Overhead insulated cable for power transmission network

Abstract

The invention relates to the technical field of power cables, and discloses an overhead insulated cable for a power transmission network, which comprises a conductor, a conductor shielding layer, a crosslinked polyethylene insulating layer, an insulation shielding layer, an outer shielding layer, a belting layer, an armor layer and an outer sheath, and is arranged between the crosslinked polyethylene insulating layer and the insulation shielding layer through a soaking assembly. The soaking assembly comprises an X-shaped framework, a semi-conductive nano elastomer and a nano-porous heat exchange micro-column. A heat dissipation assembly is arranged between the insulation shielding layer and the outer shielding layer, and the heat dissipation assembly comprises a double-Y-shaped communicating framework, a heat conduction insulation material and a hollow cavity; the buffer assembly is arranged between the outer shielding layer and the belting layer, the buffer assembly comprises the regular hexagon protection framework, the storage groove and the self-repairing semi-conductive elastomer, efficient soaking, stable heat dissipation and stress buffering are achieved, the high-cold overhead power transmission scene is adapted, and the application and popularization value is high.

Description

An overhead insulated cable for power transmission networks Technical Field

[0001] This invention relates to the field of power cable technology, and more particularly to an overhead insulated cable for power transmission networks. Background Technology

[0002] Overhead insulated cables are a core component of power transmission systems, widely used in overhead transmission and distribution lines, undertaking the critical task of long-distance, efficient power transmission. Traditional overhead insulated cables typically consist of a conductor, shielding layer, insulation layer, and sheathing layer. The insulation layer provides electrical isolation, the shielding layer provides a uniform electric field, and the sheathing layer protects against external environmental corrosion, making them essential infrastructure for ensuring the stable operation of power systems.

[0003] Regarding the aforementioned and existing related technologies, the inventors believe that the following defects often exist: During operation, overhead insulated cables for power transmission networks have poor thermal conductivity. Joule heat generated during conductor operation easily accumulates within the insulation layer, forming localized hot spots. This not only limits the cable's current-carrying capacity but also accelerates insulation aging and shortens its service life. Furthermore, they lack adaptability to cold environments. At low temperatures, cable materials are prone to thermal expansion and contraction stress concentration, leading to insulation layer brittleness and delamination, severely affecting electrical insulation performance and structural stability. They also suffer from low heat dissipation efficiency, lacking efficient heat transport structures, making it difficult for heat to dissipate quickly, further exacerbating the risk of heat accumulation. In addition, external protection is limited; the outer sheath only provides basic protection and cannot effectively resist icing, contamination, and UV corrosion in cold environments, easily leading to sheath aging and insulation performance degradation. Moreover, conventional cables cannot simultaneously meet the requirements for increased current-carrying capacity and cold-resistant cracking and anti-icing, failing to meet the long-term stable operation requirements of overhead power transmission in cold regions. Summary of the Invention

[0004] The technical problem to be solved by this invention is the shortcomings of existing overhead insulated cables for power transmission networks. To address this, we propose an overhead insulated cable for power transmission networks.

[0005] To achieve the above objectives, this application adopts the following technical solution: an overhead insulated cable for power transmission networks, comprising, from the inside out: a conductor, which is a tightly compressed circular conductor; a conductor shielding layer, covering the outside of the conductor; a cross-linked polyethylene insulation layer, covering the outside of the conductor shielding layer; a heat-spreading assembly, covering the outside of the cross-linked polyethylene insulation layer, the heat-spreading assembly comprising an X-shaped heat-spreading skeleton, a semi-conductive nano-elastic, and nanoporous heat-transfer micropillars; the X-shaped heat-spreading skeleton is arranged in a ring array along the circumferential direction, the inner surface of which is tightly pressed against the outer surface of the cross-linked polyethylene insulation layer, and the outer surface of which is flush with the inner surface of the insulation shielding layer; the semi-conductive nano-elastic fills the gaps between the X-shaped heat-spreading skeletons, and the nanoporous heat-transfer micropillars are embedded in the semi-conductive nano-elastic; an insulation shielding layer, covering the outside of the heat-spreading assembly; and a heat dissipation assembly, covering the outside of the insulation shielding layer, the heat dissipation assembly comprising a double Y-shaped connection. The system comprises a heat-dissipating frame, a thermally conductive insulating material, and a double-Y-shaped frame with interconnected hollow cavities. The double-Y-shaped interconnected heat-dissipating frames are arranged in a ring array along the circumference, with adjacent double-Y-shaped interconnected heat-dissipating frames forming a ring network. The inner surface of the double-Y-shaped interconnected heat-dissipating frames is tightly pressed against the outer surface of the insulating shielding layer, and the outer surface of the double-Y-shaped interconnected heat-dissipating frames is flush with the inner surface of the outer shielding layer. The intersecting gaps of the double-Y-shaped interconnected heat-dissipating frames form the double-Y-shaped frame interconnected hollow cavities, which are filled with the thermally conductive insulating material. An outer shielding layer covers the exterior of the heat dissipation assembly. A buffer assembly covers the exterior of the outer shielding layer, and the buffer assembly includes a protective frame, a receiving groove, and a self-healing semi-conductive elastomer. The protective frame is arranged in a ring array along the circumference, and the receiving groove is formed within the protective frame and filled with the self-healing semi-conductive elastomer. A wrapping layer covers the exterior of the buffer assembly. An armor layer covers the exterior of the wrapping layer. An outer sheath covers the exterior of the armor layer.

[0006] Preferably, the X-shaped heat dissipation frame is formed by two straight ribs of equal width perpendicularly intersecting, and a single X-shaped heat dissipation frame extends continuously along the cable axis.

[0007] Preferably, the semiconductive nanoelastomer is a composite material of a semiconductive grafted elastomer and a highly thermally conductive nanofiller.

[0008] Preferably, the nanoporous heat exchange micropillar is a micropillar structure that runs continuously along the cable axis and is embedded in a semiconductive nanoelastic body.

[0009] Preferably, the double-Y-shaped interconnected heat-spreading frame is formed by connecting symmetrical double-Y-shaped units through a straight middle section, and a single double-Y-shaped interconnected heat-spreading frame extends continuously along the cable axis.

[0010] Preferably, the thermally conductive insulating material is a layered composite insulating material with a modulus gradient increasing from the inside to the outside.

[0011] Preferably, the double Y-shaped skeleton connecting hollow cavity is continuously extended along the cable axis and is integrally co-extruded with the thermally conductive and insulating material.

[0012] Preferably, the protective frame is a regular hexagonal ring structure, distributed in a seamless spliced ​​ring array along the circumference.

[0013] Preferably, the self-healing semiconductive elastomer is a semiconductive elastic material doped with microcapsule self-healing agent.

[0014] Preferably, the outer sheath is made of an anti-aging material, and the outer surface is integrally formed with an oblique micro-ridge array structure.

[0015] The technical effects and advantages of this invention are as follows: In this invention, by setting a heat-equalizing component between the cross-linked polyethylene insulation layer and the insulation shielding layer, the four-way symmetrical structure of the X-shaped skeleton is used to quickly diffuse the Joule heat in the main insulation layer. Combined with the high thermal conductivity of the semi-conductive nano-elastic and the heat exchange core function of the nanoporous heat exchange micropillars, the heat conduction efficiency and circumferential heat uniformity are greatly improved. This achieves the effect of quickly eliminating local hot spots and avoiding insulation aging caused by local overheating. At the same time, the elastic filling adapts to low-temperature thermal expansion and contraction, significantly improving the current carrying capacity of the cable compared to traditional cables of the same specification. By setting up a heat dissipation component between the insulation shielding layer and the outer shielding layer, and relying on the double Y-shaped connected skeleton to form a ring-shaped heat flow network, combined with the efficient heat transfer and stress relief function of the thermally conductive insulation material, the efficiency of directional heat transport and the interlayer thermal expansion matching degree are further improved, realizing uniform and rapid heat transfer from the inside to the outside. At the same time, a buffer component is set up between the outer shielding layer and the wrapping layer. Through the mechanical support of the regular hexagonal skeleton and the stress buffering and crack repair function of the self-healing elastomer, combined with the cold resistance and aging resistance of the outer sheath and the oblique micro-ridge heat dissipation design, the low-temperature crack resistance, interlayer bonding stability and environmental protection capability are improved. This achieves the purpose of avoiding interlayer delamination, preventing high-altitude icing and contamination accumulation, and extending the service life of the cable, completely solving the core pain points of traditional high-altitude cables and meeting the practical needs of actual engineering. Attached Figure Description

[0016] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0017] Figure 1 is a schematic diagram of the overall three-dimensional unfolded structure of the present invention; Figure 2 is a schematic diagram of the overall front view structure of the present invention; Figure 3 is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 4 is a schematic diagram of the three-dimensional structure of the heat dissipation component of the present invention; Figure 5 is a schematic diagram of the three-dimensional structure of the heat dissipation component of the present invention; Figure 6 is a schematic diagram of the three-dimensional structure of the buffer component of the present invention; Figure 7 is a schematic diagram of the three-dimensional cross-sectional structure of the buffer component of the present invention.

[0018] Legend: 1. Conductor; 2. Conductor shielding layer; 3. Cross-linked polyethylene insulation layer; 4. Heat dissipation assembly; 41. X-type heat dissipation skeleton; 42. Semi-conductive nano-elastomer; 43. Nanoporous heat exchange micropillar; 5. Insulating shielding layer; 6. Heat dissipation assembly; 61. Double Y-type interconnected heat dissipation skeleton; 62. Thermally conductive insulating material; 63. Double Y-type skeleton interconnected hollow cavity; 7. Outer shielding layer; 8. Buffer assembly; 81. Protective skeleton; 82. Storage groove; 83. Self-healing semi-conductive elastomer; 9. Wrapping layer; 10. Armoring layer; 11. Outer sheath. Detailed Implementation

[0019] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0020] Referring to Figures 1-7, the present invention provides a technical solution: an overhead insulated cable for power transmission networks, comprising, from the inside out: a conductor 1, which is a compacted circular conductor; a conductor shielding layer 2, covering the outside of the conductor 1; a cross-linked polyethylene insulation layer 3, covering the outside of the conductor shielding layer 2; a heat-spreading assembly 4, covering the outside of the cross-linked polyethylene insulation layer 3, the heat-spreading assembly 4 including an X-shaped heat-spreading skeleton 41, a semi-conductive nano-elastic body 42, and nanoporous heat exchange micropillars 43; the X-shaped heat-spreading skeleton 41 is arranged in a ring array along the circumference, the inner surface is tightly pressed against the outer surface of the cross-linked polyethylene insulation layer 3, and the outer surface is flush with the inner surface of the insulation shielding layer 5; the intersecting gaps of the X-shaped heat-spreading skeleton 41 are filled with semi-conductive nano-elastic bodies 42, and nanoporous heat exchange micropillars 43 are embedded in the semi-conductive nano-elastic bodies 42; an insulation shielding layer 5, covering the outside of the heat-spreading assembly 4; and a heat dissipation assembly 6, covering the outside of the insulation shielding layer 5, the heat dissipation assembly 6 including a double Y-shaped interconnected heat-spreading skeleton 61. The structure consists of a thermally conductive insulating material 62 and a double-Y-shaped frame connecting hollow cavity 63; the double-Y-shaped connecting heat-dissipating frames 61 are arranged in a ring array along the circumference, and adjacent double-Y-shaped connecting heat-dissipating frames 61 are connected to form a ring network, with the inner surface tightly pressed against the outer surface of the insulating shielding layer 5, and the outer surface flush with the inner surface of the outer shielding layer 7; the intersecting gaps of the double-Y-shaped connecting heat-dissipating frames 61 form the double-Y-shaped frame connecting hollow cavity 63, which is filled with thermally conductive insulating material 62; the outer shielding layer 7 covers the heat dissipation... The outer part of component 6; buffer component 8, which covers the outer part of the outer shielding layer 7, includes a protective skeleton 81, a storage groove 82 and a self-healing semi-conductive elastomer 83; the protective skeleton 81 is arranged in a ring array along the circumference, and the storage groove 82 is opened in the protective skeleton 81 and filled with the self-healing semi-conductive elastomer 83; wrapping layer 9, which covers the outer part of the buffer component 8; armor layer 10, which covers the outer part of the wrapping layer 9; outer sheath 11, which covers the outer part of the armor layer 10.

[0021] Referring to Figures 1-7, in this embodiment: the X-shaped heat-spreading frame 41 is formed by two straight ribs of equal width perpendicularly intersecting, and a single X-shaped heat-spreading frame 41 extends continuously along the cable axis. The semi-conductive nano-elastic body 42 is a composite material of semi-conductive grafted elastomer and high thermal conductivity nanofiller. The nanoporous heat exchange micropillar 43 is a micropillar structure that extends continuously along the cable axis and is embedded in the semi-conductive nano-elastic body 42. The surface nanoporous anodized coating provides the heat exchange core, further enhancing the heat spread efficiency.

[0022] The double-Y-shaped interconnected heat-equalizing frame 61 is formed by connecting symmetrical double-Y-shaped units through a straight section in the middle. Each double-Y-shaped interconnected heat-equalizing frame 61 extends continuously along the cable axis. The thermally conductive insulating material 62 is a layered composite insulating material with a modulus gradient from the inside to the outside. The double-Y-shaped frame interconnected hollow cavity 63 is continuously penetrated along the cable axis and is integrally co-extruded with the thermally conductive insulating material 62 to achieve efficient and uniform heat transfer from the main insulation layer to the outer shielding layer 7, avoiding insulation aging caused by heat accumulation.

[0023] The protective frame 81 is a regular hexagonal ring structure, distributed in a seamless spliced ​​ring array along the circumference. The self-healing semi-conductive elastomer 83 is a semi-conductive elastic material doped with microcapsule self-healing agent. Its semi-conductive properties ensure a uniform electric field and eliminate electrical safety hazards.

[0024] The outer sheath 11 is made of anti-aging material, and the outer surface is integrally molded with an oblique micro-ridge array structure to protect the internal structure from environmental erosion.

[0025] Working principle: Conductor 1 is the innermost conductive core of the cable. It is a tightly compressed round conductor 1 made of multiple strands of oxygen-free copper or aluminum wire. The compression process reduces the outer diameter of the cable, reduces the skin effect, reduces conductor oxidation and contact resistance, and improves conductivity. The outer surface of conductor 1 is tightly pressed against the inner surface of conductor shielding layer 2, which lays the foundation for stable conductivity and uniform electric field of the cable.

[0026] The conductor shielding layer 2 covers the outside of the conductor 1 and is made of semi-conductive cross-linked polyethylene. It is integrally formed by extrusion process and is used to uniformly shape the electric field on the surface of the conductor 1, avoid partial discharge at the interface between the conductor 1 and the insulation layer, and ensure the stability of the electrical insulation of the cable. The outer surface of the conductor shielding layer 2 is closely attached to the inner surface of the cross-linked polyethylene insulation layer 3, providing a uniform electric field foundation for the insulation layer and ensuring continuous heat flow.

[0027] The cross-linked polyethylene insulation layer 3 covers the outside of the conductor shielding layer 2. It is made of modified XLPE material that is dry cross-linked or chemically cross-linked. As the main insulation, it undertakes the core electrical insulation function and blocks the electrical path between the conductor 1 and the outside. The outer surface of the cross-linked polyethylene insulation layer 3 is tightly pressed against the inner surface of the heat-spreading component 4 to conduct the Joule heat generated by the conductor 1 outward and provide a mounting base for the heat-spreading component 4.

[0028] The heat-spreading component 4 is wrapped around the outside of the cross-linked polyethylene insulation layer 3 and disposed between the cross-linked polyethylene insulation layer 3 and the insulation shielding layer 5. It includes an X-shaped heat-spreading skeleton 41, a semi-conductive nano-elastomer 42, and nanoporous heat exchange micropillars 43. The four-way symmetrical structure can quickly and evenly diffuse the Joule heat accumulated in the cross-linked polyethylene insulation layer 3 to the surrounding area, completely eliminating local hot spots and avoiding insulation aging caused by local overheating. The cross gaps of the X-shaped heat-spreading skeleton 41 are filled with semi-conductive nano-elastomers 42. This composite elastomer has both semi-conductive and high thermal conductivity to enhance heat conduction efficiency, quickly homogenize the Joule heat of conductor 1, and has high elasticity. The nanoporous heat exchange micropillars 43 embedded in the semi-conductive nano-elastomers 42 provide heat exchange cores through the nanoporous anodic oxide coating on the surface, further enhancing the heat-spreading efficiency. At the same time, it serves as a stress buffer structure to reduce interlayer stress concentration caused by low-temperature contraction and prevent the generation of microcracks in the insulation layer.

[0029] The insulating shielding layer 5 covers the outside of the heat dissipation component 4. It is made of semi-conductive XLPE material and is integrally extruded. It is used to uniformly cross-linked polyethylene insulation layer 3 surface electric field to avoid partial discharge. The outer surface of the insulating shielding layer 5 is tightly pressed against the inner surface of the heat dissipation component 6 to conduct the heat transferred by the heat dissipation component 4 outward and provide a mounting base for the heat dissipation component 6.

[0030] The heat dissipation component 6 covers the outside of the insulating shielding layer 5 and is disposed between the insulating shielding layer 5 and the outer shielding layer 7. It includes a double Y-shaped interconnected heat-spreading frame 61, a thermally conductive insulating material 62, and a double Y-shaped frame interconnected hollow cavity 63. Adjacent units are connected by a straight section in the middle to form a ring-shaped heat flow network, which efficiently transports the heat transferred by the insulating shielding layer 5 to the outside. The cross gaps of the double Y-shaped interconnected heat-spreading frame 61 form a double Y-shaped frame interconnected hollow cavity 63. The hollow cavity is continuously connected along the axial direction and is filled with a thermally conductive insulating material 62. The modulus of this material increases from the inside to the outside, perfectly matching the thermal expansion coefficients of the inner and outer layers, completely eliminating low-temperature shrinkage stress. At the same time, the dispersed high thermal conductivity nanofillers in each layer further enhance the outward conduction of heat, realizing the efficient and uniform transfer of heat from the main insulating layer to the outer shielding layer, and avoiding insulation aging caused by heat accumulation.

[0031] The outer shielding layer 7 covers the outside of the heat dissipation component 6. It is made of semi-conductive XLPE material and is integrally extruded to further homogenize the electric field and avoid partial discharge on the surface of the insulation layer. The outer surface of the outer shielding layer 7 is tightly pressed against the inner surface of the buffer component 8 to conduct the heat transferred by the heat dissipation component 6 to the outside and provide a mounting base for the buffer component 8.

[0032] The buffer assembly 8 is wrapped around the outer shielding layer 7 and is located between the outer shielding layer 7 and the wrapping layer 9. It includes a protective skeleton 81, a receiving groove 82, and a self-healing semi-conductive elastomer 83. The protective skeleton 81 is a regular hexagonal ring structure, which provides uniform mechanical support for the cable and disperses interlayer stress. The receiving groove 82 inside the protective skeleton 81 is filled with a self-healing semi-conductive elastomer 83. When the cable generates interlayer stress or microcracks due to thermal expansion and contraction and laying bending, the elastomer automatically deforms to compensate for the stress, and the microcapsule self-healing agent is automatically released to complete the microcrack repair, avoiding interlayer delamination and insulation failure. At the same time, the semi-conductive properties ensure a uniform electric field and eliminate electrical safety hazards.

[0033] The wrapping layer 9 covers the outside of the buffer assembly 8, and is formed by wrapping with non-woven fabric or polyester tape. It is used to isolate the buffer assembly 8 from the armor layer 10, and plays a role in moisture protection, buffering, and protection against mechanical damage. At the same time, it improves the structural stability of the cable and avoids the internal structure from being affected by external mechanical forces. The armor layer 10 covers the outside of the wrapping layer 9, and adopts a double-layer steel tape wrapping or steel wire armor structure, which greatly improves the mechanical strength of the cable, resists tensile and compressive forces, and is suitable for various laying scenarios such as overhead, underground, and tunnel. It protects the internal structure from mechanical damage and ensures the cable's performance in complex environments. Structural integrity under operating conditions; the outer sheath 11 covers the outside of the armor layer 10 and is made of anti-aging materials such as cold-resistant superhydrophobic TPV and halogen-free low-smoke flame-retardant polyolefin. The outer surface is integrally formed with an axially equidistant oblique micro-ridge array; the outer sheath 11 resists the corrosion of low temperature, ultraviolet rays, salt spray and other factors in high-altitude and cold environments through cold-resistant and anti-aging materials. At the same time, the oblique micro-ridge array realizes directional water conduction and heat dissipation, prevents icing and dirt accumulation in high-altitude and cold environments, avoids insulation aging caused by heat accumulation and icing of the outer layer, and comprehensively protects the internal structure from environmental corrosion, ensuring the long-term stable operation of the cable.

[0034] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. An overhead insulated cable for power transmission networks, characterized in that, From the inside out, the components are as follows: a conductor, which is a tightly compressed circular conductor; a conductor shielding layer, covering the outside of the conductor; a cross-linked polyethylene insulation layer, covering the outside of the conductor shielding layer; a heat spreader assembly, covering the outside of the cross-linked polyethylene insulation layer, the heat spreader assembly including an X-shaped heat spreader framework, a semi-conductive nano-elastic body, and nanoporous heat exchange micropillars; the intersecting gaps of the X-shaped heat spreader framework are filled with the semi-conductive nano-elastic body, and the nanoporous heat exchange micropillars are embedded in the semi-conductive nano-elastic body; an insulating shielding layer, covering the outside of the heat spreader assembly; and a heat dissipation assembly, covering the outside of the insulating shielding layer, the heat dissipation assembly including a double Y-shaped interconnected heat spreader framework and a thermally conductive insulating material. The material and the double Y-shaped skeleton are connected to the hollow cavity; adjacent double Y-shaped connected heat dissipation skeletons are connected to form a ring network, and the intersection gap of the double Y-shaped connected heat dissipation skeletons forms the double Y-shaped skeleton connected hollow cavity, which is filled with the thermally conductive insulating material; an outer shielding layer covers the outside of the heat dissipation component; a buffer component covers the outside of the outer shielding layer, the buffer component includes a protective skeleton, a storage groove and a self-healing semi-conductive elastomer; the protective skeleton has the storage groove, which is filled with the self-healing semi-conductive elastomer; a wrapping layer covers the outside of the buffer component; an armor layer covers the outside of the wrapping layer; and an outer sheath covers the outside of the armor layer.

2. The overhead insulated cable for power transmission networks according to claim 1, characterized in that: The inner surface of the X-shaped heat-spreading frame is tightly pressed against the outer surface of the cross-linked polyethylene insulation layer. The outer surface of the X-shaped heat-spreading frame is flush with the inner surface of the insulation shielding layer. The X-shaped heat-spreading frame is formed by two straight ribs of equal width perpendicularly intersecting, and a single X-shaped heat-spreading frame extends continuously along the cable axis.

3. The overhead insulated cable for power transmission networks according to claim 1, characterized in that: The semiconductive nanoelastomer is a composite material of a semiconductive grafted elastomer and a highly thermally conductive nanofiller.

4. The overhead insulated cable for power transmission networks according to claim 1, characterized in that: The nanoporous heat exchange micropillars are micropillar structures that run continuously along the cable axis and are embedded in a semi-conductive nanoelastic body.

5. The overhead insulated cable for power transmission networks according to claim 1, characterized in that: The inner surface of the double Y-shaped interconnected heat-spreading frame is tightly pressed against the outer surface of the insulating shielding layer. The outer surface of the double Y-shaped interconnected heat-spreading frame is flush with the inner surface of the outer shielding layer. The double Y-shaped interconnected heat-spreading frame is formed by symmetrical double Y-shaped units connected by a straight section in the middle. A single double Y-shaped interconnected heat-spreading frame extends continuously along the cable axis.

6. The overhead insulated cable for power transmission networks according to claim 1, characterized in that: The thermally conductive insulating material is a layered composite insulating material with a modulus gradient increasing from the inside to the outside.

7. The overhead insulated cable for power transmission networks according to claim 1, characterized in that: The double Y-shaped skeleton connects the hollow cavity continuously along the cable axis and is integrally co-extruded with the thermally conductive and insulating material.

8. The overhead insulated cable for power transmission networks according to claim 1, characterized in that: The protective frame is a regular hexagonal ring structure, distributed in a seamless spliced ​​ring array along the circumference.

9. The overhead insulated cable for power transmission networks according to claim 1, characterized in that: The self-healing semi-conductive elastomer is a semi-conductive elastic material doped with microcapsule self-healing agents.

10. The overhead insulated cable for power transmission networks according to claim 1, characterized in that: The outer sheath is made of anti-aging material, and its outer surface is integrally formed with an oblique micro-prism array structure.

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