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Joonhan Bae,Hoyong Kim,Hyungwook Kim Institute of Electrical and Electronics Engineers 2017 IEEE transactions on applied superconductivity Vol.27 No.4
<P>The equivalent thermal conductivity of the conduction cooled high-temperature superconducting (HTS) coil is one among important design parameters. It is possible to rapidly rise the hot spot temperature of HTS coil in quench, because the normal propagation velocity of HTS wire is lower than 100 times one of low-temperature superconducting wire such as NbTi or Nb3Sn alloy, and the conduction cooled HTS coil is operated on vacuum adiabatic condition. Generally, polyimide tapes for electrical insulation are inserted between layers of HTS coil but initial cool-down time due to low equivalent thermal conductivity of HTS coil get longer and the thermal runaway current in quench is decreased. Recently, the researches on HTS coil without insulation to improve the equivalent thermal conductivity have been performed. However, because HTS coil without insulation are short-circuit, the charging time to reach the designed magnet flux density of HTS coil is too long. In this paper, turn to turn insulation of HTS coil wound by HTS tapes with graphene-oxide coated Cu stabilizer is presented. The graphene oxide has relatively high resistivity and can be coated with a thickness of less than 10 μm. To confirm the effect of the proposed method, two HTS coil samples that were insulated with polyimide tape and coated with graphene oxide were fabricated. Based on the results of thermal analysis and characteristics tests, the equivalent thermal conductivity, initial cool-down time, critical current, and thermal runaway current of HTS coils with different turn to turn insulation were compared.</P>
Design of HTS Magnets for a 2.5 MJ SMES
Sangyeop Kwak,Seyeon Lee,Sangyeop Lee,Woo-Seok Kim,Ji-Kwang Lee,Chan Park,Joonhan Bae,Jung-Bin Song,Haigun Lee,Kyeongdal Choi,Kichul Seong,Hyunkyo Jung,Song-yop Hahn IEEE 2009 IEEE transactions on applied superconductivity Vol.19 No.3
<P>A 600 kJ HTS SMES system has been developed for power system stabilization as a national project in Korea. Successful operating tests of the 600 kJ were recently completed. In this paper, a 2.5 MJ class SMES with HTS magnets of single solenoid, multiple solenoid and modular toroid type were optimized using a recently developed multi-modal optimization technique named multi-grouped particle swarm optimization (MGPSO). The objective of the optimization was to minimize the total length of HTS superconductor wires satisfying some equality and inequality constraints. The stored energy and constraints were calculated using 3-D magnetic field analysis techniques and an automatic tetrahedral mesh generator. Optimized results were verified by 3D finite element method (FEM).</P>
Conceptual Design of HTS Magnet for a 5 MJ Class SMES
Myungjin Park,Sangyeop Kwak,Wooseok Kim,Jikwang Lee,Jinho Han,Kyeongdal Choi,Hyunkyo Jung,Joonhan Bae,Seokho Kim,Kiduk Sim,Haejong Kim,Kichul Seong,Songyop Hanh IEEE 2008 IEEE transactions on applied superconductivity Vol.18 No.2
<P>Superconducting magnetic energy storage (SMES) systems with High Temperature Superconducting (HTS) wires have been actively developed world-wide. A 600 kJ class SMES with Bi-2223 HTS wire has been in development as a national project since 2004 and is currently approaching the final testing stage of the first of three phases. In the second phase of the project, several MJ class HTS SMES will be developed. In this paper, designs of magnets for 5 MJ class SMES with DI-BSSCO and YBCO coated conductor are presented and compared.</P>
The Optimal Design of 600 kJ SMES Magnet Based on Stress and Magnetic Field Analysis
Sangyeop Kwak,Myungjin Park,Wooseok Kim,Seungyong Hahn,Seungwook Lee,Jikwang Lee,Kyeongdal Choi,Jinho Han,Joonhan Bae,Seokho Kim,Kiduk Sim,Haejong Kim,Kichul Seong,Hyunkyo Jung,Songyop Hahn IEEE 2008 IEEE transactions on applied superconductivity Vol.18 No.2
<P>In the development of large scale superconducting magnetic energy storage (SMES) systems, the problem of mechanical stresses induced in the windings by Lorentz force becomes more critical as dimensions of system and magnetic field increase. In this paper, an optimal design process of a 600 kJ SMES magnet combined with mechanical stress analysis is presented. A stress analysis method based on electromagnetic finite element analysis (FEA) is explained in detail. The results of the analysis led to the development of an optimum design, electro-magnetically and mechanically, of a single-pole double pancake coil (DPC) type 600 kJ SMES magnet. The stress in each DPC are described along with recommendations for winding tension in the manufacturing process to minimize radial and hoop stress in each DPC.</P>