CN221861305U - Low wind pressure fiber resin matrix composite core overhead cable - Google Patents

Abstract

The utility model discloses a low wind pressure fiber resin matrix composite core overhead cable, which comprises a fiber resin matrix composite core, wherein two or three layers of rare earth high iron aluminum alloy fan-shaped conductors are stranded around the outside of the fiber resin matrix composite core to form an aluminum alloy conductor layer, the outside of the aluminum alloy conductor layer is sequentially coated with a semiconductive nylon resin shielding layer and a crosslinked polyethylene insulating layer, a plurality of longitudinal grooves are circumferentially uniformly distributed on the inner peripheral surface of the crosslinked polyethylene insulating layer, the radial depth of each longitudinal groove is 0.15mm to 0.2mm, a plurality of longitudinal protrusions are circumferentially distributed on the outer peripheral surface of the crosslinked polyethylene insulating layer, the radial height of each longitudinal protrusion is 0.08mm to 0.25mm, and the outer diameter of the crosslinked polyethylene insulating layer is 10mm to 27mm. The cable has the advantages of light weight, high strength, corrosion resistance, strong wind resistance, smaller wind resistance coefficient and effective reduction of wind load bearing influence.

Description

Low wind pressure fiber resin based composite core overhead cable

Technical Field

The present application belongs to the field of cable technology, and in particular relates to a low wind pressure fiber resin-based composite core overhead cable.

Background Art

With the continuous improvement of high-voltage power technology and the acceleration of global urbanization, cross-linked polyethylene medium-voltage power cables are being promoted and applied by more and more distribution systems due to their excellent performance, simple and easy manufacturing safety process and other excellent characteristics. Cross-linked polyethylene medium-voltage power cables are used in overhead transmission lines and need to have better mechanical parameters and electrical characteristics such as flexibility, tensile strength and mechanical strength than ordinary power cable products. In recent years, the number of overhead transmission lines in my country has increased significantly. Due to the influence of factors such as climate and environment in the installation area, and the test of many different natural conditions and climatic conditions such as wind, rain, snow and ice, many overhead transmission lines face the risk of increased dancing, which can easily cause significant losses in personnel and funds. The main factor causing the dancing of overhead transmission lines comes from the wind load of the wires. In order to ensure the safe operation of overhead transmission lines, the research and development of low-wind pressure overhead cables as the key research direction of transmission lines has become an inevitable trend.

Utility Model Content

The present application aims to solve the technical problem of providing a low-wind-pressure fiber resin-based composite core overhead cable with light weight, high strength, corrosion resistance, strong wind resistance, a smaller wind resistance coefficient, and effectively reducing the impact of wind loads.

This application solves the above technical problems through the following technical solutions.

A low wind pressure fiber resin-based composite core overhead cable comprises a fiber resin-based composite core, two or three 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 sequentially coated with a semi-conductive nylon resin shielding layer and a cross-linked polyethylene insulation layer on the outside, the inner circumference of the cross-linked polyethylene insulation layer is uniformly distributed with a plurality of longitudinal grooves in a circumferential direction, the radial depth of the longitudinal grooves is 0.15 mm to 0.2 mm, the outer circumferential surface of the cross-linked polyethylene insulation layer is uniformly distributed with a plurality of longitudinal protrusions in a circumferential direction, the radial height of the longitudinal protrusions is 0.08 mm to 0.25 mm, and the outer diameter of the cross-linked polyethylene insulation layer is 10 mm to 27 mm.

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.

Preferably, the lay direction of the rare earth high iron aluminum alloy wire is opposite to that of the rare earth high iron aluminum alloy fan-shaped conductor.

Preferably, the PET coating layer is a multi-layer PET resin tape overlapping and wrapping structure, and the winding direction is the same as the twisting direction of the rare earth high iron aluminum alloy sector conductor.

Preferably, the semi-conductive nylon resin shielding layer is a multi-layer overlapping wrapping structure of a semi-conductive nylon tape with an overlap rate of 40% to 50%, a thickness of the semi-conductive nylon tape of 0.4 mm to 0.5 mm, and a width of the semi-conductive nylon tape of 30 mm to 60 mm.

Preferably, the winding direction of the semi-conductive nylon tape is opposite to the twisting direction of the rare earth high iron aluminum alloy sector-shaped conductor.

Preferably, the outer diameter of the aluminum alloy conductor layer is 7 mm to 19 mm.

Preferably, the cross-section of the longitudinal groove is semicircular or fan-shaped.

Preferably, the cross-section of the longitudinal protrusion is semicircular.

Beneficial effects of this application:

1. By evenly distributing longitudinal protrusions on the outer circumference of the cross-linked polyethylene insulation layer and rationally designing the radial height of the longitudinal protrusions to be 0.08mm to 0.25mm, it does not affect the mechanical strength of the insulation layer while helping to reduce the drag coefficient, reduce the reflow area, and effectively reduce the size of the wind load. When used in strong wind areas, it can effectively reduce the adverse effects of strong winds on transmission lines and ensure the safe operation of overhead transmission lines.

2. A fiber resin-based composite core aluminum stranded wire conductor structure is formed by using a fiber resin-based composite core and an aluminum alloy conductor layer 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. With the same outer diameter as the steel core aluminum stranded wire, it increases the aluminum conductive area and greatly reduces the line loss. Under the same load, it reduces the weight of the stranded wire and the line sag, which is beneficial to reducing the cost of line installation and erection. It has a small linear expansion coefficient and a small curvature 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.

3. By adding longitudinal grooves on the inner circumference of the cross-linked polyethylene insulation layer and controlling the radial height of the longitudinal grooves to 0.08mm to 0.25mm, the friction area between the insulation layer and the semi-conductive nylon resin shielding layer is reduced while ensuring the mechanical strength of the insulation layer. While reducing the friction, it helps to improve the flexibility and bending resistance of the cable, protect the insulation layer, extend its service life, and improve durability.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

Description of reference numerals:

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 body, 6-PET coating layer, 7-semi-conductive nylon resin shielding layer, 8-cross-linked polyethylene insulation layer, 9-longitudinal groove, 10-longitudinal protrusion.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

Referring to Fig. 1, the low wind pressure fiber resin-based composite core overhead cable of the embodiment of the present application comprises a fiber resin-based composite core 1, and two or three 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, and the outer diameter of the aluminum alloy conductor layer is 7mm to 19mm. 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. Furthermore, the twist direction of the rare earth high-iron aluminum alloy wire is opposite to the twist direction of the rare earth high-iron aluminum alloy fan-shaped conductor 2. The fiber resin-based composite core 1 includes a plurality of glass fiber composite cores 3 twisted together, the glass fiber composite core 3 includes a stainless steel monofilament 4, a plurality of glass fiber core materials surround the outside of the stainless steel monofilament 4 and are 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. In one embodiment, the PET coating layer 6 is a multi-layer PET resin tape overlapping and wrapping structure and the winding direction is the same as the twisting direction of the rare earth high-iron aluminum alloy fan-shaped conductor 2.

The aluminum alloy conductor layer is coated with a semi-conductive nylon resin shielding layer 7 and a cross-linked polyethylene insulation layer 8 in sequence. In one embodiment, the semi-conductive nylon resin shielding layer 7 is a semi-conductive nylon tape multi-layer overlapping wrapping structure 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. Further, the winding direction of the semi-conductive nylon tape is opposite to the twisting direction of the rare earth high iron aluminum alloy sector conductor 2. A plurality of longitudinal grooves 9 are uniformly distributed circumferentially on the inner circumference of the cross-linked polyethylene insulation layer 8, and the radial depth of the longitudinal grooves 9 is 0.15mm to 0.2mm. The cross-section of the longitudinal grooves 9 is semicircular or fan-shaped. A plurality of longitudinal protrusions 10 are uniformly distributed circumferentially on the outer circumference of the cross-linked polyethylene insulation layer 8, and the radial height of the longitudinal protrusions 10 is 0.08mm to 0.25mm, and the cross-section of the longitudinal protrusions 10 is semicircular. The outer diameter of the cross-linked polyethylene insulation layer 8 is 10mm to 27mm.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims (9)

1. A low wind pressure fiber resin-based composite core overhead cable, characterized in that: it comprises a fiber resin-based composite core (1), two or three 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 a stainless steel monofilament (4), a plurality of glass fiber core materials are wrapped around the outside of the stainless steel monofilament (4) and hardened by impregnation with epoxy resin to form a composite core body (5), the composite core body (5) is coated with PE The aluminum alloy conductor layer is coated with a semi-conductive nylon resin shielding layer (7) and a cross-linked polyethylene insulation layer (8) in sequence on its outer surface; a plurality of longitudinal grooves (9) are uniformly distributed in the circumferential direction on the inner circumferential surface of the cross-linked polyethylene insulation layer (8); the radial depth of the longitudinal grooves (9) is 0.15 mm to 0.2 mm; a plurality of longitudinal protrusions (10) are uniformly distributed in the circumferential direction on the outer circumferential surface of the cross-linked polyethylene insulation layer (8); the radial height of the longitudinal protrusions (10) is 0.08 mm to 0.25 mm; and the outer diameter of the cross-linked polyethylene insulation layer (8) is 10 mm to 27 mm. 2. The low wind pressure fiber resin-based composite core overhead cable according to claim 1 is characterized in that: 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 1 mm to 3 mm. 3. The low wind pressure fiber resin based composite core overhead cable according to claim 2, characterized in that the lay direction of the rare earth high iron aluminum alloy wire is opposite to the lay direction of the rare earth high iron aluminum alloy fan-shaped conductor (2). 4. The low wind pressure fiber resin based composite core overhead cable according to claim 1 is characterized in that: the PET coating layer (6) is a multi-layer PET resin tape overlapping and wrapping structure and the winding direction is the same as the twisting direction of the rare earth high iron aluminum alloy fan-shaped conductor (2). 5. The low wind pressure fiber resin-based composite core overhead cable according to claim 1 is characterized in that: the semi-conductive nylon resin shielding layer (7) is a semi-conductive nylon tape multi-layer overlapping wrapping structure 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. 6. The low wind pressure fiber resin based composite core overhead cable according to claim 5, characterized in that the winding direction of the semi-conductive nylon tape is opposite to the twisting direction of the rare earth high iron aluminum alloy fan-shaped conductor (2). 7. The low wind pressure fiber resin based composite core overhead cable according to claim 1 is characterized in that the outer diameter of the aluminum alloy conductor layer is 7 mm to 19 mm. 8. The low wind pressure fiber resin-based composite core overhead cable according to claim 1, characterized in that the cross section of the longitudinal groove (9) is semicircular or fan-shaped. 9. The low wind pressure fiber resin-based composite core overhead cable according to claim 1, characterized in that the cross section of the longitudinal protrusion (10) is semicircular.