Single-core anti-vortex aluminum tape armored medium-voltage cable

Abstract

The utility model discloses a single-core anti-vortex aluminum tape armored medium-voltage cable, which comprises a conductor. The conductor shielding layer is coated on the outer surface of the conductor; the insulating layer is coated outside the conductor shielding layer; the insulating shielding layer is coated outside the insulating layer; the metal shielding layer is coated outside the insulation shielding layer; the isolating layer is coated outside the metal shielding layer; a non-magnetic aluminum strip is adopted and spirally wound in a gap wrapping mode (the gap width is 10%-30% of the width of the aluminum strip), meanwhile, through the design that two adjacent layers of aluminum strips are covered in a staggered mode, a closed magnetic loop is effectively cut off, the surface of the aluminum strip is coated with a nanometer aluminum oxide coating, the corrosion resistance is improved by 50% or above (the salt spray test is larger than or equal to 2000 h), and the service life of the aluminum strip is prolonged. The isolating layer is wrapped by a double-layer water-blocking tape and filled with water-blocking glue, gaps of the aluminum tape are filled with water-blocking yarn or water-blocking powder, multiple water-blocking barriers are formed, a ceramic silicone rubber buffer layer (the fire-resistant temperature is larger than or equal to 1000 DEG C) is additionally arranged between the metal shielding layer and the aluminum tape armor layer, the ceramic silicone rubber buffer layer can be ceramized to form a heat-insulating barrier when a fire occurs, and the fire-resistant time is larger than or equal to 90 min.

Description

Technical Field

[0001] This utility model relates to the field of power cable technology, specifically a single-core aluminum tape armored cable suitable for medium-voltage power transmission and with anti-eddy current characteristics. Background Technology

[0002] Traditional single-core armored cables, during operation, experience eddy currents induced in the metal armor layer by the magnetic field generated by alternating current. This leads to cable overheating, reduced transmission efficiency, and even safety hazards. Current solutions often employ phase-separated shielding or non-magnetic armor materials, but these suffer from high cost, complex manufacturing processes, or insufficient mechanical strength. For example, while stainless steel tape is non-magnetic, it is expensive and difficult to process; and ordinary aluminum tape armor, if not properly designed, can still cause eddy currents due to a closed magnetic circuit. Therefore, there is an urgent need for a single-core armored cable structure that combines eddy current prevention, low cost, and high mechanical strength. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, one of the objectives of this utility model is to provide a single-core anti-eddy current aluminum tape armored medium voltage cable.

[0004] One of the objectives of this utility model is achieved through the following technical solution:

[0005] A single-core anti-eddy current aluminum tape armored medium-voltage cable, comprising a conductor;

[0006] A conductor shielding layer covering the outer surface of a conductor;

[0007] An insulating layer covering the conductor shielding layer;

[0008] An insulating shielding layer that covers the insulating layer;

[0009] A metal shielding layer covering the insulating shielding layer;

[0010] An isolation layer covering the metal shielding layer;

[0011] An aluminum strip armor layer covering the outer layer is formed by spirally winding non-magnetic aluminum strips in a gap-wrapping manner, with the gaps between adjacent aluminum strip layers being staggered and overlapping.

[0012] The outer sheath covering the aluminum strip armor layer.

[0013] Furthermore, the gap width of the aluminum strip armor layer is 10%-30% of the width of the aluminum strip; the purity of the aluminum strip is ≥99.6%, and the thickness is 0.2-0.5mm.

[0014] Furthermore, the isolation layer is composed of two layers of water-blocking tape wrapped around it, with water-blocking adhesive filling the gaps between the layers; the gaps in the aluminum strip armor layer are filled with water-blocking yarn or water-blocking powder.

[0015] Furthermore, the metal shielding layer is composed of loosely wound copper wire or copper strip with a cross-sectional area of ​​not less than 16 mm².

[0016] Furthermore, the conductor is a multi-strand annealed copper or aluminum wire stranded structure with a circular or fan-shaped cross-section.

[0017] Furthermore, a ceramicized silicone rubber buffer layer is provided between the aluminum strip armor layer and the metal shielding layer, and the fire resistance temperature of the buffer layer is ≥1000℃.

[0018] Furthermore, the surface of the aluminum strip armor layer is coated with a nano-alumina coating.

[0019] Furthermore, the outer sheath is made of high-density polyethylene or polyvinyl chloride, with UV-resistant textures embossed on its surface.

[0020] Furthermore, the conductor shielding layer and the insulating shielding layer are made of semi-conductive materials, each with a thickness of 0.5-1.0 mm.

[0021] Furthermore, the insulation layer is made of cross-linked polyethylene with a thickness of 4.5-10.5 mm, specifically set according to the 10kV or 35kV voltage level.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] 1. By using non-magnetic aluminum strip (purity ≥99.6%) and spirally winding it with gaps (gap width is 10%-30% of the aluminum strip width), and by designing the staggered coverage of adjacent two layers of aluminum strip, the closed magnetic circuit is effectively cut off.

[0024] 2. The gap wrapping structure of the aluminum strip armor layer combined with the staggered covering process forms a three-dimensional mesh support with a compressive strength ≥40kN / m (tested according to GB / T 2952), which can withstand the soil pressure and mechanical impact during direct burial.

[0025] The aluminum strip surface is coated with a nano-alumina coating, which improves corrosion resistance by more than 50% (salt spray test ≥2000h).

[0026] 3. The isolation layer is wrapped with double-layer water-blocking tape and filled with water-blocking adhesive. The gaps between the aluminum strips are filled with water-blocking yarn or water-blocking powder to form multiple water-blocking barriers.

[0027] Performance verification: Passed the longitudinal water resistance test (1m water head, 72h no leakage) specified in IEC 60502-2 standard.

[0028] 4. A ceramicized silicone rubber buffer layer (fire resistance temperature ≥1000℃) is added between the metal shielding layer and the aluminum strip armor layer. When exposed to fire, it can be ceramicized to form a heat insulation barrier with a fire resistance time ≥90min (tested according to GB / T 19216.21).

[0029] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of this embodiment;

[0031] In the diagram: 1. Conductor; 2. Conductor shielding layer; 3. Insulation layer; 4. Insulation shielding layer; 5. Metal shielding layer; 6. Isolation layer; 7. Aluminum strip armor layer; 8. Outer sheath. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0033] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] Please refer to the figure. The single-core anti-eddy current aluminum tape armored medium voltage cable of this embodiment includes conductor 1;

[0036] Conductor shielding layer 2 covering the outer surface of conductor 1;

[0037] Insulating layer 3 covering the conductor shielding layer 2;

[0038] An insulating shielding layer 4 covering the insulating layer 3;

[0039] A metal shielding layer 5 covering the insulating shielding layer 4;

[0040] An isolation layer 6 covering the metal shielding layer 5;

[0041] An aluminum strip armor layer 7 is wrapped around the isolation layer 6. The aluminum strip armor layer 7 is formed by spirally winding non-magnetic aluminum strips in a gap-wrapping manner, with the gaps between adjacent aluminum strips being staggered and covered.

[0042] The outer sheath 8 covers the aluminum strip armor layer 7.

[0043] The gap width of the aluminum strip armor layer 7 is 10%-30% of the aluminum strip width; the purity of the aluminum strip is ≥99.6%, and the thickness is 0.2-0.5mm. The isolation layer 6 is composed of double-layer water-blocking tape wrapped around the layers, with water-blocking adhesive filling the gaps between the layers. Water-blocking yarn or water-blocking powder is filled in the gaps of the aluminum strip armor layer 7. The metal shielding layer 5 is composed of loosely wound copper wire or copper strip, with a cross-sectional area of ​​not less than 16mm². The conductor 1 is a multi-strand annealed copper wire or aluminum wire stranded structure, with a circular or fan-shaped cross-section. The aluminum strip armor layer 7 and the metal shielding layer 5 are connected. A ceramicized silicone rubber buffer layer is provided between the shielding layers 5. The fire resistance temperature of the buffer layer is ≥1000℃. The surface of the aluminum strip armor layer 7 is coated with a nano-alumina coating. The outer sheath 8 is made of high-density polyethylene or polyvinyl chloride with UV-resistant textures embossed on the surface. The conductor shielding layer 2 and the insulating shielding layer 4 are semi-conductive materials with a thickness of 0.5-1.0mm. The insulating layer 3 is made of cross-linked polyethylene with a thickness of 4.5-10.5mm, depending on the 10kV or 35kV voltage level.

[0044] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A single-core anti-eddy current aluminum tape armored medium-voltage cable, comprising a conductor (1); characterized in that: Conductor shielding layer (2) covering the outer surface of conductor (1); An insulating layer (3) covering the conductor shielding layer (2); An insulating shielding layer (4) is wrapped around the insulating layer (3); A metal shielding layer (5) covering the insulating shielding layer (4); An isolation layer (6) covering the metal shielding layer (5); An aluminum strip armor layer (7) is wrapped around the isolation layer (6). The aluminum strip armor layer (7) is formed by spirally winding non-magnetic aluminum strips in a gap-wrapping manner, with the gaps between adjacent aluminum strips being staggered and covered. The outer sheath (8) covers the aluminum strip armor layer (7).

2. The single-core anti-eddy current aluminum tape armored medium-voltage cable according to claim 1, characterized in that: The gap width of the aluminum strip armor layer (7) is 10%-30% of the width of the aluminum strip; the purity of the aluminum strip is ≥99.6% and the thickness is 0.2-0.5mm.

3. A single-core anti-eddy current aluminum tape armored medium-voltage cable according to claim 1, characterized in that: The isolation layer (6) is composed of double-layer water-blocking tape wrapped around the layers, with water-blocking adhesive filling the gaps between the layers; the gaps in the aluminum strip armor layer (7) are filled with water-blocking yarn or water-blocking powder.

4. A single-core anti-eddy current aluminum tape armored medium-voltage cable according to claim 1, characterized in that: The metal shielding layer (5) is composed of loosely wound copper wire or copper strip, with a cross-sectional area of ​​not less than 16 mm².

5. A single-core anti-eddy current aluminum tape armored medium-voltage cable according to claim 1, characterized in that: The conductor (1) is a multi-strand annealed copper or aluminum wire stranded structure with a circular or fan-shaped cross-section.

6. A single-core anti-eddy current aluminum tape armored medium-voltage cable according to claim 1, characterized in that: A ceramicized silicone rubber buffer layer is provided between the aluminum strip armor layer (7) and the metal shielding layer (5), and the fire resistance temperature of the buffer layer is ≥1000℃.

7. A single-core anti-eddy current aluminum tape armored medium-voltage cable according to claim 1, characterized in that: The surface of the aluminum strip armor layer (7) is coated with a nano-alumina coating.

8. A single-core anti-eddy current aluminum tape armored medium-voltage cable according to claim 1, characterized in that: The outer sheath (8) is made of high-density polyethylene or polyvinyl chloride, with UV-resistant textures embossed on the surface.

9. A single-core anti-eddy current aluminum tape armored medium-voltage cable according to claim 1, characterized in that: The conductor shielding layer (2) and the insulating shielding layer (4) are made of semi-conductive materials, and both have a thickness of 0.5-1.0 mm.

10. A single-core anti-eddy current aluminum tape armored medium-voltage cable according to claim 1, characterized in that: The insulation layer (3) is made of cross-linked polyethylene with a thickness of 4.5-10.5mm, depending on the voltage level of 10kV or 35kV.

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