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임지현(J. H. Lim),손송호(S. H. Sohn),황시돌(S. D. Hwang),양형석(H. S. Yang),김동락(D. L. Kim),류희석(H. S. Ryoo) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
High Temperature Superconducting (HTS) power cables are able to transfer large quantities of electricity with a small loss compared to common power cables. Therefore, many researches on HTS cable system have been carried out in several countries. Korea Electric Power Corporation (KEPCO) also initiated 22.9 ㎸, 50 MVA, 100 m class HTS cable project in Gochang test yard, located in Chonnbuk province. In order to maintain the characteristics of HTS cable reliably, cryogenic condition is essential for the system operation. Cryogenic system consists of gas/liquid separator, sub-cooler, heating unit, buffer tank, reservoir unit, and decompression pumps and liquid nitrogen is used as a coolant. The process of cooling system and some preliminary test results are presented in this paper.
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.
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.
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)
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.
마용호(Y.H. Ma),이주영(Z.Y. Li),진홍범(H.B. Jin),류경우(K. Ryu),임지현(J.H. Lim),손송호(S.H. Sohn),황시돌(S.D Hwang) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
다층구조의conductor와 shield로 구성되는 HTS-cable의 교류손실 특성 연구를 위하여 2005년부터 실증시험 중에 있는 22.9㎸, 50㎹A, 100m급 KEPCO HTS-cable system에 사용된 케이블과 동일한 두개의 short-sample에 대하여DC 및 AC 특성을 실험적으로 조사하였다. KEPCO HTS-cable system에서 처럼 shield전류를 conductor와 크기는 같게 하고 방향을 반대로하여 수주기동안 AC pulse전류를 인가했을 때, shield의 임계전류가 conductor보다 작음에도 불구하고 conductor-lead에 대하여 측정된 AC loss가 shield의 것과 비교하여 약 1.5배 큰 것을 알 수 있었다.
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.
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.