Superconducting fault current limiter

Details Superconducting fault current limiter Superconducting fault current limiter

1994-12-06

1995-09-12

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Superconductor protective circuits

361 58, 361 93, H02H 900

Patent

active

054502667

ABSTRACT:
A fault current limiter for use in alternating current transmission utilizes a (high temperature) superconductor body. If the current density through the body exceeds a critical value, the superconductor becomes a resistor; the fault current limiter makes use of this principle. In order to enable the critical current density to be selected from within a range of different values, the superconductor is immersed in a volume of cryogenic liquid, e.g. liquid nitrogen, in a vessel provided with a closure having an outlet communicating with a duct in which is disposed a manually adjustable back pressure regulator. The back pressure regulator enables the pressure in the ullage space of the vessel to be set at a chosen value, usually below atmospheric pressure. The liquid nitrogen is stored in the vessel at its boiling point which depends on the pressure in the ullage space. Accordingly, the temperature of the liquid nitrogen can be set by the regulator. This temperature in turn determines the value of the critical current density.

REFERENCES:
patent: 4020274 (1976-01-01), Dean
patent: 4486800 (1984-12-01), Franksen
patent: 4994932 (1991-02-01), Okamoto
Research Disclosure 330, "Cryogenic System for Fault Current Limiter":, No. 330112, pp. 829-831 (Oct. 1991).
K. E. Gray et al., Journal of Applied Physics, "A Superconducting Fault-current Limiter", vol. 49, No. 4, pp. 2546-2250 (Apr. 1978).

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