Test on Superconducting AC Fault Current Limiter

  • Daisuke Ito
  • Eriko S. Yoneda
  • Tsutomu Fujioka
  • Kazuyuki Tsurunaga


The authors have developed a new superconducting fault current limiter whose impedance during normal operation is very small. During fault conditions, the limiter behaves as a superconducting reactor. The limiter consists of a superconducting limiting coil and a superconducting trigger coil. The former coil has a larger critical current than the latter coil. These coils are wound non-inductively on coaxial cylindrical formers and are connected in parallel to each other. They are wound with AC superconductor having ultra-fine NbTi filaments. The limiter has a very little impedance, because both coils are wound non-inductively and in superconducting state during normal operation. On the other hand, in the case of fault conditions, the trigger coil quenches at a critical current. After the trigger coil quenching, the limiter becomes a superconducting reactor, because non-inductiveness is broken by trigger coil current. The fault current is, therefore, limited by the superconducting limiting coil to a certain value determined by the coil inductance. In experiments, the authors have succeeded in limiting a fault current level to 200A, with a limiter whose terminal voltage under limiting conditions was 54V.


Critical Current Super Conducting Terminal Voltage Residual Inductance Superconducting Fault Current Limiter 
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Copyright information

© The Institute of Electrical Engineers of Japan 1990

Authors and Affiliations

  • Daisuke Ito
    • 1
  • Eriko S. Yoneda
    • 1
  • Tsutomu Fujioka
    • 2
  • Kazuyuki Tsurunaga
    • 3
  1. 1.Energy Science and Technology LabToshiba R&D CenterKawasakiJapan
  2. 2.Power and Fusion Technology Development DepartmentToshiba CorporationTokyoJapan
  3. 3.Fuchu WorksToshiba CorporationTokyoJapan

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