CN205104266U - High pressure resistant overhead insulated cable - Google Patents

Abstract

A high-voltage-resistant overhead insulated cable, comprising multiple strands of insulated wire cores, the multiple strands of insulated wire cores are twisted with the load-bearing steel core as the center of a circle, and covered by a high-density polyethylene outer sheath, wherein the insulated wire cores include composite The conductor, the composite insulating layer covering the composite conductor and the high-density polyethylene inner sheath outside the composite insulating layer, the composite conductor is alternately distributed and twisted by aluminum strands and aluminum alloy strands, and the aluminum strands are made of multiple It is formed by twisting soft aluminum wires, and the composite insulation layer includes an inner layer of polyvinyl chloride and an outer layer of cross-linked polyethylene. On the one hand, the utility model effectively improves the high-voltage resistance of the overhead insulated cable through the high-density polyethylene sheath, and on the other hand, optimizes its structure so that it can withstand high voltages above 35kV.

Description

A high voltage resistant overhead insulated cable

technical field

The utility model belongs to the technical field of overhead insulated cables, in particular to a high-voltage-resistant overhead insulated cable.

Background technique

Overhead distribution network is an important part of urban and rural power grids. With the development of society and economy, the electricity consumption of the whole society is increasing rapidly. The 10kV overhead insulated cables with a large amount of load are overloaded and the power supply capacity is insufficient. In addition, overhead insulated cables work under sunlight for a long time, and many transmission lines need to pass through forests or large forest areas, which easily damages the insulation layer of cables, and has poor weather resistance, insulation, and shielding performance, making it difficult to achieve normal service life.

As we all know, in long-distance power transmission, increasing the transmission voltage can reduce the current in the transmission cable, thereby reducing the heat generation of the cable conductor and reducing the energy loss of power. To increase the transmission voltage, it must be matched with high-voltage transmission. cable.

Due to the incomparable advantages of bare wires in terms of electrical performance, safety performance, and economic performance, overhead insulated cables gradually replace bare wires in power supply systems, and overhead insulated cables used in medium and high voltage transmission systems have a very broad market prospect. Most of the current high-voltage overhead insulated cables are below 35kV.

Utility model content

The purpose of the utility model is to provide a high voltage resistant overhead insulated cable, which can withstand high voltage above 35kV by optimizing the structure of the overhead insulated cable.

In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is: a high-voltage-resistant overhead insulated cable, including multiple insulated wire cores, and after the multi-strand insulated wire cores are twisted with the load-bearing steel core as the center of the circle, the high-density The insulated wire core includes a composite conductor, a composite insulation layer wrapped outside the composite conductor, and a high-density polyethylene inner sheath outside the composite insulation layer. The composite conductor is made of aluminum stranded wire and aluminum Alloy stranded wires are alternately distributed and twisted, aluminum stranded wires are formed by twisting multiple annealed aluminum wires, and the composite insulating layer includes an inner layer of polyvinyl chloride and an outer layer of cross-linked polyethylene.

Preferably, a rock wool rope filling layer is provided between adjacent insulated wire cores and between the high-density polyethylene inner sheath and the high-density polyethylene outer sheath.

Compared with the prior art, the beneficial effects of the utility model are:

The cooperation of the high-density polyethylene inner sheath and the high-density polyethylene outer sheath in the utility model can effectively improve the high-voltage resistance of the overhead insulated cable, and the composite conductor is formed by alternate distribution and twisting of aluminum alloy stranded wires and aluminum stranded wires Good conductivity and high strength, while the aluminum stranded wire is made of soft aluminum material, which has low resistance and better conductivity. The center of the insulated core is a load-bearing steel core. On the one hand, it can enhance the strength of the cable. On the other hand, It can be combined with the filled rock wool rope filling layer to ensure the roundness of the composite conductor, which is beneficial to the extrusion of the insulation layer, saves space, has a compact structure, and reduces eddy currents.

Description of drawings

Fig. 1 is a structural representation of the utility model.

Marks in the figure: 1. Insulated wire core, 2. High-density polyethylene outer sheath, 3. Aluminum stranded wire, 4. Aluminum alloy stranded wire, 5. High-density polyethylene inner sheath, 6. Cross-linked polyethylene layer , 7, PVC layer, 8, bearing steel core.

detailed description

Below in conjunction with the accompanying drawings, the utility model will be further described through specific embodiments.

Embodiment 1: As shown in the figure, a high-voltage-resistant overhead insulated cable includes a multi-strand insulated core 1 and a high-density polyethylene outer sheath 2, and the multi-strand insulated core 1 is twisted with each other with the load-bearing steel core 8 as the center of the circle , the insulated core 1 includes a composite conductor, a composite insulation layer covered by the composite conductor, and a high-density polyethylene inner sheath 5 outside the composite insulation layer, and the composite conductor is alternately distributed and twisted by aluminum strands 3 and aluminum alloy strands 4 The aluminum stranded wire 3 is formed by twisting a plurality of annealed aluminum wires. The composite insulation layer includes an inner layer of polyvinyl chloride layer 7 and an outer layer of cross-linked polyethylene layer 6. Between adjacent insulated wire cores 1 There is a rock wool rope filling layer between the inner sheath 5 of high-density polyethylene and the outer sheath 2 of high-density polyethylene.

Embodiment 2: A high-voltage-resistant overhead insulated cable, a high-voltage-resistant overhead insulated cable, including a multi-strand insulated core 1 and a high-density polyethylene outer sheath 2, and the multi-strand insulated core 1 is centered on a load-bearing steel core 8 Twisted with each other, the insulated wire core 1 includes a composite conductor, a composite insulation layer covered by the composite conductor, and a high-density polyethylene inner sheath 5 outside the composite insulation layer, and the composite conductor is alternately composed of aluminum strands 3 and aluminum alloy strands 4 Distributed and stranded, the aluminum stranded wire 3 is formed by twisting a plurality of annealed aluminum wires, the composite insulation layer includes an inner layer of polyvinyl chloride layer 7 and an outer layer of cross-linked polyethylene layer 6, and the adjacent insulated wires There is a rock wool rope filling layer between the core 1 and between the high-density polyethylene inner sheath 5 and the high-density polyethylene outer sheath 2, and the high-density polyethylene inner sheath 5 and the high-density polyethylene outer sheath 2 There are respectively embedded backguys inside, through which a gap is torn between the high-density polyethylene inner sheath 5 and the high-density polyethylene outer sheath 2, so as to facilitate wiring.

Example 3: A high-voltage-resistant overhead insulated cable, a high-voltage-resistant overhead insulated cable, comprising a multi-strand insulated wire core 1 and a high-density polyethylene outer sheath 2, and the multi-strand insulated wire core 1 is centered on a load-bearing steel core 8 Twisted with each other, the insulated core 1 includes a composite conductor, a composite insulation layer covered by the composite conductor, and a high-density polyethylene inner sheath 5 outside the composite insulation layer, and the high-density polyethylene inner sheath 5 is provided with a cable The phase-separated color strips arranged in the length direction protrude from the high-density polyethylene inner sheath 5, and the number of phase-separated color strips on each strand of insulated wire core 1 is different, so as to distinguish the phase sequence, composite The conductor is formed by alternately distributing and twisting aluminum strands 3 and aluminum alloy strands 4. The aluminum strands 3 are formed by twisting a plurality of annealed aluminum wires. The composite insulating layer includes an inner layer of polyvinyl chloride layer 7 and an outer layer of The cross-linked polyethylene layer 6 is provided with a rock wool rope filling layer between adjacent insulated wire cores 1 and between the high-density polyethylene inner sheath 5 and the high-density polyethylene outer sheath 2, and the high-density polyethylene The inner sheath 5 and the outer high-density polyethylene sheath 2 are respectively buried with pull wires, and a gap is torn between the inner high-density polyethylene sheath 5 and the outer high-density polyethylene sheath 2 through the pull wires, so as to facilitate wiring.

The cooperation of the high-density polyethylene inner sheath and the high-density polyethylene outer sheath in the utility model can effectively improve the high-voltage resistance of the overhead insulated cable, and the composite conductor is formed by alternate distribution and twisting of aluminum alloy stranded wires and aluminum stranded wires Good conductivity and high strength, while the aluminum stranded wire is made of soft aluminum material, which has low resistance and better conductivity. The center of the insulated core is a load-bearing steel core. On the one hand, it can enhance the strength of the cable. On the other hand, It can be combined with the filled rock wool rope filling layer to ensure the roundness of the composite conductor, which is beneficial to the extrusion of the insulation layer, saves space, has a compact structure, and reduces eddy currents.

The above are only preferred embodiments of the present utility model. Apparently, the utility model is not limited to the above embodiments, and many variations are possible. All deformations that a person skilled in the art can derive or associate directly from the content disclosed in the utility model shall be considered as the protection scope of the utility model.

Claims (2)

1. A high-voltage-resistant overhead insulated cable, including multi-strand insulated wire cores (1), characterized in that: after the multi-strand insulated wire cores (1) are twisted with the load-bearing steel core (8) as the center of the circle, they are made of high-density polymer The outer sheath (2) is coated with vinyl, and the insulated core (1) includes a composite conductor, a composite insulation layer wrapped outside the composite conductor, and a high-density polyethylene inner sheath (5) outside the composite insulation layer, The composite conductor is formed by alternate distribution and twisting of aluminum strands (3) and aluminum alloy strands (4), the aluminum strands (3) are formed by twisting multiple annealed aluminum wires, and the composite insulation layer includes polychloride A layer of vinyl (7) and an outer layer of cross-linked polyethylene (6). 2. A high-voltage-resistant overhead insulated cable according to claim 1, characterized in that: between adjacent insulated cores (1) and between the high-density polyethylene inner sheath (5) and the high-density polyethylene outer sheath A rock wool rope filling layer is arranged between the sheaths (2).