Medium-voltage fire-resistant aluminum alloy core cable

Abstract

The utility model discloses a medium-voltage fire-resistant aluminum alloy core cable, which comprises a cable core and an outer sheath wrapped on the outer layer of the cable core, and the cable core comprises a plurality of wire cores and resistance wires; each wire core structurally comprises a conductor, a first wrapping tape, an inner shielding layer, an insulating layer, an outer shielding layer, a second wrapping tape and a metal shielding layer from inside to outside in sequence. The cable is reasonable in structural design, and has the following beneficial effects that the conductor adopts the second-type compressed molded line aluminum alloy conductor, the structure is compact, the outer diameter of the conductor is reduced, and the electrical cross section and the current-carrying capability of the cable are improved. And meanwhile, the resistance wires are arranged among the wire cores to form the cable together, so that the operation reliability, the safety and the convenience of maintenance and management of the medium-voltage fire-resistant cable can be remarkably improved, real-time temperature monitoring and rapid fault positioning are realized, the fire-resistant performance evaluation accuracy can be improved, and the safety can be enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a medium-voltage fire-resistant aluminum alloy core cable. Background Art

[0002] With the continuous growth of power demand in modern society, the importance of medium-voltage power transmission in fields such as industrial production, urban construction, and infrastructure has become increasingly prominent. However, traditional medium-voltage cables often cannot ensure the continuous and stable transmission of electricity in the face of sudden disasters such as fires, which brings huge potential risks and losses to production and life. At the same time, in application scenarios with high loads and frequently changing loads, such as large factories and commercial centers, the power demand is large and the load changes frequently, which easily leads to uneven heating or local overheating of the cables. Therefore, it is necessary to more accurately monitor the temperature changes to prevent overheating faults. In addition, in places with strict fire prevention requirements, such as high-rise buildings and underground facilities, the performance of fire-resistant cables during a fire is crucial, and it is also necessary to accurately evaluate the temperature changes of the cables during a fire to ensure that they meet the fire-resistant requirements. Moreover, in order to cope with the global energy crisis and environmental pressure, it has become an urgent task to find more efficient, economical, and environmentally friendly power transmission solutions. Content of the Utility Model

[0003] The purpose of the utility model is to provide a medium-voltage fire-resistant aluminum alloy core cable, which solves the problem that the temperature change of the cable during a fire cannot be accurately evaluated in the prior art.

[0004] In order to achieve the above purpose, the technical solution of the utility model provides a medium-voltage fire-resistant aluminum alloy core cable, which includes a cable core and an outer sheath wrapped around the outer layer of the cable core. The cable core includes a plurality of wire cores and resistance wires; the structure of the wire core from the inside to the outside is successively a conductor, a first tape, an inner shielding layer, an insulating layer, an outer shielding layer, a second tape, and a metal shielding layer.

[0005] Further, the structure of the outer sheath from the inside to the outside is successively a third tape, an oxygen isolation layer, an armor, a fire-resistant layer, a fireproof layer, an outer protection layer, and convex teeth.

[0006] Further, the cable core includes three wire cores and two resistance wires. The three wire cores are symmetrically arranged in a triangle, the resistance wires are arranged at the intervals between the wire cores, and fillers are arranged in the gaps in the cable core.

[0007] Further, the conductor is a Class 2 compacted aluminum alloy conductor, which is stranded by a plurality of aluminum alloy wires; the first tape is a layer of semi-conductive nylon tape; the inner shielding layer is a cross-linked semi-conductive shielding layer.

[0008] Further, the insulating layer is a cross-linked polyethylene insulating layer; the outer shielding layer is a peelable cross-linked semi-conductive outer shielding layer; the second tape is a semi-conductive buffer water-blocking tape.

[0009] Further, the metal shielding layer is a copper tape shielding layer, and the copper tape shielding layer is formed by winding a layer of copper tape around the outer layer of the second tape; the resistance wire is a thermistor wire; the filler is a rock wool rope.

[0010] Further, the third tape is a non-alkali glass fiber tape wound in an overlapping manner; the oxygen barrier layer is a high oxygen index low-smoke and halogen-free polyolefin oxygen barrier layer; the armor is a galvanized steel tape wound in a double-layered and spaced manner.

[0011] Further, the fire-resistant layer is a ceramifiable fire-resistant composite tape wound mechanically in an overlapping manner; the fire-proof layer is a layer of ceramifiable low-smoke and halogen-free polyolefin fire-proof layer; the outer protective layer is a high oxygen index halogen-free low-smoke flame-retardant thermoplastic polyolefin sheath.

[0012] Further, the convex teeth in the outer sheath structure protrude outwards with several teeth, and the distance between each tooth is the same. The cross-sectional shape of the tooth is a trapezoid that is narrow at the top and wide at the bottom.

[0013] Further, the cross-sectional shapes of the conductor and the cable core are circular.

[0014] In summary, the device structure of the present utility model is reasonably designed. By applying the technical solution of the present utility model, the following beneficial effects are achieved: The conductor adopts a Class 2 compacted aluminum alloy conductor, which has a compact structure, reduces the outer diameter of the conductor, improves the electrical cross-section and the current-carrying capacity of the cable. At the same time, the present utility model arranges a resistance wire between the cores during cabling, which can significantly improve the operation reliability, safety and maintenance management convenience of the medium-voltage fire-resistant cable. Specifically as follows: Real-time temperature monitoring: The thermistor wire can sense the temperature change inside the cable in real time. This helps to detect the overheating situation during the operation of the cable in a timely manner, give early warnings of potential faults, and ensure the safe operation of the cable. Quick fault location: When a fault occurs due to local overheating of the cable, by analyzing the temperature data fed back by the two thermistor wires, the location where the fault occurs can be determined more accurately, thereby shortening the time for fault troubleshooting and repair. Optimized operation management: The continuously monitored temperature data can provide an important basis for the operation management of the cable. For example, adjust the load of the cable according to the temperature change to avoid overloading operation and extend the service life of the cable. Improve the accuracy of fire-resistant performance evaluation: It helps to more accurately evaluate the performance of the cable under fire-resistant conditions and provides data support for further improving the fire-resistant design of the cable. Enhance safety: Detecting the overheating situation in a timely manner can take corresponding measures to reduce the risk of safety accidents such as fires and protect the safety of personnel and equipment. Description of the Drawings

[0015] Figure 1 It is a schematic cross-sectional structure diagram of the medium-voltage fire-resistant aluminum alloy core cable of the present utility model;

[0016] Explanation of the reference numerals in the drawings: 1 - conductor; 2 - first tape; 3 - inner shielding layer; 4 - insulating layer; 5 - outer shielding layer; 6 - second tape; 7 - metal shielding layer; 8 - resistance wire; 9 - filler; 10 - third tape; 11 - oxygen barrier layer; 12 - armor; 13 - fire-resistant layer; 14 - fireproof layer; 15 - outer protective layer; 16 - convex teeth. Specific embodiments

[0017] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model, but it does not constitute a limitation to the protection scope of the present utility model.

[0018] In the present utility model, for a clearer description, the following is stated: The observer faces the attached Figure 1 for observation. The front left side of the observer is set as the front, the rear right side of the observer is set as the rear, the left rear side of the observer is set as the left, the front right side of the observer is set as the right, the upper side of the observer is set as the upper, and the lower side of the observer is set as the lower. It should be noted that the terms "front end", "rear end", "left side", "right side", "middle part", "upper side", "lower side", etc. in the text indicate the orientation or position relationship based on the orientation or position relationship set by the drawings, and are only for the purpose of clearly describing the present utility model, rather than indicating or implying that the structures or components referred to must have a specific orientation and be constructed in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the terms "first", "second", "third", "fourth" are only used for the purpose of clear or simplified description, and cannot be understood as indicating or implying relative importance or quantity.

[0019] See Figure 1 , the present utility model provides a medium-voltage fire-resistant aluminum alloy core cable, which includes a cable core and an outer sheath wrapped around the outer layer of the cable core. The cable core includes a plurality of wire cores and a resistance wire 8; the structure of the wire core from the inside to the outside is successively a conductor 1, a first tape 2, an inner shielding layer 3, an insulating layer 4, an outer shielding layer 5, a second tape 6, and a metal shielding layer 7.

[0020] Specifically, the structure of the outer sheath from the inside to the outside is successively a third tape 10, an oxygen barrier layer 11, an armor 12, a fire-resistant layer 13, a fireproof layer 14, an outer protective layer 15, and a convex tooth 16.

[0021] As a preferred embodiment of the present utility model, the cable core includes three wire cores and two resistance wires 8. The three wire cores are symmetrically arranged in a triangle, and the resistance wires 8 are arranged at the intervals between the wire cores. Fillers 9 are arranged in the gaps in the cable core.

[0022] As a preferred embodiment of the present utility model, the conductor 1 is a Class 2 compacted stranded aluminum alloy conductor, which is stranded by multiple aluminum alloy wires; the first tape 2 is a layer of semi-conductive nylon tape; the inner shielding layer 3 is a cross-linked semi-conductive shielding layer. Specifically, the insulating layer 4 is a cross-linked polyethylene insulating layer; the outer shielding layer 5 is a peelable cross-linked semi-conductive outer shielding layer; the second tape 6 is a semi-conductive buffer water-blocking tape. Specifically, the metal shielding layer 7 is a copper tape shielding, and one layer of copper tape is wound around the outer layer of the second tape 6; the resistance wire 8 is a thermistor wire; the filler 9 is a rock wool rope.

[0023] The conductor 1 adopts a Class 2 compacted stranded aluminum alloy conductor, which is stranded by multiple aluminum alloy wires. The electrical and mechanical properties of the aluminum alloy conductor are far higher than those of the traditional stranded aluminum conductor, and the structure is compact, which is more conducive to reducing the outer diameter of the conductor 1, increasing the electrical cross-section while reducing the material consumption of the conductor 1, and further improving the current-carrying capacity of the cable. Aluminum alloy has the advantages of good electrical conductivity, light weight, and relatively low cost. Applying it to the cable core can, to a certain extent, reduce the weight of the cable, lower the installation and transportation costs, and is also beneficial to improving the power transmission capacity of the line.

[0024] The first tape 2 is a semi-conductive nylon tape. A layer of semi-conductive nylon tape is wound around the surface of the conductor 1 as a shielding layer. It is equipotential with the shielded conductor 1 and has good contact with the insulating layer 4, thus avoiding partial discharge between the conductor 1 and the insulating layer 4.

[0025] The inner shielding layer 3 is a cross-linked semi-conductive shielding layer. The conductor 1 shielding uses a cross-linked semi-conductive shielding material and is tightly coated inside the insulating layer 4 through a three-layer co-extrusion technology. It forms equipotential with the cable conductor 1 and the metal shielding layer 7 respectively, creating a smooth interface between the insulation and the high-voltage potential and the ground potential, which can eliminate burrs or protrusions on the surface of the metal conductor 1, evenly distribute the interface electric field, suppress the excessive local field strength, and prevent partial discharge, so as to improve the electrical strength of the cable and extend the service life of the cable.

[0026] The insulating layer 4 uses a cross-linked polyethylene insulating material. By using the peroxide cross-linking method, the polyethylene molecules change from a linear molecular structure to a three-dimensional network structure, changing from a thermoplastic material to a thermosetting material, significantly improving the current-carrying capacity of the cable. The insulating material has heat resistance, insulation performance, mechanical performance, chemical resistance, etc.

[0027] The outer shielding layer 5 adopts a peelable cross-linked semi-conductive outer shielding, which is tightly coated outside the insulating layer 4 through a three-layer co-extrusion technology. It has good contact with the shielded insulating layer 4 and forms equipotential with the metal shielding layer 7, thus avoiding partial discharge between the insulating layer 4 and the sheath.

[0028] The second wrapping tape 6 is a semiconductive buffer water-blocking tape, which is arranged between the cable outer shielding layer 5 and the metal shielding layer 7. It plays a role in protecting the insulation shield. At the same time, when the cable catches fire, it can act as a barrier, separating the conductor 1 from the copper tape to avoid breakdown. It also plays an electrical connection role, reducing the enrichment of surface charges on the insulation shield and the possibility of partial discharge. It has good electrical conductivity and optical properties. Its main chemical properties include reactivity such as oxidation, grafting, and sulfonation, as well as catalytic action, free radical elimination action, and anti-aging action, etc.

[0029] The metal shielding layer 7 is a copper tape shielding layer. A layer of copper tape is wound to shield the metal, preventing axial surface discharge. It has excellent lightning protection characteristics. When there is a short circuit, the metal tape can serve as a loop for the short-circuit fault current.

[0030] The resistance wire 8 is a thermistor wire. Two thermistor wires are arranged between the cores. Adding two thermistor wires can significantly improve the operation reliability, safety, and convenience of maintenance management of the medium-voltage fire-resistant cable.

[0031] The filler 9 is a rock wool rope. When cabling, the rock wool rope is used for filling. Based on the roundness of the cable core, it has the functions of flame retardancy, support, rounding, tensile strength and anti-torsion, and buffer protection.

[0032] Having the flame retardancy function: The rock wool rope itself has certain flame retardant properties, which can, to a certain extent, prevent the spread of fire and improve the fire safety of the cable.

[0033] Having the support and rounding function: The rock wool rope can play a role in supporting the inner protective layer, keeping the overall cable in a circular or quasi-circular structure, and ensuring the stability of the appearance and internal structure of the cable.

[0034] Having the tensile strength and anti-torsion function: It can improve the tensile strength and anti-torsion ability of the cable, reducing the deformation and damage of the cable when it is stretched or twisted during use.

[0035] Having the buffer protection function: It provides buffering for the internal structure of the cable, reducing the direct impact of external mechanical stress on the cable.

[0036] Specifically, the third wrapping tape 10 is a non-alkali glass fiber tape wound in an overlapping manner; the oxygen barrier layer 11 is a high oxygen index low-smoke and halogen-free polyolefin oxygen barrier layer; the armor 12 is a galvanized steel tape wound in a double-layer and spaced manner. Specifically, the fire-resistant layer 13 is a ceramifiable fire-resistant composite tape wound mechanically in an overlapping manner; the fire protection layer 14 is a layer of ceramifiable low-smoke and halogen-free polyolefin fire protection layer; the outer protection layer 15 is a high oxygen index halogen-free low-smoke flame retardant thermoplastic polyolefin sheath. Specifically, the convex teeth 16 in the outer sheath structure protrude outward, the distance between each tooth is the same, and the cross-sectional shape of the tooth is a trapezoid that is narrow at the top and wide at the bottom.

[0037] The third wrapping tape 10 is made of overlapping alkali-free glass fiber tapes, and metal hydrate components are added to the material. The material used for the high-toughness flame-retardant fire insulation layer is a tape that combines flame retardancy, heat absorption and oxygen insulation, which achieves high flame retardancy of the flame-retardant cable and can effectively improve the thermal insulation and flame retardant properties of the cable.

[0038] The oxygen barrier layer 11 is made of a high-oxygen-index, low-smoke, halogen-free polyolefin material. This sheath material exhibits excellent flame retardancy, preventing it from melting and dripping in flames, instead forming a carbonized layer that effectively prevents the spread of fire. During combustion, this sheath material produces minimal smoke and does not release halogenated acid gases.

[0039] Armor 12 utilizes a double-layer, gap-wound galvanized steel tape, which increases the cable's mechanical strength, corrosion resistance, tensile strength, and compressive strength. This mechanical protection extends the cable's service life. It also effectively protects the cable's structural integrity and electrical performance, extending its service life. It also protects the cable from external mechanical forces and damage, as well as rats and termites, preventing them from penetrating the armor and causing power transmission problems. The armor also has a large bending radius.

[0040] The fire-resistant layer 13 is mechanically wrapped with overlapping ceramic fire-resistant composite tape. Under normal conditions, the ceramic fire-resistant composite tape exhibits excellent flexibility and elasticity, resulting in excellent performance and resistance to breakage. When wrapping the tape on the armored equipment, attention should be paid to the material characteristics, and the tape tension and wrapping angle should be appropriately adjusted to ensure a smooth and snug fit around the cable core. This special silicone rubber-wrapped refractory material is a composite of ceramic fire-resistant silicone rubber and high-temperature alkali-free fiberglass cloth. Under fire conditions (600°C to 3000°C), it rapidly burns into a complete, hard, ceramic-like shell. The longer the burning time and the higher the temperature, the harder the shell. This rigid shell provides excellent protection for the line, ensuring smooth operation in the event of a fire.

[0041] The fireproof layer 14 is made of an extruded layer of ceramic low-smoke halogen-free polyolefin refractory material. The ceramic low-smoke halogen-free polyolefin refractory material is a high-performance refractory material developed on the basis of ceramic fireproof and fire-resistant silicone rubber. It can be used with an ordinary extruder for processing low-smoke halogen-free materials. A hard ceramic shell will be generated under flame burning or high temperature conditions. The shell does not melt or drip, is resistant to water spray and mechanical vibration, and has very good heat insulation and fireproofing effects. It can ensure the smooth flow of power and information control in the event of a fire, and buy precious time for personnel escape and fire rescue.

[0042] The outer protective layer 15 is made of a halogen-free low-smoke flame-retardant thermoplastic polyolefin sheath material with a high oxygen index. It not only has good flame-retardant and fire-resistant characteristics but also does not produce toxic gases under fire conditions. Moreover, technical indicators such as pH value, heavy metal content, smoke density, and light transmittance are all superior to the requirements of relevant national standards. And a large amount of inorganic flame retardants are filled in this material. When they decompose at high temperatures, they will decompose into water vapor, absorb the heat on the surface of the cable, and also reduce the surface temperature of the cable.

[0043] Convex teeth 16 are evenly distributed around the outer protective layer 15. There are multiple convex teeth 16, which are serrated, so that the cable will not be laid close to the surface of an object, increasing the contact area between the cable and the air, ensuring ventilation around the cable, improving the current-carrying capacity of the cable, and extending the service life of the cable.

[0044] Specifically, the cross-sectional shapes of the conductor core and the cable core are circular.

[0045] Aluminum alloy is a material with good electrical conductivity and relatively low cost. Therefore, the present utility model provides a medium-voltage fire-resistant aluminum alloy core cable, whose conductor core is an aluminum alloy core, aiming to combine the advantages of aluminum alloy with fire-resistant performance to meet the increasingly strict power safety standards and the requirements of sustainable development. This kind of cable can not only efficiently transmit medium-voltage power under normal operating conditions but also still maintain normal operation for a certain period of time in extreme situations such as fires, providing power guarantee for emergency handling and the operation of key equipment, thereby minimizing the losses caused by disasters and ensuring the reliability and stability of the power system. At the same time, it can monitor the internal temperature of the cable in real time, and corresponding measures can be taken in time when overheating is detected, reducing the risk of safety accidents such as fires and protecting the safety of personnel and equipment.

[0046] The beneficial effects are as follows:

[0047] In the present utility model, two thermistor wires are added between the line cores during cabling, which can significantly improve the operation reliability, safety, and convenience of maintenance management of medium-voltage fire-resistant cables. It has real-time temperature monitoring: the thermistor wires can sense the temperature changes inside the cable in real time. This helps to timely detect overheating during the operation of the cable, give early warnings of potential faults, and ensure the safe operation of the cable. It has rapid fault location: when a fault occurs due to local overheating of the cable, by analyzing the temperature data fed back by the two thermistor wires, the location where the fault occurs can be determined more accurately, thus shortening the time for fault troubleshooting and repair. It optimizes operation management: the continuously monitored temperature data can provide important basis for the operation management of the cable. For example, adjusting the load of the cable according to the temperature change to avoid overloading and extend the service life of the cable. It improves the accuracy of fire-resistant performance evaluation: helps to more accurately evaluate the performance of the cable under fire-resistant conditions and provides data support for further improving the fire-resistant design of the cable. It enhances safety: taking corresponding measures in time when overheating is detected can reduce the risk of safety accidents such as fires and protect the safety of personnel and equipment.

[0048] An oxygen isolation layer is provided outside the cabled core, and at the same time, a fire-resistant layer and a fireproof layer are provided outside the armor layer. They respectively adopt a composite structure composed of a high oxygen index low-smoke halogen-free polyolefin oxygen isolation layer material, a ceramized fire-resistant composite tape, and a ceramized low-smoke halogen-free polyolefin fire-resistant material. The outer protective layer adopts a high oxygen index halogen-free low-smoke flame-retardant polyolefin material, and convex teeth are evenly distributed around it, presenting a serrated shape. It will not cause the cable to be laid closely against an object, ensuring ventilation around the cable, improving the current-carrying capacity of the cable, and extending the service life of the cable. It can ensure the safety and reliability of the power system to a greater extent, ensure the smoothness of power and information control in case of fire, and gain precious time for personnel evacuation and fire fighting and rescue.

[0049] The advantages are as follows:

[0050] 1. Improve the safety of the power system: It can still maintain normal power transmission for a certain period of time in case of emergencies such as fires, providing key power support for personnel evacuation, operation of fire-fighting facilities, etc., and reducing the losses and risks caused by fires.

[0051] 2. Performance advantages of aluminum alloy materials: Aluminum alloy has advantages such as good electrical conductivity, light weight, and relatively low cost. Applying it to the cable core can, to a certain extent, reduce the weight of the cable, lower the installation and transportation costs, and is also beneficial to improving the power transmission capacity of the line. And the cost of aluminum alloy materials is relatively low, which helps to reduce the overall cost of the cable while ensuring performance.

[0052] 3. Demands for Energy Efficiency and Sustainable Development: Against the backdrop of global energy shortages and heightened environmental awareness, finding more energy-efficient, high-performance, and sustainable power transmission solutions has become an urgent priority. The utility model of a medium-voltage fire-resistant aluminum alloy core cable helps improve energy transmission efficiency, reduce energy losses, and meet the strategic requirements of sustainable development.

[0053] 4. Enhancing Power System Safety: It can maintain normal power transmission for a certain period of time during emergencies such as fires, providing crucial power support for personnel evacuation, operation of fire-fighting facilities, etc., and reducing losses and risks caused by fires.

[0054] 5. Reducing Weight: Compared with traditional copper core cables, aluminum alloy core cables are lighter in weight, making them easier to transport and install, and reducing construction difficulty and costs.

[0055] 6. Good Electrical Conductivity: It can effectively transmit electricity, reduce power losses during transmission, and improve energy utilization efficiency.

[0056] 7. Cost-Effectiveness: The cost of aluminum alloy materials is relatively low. While ensuring performance, it helps reduce the overall cost of the cable.

[0057] 8. Corrosion Resistance: It has good corrosion resistance, can adapt to different environmental conditions, and extend the service life of the cable.

[0058] 9. Energy Conservation and Environmental Protection: The impact on the environment during production and use is relatively small, meeting the requirements of sustainable development.

[0059] 10. Increasing Wiring Flexibility: Due to its light weight and good flexibility, it is more flexible during wiring and can adapt to complex wiring environments.

[0060] 11. Improving System Stability: The reliable fire-resistant performance helps maintain the stable operation of the power system, reducing problems such as power outages and production interruptions caused by faults.

[0061] The above are the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements are also regarded as within the protection scope of the present utility model.

Claims

1. A medium-voltage fire-resistant aluminum alloy core cable, comprising a cable core and an outer sheath wrapped around the outer layer of the cable core, characterized in that: The cable core includes a plurality of wire cores and resistance wires; the structure of the wire core from the inside to the outside is successively a conductor, a first tape, an inner shielding layer, an insulating layer, an outer shielding layer, a second tape, and a metal shielding layer; the conductor is a Class 2 compacted aluminum alloy conductor, which is stranded by a plurality of aluminum alloy wires.

2. The medium-voltage fire-resistant aluminum alloy core cable according to claim 1, characterized in that: The structure of the outer sheath from the inside to the outside is successively a third tape, an oxygen barrier layer, an armor, a fire-resistant layer, a fireproof layer, an outer protective layer, and convex teeth.

3. The medium-voltage fire-resistant aluminum alloy core cable according to claim 2, characterized in that: The cable core includes three wire cores and two resistance wires. The three wire cores are symmetrically arranged in a triangle. The resistance wires are arranged at the intervals between the wire cores. Fillers are arranged in the gaps in the cable core.

4. The medium-voltage fire-resistant aluminum alloy core cable according to claim 3, characterized in that: The first tape is a layer of semi-conductive nylon tape; the inner shielding layer is a cross-linked semi-conductive shielding layer.

5. The medium-voltage fire-resistant aluminum alloy core cable according to claim 4, wherein: The insulating layer is a cross-linked polyethylene insulating layer; the outer shielding layer is a peelable cross-linked semi-conductive outer shielding layer; the second tape is a semi-conductive buffer water-blocking tape.

6. The medium-voltage fire-resistant aluminum alloy core cable according to claim 3 or 4 or 5, characterized in that: The metal shielding layer is a copper tape shielding layer, and the copper tape shielding layer is a layer of copper tape wound around the outer layer of the second tape; the resistance wire is a thermistor wire; the filler is a rock wool rope.

7. A medium-voltage fire-resistant aluminum alloy core cable according to any one of claims 2-5, characterized in that: The third tape is a non-alkali glass fiber tape wound in an overlapping manner; the oxygen barrier layer is a high oxygen index low smoke and halogen-free polyolefin oxygen barrier layer; the armor is a double-layer gap-wound galvanized steel tape.

8. A medium-voltage fire-resistant aluminum alloy core cable according to any one of claims 2-5, characterized in that: The fire-resistant layer is a ceramifiable fire-resistant composite tape wound mechanically in an overlapping manner; the fireproof layer is a layer of ceramifiable low smoke and halogen-free polyolefin fireproof layer; the outer protective layer is a high oxygen index halogen-free low smoke flame-retardant thermoplastic polyolefin sheath.

9. A medium-voltage fire-resistant aluminum alloy core cable according to any one of claims 2-5, characterized in that: The convex teeth in the structure of the outer sheath protrude outwards. The distance between each tooth is the same. The cross-sectional shape of the tooth is a trapezoid that is narrow at the top and wide at the bottom.

10. A medium-voltage fire-resistant aluminum alloy core cable according to any one of claims 1-5, characterized in that: The cross-sectional shapes of the wire core and the cable core are circular.

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