Electrical cable having a semiconductive water-blocking expanded layer
First Claim
1. Electrical cable comprising a conductor, at least one insulating layer, an outer metal shield and a layer of an expanded polymer material placed under the metal shield, characterized in that the layer of the expanded polymer material is semiconductive and includes a water-swellable material, and wherein the layer of the expanded polymer material has a degree of expansion between 5% and 500%.
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Accused Products
Abstract
Electrical cable, in particular for medium- or high-voltage power transmission or distribution, having a metal shield and a semiconductive water-blocking expanded layer. This layer exerts three main functions, the first one is to elastically and uniformly absorb radial forces of expansion and contraction of the cable coating layers due to thermal cycles of the cable during use, thus preventing deformations or breakages in the metal shield, the second one is to ensure electrical continuity between the cable core and the metal shield, the third one is to effectively avoid penetration and propagation of moisture and/or water along the cable core due, e.g., to possible ruptures in the metal shield. The third function is obtained by including in the expanded layer a water-swellable material.
258 Citations
29 Claims
- 1. Electrical cable comprising a conductor, at least one insulating layer, an outer metal shield and a layer of an expanded polymer material placed under the metal shield, characterized in that the layer of the expanded polymer material is semiconductive and includes a water-swellable material, and wherein the layer of the expanded polymer material has a degree of expansion between 5% and 500%.
Specification