Cable having lightning protective sheath system

H - Electricity – 01 – B

Patent

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Details

H01B 7/28 (2006.01) G02B 6/44 (2006.01)

Patent

CA 2061365

A communications cable for use in buried environments in an outside plant includes a core comprising at least one transmission medium and a mechanically strengthened, thermal resistant barrier layer disposed about a plastic tubular member. A metallic shield and a plastic jacket are disposed about the barrier. The barrier layer may comprise a tape which is made of a material such as woven glass or an aramid fibrous material, for example, which is resistant to relatively high temperatures, which has suitable strength properties in all directions and at elevated temperatures and which is characterized by properties which cause the barrier layer to impede the passage therethrough of particles which are sufficiently large to cause damage to the core. In a preferred embodiment, the thermal barrier layer also includes provisions for preventing the longitudinal flow of water within the cable. Such a waterblocking capability may be provided by a barrier layer comprising a laminate comprising a high temperature resistant tapeand at least one other tape with a superabsorbent powder therebetween or anothertape which has been impregnated with a superabsorbent material.

Cette invention concerne un câble de communications du type à enfouir à l'extérieur d'une installation et qui comprend une âme comportant au moins un support de transmission et une couche barrière thermo-isolante à renfort mécanique, disposée autour d'un élément tubulaire en plastique. Une gaine métallique et une chemise en plastique entourent la couche barrière qui peut comprendre un ruban, par exemple en fibres de verre ou en fibres aramides tissées, qui résiste à des températures relativement élevées, qui présente une résistance suffisante dans toutes les directions de sollicitation et qui présente des caractéristiques filtrantes empêchant le passage de particules suffisamment grosses pour endommager l'âme. Dans une variante privilégiée, la couche barrière comprend également des moyens d'empêcher l'écoulement longitudinal d'eau à l'intérieur du câble. Cette capacité de s'opposer à l'écoulement de l'eau peut être assurée en utilisant une couche barrière stratifiée, constituée d'un ruban résistant aux hautes températures et d'au moins un autre ruban avec une poudre ultra absorbante interposée ou un autre ruban imprégné de matière ultra absorbante.

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