H - Electricity – 01 – B
Patent
H - Electricity
01
B
H01B 12/16 (2006.01) H01L 39/16 (2006.01) H02H 9/02 (2006.01)
Patent
CA 2062224
9OB146 ABSTRACT CRYOGENIC APPARATUS A fault current limiter for use in alternating current transmission utilises a (high temperature) superconductor body 22. If the current density through the body 22 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 22 is immersed in a volume 6 of liquid nitrogen in a vessel 2 provided with a closure 4 having an outlet 10 communicating with a duct 12 in which is disposed a manually adjustable back pressure regulator 14. The back pressure regulator 14 enables the pressure in the ullage space 6 of the vessel 2 to be set at a chosen value, usually below atmospheric pressure. The liquid nitrogen is stored in the vessel 2 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 14. This temperature in turn determines the value of the critical current density.
Gowling Lafleur Henderson Llp
The Boc Group Plc
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