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김해준(Hae Joon Kim),심기덕(Ki Deok Sim),김재호(Jae Ho Kim),조전욱(Jeon Wook Cho) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Reduction of AC losses is very important for realizing HTS cable and it had been reported that the same layer current controlled by twisting pitch and direction could reduce the AC losses effectively. During the long-term development of HTS cables, the superconductor AC losses will need to be reduced to a level determined by the economics of each installation and the efficiency of the refrigeration. Theoretical models have been developed to predict the magnitude of the losses in cables composed of several layers of flat HTS tapes. This paper is manufactured mini-model HTS cable and voltage signal line to spiral shape. Mini-model HTS cable is composed of 13 HTS tape. We measured to critical current and AC loss and compared used lock-in-amp to cancel coil. This data is useful to HTS cable of DAPAS program.
孫明煥(Myung-Hwan Sohn),沈基德(Ki-Deok Sim),金錫鎬(Seokho Kim),金海鍾(Hae-Jong Kim),裵俊漢(Joon-Han Bae),李彦容(Eon-Young Lee),閔治顯(Chi-Hyun Min),成耆哲(Ki-Chul Seong) 대한전기학회 2006 전기학회논문지 B Vol.55 No.12
High temperature superconductor (HTS) winding coil is one of the key component in superconducting device fabrication. Double-pancake style coils are widely used for such application. High resistance between pancake coils greatly affects the machine design, operating condition and thus the stability. In order to reduce such resistance, experimentalists are looking for efficient and damage free coil connecting methods. In this respect, here we proposed parallel joining method to connect the coils. This is to do crossly joining with HTS tapes on two parallel HTS tapes. Joint samples between two parallel HTS tapes were prepared by using HTS tapes and current-voltage (Ⅰ-Ⅴ) characteristic curves were investigated at liquid nitrogen temperature i.e., 77.3 K. A 20 ㎝ length joint connected between two parallel HTS tapes shows 32.5 nΩ, for currents up to 250 A. A small HTS magnet, having two double pancake sub-coils connected together through new parallel joint method was fabricated and their current-voltage (Ⅰ-Ⅴ) characteristic curve was investigated. At 77.3K, critical current(lc) of 97 A and resistance of 55 nΩ for currents upto 130 A were measured. At operating current 86 A lower than Ic, Joule heats generated in whole magnet and at joint region between sub-coils were 226 ㎽ and 0.4 ㎽, respectively. Low Joule heat generation suggests that this joining method may be used to fabricate HTS magnet or windings.
초전도 전력기기의 계통적용을 위한 실시간 시뮬레이션 기법 개발 (PART 1 : 고온초전도 전력 케이블)
김재호,박민원,박대진,강진주,조전욱,심기덕,유인근,Kim, Jae-Ho,Park, Min-Won,Park, Dae-Jin,Kang, Jin-Ju,Cho, Jeon-Wook,Sim, Ki-Deok,Yu, In-Keun 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.11
High temperature superconducting(HTS) power cable is expected to be used for power transmission lines supplying electric power for densely populated cities in the near future. Since HTS power cable is capable of the high current density delivery with low power loss, the cable size can be compact comparing with the conventional cable whose capacity is same. In this paper, the authors propose the real time simulation method which puts a teal HTS wire into the simulated 22.9 kV utility grid system using Real Time Digital Simulator (RTDS). For the simulation analysis, test sample of HTS wire was actually manufactured. And the transient phenomenon of the HTS wire was analyzed in the simulated utility power grid. This simulation method is the world first trial in order to obtain much better data for installation of HTS power device into utility network.
손명환(Myung-Hwan Sohn),김석호(Seokho Kim),심기덕(Ki-deok Sim),배준한(Jun Han Bae),이석주(Seok-Ju Lee),엄범용(Beom-Yong Eom),박해용(Hae-Yong Park) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
초전도 시스템에서 전류를 공급하는 역할을 하는 전류리드는 없어서는 안 될 핵심 부품이다. Powder-in-tube(PIT) 법으로 제작한 1세대(1G) 고온초전도 선재보다 열전달특성이 나쁜 2세대(2G) 고온초전도 선재를 이용하여 고온초전도 전류리드를 제작하였다. 사용한 선재는 미국 AMSC사 선재이다. 초전도 자석으로의 열침입을 최소화하기 위해 지지구조물은 GFRP를 사용하였고 금속연결부는 무산소동을 사용하였다. 2G 선재 6가닥을 사용하여 제작한 전류리드는 액체질소 온도에서 I-V 특성을 평가한 결과 약 400 A급 전류리드도 사용 가능하다고 판단되었으며, 열전달 특성을 측정하기 위해 무냉매형 특성평가장치를 사용하였는데, 77 K과 7 K 사이에서 약 50 ㎽정도 였다. 본 논문에선 2G 고온초전도 선재를 사용하여 제작한 전류리드의 전기적 열적 특성에 대해 논의하고자 한다.
초고속 Maglev용 초전도 마그넷 요소 기술 및 국내 연구 개발 현황
이창영(Lee Chang-Young),강부병(Kang Bu-Byoung),한영재(Han Young-Jae),심기덕(Sim Ki-Deok),박동근(Park Dong-Keun),고태국(Ko Tae-Kuk) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
Ultra-speed tube train, which runs in vacuum atmosphere to overcome aero-dynamic dragging force, is considered as a high-speed ground transportation system to back up long-distance air travel. To realize the ultra-speed tube train, feasibility study of currently available Maglev technologies especially for propulsion and levitation system is needed. Propulsion by linear synchronous motor(LSM) and levitation by electro-dynamic suspension(EDS) which are utilized in the Japan's MLX system could be one of candidated technologies for ultra-speed tube train. In the LSM-EDS system, the key component is superconducting magnet, and its reliability and performance is very important to guarantee the safe-operation of Maglev. As the initiative of the feasibility study, this paper deals with the basic structure of superconducting magnet and core technologies to design and operate it. And by surveying the current R&D achievement in Korea, the nation's capability to develop advanced superconducting magnet for Maglev is presented.