Superconductive fault current limiters

Details Superconductive fault current limiters Superconductive fault current limiters

1996-01-11

1997-12-02

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Superconductor protective circuits

361 10, H02H 700

Patent

active

056942796

ABSTRACT:
An inductive Superconductive Fault-Current Limiter (SCFCL) includes an iron core having a wound primary winding and a short-circuited superconductive secondary. The secondary remains superconductive up to a fault-current level in the primary, after which the superconductive secondary becomes resistive, the primary ampere-turns are not balanced, and the device becomes highly inductive, so limiting the fault-current. The fault-current threshold is increased without exceeding available critical superconductive current density levels and with a moderate superconductive coating thickness by using a stack of superconductive coated washers having a large radial extent compared to the coating thickness.

REFERENCES:
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patent: 5140290 (1992-08-01), Dersch
patent: 5173678 (1992-12-01), Bellows et al.
patent: 5241447 (1993-08-01), Barber et al.
patent: 5546261 (1996-08-01), Yoshida et al.
A Magnetic Shielding Type Superconducting Fault Current Limiter using a Bi2212 Thick Film, Cylinder, Ichikawa & Okazaki, IEEE Transactions on Applied Superconductivity, vol. 5, No. 2, Jun. 1995.
Current Limiting Reactor Based on High-Tc Superconductors, IEEE Transactions on Magnetics, vol. 27, No. 2, Mar. 1991.

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