Electric power cable line and a method of fabricating the same
AssigneeFujikura Ltd.
InventorsHiroto Ooshima, Michio Takaoka, Hisao Sakaguchi
Life of this patent
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Abstract
An electric power cable line is arranged in which the insulating layer is increased to a greater thickness at two end portions of each cable than a thickness at the other or center portion of the same. Since the insulating layer is increased in thickness at the end portions of the cable, thus an electrical stress exerted on the overall layer construction of the end portions is lowered. Hence, the dielectric strength of the end portions of the cable becomes high and the power cable line will thus be increased in the operational reliability.
Claims9
A finished electric power cable line comprising a multiplicity of cables joined to one another, each of the multiplicity of cables having a cable conductor, an inner semiconductive layer over said cable conductor, an insulating layer over said inner semiconductive layer, and an outer semiconductive layer over said insulating layer, said insulating layer of each of said multiplicity of cables being greater in thickness at first and second end portions thereof which correspond respectively to first and second end portions of the finished cable, than at other remaining portions thereof which are intermediate said first and second end portions thereof.
A method of fabricating finished cables which are joined to one another to form an electric power cable line, the method comprising the steps of:
- applying an inner semiconductive layer on a cable conductor;
- covering said inner semiconductive layer with an insulating layer so that a thickness of the insulating layer at particular portions of the cable conductor, which will become first and second end portions of a finished power cable line, is greater than a thickness of other intermediate portions of the cable conductor between said first and second end portions of the finished power cable line;
- applying an outer semiconductive layer on said insulating layer;
- applying a shield layer on said outer semiconductive layer;
- and
- covering said shield layer with a sheath.
Dependencies are inferred from the claim text.