Medium-voltage aluminum alloy cable with fiber resin-based composite core

Abstract

The utility model discloses a fiber resin-based composite core medium-voltage aluminum alloy cable, which comprises a fiber resin-based composite core and two layers of rare earth high-iron aluminum alloy fan-shaped conductors which are twisted around the fiber resin-based composite core to form an aluminum alloy conductor layer. A semi-conductive nylon tape inner wrapping layer, an ethylene propylene diene monomer insulating layer, a semi-conductive nylon tape outer wrapping layer, a polyester fiber plain woven fabric inner wrapping layer, a metal shielding layer, a polyester fiber plain woven fabric outer wrapping layer and an EVA sheath layer are sequentially wrapped outside the aluminum alloy conductor layer, and a plurality of longitudinal grooves are uniformly distributed in the inner circumferential surface of the EVA sheath layer in the circumferential direction. The cable is light in weight, high in strength, better in corrosion resistance, better in laying and installation adaptability in complex environments, resistant to abrasion and long in service life.

Description

Technical Field

[0001] The present application relates to the technical field of cables, and in particular to a medium-voltage aluminum alloy cable with a fiber resin-based composite core. Background Art

[0002] Medium voltage power cables transmit electric energy for power transmission and distribution systems. They are lightweight and moisture-resistant and can be laid indoors and outdoors, in direct burial, bridges, pipes, brackets, cable trenches and other environments. Although cross-linked polyethylene power cables are widely used due to their simple manufacturing and safety processes, the linear expansion coefficients of the insulation layer and the outer sheath of ordinary cross-linked polyethylene cable products are quite different. In the production process, there will be gaps between the layers, which can easily cause the outer sheath to shift and reduce the electrical properties of the cable. In addition, ordinary cross-linked polyethylene cables have poor flexibility in outdoor low-temperature environments, making it difficult to lay and distribute wires, and the outer skin is often worn and cracked. With the development trend of high-quality and efficient production and manufacturing of power cable products, while meeting the excellent production process of power cables, it is necessary to ensure the flexibility and wear resistance of power cables at low temperatures, and also to consider corrosion resistance, sag characteristics, power loss and other properties, which will help reduce line construction costs and improve line operation safety. Utility Model Content

[0003] The present application aims to solve the technical problem of providing a fiber resin-based composite core medium-voltage aluminum alloy cable with light weight, high strength, better corrosion resistance, better adaptability to laying and installation in complex environments, wear resistance and long service life in order to address the deficiencies in the prior art.

[0004] This application solves the above technical problems through the following technical solutions.

[0005] A fiber resin-based composite core medium-voltage aluminum alloy cable comprises a fiber resin-based composite core, two layers of rare earth high-iron aluminum alloy fan-shaped conductors are twisted around the outside of the fiber resin-based composite core to form an aluminum alloy conductor layer, the fiber resin-based composite core comprises a plurality of glass fiber composite cores twisted together, the glass fiber composite core comprises stainless steel monofilaments, a plurality of glass fiber core materials surround the outside of the stainless steel monofilaments and are hardened by impregnation with epoxy resin to form a composite core body, the composite core body is coated with a PET coating layer on the outside, the aluminum alloy conductor layer is coated with a semi-conductive nylon tape inner wrapping layer, an EPDM rubber insulation layer, a semi-conductive nylon tape outer wrapping layer, a polyester fiber plain woven cloth inner wrapping layer, a metal shielding layer, a polyester fiber plain woven cloth outer wrapping layer and an EVA sheath layer in sequence, and a plurality of longitudinal grooves are evenly distributed on the inner circumferential surface of the EVA sheath layer in a circumferential direction.

[0006] Preferably, the depth of the longitudinal groove does not exceed 2 mm.

[0007] Preferably, the EVA sheath layer has a thickness of 3 mm to 5 mm and an outer diameter of 28 mm to 60 mm.

[0008] Preferably, the rare earth high-iron aluminum alloy fan-shaped conductor is a plurality of rare earth high-iron aluminum alloy wires twisted and pressed into a fan-shaped conductor structure, and the diameter of the rare earth high-iron aluminum alloy wire is 1 mm to 3 mm.

[0009] Preferably, the inner and outer layers of the semi-conductive nylon tape are both multi-layer overlapping structures of the semi-conductive nylon tape with an overlap rate of 40% to 50%, the thickness of the semi-conductive nylon tape is 0.4mm to 0.5mm, and the width of the semi-conductive nylon tape is 30mm to 60mm.

[0010] Preferably, the metal shielding layer is formed by spirally winding a plurality of aluminum alloy wires with a wire diameter of 0.4 mm to 0.6 mm.

[0011] Preferably, the EPDM rubber insulation layer has a thickness of 8 mm to 16 mm.

[0012] Preferably, the metal shielding layer has a thickness of 0.8 mm to 1 mm.

[0013] Preferably, the inner wrapping layer of the polyester fiber plain woven fabric is an inner layer of polyester fiber plain woven fabric overlapping and wrapping structure with an overlap rate of 25% to 50%, the inner layer of the polyester fiber plain woven fabric has a thickness of 0.1mm to 0.4mm and a width of 30mm to 70mm, and the outer wrapping layer of the polyester fiber plain woven fabric is an outer layer of polyester fiber plain woven fabric overlapping and wrapping structure with an overlap rate of 40% to 50%, the outer layer of the polyester fiber plain woven fabric has a thickness of 0.05mm to 0.2mm and a width of 50mm to 90mm.

[0014] Preferably, the winding direction of the inner wrapping layer of the polyester fiber plain woven fabric is opposite to the winding direction of the outer wrapping layer of the polyester fiber plain woven fabric.

[0015] Beneficial effects of this application:

[0016] 1. The fiber resin-based composite core and aluminum alloy conductor layer are used to form a fiber resin-based composite core aluminum stranded wire conductor structure to replace the traditional steel core aluminum stranded wire conductor. The mechanical, thermal and electrical properties of the fiber resin-based composite core aluminum stranded wire are better than those of the traditional aluminum stranded wire conductor. It is light in weight and has higher strength. When the outer diameter is the same as that of the steel core aluminum stranded wire, the aluminum conductive area is increased, the line loss is greatly reduced, and under the same load, the weight of the stranded wire and the line sag are reduced, which is beneficial to reducing the cost of line installation and erection. The linear expansion coefficient is small, and the curvature is small in the operating temperature range from the lowest temperature to the highest temperature. It is more corrosion-resistant than the steel core structure and has a longer service life.

[0017] 2. By adding longitudinal grooves on the inner circumference of the EVA sheath layer, the friction area between the sheath layer and the outer layer of the polyester fiber plain woven cloth is reduced while ensuring the mechanical strength of the sheath layer. While reducing the friction, it helps to improve the flexibility and flexural resistance of the cable, reduce the torque during bending, protect the sheath layer, and increase safety and reliability. It has stronger adaptability to laying and installation in complex environments.

[0018] 3. By adding inner and outer wrapping layers of polyester fiber plain woven fabric to the inner and outer layers of the metal shielding layer, it is beneficial to enhance the flexibility of the cable, reduce the stress concentration of the shielding layer when subjected to bending, and reduce the occurrence of wire breakage in the metal shielding layer. The thickness and width of the inner and outer wrapping layers of the polyester fiber plain woven fabric are optimized to be different, which is beneficial to the formation of slippage between the inner and outer wrapping layers and the shielding layer, reducing torque and reducing local stress concentration in the shielding layer. The cable has better flexibility and bending resistance, ensuring the excellent electrical properties of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0020] Description of reference numerals:

[0021] 1-fiber resin based composite core, 2-rare earth high iron aluminum alloy fan-shaped conductor, 3-glass fiber composite core, 4-stainless steel monofilament, 5-composite core, 6-PET coating, 7-semi-conductive nylon tape inner winding layer, 8-EPDM rubber insulation layer, 9-semi-conductive nylon tape outer winding layer, 10-polyester fiber plain woven cloth inner winding layer, 11-metal shielding layer, 12-polyester fiber plain woven cloth outer winding layer, 13-EVA sheath layer, 14-longitudinal groove. DETAILED DESCRIPTION

[0022] The terms used in the implementation method part of this application are only used to explain the specific embodiments of this application, and are not intended to limit this application. The implementation method of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0023] See also Figure 1The fiber resin-based composite core medium-voltage aluminum alloy cable of the embodiment of the present application comprises a fiber resin-based composite core 1, and two layers of rare earth high-iron aluminum alloy fan-shaped conductors 2 are twisted around the outside of the fiber resin-based composite core 1 to form an aluminum alloy conductor layer. Specifically, the rare earth high-iron aluminum alloy fan-shaped conductor 2 is a plurality of rare earth high-iron aluminum alloy wires twisted and pressed into a fan-shaped conductor structure, and the diameter of the rare earth high-iron aluminum alloy wire is 1mm to 3mm. The fiber resin-based composite core 1 comprises a plurality of glass fiber composite cores 3 twisted together, and the glass fiber composite core 3 comprises stainless steel monofilaments 4, and a plurality of glass fiber core materials surround the outside of the stainless steel monofilaments 4 and are hardened by impregnation with epoxy resin to form a composite core body 5, and the composite core body 5 is coated with a PET coating layer 6 on the outside.

[0024] The aluminum alloy conductor layer is coated with a semi-conductive nylon tape inner wrapping layer 7, an EPDM rubber insulation layer 8, a semi-conductive nylon tape outer wrapping layer 9, a polyester fiber plain woven fabric inner wrapping layer 10, a metal shielding layer 11, a polyester fiber plain woven fabric outer wrapping layer 12 and an EVA sheath layer 13 in sequence. In one embodiment, the semi-conductive nylon tape inner wrapping layer 7 and the semi-conductive nylon tape outer wrapping layer 9 are both semi-conductive nylon tape multi-layer overlapping wrapping structures with an overlap rate of 40% to 50%, the thickness of the semi-conductive nylon tape is 0.4mm to 0.5mm, and the width of the semi-conductive nylon tape is 30mm to 60mm. The EPDM rubber insulation layer 8 has a thickness of 8mm to 16mm. In one embodiment, the inner polyester fiber woven fabric wrapping layer 10 is an inner polyester fiber woven fabric overlap wrapping structure with an overlap rate of 25% to 50%, the inner polyester fiber woven fabric has a thickness of 0.1mm to 0.4mm and a width of 30mm to 70mm, the outer polyester fiber woven fabric wrapping layer 12 is an outer polyester fiber woven fabric overlap wrapping structure with an overlap rate of 40% to 50%, the outer polyester fiber woven fabric has a thickness of 0.05mm to 0.2mm and a width of 50mm to 90mm, and further, the inner polyester fiber woven fabric wrapping layer 10 is wound in the opposite direction to the outer polyester fiber woven fabric wrapping layer 12. In one embodiment, the metal shielding layer 11 is formed by spirally winding a plurality of aluminum alloy wires with a wire diameter of 0.4mm to 0.6mm. The EVA sheath layer 13 has a thickness of 3mm to 5mm and an outer diameter of 28mm to 60mm. The metal shielding layer 11 has a thickness of 0.8mm to 1mm. A plurality of longitudinal grooves 14 are evenly distributed circumferentially on the inner circumferential surface of the EVA sheath layer 13. Furthermore, the depth of the longitudinal grooves 14 does not exceed 2 mm.

[0025] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed in the present application, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered by the protection scope of the present application.

Claims

1. Fiber resin based composite core medium voltage aluminum alloy cable, characterized by: Includes fiber A resin-based composite core (1), two layers of rare earth high-iron aluminum alloy fan-shaped conductors (2) are twisted around the outside of the fiber resin-based composite core (1) to form an aluminum alloy conductor layer, the fiber resin-based composite core (1) comprises a plurality of glass fiber composite cores (3) twisted together, the glass fiber composite core (3) comprises stainless steel monofilaments (4), a plurality of glass fiber core materials are wrapped around the outside of the stainless steel monofilaments (4) and hardened by impregnation with epoxy resin to form a composite core body (5), the composite core body (5) is coated with a PET coating layer (6) on the outside, and the aluminum alloy conductor layer is sequentially coated with a semi-conductive nylon tape inner wrapping layer (7), an EPDM rubber insulation layer (8), a semi-conductive nylon tape outer wrapping layer (9), a polyester fiber plain woven fabric inner wrapping layer (10), a metal shielding layer (11), a polyester fiber plain woven fabric outer wrapping layer (12) and an EVA sheath layer (13), and the inner circumferential surface of the EVA sheath layer (13) is uniformly provided with a plurality of longitudinal grooves (14) in a circumferential direction.

2. The fiber resin matrix composite core medium voltage aluminum alloy cable according to claim 1, characterized in that: The depth of the longitudinal groove (14) does not exceed 2 mm.

3. The fiber resin matrix composite core medium voltage aluminum alloy cable according to claim 1, characterized in that: The EVA sheath layer (13) has a thickness of 3 mm to 5 mm and an outer diameter of 28 mm to 60 mm.

4. The fiber resin matrix composite core medium voltage aluminum alloy cable according to claim 1, characterized in that: rare earth The high-iron aluminum alloy fan-shaped conductor (2) is a plurality of rare earth high-iron aluminum alloy wires twisted and pressed into a fan-shaped conductor structure, and the diameter of the rare earth high-iron aluminum alloy wire is 1 mm to 3 mm.

5. The fiber resin matrix composite core medium voltage aluminum alloy cable according to claim 1, characterized in that: The inner semi-conductive nylon tape wrapping layer (7) and the outer semi-conductive nylon tape wrapping layer (9) are both semi-conductive nylon tape multi-layer overlapping wrapping structures with an overlap rate of 40% to 50%, a thickness of 0.4 mm to 0.5 mm, and a width of 30 mm to 60 mm.

6. The fiber resin matrix composite core medium voltage aluminum alloy cable according to claim 1, characterized in that: The metal shielding layer (11) is formed by spirally winding a plurality of aluminum alloy wires with a wire diameter of 0.4 mm to 0.6 mm.

7. The fiber resin matrix composite core medium voltage aluminum alloy cable according to claim 1, characterized in that: The EPDM rubber insulation layer (8) has a thickness of 8 mm to 16 mm.

8. The fiber resin matrix composite core medium voltage aluminum alloy cable according to claim 1, characterized in that: The thickness of the metal shielding layer (11) is 0.8 mm to 1 mm.

9. The fiber resin matrix composite core medium voltage aluminum alloy cable according to claim 1, characterized in that: The inner polyester fiber plain woven fabric wrapping layer (10) is an inner polyester fiber plain woven fabric overlapping wrapping structure with an overlap rate of 25% to 50%, the inner polyester fiber plain woven fabric has a thickness of 0.1 mm to 0.4 mm and a width of 30 mm to 70 mm, and the outer polyester fiber plain woven fabric wrapping layer (12) is an outer polyester fiber plain woven fabric overlapping wrapping structure with an overlap rate of 40% to 50%, the outer polyester fiber plain woven fabric has a thickness of 0.05 mm to 0.2 mm and a width of 50 mm to 90 mm.

10. The fiber resin matrix composite core medium voltage aluminum alloy cable according to claim 9, characterized in that: The winding direction of the inner polyester fiber plain woven fabric layer (10) is opposite to the winding direction of the outer polyester fiber plain woven fabric layer (12).

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