Product Description
The irregular wire steel core aluminum conductor is a composite overhead conductor optimized through structural innovation, with a core design of a concentric twisted structure of "irregular aluminum conductive layer+high-strength steel core". It breaks through the structural limitations of traditional round wire steel core aluminum stranded wire (ACSR), using non-circular cross-section aluminum single wire stranded outer conductors such as trapezoidal and fan-shaped sections. With the same outer diameter, it can increase the aluminum conductive cross-sectional area by 7% -10% while retaining the high-strength support advantage of the steel core.
Enhanced core: high-strength steel core layer.Located at the center of the wire, it is usually made up of 1, 7, or 19 strands of coated steel wire twisted together, and is the core source of the wire's mechanical strength. Steel core coating can be selected according to environmental requirements, including traditional galvanized coating, high-strength zinc aluminum alloy coating, etc.
Conductive layer: twisted layer of irregular aluminum wire.Concentric layer twisting is used to arrange around the steel core, with trapezoidal aluminum monofilament cross-section as the main design. Some specifications adopt fan-shaped or Z-shaped design, and the dimensional tolerance is controlled within ± 2% through special mold drawing.
Overall characteristics.The finished product has a regular circular cross-section, with tightly fitted irregular aluminum wires and no obvious gaps; Most specifications undergo compression treatment to further reduce the outer diameter, combining structural compactness and surface smoothness, which can reduce wind loads and the risk of ice and snow accumulation..
High space utilization and current carrying capacity.
Excellent mechanical strength and span adaptability.
Low loss and anti-interference characteristics.
Strengthen corrosion resistance and environmental adaptability.
DC resistance: Thanks to a larger conductive cross-sectional area, the resistance is 10% -15% lower than that of circular wire ACSR under the same outer diameter.
Current carrying capacity: In a windless environment at 25 ℃, the current carrying capacity of 240mm ² specification can reach 465A, and the current carrying capacity of 400mm ² specification can reach 660A.
Corona characteristics: Under 220kV voltage, the corona loss is ≤ 1.2W/m on sunny days and ≤ 2.5W/m on rainy days, which is much lower than the circular wire ACSR, reducing energy waste and electromagnetic interference.
Installation temperature: Recommended construction temperature -15 ℃~40 ℃. The brittleness of irregular aluminum wire slightly increases in low-temperature environments, and it is necessary to avoid severe bending. The bending radius should be ≥ 20 times the outer diameter of the wire.
Tension control: The construction tension shall not exceed 40% of the minimum failure load, and the tensioning shall be carried out in stages to avoid impact load damage to the aluminum layer.
Diameter measurement: It needs to be carried out between the closed mold of the twisting machine and the winch to ensure that the outer diameter accuracy meets the design requirements.
Urban power grid upgrade and renovation: In the 110kV-220kV urban transmission line, the small outer diameter characteristic is suitable for narrow roads and dense tower environments, which can increase the current carrying capacity by 20% without replacing towers, solving the problem of increasing urban electricity load.
High load industrial park power transmission: 35kV-110kV industrial park trunk lines use this conductor, which can meet the high-power electricity demand of large equipment with high current carrying capacity and low loss characteristics to reduce enterprise electricity costs.
Ultra high voltage crossing project: The 330kV-500kV line crossing rivers and canyons adopts MA3 high-strength steel core specifications, which combines long span capability and low corona loss, reducing the construction cost of crossing towers.
|
Nominal Cross Section |
Number of Conductors/Single Wire Diameter |
Conductor Structure |
First Layer |
|
Second Layer |
Third Layer |
Fourth Layer |
Control Cross Section (mm²); |
Weight per Meter |
Standard resistance |
Resistance before annealing |
|||
|
mm |
Reference mold |
Pitch |
Reference mold |
Pitch |
Reference mold |
Pitch |
Reference mold |
Pitch |
≤g/m |
≤Ω/km |
≤Ω/km |
|||
|
10 |
7/1.34 |
1+6 |
3.8 |
65-75 |
|
|
|
|
|
|
9.3 |
25 |
3.08 |
3.1724 |
|
16 |
1.71 |
1+6 |
4.8 |
75-90 |
|
|
|
|
|
|
15.3 |
41 |
1.91 |
1.9673 |
|
25 |
7/2.11 |
1+6 |
6 |
90-110 |
|
|
|
|
|
|
24 |
65 |
1.2 |
1.236 |
|
35 |
7/2.54 |
1+6 |
7 |
110-130 |
|
|
|
|
|
|
33.5 |
91 |
0.868 |
0.894 |
|
50 |
10/2.54 |
2+8 |
7.9 |
120-140 |
|
|
|
|
|
|
45.5 |
123 |
0.641 |
0.6602 |
|
70 |
14/2.54 |
4+10 |
5.6 |
105-120 |
9.9 |
125-145 |
|
|
|
|
66.5 |
180 |
0.443 |
0.4541 |
|
95 |
19/2.54 |
1+6+12 |
7 |
130-145 |
11.5 |
150-170 |
|
|
|
|
91 |
247 |
0.32 |
0.3296 |
|
120 |
24/2.54 |
2+8+14 |
8.5 |
150-165 |
12.8 |
170-190 |
|
|
|
|
115 |
312 |
0.253 |
0.2606 |
|
150 |
30/2.54 |
4+10+16 |
5.7 |
120-140 |
9.8 |
155-170 |
14.4 |
180-205 |
|
|
142.5 |
386 |
0.206 |
0.2122 |
|
185 |
37/2.54 |
1+6+12+18 |
7 |
150-165 |
11.5 |
175-190 |
16 |
205-235 |
|
|
179 |
485 |
0.164 |
0.1689 |
|
240 |
48/2.54 |
3+9+15+21 |
10 |
190-210 |
14.2 |
215-235 |
18.4 |
242-270 |
|
|
235 |
637 |
0.125 |
0.1288 |
|
300 |
61/2.54 |
1+6+12+18+24 |
7 |
160-175 |
11.6 |
215-235 |
16.3 |
240-260 |
20.4 |
260-290 |
294 |
797 |
0.1 |
0.103 |
|
400 |
61/2.88 |
1+6+12+18+24 |
8.3 |
170-185 |
13.5 |
245-265 |
18.5 |
280-300 |
23.4 |
300-350 |
376 |
1019 |
0.0778 |
0.0801 |
|
500 |
61/3.23 |
1+6+12+18+24 |
9.5 |
200-235 |
14.8 |
260-280 |
20.6 |
310-330 |
26.4 |
330-388 |
486 |
1317 |
0.0605 |
0.0623 |
|
630 |
61/3.66 |
1+6+12+18+24 |
10.6 |
220-250 |
17.2 |
330-350 |
23.6 |
360-380 |
29.8 |
380-450 |
618 |
1675 |
0.0469 |
0.0483 |
|
Process Requirements: 1. Conduct mutual inspection of the conductors drawn in the previous process to avoid using the wrong single conductor. Pay attention to tension control during stranding to prevent the single conductor from being pulled too short, which would cause the conductor's DC resistance to exceed the standard. 2. The conductor structure, stranding direction, and strand pitch should meet the process requirements. The stranding should be tight, with the outermost layer stranded to the left. Adjacent strands should have opposite stranding directions. The conductor surface should be smooth, flat, and free of oil stains, and should not have broken roots, cracks, or mechanical damage. 3. Soldering is permitted on single stranded conductors, but the distance between two joints within the same layer should be no less than 300mm, and the distance between two joints on the same single wire should be no less than 15mm. Joints should be smooth and rounded. 4. The stranding of the wires must be neat and uniform, and the outermost layer of the stranded wire should be at least 50mm from the edge of the spool. |
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