CN201222365Y - Aluminum cable steel reinforced aerial insulated cable - Google Patents

Abstract

The utility model discloses a steel-cored aluminum strand overhead insulated cable, which comprises a cable conductor, and an inner shielding layer and an insulating layer which coat the cable conductor, wherein the cable conductor is formed into a core strand body by an inner core portion which is formed by a plurality layers and a plurality strands of galvanized steel wires on the center of the cable and an outer core portion which is formed by a plurality layers and a plurality strands of electric pure aluminum wires on the outer layer of the inner core in the modes of twisting and pressing, an inner shielding layer is covered on the inner surface of the insulating layer, and the inner shielding layer and the insulating layer are simultaneously squeezed out. The steel-cored aluminum strand overhead insulated cable can improve the tensible strength, conductivity and assurance coefficient of cables, increases the erecting span of overhead cables, reduces poles and towers, saves production cost, improves the vibration resistance property, and prolongs the service span of cables.

Description

Steel core aluminum stranded wire overhead insulated cable

technical field

The utility model relates to a cable, in particular to an overhead insulated steel-cored aluminum stranded wire.

Background technique

At present, the overhead insulated cables produced according to the national standards are only aluminum-core overhead insulated cables, copper-core overhead insulated cables and aluminum alloy core overhead insulated cables. 10kV aluminum-core overhead insulated cables are commonly used in urban suburbs and rural areas, and the span is generally not greater than 50 m, if ordinary insulated aluminum core overhead insulated cables are erected in urban suburbs and rural areas, it will cause design difficulties, increase the number of towers, increase costs, damage strength, and insufficient margins; if copper core overhead insulated cables are used, it will cause problems. There are problems such as large conductor unit mass, large sag, small span, increased cost, and serious theft; if aluminum alloy core overhead insulated cables are used, the manufacturing technology is immature and unstable, the manufacturing process is cumbersome, and the manufacturing cost is high.

Utility model content

Aiming at the deficiencies in the prior art, the utility model aims to provide a steel-cored aluminum stranded overhead insulated cable with higher tensile strength, electrical conductivity and safety factor.

The technical scheme that the utility model adopts is:

An aluminum-steel-cored wire overhead insulated cable, comprising a cable conductor and an inner shielding layer and an insulating layer covering the conductor, the cable conductor is composed of an inner core formed by a multi-layer multi-strand galvanized steel wire located in the center of the cable and an inner The outer core part of the core outer layer is composed of multi-layer multi-strand electrical pure aluminum wires to form a core bundle in the form of twisting and pressing. The inner surface of the insulating layer is covered with an inner shielding layer, and the inner shielding layer and the insulating layer are extruded at the same time .

The inner core part is composed of a central galvanized steel wire located in the center of the cable and six galvanized steel wires surrounding the center, and the outer core part is composed of multiple strands of electrical pure aluminum single wires.

The thickness of the insulating layer of the covered cable conductor is 3mm-4mm, and the thickness of the inner shielding layer is 0.2mm-0.8mm.

The insulating layer of the covered cable conductor has a thickness of 3.4mm, and the inner shielding layer has a thickness of 0.5mm.

The inner shielding layer is a semi-conductive layer, uniformly covering the periphery of the inner shielding conductor.

The insulating layer is black polyethylene insulating material.

The utility model can improve the tensile strength, electrical conductivity and safety factor of the cable, increase the erection span of the overhead cable, reduce the pole tower, save the cost, improve the vibration resistance of the cable, and prolong the service life of the cable.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail.

The reference signs are explained as follows:

1--cable conductor

2--Inner shielding layer

3--Insulation layer

4--Inner core

5--Outer core

As shown in Figure 1, the ACSR overhead insulated cable is mainly composed of a cable conductor 1, an inner shielding layer 2 and an insulating layer 3 covering the conductor, and the cable conductor is composed of an inner core 4 located in the center of the cable and an outer core located outside the inner core. The outer core part 5 of the layer forms a core bundle in the form of twisting and pressing, in which the inner core part 4 is composed of a central galvanized steel wire located in the center of the cable and six galvanized steel wires surrounding the center. The outer core Part 5 is composed of multiple strands of electrical pure aluminum single wire. The above method not only ensures the stability and roundness of the cable structure, but also improves the comprehensive tensile capacity of the cable, ensuring that it can be laid overhead with a large span, and the inner shielding Layer 2 is a semi-conductive layer with a thickness of 0.5mm, which evenly covers the periphery of the inner shielding conductor. The insulating layer 3 is a black polyethylene insulating material with a thickness of 3.4mm. It adopts double-layer co-extrusion with the inner shielding layer Extruded at the same time, it can be bonded with the inner shielding layer as a whole, which not only meets the insulation requirements, but also increases the tensile strength and vibration resistance of the cable, and prolongs the service life of the cable.

The utility model combines the advantages of various existing cables. Compared with the aluminum-core overhead insulated cable, the utility model improves the tensile strength of the cable, increases the erection span of the overhead insulated cable, and improves the safety factor; Compared with the aluminum alloy core overhead insulated cable, the manufacturing process is simpler and the cost is lower.

The utility model is not limited to the above-mentioned best implementation mode, and anyone can draw other various forms of products under the enlightenment of the present invention. But no matter any changes are made in its shape or structure, all technical solutions identical or similar to the utility model are all within its protection scope.

Claims (6)

1. An aluminum-steel-conductor overhead insulated cable, comprising a cable conductor and an inner shielding layer and an insulating layer wrapping the conductor, characterized in that the cable conductor is composed of multi-layer multi-strand galvanized steel wires located in the center of the cable The inner core part and the outer core part composed of multi-layer multi-strand electrical pure aluminum wires located on the outer layer of the inner core form a core bundle body in the form of twisting and pressing. The inner surface of the insulating layer is covered with an inner shielding layer, and the inner shielding layer Extruded at the same time as the insulation layer. 2. The aluminum-steel conductor aerial insulated cable according to claim 1, wherein the inner core is composed of one central galvanized steel wire located in the center of the cable and six galvanized steel wires surrounding the center , the outer core is composed of multiple strands of electrical pure aluminum single wire. 3. The aluminum steel core stranded overhead insulated cable according to claim 1, characterized in that the thickness of the insulating layer of the covered cable conductor is 3mm-4mm, and the thickness of the inner shielding layer is 0.2mm-0.8mm. 4. The aluminum steel core stranded overhead insulated cable according to claim 3, characterized in that the thickness of the insulating layer covering the conductor of the cable is 3.4mm, and the thickness of the inner shielding layer is 0.5mm. 5. The aluminum steel core stranded overhead insulated cable according to claim 1, characterized in that, the inner shielding layer is a semi-conductive layer, uniformly covering the periphery of the inner shielding conductor. 6. The aluminum steel core stranded overhead insulated cable according to claim 1, wherein the insulating layer is made of black polyethylene insulating material.

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