10kV high-conductivity aluminum core cross-linked polyethylene insulated overhead cable

Abstract

The utility model relates to the technical field of wires and cables, in particular to a 10kV high-conductivity aluminum core cross-linked polyethylene insulated overhead cable, which comprises a conductor, a semi-conductive layer and an insulating layer which are distributed from inside to outside, the conductor comprises a plurality of layers of stranded structures, each layer of stranded structure comprises a plurality of aluminum alloy wires, and a waterproof layer is arranged between every two layers of stranded structures; wherein the water-blocking layer comprises a first water-blocking tape and a second water-blocking tape. According to the aluminum alloy overhead cable, the aluminum alloy conductors with high conductivity are adopted, the loss of a distribution line can be effectively reduced, meanwhile, the water-blocking tape is filled between the structural layers of the stranded conductors, compared with a water-blocking yarn filling and water-blocking tape winding mode, the mode is simpler, rapid and continuous production can be achieved through an automatic production line, the production efficiency is improved, and the production cost is reduced. Meanwhile, the covering area of the conductor is small, heat dissipation of the conductor is facilitated, and aging of the cable is delayed.

Description

Technical Field

[0001] This utility model relates to the field of wire and cable technology, and more specifically to a 10kV high conductivity aluminum core cross-linked polyethylene insulated overhead cable. Background Technology

[0002] Overhead aluminum conductors are primarily used in power system transmission lines, especially medium- and low-voltage transmission lines. They are erected on poles or supports to form overhead transmission lines, delivering electrical energy from power plants or substations to end users. Currently, overhead aluminum conductors are widely used in power systems, and market demand is steadily growing. With the rapid development of the power industry and the widespread application of new energy sources, the performance and quality requirements for overhead aluminum conductors are constantly increasing. In the future, overhead aluminum conductors will develop towards higher voltage levels, larger cross-sectional areas, and superior performance to meet the power system's demands for safe, reliable, and efficient power transmission.

[0003] Since overhead aluminum conductors are installed outdoors, the cables are susceptible to moisture. Usually, water-blocking tape is placed at the joints of the cables for water-blocking treatment, and the inside of the cables is filled with water-blocking yarn. However, the filling process of water-blocking yarn is complex and requires precise control. Otherwise, it will not achieve the water-blocking effect. In addition, the filling water-blocking yarn will affect the heat dissipation performance of the cable and accelerate the aging of the cable, which is not conducive to improving the performance of overhead aluminum conductors. Utility Model Content

[0004] In view of the technical problems existing in the overhead cables in the prior art, the first aspect of this utility model proposes a 10kV high conductivity aluminum core cross-linked polyethylene insulated overhead cable, which includes a conductor, a semi-conductive layer and an insulation layer distributed from the inside to the outside.

[0005] The conductor comprises a multi-layer stranded structure, each layer of which includes several aluminum alloy wires, and a water-blocking layer is provided between every two layers of stranded structure.

[0006] The water-blocking layer includes a first water-blocking strip and a second water-blocking strip. The width of the first water-blocking strip is greater than the spacing between two adjacent aluminum alloy wires, and the width of the second water-blocking strip is greater than or equal to the width of the first water-blocking strip.

[0007] The first water-blocking tape is longitudinally wrapped around the outer wall of the current structural layer. The angle between the longitudinal wrapping angle of the first water-blocking tape and the axis of the cable is less than 5°. The wrapping water-blocking tape is wrapped around the outer wall of the current structural layer and overlaps the outer wall of the first water-blocking tape, forming multiple overlapping positions with the first water-blocking tape. A sealed area is formed between every two overlapping positions. The coverage area of ​​the water-blocking layer on the current structural layer is less than 10%.

[0008] Preferably, the first water-blocking tape includes a non-woven fabric substrate and a water-blocking coating disposed on the surface of the non-woven fabric substrate, and the second water-blocking tape includes a non-woven fabric substrate and a water-blocking coating disposed on the surface of the non-woven fabric substrate.

[0009] Preferably, the nonwoven fabric substrate of the first water-blocking strip contains aramid fibers, which are arranged along the length direction of the first water-blocking strip.

[0010] Preferably, the water-blocking coating is disposed on the upper and lower surfaces of the nonwoven fabric substrate.

[0011] Preferably, the thickness of the first water-blocking strip and the second water-blocking strip is less than or equal to 0.15 mm.

[0012] Preferably, the aluminum alloy wire is an L3 type round hard aluminum wire with a conductivity of 62.5% IACS.

[0013] Preferably, the semiconductive layer includes a semiconductive material extrusion layer, and the outer wall of the semiconductive material extrusion layer is longitudinally wrapped with a copper-plastic composite strip.

[0014] Preferably, the insulating layer comprises a one-step silane cross-linked polyethylene insulating layer.

[0015] Compared with the prior art, the advantages of this utility model are:

[0016] The aluminum alloy overhead cable of this utility model uses aluminum alloy conductors with high conductivity, which can effectively reduce the loss of power distribution lines. At the same time, water-blocking tape is filled between the structural layers of the stranded conductor. Compared with water-blocking yarn, the winding method of water-blocking tape is simpler and can be quickly and continuously produced through automated production lines, improving production efficiency. Meanwhile, the small coverage area of ​​the conductor helps the conductor to dissipate heat and delays the aging of the cable. Attached Figure Description

[0017] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0018] Figure 1 This is a schematic diagram of the structure of the 10kV high conductivity aluminum core cross-linked polyethylene insulated overhead cable described in this utility model;

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the 10kV high conductivity aluminum core cross-linked polyethylene insulated overhead cable shown in this utility model. Detailed Implementation

[0020] To better understand the technical content of this utility model, specific embodiments are provided below in conjunction with the accompanying drawings.

[0021] Combination Figure 1 As shown, the first aspect of this utility model proposes a 10kV high conductivity aluminum core cross-linked polyethylene insulated overhead cable, comprising a conductor, a semiconducting layer 3, and an insulating layer 4 distributed from the inside out.

[0022] The conductor uses a stranded aluminum alloy wire structure, especially L3 type round hard aluminum wire with a conductivity of 62.5% IACS. The resistance of this aluminum alloy wire is 2.0% to 5.5% lower than that of conventional aluminum core insulated cables, which effectively reduces power distribution line losses and carbon emissions.

[0023] Furthermore, the semiconductive layer 3 includes a semiconductive material extrusion layer, and the insulating layer 4 includes a one-step silane cross-linked polyethylene insulating layer, giving the cable excellent conductivity and mechanical and physical properties.

[0024] Preferably, the outer wall of the extruded semiconducting material layer is longitudinally wrapped with a copper-plastic composite tape, which increases the radial water resistance of the cable and the electric field on the inner wall of the average insulation layer.

[0025] Combination Figure 1 and Figure 2 As shown, the conductor includes a multi-layer stranded structure, and each stranded structure includes several aluminum alloy wires. In order to improve the water-blocking performance of the conductor, especially to prevent water vapor from spreading axially from the cable joint, a water-blocking layer 2 is provided between every two stranded structures. The purpose of axial water blocking is achieved through the water-blocking layer 2.

[0026] The water-blocking layer 2 includes a first water-blocking strip and a second water-blocking strip. The width of the first water-blocking strip is greater than the spacing between two adjacent aluminum alloy wires. This is beneficial for laying the first water-blocking strip across the space between two adjacent aluminum alloy wires. The width of the second water-blocking strip is greater than or equal to the width of the first water-blocking strip. By increasing the width of the second water-blocking strip, a better water-blocking effect can be achieved.

[0027] Specifically, the first water-blocking tape is longitudinally wrapped around the outer wall of the current structural layer, the aluminum alloy wire is twisted to the left, and the first water-blocking tape is longitudinally wrapped to the right. The angle between the longitudinal wrapping angle of the first water-blocking tape and the axis of the cable is less than 5°.

[0028] Furthermore, the water-blocking tape is wrapped around the outer wall of the current structural layer and overlaps the outer wall of the first water-blocking tape, forming multiple overlapping positions with the first water-blocking tape. In this way, a sealed area is formed between every two overlapping positions. If water vapor enters the conductor along the axial direction, it must pass through multiple sealed areas and through the boundary of the sealed area formed by the first and second water-blocking tapes, which acts as a barrier to prevent water vapor from spreading along the conductor axial direction.

[0029] Understandably, this method of producing water-blocking layers is less difficult than filling water-blocking yarn, thus reducing production complexity.

[0030] Furthermore, the water-blocking layer 2 covers less than 10% of the current structural layer. Therefore, compared to filling with water-blocking yarn, this method is more conducive to conductor heat dissipation, which can improve the heat dissipation performance of the cable and delay cable aging.

[0031] like Figure 1 and Figure 2 As shown, the conductor includes an inner conductor 11, a middle conductor 12, and an outer conductor 13. The outer wall of the inner conductor 11 is provided with a first water-blocking strip a21 and a second water-blocking strip a22. The first water-blocking strip a21 is wound around the outer wall of the inner conductor 11 before the second water-blocking strip a22, and the winding direction is opposite to the twisting direction of the inner conductor 11. The middle conductor 12 is twisted around the outer layer of the water-blocking strip of the inner conductor. After twisting, the first water-blocking strip b23 and the second water-blocking strip b24 are wound around it. The outer conductor 13 is twisted around the outer layer of the middle water-blocking strip. After twisting, the first water-blocking strip c25 and the second water-blocking strip c26 are wound around it. The winding pitch of the second water-blocking strip a22, the second water-blocking strip b24, and the second water-blocking strip c26 is the same.

[0032] In the above embodiments, the first water-blocking strip includes a non-woven fabric substrate and a water-blocking coating disposed on the surface of the non-woven fabric substrate, and the second water-blocking strip includes a non-woven fabric substrate and a water-blocking coating disposed on the surface of the non-woven fabric substrate.

[0033] Optionally, the water-blocking coating can be a polyurethane coating, which is applied to the upper and lower surfaces of the nonwoven fabric substrate by brushing.

[0034] In an optional embodiment, in order to increase the tensile strength of the first water-blocking strip, aramid fibers are provided in the non-woven fabric substrate of the first water-blocking strip, and the aramid fibers are arranged along the length direction of the first water-blocking strip.

[0035] Specifically, in the process of manufacturing nonwoven tape, aramid fibers are woven directly into the structure of the nonwoven fabric as reinforcing ribs, which can make the aramid fibers and nonwoven fabric fibers tightly bonded together and improve the overall tensile strength.

[0036] Preferably, the thickness of the first and second water-blocking strips is less than or equal to 0.15 mm, so that the water-blocking strips wrapped between the conductors can fill the gap between the conductor layers as much as possible without increasing the overall outer diameter of the conductors.

[0037] In conjunction with the above embodiments, the aluminum alloy overhead cable of this utility model uses a high-conductivity aluminum alloy conductor, which can effectively reduce the loss of power distribution lines. At the same time, the water-blocking tape is filled between the structural layers of the stranded conductor. Compared with the filling of water-blocking yarn, the winding method of water-blocking tape is simpler and can be quickly and continuously produced through automated production lines, improving production efficiency. Meanwhile, the small coverage area of ​​the conductor helps the conductor to dissipate heat and delays the aging of the cable.

[0038] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A 10kV high-conductivity aluminum core cross-linked polyethylene insulated overhead cable, characterized in that, It includes conductors, a semiconducting layer (3) and an insulating layer (4) distributed from the inside out; The conductor includes a multi-layer stranded structure, each stranded structure includes several aluminum alloy wires, and a water-blocking layer (2) is provided between every two stranded structures. The water-blocking layer (2) includes a first water-blocking strip and a second water-blocking strip. The width of the first water-blocking strip is greater than the distance between two adjacent aluminum alloy wires, and the width of the second water-blocking strip is greater than or equal to the width of the first water-blocking strip. The first water-blocking tape is wrapped longitudinally on the outer wall of the current structural layer. The angle between the longitudinal wrapping angle of the first water-blocking tape and the axis of the cable is less than 5°. The second water-blocking tape is wrapped around the outer wall of the current structural layer and overlaps the outer wall of the first water-blocking tape, forming multiple overlapping positions with the first water-blocking tape. A sealed area is formed between every two overlapping positions. The coverage area of ​​the water-blocking layer (2) on the current structural layer is less than 10%.

2. The 10kV high conductivity aluminum core cross-linked polyethylene insulated overhead cable according to claim 1, characterized in that, The first water-blocking tape includes a non-woven fabric substrate and a water-blocking coating disposed on the surface of the non-woven fabric substrate, and the second water-blocking tape includes a non-woven fabric substrate and a water-blocking coating disposed on the surface of the non-woven fabric substrate.

3. The 10kV high conductivity aluminum core cross-linked polyethylene insulated overhead cable according to claim 2, characterized in that, The nonwoven fabric substrate of the first water-blocking tape contains aramid fibers, which are arranged along the length direction of the first water-blocking tape.

4. The 10kV high conductivity aluminum core cross-linked polyethylene insulated overhead cable according to claim 2, characterized in that, The water-blocking coating is applied to the upper and lower surfaces of the nonwoven fabric substrate.

5. The 10kV high conductivity aluminum core cross-linked polyethylene insulated overhead cable according to claim 1, characterized in that, The thickness of the first and second water-blocking strips is less than or equal to 0.15 mm.

6. The 10kV high conductivity aluminum core cross-linked polyethylene insulated overhead cable according to claim 1, characterized in that, The aluminum alloy wire used is L3 type round hard aluminum wire with a conductivity of 62.5% IACS.

7. The 10kV high conductivity aluminum core cross-linked polyethylene insulated overhead cable according to claim 1, characterized in that, The semiconductive layer (3) includes a semiconductive material extrusion layer, the outer wall of which is longitudinally wrapped with a copper-plastic composite strip.

8. The 10kV high conductivity aluminum core cross-linked polyethylene insulated overhead cable according to claim 1, characterized in that, The insulating layer (4) comprises a one-step silane cross-linked polyethylene insulating layer.

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