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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 :
Volume & Issues
Volume 2, Issue 2 - Nov 2000
Volume 2, Issue 1 - May 2000
Selecting the target year
The effect of local heating on superconductivities in internal tin processed Nb
Ha, Dong-Woo ; Oh, Sang-Soo ; Ha, Hong-Soo ; Lee, Nam-Jin ; Kwon, Young-Kil ; Ryu, Kang-Sik ;
Progress in Superconductivity and Cryogenics, volume 2, issue 2, 2000, Pages 1~5
There is the possibility that internal tin processed Nb
wires are locally heated during the drawing process and the jacketing process. It is important to know the variations in J
of internal tin processed Nb
wires caused by local heating. Internal tin processed Nb
rods were cold worked to 2.28 mm, using the appropriate reduction ratio, and then cut into several pieces. At this stage, wires were locally 50 mm heat zone heated up to 360
. The locally heated Nb
wires were drawn to a final diameter size of 0.81 mm. Others were cold worked successively to 0.81 mm and locally heated with the same conditions. 2 types of locally heat treated wires were wound on Ti-6Al-4V barrels and heat treated for the Nb
reaction. Local heating of internal tin processed Nb
wires after the J
of these wires. However, local heating at an intermediate stage of the drawing process caused a decrease in J
. When the local heating temperatures were higher than melting point of Sn, non-Cu J
's decreased significantly. A Sn-Cu alloyed boundary appeared after local heating over the melting point of Sn, and caused work hardening and a decrease in the workability.
Design of HTS Current Lead for SMES Magnet
Jang, Hyeon-Man ; O, Sang-Su ; Jo, Jeon-Uk ; Jo, Yeong-Sik ; Ha, Hong-Su ; Ha, Dong-U ; Seong, Gi-Cheol ; Gwon, Yeong-Gil ; Ryu, Gang-Sik ; Kim, Sang-Hyeon ;
Progress in Superconductivity and Cryogenics, volume 2, issue 2, 2000, Pages 6~10
1.5 kA class HTS current leads for a SMES magnet, which are connected to a conventional vapor cooled copper leads, were designed. The HTS leads are composed of Bi-2223/Ag-Au tapes and a stainless stell tube. The estimated critical current of the lead is about 1.6 kA at 77.3 K and in a self magnetic field, and the heat input to the liquid helium from the cold end of the 35 cm lead is 0.4 W/lead. It has been made clear that the heat input decreases with increase of the lead length and decrease of the warm end temperature and Ag-Au/SC ratio.
Generated heat decrease of thin film superconducting fault current limiter using diodes
Choi, Hyo-Sang ; Hyun, Ok-Bae ; Kim, Hye-Rim ; Hwang, Si-Dole ;
Progress in Superconductivity and Cryogenics, volume 2, issue 2, 2000, Pages 11~14
We fabricated a resistive superconducting fault current limiter (SFCL) of meander type based on a YBCO film. In order to disperse the heat generated at hot spots in the YBCO film the film was coated with a gold shunt layer. When diodes were inserted in the parallel circuit to restrict the temperature increase in the SFCL element by reducing power supply cycles, the voltage could be increased to
times with the same quench resistance at a half and full cycles.
Stability Analysis ofn HTS Current Lead with Constant Safety Factor
Seol, Seoung-Yun ;
Progress in Superconductivity and Cryogenics, volume 2, issue 2, 2000, Pages 15~19
The stability of variable cross-sectional area HTS current lead is considered. The cross-sectional area is varied to have a constant safety factor which is defined as the ratio of operating current and critical current of superconductor. As the constant area HTS lead, the variable cross-sectional area HTS lead also has three steady states above the bifurcation point and only one steady state below the bifurcation point. The temperature profiles and current sharing ratios for each steady state are calculated. The heat dissipation into cryogenic system for super-conducting, intermediate, and upper states are compared. For Bi-2333 sheathed with silver-gold alloy 2m length of current lead, and the maximum temperature of upper state seems to be burn-out free below 5m length.
Analysis of the stresses induced by magnetic field and cooling in the CICC type superconducting bus-line
Lee, Ho-Jin ; Nam, Hyeon-Il ; Kim, Gi-Baek ; Hong, Gye-Won ;
Progress in Superconductivity and Cryogenics, volume 2, issue 2, 2000, Pages 20~25
A CICC type superconducting bus-line electrically connecting a superconducting magnet to a power supply is cooled down to low temperature under the external magnetic field during operation. The thermal contraction during the cooling may be constrained by the supports which are installed to protect the bus-line from Lorenz magnetic forces. This constrained contraction causes thermal stresses in the bus-line to release thermal contraction. The minimum stress conditions in the bus-line may be optimized by controlling the supporting arrangement considering the thermal contraction and the external field. The analytical method to find optimal supports arrangement was suggested by using the beam theory, and numerical calculation using commercial code was performed to verify the suggested analytical optimization method.
Transient Characteristic Analysis of Quick Response Extraction Type Superconducting Generator by Finite Element Method
Kim, Jeong-Cheol ; Hahn, Sung-Chin ;
Progress in Superconductivity and Cryogenics, volume 2, issue 2, 2000, Pages 26~31
This paper deals with finite element analysis of 2GVA superconducting generator which has slitted electrothermal shield in d-axis (SES). Three phase fault is considered torque of the S.C.G. Using the result, generator parameters are calculated by F.E.M. The results are compared with superconducting generator having conventional electrothermal shield (CES). The result shows that quick response excitation could be applied to superconducting generator with slitted electrothermal shield.
A Study on the Application Effects of HTS Power Cable
Seong, Gi-Cheol ; Jo, Jeon-Uk ; Kim, Hae-Jong ; Gwon, Yeong-Gil ; Choe, Sang-Bong ; Ryu, Gang-Sik ; Kim, Bong-Tae ; Yu, In-Geun ;
Progress in Superconductivity and Cryogenics, volume 2, issue 2, 2000, Pages 32~36
In this study, we performed the long-term expansion planning for the conceptual design of HTS power cable in Seoul area. In Korea, underground power cable has been required gradually with increasing demand of electric power transmission density and low loss characteristics in the comparison with a conventional power cables, so we assumed that the HTS power cable is applied between the downtown area and the outskirts of the city for the large power transmission capacity. This paper is to show the effects of HTS power cables in Seoul based on the power system analysis.
Development and Characteristic Analysis of a 10kVA HTS Power Transformer
Lee, Hui-Jun ; Cha, Gwi-Su ; Lee, Ji-Gwang ; Choe, Gyeong-Dal ; Ryu, Gyeong-U ; Han, Song-Yeop ;
Progress in Superconductivity and Cryogenics, volume 2, issue 2, 2000, Pages 37~43
This paper describes the construction and test results of a 10kVA single phase HTS transformer. Double pancake windings with BSCCO-2223 HTS tape and G10-FRP cryostat with room temperature bore are used in the transformer. Two double pancake windings are connected in series to provide 188 turns and other two double pancake windings are connected in parallel to conduct the secondary current of 45.4[A]. Coefficients of the constructed transformer are obtained using the fundamental teats of the transformer. According to the test results, larger leakage reactance than expected is observed due to the bulky core which surrounds the sryostat.
Performance Evaluation of the HTS Bulk type Motor
Sim, Jung-Wook ; Lim, Hyoung-Woo ; Cha, Guee-Soo ;
Progress in Superconductivity and Cryogenics, volume 2, issue 2, 2000, Pages 44~48
The high temperature superconducting bulk can be used as the rotor of an ac motor. This paper presents the fabrication and test results of a ac motor with HTS bulk rotor. The rotor of a conventional squirrel cage induction motor was replaced with cylinder type YBCO bulk. Height and outer diameter of the HTS bulk was 15mm and 46mm, respectively. Eddy current brake using aluminium disk was used to measure the torque of the HTS motor. No load test, locked rotor test and load test were performed to examine the characteristics of the HTS motor. Test results show the motor can rotate at synchronous speed without any special starting circuit. Maximum output power of the constructed HTS motor was 408W.