10kV cold-resistant tensile cross-linked polyethylene insulated overhead cable

Abstract

The invention relates to the technical field of aerial cables, and provides a 10kV cold-resistant tensile cross-linked polyethylene insulated aerial cable which comprises a conductor, an inner shielding layer, a cross-linked polyethylene insulating layer and an outer shielding layer are sequentially arranged outside the conductor in a wrapping mode, and the conductor is composed of a plurality of single wires twisted on the periphery of a metal reinforcing core. The cable further comprises a sheath layer, force-bearing positioning rings and accumulated snow removing assemblies, the sheath layer is arranged outside the outer shielding layer, the force-bearing positioning rings are arranged outside the sheath layer at intervals, the accumulated snow removing assemblies are arranged between every two adjacent force-bearing positioning rings, and when accumulated snow exists on the sheath layer, the accumulated snow removing assemblies are automatically triggered in a windy environment, so that the accumulated snow removing assemblies are automatically removed. According to the technical scheme, the problems that in the prior art, when the overhead cable operates in a cold and severe environment, due to the influence of accumulated snow and ice coating, the overhead cable bears a large amount of tension, and the risk of frost heaving and cracking is increased are solved.

Description

Technical Field

[0001] This invention relates to the field of overhead cable technology, specifically to a 10kV cold-resistant and tensile-resistant cross-linked polyethylene insulated overhead cable. Background Technology

[0002] Overhead cable is an overhead conductor with an insulation layer and a protective outer sheath. It is a new power transmission method between overhead conductors and underground cables. According to its structure, overhead cables can be divided into hard aluminum wire structure, hard drawn copper wire structure, aluminum alloy wire structure, steel core or aluminum alloy core supported structure, and self-supporting three-core stranded structure, etc. Overhead insulated cables have the main characteristics of high power supply reliability, good power supply safety, convenient installation and maintenance, and reasonable economy. They are mainly used in telecommunications systems or power transmission.

[0003] Since power cables are generally overhead outdoors, their surfaces are easily covered with ice and snow due to environmental factors. This increases the vertical load on the cables, causing them to sag and putting a strain on the tensile strength of the cables and the load-bearing capacity of the towers. When the weight of the accumulated snow exceeds the cable's capacity, it can cause mechanical damage to the cables and even damage to the fittings. In particular, as snow accumulates, when it reaches a certain thickness or melts, it not only compresses the cables but also forms ice on them, increasing the likelihood of the cables swinging in strong winds. Furthermore, when the snow melts and then refreezes, it can cause repeated freezing and swelling of the tiny cracks inside the cable, further amplifying the damage and affecting the cable's lifespan and reliability. Summary of the Invention

[0004] This invention proposes a 10kV cold-resistant and tensile-strength cross-linked polyethylene insulated overhead cable to solve the problem in the prior art that when overhead cables are operated in cold and harsh environments, the effects of snow accumulation and icing cause them to bear a large amount of tensile force, increasing the risk of frost heave and cracking.

[0005] The technical solution of the present invention is as follows: A 10kV cold-resistant and tensile-strength cross-linked polyethylene insulated overhead cable includes a conductor, the conductor being sequentially covered with an inner shielding layer, a cross-linked polyethylene insulation layer, and an outer shielding layer. The conductor is composed of several single wires stranded around a metal reinforcing core. The cable also includes: The metal reinforcing core is used to support the weight of the cable itself and withstand a certain tensile force; Sheath layer: The outer shielding layer is provided with the sheath layer to protect the internal structure of the cable; A load-bearing positioning ring is provided, with several load-bearing positioning rings arranged at intervals on the outer side of the sheath layer; The load-bearing positioning ring can be configured as a split type for easy installation; The snow removal component is provided between every two adjacent load-bearing positioning rings. When there is snow on the sheath layer, the snow removal component is automatically triggered in windy conditions to remove the snow on the sheath layer.

[0006] Based on the aforementioned scheme, the sheath layer includes an inner sheath layer, a tensile interlayer, and an outer sheath layer. The outer shielding layer is sequentially covered by the inner sheath layer, the tensile interlayer, and the outer sheath layer. The tensile interlayer and the metal reinforcing core work together to resist the tensile force along the length of the cable.

[0007] Based on the aforementioned scheme, the tensile interlayer is formed by winding several foamed polyethylene strips, and each foamed polyethylene strip is provided with a tensile strip for resisting tensile forces.

[0008] Based on the aforementioned solution, the snow removal component includes: An elastic snow removal component is provided between every two load-bearing positioning rings; The positioning structure is provided on each of the load-bearing positioning rings to fix the position of the elastic snow removal component, but does not restrict the deformation of the elastic snow removal component itself.

[0009] Based on the aforementioned scheme, the positioning structure includes positioning posts. Two positioning posts are symmetrically and fixedly installed at the bottom of each load-bearing positioning ring. Each positioning post is provided with a snap-fit ​​ring groove. The two ends of the elastic snow removal component are respectively provided with fixing ropes for connecting with the positioning posts. The fixing ropes are connected to the snap-fit ​​ring grooves.

[0010] Based on the aforementioned scheme, the elastic snow removal component is composed of several spiral strips, and a gravity ball is fixedly installed at the connection position between every two spiral strips; The spiral strip is elastic.

[0011] Based on the aforementioned scheme, the portion of each spiral strip away from the gravity ball slides into contact with the outer sheath layer.

[0012] Based on the aforementioned scheme, each of the load-bearing positioning rings is coaxially provided with an arc-shaped groove, which is used to accommodate a special hook for the lifting line.

[0013] The working principle and beneficial effects of this invention are as follows: 1. In this invention, the metal reinforcing core serves to withstand tensile forces. Simultaneously, the tensile interlayer is composed of several foamed polyethylene tapes wound together, each tape containing a tensile strip designed to resist tensile forces. Through the action of the tensile strips, the tensile strips work in conjunction with the internal metal reinforcing core to form a distributed tensile structure, facilitating improved overall tensile strength. Furthermore, the foamed polyethylene tapes possess excellent thermal insulation properties, mitigating the impact of external low-temperature environments on the internal conductors. This ensures that the cross-linked polyethylene insulation layer and conductor within the cable maintain stable electrical performance, thereby enhancing overall tensile strength and cold resistance.

[0014] 2. In this invention, the gravity ball is located below the elastic snow removal component. When the gravity ball is affected by natural wind, the ball swings. At this time, the spiral strip extends and oscillates, thereby scraping the snow-covered part of the outer sheath layer through the inner side of the spiral strip, clearing away the snow, and preventing the snow from melting and causing icing, thus improving the cold resistance of the cable.

[0015] 3. In this invention, the combination of the sheath layer and the internal metal reinforcing core combines the central tensile strength with the distributed reinforcement structure, thereby improving the cable's ability to resist tensile forces. With the snow removal component, the snow is removed before it melts under the action of natural wind, thus avoiding the formation of ice and preventing repeated freezing and swelling damage to the cable. This not only reduces the tensile force on the cable but also improves the cable's cold resistance. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure from another angle in this invention; Figure 3 This is a schematic diagram of the structure of the conductor, inner shielding layer, cross-linked polyethylene insulation layer, outer shielding layer and sheath layer in this invention. Figure 4 This is a schematic diagram of the structure of the foamed polyethylene tape and tensile tape in this invention. Figure 5 This is a schematic diagram of the snow removal component in this invention; Figure 6 This is a schematic diagram of the elastic snow removal component in this invention; Figure 7 This is a schematic diagram of the positioning structure in this invention.

[0018] In the diagram: 1. Conductor; 101. Metal reinforcing core; 102. Single wire; 2. Inner shielding layer; 3. Cross-linked polyethylene insulation layer; 4. Outer shielding layer; 5. Load-bearing positioning ring; 6. Inner sheath layer; 7. Tensile interlayer; 701. Foamed polyethylene tape; 702. Tensile tape; 8. Outer sheath layer; 9. Elastic snow removal component; 901. Spiral strip; 902. Gravity ball; 10. Positioning post; 11. Snap-fit ​​ring groove; 12. Fixing rope; 13. Arc-shaped ring groove. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figures 1 to 7 As shown, this embodiment proposes a 10kV cold-resistant and tensile-resistant cross-linked polyethylene insulated overhead cable, including a conductor 1. The conductor 1 is sequentially covered with an inner shielding layer 2, a cross-linked polyethylene insulation layer 3, and an outer shielding layer 4. The conductor 1 is composed of several single wires 102 stranded around a metal reinforcing core 101. The metal reinforcing core 101 is set as a tensile-resistant load-bearing steel wire. The cable also includes a sheath layer, a load-bearing positioning ring 5, and a snow removal assembly. The metal reinforcing core 101 is used to support the weight of the cable itself and withstand a certain tensile force. The outer shielding layer 4 is provided with a sheath layer for protection. The internal structure of the cable simultaneously distributes the tensile force along the length of the cable. The sheath layer includes an inner sheath layer 6, a tensile interlayer 7, and an outer sheath layer 8. The outer shielding layer 4 is sequentially covered by the inner sheath layer 6, the tensile interlayer 7, and the outer sheath layer 8. The tensile interlayer 7 and the metal reinforcing core 101 work together to resist the tensile force along the length of the cable. The tensile interlayer 7 is made of several foamed polyethylene tapes 701 wound together. Each foamed polyethylene tape 701 has a tensile strip 702 inside to resist the tensile force. The tensile strip is a strip woven from high-strength synthetic fibers.

[0021] It should be noted that before constructing cables, the utility poles need to be built first. At this time, the terrain and features should be surveyed according to the design drawings to determine the pole positions at the starting point, turning points, and terminal points of the line. Finally, the positions of intermediate poles and reinforcing poles should be determined and marker stakes should be inserted. Then, the foundation pit should be excavated according to the surrounding environment and soil conditions, and then the utility poles should be installed (common pole erection methods include: crane pole erection, tripod pole erection, drop pole erection, and scaffolded pole erection; choose the appropriate pole erection method as needed). Then, crossarms should be installed on the utility poles. During the installation process, it is important to note that they should be installed on the load side, that is, in the opposite direction to the power supply. In addition, for branch poles, corner poles, and terminal poles, when installing crossarms, it is important to note that they should be installed on the side opposite to the conductor tension.

[0022] When laying cables, the cables are laid out and placed on crossarms. After the cables are laid out, the sag is adjusted to meet the design requirements using a tensioner. Then, at the tower, the cables are anchored using tension clamps or matching fixing hardware to ensure the reliability of the conductors. Then, load-bearing positioning rings 5 ​​are installed at certain intervals, and snow removal components are installed between every two adjacent load-bearing positioning rings 5 ​​until the cable laying is completed.

[0023] Furthermore, the installation of the metal reinforcing core 101 and the tensile interlayer 7 ensures that the cable itself has sufficient mechanical strength, meaning that the cable can be directly suspended from the crossarm of the utility pole. However, in situations with large spans or in environments with frequent strong winds, rain, or snow, suspension lines are needed to enhance the cable's load-bearing capacity in order to ensure the cable's safety. When suspension lines are required, they are first installed. The suspension lines (usually galvanized steel strand) are fixed to the utility pole using guy wire clamps, wedge clamps, and other hardware. (For long-distance lines, the suspension lines themselves also need support, with support points generally spaced no more than 15 meters apart.) After the cable is laid out, a special hook or binding wire (with a spacing of 0.5 to 1 meter, the actual spacing can be adjusted according to the actual situation) is used to suspend the cable from the suspension lines.

[0024] In order to facilitate the installation of the load-bearing positioning ring 5, the load-bearing positioning ring 5 can also be set as a split type. During installation, it can be spliced ​​on the outer sheath layer 8 and fixed by adhesive or other means to complete the installation of the load-bearing positioning ring 5.

[0025] Specifically, when there is snow on the cable, the presence of snow will increase the weight of the cable and generate additional tension. The melting of snow will also cause icing. At this time, under the action of wind, the cable will be subjected to lateral tension. The magnitude of wind load depends on factors such as wind speed, cable shape and medium density. In areas with high wind speed, especially when there is snow or ice on the outer sheath layer 8 of the cable, the wind load has a more obvious impact on the cable, thus applying excessive tension to the cable.

[0026] The metal reinforcing core 101 (i.e., tensile load-bearing steel wire, the diameter of which can be selected according to the environment) serves to withstand tensile forces. At the same time, the tensile interlayer 7, which is composed of several foamed polyethylene tapes 701 wound together, has a tensile strip 702 inside each foamed polyethylene tape 701 to resist tensile forces. Through the buffering effect of the foamed polyethylene tape 701, it can absorb external compression or impact and protect the internal cross-linked polyethylene insulation layer 3 and conductor 1. At the same time, through the action of the tensile strip 702, the tensile strip 702 works in conjunction with the internal metal reinforcing core 101 to form a distributed tensile structure, which facilitates the improvement of the overall tensile strength.

[0027] Furthermore, the foamed structure of the foamed polyethylene tape 701 gives it good flexibility, and the foamed polyethylene tape 701 also has good thermal insulation properties, thereby mitigating the impact of the external low temperature environment on the internal conductor 1 and ensuring that the cable maintains stable electrical performance.

[0028] By incorporating snow removal components, when snow accumulates on the outer sheath layer 8, the components activate under the influence of natural wind, scraping away the snow before it melts, thus preventing icing and improving the cable's cold resistance. Furthermore, the reduction in snow and ice reduces the impact of wind on the cable, alleviating tension. The suspension line, connected to the load-bearing positioning ring 5 via a dedicated hook or binding wire, not only enhances the cable's load-bearing capacity but also reduces the pressure exerted on the cable by the snow removal components.

[0029] like Figure 5 , Figure 6 , Figure 7 As shown, several load-bearing positioning rings 5 ​​are arranged at intervals on the outside of the sheath layer. A snow removal component is provided between every two adjacent load-bearing positioning rings 5. When there is snow on the sheath layer, the snow removal component is automatically triggered in a windy environment to remove the snow on the sheath layer. The snow removal component includes an elastic snow removal component 9 and a positioning structure. An elastic snow removal component 9 is provided between every two load-bearing positioning rings 5. A positioning structure is provided on each load-bearing positioning ring 5 to fix the position of the elastic snow removal component 9, but does not restrict the deformation of the elastic snow removal component 9 itself.

[0030] Specifically, when installing the elastic snow removal component 9, it is installed between two adjacent load-bearing positioning rings 5 ​​through the action of the positioning structure. This step is repeated until all the elastic snow removal components 9 are installed. When there is snow on the outer sheath layer 8, the elastic snow removal component 9 can be driven to move by the action of natural wind, thereby clearing the snow on the outer sheath layer 8.

[0031] like Figure 5, Figure 6 , Figure 7 As shown above, the positioning structure includes positioning posts 10. Each load-bearing positioning ring 5 has two positioning posts 10 symmetrically and fixedly installed at its bottom. Each positioning post 10 has a snap-fit ​​ring groove 11. The two ends of the elastic snow removal component 9 are respectively provided with fixing ropes 12 for connecting with the positioning posts 10. The fixing ropes 12 are connected to the snap-fit ​​ring grooves 11.

[0032] Specifically, when installing the elastic snow removal component 9, it is fitted onto the outer sheath layer 8 and positioned between two adjacent load-bearing positioning rings 5. At this time, the fixing ropes 12 at both ends of the elastic snow removal component 9 correspond to the positioning posts 10 at the bottom of the two load-bearing positioning rings 5, respectively. Then, the fixing ropes 12 are wound around and installed on the snap ring grooves 11 on the corresponding positioning posts 10.

[0033] like Figure 5 , Figure 6 , Figure 7 As shown above, the elastic snow removal component 9 consists of several spiral strips 901. The spiral strips 901 are made of elastic materials, such as engineering plastics. The spiral strips 901 are elastic. A gravity ball 902 is fixedly installed at the connection position between every two spiral strips 901. The part of each spiral strip 901 away from the gravity ball 902 slides against the outer sheath layer 8. Each load-bearing positioning ring 5 has an arc-shaped ring groove 13 coaxially formed on it. The arc-shaped ring groove 13 is used to accommodate a special hook for the suspension line.

[0034] Specifically, after the elastic snow removal component 9 is installed, the gravity ball 902 is located below the elastic snow removal component 9. When the gravity ball 902 is affected by natural wind, the ball swings, and the spiral strip 901 extends, retracts and swings. This causes the inner side of the spiral strip 901 to scrape the snow-covered parts of the outer sheath layer 8, clearing away the snow and preventing icing after the snow melts, thereby improving the cold resistance of the cable.

[0035] The working principle or usage process of this application is as follows: When there is snow on the cable, the presence of snow will increase the weight of the cable and generate additional tension. The melting of snow will also cause icing. At this time, under the action of wind, the cable will be subjected to lateral tension. The magnitude of wind load depends on factors such as wind speed, cable shape and medium density. In areas with high wind speed, especially when there is snow or ice on the outer sheath layer 8 of the cable, the wind load has a more obvious effect on the cable, thus applying excessive tension to the cable.

[0036] At this point, the metal reinforcing core 101 serves to withstand tensile force. Simultaneously, the tensile-resistant interlayer 7, composed of several foamed polyethylene tapes 701 wound together, with each tape 701 containing a tensile-resistant strip 702 to resist tensile force, absorbs external compression or impact through its buffering effect, protecting the internal cross-linked polyethylene insulation layer 3 and conductor 1. Furthermore, the tensile-resistant strip 702 works in conjunction with the internal metal reinforcing core 101 to form a distributed tensile structure, improving overall tensile strength. The foamed polyethylene tape 701 also possesses good thermal insulation properties, mitigating the impact of low external temperatures on the internal conductor 1 and ensuring stable electrical performance of the cable.

[0037] By incorporating the elastic snow removal component 9, when snow accumulates on the outer sheath layer 8, the gravity ball 902 is affected by natural wind, causing it to sway. Simultaneously, the spiral strip 901 extends and sways, scraping away the snow accumulation on the outer sheath layer 8 before it melts, thus preventing icing and improving the cable's cold resistance. Furthermore, the reduction in snow and ice reduces the impact of wind on the cable, alleviating tension. The suspension line, connected to the load-bearing positioning ring 5 via a dedicated hook or binding wire, not only enhances the cable's load-bearing capacity but also reduces the pressure exerted on the cable by the elastic snow removal component 9.

[0038] The above are merely preferred 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 10kV cold-resistant and tensile-resistant cross-linked polyethylene insulated overhead cable, comprising a conductor (1), wherein the conductor (1) is sequentially covered with an inner shielding layer (2), a cross-linked polyethylene insulation layer (3), and an outer shielding layer (4), characterized in that, The conductor (1) consists of several single wires (102) stranded around the outer periphery of a metal reinforcing core (101), and also includes: The metal reinforcing core (101) is used to support the weight of the cable itself and withstand a certain tensile force; Sheath layer, the outer shielding layer (4) is provided with the sheath layer outside, for protecting the internal structure of the cable; Load-bearing positioning rings (5), a plurality of load-bearing positioning rings (5) are arranged at intervals on the outside of the sheath layer; Snow removal assembly: A snow removal assembly is provided between every two adjacent load-bearing positioning rings (5). When there is snow on the sheath layer, the snow removal assembly is automatically triggered in a windy environment to remove the snow on the sheath layer.

2. The 10kV cold-resistant and tensile-strength cross-linked polyethylene insulated overhead cable according to claim 1, characterized in that, The sheath layer includes an inner sheath layer (6), a tensile interlayer (7), and an outer sheath layer (8). The outer shielding layer (4) is sequentially covered by the inner sheath layer (6), the tensile interlayer (7), and the outer sheath layer (8). The tensile interlayer (7) and the metal reinforcing core (101) work together to resist the tensile force along the length of the cable.

3. A 10kV cold-resistant and tensile-strength cross-linked polyethylene insulated overhead cable according to claim 2, characterized in that, The tensile interlayer (7) is formed by winding several foamed polyethylene strips (701), and each foamed polyethylene strip (701) is provided with a tensile strip (702) for resisting tensile force.

4. A 10kV cold-resistant and tensile-strength cross-linked polyethylene insulated overhead cable according to claim 3, characterized in that, The snow removal component includes: Elastic snow removal component (9), with the elastic snow removal component (9) provided between every two load-bearing positioning rings (5); The positioning structure is provided on each of the load-bearing positioning rings (5) to fix the position of the elastic snow removal component (9) but does not restrict the deformation of the elastic snow removal component (9).

5. A 10kV cold-resistant and tensile-strength cross-linked polyethylene insulated overhead cable according to claim 4, characterized in that, The positioning structure includes positioning posts (10). Each load-bearing positioning ring (5) has two positioning posts (10) symmetrically and fixedly installed at its bottom. Each positioning post (10) has a snap-fit ​​ring groove (11). The elastic snow removal component (9) has a fixing rope (12) at both ends for connecting with the positioning post (10). The fixing rope (12) is connected to the snap-fit ​​ring groove (11).

6. A 10kV cold-resistant and tensile-strength cross-linked polyethylene insulated overhead cable according to claim 5, characterized in that, The elastic snow removal component (9) is composed of several spiral strips (901), and a gravity ball (902) is fixedly installed at the connection position between every two spiral strips (901). The spiral strip (901) is elastic.

7. A 10kV cold-resistant and tensile-strength cross-linked polyethylene insulated overhead cable according to claim 6, characterized in that, The portion of each of the spiral strips (901) away from the gravity ball (902) slides into contact with the outer sheath layer (8).

8. A 10kV cold-resistant and tensile-strength cross-linked polyethylene insulated overhead cable according to claim 7, characterized in that, Each of the load-bearing positioning rings (5) is coaxially provided with an arc-shaped ring groove (13), which is used to accommodate a special hook for the suspension line.

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