Power cable for wind power generation

Abstract

The utility model discloses a power cable for wind power generation, which comprises a cable core, the cable core is formed by twisting a plurality of power line conductors and a plurality of ground wire conductors, a central nylon rope is arranged among the plurality of power line conductors, and the cable core is formed by twisting the plurality of power line conductors and the ground wire conductors with the central nylon rope; a wrapping tape layer, an inner sheath layer, a reinforced braid layer and an outer sheath layer are sequentially arranged on the outer side of the cable core from inside to outside, and a filling layer is arranged between the power line conductors and the ground line conductors in the wrapping tape layer. According to the power cable provided by the utility model, through cooperative use of the structural layers, the cable not only has excellent distortion-resistant and tensile properties, but also has good cold-resistant, flame-retardant and wear-resistant properties, so that the service life of the cable is prolonged, the use requirements of outdoor wind power generation can be met, and the power cable is high in practicability, simple in overall structure and convenient to popularize and use. The design is reasonable, and popularization and use are worthy.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of power cable, specifically to a power cable for wind power generation. BACKGROUND

[0002] Wind energy is a clean and renewable resource. Wind power generation is a clean energy production method that captures wind power and converts it into electricity, making an important contribution to sustainable energy supply. The cable for wind power has a relatively harsh environment. The traditional cable for wind power generation generally uses rubber materials. Rubber needs to be vulcanized in the production process. The vulcanization process determines the performance of the material. It is difficult to control the vulcanization process during the extrusion production process. If a conventional PVC sheath is used, the sheath will harden at minus 40 degrees Celsius. The cable will break after twisting. Without the sheath, the inner core will be completely broken under stress. Due to the harsh conditions of the cable for wind power generation, the cable must withstand rain, snow and cold during operation. In low temperature conditions, the use of conventional cables can easily cause cracking, making it difficult to ensure normal operation of the cable.

[0003] Most of the cables used in the existing market use copper cores as conductors. Due to the high cost, heavy weight and resource shortage of copper, not only does it increase the processing cost of enterprises, but also increases the use cost of users. Compared with copper, aluminum is much lighter. Replacing copper with aluminum is an inevitable trend in the development of wire and cable. However, ordinary aluminum core cables have poor mechanical properties and poor anti-freezing properties, which can damage the internal core and affect normal use, especially in harsh environments. The insulating layer of the cable is easily damaged by freezing, which exposes the internal cable to the air, easily causing a short circuit in the line, and cannot meet the use requirements. When aluminum alloy is used as the core, it is prone to wire breakage during cable twisting. Therefore, how to solve the problem of wire breakage during cable twisting has become a technical problem that needs to be solved.

[0004] After searching, the patent document with application publication number CN115631884A discloses a tensile and torsion-resistant medium-voltage cable for wind power generators and a preparation method thereof, the patent document with authorization publication number CN221040597U discloses a cold-resistant cable for wind power generation, and the patent document with authorization publication number CN220420285U discloses a cold-resistant and anti-freezing multi-core cable. From the content disclosed in the three patent documents searched, a cable that meets the use requirements is provided from different angles. With the rapid growth of wind power demand, a large amount of cable is needed. In order to enhance the competitiveness of enterprises, meet market demand and improve market share, a cable different from the cables disclosed in the prior art is provided to meet the use requirements. Utility Model Content

[0005] The technical problem to be solved by this utility model is to address the problems existing in the background technology, thereby providing a cable with stable performance. Using this cable, its cold resistance and antifreeze properties can be effectively enhanced, ensuring that the cable can withstand the damage to its internal core caused by rain, snow and cold air during operation, thereby meeting the cable's usage requirements in low-temperature environments and increasing the cable's service life. Specifically, it is a power cable for wind power generation.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a power cable for wind power generation, comprising a cable core, wherein the cable core comprises multiple power conductors and multiple ground conductors twisted together, and a central nylon rope is provided between the multiple power conductors. The cable core is formed by twisting the multiple power conductors and ground conductors together with the central nylon rope. From the inside to the outside, a wrapping layer, an inner sheath layer, a reinforcing braided layer and an outer sheath layer are provided on the outside of the cable core, and a filling layer is provided between the multiple power conductors and ground conductors in the wrapping layer.

[0007] Furthermore, in the wind power cable of this utility model, three power conductors and three ground conductors are respectively provided. The three power conductors are arranged outside the central nylon rope, while the three ground conductors are evenly distributed between adjacent power conductors. The power conductor includes an aluminum alloy power core, and from the inside out, a power inner shielding layer, a power insulation layer, a power insulation shielding layer, a power outer shielding layer, and a power double-sided water-blocking tape layer are arranged on the aluminum alloy power core. The ground conductor includes an aluminum alloy ground core, and from the inside out, a ground insulation layer and a ground double-sided water-blocking tape layer are arranged on the aluminum alloy ground core.

[0008] Furthermore, in the wind power cable of this utility model, both the aluminum alloy power core and the aluminum alloy ground core are formed by twisting together a central unit and six peripheral units. The central unit is formed by twisting a steel wire rope and six Category 5 aluminum alloy strands to the left, with the steel wire rope located at the center of the Category 5 aluminum alloy strands. The peripheral units are formed by twisting eight Category 5 aluminum alloy strands to the left. Each Category 5 aluminum alloy strand is formed by twisting 20 to 30 aluminum alloy monofilaments together to the right.

[0009] Furthermore, in the wind power generation power cable of this utility model, the diameter of the aluminum alloy monofilament is 0.30-0.50 mm; the diameter of the steel wire rope is 1.5-2.5 mm; the pitch ratio of the central unit and the peripheral unit is 12-14 times; and the pitch ratio of the aluminum alloy power core and the aluminum alloy ground core is 10-12 times.

[0010] Furthermore, in the wind power cable of this utility model, the insulation layer of the power line and the insulation layer of the ground wire are both extruded from halogen-free, low-smoke, flame-retardant polyethylene insulation material; the double-sided water-blocking tape layer of the power line and the double-sided water-blocking tape layer of the ground wire are both longitudinally wrapped with water-blocking tape; the inner shielding layer of the power line is wrapped with aluminum-plastic composite tape; the insulation shielding layer of the power line is extruded from peelable semi-conductive insulation shielding material; and the outer shielding layer of the power line is braided from tin-plated copper wire.

[0011] Furthermore, in the wind power cable of this utility model, the filling layer is made of aramid yarn.

[0012] Furthermore, in the wind power cable of this utility model, the wrapping layer is made of non-woven fabric with a wrapping thickness of 0.1-0.2 mm and a wrapping overlap rate of 10-30%.

[0013] Furthermore, in the wind power cable of this utility model, the inner sheath layer is extruded from polyurethane elastomer material.

[0014] Furthermore, in the wind power cable of this utility model, the reinforcing braided layer is made of two layers of galvanized steel strip spirally wrapped.

[0015] Furthermore, in the wind power cable of this utility model, the outer sheath is extruded from a wear-resistant, halogen-free, low-smoke, flame-retardant polyolefin material.

[0016] The wind power cable of this invention features a central nylon rope inside the cable core, surrounded by a wrapping layer, an inner sheath layer, a reinforcing braided layer, and an outer sheath layer. A filling layer is also present within the cable core. Furthermore, the aluminum alloy power conductor and ground conductor are each composed of a central unit and six peripheral units twisted together, with a steel wire rope within the central unit. This reduces the vertical stress on the aluminum alloy conductors. Additionally, using aluminum alloy conductors reduces processing costs while maintaining conductivity. Therefore, the power cable of this invention, through the coordinated use of various structural layers, not only possesses excellent torsional and tensile strength but also good cold resistance, flame retardancy, and abrasion resistance, thereby increasing the cable's service life. It meets the requirements for outdoor wind power generation, demonstrating strong practicality, a simple overall structure, and a reasonable design, making it worthy of widespread adoption. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] The diagram shows: 1-Power conductor, 11-Aluminum alloy power conductor core, 12-Inner shielding layer of power conductor, 13-Insulation layer of power conductor, 14-Insulation and shielding layer of power conductor, 15-Outer shielding layer of power conductor, 16-Double-sided water-blocking tape layer of power conductor, 2-Ground conductor, 21-Aluminum alloy ground conductor core, 22-Ground insulation layer, 23-Double-sided water-blocking tape layer of ground conductor, 3-Center nylon rope, 4-Filling layer, 5-Wrapping tape layer, 6-Inner sheath layer, 7-Reinforced braided layer, 8-Outer sheath layer. Detailed Implementation

[0020] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0021] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," and "right" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "provided with" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] It should be noted that the term "comprising" or any other variation is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] like Figure 1As shown, this utility model provides a power cable for wind power generation, including a cable core. The cable core is composed of multiple power conductors 1 and multiple ground conductors 2 twisted together. A central nylon rope 3 is provided between the multiple power conductors 1. The cable core is formed by twisting the multiple power conductors 1 and ground conductors 2 together with the central nylon rope 3. From the inside to the outside, the cable core is provided with a wrapping layer 5, an inner sheath layer 6, a reinforcing braided layer 7, and an outer sheath layer 8. A filling layer 4 is provided between the multiple power conductors 1 and ground conductors 2 within the wrapping layer 5.

[0025] The system comprises three power conductors 1 and three ground conductors 2. The three power conductors 1 are arranged outside the central nylon rope 3, while the three ground conductors 2 are evenly distributed between adjacent power conductors 1. The power conductor 1 includes an aluminum alloy power core 11, and, from the inside out, a power inner shielding layer 12, a power insulation layer 13, a power insulation shielding layer 14, a power outer shielding layer 15, and a power double-sided water-blocking tape layer 16 arranged on the aluminum alloy power core 11. The ground conductor 2 includes an aluminum alloy ground core 21, and, from the inside out, a ground insulation layer 22 and a ground double-sided water-blocking tape layer 23 arranged on the aluminum alloy ground core 21.

[0026] In the specific manufacturing process, the wind power cable of this utility model is adopted. The aluminum alloy power core 11 and the aluminum alloy ground core 21 are both formed by twisting together a central unit and six peripheral units. The central unit is formed by twisting a steel wire rope and six Category 5 aluminum alloy strands to the left, with the steel wire rope located at the center of the Category 5 aluminum alloy strands. The peripheral units are formed by twisting eight Category 5 aluminum alloy strands to the left. The Category 5 aluminum alloy strands are formed by twisting 25 aluminum alloy monofilaments to the right. The diameter of the aluminum alloy monofilament is 0.40 mm. The diameter of the steel wire rope is 2.0 mm. The pitch ratio of the central unit and the peripheral units is 14 times. The pitch ratio of the aluminum alloy power core 11 and the aluminum alloy ground core 21 is 12 times. The power line insulation layer 13 and the ground line insulation layer 22 are both extruded from halogen-free, low-smoke, flame-retardant polyethylene insulation material; the power line double-sided water-blocking tape layer 16 and the ground line double-sided water-blocking tape layer 23 are both longitudinally wrapped with water-blocking tape; the power line inner shielding layer 12 is wrapped with aluminum-plastic composite tape; the power line insulation shielding layer 14 is extruded from peelable semi-conductive insulation shielding material; and the power line outer shielding layer 15 is woven from tin-plated copper wire.

[0027] Furthermore, in the wind power cable of this invention, the filling layer 4 is made of aramid fiber. Aramid fiber possesses excellent properties such as ultra-high strength, high modulus, high temperature resistance, acid and alkali resistance, and light weight. Its strength is 5-6 times that of steel wire, its modulus is 2-3 times that of steel wire or glass fiber, its toughness is twice that of steel wire, and its weight is only about 1 / 5 of steel wire. It does not decompose or melt at 560 degrees Celsius. It has good insulation and anti-aging properties and a long service life. The wrapping layer 5 is made of non-woven fabric with a wrapping thickness of 0.1 mm and a wrapping overlap rate of 30%. The inner sheath layer 6 is extruded from polyurethane elastomer material. The reinforcing braided layer 7 is spirally wrapped with two layers of galvanized steel strip. The outer sheath layer 8 is extruded from wear-resistant, halogen-free, low-smoke, flame-retardant polyolefin material.

[0028] Therefore, the power cable of this invention, with its power conductor 1 comprising an aluminum alloy power conductor core 11, and sequentially arranged from the inside out of the aluminum alloy power conductor core 11 with an inner power shielding layer 12, a power insulation layer 13, a power insulation shielding layer 14, a power outer shielding layer 15, and a power double-sided water-blocking tape layer 16; and the ground conductor 2 comprising an aluminum alloy ground conductor core 21, and sequentially arranged from the inside out of the aluminum alloy ground conductor core 21 with a ground insulation layer 22 and a ground double-sided water-blocking tape layer 23, achieves both electrical safety and water-blocking properties. Furthermore, the cable core features a central nylon rope 3 inside, and outer layers of wrapping tape 5, inner sheath 6, reinforcing braid 7, and outer sheath 8 outside the core. A filling layer 4 is also present inside the core. Additionally, the aluminum alloy power conductor 11 and ground conductor 21 in both the power conductor 1 and ground conductor 2 are formed by twisting a central unit and six peripheral units, with a steel wire rope within the central unit. This reduces the vertical stress on the aluminum alloy conductor. Moreover, the central unit is formed by left-hand twisting of a steel wire rope and six type 5 aluminum alloy strands, while the peripheral units are formed by left-hand twisting of eight type 5 aluminum alloy strands. These type 5 aluminum alloy strands are formed by right-hand twisting of multiple aluminum alloy monofilaments. These two opposite twisting methods effectively reduce the horizontal torsional stress on the aluminum alloy conductor, ensuring no breakage of the aluminum alloy monofilaments. Furthermore, using aluminum alloy conductors reduces processing costs while maintaining conductivity.

[0029] In summary, the power cable described in this utility model, through the coordinated use of various structural layers, not only possesses excellent torsional and tensile strength, but also exhibits good cold resistance, flame retardancy, and abrasion resistance, thereby increasing the cable's service life. It can meet the needs of outdoor wind power generation, is highly practical, has a simple overall structure, and a reasonable design, making it worthy of widespread use.

[0030] Other aspects of this utility model that are not detailed herein are all conventional techniques known to those skilled in the art.

[0031] The scope of protection of this utility model is not limited to the technical solutions disclosed in the specific embodiments. The above description is only a preferred embodiment of this utility model and does not limit this utility model. Any minor modifications, equivalent substitutions and improvements made based on the technical solutions of this utility model should be included within the scope of protection of the technical solutions of this utility model.

Claims

1. A power cable for wind power generation, comprising a cable core, said cable core being composed of multiple power conductors (1) and multiple ground conductors (2) twisted together, characterized in that: A central nylon rope (3) is provided between multiple power conductors (1), and the cable core is formed by twisting multiple power conductors (1) and ground conductors (2) with the central nylon rope (3); a wrapping layer (5), an inner sheath layer (6), a reinforcing braided layer (7) and an outer sheath layer (8) are provided on the outside of the cable core from the inside to the outside, and a filling layer (4) is provided between multiple power conductors (1) and ground conductors (2) in the wrapping layer (5); The power line conductor (1) includes an aluminum alloy power line core (11), and power line inner shielding layer (12), power line insulation layer (13), power line insulation shielding layer (14), power line outer shielding layer (15) and power line double-sided water-blocking tape layer (16) arranged sequentially from the inside to the outside on the aluminum alloy power line core (11). The ground conductor (2) includes an aluminum alloy ground core (21), and a ground insulation layer (22) and a double-sided water-blocking strip layer (23) arranged sequentially from the inside to the outside on the aluminum alloy ground core (21); the aluminum alloy power core (11) and the aluminum alloy ground core (21) are both formed by twisting together a central unit and six peripheral units, wherein the central unit is formed by twisting together a steel wire rope and six Class 5 aluminum alloy strands in a leftward direction, and the steel wire rope is located in the Class 5 aluminum alloy strands. The core and the outer unit are formed by left-hand twisting of eight type 5 aluminum alloy strands; the type 5 aluminum alloy strands are formed by right-hand twisting of 20-30 aluminum alloy monofilaments; the diameter of the aluminum alloy monofilament is 0.30-0.50 mm; the diameter of the steel wire rope is 1.5-2.5 mm; the pitch ratio of the core unit and the outer unit is 12-14 times; the pitch ratio of the aluminum alloy power core (11) and the aluminum alloy ground core (21) is 10-12 times. The power line insulation layer (13) and the ground wire insulation layer (22) are both extruded from halogen-free, low-smoke, flame-retardant polyethylene insulation material. The power line double-sided water-blocking tape layer (16) and the ground wire double-sided water-blocking tape layer (23) are both longitudinally wrapped with water-blocking tape. The power line inner shielding layer (12) is wrapped with aluminum-plastic composite tape. The power line insulation shielding layer (14) is extruded from peelable semi-conductive insulation shielding material. The power line outer shielding layer (15) is woven from tin-plated copper wire. The filling layer (4) is made of aramid yarn; The wrapping layer (5) is made of non-woven fabric with a wrapping thickness of 0.1-0.2 mm and a wrapping overlap rate of 10-30%. The inner sheath layer (6) is made of polyurethane elastomer material through extrusion. The reinforcing braided layer (7) is made of two layers of galvanized steel strip spirally wrapped together; The outer sheath layer (8) is extruded from a wear-resistant, halogen-free, low-smoke, flame-retardant polyolefin material.

2. The power cable for wind power generation according to claim 1, characterized in that: The power conductor (1) and the ground conductor (2) are each provided with three conductors. The three power conductors (1) are arranged outside the central nylon rope (3), while the three ground conductors (2) are evenly distributed between two adjacent power conductors (1).

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