AC Losses of High-Tc Superconductor for Power Cables

Mukoyama, S.; Ishii, Hideo; Honjo, S.; Iwata, Y.; Miyoshi, K.; Tsubouti, H.; Yoshida, Taichi; Mimura, M.; Uno, Naoki

doi:10.1007/978-4-431-66879-4_297

Cited by 4 publications

(2 citation statements)

References 1 publication

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“…A cooling system that uses bronze sintered porous media with subcooled liquid nitrogen was proposed to remove the heat generated at these joints under operating conditions to make the demountable helical reactor design more feasible [15]. HTS power transmission cable projects [27][28][29] may also offer fusion relevant solutions for joints [28,29]. For example the 275 kV-3 kA, 30 m HTS cable system from Yagi et al [28] demonstrates that soldered joints remain robust in a demanding AC environment.…”

Section: Introductionmentioning

confidence: 99%

Soldered joints—an essential component of demountable high temperature superconducting fusion magnets

Tsui

Surrey

Hampshire

2016

Supercond. Sci. Technol.

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Demountable superconducting magnet coils would offer significant benefits to commercial nuclear fusion power plants. Whether large pressed joints or large soldered joints provide the solution for demountable fusion magnets, a critical component or building block for both will be the many, smaller-scale joints that enable the supercurrent to leave the superconducting layer, cross the superconducting tape and pass into the solder that lies between the tape and the conductor that eventually provides one of the demountable surfaces. This paper considers the electrical and thermal properties of this essential component part of demountable high temperature superconducting (HTS) joints by considering the fabrication and properties of jointed HTSs consisting of a thin layer of solder (In52Sn48 or Pb38Sn62) sandwiched between two rare-earth-Ba2Cu3O7 (REBCO) second generation HTS coated conductors (CCs). The HTS joints are analysed using numerical modelling, critical current and resistivity measurements on the joints from 300 to 4.2 K in applied magnetic fields up to 12 T, as well as scanning electron microscopy studies. Our results show that the copper/silver layers significantly reduce the heating in the joints to less than a few hundred mK. When the REBCO alone is superconducting, the joint resistivity (RJ) predominantly has two sources, the solder layer and an interfacial resistivity at the REBCO/silver interface (∼25 nΩ cm2) in the as-supplied CCs which together have a very weak magnetoresistance in fields up to 12 T. We achieved excellent reproducibility in the RJ of the In52Sn48 soldered joints of better than 10% at temperatures below Tc of the REBCO layer which can be compared to variations of more than two orders of magnitude in the literature. We also show that demountable joints in fusion energy magnets are viable and need only add a few percent to the total cryogenic cost for a fusion tokamak.

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Section: Introductionmentioning

confidence: 99%

Soldered joints—an essential component of demountable high temperature superconducting fusion magnets

Tsui

Surrey

Hampshire

2016

Supercond. Sci. Technol.

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“…Many research prototypes for power cables [9][10][11], motors [12], fault current limiters [13], SMES (Superconducting Magnetic Energy Storage) [14] and transformers [15] using CC were demonstrated, and the projects for the application of superconducting AC power cables in a real power grid are now in progress in several countries [16,17].…”

Section: Introductionmentioning

confidence: 99%

Progress in research and development for REBCO coated conductors by reactive co-evaporation

Oh¹,

Kim²,

Ha³

et al. 2013

Progress in Superconductivity and Cryogenics

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This paper reviews recent progress in research and development (R&D) of reactive co-evaporation for high performance REBCO coated conductors in Korea. Two types of reactive co-evaporation methods were developed for the deposition of SmBCO and GdBCO superconducting layers respectively on the IBAD (Ion Beam Assisted Deposition)-MgO template in the Korean coated conductor project. Batch type reactive co-evaporation equipment and its processing were developed for SmBCO coated conductors at Korea Electrotechnology Research Institute (KERI) in conjunction with the Korea Advanced Institute of Science and Technology (KAIST), and a very high critical current exceeding 1,000 A/cm at 77 K in the self field was achieved through the optimization of deposition parameters. Reel-to-reel type reactive co-evaporation processing with a high conversion rate was also developed, while long length GdBCO coated conductors have been routinely produced by SuNAM Co. The minimum critical current of 422 A/cm-w at 77 K in self field was confirmed for 1 km-long GdBCO tape.

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