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양형석(H.S. Yang),김동락(D.L. Kim),손송호(S.H. Sohn),임지현(J.H. Lim),최하옥(H.O. Choi),최연석(Y.S. Choi),이병섭(B.S. Lee),정원묵(W.M. Jung),류희석(H.S. Ryoo),황시돌(S.D. Hwang) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
A system for the 3-phase 100-m HTS power cable with 22.9㎸/1.25㎄ has been tested at the KEPCO뭩 Gochang power testing center since 2006. The cooling system consists of a liquid nitrogen decompression cooing system with a cooling capacity of 3㎾ at 66K and a closed circulation system of subcooled liquid nitrogen. Heat loads of the KEPCO HTS power cable system for several electrical loads were measured for investigating long-term operating performance such as cooling capacity, heat load, AC loss, temperature stability of the system.
양형석(H.S. Yang),김동락(D.L. Kim),손송호(S.H. Sohn),임지현(J.H. Lim),최하옥(H.O. Choi),이병섭(B.S. Lee),최연석(Y.S. Choi),류희석(H.S. Ryoo),황시돌(S.D. Hwang) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
As a power transmission line supplying power to a densely populated city, the high temperature superconducting (HTS) cable is expected to one of the most effective cables with a compact size because of its high current density. The verification of HTS power cable system have been progressed by KEPRI. A cooling system for a 3-phase 100m HTS power cable with 22.9㎸/1.25㎄ was installed and tested at KEPCO’s Gochang power testing center in Korea. The system consists of a liquid nitrogen decompression cooling system with a cooling capacity of 3㎾ and a closed circulation system of subcooled liquid nitrogen. Several performance tests of the cable system with respect to the cooling such as cooling capacity, heat load and temperature stability, were performed at several temperatures. Thermal cycle test, cool-down to liquid nitrogen temperature and warm-up to room temperature, was also performed to investigate thermal cycle influences. The outline of the installed cooling system and performance test results are presented in this paper.
Current Transport Characteristics of 22.9 ㎸ High Temperature Superconducting Cable System
손송호(S. H. Sohn),임지현(J. H. Lim),류희석(H. S. Ryoo),양형석(H. S. Yang),최하옥(H. O. Choi),마용호(Y. H. Ma),김동락(D. L. Kim),류경우(K. W. Ryu),성태현(T. H. Sung),현옥배(O. B. Hyun),임성우(S. W. Lim),황시돌(S. D. Hwang) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.7(초록집)
양형석(H.S. Yang),김동락(D.L. Kim),손송호(S.H. Sohn),임지현(J.H. Lim),최연석(Y.S. Choi),황시돌(S.D. Hwang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The KEPCO HTS power cable system of 100 m, 22.9 ㎸, 1.25 ㎄ has been installed and tested at the KEPCO's Gochang power testing center in Korea since 2006. A liquid nitrogen decompression cooling system with a cooling capacity of 3 ㎾ at 66 K and a closed-circulation system of subcooled liquid nitrogen were employed for this purpose. Several cooling characteristic tests for the system, such as cooling capacity, electrical loading, heat load, ac loss and temperature stability, were performed under several different operation conditions. In this paper, we discuss about cooling characteristics of the system.
양형석(H.S. Yang),김동락(D.L. Kim),이병섭(B.S. Lee),최연석(Y.S. Choi),신필권(P.K. Shin),이대희(D.H. Lee),남욱원(U.W. Nam) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
We developed a space infrared cryogenic system (PSICS) for ground observation. The system is cooled down to below 80K by a stirling cryocooler in order to increase sensitivity and decrease background noise of IR sensor. From the previous thermal numerical analyses, we knew that the major heat leak is thermal radiation and the minimizing heat leak by radiation is the core technique in this system. The thermal design of the PSICS have been performed and presented at 2005 KSME conferences. In this paper, the results of the cooling test and thermal insulation effects of multi-layer insulation are discussed.
양형석(H.S. Yang),김동락(D.L. Kim),이병섭(B.S. Lee),정원묵(W.M. Jung),김건희(G.H. Kim),이대희(D.H. Lee),박수종(S.J. Pak) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
We designed a cryostat for cooling infrared (IR) sensor. The cryostat has an IR sensor inside a cold box which is cooled by a stirling cryocooler with refrigeration capacity of 500㎿ at 80K in a vacuum vessel. It is important to minimize heat leak for reducing background thermal noise. In order to design the cryostat of low heat leak and to estimate heat leak correctly, we did numerical analyses. This paper describes the design factors and the thermal analysis results of the cryostat.
불평형 부하에서의 초전도케이블 운전 및 냉각부하 특성에 관한 연구
손송호(S. H. Sohn),임지현(J. H. Lim),양형석(H. S. Yang),최하옥(H. O. Choi),마용호(Y. H. Ma),김동락(D. L. Kim),류희석(H. S. Ryoo),류경우(K. W. Ryu),황시돌(S. D. Hwang) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
Demonstrations to deploy high temperature superconducting (HTS) cable to the real gird are actively carried out throughout the world. Power utilities have an interest in the inherent advantage of the HTS cable system, and achieve the expected results from the series of verification test. To embody the reliability in the phenomenon occurred commonly in three-phase system, we simulate the load unbalance. A 22.9 ㎸ large scale HTS cable system with the specification of 100 m-long, 50 ㎹A capacity has been tested with up to 30% unbalance rate. To evaluate the effect of AC loss increase due to the unbalanced load, the cooling loads are measured by the calorimetry method. In this paper, the correlation between AC loss and load unbalance is described and investigated precisely.
전력설비용 초전도케이블 냉각시스템의 냉각용량 과부하 모의시험
손송호(S. H. Sohn),임지현(J. H. Lim),최하옥(H. O. Choi),양형석(H. S. Yang),전재홍(J. H. Cheon),김동락(D. L. Kim),성태현(T. S. Sung),황시돌(S. D. Hwang) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.11
초전도케이블의 기술적 경제적 타당성에 대한 논의가 계속 진행되고 있는 가운데 이를 검증하기 위한 실계통 시험이 미국, 중국 및 일본을 포함한 주요 선진국들에서 이루어지고 있다. [1] 대용량 송전 및 절연성능 측면에서 장점을 가지고 있는 초전도케이블이 실제 계통에서 적용한 예가 지금까지 많지 않은 이유는 막대한 초기투자 비용과 함께 신기술 도입에 따른 기술적 신뢰성 확보를 꼽을 수 있다. 특히 케이블 자체의 전기적 특성과 함께 냉각시스템의 신뢰성은 초전도케이블 기술의 상용화를 위해서 반드시 확보되어야 하며 냉각시스템 의 고효율와 함께 장기운전에 따른 냉각시스템의 안정성 및 기기적 특정들이 우선적으로 파악되어야 할 것이다. 본 논문에서는 냉각시스템의 신뢰성을 검증하기 위한 실험의 일환으로 전류와 냉각시스템에 내장되어 있는 히터를 이용하여 열부하를 동시에 인가, 냉각시스템의 냉각용량 과부하 상태를 모의하여 냉각시스템의 반응성을 평가하였다.
이대희,양형석,남욱원,이성호,진호,김동락,박수종,김병혁,박성제,Lee, D.H.,Yang, H.S.,Nam, U.W.,Lee, S.,Jin, H.,Kim, D.L.,Pak, S.,Kim, B.H.,Park, S.J. 한국천문학회 2006 天文學論叢 Vol.21 No.2
We have tested the performance of the Proto-model of Space Infrared Cryogenic System (PSICS), which is a small infrared camera, developed by Korea Astronomy and Space science Institute (KASI), Korea Basic Science Institute (KBSI), Korea Institute of Machinery and Materials (KIMM), and i3system co., as a cooperation project. The purpose of PSICS is to ensure a technology of small infrared cryogenic system for future development of space infrared (IR) cameras. PSICS consists of cryogenic part, IR sensor and electronics part, and optical part. The performance test of each part and the integrated system has been completed successfully. PSICS will be used as a guiding camera for ground-based IR telescopes and a test system for developing a space-borne instrument.