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냉동기 부착형 전도냉각식 Cryostat의 설계 및 제작
裵俊漢(Joon Han Bae),沈基德(Ki Deck Sim) 대한전기학회 2007 전기학회논문지 Vol.56 No.11
In order to measure the superconducting transition temperature, the critical current and the alternating current(AC) loss on short samples of high temperature superconductor, a cryocooler cooled cryostat has been designed and built. Two closed-cycle coolers provide cooling with an ultimate sample temperature below 16K. Temperature regulation is provided by 50W of electrical heater that opposes the cooling power from the cold heads. Temperature control feedback is by means of a cernox temperature sensor co-located with the heaters on the second stage of the cold head. Additional temperature sensors are located on the sample mount(B1), on the CVI cold head(B2) and on the Dakin cold head(B3). AC losses on the sample high temperature superconductor were measured at 30K so that the developed device performance was evaluated. In this paper, the design, fabrication and test results on the cryocooler cooled cryostat are presented.
전도냉각형 고온초전도 Wire의 전류도입부에서의 열적 퀜치
배준한,배덕권,박해용,손명환,성기철,Bae, Joon-Han,Bae, Duck-Kweon,Park, Hae-Yong,Shon, Myung-Hwan,Seong, Ki-Chul 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.7
The heat generation in the high-$T_c$ superconducting (HTS) wire is related with the cost efficiency and safe factor of HTS devices. This paper deals with the thermal quench at the conduction-cooled joint between HTS wire and copper terminals. The 3-D numerical simulation of thermal distributions in part of the copper terminals was implemented and the premature quench at copper block was observed through the test. The results will be helpful to design the conduction-cooled HTS magnets.
裵俊漢(Joon-Han Bae),成耆哲(Ki-Chul Seong) 대한전기학회 2007 전기학회논문지 Vol.56 No.6
We designed and manufactured a 1.8T high temperature superconducting (HTS) insert coil for a NMR magnet operated at 4.2 K. Suitable HTS superconductor and HTS coil were carefully designed and developed. We have selected multi-filamentary Bi2223 conductor fabricated by American Superconductor Corporation(AMSC). The selected conductor consists of Bi2223 filaments of 55, silver stabilizer and stainless steel reinforcement tapes. Therefore, it shows good hoop strength as well as compression tolerance. The conductor has a tape cross-section of 0.31㎜×4.8㎜. the Bi2223 conductor shows large anisotropy of critical current. The critical current of conductor in magnetic field parallel to the flat surface are much higher than that in magnetic field perpendicular, The HTS coil has an inner diameter of 78 ㎜, an outer diameter of 127 ㎜ and a coil length of 600 ㎜. In this paper, the detailed design, fabrication and test results on the HTS insert coil are presented.
전력기기용 Al/Cu 복합 부스바의 통전용량 설계 및 특성 평가
裵俊漢(Joon-Han Bae),金海寯(Hae-Joon Kim) 대한전기학회 2006 전기학회논문지 B Vol.55 No.12
This paper deals with the electric and thermal characteristics of the composite busbar composed of aluminum and copper. When AC current is flowing in Cu busbar used widely in conservative equipments like power cable, transformer, and switchgear & controlgear most current is concentrated on the surface of the busbar by the skin effect. Therefore, if the Cu region in the busbar having low current density is replaced with aluminum, we can largely reduce the product cost and weight of the busbar. To conform the performance of the composite busbar, we designed and fabricated a test Al/Cu composite busbar. Maximun temperature rise of the busbar was 35℃ when 1600 Arms of AC current was applied to the test composite busbar(120㎜×10㎜). Based on test results, we can expect to make the low-priced and light power equipments using the Al/Cu composite busbar.
裵俊漢(Joon-Han Bae),裵德權(Duck-Kweon Bea) 대한전기학회 2006 전기학회논문지A Vol.55 No.8
Copper is widely used in electric wire, cable, conductor in electric devices. As the demand for electric power is increasing rapidly, electric power devices are getting amazingly bigger and complicated. The using of light-weight conductor can reduce the size and making cost of the electric devices. In high-frequency application, Electric current in a conductor tends to shift to the surface of the conductor, resulting in an uneven current distribution in the inner conductor. In the extreme case the current may essentially concentrate in the "skin" of the inner conductor as a surface current. In high frequency application, therefore, inner area of copper conductor may replace with aluminum conductor, which reduces the weight of conductor. This 'paper describes the manufacture and evaluation of composite conductors made of copper and aluminum. The optimum extruding ratio was 16 at 300℃. The electrical resistance of manufactured composite bus bar was 57?Ω at DC and 49.5?Ω at 300㎐.