SK66293A3 - Power cable - Google Patents

Abstract

The invention relates to a power cable with a screen (6) constructed of wires. To meet the various demands on the padding of the shield, the fixing of the shield wires and the longitudinal water tightness with a single tape material (5) to be arranged beneath the shield, said tape material consists of a non-woven fabric/foam laminate with the foam layer (52) disposed on the outside, the moisture-activatable swelling powder (53) being arranged between the two laminate layers (51, 52). <IMAGE>

Description

Technical field

The invention relates to a power cable with a shield made of wires, which is placed under the outer sheath on a conductive layer produced by extrusion, wherein a layer of conductive and adhesive strips is arranged between the conductive layer and the shielding wires.

BACKGROUND OF THE INVENTION Cable seals on the so-called layers of s

For non-conductive polyester synthetic nonwoven with carbon black,

To form the screening area consists of a carrier and a swellable layer, the carrier layers use a swellable layer mixture and a cellulosic slurry as a conductive swellable impregnated with a conductive fiber insert, the electricity in the screening area being strips inter alia in combination (DE-Z Draht und Panorama Cable “56).

conducting electricity into a swellable nonwoven which high mechanical strength of the nonwoven is used to form the fiber and to form the hydrogel-forming agents of the composition. In the electrically used swelling layer which as a carrier of strength cable conduits for conducting can be carried out by means of a conductive swelling bandage made of conductive swelling with a plastic inner sheath, April / May 1987, pages 54 to

In the case of medium-voltage cables of high voltage with cross-linked insulation and with wire shielding surrounding the outer conductive layer, it is also necessary to provide a damping layer between the outer conductive layer and the wire shielding.

This damping layer can be made, for example, of a laminate formed from a foamed fabric / web, which is wound as a strip with overlapping edges onto a conductive layer. In the event that the screening area is to be made waterproof in the longitudinal direction, i.e. to prevent water in the longitudinal direction, an electrically conductive polyester web may be used as a cushioning layer, with a non-conductive swellable web (DE-Z 'Draht) , 1982, Heft 4, page 203).

It is an object of the present invention to provide a power cable; which has a shielding area designed in such a way that in one manufacturing operation it is ensured that shielding wires (in particular shielding wires braided in the shape of SZ) are secured, good shielding damping and waterproofing in the longitudinal direction.

SUMMARY OF THE INVENTION [0003] The object of the present invention is to provide a power cable with a shield made of wires, which is located below the outer sheath on a conductive layer produced by extrusion, and a conductive and swellable tape filler layer is provided between the conductive layer and the shielding wires. (5) The conductive and swellable strips consist of composite layers (51, 52) of nonwoven and foamed fabric, wherein the foamed fabric lies outwardly, wherein a layer (53) of activatable swellable powder is disposed between the two layers (51, 52).

An advantage of the solution according to the invention is that in one manufacturing operation, the securing of shielding wires (in particular shielding wires braided in the shape of SZ) is ensured by a good design of shielding damping and ensuring water-tightness in the longitudinal direction.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be illustrated by way of example with reference to the accompanying drawings, in which: FIG. 1 shows a schematic embodiment of the individual layers surrounding the multicore conductor, and FIG. 2 shows a detailed embodiment of the damping layer.

DETAILED DESCRIPTION OF THE INVENTION

In FIG. 1 shows a staged pattern of an embodiment of a power cable consisting of a multi-core conductor 1, an extruded inner conductive layer 2, an extruded

and a crosslinked conductive layer of individual bases and rubber or insulation layer 3,

4, filler layer 5, wires and plastic,

8. The wires of the extruded outer sheath 6 of the inner sheath 7 formed on the extruded as well as the extruded outer sheath 6 forming the shield 6 can be braided into a shape

NW. Alternatively, instead of the inner sheath 7, a metal foil connected to the outer sheath 8 may be used in a single sheath layer.

Referring to FIG. 2, a strip comprising a laminate formed from an electrically conductive layer 51 of a web and an electrically conductive layer 52 of a foamed material is used. The pores of the foamed foam layer 52 are open.

Between the two layers 51 and 52 there is arranged a swellable powder layer 53, wherein the individual powder particles are substantially anchored in the forming filling layer, the outer conductive layer 4 is provided outwardly of the surface of the fleece layer 51. strip,

5, in the manufacture of the cable, it is positioned such that the foamed fabric layer 52 thereby forming a layer for receiving the braided shielding wires 6.

Claims (1)

A power cable with a shield made of wires, which is placed under the outer sheath on the conductive layer produced by extrusion, and between the conductive layer and the shielding wires there is a filler layer of conductive and swellable strips, characterized in that the filler layer (5) of conductive. The swellable tapes consist of composite layers (51, 52) of a nonwoven fabric and a foamed fabric, wherein the foamed fabric lies outwardly, wherein a layer (53) of activatable swellable powder is disposed between the two layers (51, 52). List of references Multi-core conductor 1 Conductive layer 2 Insulation layer 3 Outer conductive layer 4 Filling layer 5 T enen i e 6 Inner sheath 7 Outer sheath 8 layer 51 from fleeces layer 52 from foamed substances layer 53 from swelling powder