Device for inductive current limiting of an alternating current

Details Device for inductive current limiting of an alternating current Device for inductive current limiting of an alternating current

1991-11-14

1992-08-18

Picard, Leo P.

Inductor devices

Coil and core

336DIG1, 335216, 323355, 323360, 505705, 505850, 505869, 505870, 505 1, 361 19, H01F 1704, H02H 900

Patent

active

051402904

ABSTRACT:
A device for inductive current limiting of an alternating current consisting of an induction coil (2), which includes at least one winding and through which current flows, a body (3) made of a ceramic high-temperature superconductor arranged concentrically to the latter and having a centrosymmetrical form which is hollow in the interior, and having located in the interior of said body (3) a concentrically arranged core (4) made of a soft magnetic material of high permeability. In normal operation (rated current), the superconductivity of the body (3) is effective and impedance of the induction coil (2) is very low. With overcurrent (mains short-circuit) the superconductivity disappears and the impedance of the induction coil (2) reaches its maximum, current-limiting value.

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I.E.E.E. Spectrum vol. 25, No. 5 May 1988 (New York, U.S.) K. Fitzgerald: "Superconductivity: fact vs fancy", pp. 30-41.
K. E. Gray, et al., "A superconducting fault-current limiter", J. Appl. Phys. 49, pp. 2546-2550, Apr. 1978.
B. P. Raju, et al., "Fault-current limiter with superconducting DC bias" IEE Proc. 129, Pt. C. No. 4, pp. 166-171, Jul. 1982.

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