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Superconducting Applications

Superconducting Device Applications

aspect of superconductivity
Low-temperature superconductivity (metallic)
  • Requires cooling to liquid helium temperature (4.2K/-269℃)
  • Already in practical use in conventional superconducting equipment
High-temperature superconductivity (copper oxide system)
  • Exhibits superconductivity even at temperatures above liquid nitrogen (77K/-196℃)
  • Verification and validation stage for practical use
    Sumas (Bi):
    First Generation (1G)
    Yttrium (Y) and rare earths (RE):
    Second Generation (2G)
  • High critical current in strong magnetic fields (application in strong magnetic fields)
  • Higher operating temperature (helium free)
  • Reducing the size and weight of conventional superconducting devices (metallic type)

Superconducting Magnet

5T large diameter Y-type high temperature superconducting magnet

Fujikura has been working on its own coil technology for some time, and in 2012 developed a 5T yttrium-based high-temperature superconducting magnet, one of the world's largest, with a room-temperature bore of φ20 cm.

  • Length of wire used:
    7200m (300m x 24 layers)
  • Number of turns:
    5775 turns
  • Operating current:
    333A@25K
  • Central magnetic field:
    5.0T (50,000 gauss)
  • Stored Energy:
    426kJ

Superconducting Cable

Superconducting Cable
Superconducting cable demonstration test

Fujikura is also developing superconducting cables, and in 2013 succeeded in demonstrating that by application superconducting wire with a high critical current, it was possible to reduce AC losses to one-quarter compared to conventional power cables.

  • 66kV-5kA class single-core cable system (10m)
  • Wire performance: Ic > 240 A/4mm-wide @77K, Self-field
  • Target AC loss < 2 W/m @5kA
  • Measured AC loss: 1.4W/m@77K, 0.95W/m@67K

Part of this research was carried out under a contract with the New Energy and Industrial Technology Development Organization (NEDO).

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