Rat-proof and ant-proof power cable of 35 kV and below

Abstract

The utility model discloses an anti-rat and anti-termite power cable of 35 kV and below, which comprises a cable core and an outer sheath wrapping the cable core, the cable core comprises a wire core and a filler, and the structure of the wire core is sequentially provided with an aluminum alloy conductor, a first shielding layer, an insulating layer, an insulating shielding layer and a second shielding layer from inside to outside; the outer sheath comprises a rat-and-ant-proof sheath. And the insulating layer is a 35KV cross-linked polyethylene insulating layer. The aluminum alloy cable is reasonable in structural design, and has the following beneficial effects that the aluminum alloy conductors are adopted, so that the aluminum alloy cable not only has great advantage in price, but also is light in weight, the building structure is lightened, the installation and transportation costs are reduced, and the total construction cost of a project is further reduced; meanwhile, the outer sheath is provided with the double-layer anti-rat and anti-termite sheath, the anti-rat and anti-termite function can be achieved in the service life of the cable, gnawing is effectively prevented, the first shielding layer, the insulation shielding layer and the second shielding layer are arranged, the good shielding function is achieved, and the application prospect is wide.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a rat and ant-proof 35kV and below power cable. Background Art

[0002] As the largest supporting industry in the national economy, the wire and cable manufacturing industry is the foundation of all industries, including basic ones. Its products are widely used in fundamental industries such as energy, transportation, communications, automotive, and petrochemicals. Its development is influenced by international and domestic macroeconomic conditions, national economic and industrial policies, and the dynamics of related industries, and is closely linked to the development of the national economy. Wire and cable products must meet the new requirements for technical performance and cost-effectiveness in various application areas, as well as meet the ever-increasing demands of the people's living standards. Therefore, its development must stay ahead of the development of its application areas.

[0003] Aluminum alloy cables are power cables made from an alloy formed by adding iron, rare earth elements, and other elements to aluminum and then annealing it. They have been successfully used in North America for over 30 years and are an advanced, mature technology and product. Compared to traditional copper cables, aluminum alloy power cables achieve the same safety and electrical performance as copper cables, and their installation performance is superior to copper. They also offer significant price advantages. Their lighter weight reduces building structures, installation, and transportation costs, lowering overall project costs and aligning with the spirit of building a conservation-oriented society. As my country's urbanization and urban and rural power grid transformation accelerate, copper resources are gradually depleting, and demand for cables continues to increase. The use of new aluminum alloy power cables can save significant construction funds annually, positively impacting the creation of a conservation-oriented society and the nation. Utility Model Content

[0004] The purpose of the utility model is to provide a 35kV and below power cable that is rat-proof and ant-proof, which can save a lot of construction funds and effectively prevent the gnawing of rats and ants.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the present utility model provides a 35kV and below rat- and ant-proof power cable, including a cable core and an outer sheath wrapping the cable core, the cable core including a plurality of wire cores and fillers filling the gaps between the plurality of wire cores, the structure of the wire core being sequentially provided with a conductor, a first shielding layer, an insulating layer, an insulating shielding layer, and a second shielding layer from the inside to the outside; the outer sheath includes a rat- and ant-proof sheath; the insulating layer is a 35KV cross-linked polyethylene insulation layer.

[0006] Furthermore, the outer sheath includes two layers of rat and ant proof sheaths, and the structure of the outer sheath is sequentially provided with an isolation sleeve, armor, an oxygen isolation layer, a flame retardant layer, a first rat and ant proof sheath, and a second rat and ant proof sheath from the inside to the outside.

[0007] Furthermore, the number of the wire cores is 3, and the 3 wire cores and the gaps between the wire cores are filled with fillers and then wrapped with fireproof tapes. This structure constitutes a cable core, and the cross-section of the cable core is circular.

[0008] Furthermore, the fireproof tape is a ceramic fireproof and fire-resistant composite tape.

[0009] Furthermore, the conductor is a compressed conductor formed by twisting Class 2 aluminum alloy wires, the first shielding layer is a cross-linked semi-conductive shielding layer, the insulating shielding layer is a strippable cross-linked semi-conductive outer shielding layer, and the second shielding layer is a copper tape.

[0010] Furthermore, the first shielding layer, the insulating layer, and the insulating shielding layer are a three-layer co-extruded structure.

[0011] Furthermore, the filler is a high-temperature filling rope.

[0012] Furthermore, the isolation sleeve is a halogen-free, low-smoke, flame-retardant thermoplastic polyolefin sheath, the armor is a steel belt armor, the oxygen insulation layer is a ceramicized polyolefin flame-retardant and fire-resistant oxygen insulation layer, and the flame retardant layer is a low-smoke, halogen-free, highly flame-retardant tape.

[0013] Furthermore, the armor is armor with double layers of gap wrapped around galvanized steel strips.

[0014] Furthermore, the first rat and ant proof sheath is a halogen-free, low-smoke, flame-retardant thermoplastic polyolefin sheath, and the second rat and ant proof sheath is a nylon 12 sheath.

[0015] To sum up, the device structure of the present invention is reasonably designed, and the use of the technical solution of the present invention has the following beneficial effects: the present invention adopts an aluminum alloy conductor, which not only has a great advantage in price, but also has a light weight, which reduces the building structure, reduces the installation and transportation costs, and thus reduces the overall project cost; at the same time, the outer sheath is provided with a double-layer anti-rat and ant sheath, which can play a rat and ant prevention function throughout the life cycle of the cable, effectively preventing gnawing, and is provided with a first shielding layer, an insulating shielding layer, and a second shielding layer, has good shielding function, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the cross-sectional structure of the utility model's rat and ant-proof 35kV and below power cable;

[0017] Explanation of the reference numerals: 1-conductor; 2-first shielding layer; 3-insulating layer; 4-insulating shielding layer; 5-second shielding layer; 6-filler; 7-fireproof tape; 8-isolating sleeve; 9-armour; 10-oxygen insulation layer; 11-flame retardant layer; 12-first rat-proof and ant-proof sheath; 13-second rat-proof and ant-proof sheath. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention, but this does not constitute a limitation on the protection scope of the present invention.

[0019] In this utility model, for a clearer description, the following explanation is made: the observer faces the Figure 1 For observation, the left front side of the observer is set as front, the right rear side of the observer is set as rear, the left rear side of the observer is set as left, the right front side of the observer is set as right, the top of the observer is set as top, and the bottom of the observer is set as bottom. It should be noted that the terms "front end", "rear end", "left side", "right side", "middle", "top", "bottom" and so on in the text indicate the direction or position relationship based on the direction or position relationship set in the drawings, which is only for the convenience of clearly describing the present invention, and does not indicate or imply that the structure or component referred to must have a specific direction or be constructed in a specific direction. Therefore, it cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", and "fourth" are only used for the purpose of clarifying or simplifying the description, and cannot be understood as indicating or implying relative importance or quantity.

[0020] See also Figure 1 The utility model provides a rat- and ant-proof 35kV and below power cable, comprising a cable core and an outer sheath wrapped around the cable core, the cable core comprising a plurality of wire cores and a filler 6 filling gaps between the wire cores, the structure of the wire core being sequentially provided with a conductor 1, a first shielding layer 2, an insulating layer 3, an insulating shielding layer 4, and a second shielding layer 5 from the inside out; the outer sheath comprises a rat- and ant-proof sheath; the insulating layer 3 is a 35kV cross-linked polyethylene insulation layer.

[0021] Insulation layer 3 utilizes 35kV cross-linked polyethylene insulation. This insulation utilizes peroxide cross-linking, transforming the polyethylene molecules from a linear structure to a three-dimensional network, transforming them from thermoplastic to thermosetting, significantly improving the cable's current-carrying capacity. This insulation exhibits excellent heat resistance, insulation properties, mechanical properties, and chemical resistance.

[0022] As a preferred embodiment of the present invention, the outer sheath includes two layers of rat-proof and ant-proof sheaths. The structure of the outer sheath is sequentially provided with an isolation sleeve 8, an armor 9, an oxygen isolation layer 10, a flame retardant layer 11, a first rat-proof and ant-proof sheath 12, and a second rat-proof and ant-proof sheath 13 from the inside to the outside.

[0023] As a preferred embodiment of the present invention, the number of wire cores is 3, and the 3 wire cores and the gaps between the wire cores are filled with filler 6 and then wrapped with fireproof tape 7. This structure constitutes a cable core, and the cross-section of the cable core is circular; the fireproof tape 7 is a ceramic fireproof and fire-resistant composite tape.

[0024] When making cables, ceramic fire-proof and fire-resistant composite tape is used for wrapping. The ceramic fire-proof and fire-resistant composite tape will be quickly burned into a ceramic-like hard and complete shell at a temperature of 590℃~2950℃. The hard shell armor after burning can provide good protection for the line and ensure the smooth flow of the line in the event of fire.

[0025] Specifically, conductor 1 is a compressed conductor made of twisted Class 2 aluminum alloy wires, the first shielding layer 2 is a cross-linked semi-conductive shielding layer, the insulating shielding layer 4 is a strippable cross-linked semi-conductive outer shielding layer, and the second shielding layer 5 is a copper tape; the first shielding layer 2, the insulating layer 3, and the insulating shielding layer 4 are a three-layer co-extrusion structure.

[0026] Conductor 1 is a Class 2 aluminum alloy compressed conductor, which is made of multiple strands of aluminum alloy wire twisted together. The electrical and mechanical properties of the aluminum alloy conductor are much higher than those of traditional twisted aluminum conductors, and can effectively reduce the aging of the internal insulation of the cable.

[0027] The first shielding layer 2 is made of a cross-linked semi-conductive shielding material and is tightly wrapped within the insulating layer 3 through a three-layer co-extrusion process. It forms an equipotential with the cable conductor 1 and the second shielding layer 5, respectively, and creates a smooth interface between the insulation, the high voltage potential, and the ground potential. This eliminates burrs or protrusions on the metal conductor surface, evens out the interfacial electric field distribution, suppresses excessive local field strength, and prevents partial discharge, thereby improving the electrical strength and service life of the cable.

[0028] The insulating shielding layer 4 is made of a removable, cross-linked, semi-conductive shielding material and is tightly wrapped around the insulating layer 3 using a three-layer co-extrusion process. It maintains good contact with the shielded insulating layer 3 and forms an equipotential with the second shielding layer 5, thus preventing partial discharge between the insulating layer 3 and the rat- and ant-proof sheath.

[0029] The second shielding layer 5 is wrapped with a layer of copper tape as a metal shield to prevent axial surface discharge and has excellent lightning protection characteristics. In the event of a short circuit, the metal tape can serve as a loop for the short-circuit fault current.

[0030] Specifically, the filler 6 is a high-temperature filling rope; the isolation sleeve 8 is a halogen-free, low-smoke, flame-retardant thermoplastic polyolefin sheath, the armor 9 is a double-layer gap-wrapped armor of galvanized steel strips, the oxygen insulation layer 10 is a ceramicized polyolefin flame-retardant and fire-resistant oxygen insulation layer, and the flame retardant layer 11 is a low-smoke, halogen-free, highly flame-retardant tape.

[0031] The filler 6 is made of high temperature filling rope, which has excellent electrical properties and anti-aging properties. It also has long service life, high strength, and high temperature resistance.

[0032] The isolation sleeve 8 is made of halogen-free, low-smoke, flame-retardant thermoplastic polyolefin sheath material, which effectively protects the cable core from being damaged by the armor 9 metal.

[0033] The armor 9 is wrapped with double layers of galvanized steel tape, which increases the mechanical strength of the cable, improves the corrosion resistance, increases the tensile strength and compressive strength, and the mechanical protection extends the service life.

[0034] The oxygen-isolating layer 10 is made of ceramicized polyolefin flame-retardant and fire-resistant oxygen-isolating material, which can form honeycomb-shaped fine pores during the sintering process, and can play a good role in fire isolation, heat insulation and temperature insulation.

[0035] The flame retardant layer 11 is made of low-smoke halogen-free high flame retardant tape, which effectively plays a flame retardant role.

[0036] Specifically, the first rat-proof and ant-proof sheath 12 is a halogen-free, low-smoke, flame-retardant thermoplastic polyolefin sheath, and the second rat-proof and ant-proof sheath 13 is a nylon 12 sheath.

[0037] The first rat-proof and ant-proof sheath 12 is made of halogen-free, low-smoke, flame-retardant thermoplastic polyolefin sheath material, which has excellent flame-retardant effect, good self-extinguishing property, low smoke emission, low toxicity, and rat-proof and ant-proof performance.

[0038] The second anti-rat and ant sheath 13 is made of nylon 12 sheath. The nylon sheath made of nylon material has high hardness and makes the cable have good oil resistance, wear resistance, fire resistance, cold resistance, high temperature resistance and anti-rat and ant performance.

[0039] The utility model is a rat- and ant-proof power cable, comprising a cable core formed by twisting three main insulated power cores. The main insulated power cores are wrapped with copper tape, the gaps between the cable cores are filled with a filler material, the cable core is wrapped with a ceramic fire-resistant composite tape, the ceramic fire-resistant composite tape is extruded with an isolation sleeve 8, the isolation sleeve 8 is wrapped with a steel tape, the steel tape is extruded with an oxygen barrier layer 10, the oxygen barrier layer 10 is wrapped with a flame-retardant tape, the flame-retardant tape is extruded with a first rat- and ant-proof sheath 12, and the first rat- and ant-proof sheath 12 is extruded with a second rat- and ant-proof sheath 13. The second rat- and ant-proof sheath 13 is made of nylon. The nylon sheath, steel tape, copper tape, and first rat- and ant-proof sheath 12 ensure that the cable truly functions as a rat- and ant-proof cable throughout its life cycle, effectively preventing termite attack while also providing the cable with a good shielding function. The cable has broad application prospects.

[0040] 1. Improved mechanical properties

[0041] The mechanical properties of aluminum alloy cables are significantly improved compared to pure aluminum cables. The tensile strength and elongation of aluminum alloy conductors are both increased, making the cables safer and more reliable during use. Furthermore, the bending properties of aluminum alloy cables are improved, with a bend radius much smaller than that of copper cables, making installation more convenient.

[0042] 2. Enhanced corrosion resistance

[0043] Aluminum alloy cables are more corrosion-resistant than pure aluminum cables. This is because chemical elements such as rare earth elements are added to aluminum alloys. These elements can improve the corrosion resistance of aluminum alloys, especially their resistance to electrochemical corrosion. This is very important for cables used in harsh environments.

[0044] 3. Improvement of deadweight bearing capacity

[0045] Aluminum alloy cables can withstand greater weight, which means that at the same current carrying capacity, the weight of aluminum alloy cables is only about half that of copper cables. This not only reduces installation costs, but also reduces wear and tear on equipment and cables, making installation work easier.

[0046] 4. Optimization of economic performance

[0047] From an economic perspective, aluminum alloy cables offer certain advantages. Although their electrical conductivity is inferior to that of copper cables, their procurement costs can be 35% to 40% lower than copper cables, while achieving equivalent electrical performance. Installation costs can also be reduced by approximately 20%. This makes aluminum alloy cables a more economical choice for budget-constrained installations.

[0048] 5. Improvement of creep resistance

[0049] The creep resistance of aluminum alloy cables has been significantly improved. Compared with pure aluminum, the creep resistance of aluminum alloy conductors has been improved by 300%, which helps to avoid relaxation problems caused by cold flow or creep, thereby improving the stability of cable connections.

[0050] 6. Improvement in flexibility

[0051] Aluminum alloy cables are more flexible, 30% more flexible than copper and 40% less resilient than copper. This makes it easier to connect terminals during installation, reducing installation difficulty and the risk of failure.

[0052] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A rat and ant-proof power cable of 35 kV or less, comprising a cable core and an outer sheath surrounding the cable core, characterized in that: The cable core includes a plurality of cores and fillers filling the gaps between the cores. The structure of the core is sequentially provided with a conductor, a first shielding layer, an insulating layer, an insulating shielding layer, and a second shielding layer from the inside out. The outer sheath includes a rat-proof and ant-proof sheath. The conductor is an aluminum alloy conductor, and the insulating layer is a 35KV cross-linked polyethylene insulation layer. The outer sheath comprises two layers of rat-proof and ant-proof sheaths, and the structure of the outer sheath is sequentially provided with an isolation sleeve, an armor, an oxygen isolation layer, a flame retardant layer, a first rat-proof and ant-proof sheath, and a second rat-proof and ant-proof sheath from the inside to the outside; The number of the cores is 3, and the 3 cores and the gaps between the cores are filled with fillers and then wrapped with fireproof tape. This structure constitutes a cable core, and the cross section of the cable core is circular; The fireproof tape is a ceramic fireproof and fire-resistant composite tape.

2. The rat- and ant-proof 35kV and below power cable according to claim 1, characterized in that: The conductor is a compressed conductor formed by twisting Class 2 aluminum alloy wires, the first shielding layer is a cross-linked semi-conductive shielding layer, the insulating shielding layer is a strippable cross-linked semi-conductive outer shielding layer, and the second shielding layer is a copper tape.

3. The rat- and ant-proof 35kV and below power cable according to claim 2, characterized in that: The first shielding layer, the insulating layer and the insulating shielding layer are a three-layer co-extrusion structure.

4. The rat- and ant-proof 35 kV and below power cable according to claim 1, characterized in that: The filler is a high-temperature filling rope.

5. The rat- and ant-proof 35 kV and below power cable according to claim 1, characterized in that: The isolation sleeve is a halogen-free, low-smoke, flame-retardant thermoplastic polyolefin sheath, the armor is a steel belt armor, the oxygen barrier layer is a ceramicized polyolefin flame-retardant and fire-resistant oxygen barrier layer, and the flame retardant layer is a low-smoke, halogen-free, highly flame-retardant tape.

6. The rat- and ant-proof power cable of 35 kV and below according to claim 5, characterized in that: The armor is a double-layer armor with gaps wrapped around galvanized steel strips.

7. The rat- and ant-proof 35 kV and below power cable according to claim 1, characterized in that: The first rat-proof and ant-proof sheath is a halogen-free, low-smoke, flame-retardant thermoplastic polyolefin sheath, and the second rat-proof and ant-proof sheath is a nylon 12 sheath.

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