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Test on Superconducting AC Fault Current Limiter

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

Abstract

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.

Keywords

Critical Current Super Conducting Terminal Voltage Residual Inductance Superconducting Fault Current Limiter 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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