Corrosion-resistant and distortion-resistant power cable and power transmission system

Abstract

The utility model discloses a corrosion-resistant distortion-resistant power cable and a power transmission system, and the cable comprises a conductor, a first wrapping tape layer disposed outside the conductor, a co-extrusion insulating layer disposed outside the first wrapping tape layer, a second wrapping tape layer disposed outside the co-extrusion insulating layer, a braided shielding layer disposed outside the second wrapping tape layer, and a flame-retardant wrapping tape layer disposed outside the braided shielding layer. And an outer sheath is arranged outside the flame-retardant belting layer. The cable has the properties of low temperature resistance, salt mist resistance, ozone resistance, ultraviolet resistance, oil resistance, weather resistance, distortion resistance, flame retardance and the like, and can effectively meet the use requirements of an offshore wind power environment.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a corrosion-resistant and twisting-resistant power cable and a power transmission system. Background Art

[0002] The rapid development of the wind power industry has led to a demand for cables for wind power generation. For example, soft wires, control cables, and data cables used in the cabin; wiring cables and twist-resistant power cables used in the tower. Due to the harsh environment of wind farms, wind turbines have a long service life, and some cables need to rotate continuously with the wind turbines, which places high demands on the performance of the cables.

[0003] Due to the special use environment of wind farms, very high requirements are placed on them. When selecting cables, full consideration must be given to the natural climate conditions, topography, and regional characteristics of the project site, such as high and low temperature environments, wind farm tower vibrations, flame retardancy, and economic applicability. Current cables are either flame retardant or have torsion resistance and wear resistance, but they cannot have good torsion resistance on top of flame retardancy. Utility Model Content

[0004] In order to solve the above problems, the utility model proposes a corrosion-resistant and torsion-resistant power cable and a power transmission system, which has the properties of low temperature resistance, salt spray resistance, ozone resistance, UV resistance, oil resistance, weather resistance, torsion resistance, flame retardancy, etc., and can effectively meet the use requirements of offshore wind power environment.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] In the first aspect, a corrosion-resistant and torsion-resistant power cable is proposed, including a conductor, a first tape layer is arranged on the outside of the conductor, a co-extruded insulation layer is arranged on the outside of the first tape layer, a second tape layer is arranged on the outside of the co-extruded insulation layer, a braided shielding layer is arranged on the outside of the second tape layer, a flame-retardant tape layer is arranged on the outside of the braided shielding layer, and an outer sheath is arranged on the outside of the flame-retardant tape layer.

[0007] Furthermore, the conductor is formed by twisting a plurality of tinned copper wires.

[0008] Furthermore, the first tape layer is wrapped around the conductor using a semi-conductive tape;

[0009] The second wrapping tape layer is wrapped around the outside of the co-extruded insulation layer with a semi-conductive wrapping tape.

[0010] Furthermore, the thickness of the first tape layer is greater than or equal to 0.1 mm and less than or equal to 0.14 mm;

[0011] The thickness of the second tape layer is greater than or equal to 0.1 mm and less than or equal to 0.14 mm.

[0012] Furthermore, the co-extruded insulating layer includes a conductor semi-conductive shielding layer arranged outside the first wrapping layer, an insulating layer arranged outside the conductor semi-conductive shielding layer, and an insulating semi-conductive shielding layer arranged outside the insulating layer.

[0013] Furthermore, the conductor semi-conductive shielding layer and the insulating semi-conductive shielding layer are both semi-conductive EPDM rubber layers, and the insulating layer is an EPDM rubber insulating layer.

[0014] Furthermore, the braided shielding layer adopts a mixed braiding structure of tinned copper wire and polyester wire.

[0015] Furthermore, the flame retardant tape layer is made of flame retardant glass cloth tape wrapped around the outside of the braided shielding layer.

[0016] Furthermore, the outer sheath is a chlorinated polyethylene sheath.

[0017] In a second aspect, a power transmission system is proposed, comprising the corrosion-resistant and torsion-resistant power cable proposed in the first aspect.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. The utility model proposes a corrosion-resistant and torsion-resistant power cable, which has good bending performance by arranging a first tape layer and a second tape layer, has good flame retardant performance by arranging a flame retardant tape layer, and has good resistance to heat oxygen aging, ozone aging, acid and alkali resistance and oil resistance by arranging an outer sheath.

[0020] 2. The co-extruded insulation layer of the utility model adopts three-layer co-extruded insulation technology, which improves the insulation of the cable, ensures reliable electrical performance, excellent heat aging resistance, excellent cold resistance, ozone resistance, and weather resistance, and is more stable during use.

[0021] 3. The conductor of the utility model is a stranded soft tinned copper wire conductor with good softness.

[0022] 4. The conductor semi-conductive shielding layer and the insulating semi-conductive shielding layer of the utility model are both semi-conductive EPDM rubber layers, and the insulating layer is an EPDM rubber insulating layer. The thermal aging performance of the semi-conductive EPDM rubber mixture is equivalent to that of the insulating layer, and it plays a role of uniform electric field to prevent the formation of gaps between the insulating layer and the conductor, and between the insulating layer and the braided shielding layer to cause local discharge. The insulating EPDM rubber mixture has good chemical stability, excellent heat aging resistance, excellent cold resistance, outstanding electrical insulation performance, ozone resistance, weather resistance, and is non-toxic and odorless.

[0023] 5. The utility model wraps a flame-retardant tape layer around the outside of the braided shielding layer. The flame-retardant tape layer adopts a flame-retardant glass cloth tape. When the material burns at 200-600°C, it can absorb a large amount of heat, prevent the flame from spreading, and protect the insulation layer. The amount of smoke generated during passive combustion is small, and the visibility is good, which greatly reduces the risk of fire and reduces environmental pollution. It does not absorb water and can prevent moisture from invading the insulation layer during storage and operation of the cable.

[0024] Advantages of additional aspects of the present invention will be partially given in the following description, and partially become apparent from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0026] Figure 1 This is a schematic structural diagram of a corrosion-resistant and torsion-resistant power cable proposed in an embodiment.

[0027] Among them: 1. Conductor; 2. First tape layer; 3. Conductor semi-conductive shielding layer; 4. Insulating layer; 5. Insulating semi-conductive shielding layer; 6. Second tape layer; 7. Braided shielding layer; 8. Flame-retardant tape layer; 9. Outer sheath. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0029] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] Example 1

[0032] In this embodiment, a corrosion-resistant and torsion-resistant power cable is proposed, such as Figure 1As shown, it includes a conductor 1, a first tape layer 2 is arranged outside the conductor 1, a co-extruded insulating layer is arranged outside the first tape layer 2, a second tape layer 6 is arranged outside the co-extruded insulating layer, a braided shielding layer 7 is arranged outside the second tape layer 6, a flame retardant tape layer 8 is arranged outside the braided shielding layer 7, and an outer sheath 9 is arranged outside the flame retardant tape layer 8.

[0033] The present embodiment provides a corrosion-resistant and torsion-resistant power cable, which includes a conductor 1 formed by twisting a plurality of tinned copper wires.

[0034] In order to achieve the flexibility of the cable structure, the fifth type of tinned soft copper conductor required by DIN VDE 0295 / IEC 60228 standard is selected, and the bundle twisting and double twisting structure are adopted when twisting to ensure the mechanical properties. The cable conductor should be heated in advance when in use.

[0035] The first tape layer 2 is wrapped around the outside of the conductor with a semi-conductive tape. The semi-conductive tape is wrapped around the outer wall of the conductor 1, and the thickness of the first tape layer 2 is limited to be greater than or equal to 0.1mm and less than or equal to 0.14mm, so as to ensure the bending performance of the cable.

[0036] In this embodiment, a corrosion-resistant and torsion-resistant power cable is proposed, in which a co-extruded insulation layer arranged outside the first wrapping layer 2 includes three layers, and the co-extruded insulation layer includes a conductor semi-conductive shielding layer 3 arranged outside the first wrapping layer 2, an insulating layer 4 arranged outside the conductor semi-conductive shielding layer 3, and an insulating semi-conductive shielding layer 5 arranged outside the insulating layer 4.

[0037] Preferably, the conductor semiconductive shielding layer 3 and the insulating semiconductive shielding layer 5 are both semiconductive EPDM rubber layers, and the insulating layer 4 is an EPDM rubber insulating layer.

[0038] The semi-conductive EPDM rubber layer adopts a semi-conductive material of an EPDM rubber mixture, and the thermal aging performance of the semi-conductive material of the EPDM rubber mixture is equivalent to that of the combined insulating layer 4, which plays a role of uniform electric field to prevent local discharge caused by gaps between the insulating layer and the conductor, and between the insulating layer and the metal shield.

[0039] The EPDM rubber insulation layer adopts an insulating EPDM rubber mixture, which has good chemical stability, excellent heat aging resistance, excellent cold resistance, excellent electrical insulation performance, ozone resistance, weather resistance, and is non-toxic and odorless.

[0040] The conductor semi-conductive shielding layer 3, the insulating layer 4 and the insulating semi-conductive shielding layer 5 are processed by a three-layer co-extrusion process, which has high efficiency and low energy consumption, and avoids the defects of delamination, wrinkling, degumming between the inner and outer shielding and the insulating layer, and the loose bonding between the wire core and the insulation.

[0041] A second wrapping layer 6 is arranged outside the insulating semi-conductive shielding layer 5, wherein the second wrapping layer 6 is wrapped around the outside of the co-extruded insulating layer with a semi-conductive tape, and the semi-conductive tape is wrapped after the co-extruded insulating layer, and the thickness of the second wrapping layer 6 is limited to be greater than or equal to 0.1 mm and less than or equal to 0.14 mm, which can prevent the insulating semi-conductive shielding layer 5 from being pierced by the braided shielding layer 7, thereby ensuring the bending performance of the cable.

[0042] The braided shielding layer 7 adopts a mixed braided structure of tinned copper wires and polyester wires, and the number of tinned copper wires and polyester wires is the same but in opposite directions, so as to improve its torsion resistance.

[0043] A flame retardant tape layer 8 is wrapped around the outside of the braided shielding layer 7. The flame retardant tape layer 8 is wrapped around the outside of the braided shielding layer with a flame retardant glass cloth tape. The flame retardant glass can absorb a large amount of heat when burned at 200-600°C, prevent the spread of flames, and protect the insulation layer; the amount of smoke generated during passive combustion is small, and visibility is good, which greatly reduces the risk of fire and reduces environmental pollution; it does not absorb water and can prevent moisture from invading the insulation layer during storage and operation of the cable.

[0044] An outer sheath 9 is extruded outside the flame retardant tape layer 8. The outer sheath 9 is a chlorinated polyethylene sheath. The material has excellent resistance to heat and oxygen aging, ozone aging, acid and alkali resistance, and oil resistance.

[0045] The present embodiment proposes a corrosion-resistant and torsion-resistant power cable with a rated voltage of 26 / 35kV, a compact structure, good stability, good flame retardancy, low temperature resistance, salt spray resistance, ozone resistance, UV resistance, oil resistance, weather resistance, and torsion resistance. It can effectively meet the use environment requirements of corrosion-resistant and torsion-resistant power cables for offshore wind power with a rated voltage of 26 / 35kV.

[0046] Example 2

[0047] In this embodiment, a power transmission system is proposed, including the corrosion-resistant and torsion-resistant power cable proposed in Embodiment 1.

[0048] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0049] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A corrosion-resistant and torsion-resistant power cable, characterized in that: It comprises a conductor, a first tape layer is arranged outside the conductor, a co-extruded insulating layer is arranged outside the first tape layer, a second tape layer is arranged outside the co-extruded insulating layer, a braided shielding layer is arranged outside the second tape layer, a flame-retardant tape layer is arranged outside the braided shielding layer, and an outer sheath is arranged outside the flame-retardant tape layer; The co-extruded insulating layer comprises a conductor semi-conductive shielding layer arranged outside the first wrapping layer, an insulating layer arranged outside the conductor semi-conductive shielding layer, and an insulating semi-conductive shielding layer arranged outside the insulating layer.

2. A corrosion-resistant and torsion-resistant power cable as claimed in claim 1, characterized in that: The conductor is made of multiple tinned copper wires twisted together.

3. A corrosion-resistant and torsion-resistant power cable according to claim 1, characterized in that: The first tape layer is a semi-conductive tape wrapped around the outside of the conductor; The second wrapping tape layer is wrapped around the outside of the co-extruded insulation layer with a semi-conductive wrapping tape.

4. A corrosion-resistant and torsion-resistant power cable according to claim 1, characterized in that: The thickness of the first tape layer is greater than or equal to 0.1 mm and less than or equal to 0.14 mm; The thickness of the second tape layer is greater than or equal to 0.1 mm and less than or equal to 0.14 mm.

5. The corrosion-resistant and torsion-resistant power cable according to claim 1, characterized in that: The conductor semi-conductive shielding layer and the insulating semi-conductive shielding layer are both semi-conductive EPDM rubber layers, and the insulating layer is an EPDM rubber insulating layer.

6. The corrosion-resistant and torsion-resistant power cable according to claim 1, characterized in that: The braided shield layer adopts a mixed braided structure of tinned copper wire and polyester wire.

7. The corrosion-resistant and torsion-resistant power cable according to claim 1, characterized in that: The flame retardant tape layer is made of flame retardant glass cloth tape wrapped around the outside of the braided shielding layer.

8. The corrosion-resistant and torsion-resistant power cable according to claim 1, characterized in that: The outer sheath is chlorinated polyethylene sheath.

9. A power transmission system, characterized in that: A corrosion-resistant and torsion-resistant power cable comprising the method described in any one of claims 1 to 8.

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