High efficient transmission cross-linked polyethylene insulated cable adapted to new energy facilities

Abstract

The application relates to the technical field of cross-linked polyethylene insulated cables, and discloses a high-efficiency transmission cross-linked polyethylene insulated cable suitable for new energy facilities, which comprises, from inside to outside, a conductor cable core, a cable core insulation layer, an inner insulation layer, a shielding layer and an outer protective layer, and further comprises a hollow spiral heat dissipation core, a gas supply head group, an annular gas conveying cylinder, a plurality of hollow detection pipes and a plurality of hollow gas conveying butt joints; the outer surface of the hollow spiral heat dissipation core is provided with a spiral heat dissipation channel, the conductor cable core is wound in the spiral heat dissipation channel, the gas supply head group is detachably connected to one end of the hollow spiral heat dissipation core and is in sealed communication with the internal cavity of the hollow spiral heat dissipation core. Through the technical scheme, the cross-linked polyethylene insulated cable suitable for new energy facilities in the prior art has the problems of accelerated insulation aging and reduced transmission efficiency caused by overheating when facing the development trend of higher voltage and greater power.

Description

Technical Field

[0001] This invention relates to the field of cross-linked polyethylene insulated cable technology, and more specifically, to a high-efficiency cross-linked polyethylene insulated cable adapted to new energy facilities. Background Technology

[0002] With the transformation and upgrading of the global energy structure, new energy power generation systems represented by photovoltaics and wind power are developing rapidly towards large scale, high voltage, and large capacity. This puts forward higher requirements for power cables connecting power generation units, converter equipment and power grid. Cables adapted to new energy facilities not only need to have excellent electrical insulation performance and resistance to environmental aging, but also need to meet the requirements of efficient transmission and long-term operational reliability.

[0003] Currently, high-efficiency transmission cables suitable for new energy facilities typically use cross-linked polyethylene (XLPE) as insulation material. Due to its excellent electrical strength, heat resistance, and mechanical properties, XLPE has become the preferred choice for medium and high voltage cable insulation. The structure of such cables usually includes, from the inside out: a cable core as a conductor, a XLPE insulation layer wrapped around the conductor, a semi-conductive shielding layer, and an outermost polyvinyl chloride (PVC) or polyethylene (PE) sheath. Its core function is to achieve efficient and low-loss transmission of electrical energy, and to provide mechanical protection and weather resistance through the outer sheath.

[0004] However, with the continuous improvement of voltage levels in new energy power generation systems, the power density of cable transmission is increasing, and the Joule heat generated by conductor resistance during operation is also increasing significantly. Excessive operating temperature will accelerate the thermal aging of cross-linked polyethylene insulation materials, leading to a decline in insulation performance, shortening the cable's service life, and even causing serious faults such as insulation breakdown. The heat dissipation of cables in the current technology mainly relies on radial heat conduction from the cable core to the outer sheath, which ultimately dissipates the heat to the surrounding environment. However, this passive heat dissipation method is inefficient, and heat is easily accumulated inside the cable. The temperature rise problem is particularly prominent when multiple cables are laid closely together or when the heat dissipation conditions in the laying environment are poor. Although there are ways to optimize the thermal conductivity of the sheath material or add heat sinks to the outside of the cable, the fundamental heat dissipation bottleneck (i.e., the difficulty in quickly dissipating internal heat) has not been effectively solved.

[0005] Moreover, existing new energy power plants (such as large photovoltaic power plants or wind farms) usually occupy a large area and have dispersed equipment layouts, requiring a large number of control, monitoring and communication cables. In actual installation, these auxiliary cables often need to be laid together with the main power cables. Currently, they are generally laid separately or simply bundled. This not only increases the complexity and cost of construction, but also makes cable management chaotic and inconvenient for later maintenance and repair. Furthermore, too many cables wrapped around the main cable will further increase the heat dissipation efficiency of the main cable. Summary of the Invention

[0006] This invention proposes a high-efficiency cross-linked polyethylene insulated cable for transmission adapted to new energy facilities, in order to solve the problem mentioned in the background art, that existing cross-linked polyethylene insulated cables adapted to new energy facilities suffer from accelerated insulation aging and decreased transmission efficiency due to overheating when facing the development trend of higher voltage and greater power.

[0007] The technical solution of the present invention is as follows: a high-efficiency cross-linked polyethylene insulated cable for transmission adapted to new energy facilities, comprising a conductor core, a core insulation layer, an inner insulation layer, a shielding layer and an outer protective layer arranged sequentially from the inside to the outside, and further comprising a hollow spiral heat dissipation core, an air supply head assembly, an annular air supply cylinder, several hollow detection tubes and several hollow air supply docking parts; The outer surface of the hollow spiral heat dissipation core is provided with a spiral heat dissipation channel, and the conductor cable core is wound and disposed in the spiral heat dissipation channel; The air supply head assembly is detachably connected to one end of the hollow spiral heat dissipation core and is sealed and connected to the internal cavity of the hollow spiral heat dissipation core for introducing cooling gas into the hollow spiral heat dissipation core. The annular gas delivery cylinder is sleeved outside the gas supply head assembly; Several hollow detection tubes are circumferentially spaced and embedded within the outer protective layer; Several hollow gas delivery docking sections are connected between the annular gas delivery cylinder and each hollow detection tube, for delivering gas from the annular gas delivery cylinder to the hollow detection tube.

[0008] As a preferred technical solution of the present invention, a plurality of outer cable arrangement components are provided at intervals along the cable axis between the shielding layer and the outer protective layer. The external cable arrangement assembly includes a ring-shaped body and several arrangement rods; The annular body is sleeved outside the shielding layer and embedded in the inner wall of the outer protective layer; Several of the arrangement rods are circumferentially spaced on the annular body, and one end of each arrangement rod extends to the outside of the outer protective layer, and a cable positioning head is rotatably provided at the end of the arrangement rod.

[0009] Based on the aforementioned scheme, the gas supply head assembly includes a spiral connector, a gas delivery pipe, and a gas delivery cap; One end of the spiral connector is provided with a spiral groove, the end of the hollow spiral heat dissipation core is sealable and the thread is detachably disposed in the spiral groove, and the interior of the spiral connector is provided with an air supply hole that communicates with the internal cavity of the hollow spiral heat dissipation core. The gas supply pipe is located on the side of the spiral connector away from the hollow spiral heat dissipation core and is connected to the gas supply hole; The gas supply cap is detachably mounted on the side of the gas supply pipe away from the spiral connector, and a cooling air inlet pipe that is connected to the gas supply pipe is provided through the gas supply cap.

[0010] Based on the aforementioned scheme, a pressurization pipe is connected to the annular gas cylinder, and a pressurization check valve is installed on the pressurization pipe; The annular gas delivery cylinder is also equipped with a gas pressure detection sensor to detect the gas pressure inside the annular gas delivery cylinder.

[0011] Furthermore, based on the aforementioned scheme, the hollow gas delivery docking part includes a convex positioning tube and a telescopic tube; The convex positioning tube is connected to the annular gas delivery cylinder; One end of the telescopic tube is connected to the convex positioning tube, and the other end is connected to a convex connector. One end of the convex connector can extend into one side of the end of the hollow detection tube and be sealed and connected to the hollow detection tube.

[0012] Furthermore, based on the aforementioned scheme, the annular gas cylinder is provided with several cable core positioning holes for the conductor cable core to pass through.

[0013] Furthermore, based on the aforementioned scheme, several of the conductor cable cores are interlaced and wound around the hollow spiral heat dissipation core, so that the hollow spiral heat dissipation core extends in a spiral shape, thereby increasing the contact area with the cooling gas.

[0014] The beneficial effects of this invention are as follows: 1. In this invention, by setting a hollow spiral heat dissipation core and introducing cooling gas into the core, an active heat dissipation channel can be formed inside the cable, which can directly dissipate the Joule heat generated by the conductor during operation. This effectively overcomes the limitations of traditional cables that rely on radial passive heat dissipation. This active heat dissipation mechanism can significantly improve heat dissipation efficiency, significantly reduce the internal temperature of the cable, thereby delaying the thermal aging process of cross-linked polyethylene insulation material, extending the service life of the cable, and ensuring its operational reliability under higher voltage and higher power density. 2. In this invention, by setting an external cable arrangement component inside the outer protective layer, auxiliary cables such as control, monitoring, and communication cables can be orderly and fixedly arranged outside the main cable, realizing the integrated laying of power cables and auxiliary cables. This design not only simplifies the construction process and reduces laying costs, but also avoids the adverse effects on heat dissipation of the main cable caused by disorderly bundling of auxiliary cables. Furthermore, it facilitates later maintenance and repair, improving the standardization and neatness of cable management in new energy power stations.

[0015] 3. In this invention, hollow detection tubes filled with constant pressure are embedded circumferentially within the outer protective layer. These detection tubes, together with the annular air supply cylinder and the air pressure detection sensor, constitute a closed pressure monitoring system. When the outer protective layer of the cable is damaged by external compression, impact, or other unexpected events, causing the hollow detection tubes to rupture, the internal pressure of the system will change instantaneously. The air pressure detection sensor can immediately capture this signal and send an alarm to the monitoring center. This design realizes real-time, online, and accurate location monitoring of cable mechanical damage, transforming traditional passive and post-event maintenance into proactive and early warning maintenance, greatly improving operation and maintenance efficiency and system safety. 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 For the present invention Figure 1 A magnified schematic diagram of the partial structure at point A in the middle; Figure 3 This is a schematic diagram of the structure of the conductor cable core, the cable core insulation layer, and the hollow spiral heat dissipation core in this invention; Figure 4 This is a schematic diagram of the structure of the conductor cable core, cable core insulation layer, inner insulation layer, shielding layer, hollow spiral heat dissipation core and outer cable arrangement assembly in this invention; Figure 5 This is a schematic diagram of the structure of the outer protective layer and the hollow detection tube in this invention; Figure 6 This is a schematic diagram of the structure of the gas supply head assembly, the annular gas cylinder, the pressurization pipe, and the pressurization check valve in this invention. Figure 7 This is a schematic diagram of the hollow gas delivery docking section in this invention.

[0018] In the diagram: 001, gas supply head assembly; 002, hollow gas transmission docking section; 1. Conductor core; 2. Core insulation layer; 3. Inner insulation layer; 4. Shielding layer; 5. Outer protective layer; 6. Hollow spiral heat dissipation core; 7. Annular air supply cylinder; 8. Hollow detection tube; 9. Annular body; 10. Arrangement rod; 11. Cable positioning head; 12. Spiral connector; 13. Spiral groove; 14. Air supply hole; 15. Air supply pipe; 16. Air supply cap; 17. Cooling air inlet pipe; 18. Pressurization pipe; 19. Pressurization check valve; 20. Air pressure detection sensor; 21. Convex positioning tube; 22. Telescopic tube; 23. Convex connector; 24. Core positioning hole. 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] Examples, such as Figures 1 to 7 As shown in the figure, this embodiment proposes a high-efficiency cross-linked polyethylene insulated cable for transmission that is adapted to new energy facilities. Its main structure consists of a conductor core 1, a core insulation layer 2, an inner insulation layer 3, a shielding layer 4, and an outer protective layer 5 arranged sequentially from the inside to the outside. These layers together constitute the basic electrical insulation and physical protection system of the cable.

[0021] The core improvement of this invention lies in the integration of an active heat dissipation system and a real-time damage monitoring system.

[0022] The core of the active cooling system is a hollow spiral heat dissipation core 6. The heat dissipation core has a hollow cavity structure inside and a continuous spiral heat dissipation channel processed on its outer surface. Multiple conductor cable cores 1 (usually three, corresponding to three-phase AC power) are wound and embedded in the spiral heat dissipation channel in an interlaced manner, so that the conductor cable cores 1 and the hollow spiral heat dissipation core 6 have the largest contact area.

[0023] At one end of the hollow spiral heat sink 6, a gas supply head assembly 001 is sealed and connected. The gas supply head assembly 001 includes a spiral connector 12, a gas supply pipe 15, and a gas supply cap 16. One end of the spiral connector 12 is provided with a spiral groove 13. The end of the hollow spiral heat sink 6 is sealed and detachably threaded in the spiral groove 13. The spiral connector 12 is provided with a gas supply hole 14 that communicates with the internal cavity of the hollow spiral heat sink 6. The gas supply pipe 15 is located on the side of the spiral connector 12 away from the hollow spiral heat sink 6 and is connected to the gas supply hole 14. The gas supply cap 16 is detachably located on the side of the gas supply pipe 15 away from the spiral connector 12. A cooling air inlet pipe 17 that communicates with the gas supply pipe 15 is provided through the gas supply cap 16.

[0024] Specifically, during operation, cooling gas is introduced through the cooling inlet pipe 17, flows through the gas delivery pipe 15 and the spiral connector 12 in sequence, and finally enters the internal cavity of the hollow spiral heat dissipation core 6. When the cooling gas flows through the spiral cavity, it will fully absorb the Joule heat generated by the conductor cable core 1 wrapped around it, and carry the heat out from the other end of the cable (or through a preset circuit) through the flow of gas, thereby achieving efficient axial active heat dissipation.

[0025] The real-time damage monitoring system mainly consists of an annular gas cylinder 7, a hollow detection tube 8, and a hollow gas delivery docking part 002. The annular gas cylinder 7 is sleeved outside the gas supply head group 001, and has a cable core positioning hole 24 for the conductor cable core 1 to pass through, ensuring a compact cable structure. A pressurization tube 18 is connected to the annular gas cylinder 7, and a pressurization check valve 19 is installed on the pressurization tube 18 to fill the system with gas (such as dry air or nitrogen) at a certain pressure. A gas pressure detection sensor 20 is also installed on the annular gas cylinder 7 to detect the gas pressure inside the annular gas cylinder 7.

[0026] The aforementioned hollow detection tubes 8 are all circumferentially spaced within the outer protective layer 5. These detection tubes are extruded together with the cable during the manufacturing process and become part of the outer protective layer 5.

[0027] The aforementioned hollow gas delivery docking parts 002 are all connected between the annular gas delivery cylinder 7 and each hollow detection tube 8, and are used to deliver gas from the annular gas delivery cylinder 7 to the hollow detection tube 8. The hollow gas delivery docking part 002 includes a convex positioning tube 21 and a telescopic tube 22. The convex positioning tube 21 is connected to the annular gas delivery cylinder 7. One end of the telescopic tube 22 is connected to the convex positioning tube 21, and the other end is connected to a convex connector 23. One end of the convex connector 23 can extend into one end of the hollow detection tube 8 and is sealed and connected to the hollow detection tube 8.

[0028] The annular gas cylinder 7, the hollow gas delivery docking part 002, and all the hollow detection tubes 8 together form a closed, airtight network filled with constant pressure.

[0029] Specifically, during normal cable operation, the pressure value monitored by the air pressure detection sensor 20 remains stable within a preset range. Once the outer protective layer 5 of the cable ruptures due to external construction, squeezing, impact, or other unexpected events, the airtightness of the closed system will be compromised, and the internal pressure will drop rapidly (or fluctuate abnormally). The air pressure detection sensor 20 will immediately detect this pressure change and transmit the signal to the background monitoring system, triggering an alarm. Maintenance personnel can locate the damaged cable section based on the signal, thereby responding quickly and performing precise repairs to avoid potential insulation damage or short circuit faults.

[0030] To solve the problem of auxiliary cable laying, an external cable laying assembly is installed at regular intervals along the cable axis between the shielding layer 4 and the outer protective layer 5.

[0031] The outer cable arrangement assembly includes an annular body 9 and several arrangement rods 10. The annular body 9 is sleeved on the outside of the shielding layer 4 and embedded in the inner wall of the outer protective layer 5. The several arrangement rods 10 are arranged circumferentially on the annular body 9, and one end of each arrangement rod 10 extends to the outside of the outer protective layer 5. A cable positioning head 11 is rotatably provided at the end of the arrangement rod 10.

[0032] Specifically, during installation, auxiliary cables can be neatly fixed in these cable positioning heads 11, thereby achieving integrated and standardized installation with the main cable, which is both aesthetically pleasing and easy to manage, and avoids the auxiliary cables from being tightly wrapped around the main cable, thus affecting its heat dissipation.

[0033] 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-efficiency cross-linked polyethylene insulated cable for transmission adapted to new energy facilities, comprising, from the inside out, a conductor core (1), a core insulation layer (2), an inner insulation layer (3), a shielding layer (4), and an outer protective layer (5), characterized in that, Also includes: Hollow spiral heat dissipation core (6), the outer surface of the hollow spiral heat dissipation core (6) is provided with a spiral heat dissipation channel, and the conductor cable core (1) is wound and arranged in the spiral heat dissipation channel; The air supply head assembly (001) is detachably connected to one end of the hollow spiral heat dissipation core (6) and is sealed and connected to the internal cavity of the hollow spiral heat dissipation core (6) for introducing cooling gas into the hollow spiral heat dissipation core (6); An annular gas cylinder (7) is fitted outside the gas supply head assembly (001); Several hollow detection tubes (8) are embedded in the outer protective layer (5) at intervals along the circumference; Several hollow gas delivery docking parts (002) are connected between the annular gas delivery cylinder (7) and each of the hollow detection tubes (8) for delivering gas from the annular gas delivery cylinder (7) to the hollow detection tubes (8).

2. The high-efficiency cross-linked polyethylene insulated cable for transmission adapted to new energy facilities according to claim 1, characterized in that, Between the shielding layer (4) and the outer protective layer (5), a plurality of outer cable arrangement assemblies are provided at intervals along the cable axis; The external cable routing assembly includes: The annular body (9) is sleeved on the outside of the shielding layer (4) and embedded in the inner wall of the outer protective layer (5); Several arrangement rods (10) are arranged circumferentially on the annular body (9), and one end of each arrangement rod (10) extends to the outside of the outer protective layer (5), and a cable positioning head (11) is rotatably provided at the end of the arrangement rod (10).

3. The high-efficiency cross-linked polyethylene insulated cable for transmission adapted to new energy facilities according to claim 2, characterized in that, The gas supply head assembly (001) includes: The spiral connector (12) has a spiral groove (13) at one end. The end of the hollow spiral heat sink (6) can be sealed and the thread can be detachably installed in the spiral groove (13). The spiral connector (12) has an air supply hole (14) that communicates with the internal cavity of the hollow spiral heat sink (6). The gas supply pipe (15) is located on the side of the spiral connector (12) away from the hollow spiral heat dissipation core (6) and is connected to the gas supply hole (14); The gas supply cap (16) is detachably disposed on the side of the gas supply pipe (15) away from the spiral connector (12), and a cooling air inlet pipe (17) connected to the gas supply pipe (15) is provided through the gas supply cap (16).

4. The high-efficiency cross-linked polyethylene insulated cable for transmission adapted to new energy facilities according to claim 3, characterized in that, The annular gas cylinder (7) is connected to a pressurization pipe (18), and a pressurization check valve (19) is installed on the pressurization pipe (18). The annular gas cylinder (7) is also equipped with a gas pressure detection sensor (20) for detecting the gas pressure inside the annular gas cylinder (7).

5. A high-efficiency cross-linked polyethylene insulated cable for transmission adapted to new energy facilities according to claim 4, characterized in that, The hollow gas transmission docking section (002) includes: A convex positioning tube (21) is connected to the annular gas cylinder (7); The telescopic tube (22) is connected to the convex positioning tube (21) at one end and to the convex connector (23) at the other end. One end of the convex connector (23) can extend into one side of the end of the hollow detection tube (8) and be sealed and connected with the hollow detection tube (8).

6. The high-efficiency cross-linked polyethylene insulated cable for transmission adapted to new energy facilities according to claim 5, characterized in that, The annular gas cylinder (7) has several cable core positioning holes (24) for the conductor cable core (1) to pass through.

7. A high-efficiency cross-linked polyethylene insulated cable for transmission adapted to new energy facilities according to claim 6, characterized in that, Several conductor cores (1) are interlaced and wound around the hollow spiral heat dissipation core (6), so that the hollow spiral heat dissipation core (6) extends in a spiral shape, thereby increasing the contact area with the cooling gas.

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