Corrosion-resistant flexible cable for capacity-increasing offshore wind driven generator

Abstract

The utility model discloses a corrosion-resistant flexible cable for a capacity-increasing offshore wind driven generator. The corrosion-resistant flexible cable comprises a cable core, the cable core is provided with a plurality of power wire cores which are twisted together; each power wire core is formed by twisting a plurality of conductor strands, each conductor strand is formed by bunch-twisting a plurality of soft copper conductors, and the twisting direction of the conductor strands is the same as the bunch-twisting direction of the soft copper conductors; high-temperature-resistant anti-corrosion grease is filled in the twisting gaps of the power wire cores; and an isolating layer is coated outside the stranded structure of the power wire cores. Aiming at the particularity of the working condition environment of the offshore wind driven generator, the soft copper conductors with low resistance and high transmission power form the power wire cores, and the high-temperature-resistant anti-corrosion grease is supplemented for anti-corrosion filling, so that the technical effects of salt mist resistance, corrosion resistance and capacity increase are achieved, the technical requirements of high-power transmission of the offshore wind driven generator are met, and the service life of the offshore wind driven generator is prolonged. And bunch stranding is adopted first and then compound stranding in the same direction is adopted, so that the relative slippage distance between layers is large, and the flexibility is good.

Description

Technical Field

[0001] The utility model relates to a cable, in particular to a corrosion-resistant soft cable for a capacity-increasing offshore wind turbine generator. Background Art

[0002] As a form of clean energy with great potential, offshore wind power technology has attracted widespread attention due to its advantages of being clean, environmentally friendly, resource-rich and with great prospects for utilization.

[0003] With the continuous development of wind power generation technology, the installed capacity of offshore wind turbines is increasing, and their single-unit capacity and output power are also significantly improved. Therefore, power transmission cables with larger transmission capacity are needed to support the power transmission of offshore wind turbines.

[0004] Since offshore wind turbines are located in the marine environment, their supporting power transmission cables also need to serve for a long time in the strong wind, salt spray, acid, alkali, waves and other impact conditions at sea. In order to avoid oxidation reactions in the cores of cables used in offshore wind turbines, tinned copper conductors with good antioxidant properties are usually used as transmission conductors for the power cores. However, due to the technical problem of the large conductor resistivity of tinned copper conductors, compared with soft copper conductor cables of the same specifications, the power transmission power is relatively low, and it is difficult to adapt to the technical requirements of high-power offshore wind turbines. It is easy to generate heat during large-capacity power transmission, and the heat is aggravated with the extension of service time, resulting in poor stability and a short service life.

[0005] In order to improve the transmission capacity of cables used in offshore wind turbines, in the disclosed prior art, soft copper conductors with low conductor resistivity and high transmission power are used as the power core of cables used in offshore wind turbines, such as the technology disclosed in the Chinese patent document entitled "A Salt Spray Resistant Fully Sealed Offshore Wind Turbine Cable", publication number CN 219610054U, and publication date August 29, 2023. However, due to the low oxidation resistance of soft copper conductors, when serving in harsh working conditions at sea, oxidation and corrosion are prone to occur, which will also affect its service stability and life. Utility Model Content

[0006] The technical purpose of the utility model is to provide a salt spray-resistant and corrosion-resistant corrosion-resistant flexible cable for a capacity-increasing offshore wind turbine in view of the particularity of the above-mentioned offshore wind turbine and the shortcomings of the existing cable technology.

[0007] The technical purpose of the utility model is achieved through the following technical scheme: a corrosion-resistant flexible cable for a capacity-increasing offshore wind turbine, comprising a cable core; the cable core has a plurality of power cores twisted together; each power core is formed by twisting a plurality of conductor strands, each conductor strand is formed by twisting a plurality of soft copper conductors, and the twisting direction of the conductor strands is the same as the twisting direction of the soft copper conductors; the twisted gap of the power core is filled with high-temperature resistant anti-corrosion grease; the twisted structure of the power core is coated with an isolation layer.

[0008] The above technical measures are aimed at the particularity of the working environment of offshore wind turbines. The power line core is composed of soft copper conductors with low resistance and high transmission power, and is supplemented with high-temperature resistant anti-corrosion grease for corrosion resistance filling, so as to achieve the technical effects of salt spray resistance, corrosion resistance, and capacity increase, and meet the high-power transmission technology requirements of offshore wind turbines. In addition, the power line core of the above cable core adopts a structure of first bundle twisting and then re-twisting in the same direction, so that the relative slip distance between layers is large, the flexibility is good, and it is conducive to laying and installation.

[0009] The conductor strands of the power line core are formed by twisting a plurality of soft copper conductors with a single wire diameter of 0.30 to 0.50 mm, and the bundle-twisted pitch-diameter ratio of the conductor strands is 16 to 28 times;

[0010] The twisted pitch-diameter ratio of the multiple strands of the power line core is 10 to 13 times.

[0011] The power line core of the above technical measures is formed by twisting a plurality of soft copper conductors, which improves the compactness of the structure of the power line core and its flexibility.

[0012] The soft copper conductor of the power line core is a Class 5 soft copper conductor specified in GB / T3953-2024;

[0013] The resistivity of the soft copper conductor is ≤ 0.17100Ω·mm 2 / m, elongation ≤25%.

[0014] The above technical measures use Class 5 soft copper conductor specified in GB / T3953-2024 as the power line core, which has the characteristics of low resistance, high transmission and strong tensile strength, and can well meet the power transmission needs of large-power offshore wind turbines.

[0015] The isolation layer of the power core is an overlapping wrapping structure of a polypropylene tape outside the twisted structure of the power core;

[0016] The overlapping wrapping rate of the polypropylene tape is 10-30%.

[0017] The above technical measures adopt an overlapping wrapping structure of polypropylene tape outside the twisted structure of the power line core, thereby ensuring the roundness and stability of the power line core.

[0018] The twisted gaps of the multiple power cores of the cable core are filled with a filler of a cotton and linen rope structure. This technical measure enhances the roundness and tensile strength of the cable and gives the cable good waterproof and moisture-proof capabilities.

[0019] The cable core also has a temperature measuring optical fiber unit arranged at the center of the twisted gap of the multiple power line cores;

[0020] The temperature measuring optical fiber unit is a dual-mode optical fiber structure.

[0021] This technical measure can monitor the temperature changes of offshore wind turbine cables in real time and provide feedback during the operation of the cables, making it convenient to detect cable abnormalities in a timely manner and facilitating prevention and maintenance.

[0022] The outer part of the cable core is formed with a wrapping layer with a non-woven overlapping wrapping structure;

[0023] The overlapping wrapping rate of the wrapping layer is 15-20%. This technical measure further improves the roundness and tensile strength of the cable.

[0024] The outer part of the wrapping layer is formed with an insulating layer by extrusion molding of ethylene-propylene-rubber insulation rubber mixed material with a temperature resistance of 125°C;

[0025] The extruded thickness of the insulating layer is 2.4-2.6 mm. This technical measure improves the high temperature resistance of the cable and ensures the normal operation of the cable under high temperature conditions.

[0026] The outer part of the insulating layer is formed with a sheath layer by extrusion of a polyethylene rubber sheath material specially used for fan cables and resistant to cold at -40°C;

[0027] The extruded thickness of the sheath layer is 5.6-6.0 mm.

[0028] This technical measure adopts a special polyethylene rubber sheath material for fan cables. The material is anti-mildew, salt spray resistant, tear resistant and has good tensile strength. It also improves the cable's low temperature resistance and ensures the normal operation of the cable under low temperature conditions.

[0029] The beneficial technical effect of the utility model is: the utility model aims at the particularity of the working environment of offshore wind turbines, and uses a low-resistance, high-transmission-power soft copper conductor to form a power line core, and is supplemented with high-temperature resistant anti-corrosion grease for anti-corrosion filling, thereby achieving the technical effects of salt spray resistance, corrosion resistance, and capacity increase, and meeting the high-power transmission technology requirements of offshore wind turbines. In addition, the power line core of the cable core adopts a structure of first bundle twisting and then re-twisting in the same direction, so that the relative slip distance between layers is large, the flexibility is good, and it is conducive to laying and installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the utility model.

[0031] Figure 2 It is a partial schematic diagram of the utility model.

[0032] The meaning of the codes in the figure are: 1—power cell; 11—conductor strand; 12—high temperature resistant anti-corrosion grease; 13—isolation layer; 2—temperature measuring optical fiber unit; 3—filler; 4—wrapping layer; 5—insulation layer; 6—sheath layer. DETAILED DESCRIPTION

[0033] The utility model relates to the technical field of cable production, specifically a corrosion-resistant flexible cable for a capacity-increasing offshore wind turbine generator. Figure 1 and Figure 2 The technical solution of the utility model is clearly and in detail explained.

[0034] Example 1

[0035] See also Figure 1 and Figure 2 As shown, a corrosion-resistant flexible cable for a capacity-increasing offshore wind turbine generator comprises a cable core, and a wrapping layer 4, an insulating layer 5 and a sheath layer 6 arranged in sequence from the inside to the outside.

[0036] The cable core comprises three power cores 1 twisted together, a filler 3 filled in the twisted gaps of the power cores 1 , and a temperature measuring optical fiber unit 2 arranged at the center of the twisted gaps of the power cores 1 .

[0037] The power line core 1 is formed by twisting a plurality of conductor strands 11 , the twisted gaps are filled with high temperature resistant anti-corrosion grease 12 , and an isolation layer 13 is formed by overlapping and wrapping the twisted structure of the power line core 1 .

[0038] The above-mentioned conductor strand 11 is formed by twisting a plurality of soft copper conductors, and the above-mentioned conductor strand 11 is formed by twisting a plurality of soft copper conductors with a single wire diameter of about 0.30 mm, and the bundle pitch diameter ratio of the conductor strand 11 is about 16 times; the twisted pitch diameter ratio of the multiple conductor strands 11 of the above-mentioned power line core 1 is about 10 times, and the twisting direction of the above-mentioned conductor strand 11 is the same as the bundle twisting direction of the soft copper conductor.

[0039] Furthermore, the soft copper conductor is a Class 5 soft copper conductor specified in GB / T3953-2024; its resistivity is ≤0.17100Ω·mm 2 / m, elongation ≤25%;

[0040] The high temperature resistant and anti-corrosion grease 12 is filled in the twisted gap of the power line core 1 .

[0041] Furthermore, the high temperature resistant anti-corrosion grease is selected as 40A120 type specified in GB / T36292 "Anti-corrosion grease for overhead wires", which has an applicable temperature of -40-120°C and can be used in various working conditions at sea.

[0042] The isolation layer 13 is an overlapping wrapping structure of a polypropylene tape outside the twisted structure of the power line core 1; the overlapping wrapping coverage rate of the polypropylene tape is about 10%.

[0043] Furthermore, the isolation layer material is selected from polypropylene PP tape, which can enhance the roundness and stability of the power line core by overlapping wrapping.

[0044] The filler 3 is a cotton and linen rope structure filled in the twisted gaps of the three power line cores 1 .

[0045] Furthermore, the filling material is cotton and linen rope, which has high softness and good waterproof and moisture-proof properties.

[0046] The temperature measuring optical fiber unit 2 is a dual-mode optical fiber structure arranged at the center of the twisted gap of the three power line cores 1 .

[0047] Furthermore, the temperature measuring optical fiber unit adopts multimode optical fiber, which can improve the accuracy of information transmission when the temperature sensing changes greatly.

[0048] The wrapping layer 4 is an overlapping wrapping structure of non-woven fabric outside the cable core; the overlapping wrapping coverage rate of the wrapping layer 4 is about 15%;

[0049] Furthermore, the wrapping material is a reinforced non-woven fabric with a high temperature resistance level of 130-150°C.

[0050] The insulating layer 5 is an extruded structure of an ethylene-propylene-rubber mixed material having a temperature resistance of 125° C. on the outside of the wrapping layer 4; the extruded thickness of the insulating layer 5 is about 2.4 mm.

[0051] Furthermore, the insulating layer material is an ethylene-propylene rubber insulation mixture with a high temperature resistance grade of 125°C and a model of EPR-125°C.

[0052] The sheath layer 6 is a polyethylene rubber sheath material specially used for wind turbine cables and is resistant to cold at -40°C. It is formed on the outside of the insulating layer 5 and has an extruded structure. The extruded thickness of the sheath layer 6 is about 5.6 mm.

[0053] Furthermore, the sheath material is selected from a salt spray and mildew resistant polyethylene rubber sheath material of model SH-125℃. It complies with the provisions of GB / T2423.17-2008 salt spray resistance and GJB150.10A-2009 mildew resistance. The sheath layer extruded from the above material can pass the bundled combustion test Class B specified in GB / T1830.34, and the tensile strength is not less than 12N / mm², the elongation at break is not less than 300%, and the tear strength is not less than 6N / mm².

[0054] Example 2

[0055] See also Figure 1 and Figure 2 As shown, a corrosion-resistant flexible cable for a capacity-increasing offshore wind turbine generator comprises a cable core, and a wrapping layer 4, an insulating layer 5 and a sheath layer 6 arranged in sequence from the inside to the outside.

[0056] The cable core comprises three power cores 1 twisted together, a filler 3 filled in the twisted gaps of the power cores 1 , and a temperature measuring optical fiber unit 2 arranged at the center of the twisted gaps of the power cores 1 .

[0057] The power line core 1 is formed by twisting a plurality of conductor strands 11 , the twisted gaps are filled with high temperature resistant anti-corrosion grease 12 , and an isolation layer 13 is formed by overlapping and wrapping the twisted structure of the power line core 1 .

[0058] The above-mentioned conductor strand 11 is formed by twisting a plurality of soft copper conductors into bundles, and the above-mentioned conductor strand 11 is formed by twisting a plurality of soft copper conductors into bundles, and the above-mentioned conductor strand 11 is formed by twisting a plurality of soft copper conductors with a single wire diameter of approximately 0.40 mm, and the bundle pitch diameter ratio of the conductor strand 11 is approximately 22 times; the twisted pitch diameter ratio of the multiple conductor strands 11 of the above-mentioned power line core 1 is approximately 12 times, and the twisting direction of the above-mentioned conductor strand 11 is the same as the bundle twisting direction of the soft copper conductor.

[0059] The soft copper conductor of the power line core 1 is the Class 5 soft copper conductor specified in GB / T3953-2024; its resistivity is ≤ 0.17100Ω·mm 2 / m, elongation ≤25%.

[0060] The high temperature resistant and anti-corrosion grease 12 is filled in the twisted gap of the power line core 1 .

[0061] Furthermore, the high temperature resistant anti-corrosion grease is selected as 40A120 type specified in GB / T36292 "Anti-corrosion grease for overhead wires", which has an applicable temperature of -40-120°C and can be used in various working conditions at sea.

[0062] The isolation layer 13 is an overlapping wrapping structure of a polypropylene tape outside the twisted structure of the power line core 1; the overlapping wrapping coverage rate of the polypropylene tape is about 20%.

[0063] Furthermore, the isolation layer material is selected from polypropylene PP tape, which can enhance the roundness and stability of the power line core by overlapping wrapping.

[0064] The filler 3 is a cotton and linen rope structure filled in the twisted gaps of the three power line cores 1 .

[0065] Furthermore, the filling material is cotton and linen rope, which has high softness and good waterproof and moisture-proof properties.

[0066] The temperature measuring optical fiber unit 2 is a dual-mode optical fiber structure arranged at the center of the twisted gap of multiple power line cores 1.

[0067] Furthermore, the temperature measuring optical fiber unit adopts multimode optical fiber, which can improve the accuracy of information transmission when the temperature sensing changes greatly.

[0068] The wrapping layer 4 is an overlapping wrapping structure of non-woven fabric outside the cable core; the overlapping wrapping coverage rate of the wrapping layer 4 is about 18%;

[0069] Furthermore, the wrapping material is a reinforced non-woven fabric with a high temperature resistance level of 130-150°C.

[0070] The insulating layer 5 is an extruded structure of an ethylene-propylene-rubber mixed material having a temperature resistance of 125° C. on the outside of the wrapping layer 4; the extruded thickness of the insulating layer 5 is about 2.5 mm.

[0071] Furthermore, the insulating layer material is an ethylene-propylene rubber insulation mixture with a high temperature resistance grade of 125°C and a model of EPR-125°C.

[0072] The sheath layer 6 is a polyethylene rubber sheath material specially used for wind turbine cables and is cold-resistant at -40°C. It is formed on the outside of the insulating layer 5 and has an extruded structure. The extruded thickness of the sheath layer 6 is about 5.8 mm.

[0073] Furthermore, the sheath material is selected from a salt spray and mildew resistant polyethylene rubber sheath material of model SH-125℃. It complies with the provisions of GB / T2423.17-2008 salt spray resistance and GJB150.10A-2009 mildew resistance. The sheath layer extruded from the above material can pass the bundled combustion test Class B specified in GB / T1830.34, and the tensile strength is not less than 12N / mm², the elongation at break is not less than 300%, and the tear strength is not less than 6N / mm².

[0074] Example 3

[0075] See also Figure 1 and Figure 2 As shown, a corrosion-resistant flexible cable for a capacity-increasing offshore wind turbine generator comprises a cable core, and a wrapping layer 4, an insulating layer 5 and a sheath layer 6 arranged in sequence from the inside to the outside.

[0076] The cable core comprises three power cores 1 twisted together, a filler 3 filled in the twisted gaps of the power cores 1 , and a temperature measuring optical fiber unit 2 arranged at the center of the twisted gaps of the power cores 1 .

[0077] The power line core 1 is formed by twisting a plurality of conductor strands 11 , the twisted gaps are filled with high temperature resistant anti-corrosion grease 12 , and an isolation layer 13 is formed by overlapping and wrapping the twisted structure of the power line core 1 .

[0078] The above-mentioned conductor strand 11 is formed by twisting a plurality of soft copper conductors into bundles, and the above-mentioned conductor strand 11 is formed by twisting a plurality of soft copper conductors into bundles, and the above-mentioned conductor strand 11 is formed by twisting a plurality of soft copper conductors with a single wire diameter of approximately 0.50 mm, and the bundle pitch diameter ratio of the conductor strand 11 is approximately 28 times; the twisted pitch diameter ratio of the multiple conductor strands 11 of the above-mentioned power line core 1 is approximately 13 times, and the twisting direction of the above-mentioned conductor strand 11 is the same as the bundle twisting direction of the soft copper conductor.

[0079] The soft copper conductor of the power line core 1 is the Class 5 soft copper conductor specified in GB / T3953-2024; its resistivity is ≤ 0.17100Ω·mm 2 / m, elongation ≤25%.

[0080] The high temperature resistant and anti-corrosion grease 12 is filled in the twisted gap of the power line core 1 .

[0081] Furthermore, the high temperature resistant anti-corrosion grease is selected as 40A120 type specified in GB / T36292 "Anti-corrosion grease for overhead wires", which has an applicable temperature of -40-120°C and can be used in various working conditions at sea.

[0082] The isolation layer 13 is an overlapping wrapping structure of a polypropylene tape outside the twisted structure of the power line core 1; the overlapping wrapping coverage rate of the polypropylene tape is about 30%.

[0083] Furthermore, the isolation layer material is selected from polypropylene PP tape, which can enhance the roundness and stability of the power line core by overlapping wrapping.

[0084] The filler 3 is a cotton and linen rope structure filled in the twisted gaps of the three power line cores 1 .

[0085] Furthermore, the filling material is cotton and linen rope, which has high softness and good waterproof and moisture-proof properties.

[0086] The temperature measuring optical fiber unit 2 is a dual-mode optical fiber structure arranged at the center of the twisted gap of multiple power line cores 1.

[0087] Furthermore, the temperature measuring optical fiber unit adopts multimode optical fiber, which can improve the accuracy of information transmission when the temperature sensing changes greatly.

[0088] The wrapping layer 4 is an overlapping wrapping structure of non-woven fabric on the outside of the cable core; the overlapping wrapping coverage rate of the wrapping layer 4 is about 20%;

[0089] Furthermore, the wrapping material is a reinforced non-woven fabric with a high temperature resistance level of 130-150°C.

[0090] The insulating layer 5 is an extruded structure of an ethylene-propylene-rubber mixed material having a temperature resistance of 125° C. on the outside of the wrapping layer 4; the extruded thickness of the insulating layer 5 is about 2.6 mm.

[0091] Furthermore, the insulating layer material is an ethylene-propylene rubber insulation mixture with a high temperature resistance grade of 125°C and a model of EPR-125°C.

[0092] The sheath layer 6 is a polyethylene rubber sheath material specially used for wind turbine cables and is resistant to cold at -40°C. It is formed on the outside of the insulating layer 5 and has an extruded structure. The extruded thickness of the sheath layer 6 is about 6.0 mm.

[0093] Furthermore, the sheath material is selected from a salt spray and mildew resistant polyethylene rubber sheath material of model SH-125℃. It complies with the provisions of GB / T2423.17-2008 salt spray resistance and GJB150.10A-2009 mildew resistance. The sheath layer extruded from the above material can pass the bundled combustion test Class B specified in GB / T1830.34, and the tensile strength is not less than 12N / mm², the elongation at break is not less than 300%, and the tear strength is not less than 6N / mm².

[0094] The above specific technical solutions are only used to illustrate the present invention, rather than to limit it.

[0095] Although the present invention has been described in detail with reference to the above-mentioned specific technical solutions, those skilled in the art should understand that they can still modify the above-mentioned specific technical solutions, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the present invention.

Claims

1. A corrosion-resistant flexible cable for a capacity-increasing offshore wind turbine, comprising a cable core; The cable core comprises a plurality of power line cores (1) twisted together; Features: Each power line core (1) is formed by twisting a plurality of conductor strands (11), each conductor strand (11) is formed by twisting a plurality of soft copper conductors, and the twisting direction of the conductor strands (11) is the same as the twisting direction of the soft copper conductors; The twisted gap of the power line core (1) is filled with high temperature resistant anti-corrosion grease (12); An isolation layer (13) is coated outside the twisted structure of the power line core (1).

2. According to claim 1, the corrosion-resistant flexible cable for the capacity-increasing offshore wind turbine generator is characterized in that: The conductor strand (11) of the power line core (1) is formed by twisting a plurality of soft copper conductors with a single wire diameter of 0.30 to 0.50 mm, and the strand pitch ratio of the conductor strand (11) is 16 to 28 times; The twisted pitch diameter ratio of the multiple conductor strands (11) of the power line core (1) is 10 to 13 times.

3. The corrosion-resistant flexible cable for a capacity-increasing offshore wind turbine according to claim 1 or 2, characterized in that: The soft copper conductor of the power line core (1) is a Class 5 soft copper conductor specified in GB / T3953-2024; The resistivity of the soft copper conductor is ≤ 0.17100Ω·mm 2 / m, elongation ≤25%.

4. The corrosion-resistant flexible cable for a capacity-increasing offshore wind turbine according to claim 1 is characterized in that: The isolation layer (13) of the power line core (1) is an overlapping wrapping structure of polypropylene tape outside the twisted structure of the power line core (1); The overlapping wrapping rate of the polypropylene tape is 10-30%.

5. The corrosion-resistant flexible cable for a capacity-increasing offshore wind turbine according to claim 1 is characterized in that: The twisted gaps between the multiple power line cores (1) of the cable core are filled with a filler (3) with a cotton and linen rope structure.

6. The corrosion-resistant flexible cable for a capacity-increasing offshore wind turbine according to claim 1 or 5, characterized in that: The cable core also has a temperature measuring optical fiber unit (2) arranged at the center of the twisted gap between the plurality of power line cores (1); The temperature measuring optical fiber unit (2) is a dual-mode optical fiber structure.

7. The corrosion-resistant flexible cable for a capacity-increasing offshore wind turbine according to claim 1 or 5, characterized in that: The outside of the cable core is formed with a wrapping layer (4) with a non-woven fabric overlapping wrapping structure; The overlapping wrapping rate of the wrapping layer (4) is 15-20%.

8. The corrosion-resistant flexible cable for a capacity-increasing offshore wind turbine according to claim 7 is characterized in that: The outside of the wrapping layer (4) is formed with an insulating layer (5) by extrusion molding using a 125°C temperature-resistant ethylene-propylene rubber mixed material; The extruded thickness of the insulating layer (5) is 2.4 to 2.6 mm.

9. The corrosion-resistant flexible cable for a capacity-increasing offshore wind turbine according to claim 8, characterized in that: The outer part of the insulating layer (5) is formed with a sheath layer (6) by extrusion molding using a polyethylene rubber sheath material specially used for fan cables and resistant to cold at -40°C; The extruded thickness of the sheath layer (6) is 5.6-6.0 mm.

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