Large-section steel core heat-resistant aluminum alloy stranded wire

Abstract

The utility model discloses a large-section steel core heat-resistant aluminum alloy stranded wire, which comprises at least three layers of galvanized steel wire groups positioned in the middle and at least three layers of heat-resistant aluminum alloy wire groups positioned on the outer sides of the galvanized steel wire groups, comprising a first heat-resistant aluminum alloy wire group on the inner layer and at least two layers of second heat-resistant aluminum alloy wire groups on the outer side, one end of the cross section of each aluminum alloy wire of each second heat-resistant aluminum alloy wire group is provided with a convex part, the other end of each second heat-resistant aluminum alloy wire group is provided with a concave part, and the adjacent second heat-resistant aluminum alloy wire groups are twisted in opposite directions. The structure is tightly attached, and the heat resistance is good.

Description

Technical Field

[0001] The utility model relates to the technical field of power transmission, and particularly relates to a large-section steel-cored heat-resistant aluminum alloy stranded wire. Background Art

[0002] With the continuous and rapid development of China's national economy, the demand for electricity has also increased significantly. For this reason, various projects such as the west-east power transmission, north-south power supply, and national power grid connection have been launched respectively. For the existing transmission lines, since the cross-section of the conductors has been determined, there is a limit to the transmission capacity. With the change of the system operation mode, the demand for increasing the transmission capacity of the existing lines is increasing. The heat-resistant aluminum alloy shaped wire stranded wire has high heat-resistant characteristics, which allows the working temperature to be greatly increased, increases the current-carrying capacity, so as to increase the line transmission capacity. Especially for the transformation of old lines, due to limitations such as the wire erection height, span, and iron towers, the heat-resistant aluminum alloy shaped wire stranded wire can be used to achieve the purpose of capacity increase and expansion. However, in the prior art, the cross-section of the aluminum alloy wire is basically circular, and the fitting area between each conductor is small, the connection is unstable, and the stranded wire is likely to spread after being used in a harsh environment. Summary of the Utility Model

[0003] To solve the above technical problems, the utility model provides a large-section steel-cored heat-resistant aluminum alloy stranded wire with a tightly fitting structure and good heat-resistant performance.

[0004] The utility model adopts the following technical solutions:

[0005] A large-section steel-cored heat-resistant aluminum alloy stranded wire includes a galvanized steel wire group located in the middle and a heat-resistant aluminum alloy wire group located outside the galvanized steel wire group. The galvanized steel wire group has at least 3 layers, and the heat-resistant aluminum alloy wire group has at least 3 layers, including an inner first heat-resistant aluminum alloy wire group and an outer second heat-resistant aluminum alloy wire group. The second heat-resistant aluminum alloy wire group has at least two layers. One end of the cross-section of the aluminum alloy wire in the second heat-resistant aluminum alloy wire group has a convex portion, and the other end has a concave portion, and the stranding directions of adjacent second heat-resistant aluminum alloy wire groups are opposite.

[0006] Preferably, the convex portion is one of a rectangle, a semi-circle or a triangle, and the concave portion is one of a matching rectangle, a semi-circle or a triangle.

[0007] Preferably, the numbers of galvanized steel wires in the 3-layer galvanized steel wire group are 1, 6, and 12 respectively; the stranding pitch diameter ratio of the 6 galvanized steel wires in the middle layer of the 3-layer galvanized steel wire group is 16-26, and the stranding pitch diameter ratio of the 12 galvanized steel wires in the outer layer is 14-22.

[0008] Preferably, the stranding pitch diameter ratio of the outer galvanized steel wire group is less than or equal to the stranding pitch diameter ratio of the middle galvanized steel wire group.

[0009] Preferably, the pitch diameter ratios of the aluminum alloy wires in the two-layer second heat-resistant aluminum alloy wire group are 10 to 16 and 10 to 14.

[0010] Preferably, a hollow semi-conductive tape is provided outside the galvanized steel wire group.

[0011] Preferably, the first heat-resistant aluminum alloy wire group includes at least 15 aluminum alloy wires.

[0012] Preferably, the resistivity of the aluminum alloy wire in the heat-resistant aluminum alloy wire group at 20 °C: ≤ 28.735 nΩ•m.

[0013] Preferably, the tensile strength of the aluminum alloy wire in the heat-resistant aluminum alloy wire group: ≥ 157 MPa; the heat-resistant performance of the aluminum alloy wire: 230 °C × 1 h ≥ 90%.

[0014] Preferably, the tensile strength after stranding of the galvanized steel wire in the galvanized steel wire group: ≥ 1310 MPa; the 1% elongation stress of the galvanized steel wire: ≥ 1140 MPa; the elongation rate of the galvanized steel wire: ≥ 3.5%.

[0015] Compared with the prior art, the present utility model has the following advantages: The present utility model provides a large-section steel core heat-resistant aluminum alloy stranded wire, which includes a galvanized steel wire group located in the middle and a heat-resistant aluminum alloy wire group located outside the galvanized steel wire group. One end of the cross-section of the aluminum alloy wire in the second heat-resistant aluminum alloy wire group has a convex portion, and the other end has a concave portion, and the stranding directions of adjacent second heat-resistant aluminum alloy wire groups are opposite, and the structures are closely attached, and the heat-resistant performance is good. Description of the Drawings

[0016] Figure 1 It is a cross-sectional schematic diagram of a large-section steel core heat-resistant aluminum alloy stranded wire.

[0017] Figure 2 It is a cross-sectional schematic diagram of the second heat-resistant aluminum alloy wire group.

[0018] In the figure, galvanized steel wire group 1, heat-resistant aluminum alloy wire group 2, first heat-resistant aluminum alloy wire group 2-1, second heat-resistant aluminum alloy wire group 2-2, convex portion 2-2-1, concave portion 2-2-2, hollow semi-conductive tape 3, heat-resistant and flame-retardant material 4. Detailed Embodiments

[0019] In order to facilitate the understanding of the technical solution of the present utility model, the following is a detailed description in combination with the drawings and specific embodiments.

[0020] Embodiment 1: As Figure 1 shown, a large-section steel core heat-resistant aluminum alloy stranded wire includes a galvanized steel wire group 1 located in the middle and a heat-resistant aluminum alloy wire group 2 located outside the galvanized steel wire group 1;

[0021] The galvanized steel wire group 1 has three layers; the numbers of galvanized steel wires in the three layers of the galvanized steel wire group 1 are 1, 6, and 12 respectively; the stranding pitch diameter ratios of the 6 galvanized steel wires in the middle layer of the three layers of the galvanized steel wire group are 16 to 26, and the stranding pitch diameter ratios of the 12 galvanized steel wires in the outer layer are 14 to 22, and the stranding pitch diameter ratio of the outer galvanized steel wire group is less than or equal to that of the middle galvanized steel wire group;

[0022] As Figure 1-2 shown, the heat-resistant aluminum alloy wire group 2 has three layers; it includes the first heat-resistant aluminum alloy wire group 2-1 in the inner layer and the second heat-resistant aluminum alloy wire group 2-2 on the outer side; the first heat-resistant aluminum alloy wire group 2-1 includes at least 15 aluminum alloy wires; the second heat-resistant aluminum alloy wire group 2-2 has two layers, and one end of the cross-section of the aluminum alloy wires in the second heat-resistant aluminum alloy wire group 2-2 has a convex part 2-2-1, and the other end has a concave part 2-2-2, and the stranding directions of the adjacent second heat-resistant aluminum alloy wire groups 2-2 are opposite, for example, one layer is in the clockwise stranding direction and the other layer is in the counterclockwise stranding direction. The convex part 2-2-1 is one of a rectangle, a semicircle or a triangle, and the concave part 2-2-2 is one of a matching rectangle, a semicircle or a triangle. In this embodiment, taking the convex part 2-2-1 and the concave part 2-2-2 as triangles as an example, the convex part 2-2-1 of one aluminum alloy wire is embedded in the concave part 2-2-2 of the adjacent aluminum alloy wire, so that the stranding of each aluminum alloy wire is firmer and the stability of the overall stranded wire is improved.

[0023] The stranding pitch diameter ratios of the aluminum alloy wires in the two layers of the second heat-resistant aluminum alloy wire group 2-2 are 10 to 16 and 10 to 14, and the stranding pitch diameter ratio of the outer heat-resistant aluminum alloy wire group is less than or equal to that of the inner heat-resistant aluminum alloy wire group.

[0024] A hollow semi-conductive tape 3 is provided outside the galvanized steel wire group 1, and the hollow semi-conductive tape 3 can buffer and reduce the vibration energy transmission between the inner galvanized steel wire group 1 and the outer heat-resistant aluminum alloy wire group 2, and improve the self-damping performance of the conductor.

[0025] A heat-resistant and flame-retardant material 4 is filled between the galvanized steel wire group 1 and the hollow semi-conductive tape 3 to improve the overall heat-resistant and flame-retardant performance.

[0026] In this embodiment, the resistivity of the aluminum alloy wire of the heat-resistant aluminum alloy wire group 2 at 20 °C: ≤ 28.735 nΩ•m; the tensile strength of the aluminum alloy wire of the heat-resistant aluminum alloy wire group 2: ≥ 157 MPa; the heat-resistant performance of the aluminum alloy wire: 230 °C × 1 h ≥ 90%; the diameter of the aluminum alloy wire ± allowable deviation: 4.67 ± 0.05 mm.

[0027] In this embodiment, the tensile strength after stranding of the galvanized steel wires in the galvanized steel wire group 1: ≥ 1310 MPa; the 1% elongation stress of the galvanized steel wire: ≥ 1140 MPa; the elongation rate of the galvanized steel wire: ≥ 3.5%; the diameter of the galvanized steel wire ± allowable deviation: 2.80 ± 0.05 mm; the torsion of the galvanized steel wire: ≥ 16 times / 360°; the mass of the galvanized coating: ≥ 230 g / m 2 .

[0028] In this embodiment, the overall stranded wire outer diameter: 51.4 ± 0.5 mm; the DC resistance at 20°C: ≤ 0.0205 Ω / km; the rated breaking force of the stranded wire: ≥ 362.1 kN; the long-term heat resistance of the stranded wire (180°C × 400 h): ≥ 325.9 kN; the elastic modulus of the stranded wire: 66.6 GPa; the coefficient of linear expansion of the stranded wire: 21.2 × 10 -6 1 / °C.

[0029] In this embodiment, the softening starting temperature of the heat-resistant aluminum alloy wire is greater than 200°C, which is 100°C higher than that of the hard aluminum wire. The residual rate of the tensile strength during high-temperature use is greater than 90%, while that of the ordinary hard aluminum wire is only 60 - 70%.

[0030] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is subject to the scope defined by the claims. Several improvements and refinements made by those skilled in the art without departing from the spirit and scope of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A large-section steel-cored heat-resistant aluminum alloy stranded wire, characterized in that, It includes a galvanized steel wire group (1) located in the middle and a heat-resistant aluminum alloy wire group (2) located outside the galvanized steel wire group (1). The galvanized steel wire group (1) has at least 3 layers, and the heat-resistant aluminum alloy wire group (2) has at least 3 layers, including a first heat-resistant aluminum alloy wire group (2-1) in the inner layer and a second heat-resistant aluminum alloy wire group (2-2) located outside. The second heat-resistant aluminum alloy wire group (2-2) has at least two layers. One end of the cross-section of the aluminum alloy wire of the second heat-resistant aluminum alloy wire group (2-2) has a convex portion (2-2-1), and the other end has a concave portion (2-2-2), and the twisting directions of adjacent second heat-resistant aluminum alloy wire groups (2-2) are opposite.

2. The large-section steel-core heat-resistant aluminum alloy stranded wire according to claim 1, wherein The convex portion (2-2-1) is one of a rectangle, a semicircle or a triangle, and the concave portion (2-2-2) is one of a matching rectangle, a semicircle or a triangle.

3. The large-section steel-cored heat-resistant aluminum alloy stranded wire according to claim 1, wherein The numbers of galvanized steel wires in the 3-layer galvanized steel wire group (1) are 1, 6, and 12 respectively; the stranding pitch diameter ratio of the 6 galvanized steel wires in the middle layer of the 3-layer galvanized steel wire group is 16 to 26, and the stranding pitch diameter ratio of the 12 galvanized steel wires in the outer layer is 14 to 22.

4. The large cross-section steel core heat-resistant aluminum alloy stranded wire according to claim 3, characterized in that, The stranding pitch diameter ratio of the outer galvanized steel wire group is less than or equal to the stranding pitch diameter ratio of the middle galvanized steel wire group.

5. The large-section steel-core heat-resistant aluminum alloy stranded wire according to claim 1, wherein, The stranding pitch diameter ratios of the aluminum alloy wires in the two-layer second heat-resistant aluminum alloy wire group (2-2) are 10 to 16 and 10 to 14.

6. The large-section steel-core heat-resistant aluminum alloy stranded wire according to claim 1, wherein, A hollow semi-conductive tape (3) is provided outside the galvanized steel wire group (1).

7. The large cross-section steel-cored heat-resistant aluminum alloy stranded wire according to claim 1, wherein, A heat-resistant and flame-retardant material (4) is filled between the galvanized steel wire group (1) and the hollow semi-conductive tape (3).

8. The large cross-section steel core heat-resistant aluminum alloy stranded wire according to claim 1, characterized in that, The first heat-resistant aluminum alloy wire group (2-1) includes at least 15 aluminum alloy wires.

9. The large-section steel-core heat-resistant aluminum alloy stranded wire according to claim 1, wherein, The resistivity of the aluminum alloy wire of the heat-resistant aluminum alloy wire group (2) at 20 °C: ≤ 28.735 nΩ•m; the tensile strength of the aluminum alloy wire of the heat-resistant aluminum alloy wire group (2): ≥ 157 MPa; the heat-resistant performance of the aluminum alloy wire: 230 °C × 1 h ≥ 90%.

10. The large cross-section steel core heat-resistant aluminum alloy stranded wire according to claim 1, characterized in that, The post-stranding tensile strength of the galvanized steel wire of the galvanized steel wire group (1): ≥ 1310 MPa; the 1% elongation stress of the galvanized steel wire: ≥ 1140 MPa; the elongation rate of the galvanized steel wire: ≥ 3.5%.

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