Vacuum insulated A-C superconducting cables
AssigneeMassachusetts Institute of Technology
InventorPeter Graneau
Life of this patent
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Abstract
A three-phase high-voltage superconducting cable having three hollow superconductors in a trefoil configuration and three heat shields disposed radially outward from the superconductors, all enclosed in an evacuated pipe. The heat shields are also in a trefoil configuration; they are electrically isolated from one another, from the superconductors, and from ground in order to suppress the flow of induced currents. The pipe provides mechanical protection of the foregoing elements, serves as vacuum vessel and carries the a-c shielding current induced by the cable load current.
Claims11
A three-phase a-c superconducting high-voltage cable, that comprises:
- three longitudinally extending hollow superconductors in a trefoil configuration cooled internally by a cryogenic fluid and in a vacuum environment;
- three longitudinally extending metallic heat shields disposed radially outward from the three superconductors, the heat shields being cooled by a cryogenic fluid and being electrically isolated from one another and from the hollow superconductors;
- and a longitudinally extending metallic vacuum enclosure disposed radially outward from the heat shields and electrically isolated therefrom and from the superconductors.
A three-phase a-c superconducting high-voltage cable that comprises:
- three longitudinally extending superconductors in a trefoil configuration cooled internally by a cryogenic fluid and in a vacuum environment;
- three longitudinally extending conductive shields disposed radially outward from the three superconductors, the conductive shields being cooled by a cryogenic fluid and being electrically isolated from one another and from the superconductors;
- and a longitudinally extending conductive vacuum enclosure disposed radially outward from the heat shields and electrically isolated therefrom.
Dependencies are inferred from the claim text.