Cylindrical radially shrinkable sleeve for an electrical...

H - Electricity – 02 – G

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Details

H02G 15/184 (2006.01) H01B 1/22 (2006.01) H01B 3/00 (2006.01) H01B 3/46 (2006.01) H02G 15/068 (2006.01) H02G 15/103 (2006.01) H02G 15/18 (2006.01)

Patent

CA 2188430

Cylindrical radially shrinkable sleeve (10) for enclosing a connection or an end termination of an electrical cable, in particular for a medium voltage cable, having an insulation surrounded by a shielding layer, the sleeve (10) comprising an outer shielding layer (16) of semi-conductive material and at least an insulation layer (14) on the inner side of the shielding layer (16), with the unit of the cylindrical layers made of permanent flexible material adapted to be retained in a radially expanded state by mechanical support means, preferably a support core, wherein the radially innermost layer is of a homogeneous material having a relative dielectric constant which is significantly larger than that of said insulation of said cable. The material is a matrix of dielectric plastic material containing microspheres which are electrically conductive either totally or only at the outer surface thereof and which have a diameter between 10 and 500 µm. The microspheres are uniformly mixed into said matrix material, with the compound having a dielectric constant equal to or larger than 3 and a dielectric strength of at least 5 kV/mm.

Manchon cylindrique (10) rétractable radialement conçu pour envelopper une connexion ou une borne de câble électrique, en particulier un câble moyenne tension, dont l'isolation est entourée d'une couche de blindage. Ledit manchon (10) comporte une couche de blindage externe (16) en matériau semi-conducteur et au moins une couche d'isolation (14) sur le côté interne de la couche de blindage (16), l'ensemble des couches cylindriques étant constitué de matériau souple permanent conçu pour être maintenu à l'état radialement déployé par un moyen de support mécanique, de préférence une âme de support, la couche radialement la plus interne étant en matériau homogène à constante diélectrique relative sensiblement supérieure à celle de l'isolation dudit câble. Le matériau consiste en une matrice de matière plastique diélectrique contenant des microbilles électroconductrices dans leur intégralité ou seulement au niveau de leur surface externe, et présentant un diamètre compris entre 10 et 500 µm. Les microbilles sont mélangées de manière homogène dans ledit matériau matriciel, le composé présentant une constante diélectrique supérieure ou égale à 3 et une résistance diélectrique d'au moins 5 kW/mm.

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