Multi-layer power cable with metal sheath free to move relative to adjacent layers
AssigneePirelli Cable Corporation
InventorsCarlo Marin, Fabrizio Marciano-Agostinelli, Paul K. dePratter, Frank L. Kuchta
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AssigneePirelli Cable Corporation
InventorsCarlo Marin, Fabrizio Marciano-Agostinelli, Paul K. dePratter, Frank L. Kuchta
Estimating the term…
An electrical power cable with a stranded conductor, a semi-conductive stress control layer around the conductor, a layer of insulation around the stress control layer, a semi-conductive insulation shield layer around the layer of insulation, an imperforate metal strip with overlapping edge portions around the shield layer and a polymeric jacket around the metal strip. The strip is free to move with respect to the jacket and the shield layer with expansion and contraction of the cable elements with temperature changes, and the overlapping edge portions of the strip are bonded together by an adhesive which permits the edge portions to move relative to each other with such temperature changes without creating fluid passageways between the edge portions. A cushioning layer can be between the shield layer and the strip and preferably, the cable is water sealed.
In an electrical power cable operable throughout a predetermined temperature range and comprising a stranded conductor formed by a plurality of wires stranded together and in conductive contact with adjacent wires, a semi-conductive stress control layer around said conductor, a layer of insulation around said stress control layer, a semi-conductive insulation shield layer around said layer of insulation, an imperforate metal shield around said shield layer, said metal shield being formed by a metal strip with overlapping edge portions, and a jacket of polymeric material around said metal shield, wherein the improvement comprises a metal shield which is free to move with respect to said insulation shield layer and said jacket with expansion and contraction of said metal shield, said semi-conductive stress control layer, said insulation, said insulation shield layer and said jacket when said cable is subjected to temperature changes in said predetermined range and an adhesive bonding said overlapping edge portions together, said adhesive permitting said edge portions to move relative to each other without causing a fluid passageway between said edge portions when said cable is subjected to temperature changes in said predetermined range whereby fluid is prevented from passing between said overlapping edge portions and buckling and fractures of said metal shield is prevented even though said cable is subjected to repeated temperature changes within said range.
Dependencies are inferred from the claim text.