High voltage flexible cable for pressurized gas insulated transmission line

A high voltage flexible cable for pressurized gas insulated transmission line service comprising in combination a continuous gas-tight cylindrical metallic conductive sheath corrugated circumferentially throughout its length, at least one elongated coextensive conductor member disposed within said sheath and having an outer surface corrugated circumferentially throughout its length, said conductor member comprising two concentric corrugated tubes of electrically conductive material of different diameters with a gap between the outer surface of the crests of the corrugations of the radially inner conductor tube and the inner surface of the roots of the corrugations of the radially outer conductor tube, a plurality of electrical conductor wires disposed loosely longitudinally of the cable within said gap, and a plurality of tubular elements of electrically insulating material disposed lengthwise of the cable in a transversely packed circumferential array around said conductor member between said sheath and said conductor member, said tubular elements being contacted throughout their length at least by the roots of the sheath corrugations and the crests of the conductor member corrugations and being sufficiently indented radially of the cable where they contact said roots of the corrugations of the sheath and said crests of the corrugations of the conductor member to become interlocked to resist relative longitudinal movement between said tubular elements and both said sheath and said conductor member, and said tubular elements being dimensioned in cross section and deformed radially of said 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 during cable use.

A high voltage flexible cable for pressurized gas insulated transmission line service comprising in combination a continuous gas-tight cylindrical metallic conductive sheath corrugated circumferentially throughout its length, at least one elongated coextensive conductor member disposed within said sheath and having an outer surface corrugated circumferentially throughout its length, said conductor member comprising at least one corrugated tube of electrically conductive material surrounding a plurality of electrical conductor wires disposed loosely longitudinally of the cable within said corrugated tube, and a plurality of tubular elements of electrically insulating material disposed lengthwise of the cable in a transversely packed circumferential array around said conductor member between said sheath and said conductor member, said tubular elements throughout their length being squeezed radially of the cable between said sheath and said conductor member with the roots of said sheath corrugations and the crests of said conductor member corrugatons radially indenting said tubular elements at axially spaced intervals sufficient to interlock said tubular elements with both said sheath and said conductor member to resist relative longitudinal movement between said tubular elements and both said sheath and said conductor member, and said tubular elements being dimensioned in cross section and deformed radially of said 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 during cable use.