DK170902B1 - LWL cable - Google Patents

Abstract

In an optical cable having a core, optical conductors and electrical conductors, it is provided that the core consists of twisted electrical conductors, that electrical conductors are arranged in outside spaces of the core formed by the electrical conductors and that between each two conductors located in the outside spaces of the core optical conductors are arranged.

Description

in DK 170902 B1

FO CABLE

For example, LWL cables are used as air cables for power supply. LWL is an abbreviation for light waveguides. In the special case with an LWL grounding air cable, the light waveguide serves as a grounding cable.

Such cables are known, for example, from GB-A-1 598 540 or DE-A-3 205 616.

10

For a long time, air cables with a metallic reinforcement (grounding air cables) with CU conductors have been known. From there, LWL air cables were diverted, with the CU leaders being replaced by LWL veins. The core of such air cables thus consists of an LWL soul with a more or less thick PE jacket. This core has a diameter of 6-10 mm. Above the core, one or more layers of strands (round or segmented) are struck. The traction-absorbing steel or aluminum-clad steel (stalum) wires are arranged in the outermost or second-outermost 20 layers to ensure a safe transfer of power to the spiral reinforcement. The disadvantage of such air cables is that in the interior of the air cable to the LWL soul, 30-80 mm2 cross sections of the cord are uselessly overused as a result, the cables are 3-7 mm thicker than conductor cables of the same supporting / joint cross section.

The object of the invention is to keep the diameter increase due to the only transfer technology-relevant LWL part as small as possible and to protect the fibers of the LWL-30 veins securely from environmental influences such as drag and pressure. This task is solved by an LWL cable with a core, LWL conductors and electrical conductors according to the invention by the features of claim 1.

The invention allows for secure attachment of the air cables to the support and tensioning masts by means of helical arms, ie to bring the upright part as far out as possible. In addition, the invention enables as far as possible a solution for air cables with 2-12 LWL, as well as a secure sleeve assembly, ie a simple separation of the 5 LWL part or parts from the cable.

Assuming that with an LWL cable according to the invention, for each maximum 3 fibers, a LWL vein of 2 mm diameter is sufficient, then the necessary cross-sectional increase 10 for a 12-fiber air cable, for example 12.5 mm2, is sufficient. For example, in a conduit-necessary cross section of, for example, 150 mm2, this means a cross-sectional increase of 8% over the previously known air cables of 20-52%, ie a 4% increase in diameter compared to 10-23%. At a cable cross section of 15 300 mm2 (Al / St 265/35), there is even only 2% diameter increase. That is, an air cable would have a diameter of 20.4 mm versus 20.0 mm relative to the comparable cable. The claimed advantage is achieved by the invention in that cable elements - such as round wires and profile wires - take over the position fixing and protection of the LWL veins.

The invention is explained in the following by means of an exemplary embodiment.

FIG. 1 and 2 show an LWL cable according to the invention, which can be used as an LWL grounding cable. In the LWL cable according to the invention, the core of FIG. 1 and 2 of four interconnected electrical wires 1 which are merged into a "fourer". In the outer wedge grooves of the core formed by the electrical wires 1, there are electric wires 2 which form a first layer surrounding the core. The threads 2 in the first layer, for example, consist of aluminum, an aluminum alloy (Aldrey) or of aluminum clad steel (Stalum). The wires 2 in the first layer are fixed by the 35 outer ciliaries in the core formed by the wires 1. Of the wires 1 forming the core, of the wires 2 forming the first layer, as well as of the wires 3 of a second layer, chambers 4 are formed into which the LWL veins 5 (hole / bottom tears) are inserted. The diameter of the LWL veins 5 and the threads 2 of the first layer, as well as the diameter of the core formed by the threads 1 and 5, the depth of the outer wedge grooves of the core are aligned so that in the finished state, the circumference formed by the threads 2 in the first layer, not at all, respectively only slightly fixing the LWL veins 5. In order to ensure fiber mobility over the required stretching and expansion area and at the same time to allow for flexibility of this inner soul, the threads 2 in the first layer and thus also the outer core of the core are spirally formed. with a stroke length ratio of 6-12.

15 The threads 3 in the second layer that are above it

first, as well as the threads in any additional layers are always applied in the opposite direction to the threads in the layer located below. The stroke length ratio of the second layer or additional layer, respectively, is 20 DIN 41 200 and is in the range of 10-15. IN

The exemplary embodiment forms the core formed by the threads 1, the threads 2 in the first layer as well as the threads 3 in the second layer ensuring stable chambers 4 for the LWL veins 5.

25 The threads in each layer may have different diameters.

Claims (11)

An LWL cable consisting of a core of sun-drenched core wires (1) as well as layered, sun-drenched light-waveguides 5 (5) and wires (2, 3), the core of which consists of electrical wires (1) forming in the composite conduit outer wedges. in that a outer layer electric wires (2) are arranged in these outer wedge grooves, the electric wires arranged in two adjacent outer wedge grooves together with the wires (3) from a second layer located in this region forming a chamber (4), which extends spirally in the axial direction and wherein the light waveguide veins (5) are disposed. LWL cable according to claim 1, characterized in that four electrical wires (1) are connected to a four core. LWL cable according to one of claims 1-2, characterized in that the elements of the layers are arranged in a layer-changing direction. LWL cable according to one of claims 1-3, characterized in that the LWL-conductors (5) and the electric wires (2) in the first layer are dimensioned such that the electric wires (2) in the second layer does not affect the LWL veins (5). LWL cable according to one of claims 1-4, characterized in that the first layer strands (2) are arranged in the outer wedge grooves of the core 30 at a distance so that the LWL veins (5) lie between the first layers wires (2) and that the strands of both layers have opposite directions so that the chambers (4) for the LWL veins are arranged helically around the cable axis. 35 LWL cable according to one of claims 1-5, characterized in that the stroke length with which the chambers (4) to the LWL veins (5) are guided about the cable axis is chosen so that the fibers in LWL -holes / bottoms (5) are free of forces under all cable loads. LWL cable according to one of claims 1 to 6, characterized in that the LWL veins (5) have a cross-section such that they are fixed in the chambers (4) but are not compressed. LWL cable according to one of claims 1-7, characterized in that the stroke length ratio of the first layer is between 6 and 12. LWL cable according to one of claims 1 to 8, characterized in that the LWL-veins (5) are single or bottom tears. LWL cable according to one of claims 1-9, characterized in that the years consist of a polyester, LCP or GFK casing. 20 LWL cable according to one of claims 1-10, characterized in that the electrical wires are made of aluminum or Aldrey or are Alumoweld wires.