High strength copper core crosslinked polyethylene insulated aerial power cable

Abstract

This invention relates to the field of power cable technology and proposes a high-strength copper core cross-linked polyethylene insulated overhead power cable, comprising a conductor, a shielding layer, a cross-linked polyethylene insulation layer, and a sheathing layer. The conductor is composed of several stranded wires. The shielding layer covers the outside of the conductor, the cross-linked polyethylene insulation layer covers the outside of the shielding layer, and the sheathing layer covers the outside of the cross-linked polyethylene insulation layer. It also includes a tensile layer, positioning components, tensile components, and current-disrupting components. A tensile layer is provided between the cross-linked polyethylene insulation layer and the sheathing layer. Several positioning components are evenly spaced outside the sheathing layer. A tensile component is provided between every two positioning components. A current-disrupting component is installed on the tensile component. This technical solution solves the problem in the prior art where cables are prone to galloping due to weather conditions, which can easily lead to cable damage due to vibration or excessive tension, thus affecting the stability of the power system operation.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, specifically to a high-strength copper core cross-linked polyethylene insulated overhead power cable. Background Technology

[0002] Overhead cables are a type of overhead conductor with an insulation layer and a protective outer sheath. They are a special type of cable manufactured using a process similar to that of cross-linked cables. They represent a new power transmission method between overhead conductors and underground cables. Generally, overhead cables are single-core. According to their structure, they can be divided into hard aluminum wire structure, hard-drawn copper wire structure, aluminum alloy wire structure, steel core or aluminum alloy core support structure, and self-supporting three-core stranded structure, etc. Among them, the hard-drawn copper wire structure is heavier, but has greater tensile strength and stronger resistance to external forces. Even when the tower breaks, the cable can still continue to carry power.

[0003] With the continuous development of power systems, more and more transmission lines are being put into use. In power systems, cables are generally erected on iron towers. Tension towers and straight-line towers are two common types of transmission towers. Tension towers, also known as load-bearing towers or terminal towers, mainly function to bear the tension of the conductors and are usually used at key nodes of power lines, such as corners, branches, and terminals. Compared with tension towers, straight-line towers have a simpler structure and are mainly used for straight sections of power lines. Their function is to support the conductors and maintain the straightness of the line. In other words, a cable needs to be supported by multiple transmission towers.

[0004] During the application of overhead cables, power cables are prone to galloping due to natural disasters or excessive current carrying capacity. Galloping increases the vibration amplitude of the power cable and applies tension to the cable. This can easily damage the installation location of the overhead cable and transmission tower, as well as the cable sheath, due to excessive tension, thus affecting the stable operation of the power system. Summary of the Invention

[0005] This invention proposes a high-strength copper core cross-linked polyethylene insulated overhead power cable to solve the problem in the prior art where the cable is prone to galloping due to weather conditions, which can easily lead to cable damage due to vibration or excessive tension, thereby affecting the stability of the power system operation.

[0006] The technical solution of the present invention is as follows:

[0007] A high-strength copper-core cross-linked polyethylene insulated overhead power cable includes a conductor, a shielding layer, a cross-linked polyethylene insulation layer, and a sheathing layer. The conductor is formed by stranding several wires. The shielding layer covers the outside of the conductor. The cross-linked polyethylene insulation layer covers the outside of the shielding layer. The sheathing layer covers the outside of the cross-linked polyethylene insulation layer. The cable also includes:

[0008] A tensile layer is provided between the cross-linked polyethylene insulation layer and the sheath layer;

[0009] Positioning components: Several positioning components are evenly spaced on the outside of the sheath layer for fixing the cable to the transmission tower;

[0010] A tensile component is provided between every two positioning components, and both ends of the tensile component are respectively connected to the positioning component for tightening the cable;

[0011] A turbulence-dispersing component is installed on the tensile component to disperse wind acting on the cable.

[0012] Based on the aforementioned scheme, the outer side of the sheath layer is provided with several protruding strips, which are arranged in a circular shape at equal angles on the outer side of the sheath layer, and all of the protruding strips are arranged parallel to the conductor axis.

[0013] Based on the aforementioned solution, the positioning component includes:

[0014] Positioning frames, wherein a plurality of positioning frames are equally spaced on the outside of the sheath layer;

[0015] The positioning frame is configured as a split type, and each positioning frame has an arc-shaped positioning pad inside, which abuts against the sheath layer.

[0016] Based on the aforementioned solution, the tensile component includes:

[0017] The fixing frame is provided between every two adjacent positioning frames. Each set of fixing frames has several fixing frames arranged at equal distances. The inner side of each fixing frame abuts against the sheath layer, and the outer side of each fixing frame has several mounting holes opened at equal angles in a circumferential shape.

[0018] The fixing frame is configured as a split type;

[0019] Tension ropes are provided on the outside of each set of fixing frames. Each set of tension ropes is arranged in a circular shape with several ropes at equal angles. Several mounting holes on each fixing frame correspond one-to-one with multiple tension ropes. The tension ropes are in contact with the inner wall of the mounting holes.

[0020] The locking part is installed at the end of each set of tensile ropes to fix the tensile ropes.

[0021] Based on the aforementioned solution, the locking part includes:

[0022] The locking frame is provided at both ends of each of the tensile ropes, and the locking frame is fixedly connected to the corresponding positioning frame respectively;

[0023] Each of the tensile ropes has a bending area at one end inside the locking frame;

[0024] A bending frame is slidably installed inside each of the locking frames. The bending frame is located inside the bending area of ​​the tensile rope and abuts against the tensile rope.

[0025] The fastening frame is slidably installed inside each of the locking frames, and the fastening frame abuts against the tensile rope;

[0026] A locking member is installed on the top of each locking frame to fix the position of the fastening frame.

[0027] Based on the aforementioned scheme, the locking component includes a nut and a screw. Each locking frame is fixedly installed with the nut on its top, and each nut is threaded with the screw inside. Several screws correspond one-to-one with several fastening frames and are rotatably connected.

[0028] Based on the aforementioned solution, the turbulence-disrupting component includes:

[0029] Rotary sleeves, several sets of rotating sleeves are provided between every two adjacent fixed frames, and several sets of rotating sleeves correspond one-to-one with several tensile ropes, and several sets of rotating sleeves are respectively sleeved on the corresponding tensile ropes;

[0030] Each group of rotating sleeves has several sleeves arranged at equal intervals.

[0031] Based on the aforementioned scheme, each of the rotating sleeves is provided with a spiral air guide plate.

[0032] The working principle and beneficial effects of this invention are as follows:

[0033] 1. In this invention, the cable is fixed to the transmission tower by a positioning frame. By setting up the fixing frame and the anti-tension rope, when the overhead cable gallops, it can share part of the tension with the cable, reduce the external load on the cable, and the setting of several anti-tension ropes can also play a role in suppressing cable vibration, thereby reducing the occurrence of large-scale cable galloping and thus reducing the damage to the cable.

[0034] 2. In this invention, when the wind passes over the overhead cable, the strong wind acts on the spiral wind guide plate on the rotating sleeve. By setting the spiral wind guide plate, under the influence of severe weather, the rotating sleeve is driven to rotate on the tension rope, thereby dispersing the wind passing over the overhead cable, thus weakening the effect of the strong wind on the cable, and thus suppressing the occurrence of cable galloping.

[0035] 3. In this invention, the combination of positioning components and tensile components can not only share the tensile force borne by the cable and reduce the load on the cable, but also suppress large-scale cable galloping by cooperating with the protrusions on the sheath layer, thereby improving the overall strength and stability of the cable. By setting the turbulence-disrupting components, when the wind passes through the cable, it can weaken the wind acting on the cable, thereby further maintaining the stability of the cable. Attached Figure Description

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0037] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0038] Figure 2 This is a schematic diagram of the structure in which the tensile component and the flow-disrupting component work together in this invention;

[0039] Figure 3 This is a schematic diagram of the structure of the conductor, shielding layer, cross-linked polyethylene insulation layer, tensile layer and sheath layer in this invention.

[0040] Figure 4 This is a cross-sectional view of the positioning component and locking part in the present invention.

[0041] Figure 5 This is a schematic diagram of the structure of the fixing frame and mounting hole in this invention;

[0042] Figure 6 This is a cross-sectional view of the locking part and the anti-tension rope in this invention.

[0043] Figure 7 This is a schematic diagram of the structure of the turbulence component in this invention.

[0044] In the diagram: 1. Conductor; 2. Shielding layer; 3. Cross-linked polyethylene insulation layer; 4. Sheath layer; 5. Tensile layer; 6. Raised strip; 7. Positioning frame; 8. Arc-shaped positioning pad; 9. Fixing frame; 10. Mounting hole; 11. Tensile rope; 12. Locking frame; 13. Bending frame; 14. Fastening frame; 15. Nut; 16. Screw; 17. Rotating sleeve; 18. Spiral air guide plate. Detailed Implementation

[0045] 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.

[0046] like Figures 1 to 7 As shown, this embodiment proposes a high-strength copper core cross-linked polyethylene insulated overhead power cable, including a conductor 1, a shielding layer 2, a cross-linked polyethylene insulation layer 3, and a sheath layer 4. The conductor 1 is formed by stranding several wires. The shielding layer 2 covers the outside of the conductor 1, the cross-linked polyethylene insulation layer 3 covers the outside of the shielding layer 2, and the sheath layer 4 covers the outside of the cross-linked polyethylene insulation layer 3. Several protruding strips 6 are provided on the outside of the sheath layer 4. The protruding strips 6 are arranged in a circumferential and equidistant manner on the outside of the sheath layer 4. All 6 are arranged parallel to the axis of conductor 1, and also include tensile layer 5, positioning components, tensile components and turbulence components. Tensile layer 5 is provided between cross-linked polyethylene insulation layer 3 and sheath layer 4. Several positioning components are provided at equal intervals on the outside of sheath layer 4 for fixing the cable to the transmission tower. The positioning components include positioning frames 7. Several positioning frames 7 are provided at equal intervals on the outside of sheath layer 4. The positioning frames 7 are set as split type. Each positioning frame 7 is provided with an arc-shaped positioning pad 8 inside. The arc-shaped positioning pad 8 abuts against sheath layer 4.

[0047] Specifically, after the overhead power cable is erected on the tower, it is necessary to fix the overhead cable to the tower. Since the positioning frame 7 is set as a split type, the lower half of the positioning frame 7 is first fixed to the tower by insulators. After the overhead cable is erected on the lower half of the positioning frame 7, the upper half of the positioning frame 7 is installed on the lower half of the positioning frame 7. The relative position of the positioning frame 7 and the overhead cable is fixed by setting the arc-shaped positioning pad 8. Then, the tensile component and the current-disrupting component are installed between two adjacent positioning components, and the tensile component is connected to the sheath layer 4. The sag of the overhead cable is determined according to the distance between two adjacent towers and the length of the overhead cable.

[0048] When encountering severe weather such as strong winds, the installation of the anti-current components can reduce the impact of the weather on the overhead cable, thereby reducing the occurrence of large-scale cable galloping. The installation of the tensile components and tensile layer 5, which is composed of several tensile wires twisted together, increases the tensile strength of the overhead cable. At the same time, the tensile components can share some of the tensile force with the overhead cable, thereby reducing the damage to the cable. In addition, the special design of the sheath layer 4, namely the installation of several protruding strips 6 integrally formed on the outside of the sheath layer 4, can suppress the amplitude of cable galloping to a certain extent, thereby reducing the impact of cable galloping on the connection position of the cable.

[0049] like Figures 1 to 6 As shown, a tensile component is provided between every two positioning components. The two ends of the tensile component are connected to the positioning components to tighten the cable. The tensile component includes a fixing frame 9, a tensile rope 11, and a locking part. A set of fixing frames 9 is provided between every two adjacent positioning frames 7. Several fixing frames 9 are arranged at equal intervals in each set. The inner side of each fixing frame 9 abuts against the sheath layer 4. Several mounting holes 10 are opened at equal angles in a circumferential shape on the outer side of each fixing frame 9. The fixing frame 9 is set as a split type. A set of tensile ropes 11 is provided on the outside of each set of fixing frames 9. Several tensile ropes 11 are arranged at equal angles in a circumferential shape in each set. Several mounting holes 10 on each fixing frame 9 correspond one-to-one with multiple tensile ropes 11. The tensile ropes 11 are in contact with the inner wall of the mounting holes 10. A locking part is installed at the end of each set of tensile ropes 11 to fix the tensile ropes 11.

[0050] Specifically, the number of fixing frames 9 is determined according to the length of the overhead cable between the two positioning frames 7. Then, the fixing frames 9 are fixedly installed on the overhead cable at certain intervals. Since the fixing frames 9 are set as separate units, they are easier to install. The installed fixing frames 9 are fixed in a relative position with the overhead cable. Then, the tension ropes 11 are sequentially passed through one of the mounting holes 10 on the fixing frame 9 at the end. Then, they are sequentially passed through the corresponding positions of the tension ropes 11 on all the fixing frames 9 until all the tension ropes 11 are connected. The ends of the tension ropes 11 are then fixed to the locking frames 12 on the positioning frames 7 by the setting of the locking part. During this process, the tension of different tension ropes 11 can be adjusted to achieve the best tensioning effect, which is convenient for protecting the overhead cable.

[0051] The above, such as Figure 4 , Figure 6 As shown, the locking part includes a locking frame 12, a bending frame 13, a fastening frame 14, and a locking component. Each anti-tension rope 11 has a locking frame 12 at both ends, and the locking frames 12 are fixedly connected to the corresponding positioning frames 7. Each anti-tension rope 11 has a bending area at one end inside the locking frame 12, such as... Figure 6 As shown at point A, each locking frame 12 has a bending frame 13 slidably installed inside it. The bending frame 13 is located inside the bending area of ​​the tensile rope 11 and abuts against the tensile rope 11. Each locking frame 12 has a fastening frame 14 slidably installed inside it and abuts against the tensile rope 11. Each locking frame 12 has a locking component installed on its top to fix the position of the fastening frame 14.

[0052] Specifically, when it is necessary to fix the end of the tension rope 11 to the corresponding locking frame 12, first pass the end of the tension rope 11 through the inner bottom wall of the corresponding locking frame 12 and the bending frame 13, then bend the tension rope 11 at the other end of the bending frame 13, pass the end of the tension rope 11 through the corresponding fastening frame 14 and the bending frame 13, then adjust the tension of the tension rope 11, and after the adjustment is completed, adjust the position of the locking component, thereby adjusting the position of the fastening frame 14 in the locking frame 12, thereby applying pressure to the tension rope 11, thereby fixing the relative position of the tension rope 11 and the locking frame 12.

[0053] The bending frame 13 has arc-shaped upper and lower sides, and the inner bottom wall of the locking frame 12 and the bottom of the fastening frame 14 are also arc-shaped, so as to more stably fix the relative position with the tensile rope 11.

[0054] The above, such as Figure 4 , Figure 6 As shown, the locking component includes a nut 15 and a screw 16. A nut 15 is fixedly installed on the top of each locking bracket 12, and a screw 16 is threaded inside each nut 15. Several screws 16 correspond one-to-one with several fastening brackets 14 and are rotatably connected.

[0055] Specifically, when it is necessary to adjust the position of the fastening bracket 14 within the locking bracket 12, the corresponding screw 16 is turned, thereby, through the cooperation of the nut 15, the corresponding fastening bracket 14 is pushed along the axis of the screw 16 to adjust its position, thereby fixing the position of the tensile rope 11 by the fastening bracket 14.

[0056] like Figure 1 , Figure 2 , Figure 7 As shown, a flow-dispersing component is installed on the tensile component to disperse the wind acting on the cable. The flow-dispersing component includes a rotating sleeve 17. Several sets of rotating sleeves 17 are arranged between every two adjacent fixed frames 9. Several sets of rotating sleeves 17 correspond one-to-one with several tensile ropes 11. Several sets of rotating sleeves 17 are respectively sleeved on the corresponding tensile ropes 11. Several rotating sleeves 17 are arranged at equal intervals in each set. Each rotating sleeve 17 is provided with a spiral air guide plate 18.

[0057] Specifically, when the overhead cable is in severe weather, the rotating sleeve 17 is set up so that when the wind passes through the overhead cable, the wind will act on the spiral wind guide plate 18 on the rotating sleeve 17. Through the setting of the spiral wind guide plate 18, under the influence of severe weather, the rotating sleeve 17 is driven to rotate on the tension rope 11, so that the wind passing through the overhead cable can be more dispersed, thereby reducing the impact of severe weather on the overhead cable.

[0058] It should be noted that the rotating sleeve 17 and the spiral air guide plate 18 are preferably made of engineering plastic with good weather resistance, and there is a certain gap between the rotating sleeve 17 and the tensile rope 11 to avoid jamming, which helps to reduce the overall weight and avoid affecting the sag of the overhead cable.

[0059] The working principle or usage process of this application is as follows:

[0060] After the overhead power cable is erected on the tower, it is necessary to fix the overhead cable to the tower. Since the positioning frame 7 is set as a split type, the lower half of the positioning frame 7 is first fixed to the tower with insulators. After the overhead cable is erected on the lower half of the positioning frame 7, the upper half of the positioning frame 7 is installed on the lower half of the positioning frame 7. The relative position of the positioning frame 7 and the overhead cable is fixed by setting the arc-shaped positioning pad 8. At the same time, the sag of the overhead cable is determined according to the distance between two adjacent towers and the length of the overhead cable.

[0061] Then, determine the number of fixing frames 9 based on the length of the overhead cable between the two positioning frames 7, and then fix the fixing frames 9 on the overhead cable at certain intervals. Since the fixing frames 9 are set as separate units, they are easier to install. The installed fixing frames 9 are fixed in relative position to the overhead cable. Then, the tensile ropes 11 are passed through one of the mounting holes 10 on the fixing frame 9 at the end in sequence, and then passed through the corresponding positions of the tensile ropes 11 on all the fixing frames 9 in sequence until all the tensile ropes 11 are connected. Then, the ends of the tensile ropes 11 can be fixed to the locking frames 12 on the positioning frame 7.

[0062] When it is necessary to fix the end of the tension rope 11 to the corresponding locking frame 12, first pass the end of the tension rope 11 through the inner bottom wall of the corresponding locking frame 12 and between the bending frame 13. Then bend the tension rope 11 at the other end of the bending frame 13 and pass the end of the tension rope 11 through the corresponding fastening frame 14 and between the bending frame 13. Then adjust the tension of the tension rope 11. After the adjustment is completed, the corresponding screw 16 can be turned. Through the cooperation of the nut 15, the screw 16 pushes the corresponding fastening frame 14 to adjust along the axis of the screw 16, thereby adjusting the position of the fastening frame 14 in the locking frame 12, thereby applying pressure to the tension rope 11, and thus fixing the relative position of the tension rope 11 and the locking frame 12.

[0063] When encountering severe weather such as strong winds, the rotating sleeve 17, when the wind passes over the overhead cable, acts on the spiral wind guide plate 18 on the rotating sleeve 17. The spiral wind guide plate 18, under the influence of severe weather, drives the rotating sleeve 17 to rotate on the tension rope 11, thereby dispersing the wind passing over the overhead cable and reducing the impact of severe weather on the overhead cable, thus reducing the likelihood of the overhead cable swinging significantly. The tension rope 11 and tension layer 5, composed of several twisted tension wires, increase the tensile strength of the overhead cable. Simultaneously, the tension rope 11 can share some of the tension with the overhead cable, thereby reducing damage to the cable. Furthermore, the special design of the sheath layer 4, namely the several integrally formed protrusions 6 on the outside of the sheath layer 4, can suppress the amplitude of cable swing to a certain extent, thereby reducing the impact of cable swinging on the cable connection position.

[0064] 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 high-strength copper core cross-linked polyethylene insulated overhead power cable, comprising a conductor (1), a shielding layer (2), a cross-linked polyethylene insulation layer (3), and a sheath layer (4), wherein the conductor (1) is formed by stranding several wires, the shielding layer (2) covers the outside of the conductor (1), the cross-linked polyethylene insulation layer (3) covers the outside of the shielding layer (2), and the sheath layer (4) covers the outside of the cross-linked polyethylene insulation layer (3), characterized in that, Also includes: Tensile layer (5), the tensile layer (5) is provided between the cross-linked polyethylene insulation layer (3) and the sheath layer (4); Positioning components, a plurality of positioning components are provided at equal intervals on the outside of the sheath layer (4) for fixing the cable on the transmission tower; A tensile component is provided between every two positioning components, and both ends of the tensile component are respectively connected to the positioning component for tightening the cable; A turbulence-dispersing component is installed on the tensile component to disperse wind acting on the cable; The positioning component includes: Positioning frame (7), a plurality of positioning frames (7) are provided at equal intervals on the outside of the sheath layer (4); The positioning frame (7) is configured as a split type, and each positioning frame (7) is provided with an arc-shaped positioning pad (8) inside, and the arc-shaped positioning pad (8) abuts against the sheath layer (4); The tensile component includes: The fixing frame (9) is provided between every two adjacent positioning frames (7). Each set of fixing frames (9) is provided with several fixing frames at equal distances. The inner side of each fixing frame (9) abuts against the sheath layer (4). The outer side of each fixing frame (9) is provided with several mounting holes (10) at equal angles in a circular shape. The fixing frame (9) is configured as a split type; Tension rope (11), each set of the fixing frame (9) is provided with a set of tension rope (11) on the outside, each set of tension rope (11) is provided with a number of them in a circumferential shape at equal angles, and a number of mounting holes (10) on each fixing frame (9) correspond one-to-one with a number of tension ropes (11), and the tension rope (11) contacts the inner wall of the mounting hole (10); Locking part: Each end of the tensile rope (11) is equipped with the locking part for fixing the tensile rope (11). The locking part includes: Locking frame (12), each of the two ends of the tensile rope (11) is provided with the locking frame (12), and the locking frame (12) is fixedly connected to the corresponding positioning frame (7); Each of the tensile ropes (11) has a bending area at one end inside the locking frame (12); A bending frame (13) is slidably installed inside each of the locking frames (12). The bending frame (13) is located inside the bending area of ​​the tensile rope (11), and the bending frame (13) abuts against the tensile rope (11). Fastening bracket (14), each of the locking brackets (12) has the fastening bracket (14) slidably installed inside, the fastening bracket (14) abutting against the tensile rope (11); A locking member is installed on the top of each of the locking frames (12) for fixing the position of the fastening frame (14).

2. The high-strength copper core cross-linked polyethylene insulated overhead power cable according to claim 1, characterized in that, The outer side of the sheath layer (4) is provided with several protruding strips (6). The protruding strips (6) are arranged in a circular shape at equal angles on the outer side of the sheath layer (4). The protruding strips (6) are all arranged parallel to the axis of the conductor (1).

3. A high-strength copper core cross-linked polyethylene insulated overhead power cable according to claim 2, characterized in that, The locking component includes a nut (15) and a screw (16). The nut (15) is fixedly installed on the top of each locking frame (12). The screw (16) is threaded inside each nut (15). Several screws (16) correspond one-to-one with several fastening frames (14) and are rotatably connected.

4. A high-strength copper core cross-linked polyethylene insulated overhead power cable according to claim 3, characterized in that, The turbulence-disrupting component includes: Rotating sleeve (17), several sets of rotating sleeves (17) are provided between each two adjacent fixed frames (9), and several sets of rotating sleeves (17) correspond one-to-one with several tensile ropes (11), and several sets of rotating sleeves (17) are respectively sleeved on the corresponding tensile ropes (11); Each set of rotating sleeves (17) has several units arranged at equal intervals.

5. A high-strength copper-core cross-linked polyethylene insulated overhead power cable according to claim 4, characterized in that, Each of the rotating sleeves (17) is provided with a spiral air guide plate (18).

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