Metal-clad electricity line and method of manufacturing it
AssigneeGEC Alsthom SA
InventorEdmond Thuries
Life of this patent
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Abstract
For each phase, a metal-clad line comprises a phase conductor surrounded by an aluminum sheath, with each aluminum sheath being surrounded by a sheath which is gas-tight relative to the outside. The inside of said gas-tight sheath(s) is/are filled with a gas having good dielectric properties. The aluminum sheath is made up of two half-shells with each half-shell being formed by a folded strip whose section is in the form of a semicircle terminated at each end by a shoulder and a flat, with the two half-shells being juxtaposed and assembled to each other via their flats. The invention also provides a method of manufacturing the metal-clad line which is particularly applicable to underground metal-clad lines.
Claims35
A method of manufacturing a multi-phase metalclad line comprising, for each phase of said multi-phase line, a phase conductor surrounded by an aluminum sheath, said aluminum sheaths being surrounded by at least one outer sheath which is gas-tight relative to the outside, the gas-tight outer sheath and the aluminum sheaths being filled with a gas having good dielectric properties and under pressure, wherein the method comprises the following steps:
- preparing gas-tight tubes of a length lying in the range 5 meters to 20 meters for making lengths of said gas-tight sheath of length L by forming two thin strips of aluminum into two respective half-shells and assembling together progressively said two half-shells as they are being made, thereby constituting said aluminum sheath, providing said strips with stiffening members (116), holding members (120, 130) for holding the phase conductor, and running means (114);
- disposing the phase conductor inside the aluminum sheath progressively while the phase conductor being fixed to said aluminum sheath by said holding member;
- during the assembly of the aluminum sheath and the conductor pulling progressively the assembly into a corresponding length of gas-tight outer sheath until the opposite end of the length of gas-tight outer sheath is reached;
- disposing at least one of such assembly inside a gas-tight outer sheath;
- repeating the above steps to make another length of metal-clad multi-phase line following the length having just been completed;
- interconnecting two following lengths of gas-tight outer sheath, the aluminum sheaths and conductors by link means;
- repeating all of the above steps until each of the phases of the line has the desired length;
- and
- filling the multi-phase line with the selected dielectric gas at the desired pressure, length by length.
A multi-phase metal-clad line comprising, for each phase, a phase conductor surrounded by an aluminum sheath, an outer sheath which is gas-tight relative to the outside surrounding each aluminum sheath, the insides of said gas-tight sheaths being filled with a gas having good dielectric properties, each said aluminum sheath being made from two half-shells, each half-shell being formed from a folded strip having a section in the form of a semicircle terminated at each end by a shoulder and by a flat, said two half-shells being juxtaposed and means assembling the flats of said two half-shells together.
A multi-phase metal-clad line comprising, for each phase, a phase conductor surrounded by an aluminum sheath, an outer sheath which is gas-tight relative to the outside commonly surrounding the aluminum sheaths for the phase conductors of the multi-phase metal-clad line, the inside of said gas-tight sheath being filled with a gas having good dielectric properties, each said aluminum sheath being made from two-half shells, each half-shell being formed from a folded strip having a section in the form of a semicircle terminated at each end by a shoulder and by a flat, said two half-shells being juxtaposed and means assembling the flats of the two half-shells together.
Dependencies are inferred from the claim text.