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US 4,397,807 AGranted
Method of making cryogenic cable
AssigneeElectric Power Research Institute, Inc.
InventorsGeorge Bahder, Mario Rabinowitz
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AssigneeElectric Power Research Institute, Inc.
InventorsGeorge Bahder, Mario Rabinowitz
Estimating the term…
A cable for cryogenic use includes an inner conductor and a solid polymeric insulator loosely positioned about said inner conductor above 0.degree. C. A collapsible spacer can be positioned between the inner conductor and the polymeric insulator to further space the insulator away from the conductor and thereby accommodate greater shrinkage of the insulator. In fabricating the cable, the cable is sealed and pressure is applied to the cable to expand the insulation. The cable is placed inside a rigid cylinder having an inside diameter larger than the outside diameter of the cable. The cylinder is heated to facilitate expansion of the insulation, and the cylinder is subsequently cooled while maintaining pressure to the cable.
In an electrical cable having an inner electrical conductor, a conductor shield surrounding said conductor, insulation surrounding said conductor shield, and an insulation shield surrounding said insulation, the method of treating said cable for use in low temperatures without introducing damaging stresses during cooldown in said insulation comprising the steps of
Dependencies are inferred from the claim text.