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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 10, Issue 4 - Nov 2008
Volume 10, Issue 3 - Sep 2008
Volume 10, Issue 2 - May 2008
Volume 10, Issue 1 - Mar 2008
Selecting the target year
The quality evaluation of SmBCO CC by non-contact R2R Hall sensor array system
Oh, Jae-Geun ; Oh, Sang-Soo ; Ha, Dong-Woo ; Ha, Hong-Soo ; Ko, Rock-Kil ; Kim, Ho-Sub ; Song, Kyu-Jeong ; Lee, Nam-Jin ; Moon, Seong-Hyun ;
Progress in Superconductivity and Cryogenics, volume 10, issue 3, 2008, Pages 1~4
For the effective evaluation of superconducting properties of a coated conductor, with a long length, a non destructive characterization technique including a reel-to-reel (R2R) Hall measuring system have been developed. A non-contact R2R Hall sensor array system was particularly designed to measure the superconducting property of coated conductors. The superconducting properties of long length coated conductors were measured by using this device. It was demonstrated that this system was convenient to measure the intensity and distribution of the magnet field applied perpendicular to the surfaces of the coated conductors. Using this device, the defect and low critical current density(Jc) area of coated conductors could be detected in real-time measurement.
Comparative study of various buffer layers on IBAD- MgO template
Ko, K.P. ; Jang, K.S. ; Yoo, S.I. ; Oh, S.S. ; Ko, R.K. ; Moon, S.H. ; Kim, H.K. ;
Progress in Superconductivity and Cryogenics, volume 10, issue 3, 2008, Pages 5~8
On highly-textured IBAD-MgO templates, we have tried to find proper buffer layers among various candidate materials, including
(BZO). All buffer layers were deposited on the IBAD-MgO templates by KrF pulsed laser deposition(PLD). LAO layer showed an armorphous phase. LZO, LGO, and NGO layers showed polycrystalline growth. Only LMO and BZO layers exhibited c-axis oriented biaxially textured films. Optimally processed LMO buffer layer at deposition temperature of
of 100mTorr exhibited
and RMS roughness of 5.6nm. Interestingly, BZO buffer layers with
could be routinely produced over a wide PLD processing condition.
Development of SFCL Model using RTDS
Lee, Seung-Ryul ; Kwon, Jung-Ji ; Yoon, Jae-Young ; Lee, Byong-Jun ;
Progress in Superconductivity and Cryogenics, volume 10, issue 3, 2008, Pages 9~13
It is very important to study the protective relaying system from the viewpoint of technical analysis to apply superconducting power devices to real power systems. In this paper, we developed Superconducting Fault Current Limiter (SFCL) analysis model using Real Time Digital Simulator(RTDS) for protective relay tests in power system with SFCLs. The RTDS model has the operation mechanism of a real SFCL system.
Conceptual Design and Characteristic Analysis of a Superconducting Motor using Iron Cores in the Field
Lee, S.H. ; Kwon, S.O. ; Hong, J.P. ; Kwon, Y.K. ;
Progress in Superconductivity and Cryogenics, volume 10, issue 3, 2008, Pages 14~18
This paper deals with the conceptual design and characteristic analysis of core type superconducting motor using iron cores in the field. As the objective function of conceptual design, the flux quantity per pole is selected. In order to reduce the quantity of superconductors, the variations of flux quantity per pole by changing the design variables and area are investigated. Finally, the quantity of superconductors between air-cored and core type superconducting motor is compared under the same motor capacity. In addition, the dimensions and volumes of motors are compared.
A Probabilistic Reliability Assessment of KEPCO Future System with Applied HTS-FCL
Kwon, Jung-Ji ; Lee, Seung-Ryul ; Yoon, Jae-Young ; Choi, Jae-Seok ;
Progress in Superconductivity and Cryogenics, volume 10, issue 3, 2008, Pages 19~22
The power systems should be improved to reduce the number of black-out events occurring throughout the world. Quantitative evaluation of composite power system reliability is very important in a competitive electricity environment. The reason is that the successful operation of electric power systems under a deregulated electricity market depends on transmission system reliability management. This paper presents sensitivity analysis of probabilistic reliability indices of Korea power systems with checking application of HTS-FCL.
Critical current and AC loss characteristic of Coated Conductor under bending
Kim, Hae-Joon ; Sim, Ki-Deok ; Kim, Seok-Ho ; Cho, Jeon-Wook ; Jang, H.M. ; Lee, S.K. ;
Progress in Superconductivity and Cryogenics, volume 10, issue 3, 2008, Pages 23~26
Constructions of coated conductor which is differently from Bi-2223 is comprised multiple coatings on a base material or substrate and designed to achieve the highest degree of alignment possibility of the atoms in the superconductor material. In this study, we are measured and analyzed degradations of critical current according to diameter. In addition to study the effects of bending strain, we observed the AC loss of coated conductor and carried out analytical study for relation between Ic degradation and AC loss as well. The measurement of AC loss and numerical calculation was carried out based on Norris theory to compare with experimental results. The relationship between critical current and AC loss of HTS tapes with partial deformation by mechanical stress was studied. These results will amount the most important basis data in the of HTS cable, magnet, etc that winding work is required.
Design of a Cooling System for a portable HTS Superconducting Magnetic Energy Storage Using a Solid Nitrogen
Kim, K.L. ; Song, J.B. ; Kim, K.J. ; Lee, J.H. ; Lee, H.G. ; Koh, D.Y. ; Kim, S.H. ; Seong, K.C. ;
Progress in Superconductivity and Cryogenics, volume 10, issue 3, 2008, Pages 27~31
In order to cool the SMES coil to the operating temperature, conduction cooling is generally used. However, it often consumes a large amount of electric power because of it's continuous cryocooler operation. This can also lead to poor thermal stability and serious protection problems of the system. Solid nitrogen (SN2) can counter those disadvantages in the conduction cooling system because it has a large heat capacity. Particularly, a large amount of enthalpy with a minimal weight to the cold body of SN2 makes a compact and portable system by increase a recooling to recooling time period (RRTP) value. A conceptual design of the proto-type SN2 cooling system for a portable HTS superconducting magnetic energy storage (SMES) system will be introduced in this paper.
The Basic Insulation Design of 60 kV Bushing for Netural Line of 154 kV Class HTS Transformer
Choi, Jae-Hyeong ; Choi, Jin-Wook ; Kim, Sang-Hyun ;
Progress in Superconductivity and Cryogenics, volume 10, issue 3, 2008, Pages 32~35
A common problem in many fields of cryogenic power engineering is applying high voltage to cold parts of superconducting apparatus. In many cases, a bushing provides electrical insulation for the conductor which makes the transition from ambient temperature to the cold environment. The 60 kV class cryogenic high voltage bushing for neutral line of the 154 kV / 100MVA high temperature superconducting (HTS) transformer was described. The bushing is energized with the line-to-ground voltage between the coaxial center and outer surrounding conductors; in the axial direction, there was a temperature difference from ambient to about 77 K. For the insulation design of cryogenic bushing, electrical insulation characteristics of the GFRP were discussed in this paper.
Conceptual Design of a 5 MW HTS Motor
Baik, S.K. ; Kwon, Y.K. ; Kim, H.M. ; Lee, J.D. ; Kim, Y.C. ; Park, H.J. ; Kwon, W.S. ; Park, G.S. ;
Progress in Superconductivity and Cryogenics, volume 10, issue 3, 2008, Pages 36~42
The superconducting motor shows several advantages such as smaller size and higher efficiency against conventional motor especially utilized in ship propulsion application. However, this size reduction merit appears in large capacity more than several MW. We are going to develop a 5MW class synchronous motor with rotating High-Temperature Superconducting (HTS) coil. that is aimed to be utilized for ship propulsion so it has very low-speed, The ship propulsion motor must generate very high electromagnetic torque instead of low-speed. Therefore. the rotor (field) coils need very large magnetic flux that results in large amount of expensive HTS conductor for the field coil. In this paper a 5MW HTS motor for ship propulsion is considered to be designed with construction cost reduced via HTS field coil cost reduction because HTS conductor cost is critical factor in the construction cost of HTS motor. In order to reduce the HTS conductor amount. iron-cored rotor types are considered. so several cases with iron-core are compared one another and with an air-core case.
Preliminary Design of Current Lead for 21T Superconducting Magnet
Choi, Y.S. ; Kim, D.L. ; Yang, H.S. ; Lee, B.S. ; Painter, Thomas A. ;
Progress in Superconductivity and Cryogenics, volume 10, issue 3, 2008, Pages 43~46
Design of current lead for 21T superconducting magnets is presented. The current lead is composed of a normal metal element, conducting the current from room temperature to intermediate temperature, and an HTS element, conducting the current down to liquid helium temperature. The metal element is disengaged from the HTS element without breaking vacuum after excitation. The optimization of the lead is performed to minimize the thermal heat load when carrying operational current with some margin. In order to confirm the feasibility of our new design, the intermediate joint between a normal metal and HTS element is fabricated and the reliability is tested during engage and disengage performance. The effects of vacuum level and performance cycle on the electrical contact resistance are also investigated.