CN114068061A - Flexible cable for 10MW offshore wind generating set and preparation method thereof - Google Patents

Flexible cable for 10MW offshore wind generating set and preparation method thereof Download PDF

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Publication number
CN114068061A
CN114068061A CN202111625242.6A CN202111625242A CN114068061A CN 114068061 A CN114068061 A CN 114068061A CN 202111625242 A CN202111625242 A CN 202111625242A CN 114068061 A CN114068061 A CN 114068061A
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twisting
flexible cable
offshore wind
sheath
wires
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李强
聂玉阳
曾智民
李胜涛
董丽莹
魏鸿悦
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Tianjin Jinshan Electric Wire & Cable Co ltd
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Tianjin Jinshan Electric Wire & Cable Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
    • H01B1/026—Alloys based on copper
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/02—Stranding-up
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/14—Insulating conductors or cables by extrusion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers by extrusion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/28—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances natural or synthetic rubbers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
    • H01B5/08—Several wires or the like stranded in the form of a rope
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/0009—Details relating to the conductive cores
    • H01B7/0018—Strip or foil conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/182—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring comprising synthetic filaments
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables

Abstract

The invention belongs to the technical field of wires and cables, and particularly relates to a flexible cable for a 10MW offshore wind generating set and a preparation method thereof. The invention provides a flexible cable for a 10MW offshore wind generating set, which can obviously improve the torsion resistance and the tensile resistance of the cable, and has excellent high-low temperature resistance, ageing resistance, salt mist resistance and flame retardance, and a preparation method thereof.

Description

Flexible cable for 10MW offshore wind generating set and preparation method thereof
Technical Field
The invention belongs to the technical field of wires and cables, and particularly relates to a flexible cable for a 10MW offshore wind generating set and a preparation method thereof.
Background
The prior art is as follows:
at present, offshore wind energy resources are rich, the available sea area of China can reach as much as 300 million square kilometers, the offshore wind energy resources are one of the most abundant countries of offshore wind energy resources in the world, the primary estimation of the exploitable and utilizable wind energy resources is about 10 hundred million kW, and the exploitable and utilizable wind energy storage capacity at sea is about 7.5 hundred million kW. With the development of the wind power market, the installation amount of wind generating sets increases year by year, and the demand of wind energy cables matched with the wind generating sets is increased. The known single-core wind energy cable consists of a conductor, an insulating layer and a sheath layer, and has poor tensile property and torsion property and short service life in the use process. When the cable is twisted under the action of self gravity, the phenomena of bulging, cracking and twisting are easily generated on the surface of the cable, and the normal use of the cable is influenced.
However, the present inventors have found that the above prior art has at least the following technical problems:
the common tensile and torsion-resistant flexible cable for the wind generating set generally adopts ethylene propylene rubber insulation at 90 ℃, the sheath adopts chlorosulfonated polyethylene rubber sheath, the requirements of the flexible cable for the 10MW offshore wind generating set on insulation and sheath materials are higher, and the tensile strength, ageing resistance, tear resistance and other properties of the conventional tensile and torsion-resistant flexible cable for the wind generating set are relatively low.
The difficulty and significance for solving the technical problems are as follows:
therefore, based on the problems, the flexible cable for the 10MW offshore wind generating set and the preparation method thereof have important practical significance, and the flexible cable can enable the torsion resistance and the tensile resistance of the cable to be remarkably improved, and meanwhile, the cable also has excellent high and low temperature resistance, ageing resistance, salt mist resistance and flame retardant property.
Disclosure of Invention
The application aims to solve the technical problems in the prior art and provide the flexible cable for the 10MW offshore wind generating set, which can enable the torsion resistance and the tensile resistance of the cable to be obviously improved, and meanwhile, the cable also has excellent high and low temperature resistance, ageing resistance, salt spray resistance and flame retardance, and the preparation method thereof.
The technical scheme adopted by the embodiment of the application to solve the technical problems in the prior art is as follows:
the utility model provides a 10MW flexible cable for offshore wind generating set, 10MW flexible cable for offshore wind generating set includes conductor, enhancement layer, insulating layer, restrictive coating, and the conductor outside is the enhancement layer, and the enhancement layer outside is the insulating layer, and the restrictive coating has been extruded outside the insulating layer, and the conductor includes copper wire single line and copper foil silk, and the copper foil silk includes the shellproof silk fibre line of kevlar and copper foil strap, is done by the shellproof silk fibre line of kevlar and supports, forms with the copper foil strap around the package, and the enhancement layer adopts the shellproof silk of kevlar to weave and forms.
The flexible cable for the 10MW offshore wind generating set has the characteristics of higher conductor compactness, flexibility, torsion resistance and tensile property, excellent high and low temperature resistance, ageing resistance, salt mist resistance, flame retardance and the like. The Kevlar bulletproof wire is woven to form the woven layer, and the woven layer serves as a reinforcing layer to play a reinforcing role.
The embodiment of the application can also adopt the following technical scheme:
in the flexible cable for the 10MW offshore wind generating set, the conductor is further composed of 7-12 copper wire single lines and 2-5 copper foil wires, the bundle-stranding pitch diameter ratio is 12-20 times, the copper wire single lines are oxygen-free flexible copper single lines, and the breaking elongation of the copper wire single lines is larger than or equal to 25%.
In the flexible cable for the 10MW offshore wind generating set, the weaving angle of the reinforcing layer is 40-50 degrees, and the weaving density is 55-60%.
In the flexible cable for the 10MW offshore wind turbine generator system, the thicknesses of the insulating layer and the sheath layer are 3.0mm and 3-5mm, respectively.
A preparation method of a flexible cable for a 10MW offshore wind generating set comprises the following steps:
the method comprises the following steps: a wire bundling process, wherein the small bundle strand is composed of 7-12 copper wire single wires and 2-5 copper foil wires, the bundle strand pitch diameter ratio is 18-20 times, and the bundle strand direction is the right direction;
step two: the secondary twisting process adopts twice secondary twisting, the first secondary twisting is carried out by using a small bundle twisting strand, the twisting pitch diameter ratio is 15-17 times, and the twisting direction is the left direction;
step three: a secondary twisting process, wherein secondary twisting is carried out by adopting the small strand after primary twisting, the twisting pitch diameter ratio is 12-14 times, and the twisting direction is the left direction;
step four: the reinforcing layer is woven by Kevlar bulletproof wires, the weaving angle is 40-50 degrees, and the weaving density is 55-60 percent;
step five: an insulation and sheath extrusion process, wherein the insulation and sheath material extrusion adopts double-layer co-extrusion and one-time extrusion, the insulation thickness is 2.5-3 mm, and the sheath thickness is 3.5-4 mm;
step six: and (3) a continuous vulcanization process, wherein a steam pipeline is used for a crosslinking process, the vulcanization parameter is 1.2-1.5 MPa, the vulcanization speed is 4-6 m/min, and the thermal extension is 50-75%.
The preparation method of the flexible cable for the 10MW offshore wind generating set has the advantages of simple process, convenience in operation, high product consistency, capability of obviously improving the torsion resistance and the tensile property of the cable, and high conductor tightness, flexibility, torsion resistance, tensile property and the like.
Double-layer co-extrusion is adopted for one-time extrusion, the cross section has no air holes, and the surface of the sheath is uniform, smooth and flat; the thermal extension is strictly controlled, so that the product reaches the optimal crosslinking degree.
A preparation method of a flexible cable for a 10MW offshore wind generating set comprises the following steps:
the method comprises the following steps: a wire bundling process, wherein the small bundle strand consists of 9 copper wire single wires and 3 copper foil wires, the bundle strand pitch diameter ratio is 18-20 times, and the bundle strand direction is the right direction;
step two: the secondary twisting process adopts twice secondary twisting, the first secondary twisting is carried out by using a small bundle twisting strand, the twisting structure is a 1+6 structure, the twisting pitch diameter ratio is 15-17 times, and the twisting direction is the left direction;
step three: a secondary twisting process, wherein secondary twisting is carried out by adopting the small strands after the primary twisting, the twisting structure is a 3+9+15 structure, the twisting pitch-diameter ratio is 12-14 times, the twisting direction is the left direction, the outer diameter is 25.4mm after twisting, and the nominal sectional area is 2 of a conductor with the diameter of 300 mm;
the first compound twisting adopts a twisting structure of a bundle twisting small strand as a 1+6 structure; the second compound twisting adopts a 3+9+15 structure of a twisting structure of the small strand after the first compound twisting. The conductor is not easy to loosen while the softness of the conductor is ensured by adopting a form of multiple composite stranded wires.
Step four: weaving a reinforcing layer, namely weaving 4500D Kevlar bulletproof wires, wherein the weaving angle is 40-50 degrees, and the weaving density is 55-60 percent;
step five: an insulation and sheath extrusion process, wherein the insulation and sheath material extrusion adopts double-layer co-extrusion and one-time extrusion, the insulation thickness is 2.5-3 mm, and the sheath thickness is 3.5-4 mm;
step six: and (3) a continuous vulcanization process, wherein a steam pipeline is used for a crosslinking process, the vulcanization parameter is 1.2-1.5 MPa, the vulcanization speed is 4-6 m/min, and the thermal extension is 50-75%.
Double-layer co-extrusion is adopted for one-time extrusion, the cross section has no air holes, and the surface of the sheath is uniform, smooth and flat; the thermal extension is strictly controlled, so that the product reaches the optimal crosslinking degree.
In the preparation method of the flexible cable for the 10MW offshore wind generating set, furthermore, the single copper wire in the first step is an oxygen-free soft copper wire, and the breaking elongation of the single copper wire is more than or equal to 25%; the copper foil wire in the first step is formed by combining a Kevlar bulletproof wire fiber wire and a copper foil metal belt, the Kevlar bulletproof wire fiber wire is used as a support, and the copper foil metal belt is used for wrapping.
In the above method for preparing the flexible cable for the 10MW offshore wind turbine generator system, further, the conductor bundle in the first step, the second step and the third step has the same paying-off tension in the stranding and twisting processes.
Because the paying-off tension is consistent, the phenomena of wire jumping and bulging do not exist, and the conductor surface is smooth, round and burr-free after twisting.
In the above method for preparing a flexible cable for a 10MW offshore wind turbine generator system, further, the insulating layer material in the fifth step is vulcanizable 105 ℃ temperature-resistant, ultra-clean, less than 15 kV-resistant soft medium-voltage ethylene propylene insulating rubber, the sheath layer material is a high-strength chlorosulfonated polyethylene rubber sheath, the nominal thicknesses of the insulating layer and the sheath layer in the fifth step are 3.0mm and 4.0mm respectively, the thicknesses of the thinnest point are 2.7mm and 3.3mm respectively, and the insulating layer is tightly connected with the braided reinforcing layer and the sheath layer.
The material has high tensile strength and elongation at break, and simultaneously has excellent high and low temperature resistance, ageing resistance, salt mist resistance, flame retardance and the like.
In the above method for preparing a flexible cable for a 10MW offshore wind turbine generator system, further, the thermal extension range of the steam vulcanization crosslinking in the sixth step is controlled to be less than 50%.
The insulation and the sheath achieve the best performance.
One or more technical schemes provided in the embodiment of the application have at least the following beneficial effects:
1. the copper foil wires are added for reinforcement when the conductor is bundled, so that the overall tensile property of the conductor is obviously improved.
2. The conductor adopts a one-time bundle twisting and two-time complex twisting structure, so that the compactness, the flexibility and the torsion resistance of the conductor are effectively improved.
3. The reinforcing layer is woven by Kevlar bulletproof wires, so that the tightness of the conductor is further increased, and the phenomena of bulging and loosening of the conductor in the twisting process are prevented. And meanwhile, the reinforcing layer is tightly connected with the insulating layer to improve the integral tensile property of the cable.
4. The insulating layer and the sheath layer are extruded once, so that the working procedures are saved, and the phenomenon that the insulation and the sheath are separated in the long-term twisting process of the cable to influence the service life of the cable is prevented.
5. The insulating layer is a vulcanizable 105 ℃ temperature-resistant, ultra-clean and 15kV below-resistant soft medium-voltage ethylene propylene rubber. The sheath layer material is a high-strength chlorosulfonated polyethylene rubber sheath, the material has high tensile strength and elongation at break, and meanwhile, the material has excellent high and low temperature resistance, ageing resistance, salt spray resistance, flame retardance and the like.
Drawings
FIG. 1 is a schematic structural diagram of a flexible cable for a 10MW offshore wind generating set according to the invention;
FIG. 2 is a schematic view of a conductor reinforcing structure of the present invention;
FIG. 3 is a schematic process flow diagram of the present invention.
In the figure, 1, a conductor, 2, a reinforcing layer, 3, an insulating layer, 4, a sheath layer, 5, copper foil wires, 6 and single copper wire wires.
Detailed Description
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example 1
Reference is made to figures 1, 2 and 3.
The utility model provides a 10MW flexible cable for offshore wind generating set, comprises conductor, enhancement layer, insulating layer, restrictive coating, and the conductor comprises copper wire single line and copper foil silk, and the copper foil silk is that copper foil metal strap spiral is wrapped on the shellproof silk fibre line of Kevlar and is formed by taking the fibre as the support, and the enhancement layer adopts the shellproof silk of Kevlar to weave to form, and the conductor outside is the enhancement layer, and the enhancement layer outside is the insulating layer, and the restrictive coating has been extruded outward to the insulating layer.
The conductor is formed by adopting a small bundle-twisted strand and adopting 9 copper wire single lines and 3 copper foil wires, the ratio of the section diameter of the bundle-twisted strand is 12-20 times, the copper wire single lines are anaerobic soft copper single lines, and the breaking elongation of the copper wire single lines is more than or equal to 25%. The weaving angle of the Kevlar bulletproof wire woven reinforcing layer is 40-50%, and the weaving density is 55-60%. The thicknesses of the insulating layer and the sheath layer are respectively 2mm and 4 mm.
Example 2
Reference is made to figures 1 and 2. A flexible cable for a 10MW offshore wind generating set comprises a conductor 1, and copper wires 5 and 6 are formed by copper wire single wires and copper foil wires, wherein the copper foil wires 5 enhance the tensile property of the conductor; the Kevlar bulletproof wire braided reinforcing layer 2 increases the tensile and torsion resistance of the whole cable, the braiding angle is 40-50 degrees, and the braiding density is 55-60 percent; insulating layer 3, restrictive coating 4 adopts novel good rubber materials once to extrude the holistic tensile of reinforced cable and resistant twist performance, and the material has good high low temperature resistance ability, ageing resistance, salt fog resistance and performance such as fire-retardant simultaneously, and insulating layer 4 and restrictive coating 5 nominal thickness are 3.0mm and 4.0mm respectively, and thinnest point thickness is 2.7mm and 3.3mm respectively.
The specific implementation process of the embodiment:
a preparation method of a flexible cable for a 10MW offshore wind generating set comprises the following steps:
the method comprises the following steps: a wire bundling process, wherein the small bundle strand consists of 9 copper wire single wires and 3 copper foil wires, the bundle strand pitch diameter ratio is 18-20 times, and the bundle strand direction is the right direction;
step two: the secondary twisting process adopts twice secondary twisting, the first secondary twisting is carried out by using a small bundle twisting strand, the twisting structure is a 1+6 structure, the twisting pitch diameter ratio is 15-17 times, and the twisting direction is the left direction;
step three: a secondary twisting process, wherein secondary twisting is carried out by adopting the small strands after the primary twisting, the twisting structure is a 3+9+15 structure, the twisting pitch-diameter ratio is 12-14 times, the twisting direction is the left direction, the outer diameter is 25.4mm after twisting, and the nominal sectional area is 2 of a conductor with the diameter of 300 mm;
step four: weaving a reinforcing layer, namely weaving 4500D Kevlar bulletproof wires, wherein the weaving angle is 40-50 degrees, and the weaving density is 55-60 percent;
step five: the method comprises an insulation and sheath extrusion process, wherein double-layer co-extrusion one-step extrusion is adopted for insulation and sheath material extrusion, and the requirements of uniform insulation and sheath thickness, no air holes in the cross section and uniform, smooth and flat sheath surface are met;
step six: a continuous vulcanization process, wherein a steam pipeline is used for a crosslinking process, the vulcanization parameter is 1.2-1.5 MPa, the vulcanization speed is 4-6 m/min, and the thermal extension is strictly controlled to enable the product to reach the optimal crosslinking degree;
step seven: and (5) a finished product inspection procedure, wherein the appearance, the structural size and the voltage test of the finished cable are inspected to obtain the flexible cable for the 10MW offshore wind generating set.
The performance indexes of the soft medium-voltage ethylene propylene rubber insulating layer with the temperature resistance of 105 ℃, ultra-cleanliness and resistance of below 15kV of the examples 1 and 2 of the invention and the performance indexes of the high-strength chlorosulfonated polyethylene rubber sheath layer are shown in tables 1 and 2:
table 1105 deg.C temperature resistant, ultra-clean, 15kV below resistant soft medium pressure ethylene propylene rubber insulation layer performance index
Figure BDA0003439740940000061
TABLE 2 Performance index of high-Strength Chlorosulfonated polyethylene rubber sheath layer
Figure BDA0003439740940000062
Figure BDA0003439740940000071
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
the copper foil wire is added to reinforce and double twisting when the conductor is twisted by a plurality of copper wires in a single wire bundle, the tightness, flexibility, torsion resistance and tensile property of the conductor are effectively improved, the reinforcing layer is woven by adding, the insulation is vulcanizable 105-DEG C temperature-resistant, ultra-clean and soft medium-voltage ethylene propylene insulating rubber below 15kV, and the sheath material is a high-strength chlorosulfonated polyethylene rubber sheath so that the cable has high torsion resistance and tensile property. The processing technology is simple, the product consistency can be ensured, the torsion resistance and the tensile strength of the cable can be obviously improved, and meanwhile, the cable also has excellent high-low temperature resistance, ageing resistance, salt mist resistance and flame retardance.
In conclusion, the invention provides the flexible cable for the 10MW offshore wind generating set, which can obviously improve the torsion resistance and the tensile resistance of the cable, and has excellent high and low temperature resistance, ageing resistance, salt mist resistance and flame retardance, and the preparation method thereof.
The present invention has been described in detail with reference to the above examples, but the description is only for the preferred examples of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims (10)

1. The utility model provides a flexible cable for offshore wind generating set of 10MW which characterized in that: the flexible cable for the 10MW offshore wind generating set comprises a conductor, a reinforcing layer, an insulating layer and a sheath layer, wherein the reinforcing layer is arranged on the outer side of the conductor, the insulating layer is arranged on the outer side of the reinforcing layer, the sheath layer is extruded outside the insulating layer, the conductor comprises copper wire single wires and copper foil wires, the copper foil wires comprise Kevlar bulletproof wire fiber wires and copper foil metal bands, the Kevlar bulletproof wire fiber wires are used as supports and are wound by the copper foil metal bands, and the reinforcing layer is formed by weaving Kevlar bulletproof wires.
2. The flexible cable for 10MW offshore wind turbine unit according to claim 1, characterized in that: the conductor is composed of 7-12 copper wire single lines and 2-5 copper foil wires, the bundle-stranding pitch diameter ratio is 12-20 times, the copper wire single lines are oxygen-free soft copper single lines, and the breaking elongation of the copper wire single lines is larger than or equal to 25%.
3. The flexible cable for 10MW offshore wind turbine unit according to claim 1, characterized in that: the weaving angle of the reinforcing layer is 40-50 degrees, and the weaving density is 55-60 percent.
4. The flexible cable for 10MW offshore wind turbine unit according to claim 1, characterized in that: the thicknesses of the insulating layer and the sheath layer are respectively 3.0mm and 3-5 mm.
5. A preparation method of a flexible cable for a 10MW offshore wind generating set is characterized by comprising the following steps: the preparation method of the flexible cable for the 10MW offshore wind generating set comprises the following steps:
the method comprises the following steps: a wire bundling process, wherein the small bundle strand is composed of 7-12 copper wire single wires and 2-5 copper foil wires, the bundle strand pitch diameter ratio is 18-20 times, and the bundle strand direction is the right direction;
step two: the secondary twisting process adopts twice secondary twisting, the first secondary twisting is carried out by using a small bundle twisting strand, the twisting pitch diameter ratio is 15-17 times, and the twisting direction is the left direction;
step three: a secondary twisting process, wherein secondary twisting is carried out by adopting the small strand after primary twisting, the twisting pitch diameter ratio is 12-14 times, and the twisting direction is the left direction;
step four: the reinforcing layer is woven by Kevlar bulletproof wires, the weaving angle is 40-50 degrees, and the weaving density is 55-60 percent;
step five: an insulation and sheath extrusion process, wherein the insulation and sheath material extrusion adopts double-layer co-extrusion and one-time extrusion, the insulation thickness is 2.5-3 mm, and the sheath thickness is 3.5-4 mm;
step six: and (3) a continuous vulcanization process, wherein a steam pipeline is used for a crosslinking process, the vulcanization parameter is 1.2-1.5 MPa, the vulcanization speed is 4-6 m/min, and the thermal extension is 50-75%.
6. A preparation method of a flexible cable for a 10MW offshore wind generating set is characterized by comprising the following steps: the preparation method of the flexible cable for the 10MW offshore wind generating set comprises the following steps:
the method comprises the following steps: a wire bundling process, wherein the small bundle strand consists of 9 copper wire single wires and 3 copper foil wires, the bundle strand pitch diameter ratio is 18-20 times, and the bundle strand direction is the right direction;
step two: the secondary twisting process adopts twice secondary twisting, the first secondary twisting is carried out by using a small bundle twisting strand, the twisting structure is a 1+6 structure, the twisting pitch diameter ratio is 15-17 times, and the twisting direction is the left direction;
step three: and (3) a secondary twisting process, wherein the secondary twisting is carried out by adopting the small strand after the primary twisting, the twisting structure is a 3+9+15 structure, the twisting pitch-diameter ratio is 12-14 times, the twisting direction is in the left direction, the external diameter after twisting is 25.4mm, and the nominal sectional area is 300mm2The conductor of (1);
step four: weaving a reinforcing layer, namely weaving 4500D Kevlar bulletproof wires, wherein the weaving angle is 40-50 degrees, and the weaving density is 55-60 percent;
step five: an insulation and sheath extrusion process, wherein the insulation and sheath material extrusion adopts double-layer co-extrusion and one-time extrusion, the insulation thickness is 2.5-3 mm, and the sheath thickness is 3.5-4 mm;
step six: and (3) a continuous vulcanization process, wherein a steam pipeline is used for a crosslinking process, the vulcanization parameter is 1.2-1.5 MPa, the vulcanization speed is 4-6 m/min, and the thermal extension is 50-75%.
7. The method for preparing the flexible cable for the 10MW offshore wind generating set according to claim 5 or 6, wherein the flexible cable comprises: the single copper wire in the first step is an oxygen-free soft copper wire, and the breaking elongation of the single copper wire is more than or equal to 25%; the copper foil wire in the first step is formed by combining a Kevlar bulletproof wire fiber wire and a copper foil metal belt, the Kevlar bulletproof wire fiber wire is used as a support, and the copper foil metal belt is used for wrapping.
8. The method for preparing the flexible cable for the 10MW offshore wind generating set according to claim 5 or 6, wherein the flexible cable comprises: and in the first step, the second step and the third step, the conductor is bundled and twisted in the same paying-off tension.
9. The method for preparing the flexible cable for the 10MW offshore wind generating set according to claim 5 or 6, wherein the flexible cable comprises: the insulating layer material in the fifth step is vulcanizable soft medium-pressure ethylene propylene insulating rubber which is resistant to temperature of 105 ℃, ultra-clean and resistant to the voltage of below 15kV, the sheath layer material is a high-strength chlorosulfonated polyethylene rubber sheath, the nominal thicknesses of the insulating layer and the sheath layer in the fifth step are respectively 3.0mm and 4.0mm, the thicknesses of the thinnest points are respectively 2.7mm and 3.3mm, and meanwhile, the insulating layer is tightly connected with the woven reinforcing layer and the sheath layer.
10. The method for preparing the flexible cable for the 10MW offshore wind generating set according to claim 5 or 6, wherein the flexible cable comprises: the thermal extension range of the steam vulcanization crosslinking in the sixth step is controlled to be below 50%.
CN202111625242.6A 2021-12-28 2021-12-28 Flexible cable for 10MW offshore wind generating set and preparation method thereof Withdrawn CN114068061A (en)

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US4150249A (en) * 1977-01-12 1979-04-17 A/S Norsk Kabelfabrik Flame resistant cable structure
CN102403064A (en) * 2011-12-02 2012-04-04 衡阳恒飞电缆有限责任公司 Cold and torsion resistant flexible cable for wind power generation
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Application publication date: 20220218