SE462773B - ELECTRIC MULTI-conductor cable provided with control cables - Google Patents

Description

462 775 10 15 20 25 30 35 2 The conductor's copper wires can be arranged on the core in any way. It has proved particularly advantageous, however, in the practice of the invention to arrange the copper wires of the conductor symmetrically on the core.

Depending on the direction of the influencing mechanical forces, damage to or destruction of the information or control part is thereby avoided.

It is further advantageous to arrange the single wires of the conductor over the insulating core by folding or bundling. The core can then be made of an insulating material, for example of a rubber-elastic material on silicone rubber base, polyurethane and the like, which under tensile load stretches under the concentrically arranged conductor more strongly than the copper wires. Another suitable design is obtained if the core consists of a cord of a suitable paper, on which the individual copper wires are applied concentrically. Further advantageous is a core of a support element, which is surrounded by an insulating or conductive, elastic or plastic casing.

Regardless of the core type, it is crucial that the conductor wires can be stretched over the cross-sectional core, without conductor breakage.

Said support element advantageously consists of a high-strength plastic string. With high flexibility and sprain strength, the control or information parts are thereby able to absorb large tensile forces as well, without there being an immediate tearing of the control parts or rupture by loop formation during cable bending.

In a development of the invention, the plastic strand itself may consist of a single plastic wire, but it may also, suitably, consist of several entangled or tangled plastic wires with high tensile strength.

The plastic wires or strands can be made of different materials, as long as they have sufficient tensile strength. Particularly suitable, however, it has already been found that aromatic homo- or copolyamides are used for the production of the plastic strands or the threads.

Carrying elements made from this have the required tensile strength, without the flexibility required by the cable or cable being adversely affected.

Figures 1 and 2 show as an exemplary embodiment of the invention a winchable medium voltage cable.

The conductors 1 in the three-phase cable according to Fig. 1 are fine-wire litz conductors and serve for energy transfer. They are surrounded by a conductor housing 2 of plastic foil. In addition, there is the insulation 3, which for example consists of -nature or synthetic rubber, but can also be made of a so-called thermoplastic rubber. Over the insulation, there is with the insulation 3 welded, extruded outer joint layer 4; it can be prepared, for example, from ethylene-vinyl acetate copolymer. The outer guide layer is followed by the symmetrically divided single concentric protective conductor 5 consisting of switched on or twisted copper wires 5.

In the wedge-shaped spaces formed by the merging of the main conductor parts 1, 2 and 3, information or control parts 19 are arranged. As can be seen in Fig. 2, they consist of a support element 6, which is designed as a paper cord, which is surrounded by a soft rubber casing 7. In addition, there is the wound conductor 8 consisting of individual, tinned copper wires in the guide part, which is enclosed by the insulation. 9. Several such control parties can be merged with each other and placed as a group of parties in the wedge-shaped spaces of the main part.

In another embodiment, the support element 6 consists of a high-strength plastic string, for example folded or tangled single wires of an aromatic homo- or copolyamide.

The folded joints consist of the upper main parts folded together in a core inlet 10 and the information and guide parts 19 located in the wedge spaces. 10 4 kilograms lying information and control parties.

The folded joint is enclosed by means of a winding of foil or strip which serves as a common part casing 12.

For the purpose of increasing the slidability of the parts relative to each other and relative to the jacket, a mass 13 with conductivity can be used. Above the folded joint is the inner jacket 14 of a rubber compound based on natural or synthetic rubber. This is followed by a foil or tape winding 18 and finally the outer jacket on the basis of synthetic rubber.

Claims (8)

10 15 20 25 30 462 775 5 PATENT REQUIREMENTS 1. l. Multiparty, flexible, electric cable or line for energy transmission, with in the wedge-shaped single bundles formed existing spaces, for control or information purposes additional parties, characterized - that the control or the information parties (19) consist of a core (6) and of a conductor (8) arranged around this core of a plurality of single wires. Cable or cable according to Claim 1, characterized in that the single wires are symmetrically arranged on the core. Cable or wire according to claim 1 or 2, characterized in that the core consists of an elastic or plastic material. Cable or wire according to claim 3, characterized in that the core consists of a paper cord. Cable or wire according to claim 3, characterized in that the core consists of a support element, which is surrounded by an elastic or plastic casing (7). Cable or cable according to claim 5, characterized in that the support element consists of a high-strength plastic strand. 7. A cable or wire according to claim 6, characterized in that the plastic strand consists of single or several entangled or tangled plastic wires with high tensile strength. Cable or wire according to claim 6, characterized in that the plastic strand or wires are made of aromatic homo- or copolyamides.