High-altitude light overhead line

Abstract

The invention discloses a high-altitude light overhead line which comprises a conductor made of high-conductivity aluminum alloy, and the cross section of the conductor is in a low-speed wing shape. According to the invention, the inherent traditional thinking is broken through, the purpose of reducing the self weight is achieved by optimizing the material of the conductor, the conventional conductor section is innovatively optimized into a low-speed wing shape from a circular shape, and the conventional high-conductivity aluminum alloy material is combined, so that when the wire is used in an overhead manner, the self weight is reduced. The Bernoulli effect is utilized to generate lift force to counteract the self gravity of part of the overhead line, so that the safety of the line is enhanced; meanwhile, the low-speed wing section structure increases the superficial area of the conductor and is more beneficial to heat dissipation of the conductor, so that the current-carrying capacity of the line is increased, and the electric energy loss of the long-distance power transmission line is reduced.

Description

Technical Field

[0001] This invention relates to the field of wire and cable technology, and in particular to a lightweight overhead line for high-altitude applications. Background Technology

[0002] Overhead lines mainly refer to exposed overhead lines, erected above the ground. Insulators secure the transmission conductors to towers standing upright on the ground to transmit electrical energy. They are relatively easy to install and maintain, and have lower costs. Typically, the power conductors used in overhead lines have no insulating material covering their metal conductors; these are "bare wires," directly exposed to the air. This results in high heat dissipation efficiency, allowing for high current transmission. Furthermore, the lack of insulation and sheathing reduces the load on the towers and lowers the cost of the supporting structure. Bare wires also make it easy to observe broken strands, oxidation, and corrosion, facilitating inspection and maintenance. Overhead lines rely on air as the insulating medium and insulators to isolate the live conductors from the towers, achieving electrical insulation. Sufficient phase-to-phase and phase-to-ground distances must be maintained during installation to ensure safety.

[0003] Therefore, the weight of the overhead line itself plays a crucial role in the safety of the line and the theoretical design of the tower. The current mainstream approach is based on conductors with circular cross-sections. By optimizing the material of the conductor, the weight can be reduced, for example, by using aluminum alloy with high conductivity. However, due to limitations in material development, it is difficult to find a better optimization scheme to reduce the weight of overhead lines. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a lightweight overhead line for high-altitude use. The cross-section of the line is optimized into a low-speed airfoil. When used overhead, the Bernoulli effect is used to generate lift to offset part of the overhead line's own weight, thereby enhancing the safety of the line.

[0005] The technical solution to achieve the objective of this invention is: A lightweight overhead power line for high-altitude use includes a conductor made of a highly conductive aluminum alloy, the conductor having a low-speed airfoil cross-section.

[0006] Furthermore, the conductor includes a first conductor unit, a second conductor unit, and a locking part. The first conductor unit and the second conductor unit extend along the axial direction of the conductor and are fixed by the locking part along the cross-sectional length direction of the conductor.

[0007] Furthermore, the locking part is provided in at least two sets, distributed along the thickness direction of the conductor cross section and close to the outer surface of the conductor.

[0008] Furthermore, a slot is provided on either the first wire unit or the second wire unit, and a buckle adapted to the slot is provided on the other contact surface, the slot and the buckle forming the locking part.

[0009] Furthermore, a reinforcing core is provided at the center of the conductor.

[0010] Furthermore, the reinforcing core is a carbon fiber core.

[0011] Furthermore, the cross-section of the carbon fiber core is an elongated structure extending along the length direction of the conductor cross-section.

[0012] Furthermore, the carbon fiber core is wrapped with a protective layer made of nylon.

[0013] Furthermore, a monitoring optical fiber is embedded within the carbon fiber core.

[0014] By adopting the above technical solution, the present invention has the following beneficial effects: (1) This invention breaks away from the conventional thinking that the weight of the conductor is reduced by optimizing the material of the conductor. It innovatively optimizes the conventional conductor cross-section from a circle to a low-speed airfoil and combines it with the existing high-conductivity aluminum alloy material. When the conductor is used in the air, the Bernoulli effect is used to generate lift to offset part of the weight of the overhead line, thereby enhancing the safety of the line. At the same time, the cross-sectional structure of the low-speed airfoil increases the surface area of ​​the conductor, which is more conducive to the heat dissipation of the conductor, thereby increasing the current carrying capacity of the line and reducing the power loss of long-distance transmission lines.

[0015] (2) The present invention innovatively adopts a two-half structure design for the conductor and assembles it into a whole through a locking part, which solves the problem that conductors with low-speed airfoil cross sections cannot be produced by the traditional method of stranding multiple round conductors, thus realizing large cross section conductors.

[0016] (3) The present invention sets the locking part near the outer surface of the conductor and provides at least two sets along the conductor thickness direction, thereby ensuring the stability of the overall structure after the conductor is assembled.

[0017] (4) The present invention uses a snap-fit ​​and slot-fitting method to achieve the fixed assembly of the first conductor unit and the second conductor unit. The structure is simple, the assembly is convenient, and the assembly cannot be separated after the assembly is completed, thus ensuring the safety of the line.

[0018] (5) The present invention adds a carbon fiber core as a reinforcing core inside the conductor, thereby improving the overall tensile strength while minimizing the weight of the conductor itself. At the same time, the cross-section of the reinforcing core is set to be slender, so as to take into account the cross-sectional size, installation difficulty and distribution position of the reinforcing core inside the conductor, and achieve the optimal tensile effect.

[0019] (6) The present invention adds a protective layer of nylon material to the surface of the carbon fiber core, which has strong wear resistance and the nylon surface is smooth, which is conducive to the installation of the split conductor and avoids scratching the surface of the carbon fiber core and causing breakage.

[0020] (7) By adding a monitoring optical fiber inside the carbon fiber core, when the carbon fiber core breaks, the monitoring optical fiber will inevitably break, thereby monitoring the internal state of the carbon fiber core at all times, ensuring the safe and stable operation of the line, and improving the safety of use. Attached Figure Description

[0021] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein: Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] The labels in the attached diagram are: First conductor unit 1, second conductor unit 2, slot 3, buckle 4, reinforcing core 5, protective layer 6, optical fiber 7. Detailed Implementation

[0023] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0024] Example 1, as Figure 1 The lightweight overhead power line shown includes a conductor made of highly conductive aluminum alloy with a low-speed airfoil cross-section. By optimizing the conductor's structure, the weight is reduced. Breaking with traditional thinking, the conventional conductor cross-section is innovatively optimized from a circle to a low-speed airfoil. Combined with existing high-conductivity aluminum alloy materials, when the conductor is used overhead, the Bernoulli effect is used to generate lift to offset part of the overhead line's own weight, thereby enhancing the line's safety. At the same time, the low-speed airfoil cross-section structure increases the conductor's surface area, which is more conducive to heat dissipation, thereby increasing the line's current carrying capacity and reducing power loss in long-distance transmission lines.

[0025] Specifically, a low-speed airfoil refers to an airfoil profile shape that exhibits excellent aerodynamic performance under low-speed flight conditions. Common low-speed airfoils include NACA four-digit airfoils, NACA five-digit airfoils, and NACA laminar airfoils. This embodiment adopts a NACA four-digit airfoil, with a rounded leading edge that helps maintain airflow adhesion at high angles of attack. The trailing edge is sharp, allowing airflow to smoothly converge on the upper and lower surfaces. The straight line connecting the leading and trailing edges has a chord length of 50-150 mm, a maximum thickness of 8-16% of the chord length, and a maximum camber of 1-4% mm. The maximum camber refers to the maximum curvature of the mid-curve relative to the chord line. The mid-curve is the curve formed by connecting the midpoints of the upper and lower surfaces of the airfoil at various chordal positions. The upper surface bulges upward, creating a low-pressure area that provides the main lift, while the lower surface is relatively flat and slightly curved downward. For conductors with small nominal cross-sectional areas (e.g., 100 mm² to 240 mm²), the thickness-to-chord ratio of the airfoil should be designed to be 14-16%, and the maximum curvature should be 2.5-3%. For conductors with medium nominal cross-sectional areas (e.g., 300 mm² to 630 mm²), the thickness-to-chord ratio of the airfoil should be designed to be 12-14%, and the maximum curvature should be 2-2.5%. For conductors with large nominal cross-sectional areas (e.g., 800 mm² to 2000 mm²), the thickness-to-chord ratio of the airfoil should be designed to be 8-12%, and the maximum curvature should be 1-2%. Optimal results can be achieved by using appropriate low-speed airfoil shapes for conductors with different cross-sectional area sizes.

[0026] Because conductors with low-speed airfoil cross sections require a large aspect ratio, traditional circular aluminum wire stranded structures are completely unsuitable. Therefore, this embodiment innovatively adopts a two-half structure design for the conductor. Specifically, the conductor includes a first conductor unit 1, a second conductor unit 2, and a locking part. Both the first conductor unit 1 and the second conductor unit 2 extend along the axial direction of the conductor and are fixed by the locking part along the cross-sectional length direction of the conductor. Two sets of locking parts are provided, distributed along the thickness direction of the conductor cross section and close to the outer surface of the conductor. The mating surfaces of the first conductor unit 1 and the second conductor unit 2 are staggered with slots 3, and the other mating surface corresponding to the slots 3 is provided with buckles 4 that are adapted to the slots 3. The two sets of buckles 4 are respectively inserted into the corresponding slots 3 to form two sets of locking parts, resulting in a simple structure. First, conductor units of corresponding shapes are extruded using a mold that matches the shape of the two airfoil conductor halves, and then assembled by snap-fit. This not only facilitates assembly but also ensures that the assembled parts cannot be detached, guaranteeing circuit safety.

[0027] To improve the tensile strength of the conductor, a reinforcing core 5 is added to the center of the conductor in this embodiment. To balance tensile strength and conductor weight, a carbon fiber core is preferred as the reinforcing core 5, which has a high breaking strength and is lightweight. Due to the limitations of the conductor's cross-sectional shape, traditional circular cross-section reinforcing cores are not suitable. In this embodiment, the cross-section of the carbon fiber core is designed as a slender rectangular structure extending along the length of the conductor's cross-section, thereby balancing the cross-sectional size of the reinforcing core 5, the difficulty of installation, and its distribution position within the conductor, achieving optimal tensile strength.

[0028] Although carbon fiber is a high-tensile-strength material, its surface is easily scratched during the assembly of separate conductors, causing the carbon fiber to break. Therefore, in this embodiment, a layer of nylon material is extruded onto the surface of the carbon fiber core to form a protective layer 6. Nylon has strong wear resistance and a smooth surface, which is beneficial for the assembly of separate conductors.

[0029] To prevent internal damage to the carbon fiber core during processing, transportation, assembly, and operation, which could lead to breakage and safety hazards to overhead lines, this embodiment embeds an optical fiber 7 inside the carbon fiber core. A breakage in the carbon fiber core will inevitably cause the breakage of the optical fiber 7, thereby constantly monitoring the internal state of the carbon fiber and ensuring the safe and stable operation of the line.

[0030] The cable of this embodiment was subjected to wind tunnel lift testing, and the results are shown in Table 1: Table 1 .

[0031] This invention breaks away from the conventional thinking of reducing weight by optimizing the conductor material. It innovatively optimizes the conventional conductor cross-section from a circle to a low-speed airfoil. Combined with existing high-conductivity aluminum alloy materials, when the conductor is used overhead, the Bernoulli effect is used to generate lift to offset part of the overhead line's own weight, thereby enhancing the safety of the line. At the same time, the low-speed airfoil cross-section structure increases the conductor's surface area, which is more conducive to heat dissipation, thereby increasing the line's current carrying capacity and reducing power loss in long-distance transmission lines.

[0032] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lightweight overhead power line for high-altitude applications, characterized in that: It includes a conductor made of a highly conductive aluminum alloy, the conductor having a low-velocity airfoil cross-section.

2. The lightweight overhead power line for high-altitude use according to claim 1, characterized in that: The conductor includes a first conductor unit, a second conductor unit, and a locking part. The first conductor unit and the second conductor unit extend along the axial direction of the conductor and are fixed by the locking part along the cross-sectional length direction of the conductor.

3. A lightweight overhead power line for high-altitude use according to claim 2, characterized in that: The locking part is provided in at least two sets, distributed along the thickness direction of the conductor cross section and close to the outer surface of the conductor.

4. A lightweight overhead power line for high-altitude use according to claim 3, characterized in that: A slot is provided on either the first wire unit or the second wire unit, and a buckle adapted to the slot is provided on the other contact surface. The slot and the buckle form the locking part.

5. A lightweight overhead power line for high-altitude use according to any one of claims 1 to 4, characterized in that: The conductor has a reinforcing core at its center.

6. A lightweight overhead power line for high-altitude use according to claim 5, characterized in that: The reinforcing core is a carbon fiber core.

7. A lightweight overhead power line for high-altitude use according to claim 6, characterized in that: The cross-section of the carbon fiber core is a slender structure extending along the length of the conductor cross-section.

8. A lightweight overhead power line for high-altitude use according to claim 7, characterized in that: The carbon fiber core is wrapped with a protective layer made of nylon.

9. A lightweight overhead power line for high-altitude use according to claim 8, characterized in that: The carbon fiber core is embedded with a monitoring optical fiber.

Images