Overhead transmission cable

Abstract

The utility model relates to the technical field of overhead cables, and provides an overhead transmission cable which comprises a force bearing assembly, a power transmission assembly, a plurality of buffer pieces, an inner protection layer and an outer protection layer, the power transmission assembly is coaxially arranged on the outer side of the force bearing assembly, and the inner protection layer and the outer protection layer are sequentially and coaxially arranged on the outer side of the power transmission assembly from inside to outside. The plurality of buffers are circumferentially distributed in a gap between the inner sheath and the power transmission assembly. According to the overhead transmission cable, the anti-vibration capability and the heat dissipation capability of the overhead transmission cable can be improved, and the overhead transmission cable is suitable for new energy power transmission scenes with rich wind power resources.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of overhead cables, in particular to an overhead transmission cable. BACKGROUND

[0002] As a kind of efficient power transmission medium, overhead insulated cable is widely used in urban power grid, its main function is to transmit electric energy to user end, at the same time, through the insulation layer, the cable is protected from the influence of external environment, to ensure the safety and reliability of power transmission. In recent years, the development and utilization of new energy has become an important direction of global energy transformation, especially wind energy as a clean and renewable energy source, has great development potential. Wind power is usually located in areas rich in wind resources, such as coastal, plateau or mountainous areas, after the wind energy in these areas is converted into electric energy, it needs to be transmitted to the load center through efficient transmission line. However, the existing overhead insulated cable mainly aims at the design and function of urban power transmission, and has many shortcomings, which is difficult to meet the special needs of new energy power generation, especially wind power generation.

[0003] Firstly, the existing overhead insulated cable is mainly optimized for urban power transmission scene in mechanical structure, and lacks adaptability to complex environment. For example, wind power plants are usually located in areas rich in wind resources, where the wind speed is high and the wind direction is changeable, and the cable will be subjected to a large wind load during operation. The existing cable lacks vibration resistance, and is prone to structural damage or unstable operation due to wind load. Secondly, the existing overhead insulated cable mostly does not consider cooling measures, which cannot effectively cope with the heat dissipation demand in high load and high temperature environment of new energy power generation scene. For example, in wind power generation, due to the large fluctuation of output power of wind turbine, a large amount of heat will be generated in the transmission process of cable, and the existing cable lacks effective cooling mechanism, which may cause the aging of insulation material to accelerate, reducing the service life and transmission efficiency of the cable.

[0004] Chinese patent with publication number CN201570300U discloses an overhead insulated cable, in which the cross section of the overhead insulated cable is triangular as a whole, and the overhead insulated cable is installed by setting steel wire rope and bearing steel strand. In actual application, the technical scheme of the patent has the following shortcomings: 1. The setting of steel wire rope and bearing steel strand greatly increases the self weight of the overhead insulated cable as a whole, thereby increasing the bearing burden of the tower and iron accessories in the erection line; 2. Due to the large self weight, it cannot be applied to the design line with large span and small sag; 3. The triangular cross section setting makes the side of the cable easily bear a large wind load, which is not conducive to application in areas rich in wind resources.

[0005] Therefore, how to provide an overhead transmission cable suitable for wind power transmission line and improve the vibration resistance and heat dissipation capacity of the cable has become a technical problem to be solved. Utility Model Content

[0006] In view of this, in order to overcome the shortcomings of the prior art, this application aims to provide an overhead transmission cable.

[0007] This application provides an overhead transmission cable, which includes a load-bearing component, a power transmission component, multiple buffers, an inner sheath, and an outer sheath. The power transmission component is coaxially disposed on the outside of the load-bearing component, and the inner and outer sheaths are coaxially disposed on the outside of the power transmission component from the inside to the outside. The multiple buffers are circumferentially distributed in the gap between the inner sheath and the power transmission component.

[0008] Optionally, in the overhead transmission cable of this application, the load-bearing component includes multiple spirally twisted load-bearing units and a load-bearing component sheath disposed outside the multiple spirally twisted load-bearing units.

[0009] Optionally, in the overhead transmission cable of this application, the load-bearing unit consists of a load-bearing component and a load-bearing component insulation layer covering the outside of the load-bearing component.

[0010] Optionally, in the overhead transmission cable of this application, the power transmission component includes an inner conductor and an outer conductor, a first insulation layer, and a second insulation layer arranged sequentially from the inside to the outside of the inner conductor.

[0011] Optionally, in the overhead transmission cable of this application, the overall annular internal conductor is made of multiple metal conductors with circular cross-sections twisted together.

[0012] Optionally, in the overhead transmission cable of this application, the outer conductor, which is circular in shape, is made of multiple metal conductors with non-circular cross-sections twisted together.

[0013] Optionally, in the overhead transmission cable of this application, the outer conductor is made of multiple irregularly shaped metal conductors with Z-shaped cross-sections twisted together.

[0014] Optionally, in the overhead transmission cable of this application, the outer conductor is made of multiple irregularly shaped metal conductors with trapezoidal cross-sections twisted together.

[0015] Optionally, in the overhead transmission cable of this application, the buffer is a hollow tube, and multiple buffers are spirally wound around the outside of the power transmission component.

[0016] Optionally, in the overhead transmission cable of this application, the buffer is also used to transmit cooling fluid.

[0017] The overhead transmission cable of this application, through comprehensive structural design, can improve the vibration resistance and heat dissipation capacity of the overhead transmission cable, and is suitable for new energy power transmission scenarios with abundant wind resources. Attached Figure Description

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 For the structure example diagram of an overhead transmission cable according to an embodiment of the present application;

[0020] Figure 2 For the structure example diagram of a force bearing assembly according to an embodiment of the present application;

[0021] Figure 3 For the structure example diagram of a power transmission assembly according to an embodiment of the present application;

[0022] In the figure, 1 is a force bearing assembly, 2 is a power transmission assembly, 3 is a buffer, 4 is an inner protective layer, 5 is an outer protective layer, 11 is a force bearing unit, 12 is a force bearing assembly protective layer, 111 is a force bearing member, 112 is a force bearing member insulation layer, 21 is an inner conductor, 22 is an outer conductor, 23 is a first insulation layer, and 24 is a second insulation layer. DETAILED DESCRIPTION

[0023] The embodiments of the present application will be described in detail below with reference to the drawings.

[0024] It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict; and based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present disclosure.

[0025] It should be noted that the various aspects of the embodiments described below are within the scope of the appended claims. It should be apparent that the aspects described herein can be embodied in a wide variety of forms and that any specific structure and / or function described herein is merely illustrative. Based on the teachings provided herein one skilled in the art should be able to contemplate these and similar implementations without departing from the scope of the disclosure. For example, an apparatus and / or method could be implemented using any number of the aspects set forth herein. In addition, an apparatus and / or method could be implemented using other structure and / or functionality consistent with the teachings herein.

[0026] Figure 1 For the structure example diagram of an overhead transmission cable according to an embodiment of the present application, as Figure 1As shown, the overhead transmission cable of this embodiment includes a load-bearing component 1, a power transmission component 2, multiple buffers 3, an inner sheath 4, and an outer sheath 5. The power transmission component 2 is coaxially disposed on the outside of the load-bearing component 1. The inner sheath 4 and the outer sheath 5 are coaxially disposed on the outside of the power transmission component 2 from the inside to the outside. The multiple buffers 3 are circumferentially distributed in the gap between the inner sheath 4 and the power transmission component 2.

[0027] Figure 2 This is a structural example diagram of a load-bearing component according to an embodiment of this application, such as... Figure 1 and Figure 2 As shown, in this embodiment, the load-bearing component 1 includes multiple spirally wound load-bearing units 11 and a load-bearing component protective layer 12 disposed outside the multiple spirally wound load-bearing units 11. Each load-bearing unit 11 consists of a load-bearing element 111 and a load-bearing element insulation layer 112 covering the outside of the load-bearing element 111. In practical applications, the load-bearing element 111 is made of a high-strength metal material, such as Invar steel core or high-strength high-core steel, and the load-bearing component insulation layer 112 covering the outside of the load-bearing element 111 is made of cross-linked polyvinyl chloride material. It should be noted that in this embodiment, the load-bearing element 111 can be specifically selected according to actual installation environment parameters such as span and sag, and the load-bearing component insulation layer 112 can be specifically selected according to current carrying capacity design parameters. For example, it can also be made of cross-linked polyolefin material or silicone rubber material; this embodiment does not impose any limitations on this. Correspondingly, in this embodiment, the load-bearing component protective layer 12 is made of the same material as the load-bearing component insulation layer 112.

[0028] Figure 3 This is a structural example diagram of a power transmission component according to an embodiment of this application, such as... Figures 1 to 3 As shown, in this embodiment, the power transmission component 2 includes an inner conductor 21 and an outer conductor 22, a first insulating layer 23, and a second insulating layer 24, which are sequentially disposed outside the inner conductor 21 from the inside out. As an optional example, in this embodiment, the inner conductor 21 and the outer conductor 22 are generally annular. The inner conductor 21 is made of multiple circular cross-section metal conductors twisted together, and the outer conductor 22 is made of multiple Z-shaped cross-section metal conductors twisted together. In practical applications, the outer conductor 22 can also be made of metal conductors with other cross-sectional shapes, such as trapezoidal cross-section metal conductors; this embodiment does not limit this. In this embodiment, the outer conductor 22 and the inner conductor 21 are made of metal materials with excellent physical, mechanical, and electrical properties. Specifically, current-carrying design and line parameters can be considered, for example, electrical aluminum or aluminum alloy materials with a conductivity higher than 62% IACS can be selected. The first insulating layer 23 and the second insulating layer 24 can be specifically selected according to the current-carrying design. For example, the first insulating layer 23 is made of semi-conductive cross-linked polyethylene material, and the second insulating layer 24 is made of cross-linked polyethylene or cross-linked polyolefin material.

[0029] As an optional example, in the embodiment, the buffer 3 is a hollow tube, and a plurality of buffers 3 are spirally wound outside the power transmission assembly 2. In the embodiment, the plurality of buffers 3 spirally distributed between the power transmission assembly 2 and the inner protective layer 4 can improve the anti-vibration capability of the overall structure of the overhead transmission cable. When the overhead transmission cable of the embodiment is erected in a new energy transmission line with rich wind resources, the plurality of buffers 3 can deform when subjected to wind load, thereby effectively reducing the influence of wind load on the internal components and maintaining the stability of the overall overhead transmission cable.

[0030] It should be noted that in the embodiment, the buffer 3 is also used to transmit cooling fluid. In the embodiment, the transmission of cooling fluid, such as cooling liquid medium or cooling gas medium, through the buffer 3 can reduce the temperature of the internal components during operation, thereby further ensuring the safety and reliability of the overall cable. The overhead transmission cable of the embodiment can improve the anti-vibration capability and heat dissipation capability of the overhead transmission cable through comprehensive structural design, and is suitable for new energy power transmission scenarios with rich wind resources.

[0031] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in the present application can be easily thought of by those skilled in the art, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An overhead transmission cable, characterized by The overhead transmission cable comprises a force bearing assembly, a power transmission assembly, a plurality of buffer members, an inner protective layer and an outer protective layer, the power transmission assembly is coaxially arranged outside the force bearing assembly, the inner protective layer and the outer protective layer are coaxially arranged outside the power transmission assembly from inside to outside, and the plurality of buffer members are circumferentially distributed in the gap between the inner protective layer and the power transmission assembly.

2. The overhead transmission cable of claim 1, wherein, The force bearing assembly comprises a plurality of helically twisted force bearing units and a force bearing assembly protective layer arranged outside the plurality of helically twisted force bearing units.

3. The overhead transmission cable of claim 2, wherein, The force bearing unit is composed of a force bearing member and a force bearing member insulation layer wrapped outside the force bearing member.

4. The overhead transmission cable of claim 1, wherein, The power transmission assembly comprises an inner conductor and an outer conductor, a first insulation layer and a second insulation layer arranged outside the inner conductor from inside to outside.

5. The overhead transmission cable of claim 4, wherein, The overall circular ring-shaped inner conductor is made of a plurality of circular cross-section metal conductors.

6. The overhead transmission cable of claim 4, wherein, The overall circular ring-shaped outer conductor is made of a plurality of non-circular cross-section metal conductors.

7. The overhead transmission cable of claim 6, wherein, The outer conductor is made of a plurality of Z-shaped cross-section metal conductors.

8. The overhead transmission cable of claim 6, wherein, The outer conductor is made of a plurality of trapezoidal cross-section metal conductors.

9. The overhead power transmission cable of claim 1, wherein, The buffer member is a hollow pipe body, and the plurality of buffer members are helically wound outside the power transmission assembly.

10. The overhead transmission cable of claim 9, wherein, The buffer member is also used for transmitting cooling fluid.

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