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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 17, Issue 4 - Dec 2015
Volume 17, Issue 3 - Sep 2015
Volume 17, Issue 2 - Jun 2015
Volume 17, Issue 1 - Mar 2015
Selecting the target year
The progresses of superconducting technology for power grid last decade in China
Xiao, Liye ; Gu, Hongwei ;
Progress in Superconductivity and Cryogenics, volume 17, issue 1, 2015, Pages 1~5
DOI : 10.9714/psac.2015.17.1.001
With the increasing development of renewable energy, it is expected that large-scale renewable power would be transported from the west and north area of China to the east and south area. For this reason, it will be necessary to develop a wide-area power grid in which the renewable energy would be the dominant power source, and the power grid will be faced by some critical challenges such as long-distance large-capacity power transmission, the stability of the wide-area power grid and the land use problem for the power grid. The superconducting technology for power (STP) would be a possible alternative for the development of China's future power grid. In last decade, STP has been extensively developed in China. In this paper, we present an overview of the R&D of STP last decade in China including: 1) the development of high temperature superconducting (HTS) materials, 2) DC power cables, 3) superconducting power substations, 4) fault current limiters and 5) superconducting magnetic energy storage (SMES).
Angular distributions of the critical current of ReBCO coated conductors in magnetic field up to 5T
Mineev, Nikolay A. ; Rudnev, Igor A. ;
Progress in Superconductivity and Cryogenics, volume 17, issue 1, 2015, Pages 6~9
DOI : 10.9714/psac.2015.17.1.006
For many applications of
(ReBCO) tapes it is needed to know the anisotropic properties of the used conductor in a broad range of magnetic field. In this paper we present the results of transport measurements on the SuNAM tape (GdBaCuO) with the rotation of the sample in magnetic fields up to 5 T in liquid nitrogen. The critical current over the magnetic field orientation (
) curves demonstrate the appearance of distinct second peak around c-axis in low fields. This peak almost vanishes in the fields over 3 T. The evolution of the ab-peak form is also presented: the peak consistently reduces its height with the magnetic field going up and in the high fields the shoulders rise, changing the type of the distribution. To describe experimental curves the vortex path model was applied to the angular distributions of the critical current in magnetic field. Good agreements of the experimental data with the analytical expressions were obtained that confirm the vortex path model approach.
Heat transfer monitoring between quenched high-temperature superconducting coated conductors and liquid nitrogen
Rubeli, Thomas ; Colangelo, Daniele ; Dutoit, Bertrand ; Vojenciak, Michal ;
Progress in Superconductivity and Cryogenics, volume 17, issue 1, 2015, Pages 10~13
DOI : 10.9714/psac.2015.17.1.010
High-temperature superconducting coated conductors (HTS-CCs) are good candidates for resistive superconducting fault current limiter (RSFCL) applications. However, the high current density they can carry and their low thermal diffusivity expose them to the risk of thermal instability. In order to find the best compromise between stability and cost, it is important to study the heat transfer between HTS-CCs and the liquid nitrogen (
) bath. This paper presents an experimental method to monitor in real-time the temperature of a quenched HTS-CC during a current pulse. The current and the associated voltage are measured, giving a precise knowledge of the amount of energy dissipated in the tape. These values are compared with an adiabatic numerical thermal model which takes into account heat capacity temperature dependence of the stabilizer and substrate. The result is a precise estimation of the heat transfer to the liquid nitrogen bath at each time step. Measurements were taken on a bare tape and have been repeated using increasing
insulation layers. The different heat exchange regimes can be clearly identified. This experimental method enables us to characterize the recooling process after a quench. Finally, suggestions are done to reduce the temperature increase of the tape, at a rated current and given limitation time, using different thermal insulation thicknesses.
Levitation characteristics of HTS tape stacks
Pokrovskiy, S.V. ; Ermolaev, Y.S. ; Rudnev, I.A. ;
Progress in Superconductivity and Cryogenics, volume 17, issue 1, 2015, Pages 14~16
DOI : 10.9714/psac.2015.17.1.014
Due to the considerable development of the technology of second generation high-temperature superconductors and a significant improvement in their mechanical and transport properties in the last few years it is possible to use HTS tapes in the magnetic levitation systems. The advantages of tapes on a metal substrate as compared with bulk YBCO material primarily in the strength, and the possibility of optimizing the convenience of manufacturing elements of levitation systems. In the present report presents the results of the magnetic levitation force measurements between the stack of HTS tapes containing
and NdFeB permanent magnet in the FC and ZFC regimes. It was found a non- linear dependence of the levitation force from the height of the array of stack in both modes: linear growth at small thickness gives way to flattening and constant at large number of tapes in the stack. Established that the levitation force of stacks comparable to that of bulk samples. The numerical calculations using finite element method showed that without the screening of the applied field the levitation force of the bulk superconductor and the layered superconductor stack with a critical current of tapes increased by the filling factor is exactly the same, and taking into account the screening force slightly different.
Residual magnetic field profiles and their current density profiles of coated conductors for fast and slow cut-off current operations
Sun, J. ; Tallouli, M. ; Shyshkin, O. ; Hamabe, M. ; Watanabe, H. ; Chikumoto, N. ; Yamaguchi, S. ;
Progress in Superconductivity and Cryogenics, volume 17, issue 1, 2015, Pages 17~20
DOI : 10.9714/psac.2015.17.1.017
Coated conductor is an important candidate for power cable applications due to its high current density. Even for DC power cable transmission, we must study the transport properties of HTS tapes after slow and fast discharge. In order to evaluate relation of the magnetic field with applied current we developed a scanning magnetic field measurements system by employing a Hall probe. This work presents the measurements of the magnetic fields above a coated conductor by varying applied current pattern. In the work, a transport current of 100 A, less than the critical current, is applied to YBCO coated conductor. We measured the residual magnetic field distributions after cut off the transport current with slow and fast operations. The results show differences of the magnetic field profiles and the corresponding current profiles by an inverse solution from the magnetic field measurement between these two operations because of the hysteresis of coated conductor excited by the transport current.
Magnetization of the stack of HTS tapes
Osipov, M.A. ; Abin, D.A. ; Pokrovskiy, S.V. ; Mineev, N.A. ; Rudnev, I.A. ;
Progress in Superconductivity and Cryogenics, volume 17, issue 1, 2015, Pages 21~24
DOI : 10.9714/psac.2015.17.1.021
New results of dependence of magnetic field, trapped by a stack of HTS tapes, on amount of tapes in a stack are reported. Commercial GdBCO tape 12 mm width and without Cu layer was used for the research. Tape was divided in square pieces
from which stacks were formed. Filling factor of the tape was about 1.4%. Measurements were carried out for stacks with height from 5 to 250 pieces and at wide temperature range from liquid helium to liquid nitrogen. Both FC (field cooling) and ZFC (zero field cooling) cooling methods were used in the research. These two methods show matching results with good accuracy. As a result dependences of trapped magnetic flux on amount of tapes for different temperatures were received. Research shows, that with increasing height of the stack trapped magnetic field value reach saturation at about 60 tapes in a stack for low temperatures. From 60 to 100 tapes increase of magnet flux is only 5%. Thus increase amount of tapes in a stack is not profitable. Also investigation of trapped magnet field relaxation was carried out. Relaxation speed decreases with increasing amount of elements. It means that the higher the stack is, the longer trapped flux will be held in cause of the same temperature.
Investigation of soldered low-resistance joints for coated conductors
Balashov, N.N. ; Degtyarenko, P.N. ; Ivanov, S.S. ;
Progress in Superconductivity and Cryogenics, volume 17, issue 1, 2015, Pages 25~27
DOI : 10.9714/psac.2015.17.1.025
The experimental investigation of resistance and thermal impacts stability of coated conductor joints has been carried out. We measured resistances of solder layers with the thicknesses ca. 10, 20, 30 and
and additionally studied their stability against thermal impacts. The obtained results show a high quality of this joints and their applicability, e.g., for design of current leads in various superconductive energy applications.
Superconducting magnet system of in-flight separator for a heavy ion accelerator planned in Korea
Kim, J.W. ; Kim, D.G. ; Jo, H.C. ; Choi, Y.S. ; Kim, S.H. ; Sim, K.D. ; Sohn, M.H. ;
Progress in Superconductivity and Cryogenics, volume 17, issue 1, 2015, Pages 28~31
DOI : 10.9714/psac.2015.17.1.028
An in-flight fragment separator, which aims to produce and study rare isotopes, consists of superferric quadrupole triplets and
dipole magnets to focus and bend the beams for achromatic focusing and momentum dispersion, respectively. The separator is divided into pre and main stages, and we plan to use superconducting magnets employing high-Tc superconductor (HTS) coils in the pre-separator area, where radiation heating is high. The HTS coils will be cooled by cold He gas in 20-50 K, and in the other area, superferric magnets using low-temperature superconductor (LTS) will be used at 4 K. A few LTS coils were wound and successfully tested in a LHe dewar, and the design of cryostat has been optimized. Development of the HTS coils is ongoing in collaboration with a group at KERI. An HTS coil of racetrack shape was wound and tested in a
bath and in a dewar with cryocooler. No degradation on critical current due to coil winding was found.
Operational characteristics analysis of a 8 mH class HTS DC reactor for an LCC type HVDC system
Kim, S.K. ; Go, B.S. ; Dinh, M.C. ; Kim, J.H. ; Park, M. ; Yu, I.K. ;
Progress in Superconductivity and Cryogenics, volume 17, issue 1, 2015, Pages 32~35
DOI : 10.9714/psac.2015.17.1.032
Many kinds of high temperature superconducting (HTS) devices are being developed due to its several advantages. In particular, the advantages of HTS devices are maximized under the DC condition. A line commutated converter (LCC) type high voltage direct current (HVDC) transmission system requires large capacity of DC reactors to protect the converters from faults. However, conventional DC reactor made of copper causes a lot of electrical losses. Thus, it is being attempted to apply the HTS DC reactor to an HVDC transmission system. The authors have developed a 8 mH class HTS DC reactor and a model-sized LCC type HVDC system. The HTS DC reactor was operated to analyze its operational characteristics in connection with the HVDC system. The voltage at both ends of the HTS DC reactor was measured to investigate the stability of the reactor. The voltages and currents at the AC and DC side of the system were measured to confirm the influence of the HTS DC reactor on the system. Two 5 mH copper DC reactors were connected to the HVDC system and investigated to compare the operational characteristics. In this paper, the operational characteristics of the HVDC system with the HTS DC reactor according to firing angle are described. The voltage and current characteristics of the system according to the types of DC reactors and harmonic characteristics are analyzed. Through the results, the applicability of an HTS DC reactor in an HVDC system is confirmed.
Characteristic of wireless power transmission S-Parameter for a superconductor coil
Jeong, In-Sung ; Jung, Byung-Ik ; Choi, Hyo-Sang ;
Progress in Superconductivity and Cryogenics, volume 17, issue 1, 2015, Pages 36~39
DOI : 10.9714/psac.2015.17.1.036
Many studies are being conducted to implement wireless charging, for example, for cellular phones or electronic tooth brushes, via wireless power transmission technique. However, the magnetic induction method had a very short transmission distance. To solve this problem, the team of Professor Marin Soljacic proposed a magnetic resonance system that used two resonance coils with the same resonance frequency. It had an approximately 40% efficiency at a 2m distance. The system improved the low efficiency and short distance problems of the existing systems. So it could also widen the application range of wireless power transmission. Many studies on the subject are underway. In this paper, the superconductor coil was used to improve the efficiency of magnetic resonance wireless power transmission. The resonance wireless power transmission system had a source coil, a load coil, and resonance coils (a transmitter and a receiver). The efficiency and distance depended on the characteristics of the transmitter and receiver coils that had the same resonance frequency. Therefore, two resonance coils were fabricated by superconductors. The current density of the superconductor was higher than that of the normal conductor coil. Accordingly, it had a high quality-factor and improved efficiency.
Characteristics simulation of wireless power transfer system considering shielding distance
Lee, Yu-Kyeong ; Choi, Hyo-Sang ; Jung, Byung Ik ; Jeong, In-Sung ;
Progress in Superconductivity and Cryogenics, volume 17, issue 1, 2015, Pages 40~43
DOI : 10.9714/psac.2015.17.1.040
Wireless power transfer technology is using the magnetic resonance recently drawing increased attention. It uses the resonance between transmitter and receiver coils to transfer power. Thus, it can improve the transfer distance and efficiency compared with the existing magnetic induction technique. The authors found from the previous study that the application of the superconductor coil to the magnetic resonance wireless power transfer system improved its efficiency. Its application to real life, however, requires the additional study on the effects of adjacent materials. In this study, the two resonance coils made by superconductor coils were used to aluminum and plastic shielding materials was placed between the coils. S-parameters were analyzed according to the position of the shielding material between the transmitter and receiver coils. As a result, the plastic of shielding material had no effect, but the aluminum of shielding material affected the wireless power transfer due to the shielding effectiveness.
A study on the barrier effect with respect to the condition of solid insulation materials in GN
Lee, Hongseok ; Mo, Young Kyu ; Lee, Onyou ; Kim, Junil ; Bang, Seungmin ; Kang, Jong O ; Nam, Seokho ; Kang, Hyoungku ;
Progress in Superconductivity and Cryogenics, volume 17, issue 1, 2015, Pages 44~47
DOI : 10.9714/psac.2015.17.1.044
High voltage superconducting apparatuses have been developed presently around the world under AC and DC sources. In order to improve electrical reliability of superconducting apparatuses with AC and DC networks, a study on the DC as well as the AC electrical breakdown characteristics of cryogenic insulations should be conducted for developing a high voltage superconducting apparatus. Recently, a sub-cooled liquid nitrogen cooling system is known to be promising method for developing a high voltage superconducting apparatus. A sub-cooled liquid nitrogen cooling system uses gaseous nitrogen to control the pressure and enhance the dielectric characteristics. However, the dielectric characteristics of gaseous nitrogen are not enough to satisfy the grade of insulation for a high voltage superconducting apparatus. In this case, the application of solid insulating barriers is regarded as an effective method to reinforce the dielectric characteristics of a high voltage superconducting apparatus. In this paper, it is dealt with a barrier effect on the DC and AC dielectric characteristics of gaseous nitrogen with respect to the position and number of solid insulating barriers. As results, the DC and AC electrical breakdown characteristics by various barrier effects is verified.
Degradation characteristics of 2G HTS tapes with respect to an electrical breakdown
Kang, Jong O ; Lee, Onyou ; Mo, Young Kyu ; Kim, Junil ; Bang, Seungmin ; Lee, Hongseok ; Lee, Jae-Hun ; Jang, Cheolyeong ; Kang, Hyoungku ;
Progress in Superconductivity and Cryogenics, volume 17, issue 1, 2015, Pages 48~52
DOI : 10.9714/psac.2015.17.1.048
The electrical insulation design for a superconducting coil system is important for developing high voltage superconducting apparatuses. Also, the degraded characteristics of superconducting tapes due to an electrical breakdown should be considered for superconducting coils design. In this study, the degradation characteristics of 2G high temperature superconducting (HTS) tapes were studied with respect to electrical breakdown tests. The degradation tests of 2G HTS tapes were performed with various stabilizer materials. The degradation characteristics of 2G HTS tapes such as critical current(Ic) and index number were observed by performing electrical breakdown tests. It was found that the characteristics such as Ic and index number can be degraded by an electrical breakdown. Moreover, it was concluded that the degradation characteristics of 2G HTS tapes were affected by a stabilizer material and applied breakdown voltage. The cross sectional view of 2G HTS tapes was observed by using a scanning electron microscope (SEM). As results, it is found that the degradation characteristics of 2G HTS tapes are concerned with hardness and electrical resistivity of stabilizer layers.