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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Progress in Superconductivity and Cryogenics
Journal Basic Information
Journal DOI :
The Korea Institute of Applied Superconductivity and Cryogenics
Editor in Chief :
Hyung-Seop Shin, Won-Nam Kang
Volume & Issues
Volume 13, Issue 4 - Nov 2011
Volume 13, Issue 3 - Sep 2011
Volume 13, Issue 2 - May 2011
Volume 13, Issue 1 - Mar 2011
Selecting the target year
Design of Prototype Superconducting Hybrid Electromagnet for High Speed Maglev
Lee, Chang-Young ; Kang, Bu-Byoung ; Jo, Jung-Min ; Han, Young-Jae ; Chu, Sung-Yul ; Hwang, Young-Jin ; Jo, Hyun-Chul ; Jang, Jea-Young ; Ko, Tae-Kuk ;
Progress in Superconductivity and Cryogenics, volume 13, issue 3, 2011, Pages 1~4
DOI : 10.9714/psac.2011.13.3.001
This paper deals with the design and fabrication of prototype superconducting hybrid electromagnet(SH-EM) for EMS (Electromagnetic suspension)-based Maglev. The design requirements are based on the normal conducting EM used in the German high-speed Maglev. From the MMF-Levitation force curves simulated by FEM analysis, the required MMF by superconducting coil is suggested. As an experimental test setup to demonstrate the SH-EM, the experimental SH-EM with HTS coil cooled in
is fabricated. From the expected operating current of the HTS coil, the levitation performance of the SH-EM is estimated.
Dielectric Breakdown Characteristics of PPLP and GFRP for HTS DC Cable System
Kim, S.H. ; Choi, J.H. ; Kim, W.J. ; Jang, H.M. ; Lee, S.K. ;
Progress in Superconductivity and Cryogenics, volume 13, issue 3, 2011, Pages 5~9
DOI : 10.9714/psac.2011.13.3.005
DC high-temperature superconducting(HTS) cable system has attracted a great deal of interest from the view point of low loss, dense structure and large capacity. A HTS cable system is made of cable and termination. The insulating materials and insulation technology must be solved for the long life, reliability and compact of cable system. In this paper, we will report on the dielectric breakdown characteristics of insulating materials for HTS cable and termination. The AC, DC and lightning impulse breakdown strength of laminated polypropylene paper(PPLP) and glass fiber reinforced plastic(GFRP) have been measured under nitrogen pressures in the range of 0.l-0.4MPa. PPLP and GFRP are found to have a significantly higher DC breakdown strength. Also, DC surface flashover voltage of negative polarity is slightly higher than that of positive polarity in GFRP.
Experimental Study on the High Temperature Superconductor for Investigated Design Factors of Distribution and Transmission Level Resistive Type Superconductor Fault Current Limiter
Na, Jin-Bae ; Jang, Jae-Young ; Jo, Hyoun-Chul ; Hwang, Young-Jin ; Ko, Tae-Kuk ;
Progress in Superconductivity and Cryogenics, volume 13, issue 3, 2011, Pages 10~13
DOI : 10.9714/psac.2011.13.3.010
The power demand is steadily increasing due to rapidly develop of industrial field. The ratio of prospected increment of power consumption is over 2.2 % per year from 2007 to 2020 year. The superconducting fault current limiters(SFCLs) should be suggested to be one of promising machines to protect power grid. Four basis tests such as resistivity, short-circuit tests, ac losses and recovery time were investigated according to various reached maximum temperature, operating temperature. This paper deals with investigation of the various commercial high temperature superconductor for applying resistive type SFCLs.
Design Method for HTS Wire Length of the Small Scale Resistive Type Superconducting Fault Current Limiter Considering System Resistance
Lee, W.S. ; Choi, S.J. ; Jang, J.Y. ; Hwang, Y.J. ; Kang, J.S. ; Yang, D.G. ; Lee, H.G. ; Ko, T.K. ;
Progress in Superconductivity and Cryogenics, volume 13, issue 3, 2011, Pages 14~18
DOI : 10.9714/psac.2011.13.3.014
Electrical system is changing to smart grid which includes the distributed generations with reusable energy sources in these days. The distributed generations are environmentally friendly and have no concern with depletion problem. But dispatching distributed generations can cause an increase of the fault current. Resistive type super conducting fault current limiter is one of the candidates of solution for the large fault problem in smart grid. In this paper, a design method for the wire length of fault current limiter and the result of short circuit test for small scale modules considering system resistance are introduced.
Harmonics based loss characteristics analysis of HTS DC power cable
Kim, S.K. ; Kim, S.H. ; Park, M.W. ; Yu, I.K. ; Lee, S.J. ; Cho, J.W. ; Sim, K.D. ; Won, Y.J. ; Hwang, S.D. ;
Progress in Superconductivity and Cryogenics, volume 13, issue 3, 2011, Pages 19~23
DOI : 10.9714/psac.2011.13.3.019
An HTS DC power cable is expected to perfectly eliminate transmission loss caused by resistance. However, when the HTS DC power cable is applied to the power system, loss of the HTS DC power cable is generated due to harmonics caused by HVDC converter. We designed and analyzed the HTS DC power cable with a critical current of 1 kA to investigate the loss characteristics using a finite element method package. In this paper, the loss characteristics caused by harmonics in the HTS DC power cable were analyzed according to order and magnitude of harmonics. Based on the analysis results, the critical current of HTS DC power cable considered with the rated current could be determined to minimize the capacity of cooling system for the design the HTS DC power cable.
A Study on the Quench Initiation and Propagation Characteristics in GdBCO Racetrack Pancake Coil for Large-Scale Rotating Machines
Yang, D.G. ; Song, J.B. ; Kim, K.L. ; Kwon, O.J. ; Lee, W.S. ; Ko, T.K. ; Lee, H.G. ;
Progress in Superconductivity and Cryogenics, volume 13, issue 3, 2011, Pages 24~30
DOI : 10.9714/psac.2011.13.3.024
The stability issue of high temperature superconducting (HTS) racetrack coils is one of the most important factors for the development of large-scale rotating machines, such as ship propulsion motors and power generators. However, The stability and normal zone propagation characteristics of HTS racetrack pancake (RP) coils are not sufficient yet. In this study, quench tests for a GdBCO racetrack pancake coil were carried out under the condition of
at 77 K. Minimum quench energy and two-dimensional normal zone propagation velocities of the coil are also discussed. Normal zone propagation velocity in the coil's curved section is faster than in its straight section due to stress effects. The test results show that the protection of the straight section is of greater importance than that of the curved section when GdBCO racetrack pancake coils are applied to large-scale rotating machines.
Experimental study on GM-type pulse tube refrigerator with neon as working fluid
Kim, Hyo-Bong ; Park, Jong-Ho ;
Progress in Superconductivity and Cryogenics, volume 13, issue 3, 2011, Pages 31~35
DOI : 10.9714/psac.2011.13.3.031
This paper describes experimental study on GM-type pulse tube refrigerator with neon as a working fluid instead of helium. Neon gas has similar compression characteristics with helium gas because it is a monoatoimc gas. In experiments, a cooling performance test was performed with same compressor and pulse tube refrigerator for neon and helium as working gas. From experimental results, a PTR with neon show the improved cooling performance than a PTR with helium. Cooling performance and operating characteristics of a PTR were discussed and compared for two different working gas.
Cooling performance test of neon refrigeration system using commercial helium compressor
Ko, Jun-Seok ; Kim, Hyo-Bong ; Yeom, Han-Kil ; Hong, Yong-Ju ; Park, Seong-Je ; Lee, Kong-Hoon ;
Progress in Superconductivity and Cryogenics, volume 13, issue 3, 2011, Pages 36~41
DOI : 10.9714/psac.2011.13.3.036
This paper describes experimental investigation on neon refrigeration system using commercial helium compressor. In this paper, neon refrigeration cycle is calculated with assumption of ideal heat exchanger. From analysis, 32.6 K of the lowest temperature and 0.945 of quality after expansion are predicted. Cryogenic heat exchangers for pre cooler and main heat exchanger are designed and fabricated with configuration of tube-in-tube heat exchanger. In experiments, cooling performance test are performed as variation of charging pressure and orifice hole diameter. From experimental results, the lowest temperature of 44.0 K was measured with 500
orifice and 1500 kPa of charging pressure.