Electricity: conductors and insulators – With fluids or vacuum – Conduits – cables and conductors
Patent
1986-11-10
1987-11-10
Nimmo, Morris H.
Electricity: conductors and insulators
With fluids or vacuum
Conduits, cables and conductors
174 29, H01B 906
Patent
active
047059141
ABSTRACT:
A high voltage flexible cable for pressurized gas insulated transmission line service has a continuous gas-tight cylindrical metallic conductive sheath corrugated circumferentially throughout its length. An elongated coextensive conductor member having an outer surface corrugated circumferentially throughout its length is disposed within the metallic sheath and separated from the sheath by a plurality of tubular elements of electrically insulating material disposed lengthwise of the cable in a transversely packed circumferential array around the conductor member between the sheath and the conductor member. The tubular elements are contacted throughout their length at least by the roots of the sheath corrugations and the crests of the conductor member corrugations that sufficiently indent the tubular elements radially of the cable to interlock the tubular elements with both the conductor member and the sheath to resist relative longitudal movement between the tubular elements and both the sheath and the conductor member. The tubular elements are dimensioned in cross section and deformed radially of the cable such that adjacent tubular elements circumferentially around the conductor member are in forceful surface contact to prevent particulate migration in the cable radial direction. The conductor member can be formed from a corrugated tube filled with wire conductors. Alternatively the conductor member can include two radially spaced apart concentric corrugated metallic tubes between which are disposed flat wires either tightly or loosely arranged or helically disposed.
REFERENCES:
patent: 2488211 (1949-11-01), Lemon
patent: 2556244 (1951-06-01), Weston
patent: 2998472 (1961-08-01), Bondon
patent: 3055967 (1962-09-01), Bondon
patent: 3121136 (1964-02-01), Mildner
patent: 3831636 (1974-08-01), Bittner
patent: 4092485 (1978-05-01), Wanser
patent: 4132855 (1979-01-01), Clark et al.
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