CN204332516U - A high-performance creep-resistant aluminum alloy power cable - Google Patents

Abstract

The utility model discloses high-performance creep resistant aluminium alloy power cable, comprise the single aluminium alloy conductor of drawing, stranded aluminium alloy conductor, every root stranded conductor extrudes screen-silane crosslinked insulating layer-semiconductive shielding layer, wrapped copper strip shielding layer, form shielded conductor unit, every root shielded conductor unit, through stranded formation cable core unit, comprises filler and is coated on the non-hygroscopic fire proofing on cable core unit, cable core unit carries out interlocking armouring, and outermost layer extrudes oversheath.The utility model is the creep-resistant property that the aluminium alloy core arrangement mode by adopting original creation, stranded mode and heat treatment mode improve aluminium alloy stranded conductor.

Description

A high-performance creep-resistant aluminum alloy power cable

technical field

The utility model relates to a cable, in particular to an aluminum alloy power cable.

Background technique

Power cables are power lines used in power transmission and distribution systems for civil, commercial, industrial, large-scale venues, entertainment venues, mines, subways and other places. Due to the serious shortage of domestic copper resources, the price of copper is increasing day by day, and it is heavily dependent on copper resources. In order to survive and develop, the current cable industry has to find new metal conductors to replace copper conductors. The electrical conductivity of aluminum is second only to copper, and China is an aluminum-rich country. Choosing aluminum instead of copper is the common choice of many cable companies, but the conductor of a pure aluminum core cable will cause structural relaxation due to temperature changes, and the pure aluminum core The tensile strength and elongation are small, so it is not suitable for long-distance laying and overhead laying. The present application is a utility model improvement based on the above-mentioned background.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a convenient installation and laying, and good electrical conductivity, creep resistance and corrosion resistance, suitable for various high-risk installations such as subways, large buildings, and residential areas. High-performance power cables installed and used in places.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a high-performance creep-resistant aluminum alloy power cable, including a twisted cable core unit, including a shielded conductor unit and a non-hygroscopic flame-retardant type cable core unit. Filler, the cable core unit is extruded with the outer sheath, and the cable core unit and the outer sheath are covered with non-hygroscopic flame-retardant tape and interlocking armor layer in sequence from the inside to the outside, and the shielded conductor unit is from the inside to the outside In turn, it includes the aluminum alloy stranded conductor, the shielding layer extruded on the aluminum alloy stranded conductor, the silane cross-linked insulating layer extruded on the shielding layer, the semi-conductive shielding layer extruded on the insulating layer, and the semi-conductive shielding layer extruded on the insulating layer. A shield of copper tape wrapped over a conductive shield; an aluminum alloy stranded conductor consisting of a single aluminum alloy core.

Due to the application of the above scheme, the utility model patent has the following advantages compared with the existing patents:

1. Due to the use of aluminum alloy conductor and aluminum alloy tape armor layer, not only the weight of the cable is small, but also the burden on the building can be reduced, and its tensile strength and ability to resist external damage are increased by more than 300% compared with ordinary aluminum alloy cables. Can be laid over long distances;

2. Since the single aluminum alloy core will be twisted and bent with the rotation of the twisted cage during stranding, resulting in deformation of the single aluminum alloy core, the use of cradle-type frame stranding equipment to produce stranded conductors can effectively correct the conductors during the stranding process. The single aluminum alloy core is twisted continuously, so that the single aluminum alloy core conductor will not be twisted and deformed due to long-term stranding, thus ensuring the quality of the stranded conductor;

3. Anneal the stranded aluminum alloy stranded conductor to make it reach a certain softness; adopt advanced metal heat treatment technology to properly soften the tightly pressed stranded aluminum alloy conductor and improve the elongation of the conductor , creep resistance and bending performance of cables;

4. It adopts double-layer aluminum alloy belt interlocking armor, and the unique ring-shaped concave-convex closed structure improves the ability to resist strong destructive forces from the outside. The interlocking interlocking structure makes the cable easy to bend during laying and installation, and the aluminum alloy belt weighs far Far smaller than the steel belt, it not only maintains the original superior performance of the steel belt armor, but also reduces the weight. There is no need to use a bridge during installation, which greatly reduces the difficulty of installation and reduces the installation cost.

5. Low manufacturing cost. In the case of the same electrical performance as copper cables, the price of aluminum alloy cables is about 15%-20% lower than that of ordinary copper cables, and the price is 20%-25% lower than that of copper cables using Class A flame-retardant materials, and the safety performance is much higher. Higher than copper cables using A flame retardant materials;

6. Low construction cost. The weight of aluminum alloy cable is less than half of that of copper cable. It does not need to build a steel frame for support or only needs to build a small steel frame to complete the installation. It is easy to install and the installation cost is about 30% less than that of copper cable;

7. Aluminum resources, the main material of aluminum alloy materials, are the most abundant metal elements in the earth’s crust, with a content of more than 7%. my country’s copper resources are scarce and its demand ranks first in the world. The annual copper imports exceed 70% of the total consumption. %. The weight of aluminum alloy cables is less than half that of copper cables, and its cross-section is only 1.1-1.5 times that of copper cables. The price is 15%-30% lower than that of ordinary copper cables. Using new aluminum alloy conductors instead of copper conductors can not only resolve the shortage of resources It can also save hundreds of billions of construction funds every year, which will have an immeasurable impact on creating a conservation-oriented society and country.

Description of drawings

Accompanying drawing 1 is a kind of power cable embodied in the technical solution of the utility model.

Among them: 1. Cable core unit,

11. Shielded conductor unit, 12. Non-hygroscopic, flame-retardant filler,

111, aluminum alloy stranded conductor, 112, shielding layer, 113, silane cross-linked insulating layer, 114, semi-conductive shielding layer, 115, copper tape shielding layer,

1111, single aluminum alloy core,

2. Non-hygroscopic, flame-retardant tape layer,

3. Interlocking armor layer,

4. Outer sheath.

Detailed ways

Below in conjunction with accompanying drawing, illustrate the concrete content of the present utility model in detail:

1. The power cable shown in Figure 1, the stranded cable core unit 1 includes a shielded conductor unit 11 and a non-hygroscopic flame-retardant filler 12, and the cable core unit 1 is extruded with an outer sheath 4. Between the cable core unit 1 and the outer sheath 4, the non-hygroscopic flame-retardant tape 2 and the interlocking armor layer 3 are sequentially covered from the inside to the outside, and the characteristic is that: the shielded conductor unit 11 is from the inside to the outside. The outer layer includes an aluminum alloy stranded conductor 111, a shielding layer 112 extruded on the aluminum alloy stranded conductor 111, a silane cross-linked insulating layer 113 extruded on the shielding layer 112, and a semi-conductor extruded on the insulating layer 113. Conductive shielding layer 114, a copper tape shielding layer 115 wrapped on the semi-conductive shielding layer 114; the aluminum alloy stranded conductor 111 includes a single aluminum alloy core 1111;

2, manufacture the method for the utility model, comprise the following steps:

(1) Select an alloy aluminum rod added with iron, silicon, copper, magnesium, zinc, boron and other trace elements to draw it into a circular aluminum alloy core with the same diameter;

(2) Arrange the circular aluminum alloy cores in a 1+3n(n-1) manner, and twist the arranged multiple circular aluminum alloy cores. Stranding method, and the stranding direction of adjacent layers should be opposite. The stranded aluminum alloy conductors are pressed layer by layer through a set of compression dies, and the stranded aluminum alloy conductors are annealed to make them reach a certain level. softness; because the circular aluminum alloy core will twist and bend with the rotation of the twisted cage during stranding, resulting in deformation of the circular aluminum alloy core, the use of cradle-type frame twisting equipment to produce aluminum alloy stranded conductors can effectively twist The circular aluminum alloy core is constantly back and twisted during the bonding process, so that the circular aluminum alloy core will not be twisted and deformed due to long-term stranding, thereby ensuring the quality of the aluminum alloy stranded conductor;

(3) Using three-layer co-extrusion technology, the conductive shielding layer, silane cross-linked insulating layer, and semi-conductive shielding layer are extruded on the aluminum alloy stranded conductor at one time. The thickness of each extruded layer should be uniform, and the surface should be smooth and free of Defects and pre-crosslinking are visible to the naked eye. The copper tape shielding layer is tightly wrapped outside the semi-conductive shielding layer. It is close and smooth, and no wrinkles or leakage are allowed; the stranded conductor is formed after extrusion and wrapping shielded conductor unit;

(4) The shielded conductor unit is twisted into a cable core unit by a cable forming machine, and the non-hygroscopic flame-retardant tape is overlapped on the cable core unit. In order to ensure the roundness of the cable core unit, the cable core unit should The unit is properly filled with non-hygroscopic and flame-retardant fillers. The stranded cable core unit should be properly tight, and the wrapping tape should be tightly wrapped on the cable core. The overlapping width of the wrapping tape should not be less than 15% of the bandwidth. The cable core after tape should be round and full;

(5) The double-layer aluminum alloy tape is coated on the cable core unit by a chain armoring machine to form a chain armor layer. The unique ring-shaped concave-convex closed structure improves the ability to resist strong destructive forces from the outside. The interlocking chain structure The cable is easy to bend during laying and installation. The weight of the aluminum alloy strip is much smaller than that of the steel strip, which not only maintains the original superior performance of the steel strip armor, but also reduces the weight. There is no need to use a bridge during installation, which greatly reduces the difficulty of installation. , reducing installation costs.

(6) Extrude an environmentally friendly outer sheath material (including halogen-free polyolefin, thermoplastic low-smoke halogen-free flame-retardant polyolefin material) on the armored cable core through a set of extrusion dies.

The conductor of a high-performance creep-resistant aluminum alloy power cable of the utility model is a group of aluminum alloy materials processed by a special process. Its electrical conductivity is second only to copper conductors, and its tensile strength and elongation are far superior to pure aluminum. Satisfying long-distance laying; aluminum alloy conductor not only has excellent corrosion resistance, rich base material aluminum resources, and low price, these advantages are not available in copper; aluminum alloy cables are light in weight and easy to lay and install, so aluminum alloy is the most ideal in the future A metallic material that replaces copper conductors.

The specific embodiments of the utility model patent are illustrated and described above, but the utility model patent is not limited to the above examples. For example, the aluminum alloy single conductor is not limited to a circle, and the conductor twisting arrangement is not limited to 1+3n(n- 1) method, the insulating material is not limited to silane cross-linking, and the insulating wire core is not limited to 3. All equivalent transformations made according to the utility model patent should be within the protection scope of the utility model patent.

Claims (3)

1. a high-performance creep resistant aluminium alloy power cable, comprise stranded cable core unit (1), shielded conductor unit (11) and non-hygroscopic flame retardant type filler (12) is comprised at cable core unit (1), cable core unit (1) extrudes oversheath (4), outwards non-hygroscopic inhibiting tape (2) and chain armour (3) is coated with successively from inner between cable core unit (1) and oversheath (4), it is characterized in that: comprise successively from the inside to surface in described shielded conductor unit (11) containing aluminium alloy stranded conductor (111), the screen (112) that aluminium alloy stranded conductor (111) extrudes, the silane crosslinked insulating layer (113) that screen (112) extrudes, the semiconductive shielding layer (114) that insulating barrier (113) extrudes, at the upper wrapped copper strip shielding layer (115) of semiconductive shielding layer (114), aluminium alloy stranded conductor (111) comprises single aluminium alloy core (1111).

2. high-performance creep resistant aluminium alloy power cable according to claim 1, it is characterized in that: described single aluminium alloy core (1111) arranges by 1+3n (n-1) mode, and single aluminium alloy core (1111) direction of lay of adjacent layer is contrary.

3. high-performance creep resistant aluminium alloy power cable according to claim 1, it is characterized in that: described shielded conductor unit (11) twisted synthesizing cable core unit (1), at the upper fire-retardant band of the overlapping wrapped non-hygroscopic (2) of cable core unit (1), time stranded, non-hygroscopic, flame retardant type filler (12) should be filled in cable core unit (1).