Low-voltage aluminum alloy cable for wind power tower drum

Abstract

The utility model discloses a low-voltage aluminum alloy cable for a wind power tower drum, which comprises an aluminum alloy conductor, an aluminum pipe is concentrically, coaxially and tightly sleeved on the outer side of the aluminum alloy conductor, an insulating layer is concentrically, coaxially and tightly sleeved on the outer side of the aluminum pipe, a flame-retardant belting layer is concentrically, coaxially and tightly sleeved on the outer side of the insulating layer, and the flame-retardant belting layer is wrapped on the outer side of the aluminum pipe. The outer side of the flame-retardant belting layer is concentrically, coaxially and tightly sleeved with the flame-retardant sheath layer, pure copper or pure aluminum of the conductor is replaced by aluminum alloy, the cost is reduced while the performance is ensured, and the applicability and quality of the cable are ensured by taking the aluminum pipe as primary protection and utilizing the characteristics of high strength, good flexibility, small bending radius, nonmagnetism and the like of the aluminum pipe.

Description

Technical Field

[0001] This utility model relates to the field of cable manufacturing technology, and in particular to low-voltage aluminum alloy cables for wind turbine towers. Background Technology

[0002] Power cables are a crucial component of wind farm power collection lines. Typically, wind farm cables use either aluminum or copper core conductors. Both aluminum and copper core cables have their drawbacks. Aluminum core cables suffer from poor flexibility, making them prone to breakage from repeated bending; lower stability, making them susceptible to corrosion and oxidation; higher resistivity, resulting in higher energy consumption and losses compared to copper core cables of the same cross-section; and poor ductility, making installation inconvenient. Copper core cables, on the other hand, are more expensive; heavier; and have higher construction and transportation costs.

[0003] The technical requirements for aluminum alloy cables specifically designed for wind turbine towers mainly include three aspects.

[0004] First, since the cable is fixedly laid inside the wind turbine tower and needs to be used in a long-term vibration environment, the problem of long-term vibration fatigue damage of the cable assembly must be solved. Therefore, the cable should have long-term vibration fatigue resistance within its 25-year design life.

[0005] Secondly, since wind power transmission cables are laid centrally inside towers, in order to meet environmental protection and safety requirements, the cables must have low smoke and halogen-free properties, low toxicity, high light transmittance, and excellent flame retardant and non-flame-prolonging properties.

[0006] Finally, and most importantly, as the carrier of current, the cable is responsible for collecting and transmitting the electrical energy generated by wind power. It should have good and safe electrical performance to ensure that the wind power system can operate normally and safely in various harsh environments.

[0007] Existing copper-core and aluminum-core cables do not fully meet the technical requirements of aluminum alloy cables specifically designed for wind turbine towers during use. Utility Model Content

[0008] This utility model provides a low-voltage aluminum alloy cable for wind turbine towers, aiming to solve the problems of high cost of existing pure copper cores, easy breakage of pure aluminum cores due to repeated bending, poor stability and high loss, and the inability of pure copper or pure aluminum cores to meet the technical requirements for special cables for wind turbine towers.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0010] A low-voltage aluminum alloy cable for wind turbine towers includes an aluminum alloy conductor, an aluminum tube tightly fitted concentrically and coaxially on the outside of the aluminum alloy conductor, an insulation layer tightly fitted concentrically and coaxially on the outside of the aluminum tube, a flame-retardant wrapping layer tightly fitted concentrically and coaxially on the outside of the insulation layer, and a flame-retardant sheath layer tightly fitted concentrically and coaxially on the outside of the flame-retardant wrapping layer.

[0011] Preferably, the aluminum alloy conductor has a concentric stranded structure.

[0012] Preferably, the aluminum tube has no seamless sides, and the aluminum alloy conductor is sealed and embedded inside the aluminum tube.

[0013] More preferably, an oxygen barrier layer is provided between the aluminum alloy conductor and the aluminum tube, and the aluminum alloy conductor and the aluminum tube form a sealed fit through the oxygen barrier layer.

[0014] Furthermore, the oxygen barrier layer is a fire-resistant mica tape.

[0015] Preferably, the insulating layer is a cross-linked polyethylene insulating sleeve.

[0016] Preferably, the flame-retardant wrapping layer is a low-smoke halogen-free polyolefin flame-retardant wrapping layer.

[0017] Preferably, the flame-retardant sheath layer is a low-smoke, halogen-free polyolefin flame-retardant sheath.

[0018] The beneficial effects of this utility model are:

[0019] The cable uses aluminum alloy conductors as the core, which reduces costs while improving the cable's flexibility, stability, and ductility, and also reduces resistivity. Secondly, the aluminum tube enhances the cable's protection and roundness, and the flame-retardant wrapping layer and flame-retardant sheath layer ensure that the cable as a whole meets the technical requirements for aluminum alloy cables for wind power towers. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the cable cross-section of this utility model;

[0021] In the diagram: 1. Aluminum alloy conductor; 2. Aluminum tube; 3. Insulation layer; 4. Flame-retardant wrapping layer; 5. Flame-retardant sheath layer; 6. Oxygen barrier layer. Detailed Implementation

[0022] The embodiments will be further described below with reference to the accompanying drawings.

[0023] like Figure 1As shown in the preferred embodiment 1, the low-voltage aluminum alloy cable for wind turbine towers includes an aluminum alloy conductor 1, an aluminum tube 2 tightly fitted on the outer side of the aluminum alloy conductor 1 in a coaxial manner, an insulation layer 3 tightly fitted on the outer side of the aluminum tube 2 in a coaxial manner, a flame-retardant wrapping layer 4 tightly fitted on the outer side of the insulation layer 3 in a coaxial manner, and a flame-retardant sheath layer 5 tightly fitted on the outer side of the flame-retardant wrapping layer 4 in a coaxial manner.

[0024] Preferably, the aluminum alloy conductor 1 can be an AA8030 aluminum alloy conductor, and its performance comparison with that of the copper conductor is shown in Table 1.

[0025]

[0026] Table 1

[0027] In a preferred embodiment 2, the aluminum alloy conductor 1 has a concentric stranded wire structure. Considering factors such as conductor outer diameter, conductor flexibility, contact resistance between conductor filaments, surface smoothness, and conductor tightness, a concentric stranded wire structure is selected. Compared to compacted and single-wire structures, the concentric stranded wire structure has a higher conductor cross-sectional area utilization rate, reducing the diameter by approximately 10% for the same cross-sectional area; and increasing the conductor cross-sectional area by 20% to 25% for the same diameter.

[0028] As a preferred embodiment 3, the aluminum tube 2 has no seamless sides, and the aluminum alloy conductor 1 is sealed and embedded inside the aluminum tube 2, ensuring a protective effect.

[0029] An oxygen barrier layer 6 is provided between the aluminum alloy conductor 1 and the aluminum tube 2, and the aluminum alloy conductor 1 and the aluminum tube 2 form a sealed fit through the oxygen barrier layer 6.

[0030] The oxygen barrier layer 6 is made of fire-resistant mica tape. It ensures a tight seal and protective effect while preventing any impact on the cable's properties, thus ensuring it meets the technical requirements for use.

[0031] In a preferred embodiment 4, the insulation layer 3 is a cross-linked polyethylene insulation sheath. This is to ensure the cable possesses excellent flame-retardant and non-flame-prolonging properties, while also meeting environmental and safety requirements such as low smoke, halogen-free, low toxicity, and high light transmittance.

[0032] As a preferred embodiment 5, the flame-retardant wrapping layer 4 is a low-smoke halogen-free polyolefin flame-retardant wrapping layer. This is to ensure the cable possesses excellent flame-retardant and non-flame-prolonging properties, while simultaneously meeting environmental and safety requirements such as low smoke halogen-free, low toxicity, and high light transmittance.

[0033] In a preferred embodiment 6, the flame-retardant sheath layer 5 is a low-smoke halogen-free polyolefin flame-retardant sheath. This is to ensure the cable possesses excellent flame-retardant and non-flame-prolonging properties, while simultaneously meeting environmental and safety requirements such as low smoke halogen-free, low toxicity, and high light transmittance.

[0034] The working principle of this utility model:

[0035] The cable provided by this utility model uses an aluminum alloy conductor as the core, which reduces costs while improving the cable's flexibility, stability, and ductility, and also reduces resistivity. Secondly, the aluminum tube enhances the cable's protective effect and roundness, and the flame-retardant wrapping layer and flame-retardant sheath layer ensure that the cable as a whole meets the technical requirements for aluminum alloy cables for wind power towers.

Claims

1. A low-voltage aluminum alloy cable for wind turbine towers, characterized in that, It includes an aluminum alloy conductor (1), an aluminum tube (2) is tightly fitted on the outside of the aluminum alloy conductor (1) in a coaxial manner, an insulation layer (3) is tightly fitted on the outside of the aluminum tube (2) in a coaxial manner, a flame-retardant wrapping layer (4) is tightly fitted on the outside of the insulation layer (3) in a coaxial manner, and a flame-retardant sheath layer (5) is tightly fitted on the outside of the flame-retardant wrapping layer (4) in a coaxial manner.

2. The low-voltage aluminum alloy cable for wind turbine towers according to claim 1, characterized in that, The aluminum alloy conductor (1) has a concentric stranded structure.

3. The low-voltage aluminum alloy cable for wind turbine towers according to claim 1, characterized in that, The aluminum tube (2) is seamless on the side, and the aluminum alloy conductor (1) is sealed and embedded inside the aluminum tube (2).

4. The low-voltage aluminum alloy cable for wind turbine towers according to claim 3, characterized in that, An oxygen barrier layer (6) is provided between the aluminum alloy conductor (1) and the aluminum tube (2), and the aluminum alloy conductor (1) forms a sealed fit with the aluminum tube (2) through the oxygen barrier layer (6).

5. The low-voltage aluminum alloy cable for wind turbine towers according to claim 4, characterized in that, The oxygen barrier layer (6) is a fire-resistant mica tape.

6. The low-voltage aluminum alloy cable for wind turbine towers according to claim 1, characterized in that, The insulating layer (3) is a cross-linked polyethylene insulating sleeve.

7. The low-voltage aluminum alloy cable for wind turbine towers according to claim 1, characterized in that, The flame-retardant wrapping layer (4) is a low-smoke halogen-free polyolefin flame-retardant wrapping layer.

8. The low-voltage aluminum alloy cable for wind turbine towers according to claim 1, characterized in that, The flame-retardant sheath layer (5) is a low-smoke halogen-free polyolefin flame-retardant sheath.

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