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AssigneePrysmian Cables Et Systemes France
InventorsStéphane Tognali, Pierre Gautier
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A protection device for a power cable that includes a central conductor surrounded by insulation based on paper impregnated with material based on impregnation oil may include a sheath around the insulation, a first portion of the cable stripped of the sheath, an adjacent portion of the cable stripped of both the insulation and sheath, the adjacent portion penetrating the connector; an outer protection extending over at least the first and adjacent portions, and extending over the connector; and/or a plug of high-permittivity mastic material filling an axial space extending along the adjacent portion. The outer protection may include a barrier layer in contact with the insulation along at least part of the first portion. The barrier layer may include elastomer material that is virtually impermeable to the oil. The plug may axially separate the barrier layer and connector to prevent migration of the oil into the connector.
A protection device for a power cable that comprises a central conductor surrounded by insulation based on paper impregnated with material based on impregnation oil, an end of the central conductor penetrating a connector, the protection device comprising:
A method of protecting a junction of a power cable having an insulation based on oil-impregnated paper and using a shrinkable sleeve, the method comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Cable fittings for cables filled with or surrounded by gas or oil: cable junctions
Cable junctions: protected by boxes, e.g. by distribution, connection or junction boxes
With devices for relieving electrical stress: connected to a cable shield only
Installation of electric cables or lines, or of combined optical and electric
About 3 years 2 months of term left · ends 21 Dec 2029 (estimated)
This application is a national stage entry from International Application No. PCT/EP2008/050423, filed on Jan. 16, 2008, in the Receiving Office of the European Patent Office, the entire contents of which are incorporated herein by reference.
1. Field
The present invention relates to the protection of power cables having insulation based on paper impregnated with an oil-based material, and in particular to the joint devices used for joining the ends of power cables in the case in which one power cable has an insulation based on impregnated paper.
The invention will be better understood on studying a few embodiments described by way of entirely non-limiting examples and illustrated by the appended drawings in which:
FIG. 1 is a sectional view of a hybrid joint device according to the invention in a first embodiment, applied to the case of joining two single-conductor cables, one of which has an insulation based on oil-impregnated paper and the other a plastic insulation;
FIG. 2 is a view similar to FIG. 1 of a second embodiment;
As illustrated in FIG. 1, the joint joins, on the right of the figure, one end 1 of a cable having an insulation comprising a plastic insulator 2 and on the left of the figure an end 3 of a cable having an insulation comprising an insulator 4 made of paper impregnated with an oil-based material, which is wound helically around the cable.
Each of the cable ends 1 and 3 is stripped in a staged manner so that the various lengths visible in the figure correspond to various concentric layers of the cable. The cable corresponding to the end 1 comprises, concentrically, at least one central conductor 5, the plastic insulator 2 and a semiconducting layer 6. The screen, the possible armouring and the external sheath of the cable have not been shown in the figure.
Similarly, the cable corresponding to the end 3 comprises, concentrically, a central conductor 8, then the first paper insulator 4 impregnated with an oil-based material wound in a helix, then optionally other insulator layers (not shown in FIG. 1) and a lead external sheath.