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US 8,037,695 B2Granted
Fault current limiter
AssigneeROLLS-ROYCE plc
InventorsPhilip M. Sargent, Peter Malkin, Brian E. Simmers
Life of this patent
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Abstract
A fault current limiter comprising: an input node; an output node; a variable impedance element coupled between the input node and the output node; a closed loop cryocooler circuit, comprising a first cryocooler for cooling the variable impedance element and a second cryocooler, thermally coupled to the first cryocooler, for cooling the first coolant, wherein the variable impedance element comprises Magnesium Diboride.
Claims16
A fault current limiter comprising:
- an input node;
- an output node;
- a variable impedance element coupled between the input node and the output node;
- characterized in that a closed loop cryocooler circuit is provided comprising a first cryocooler which circulates a first coolant and at least one further cryocooler which circulates a second coolant, the cryocoolers are thermally coupled to cool the variable impedance element which is a super conducting material with a transition temperature in the range of 20K to 60K;
- and further characterized in that the variable impedance element is wholly immersed in the first coolant and the first cryocooler is wholly immersed in the second coolant.
2 more elements
Dependencies are inferred from the claim text.