, and furthermore, quench should be occurred in all fault current limiting units equally to avoid local heating and failures. In this paper, we proposed optimum design of YBCO thin films for fault current limiting module and technical method using shunt resistor to achieve simultaneous quench between multi current limiting units. From the analytical and the experimental results, optimal current path and thickness of shunt material was determined for YBCO thin films and shunt resistor between modules was developed. Finally, 14 kV one phase resistive fault current limiter using multi YBCO thin films was constructed and it was possible to get satisfactory test results.
탄소중립을 위한 전기물성 · 응용부문회(C)의 전기산업발전 방향
이방욱(Lee, Bang-Wook),김강식(Kim, Kang-Sik),이세희(LEE, Se-Hee),구선근(Goo, Sun-Geun),배채윤(Bae, Chae-Yoon),이동준(Lee, Dong-Zoon),강형구(Kang, Hyoung-Ku),이찬주(Lee, Chan-Joo),이병성(Lee, Byung-Sung) 대한전기학회 2022 전기의 세계 Vol.71 No.11
대한전기학회 전기물성 · 응용부문회(C)의 탄소중립 TF에서는 탄소중립을 위한 주요 기술로 친환경/고효율 전력기기 분야와 자산관리 분야 기술을 선정하여 기술동향을 조사 · 분석하였다. 본 고에서는 해당 기술의 기술동향을 정리하고 부문회의 전문성에 기반한 핵심기술 개발방안을 제시한다.
덕트 내 오염물질 퇴적 방지를 위한 벽면유동 제어에 관한 해석적 연구
이방욱(Banguk Lee),이지근(Jeekeun Lee) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.5
Technologies for preventing contaminants deposition are a key issue in a modern duct system. When particulate matters deposit inside the exhaust pipes, which are widely used in the Urea-SCR system to reduce NOx emission from heavy duty diesel engines, many problems arise associated with increased flow resistance and corrosion. Therefore, the development of the urea deposition avoidance technologies is being treated as an important issue of the Urea-SCR system. An analytical study was carried out to investigate the effects of the wall flow around the mixer with the variation of the mixer housing surrounding and supporting the mixer, which is designed to increase the wall flow and then to reduce droplet deposition. The housing angles and the position of the mixer were changed:angles of 0°, 1° , 2° , and 3° , and mixer positions of 0 L, 0.5 L, and 1 L. The axial velocity distributions, maximum velocity, the half-width, and momentum distribution of the wall flow were investigated to examine the effect of the mixer-housing assembly geometry.
Urea-SCR 시스템 Urea-Salt 퇴적방지를 위한 믹서하우징 형상변화에 따른 유동제어에 관한 연구
이방욱(Banguk Lee),이지근(Jeekeun Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The Urea-SCR system commercialized shows a remarkable performance to reduce NOx emission in heavy duty diesel engines. However, Urea-water solution injected upstream a mixer, which is set up inside a exhaust pipe to promote exhaust gas-atomized droplet mixing, bumps up against the wall of a exhaust pipe as the droplets flowing downstream through the exhaust gas. The urea deposited on the wall of the exhaust pipe is changed into the Urea-salt, resulting in the decreased life-time of the SCR catalysts and the increased exhaust emission. For this reason, the development of the urea deposition avoidance technologies is being treated as an important issue of the Urea-SCR system. Analytical study was carried out to investigate the effects of the flow characteristics around the mixer with the variation of the mixer housing surrounding and supporting the mixer, which is designed to increase the wall flow and then to reduce droplet deposition. The flow characteristics was simulated by applying for K-e RNG model, and the vane angles and the position of the mixer were changed : Angle of 0°, 1°, 2°, 3°, and Mixer positions of 0Lh, 0.5Lh, 1Lh. Analytical results were verified by the experimental results using a Hot-wire anemometer system. The wall flow onto the exhaust pipe was improved with changing the angle of the mixer housing, and the wall flow improved more when the position of the mixer was on 0Lh.