High efficient insulation corrosion-resistant overhead cable

Abstract

This utility model discloses a high-efficiency insulated and corrosion-resistant overhead cable. The cable has high overall strength, achieves high-efficiency insulation, and has good corrosion resistance. It includes an inner sheath and an outer sheath. The inner sheath contains a conductor, and an inner shielding layer and an insulation layer are sequentially arranged outside the conductor. The insulation layer includes an inner layer, a middle layer, and an outer layer sequentially arranged outside the inner shielding layer. Between the inner and outer sheaths, a semi-conductive layer, an outer shielding layer, and a waterproof layer are sequentially arranged from the inside out. The outer sheath includes an anti-corrosion layer and an anti-aging layer sequentially arranged outside the waterproof layer.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to a high-efficiency insulated and corrosion-resistant overhead cable. Background Technology

[0002] Overhead cables are overhead conductors with insulation layers and protective sheaths, manufactured using a process similar to that of cross-linked cables. They represent a new power transmission method between overhead conductors and underground cables. Overhead cables are all single-core and, based on their structure, can be classified into hard aluminum wire structure, hard-drawn copper wire structure, aluminum alloy wire structure, steel core or aluminum alloy core supported structure, and self-supporting three-core composite structure (the core can be hard aluminum or hard copper wire), etc. They are characterized by high power supply reliability, good power supply safety, convenient installation and maintenance, and reasonable economic efficiency. Their main technical parameters include weather resistance, insulation level, and inner and outer semiconductive shielding layers. Overhead cables are widely used in power transmission both domestically and internationally.

[0003] For example, Chinese Patent CN217982886U discloses an aluminum alloy cable, which is a lightweight aluminum alloy corrosion-resistant overhead cable. It includes a conductor core, an insulation layer fixedly installed on the outer surface of the conductor core, and a shielding layer fixedly installed on the outer surface of the insulation layer. This lightweight aluminum alloy corrosion-resistant overhead cable, through the setting of connecting components, allows the first and second support frames to support the contact layer and corrosion-resistant layer when subjected to pressure. This protects the conductor core, insulation layer, and shielding layer from external pressure, minimizing the risk of compression and ensuring normal transmission of the conductor core. Simultaneously, the cavity formed at the connection between the first and second support frames reduces the weight of the overhead cable, facilitating its movement during operation and solving the problem of low support strength.

[0004] However, overhead cables are used outdoors and at high altitudes for extended periods, which requires them to have high resistance to wear and aging, as well as corrosion resistance. In addition, long-term outdoor use also requires the cables to have good insulation performance. The corrosion resistance and insulation performance of the overhead cable in the aforementioned patent are not fully demonstrated, which means that the structure of the overhead cable described in the patent cannot effectively protect the cable during outdoor operation, resulting in cable damage. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defects of the existing technology and provide a high-efficiency insulated and corrosion-resistant overhead cable with high overall strength, high-efficiency insulation and good corrosion resistance.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a high-efficiency insulated and corrosion-resistant overhead cable, comprising an inner sheath and an outer sheath. The inner sheath contains a conductor, and an inner shielding layer and an insulation layer are sequentially disposed on the outside of the conductor. The insulation layer includes an inner layer, a middle layer, and an outer layer sequentially disposed on the outside of the inner shielding layer. A semi-conductive layer, an outer shielding layer, and a waterproof layer are sequentially disposed from the inside to the outside between the inner sheath and the outer sheath. The outer sheath includes an anti-corrosion layer and an anti-aging layer sequentially disposed on the outside of the waterproof layer.

[0007] Furthermore, the inner shielding layer is a semi-conductive cross-linked polyethylene layer extruded on the outside of the conductor, with a thickness of 0.5-1.0 mm, and carbon nanotubes are incorporated therein.

[0008] Furthermore, the inner layer is ultra-smooth cross-linked polyethylene, the middle layer is an XLPE composite material with added boron nitride nanosheets, and the outer layer is a fluorinated ethylene propylene copolymer.

[0009] Furthermore, the semiconductive layer is a graphene-modified EVA composite material.

[0010] Furthermore, the outer shielding layer is a longitudinally welded aluminum sheath with a thickness of 1.5mm.

[0011] Furthermore, the waterproof layer is a water-blocking strip wrapped around the outer shielding layer.

[0012] Furthermore, the anti-corrosion layer is made of polyvinylidene fluoride.

[0013] Furthermore, the anti-aging layer is made of high-density polyethylene.

[0014] By adopting the above technical solution, this utility model has the following beneficial effects: the semi-conductive layer can increase the cable's resistance to electrolytic corrosion and improve its flexibility; the outer shielding layer is a longitudinally welded aluminum sheath with a thickness of 1.5mm, coated with epoxy resin primer and polyurethane topcoat, which can effectively improve its salt spray resistance; the anti-corrosion layer not only provides anti-corrosion effect but also provides a certain degree of wear resistance and impact resistance, thereby ensuring the stable operation of the cable; the anti-aging layer is made of high-density polyethylene, which has good heat and cold resistance, good chemical stability, high rigidity and toughness, and good mechanical strength; at the same time, antioxidants and ultraviolet absorbers are added to improve its aging resistance. The anti-corrosion layer and the anti-aging layer work together to achieve dual protection against chemical corrosion and mechanical damage. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the high-efficiency insulated and corrosion-resistant overhead cable of this utility model.

[0016] Reference numerals: 1. Inner protective layer; 2. Outer protective layer; 3. Semiconductor layer; 4. Outer shielding layer; 5. Waterproof layer;

[0017] 6. Inner shielding layer; 7. Insulation layer; 11. Conductor; 12. Non-woven fabric layer; 21. Anti-corrosion layer;

[0018] 22. Anti-aging layer; 71. Inner layer; 72. Middle layer; 73. Outer layer. Detailed Implementation

[0019] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] like Figure 1 As shown, in this embodiment, a high-efficiency insulated and corrosion-resistant overhead cable is provided, including an inner sheath 1 and an outer sheath 2. The inner sheath 1 is provided with a conductor 11. Between the inner sheath 1 and the outer sheath 2, a semi-conductive layer 3, an outer shielding layer 4 and a waterproof layer 5 are provided sequentially from the inside to the outside. The outer sheath 2 includes an anti-corrosion layer 21 and an anti-aging layer 22 sequentially disposed outside the waterproof layer 5.

[0021] In this embodiment, conductor 11 is made of AA-8030 series aluminum alloy conductor, which can greatly improve the conductivity and high temperature resistance of aluminum alloy cable, while also improving creep resistance and corrosion resistance. Conductor 11 is made of multiple strands twisted together, which can increase the surface area to reduce the skin effect. A nano-level zinc-magnesium alloy layer (Zn-5%Mg) is plated on the outer layer to enhance atmospheric corrosion resistance. After conductor 11 is twisted, a non-woven fabric layer 12 is wrapped around its outer side. The non-woven fabric layer 12 can serve as a reinforcing material to improve the overall load-bearing capacity and compressive strength of the cable. At the same time, the non-woven fabric has good electrical insulation properties, which can effectively isolate the internal conductor of the cable from the external environment and avoid the risk of short circuit or leakage.

[0022] In this embodiment, an inner shielding layer 6 and an insulating layer 7 are sequentially provided on the outer side of the conductor 11. The inner shielding layer 6 is a semi-conductive cross-linked polyethylene layer extruded on the outer side of the conductor 11 with a thickness of 0.5-1.0 mm to ensure uniform electric field distribution and suppress partial discharge. Carbon nanotubes are incorporated into it to improve conductivity uniformity and reduce interface defects of the insulating layer 7.

[0023] In this embodiment, the insulating layer 7 includes an inner layer 71, a middle layer 72, and an outer layer 73. The inner layer 71 is ultra-smooth cross-linked polyethylene with a dielectric strength ≥30kV / mm. The middle layer 72 is an XLPE composite material with added boron nitride nanosheets, which can improve thermal conductivity and electrical tracking resistance. The outer layer 73 is a fluorinated ethylene propylene copolymer with excellent weather resistance. The three-layer co-extrusion one-step molding process reduces production steps and achieves high-efficiency insulation.

[0024] In this embodiment, the semiconductive layer 3 is a graphene-modified EVA composite material with a resistivity ≤100Ω·m, which combines flexibility and resistance to electrolytic corrosion.

[0025] In this embodiment, the outer shielding layer 4 is a longitudinally welded aluminum sheath with a thickness of 1.5mm, and is coated with epoxy resin primer and polyurethane topcoat, which can effectively improve its salt spray resistance.

[0026] In this embodiment, the waterproof layer 5 is a water-blocking strip wrapped around the outer shielding layer 4, which plays a preliminary role in blocking and waterproofing water.

[0027] In this embodiment, the anti-corrosion layer 21 is made of polyvinylidene fluoride. Polyvinylidene fluoride has excellent chemical corrosion resistance, excellent high temperature color change resistance and oxidation resistance. It also has excellent wear resistance, flexibility, high tensile strength and impact resistance. The anti-corrosion layer 21 can play a certain role in wear resistance and impact resistance while providing anti-corrosion effect, thereby ensuring the stable operation of the cable.

[0028] In this embodiment, the anti-aging layer 22 is made of high-density polyethylene, which has good heat and cold resistance, good chemical stability, high rigidity and toughness, and good mechanical strength. At the same time, antioxidants and ultraviolet absorbers are added to it to improve its aging resistance. The anti-corrosion layer 21 and the anti-aging layer 22 work together to achieve dual protection against chemical corrosion and mechanical damage.

[0029] The high-efficiency insulated and corrosion-resistant overhead cable proposed in this utility model has the following advantages: the semi-conductive layer 3 can increase the cable's resistance to electrolytic corrosion and improve its flexibility; the outer shielding layer 4 is a longitudinally welded aluminum sheath with a thickness of 1.5mm, coated with epoxy resin primer and polyurethane topcoat, which can effectively improve its salt spray resistance; the anti-corrosion layer 21 not only provides anti-corrosion effect but also provides a certain degree of wear resistance and impact resistance, thereby ensuring the stable operation of the cable; the anti-aging layer 22 is made of high-density polyethylene, which has good heat resistance and cold resistance, good chemical stability, and also has high rigidity and toughness, and good mechanical strength; at the same time, antioxidants and ultraviolet absorbers are added to improve its aging resistance. The anti-corrosion layer 21 and the anti-aging layer 22 work together to achieve dual protection against chemical corrosion and mechanical damage.

[0030] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-efficiency insulated and corrosion-resistant overhead cable, characterized in that: It includes an inner sheath (1) and an outer sheath (2). The inner sheath (1) contains a conductor (11). An inner shielding layer (6) and an insulating layer (7) are sequentially provided on the outside of the conductor (11). The insulating layer (7) includes an inner layer (71), an intermediate layer (72) and an outer layer (73) sequentially disposed on the outside of the inner shielding layer (6). A semiconductive layer (3), an outer shielding layer (4) and a waterproof layer (5) are sequentially disposed from the inside to the outside between the inner sheath (1) and the outer sheath (2). The outer sheath (2) includes an anti-corrosion layer (21) and an anti-aging layer (22) sequentially disposed on the outside of the waterproof layer (5).

2. A high efficiency insulated corrosion resistant aerial cable as claimed in claim 1, wherein: The inner shielding layer (6) is a semi-conductive cross-linked polyethylene layer extruded on the outside of the conductor (11), with a thickness of 0.5-1.0 mm, and carbon nanotubes are incorporated therein.

3. The high efficiency insulated corrosion resistant aerial cable of claim 1, wherein: The inner layer (71) is ultra-smooth cross-linked polyethylene, the middle layer (72) is XLPE composite material with added boron nitride nanosheets, and the outer layer (73) is fluorinated ethylene propylene copolymer.

4. The high efficiency insulated corrosion resistant aerial cable of claim 1, wherein: The semiconductive layer (3) is a graphene-modified EVA composite material.

5. The high efficiency insulated corrosion resistant aerial cable of claim 1, wherein: The outer shielding layer (4) is a longitudinally welded aluminum sheath with a thickness of 1.5 mm.

6. A high efficiency insulated corrosion resistant aerial cable as claimed in claim 1, wherein: The waterproof layer (5) is a water-blocking strip wrapped around the outer shielding layer (4).

7. The high efficiency insulated corrosion resistant aerial cable of claim 1, wherein: The anti-corrosion layer (21) is made of polyvinylidene fluoride.

8. The high efficiency insulated corrosion resistant aerial cable of claim 1, wherein: The anti-aging layer (22) is made of high-density polyethylene.

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