Title: Vacuum insulated A-C superconducting cables

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.

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Inventors: Graneau, Peter (Concord, MA, US)

Application Number: 538430
Filing Date: 1975-01-03
Publication_date: 1976-03-30
Assignee: Massachusetts Institute of Technology (Cambridge, MA)
Primary Class(es): 174/15.5 174/27, 505/884
Other Classes:
US Patent Ref:

3343035	Sep, 1967	Garwin	174/15.
3463869	Aug, 1969	Cooley et al.	174/15.
3562401	Feb, 1971	Long	174/27.
3646243	Feb, 1972	Graneau et al.	174/DIG.
3686422	Aug, 1972	Doose	174/27.
3723634	Mar, 1973	Aupoix et al.	174/27.
3726985	Apr, 1973	Aupoix et al.	174/27.
3743760	Jul, 1973	Sassin	174/27.
3749811	Jul, 1973	Bogner et al.	174/DIG.
3780205	Dec, 1973	Aupoix et al.	174/27.
3808351	Apr, 1974	Moisson-Frankhauser	174/27.

Other Refs:
Primary Examiner: Grimley, Arthur T.
Assistant Examiner:
Attorney: Smith, Jr.; Arthur A., Shaw; Robert, Santa; Martin M.