CN204680405U - 800kV and above UHV transmission twisted wire - Google Patents

Abstract

The utility model discloses a kind of 800kV and above UHV transmission twisted wire, comprises the tension unit that is positioned at center and stranded the first duralumin conductive layer in tension unit outer surface, the second duralumin conductive layer, the first trapezoidal conductive layer and the second trapezoidal conductive layer successively; Described first trapezoidal conductive layer forms by 19 ~ 21 first trapezoidal aluminium single lines are stranded, to be that the second trapezoidal aluminium single line of isosceles trapezoid is stranded by 24 ~ 26 cross sections form second trapezoidal conductive layer, all having a cross section in described first trapezoidal aluminium single line, the second trapezoidal aluminium single line is circular copper conductor, described tension unit comprises the aluminium lamination by the stranded circular steel twisted wire of some steel wires and coated circular steel twisted wire outer surface, is filled with polyester gluing filling part in described aluminium lamination between some steel wires.The utility model reduces the effect of the AC impedance (resistance) that high order harmonic component produces, and under the prerequisite not improving cross section, improves transmission line capability, original corridor does not change steel tower substantially, reach increase-volume 68%, ampacity is large, quality is light, sag characteristic is good, extend the useful life of circuit.

Description

800kV and above UHV transmission twisted wire

technical field

The utility model relates to a transmission wire, in particular to an 800kV and above extra-high voltage transmission twisted wire.

Background technique

my country's national economy continues to grow at a high speed, and the demand for electricity is increasing. According to the plan of State Grid Construction Co., Ltd., in recent years, the focus will be on the construction of ±800kV and above UHV DC transmission lines. The construction of transmission lines requires conductors with larger cross-sections, but does not want the conductors to be affected by wind. For this reason, we have designed a special power transmission wire with a large cross-section and reduced wind resistance. The single-wire structure of traditional conductors is composed of circular single-wires. After the single-wires are twisted, they are greatly affected by high-altitude wind force, which causes the conductors to be subjected to great wind force, and the line tower is also subjected to great wind force. For conductors with small cross-sections , its function performance is not very obvious, but for the wire with a cross section of more than 1000, due to this defect, it cannot meet the requirements of large-capacity power transmission in the modern power grid. Therefore, it is necessary to develop a new type of wire to meet the development of my country's power industry. Need.

Contents of the invention

The utility model provides an 800kV and above UHV transmission twisted wire. The 800kV and above UHV transmission twisted wire reduces the AC impedance (resistance) generated by high-order harmonics, and improves the cross section without increasing the cross section. The power transmission capacity basically does not change the iron tower on the original corridor, and achieves a capacity increase of 68%. It has large carrying capacity, light weight, and good sag characteristics, which prolongs the service life of the line and meets the requirements of large-capacity power transmission in modern power grids.

In order to achieve the above purpose, the technical solution adopted by the utility model is: an 800kV and above UHV transmission stranded wire, including a tensile unit located in the center and a first duralumin conductive layer twisted on the outer surface of the tensile unit in sequence, The second hard aluminum conductive layer, the first trapezoidal conductive layer and the second trapezoidal conductive layer, the first trapezoidal conductive layer is located on the outer surface of the second hard aluminum conductive layer, and the second trapezoidal conductive layer is located outside the first trapezoidal conductive layer surface;

The tensile unit includes a circular steel strand twisted by several steel wires and an aluminum layer covering the outer surface of the circular steel strand, and polyester is filled in the aluminum layer and between the several steel wires Adhesive filling part;

The first duralumin conductive layer is formed by twisting 10 to 14 first round aluminum single wires with a circular cross section, and the second duralumin conductive layer is composed of 16 to 20 second round aluminum wires with a circular cross section. Shaped aluminum single wire twisted;

The first trapezoidal conductive layer is formed by twisting 19 to 21 first trapezoidal aluminum single wires with an isosceles trapezoidal cross section, and the second trapezoidal conductive layer is formed by twisting 24 to 26 second trapezoidal aluminum single wires with an isosceles trapezoidal cross section. The first trapezoidal aluminum single wire and the second trapezoidal aluminum single wire each have a circular copper wire with a cross-sectional area of the first trapezoidal aluminum single wire and the second trapezoidal aluminum single wire. 35~45% of that.

The technical scheme further improved in the above-mentioned technical scheme is as follows:

1. In the above scheme, the cross-sectional area of the tensile unit accounts for 9-12% of the total cross-sectional area of the wind pressure reducing wire.

2. In the above solution, the twisting direction of the first round aluminum single wire in the first duralumin conductive layer is rightward, and the twisting direction of the second round aluminum single wire in the second duralumin conductive layer is leftward.

3. In the above scheme, the thickness of the aluminum layer is 0.1~0.4mm; the diameter of the steel wire is 10mm~15mm.

Due to the application of the above-mentioned technical solutions, the utility model has the following advantages compared with the prior art:

1. For the 800kV and above UHV transmission stranded wire of the utility model, the first trapezoidal conductive layer is located on the outer surface of the second duralumin conductive layer, the second trapezoidal conductive layer is located on the outer surface of the first trapezoidal conductive layer, and the first trapezoidal aluminum Both the single wire and the second trapezoidal aluminum single wire have a circular copper wire with a cross-sectional area of 35-45% of the cross-sectional area of the first trapezoidal aluminum single wire and the second trapezoidal aluminum single wire The waist trapezoidal trapezoidal aluminum single wire is equipped with a circular copper wire to reduce the AC impedance (resistance) effect generated by high-order harmonics. Without increasing the cross-section, the transmission capacity is improved, which is basically no problem in the original corridor. Change the iron tower to achieve a 68% increase in capacity, large carrying capacity, light weight, and good sag characteristics, prolonging the service life of the line and meeting the requirements of large-capacity power transmission in modern power grids.

2. The 800kV and above UHV transmission stranded wire of the utility model includes a tensile unit located in the center and a first duralumin conductive layer, a second duralumin conductive layer, and a first trapezoidal The conductive layer and the second trapezoidal conductive layer, the first duralumin conductive layer is formed by twisting 10-14 first circular aluminum single wires with a circular cross-section, and the second duralumin conductive layer consists of 16-20 cross-sectional The first trapezoidal conductive layer is twisted from 19~21 first trapezoidal aluminum single wires, and the second trapezoidal conductive layer is made of 24~26 wires with the same cross section. The waist trapezoidal second trapezoidal aluminum single wire is stranded, the conductors designed and produced are extremely compact, the space utilization rate is as high as 93%, and the surface is smooth without unevenness, which greatly reduces the windward surface area of the conductors and produces the effect of reducing wind resistance.

3. The utility model 800kV and above UHV transmission strand, its tensile unit includes a circular steel strand twisted by several steel wires and an aluminum layer covering the outer surface of the circular steel strand. The polyester adhesive filling part is filled in the layer and between several steel wires, which makes the twisted tensile unit round, and is also conducive to fixing the twisting pitch, ensuring the advantage of keeping the bending diameter small for a long time.

Description of drawings

Accompanying drawing 1 is the structure schematic diagram of 800kV and above UHV transmission twisted wire of the utility model.

In the above drawings: 1. Tensile unit; 2. The first duralumin conductive layer; 21. The first round aluminum single wire; 3. The second duralumin conductive layer; 31. The second round aluminum single wire; 4. The first round aluminum single wire 1. Trapezoidal conductive layer; 41. First trapezoidal aluminum single wire; 5. Second trapezoidal conductive layer; 51. Second trapezoidal aluminum single wire; 6. Steel wire; 7. Round steel strand; 8. Aluminum layer; 9. Polyester Adhesive filling part; 10. Copper wire.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Embodiment 1: An 800kV and above UHV transmission stranded wire, including a tensile unit 1 located in the center and a first duralumin conductive layer 2 and a second duralumin conductive layer 3 twisted on the outer surface of the tensile unit 1 in sequence , the first trapezoidal conductive layer 4 and the second trapezoidal conductive layer 5, the first trapezoidal conductive layer 4 is located on the outer surface of the second duralumin conductive layer 3, and the second trapezoidal conductive layer 5 is located outside the first trapezoidal conductive layer 4 surface;

The tensile unit 1 includes a round steel strand 7 twisted by several steel wires 6 and an aluminum layer 8 covering the outer surface of the round steel strand 7, the aluminum layer 8 is located inside the several steel wires 6 is filled with polyester adhesive filling part 9;

The first duralumin conductive layer 2 is formed by twisting 10-14 first round aluminum single wires 21 with a circular cross-section, and the second duralumin conductive layer 3 is formed by twisting 16-20 first round aluminum single wires 21 with a circular cross-section. The second circular aluminum single wire 31 is stranded;

The first trapezoidal conductive layer 4 is formed by twisting 19 to 21 first trapezoidal aluminum single wires 41 with an isosceles trapezoidal cross section, and the second trapezoidal conductive layer 5 is formed by twisting 24 to 26 second trapezoidal aluminum wires with an isosceles trapezoidal cross section. The aluminum single wire 51 is twisted, and the first trapezoidal aluminum single wire 41 and the second trapezoidal aluminum single wire 51 each have a copper wire 10 with a circular cross section. , 35-45% of the cross-sectional area of the second trapezoidal aluminum single wire 51 .

The cross-sectional area of the tensile unit 1 accounts for 9% of the total cross-sectional area of the wind pressure reducing wire.

The twisting direction of the first round aluminum single wire 21 in the first duralumin conductive layer 2 is rightward, and the twisting direction of the second round aluminum single wire 31 in the second duralumin conductive layer 3 is leftward.

The thickness of the aluminum layer 8 is 0.15 mm; the diameter of the steel wire 6 is 12 mm.

Embodiment 2: An 800kV and above UHV transmission stranded wire, including a tensile unit 1 located in the center and a first duralumin conductive layer 2 and a second duralumin conductive layer 3 twisted on the outer surface of the tensile unit 1 in sequence , the first trapezoidal conductive layer 4 and the second trapezoidal conductive layer 5, the first trapezoidal conductive layer 4 is located on the outer surface of the second duralumin conductive layer 3, and the second trapezoidal conductive layer 5 is located outside the first trapezoidal conductive layer 4 surface;

The tensile unit 1 includes a round steel strand 7 twisted by several steel wires 6 and an aluminum layer 8 covering the outer surface of the round steel strand 7, the aluminum layer 8 is located inside the several steel wires 6 is filled with polyester adhesive filling part 9;

The first duralumin conductive layer 2 is formed by twisting 10-14 first round aluminum single wires 21 with a circular cross-section, and the second duralumin conductive layer 3 is formed by twisting 16-20 first round aluminum single wires 21 with a circular cross-section. The second circular aluminum single wire 31 is stranded;

The first trapezoidal conductive layer 4 is formed by twisting 19 to 21 first trapezoidal aluminum single wires 41 with an isosceles trapezoidal cross section, and the second trapezoidal conductive layer 5 is formed by twisting 24 to 26 second trapezoidal aluminum wires with an isosceles trapezoidal cross section. The aluminum single wire 51 is twisted, and the first trapezoidal aluminum single wire 41 and the second trapezoidal aluminum single wire 51 each have a copper wire 10 with a circular cross section. , 35-45% of the cross-sectional area of the second trapezoidal aluminum single wire 51 .

The cross-sectional area of the tensile unit 1 accounts for 11% of the total cross-sectional area of the wind pressure reducing wire.

The twisting direction of the first round aluminum single wire 21 in the first duralumin conductive layer 2 is rightward, and the twisting direction of the second round aluminum single wire 31 in the second duralumin conductive layer 3 is leftward.

The thickness of the aluminum layer 8 is 0.35 mm; the diameter of the steel wire 6 is 14 mm.

When the above-mentioned 800kV and above UHV transmission twisted wire is used, it can reduce the AC impedance (resistance) generated by high-order harmonics, increase the transmission capacity without increasing the cross-section, and basically do not change the iron tower in the original corridor , reaching a capacity increase of 68%, large carrying capacity, light weight, and good sag characteristics, which prolong the service life of the line and meet the requirements of large-capacity power transmission in modern power grids; secondly, the designed and produced wires are extremely compact, and the space utilization rate is as high as 93 %, the surface is smooth without unevenness, which greatly reduces the windward surface area of the wire and produces the effect of reducing wind resistance.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present utility model, and its purpose is to enable those familiar with this technology to understand the content of the present utility model and implement it accordingly, and not to limit the protection scope of the present utility model. All equivalent changes or modifications made according to the spirit of the utility model shall fall within the protection scope of the utility model.

Claims (4)

1. An 800kV and above UHV transmission stranded wire, characterized in that it includes a tensile unit (1) located in the center and a first duralumin conductive layer (2) twisted sequentially on the outer surface of the tensile unit (1) , the second duralumin conductive layer (3), the first trapezoidal conductive layer (4) and the second trapezoidal conductive layer (5), the first trapezoidal conductive layer (4) is located outside the second duralumin conductive layer (3) surface, the second trapezoidal conductive layer (5) is located on the outer surface of the first trapezoidal conductive layer (4); The tensile unit (1) includes a round steel strand (7) twisted by several steel wires (6) and an aluminum layer (8) covering the outer surface of the round steel strand (7). The above-mentioned aluminum layer (8) is filled with a polyester adhesive filling part (9) between several steel wires (6); The first duralumin conductive layer (2) is formed by twisting 10-14 first circular aluminum single wires (21) with a circular cross-section, and the second duralumin conductive layer (3) is formed by twisting 16-20 A second circular aluminum single wire (31) with a circular cross-section is stranded; The first trapezoidal conductive layer (4) is formed by twisting 19-21 first trapezoidal aluminum single wires (41) with isosceles trapezoidal cross-section, and the second trapezoidal conductive layer (5) is formed by twisting 24-26 first trapezoidal aluminum single wires (41) with isosceles trapezoidal cross-section. The second trapezoidal aluminum single wire (51) of the waist trapezoidal shape is twisted, and the first trapezoidal aluminum single wire (41) and the second trapezoidal aluminum single wire (51) each have a copper wire (10) with a circular cross section, The cross-sectional area of the copper wire (10) is 35-45% of the cross-sectional area of the first trapezoidal aluminum single wire (41) and the second trapezoidal aluminum single wire (51). 2. The 800kV and above UHV transmission stranded wire according to claim 1, characterized in that: the cross-sectional area of the tensile unit (1) accounts for 9-12% of the total cross-sectional area of the wind pressure reducing conductor. 3. The 800kV and above UHV transmission stranded wire according to claim 1, characterized in that: the twisting direction of the first round aluminum single wire (21) in the first duralumin conductive layer (2) is rightward, The twisting direction of the second circular aluminum single wire (31) in the second duralumin conductive layer (3) is leftward. 4. The 800kV and above UHV transmission stranded wire according to claim 1, characterized in that: the thickness of the aluminum layer (8) is 0.1~0.4mm; the diameter of the steel wire (6) is 10mm~15mm.