High-altitude weather-resistant anti-breakdown anti-corrosion power cable and preparation method thereof

Abstract

The application discloses a kind of highland weather-resistant anti-breakdown corrosion-resistant power cable and preparation method, it is related to cable structure optimization technical field, including the cable core, braided shielding layer, waterproof layer, isolation inner liner, high-strength armoring layer and ultraviolet-resistant anticorrosion outer sheath sequentially arranged from inside to outside;Cable core includes conductor, conductor shielding layer, modified weather-resistant insulation layer and insulation shielding layer sequentially arranged from inside to outside, and a plurality of cable cores are filled with non-hygroscopic low-temperature resistant filling glue;The present application optimizes cable hierarchical structure, uses modified polymer material, solves the problems of existing cable high-altitude corona breakdown, ultraviolet aging, low-temperature brittle fracture, mechanical damage and the like;Through composite shielding, buffer armoring structure, improve the environmental adaptability of cable, reduce operation and maintenance replacement cost, meet the demand of long-term stable power transmission in plateau.

Description

Technical Field

[0001] The invention relates to the field of cable structure optimization technology, specifically to a high-altitude weather-resistant, puncture-resistant, and corrosion-resistant power cable and its preparation method. Background Technology

[0002] The altitude of plateau regions is generally above 3000m, with harsh natural environments, low atmospheric pressure, and thin air. Corona discharge easily occurs on the surface of cable insulation, making conventional cables prone to insulation breakdown and creepage aging faults. The intensity of ultraviolet radiation is high, with annual ultraviolet radiation being 2-3 times that of plains areas. Ordinary sheath materials are prone to aging, cracking, powdering, and falling off. The temperature difference between day and night is extremely large, with extreme low temperatures reaching -45℃. Conventional polymer materials become more brittle and are prone to breakage when bent at low temperatures. The geological conditions are complex, and cables are easily damaged by tensile, compressive, and bending forces during construction and laying.

[0003] Currently, conventional high-altitude-specific cables on the market have a simple structural design and prominent technical defects, making them unsuitable for harsh high-altitude conditions: First, poor insulation performance: ordinary cross-linked polyethylene insulation material has weak resistance to low-pressure breakdown, severe corona discharge at high altitudes, and the insulation layer is prone to aging and failure, resulting in a short service life; Second, insufficient weather resistance: conventional sheaths have poor resistance to ultraviolet rays and low temperatures, hardening and cracking after long-term exposure to sunlight and low-temperature freeze-thaw cycles, reducing waterproof and moisture-proof capabilities, and allowing moisture to penetrate the cable core and cause short-circuit faults; Third, simple protective structure: lacking dedicated shielding and buffer protection structures, the cable body is easily damaged by wind and sand abrasion and geological compression, and its resistance to electromagnetic interference is weak, affecting the stability of power transmission; Fourth, poor mechanical properties: low tensile and compressive strength, making it prone to tensile deformation and breakage when laid in complex high-altitude terrain, resulting in a low construction error tolerance rate. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention discloses a high-altitude weather-resistant, breakdown-resistant, and corrosion-resistant power cable and its preparation method. By optimizing the cable's layer structure and using modified polymer materials, it solves the problems of high-altitude corona breakdown, ultraviolet aging, low-temperature brittle fracture, and mechanical damage in existing cables. Through composite shielding and buffer armor structures, it improves the cable's environmental adaptability, reduces operation and maintenance replacement costs, and meets the long-term stable power transmission needs of high-altitude areas.

[0005] The technical solution of the present invention is as follows: This invention discloses a high-altitude weather-resistant, puncture-resistant, and corrosion-resistant power cable, comprising, from the inside out, a cable core, a braided shielding layer, a waterproof layer, an insulating inner lining layer, a high-strength armor layer, and an anti-ultraviolet corrosion outer sheath; The cable core includes, from the inside out, a conductor, a conductor shielding layer, a modified weather-resistant insulation layer, and an insulation shielding layer. The spaces between multiple cable cores are filled with a non-hygroscopic, low-temperature resistant filler. The modified weather-resistant insulation layer is a modified cross-linked polyethylene material, which is made by irradiation cross-linking after blending low-density polyethylene, cross-linking agent, nano-alumina anti-breakdown filler, low-temperature polyolefin elastomer toughening agent, ultraviolet absorber, and antioxidant.

[0006] In some embodiments of the present invention, the modified cross-linked polyethylene material comprises, by weight percentage, the following components: 72-78% low-density polyethylene, 2-3% cross-linking agent, 7-9% nano-alumina anti-penetration filler, 6-7% low-temperature polyolefin elastomer toughening agent, 3-5% ultraviolet absorber, and 3-5% antioxidant.

[0007] In some embodiments of the present invention, the conductor is made of multiple strands of oxygen-free tin-plated copper wires twisted together, with a tin plating thickness of 0.02-0.05 mm and a twisting pitch of 12-15 times the outer diameter of the conductor.

[0008] In some embodiments of the present invention, both the conductor shielding layer and the insulating shielding layer are semi-conductive cross-linked polyolefin materials, the thickness of the conductor shielding layer is 0.8-1.2 mm, and the thickness of the insulating shielding layer is 0.6-1.0 mm.

[0009] In some embodiments of the present invention, the braided shielding layer is braided with tin-plated copper wire and the braiding density is ≥92%.

[0010] In some embodiments of the present invention, the waterproof layer is a longitudinally wrapped aluminum-plastic composite strip with a longitudinal overlap rate of ≥25%, and the aluminum foil side is arranged facing the woven shielding layer.

[0011] In some embodiments of the present invention, the insulating liner is extruded from high-density polyethylene material and is used to isolate the high-strength armor layer from the woven shielding layer.

[0012] In some embodiments of the present invention, the high-strength armor layer is made by wrapping hot-dip galvanized steel strip around the cable along the axial gap, and the width of the gap is not greater than 50% of the width of the steel strip.

[0013] In some embodiments of the present invention, the UV-resistant and corrosion-resistant outer sheath is made of modified polyolefin material, and by mass percentage, it contains 1-2% nano-titanium dioxide UV-resistant filler, 3-6% flake talc anti-corrosion filler, and 3-6% weather-resistant stabilizer.

[0014] This invention also discloses a method for preparing a high-altitude weather-resistant, puncture-resistant, and corrosion-resistant power cable, comprising the following steps: Multiple strands of oxygen-free tin-plated copper wire are twisted together to obtain a conductor. A conductor shielding layer, a modified weather-resistant insulation layer, and an insulation shielding layer are extruded onto the conductor from the inside out to obtain a cable core. A braided shielding layer is woven on the outer surface of the cable core. Then, a waterproof layer, an extruded inner lining layer, and a high-strength armor layer are sequentially wrapped on the outer surface of the braided shielding layer. Finally, an anti-ultraviolet and anti-corrosion outer sheath is extruded to obtain the power cable.

[0015] One or more technical solutions of the present invention have the following beneficial effects: (1) The power cable of the present invention has high-altitude breakdown resistance. By adopting a modified weather-resistant insulation layer and a double-layer semi-conductive shielding structure (i.e., conductor shielding layer and insulation shielding layer), the electric field distribution inside the cable is effectively balanced, and the corona discharge phenomenon that is prone to occur in low-pressure environments is significantly suppressed, thereby increasing the overall breakdown strength of the cable by more than 40%. It solves the technical problem of breakdown and short circuit caused by accelerated insulation aging in power cables in plateau areas, and ensures the long-term safety and reliability of power transmission.

[0016] (2) The power cable of the present invention is extremely weather-resistant and adaptable to high-altitude environments. Its inner and outer key materials have undergone special low-temperature resistance and UV resistance modification treatment. Specifically, the cable can maintain normal electrical and mechanical properties in extreme cold environments down to -55°C, while its radiation resistance index corresponding to its UV aging resistance is significantly improved. Thanks to these material-level optimizations, the service life of the cable under harsh conditions such as strong ultraviolet radiation and large temperature differences at high altitudes is greatly extended, effectively reducing the replacement and maintenance costs throughout its entire life cycle.

[0017] (3) The power cable of the present invention has dual waterproof and anti-corrosion protection performance. Its structural design adopts a dual waterproof barrier combining aluminum-plastic composite waterproof strip and isolation inner lining layer, and is further matched with an anti-corrosion modified anti-ultraviolet outer sheath. This composite protection system can synergistically resist corrosive environmental factors such as permafrost and saline alkali erosion in plateau areas and seasonal condensation and humidity, fundamentally eliminating various operational failures caused by conductor oxidation, insulation dampness or water vapor penetration, and improving the environmental adaptability of the cable.

[0018] (4) The power cable of the present invention has strong mechanical protection capabilities, and it adopts a high-performance galvanized steel strip armor structure. This structure greatly enhances the overall tensile strength, compressive strength and wear resistance of the cable, making it well-suited to the rugged and geologically complex terrain conditions of plateau regions. As a result, the cable can effectively resist the impact of strong winds carrying sand and gravel, and physical damage that may be caused by geological subsidence or compression, ensuring the physical integrity and long-term stability of the line.

[0019] (5) The power cable of the present invention is interference-resistant and has stable power transmission. It is equipped with a shielding layer made of high-density copper wire braid. This shielding layer can effectively isolate external electromagnetic field interference and internal static electricity accumulation, significantly reducing additional losses and signal distortion during power transmission. This feature is crucial for ensuring the power supply quality and stability of photovoltaic power stations, industrial and mining enterprises, and remote pastoral areas in plateau regions, ensuring efficient and clean power transmission.

[0020] (6) The power cable of the present invention has high adaptability to construction. Its overall structural design takes into account both flexibility and strength, and has a small allowable bending radius and a moderate unit weight. These characteristics make the cable more convenient and efficient to lay, whether by manual labor or with the help of light machinery, in high-altitude and low-oxygen environments. This significantly reduces the construction difficulty and labor intensity of cable laying in high-altitude and low-oxygen environments, and also reduces the complexity and overall cost of subsequent operation and maintenance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the single-core structure of the high-altitude weather-resistant, puncture-resistant, and corrosion-resistant power cable of the present invention.

[0022] In the diagram: 1. Conductor; 2. Conductor shielding layer; 3. Modified weather-resistant insulation layer; 4. Insulating shielding layer; 5. Braided shielding layer; 6. Waterproof layer; 7. Insulating inner lining layer; 8. High-strength armor layer; 9. UV-resistant and corrosion-resistant outer sheath. Detailed Implementation

[0023] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is intended to include the plural form as well. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0025] Example 1 In a typical embodiment of the present invention, a high-altitude weather-resistant, puncture-resistant, and corrosion-resistant power cable is proposed, such as... Figure 1As shown, the cable core includes, from the inside out, a braided shielding layer 5, a waterproof layer 6, an insulating inner lining layer 7, a high-strength armor layer 8, and an anti-ultraviolet and anti-corrosion outer sheath 9. The cable core includes, from the inside out, a conductor 1, a conductor shielding layer 2, a modified weather-resistant insulation layer 3, and an insulation shielding layer 4. This multi-layer composite structure design is designed to work together to address the harsh environmental challenges of high-altitude areas.

[0026] In this embodiment, conductor 1 is made of multiple strands of oxygen-free tin-plated copper wires twisted together, with a tin plating layer thickness of 0.02-0.05mm. This tin plating layer can effectively prevent the copper conductor from oxidizing and improve the welding performance. The twisting pitch is controlled at 12-15 times the outer diameter of the conductor, which can prevent the conductor from oxidizing and corroding in the humid and saline environment of the plateau. The conductor has high flexibility and a small bending radius, making it suitable for laying in complex terrain of the plateau.

[0027] In this embodiment, the conductor shielding layer 2 uses existing semi-conductive cross-linked polyolefin material, mainly comprising a polyolefin matrix, conductive carbon black, and a cross-linking agent. The polyolefin matrix provides excellent electrical insulation and mechanical support, while the conductive carbon black, as a key functional filler, is uniformly dispersed in the matrix to form a three-dimensional conductive network, which is the core for achieving stable semi-conductive performance. The cross-linking agent, through a chemical cross-linking reaction, enables the material to form a stable three-dimensional network structure, thereby significantly improving its thermal stability, mechanical strength, and resistance to environmental stress cracking, ensuring long-term reliable operation in harsh environments with large diurnal temperature differences and strong ultraviolet radiation at high altitudes. The semi-conductive cross-linked polyolefin material is uniformly extruded onto the outside of the conductor, with a thickness of 0.8-1.2 mm, a smooth surface without protrusions, and a uniform electric field distribution, avoiding conductor tip discharge under high-altitude and low-pressure environments, suppressing corona generation, and reducing the risk of local breakdown of the insulation layer. If the conductor shielding layer 2 is too thin, it will cause severe distortion of the electric field, a surge in local electric field strength, and insufficient extension when the cable is bent, leading to cracking and excessive partial discharge. If the thickness is too large, it will result in poor thermal conductivity of the semiconducting layer, high conductor temperature during long-term operation, accelerated thermal aging of insulation, reduced flexibility and increased cost.

[0028] In this embodiment, the modified weather-resistant insulation layer 3 is a modified cross-linked polyethylene material, comprising the following components by mass percentage: 72-78% low-density polyethylene, which serves as the base resin to provide good electrical insulation properties and processing fluidity; 2-3% cross-linking agent, used to initiate cross-linking of polyethylene molecular chains to form a three-dimensional network structure, thereby significantly improving the material's heat resistance, mechanical strength, and resistance to environmental stress cracking; 7-9% nano-alumina anti-breakdown filler, which is uniformly dispersed in the matrix and utilizes its high dielectric strength and thermal conductivity to effectively improve the insulation layer's anti-breakdown field strength and partial discharge initiation voltage, and improve heat dissipation; 6-7% low-temperature polyolefin elastomer toughening agent, used to maintain the material's flexibility and impact resistance under extreme low-temperature conditions and prevent brittleness; 3-5% ultraviolet absorber, used to absorb and dissipate the energy of strong ultraviolet radiation at high altitudes, slowing down the photo-oxidative aging process of the material; and 3-5% antioxidant, used to inhibit the material's thermo-oxidative aging at long-term operating temperatures and during processing, ensuring the long-term stability of the insulation layer.

[0029] Preferably, the modified weather-resistant insulation layer 3, by weight percentage, comprises the following components: 75% low-density polyethylene, 2.5% crosslinking agent, 8% nano-alumina anti-breakdown filler, 6.5% low-temperature polyolefin elastomer toughening agent, 4% ultraviolet absorber, and 4% antioxidant. The absence of nano-alumina anti-breakdown filler easily leads to air gap discharge, resulting in poor resistance to partial discharge and easy insulation breakdown under high voltage operation. The lack of toughening agent easily leads to insufficient toughness of the material under low-temperature conditions, making it prone to brittleness in low-temperature environments. The lack of antioxidant easily leads to thermo-oxidative aging upon contact with air, accelerating aging and failure under high-temperature conditions. The thickness of the modified weather-resistant insulation layer 3 varies according to different voltage levels and specifications, and it undergoes irradiation crosslinking treatment. After modification, the material's breakdown strength is improved, its low-temperature embrittlement temperature is ≤-55℃, its insulation resistivity is stable under low-pressure environments, and it effectively suppresses corona creepage.

[0030] In this embodiment, the insulating shielding layer 4 is a semi-conductive cross-linked polyolefin material. Semi-conductive properties are achieved by adding conductive carbon black particles. Its thickness is 0.6-1.0 mm, and it adheres tightly to the insulating layer, eliminating air gaps on the insulating layer surface and balancing the external electric field. Simultaneously, it blocks external electromagnetic interference, improves power transmission stability, and is suitable for high-altitude, open environments with strong electromagnetic radiation. If the thickness of the insulating shielding layer is too small, the adhesion deteriorates, air gaps easily form at the interface, the electric field distribution becomes uneven, local field strength increases, and partial discharge increases, posing a risk of insulation breakdown during long-term operation. If the thickness is too large, the overall thermal resistance increases, hindering heat dissipation during cable operation, leading to higher conductor operating temperatures, accelerated insulation thermal aging, increased raw material consumption, and higher production costs.

[0031] When the cable is a multi-core cable, the spaces between the multiple cores are filled with a non-hygroscopic, low-temperature resistant filler. The non-hygroscopic, low-temperature resistant filler is a mesh polypropylene, which is non-hygroscopic and low-temperature resistant. After filling the gaps between the cores, there are no voids, it does not absorb water, and it does not harden or shrink at low temperatures. It can effectively prevent performance degradation caused by low-temperature shrinkage or moisture intrusion into the conductor.

[0032] In this embodiment, the braided shielding layer 5 is made of tin-plated copper wire with a braiding density of ≥92%, forming a closed electromagnetic shielding mesh. The high-density braided structure provides excellent electromagnetic shielding effect, effectively attenuating external electromagnetic interference and suppressing internal electromagnetic radiation. The tin plating treatment improves the corrosion resistance of the copper wire, effectively resisting static electricity from high-altitude winds and sand, and spatial electromagnetic wave interference, avoiding current fluctuations, ensuring power transmission accuracy, and assisting in grounding and current diversion to improve power safety.

[0033] In this embodiment, the waterproof layer 6 is a longitudinally wrapped aluminum-plastic composite strip with a thickness of 0.05mm. It has radial waterproofing capability, blocks condensation and water vapor penetration at high altitudes, and can also buffer external pressure and impact forces to protect the internal cable core. The longitudinal overlap rate of the longitudinally wrapped aluminum-plastic composite strip is ≥25% to ensure longitudinal water tightness. The aluminum foil side is set facing the braided shielding layer 5. The good shielding performance of the aluminum layer and the design with the metal side facing inward enhance the protection against electromagnetic interference. At the same time, the composite structure also has a mechanical buffering effect.

[0034] In this embodiment, the insulating inner liner 7 is extruded from high-density polyethylene material. The extrusion thickness of the insulating inner liner 7 varies according to different voltage levels and specifications. The main function of this layer is to isolate the high-strength armor layer 8 from the braided shielding layer 5, prevent the metal edges of the armor layer from damaging the inner shielding layer under mechanical stress, and provide a certain radial buffer. In addition, it can also enhance the sealing and waterproof performance and prevent salt and alkali corrosion of the inner cable core.

[0035] In this embodiment, the high-strength armor layer 8 is made of hot-dip galvanized steel strip wrapped around the cable along the axial gap. It has functions of resisting compression, tension, crushing, and rodent bites, making it suitable for laying in rugged terrain, resisting wind and sand impacts and geological compression damage, and improving the mechanical protection performance of the cable. The width of the wrapping gap is no more than 50% of the width of the steel strip. This gap wrapping method provides high mechanical strength and protection against external compression and impact while maintaining a certain degree of bending flexibility of the cable. The hot-dip galvanizing treatment enhances the corrosion resistance of the steel strip.

[0036] In this embodiment, the UV-resistant and corrosion-resistant outer sheath 9 is made of modified polyolefin material. By mass percentage, it contains 1-2% nano-titanium dioxide UV-resistant filler, 3-6% flake talc anti-corrosion filler, and 3-6% weather stabilizer. This mainly includes carbon black material that absorbs UV light and long-lasting weather-resistant light stabilizers. Nano-titanium dioxide efficiently reflects and scatters ultraviolet rays, significantly improving the weather resistance of the outer sheath. The layered structure of the flake talc effectively blocks the penetration of corrosive media, jointly achieving the outer sheath's excellent resistance to UV aging and chemical corrosion. The sheath thickness varies depending on the voltage level and specifications. It can withstand long-term UV exposure, wind and sand abrasion, salt and alkali corrosion, and is rodent and insect resistant. It does not powder or crack with long-term use and is suitable for ambient temperatures from -55℃ to 70℃, making it suitable for harsh environments in high-altitude regions throughout the year.

[0037] The power cable provided in this embodiment achieves comprehensive adaptability to the extreme environment of high-altitude areas through the synergy of material modification and structural innovation. The modified weather-resistant insulation layer incorporates nano-alumina anti-breakdown filler, increasing the breakdown strength by over 40%. Combined with a double-layer semi-conductive shield and a tin-plated copper wire braided layer with a density ≥92%, it effectively suppresses corona discharge under low-pressure environments, ensuring transmission stability. The addition of low-temperature polyolefin elastomer toughening agents and UV absorbers to the insulation layer, along with the nano-titanium dioxide and flake talc compound system in the outer sheath, endows the cable with excellent weather resistance. Its low-temperature embrittlement temperature is ≤-55℃, its UV aging resistance is significantly improved, and its service life is extended to over 25 years. Structurally, the longitudinally wrapped aluminum-plastic composite tape and high-density polyethylene lining form a double waterproof barrier, preventing salt and alkali corrosion. The hot-dip galvanized steel strip gap-wrapped armor provides high lateral pressure resistance while retaining bending flexibility, adapting to complex terrain laying conditions. This invention solves the problems of high-altitude cables being prone to breakdown, cracking, and short lifespan, and provides excellent comprehensive protection, greatly reducing the power operation and maintenance costs in high-altitude areas.

[0038] Example 2 In a typical embodiment of the present invention, a method for preparing a high-altitude weather-resistant, puncture-resistant, and corrosion-resistant power cable is provided, comprising the following steps: First, multiple strands of oxygen-free tin-plated copper wire are stranded to obtain a conductor; then, a conductor shielding layer, a modified weather-resistant insulation layer, and an insulation shielding layer are sequentially extruded onto the conductor from the inside out to form the core insulation core of the cable; next, a tin-plated copper wire shielding layer is braided on the outer surface of the insulation shielding layer to construct a braided shielding layer; then, aluminum-plastic composite tape is sequentially wrapped around the braided shielding layer as a waterproof layer, high-density polyethylene is extruded as an insulating inner lining layer, and hot-dip galvanized steel tape is wrapped around it as a high-strength armor layer, thereby completing the construction of the waterproof, insulating, and mechanical protection structure; finally, an anti-ultraviolet corrosion outer sheath is extruded to complete the overall encapsulation and external protection of the cable.

[0039] When the power cable has a multi-core structure, non-hygroscopic, low-temperature resistant filler glue is filled between the multiple cores, and then a tinned copper wire shielding layer is woven in sequence, a longitudinally wrapped aluminum-plastic composite waterproof layer is wrapped, a high-density polyethylene isolation inner lining layer is extruded, a hot-dip galvanized steel strip high-strength armor layer is wrapped, and finally an anti-ultraviolet corrosion outer sheath is extruded.

[0040] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A high-altitude, weather-resistant, puncture-resistant, and corrosion-resistant power cable, characterized in that, It includes, from the inside out, the cable core, braided shielding layer, waterproof layer, insulating inner lining layer, high-strength armor layer, and UV-resistant and corrosion-resistant outer sheath; The cable core includes, from the inside out, a conductor, a conductor shielding layer, a modified weather-resistant insulation layer, and an insulation shielding layer, with non-hygroscopic, low-temperature resistant filler glue filling the spaces between multiple cable cores; wherein, the modified weather-resistant insulation layer is a modified cross-linked polyethylene material, which is made by irradiation cross-linking after blending low-density polyethylene, cross-linking agent, nano-alumina anti-breakdown filler, low-temperature polyolefin elastomer toughening agent, ultraviolet absorber and antioxidant.

2. The high-altitude weather-resistant, puncture-resistant, and corrosion-resistant power cable as described in claim 1, characterized in that, The modified cross-linked polyethylene material comprises the following components by mass percentage: 72-78% low-density polyethylene, 2-3% cross-linking agent, 7-9% nano-alumina anti-penetration filler, 6-7% low-temperature polyolefin elastomer toughening agent, 3-5% ultraviolet absorber, and 3-5% antioxidant.

3. The high-altitude weather-resistant, puncture-resistant, and corrosion-resistant power cable as described in claim 1, characterized in that, The conductor is made of multiple strands of oxygen-free tin-plated copper wire, with a tin plating thickness of 0.02-0.05 mm and a stranding pitch of 12-15 times the outer diameter of the conductor.

4. The high-altitude weather-resistant, puncture-resistant, and corrosion-resistant power cable as described in claim 1, characterized in that, Both the conductor shielding layer and the insulating shielding layer are semi-conductive cross-linked polyolefin materials. The thickness of the conductor shielding layer is 0.8-1.2 mm, and the thickness of the insulating shielding layer is 0.6-1.0 mm.

5. The high-altitude weather-resistant, puncture-resistant, and corrosion-resistant power cable as described in claim 1, characterized in that, The braided shielding layer is made of tin-plated copper wire with a braiding density of ≥92%.

6. The high-altitude weather-resistant, puncture-resistant, and corrosion-resistant power cable as described in claim 1, characterized in that, The waterproof layer is a longitudinally wrapped aluminum-plastic composite strip with a longitudinal overlap rate of ≥25%, and the aluminum foil side is facing the woven shielding layer.

7. The high-altitude weather-resistant, puncture-resistant, and corrosion-resistant power cable as described in claim 1, characterized in that, The insulating inner lining is extruded from high-density polyethylene material and is used to isolate the high-strength armor layer from the woven shielding layer.

8. The high-altitude weather-resistant, puncture-resistant, and corrosion-resistant power cable as described in claim 1, characterized in that, The high-strength armor layer is made of hot-dip galvanized steel strip wrapped around the cable along the axial gap, and the width of the gap is no more than 50% of the width of the steel strip.

9. The high-altitude weather-resistant, puncture-resistant, and corrosion-resistant power cable as described in claim 1, characterized in that, The UV-resistant and corrosion-resistant outer sheath is made of modified polyolefin material, and by mass percentage, it contains 1-2% nano-titanium dioxide UV-resistant filler, 3-6% flake talc anti-corrosion filler, and 3-6% weather-resistant stabilizer.

10. A method for preparing a high-altitude weather-resistant, puncture-resistant, and corrosion-resistant power cable as described in any one of claims 1-9, characterized in that, Includes the following steps: Multiple strands of oxygen-free tin-plated copper wire are twisted together to obtain the conductor. The conductor shielding layer, the modified weather-resistant insulation layer, and the insulation shielding layer are extruded sequentially from the inside to the outside on the conductor to obtain the cable core. The braided shielding layer is woven on the outer surface of the cable core, and then the waterproof layer, the insulating inner lining layer, and the high-strength armor layer are sequentially wrapped longitudinally on the outer surface of the braided shielding layer. Finally, the UV-resistant and corrosion-resistant outer sheath is extruded to obtain the power cable.

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