WO2022095093A1 - Câble résistant à la torsion de 66 kv pour la transmission de l'énergie d'une éolienne, son procédé de préparation et son utilisation - Google Patents

Câble résistant à la torsion de 66 kv pour la transmission de l'énergie d'une éolienne, son procédé de préparation et son utilisation Download PDF

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WO2022095093A1
WO2022095093A1 PCT/CN2020/128240 CN2020128240W WO2022095093A1 WO 2022095093 A1 WO2022095093 A1 WO 2022095093A1 CN 2020128240 W CN2020128240 W CN 2020128240W WO 2022095093 A1 WO2022095093 A1 WO 2022095093A1
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layer
parts
cable
torsion
conductor
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PCT/CN2020/128240
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English (en)
Chinese (zh)
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曹西伟
张中云
刘亚欣
钱江伟
马振清
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江苏亨通电力电缆有限公司
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    • 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
    • H01B7/1875—Multi-layer sheaths
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
    • C08L23/0853—Vinylacetate
    • 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
    • H01B13/22—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
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/0009—Details relating to the conductive cores
    • 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
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H01B7/2813—Protection against damage caused by electrical, chemical or water tree deterioration
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2217—Oxides; Hydroxides of metals of magnesium
    • C08K2003/2224—Magnesium hydroxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/22—Halogen free composition
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend

Definitions

  • the invention relates to the technical field of cable preparation, in particular to the technical field of high-voltage cables, and in particular to a torsion-resistant cable for 66kV fan power transmission and a preparation method and application thereof.
  • Wind power has become one of the important ways of generating electricity from renewable resources in the world, and wind power generation accounts for 16% of the electricity generated from renewable resources in the world.
  • offshore wind resources have the characteristics of stability and large power generation.
  • offshore wind power is developing rapidly around the world.
  • Offshore wind power has developed from the initial 3-4MW era to the 6-7MW era, and then rapidly to the 9-10MW era, and the single-machine capacity will be further improved in the future.
  • the on-site voltage of offshore wind power applications in foreign countries has been increased to 66kV.
  • the number of fan circuits can be reduced, thereby reducing the wiring complexity of offshore booster stations, and even reducing the number of offshore booster stations, reducing investment and operation and maintenance costs.
  • the 66kV voltage level belongs to the high voltage category, especially for rubber sheathed cables for mobile applications, it is restricted by many factors such as raw materials, equipment manufacturing capabilities, processing conditions, and application environments.
  • the present invention provides a torsion-resistant cable for 66kV wind turbine power transmission.
  • the 66kV wind energy torsion-resistant flexible cable used for the unit is halogen-free, low-smoke, aging-resistant, resistant to special oil types and large torsional angles; and by using double-layer co-extrusion technology to control process parameters, it can meet the large-angle yaw of large offshore wind turbines. requirements, has good practical value and promotion value.
  • the present invention provides a torsion-resistant cable for power transmission of a 66kV fan, the cable including a cable core layer, a wrapping tape, a first sheath layer and a second sheath layer in sequence from the inside to the outside;
  • the cable core layer includes a main wire core and a ground wire core
  • the main wire core includes a first central conductor, a first semi-conductive nylon tape layer, a conductor shielding layer, an ethylene propylene rubber insulating layer and an insulating shielding layer in sequence from the inside to the outside;
  • the ground core includes a second center conductor, a second semi-conductive nylon tape layer and a semi-conductive cover layer in sequence from the inside to the outside;
  • the material of the second sheath layer is polyolefin rubber
  • the polyolefin rubber includes in parts by mass:
  • the torsion-resistant cable for 66kV wind turbine power transmission provided by the invention, the torsion-resistant cable for 66kV wind turbine power transmission adopts polyolefin rubber sheath material, and the cable structure is reasonably designed, which solves the problem of halogen-free 66kV wind energy torsion-resistant flexible cable for high-power wind turbines. , low smoke, aging resistance, special oil resistance and large torsion angle; and by using double-layer co-extrusion technology to control process parameters, it can meet the large-angle yaw requirements of large offshore wind turbines, which has good practical value and promotion. value.
  • the polyolefin rubber of the present invention is a halogen-free and low-smoke polyolefin rubber sheath material.
  • the base material is composed of ethylene-vinyl acetate copolymer, and various auxiliary agents such as anti-aging agent, filler material, cross-linking agent and vulcanization accelerator are mixed at the same time. , Combining the properties of a variety of raw materials, learning from each other's strengths and weaknesses, it has excellent aging resistance, high and low temperature resistance, high strength, salt spray corrosion resistance, hydrolysis resistance, oil resistance and other properties.
  • the polyolefin rubber includes 92-105 parts of ethylene-vinyl acetate copolymer, such as 92 parts, 94 parts, 95 parts, 97 parts, 98 parts, 100 parts, 101 parts, 103 parts, 104 parts or 105 parts etc., but not limited to the recited values, other unrecited values within the range are equally applicable.
  • the polyolefin rubber includes 3.2 to 4.8 parts of microcrystalline wax, for example, it can be 3.2 parts, 3.4 parts, 3.6 parts, 3.8 parts, 4 parts, 4.1 parts, 4.3 parts, 4.5 parts, 4.7 parts or 4.8 parts, etc., but Without being limited to the recited values, other non-recited values within the range are equally applicable.
  • the polyolefin rubber includes 3.5 to 4.5 parts of plasticizer, such as 3.5 parts, 3.7 parts, 3.8 parts, 3.9 parts, 4 parts, 4.1 parts, 4.2 parts, 4.3 parts, 4.4 parts or 4.5 parts, etc., but Without being limited to the recited values, other non-recited values within the range are equally applicable.
  • the polyolefin rubber includes 13 to 26 parts of white carbon black, such as 13 parts, 15 parts, 16 parts, 18 parts, 19 parts, 21 parts, 22 parts, 24 parts, 25 parts or 26 parts, etc., but Without being limited to the recited values, other non-recited values within the range are equally applicable.
  • the polyolefin rubber includes 80-120 parts of magnesium hydroxide, such as 80 parts, 85 parts, 89 parts, 94 parts, 98 parts, 103 parts, 107 parts, 112 parts, 116 parts or 120 parts, etc., but Without being limited to the recited values, other non-recited values within the range are equally applicable.
  • the polyolefin rubber includes 8.5 to 11 parts of elastomer, such as 8.5 parts, 8.8 parts, 9.1 parts, 9.4 parts, 9.7 parts, 9.9 parts, 10.2 parts, 10.5 parts, 10.8 parts or 11 parts, etc., but not Limitation to the recited values applies equally to other non-recited values within the range.
  • the polyolefin rubber includes 2.5 to 3.5 parts of anti-aging agent, such as 2.5 parts, 2.7 parts, 2.8 parts, 2.9 parts, 3 parts, 3.1 parts, 3.2 parts, 3.3 parts, 3.4 parts or 3.5 parts, etc., but not Limitation to the recited values applies equally to other non-recited values within the range.
  • the polyolefin rubber includes 3.5 to 4.5 parts of a vulcanizing agent, for example, 3.5 parts, 3.7 parts, 3.8 parts, 3.9 parts, 4 parts, 4.1 parts, 4.2 parts, 4.3 parts, 4.4 parts or 4.5 parts, etc., but not Limitation to the recited values applies equally to other non-recited values within the range.
  • the polyolefin rubber includes 1.5 to 2.5 parts of vulcanization assistant, for example, 1.5 parts, 1.7 parts, 1.8 parts, 1.9 parts, 2 parts, 2.1 parts, 2.2 parts, 2.3 parts, 2.4 parts or 2.5 parts, etc., but Without being limited to the recited values, other non-recited values within the range are equally applicable.
  • the polyolefin rubber includes 0.9 to 1.2 parts of a silane coupling agent, such as 0.9 parts, 1 part, 1.1 parts, or 1.2 parts, etc., but is not limited to the listed values, and other unlisted values within this range are also applicable .
  • a silane coupling agent such as 0.9 parts, 1 part, 1.1 parts, or 1.2 parts, etc.
  • the polyolefin rubber includes 1.8 to 2.8 parts of stearic acid, such as 1.8 parts, 2 parts, 2.1 parts, 2.2 parts, 2.3 parts, 2.4 parts, 2.5 parts, 2.6 parts, 2.7 parts or 2.8 parts, etc., but Without being limited to the recited values, other non-recited values within the range are equally applicable.
  • the polyolefin rubber includes 2.8 to 3.3 parts of wear-resistant carbon black, such as 2.8 parts, 2.9 parts, 3 parts, 3.1 parts, 3.2 parts or 3.3 parts, etc., but not limited to the listed values, other The same applies to non-recited values.
  • the stearic acid can improve the processing performance, increase the demoulding effect, and the magnesium hydroxide can increase the flame retardant performance of the material.
  • the polyolefin rubber comprises in parts by mass:
  • the polyolefin rubber comprises in parts by mass:
  • the number of main wire cores and ground wire cores in the cable core layer is the same.
  • the first central conductor is a soft copper conductor.
  • the second central conductor is a soft copper conductor.
  • the stranded wire layer of the soft copper conductor adopts forward and reverse twisting between the stranded wire layers.
  • the overall flexibility and torsion resistance of the cable must be improved.
  • the ropes between them are also twisted in the forward and reverse directions, and at the same time ensure that each layer has a small lay pitch (the lay pitch of the outermost layer is not more than 10 times, the second outer layer is not more than 12 times, and so on), flexibility and The better the torsion resistance.
  • the ratio of the lay length of the outermost layer of the soft copper conductor to the outer diameter of the lay is ⁇ 10, for example, it may be 10, 9.5, 9, 8.5, 8, 7.5, 7 or 6.5, etc.
  • each layer has a smaller lay pitch
  • the lay pitch of the outermost layer is not greater than 10 times
  • the second outer layer is no greater than 12 times, and so on.
  • the diameter of the single wire of the soft copper conductor is 0.3-0.5mm, for example, it can be 0.3mm, 0.32mm, 0.34mm, 0.35mm, 0.36mm, 0.38mm, 0.4mm, 0.401mm, 0.45mm, 0.5mm etc., preferably 0.401mm.
  • the gap between the main wire core and the ground wire core in the cable core layer is filled with semi-conductive filler.
  • the semi-conductive filler is an HBD semi-conductive center-fill structure.
  • the ethylene-propylene rubber insulating layer is a EPDM insulating layer.
  • the first sheath layer is a polyolefin rubber sheath layer.
  • the material of the first sheath layer is the same as the material of the second sheath layer.
  • the plasticizer is dioctyl sebacate.
  • the elastomer is a polyolefin-based elastomer.
  • the polyolefin-based elastomer comprises a combination of at least two of any one of ethylene-octene copolymer, ethylene-butene copolymer or ethylene-hexene copolymer, wherein typical but non-limiting Combinations are: Combination of ethylene-octene copolymer and ethylene-butene copolymer, Combination of ethylene-hexene copolymer and ethylene-butene copolymer, Combination of ethylene-hexene copolymer and ethylene-octene copolymer .
  • the antioxidant is antioxidant XH-3.
  • the vulcanizing agent is dicumyl peroxide.
  • the vulcanization aid is triallyl isocyanurate.
  • the silane coupling agent is A-172.
  • the wear-resistant carbon black is carbon black N-330.
  • the present invention provides the method for preparing a torsion-resistant cable for power transmission of a 66kV wind turbine according to the first aspect, the method comprising the following steps:
  • the stranded soft copper conductors are made of the first center conductor and the second center conductor respectively;
  • the first electrical nylon tape layer, the conductor shielding layer, the ethylene-propylene rubber insulating layer and the insulating shielding layer are sequentially wrapped outside the first semiconductor, and the main wire core is obtained by co-extrusion of three layers;
  • a second electrical nylon tape layer and a semi-conductive cover layer are sequentially wrapped outside the second semiconductor to obtain a ground wire core;
  • the preparation method of the cable provided by the invention can prepare the cable which is flexible at the same time and meets the requirements of halogen-free, low smoke and oil resistance, greatly improves the service life of the cable, and can be applied to the torsion-resistant cable for the power transmission of the 66kV wind turbine of the offshore high-power wind power .
  • the twisting of the soft copper conductor in step (1) adopts forward and reverse twisting.
  • the soft copper conductor adopts the fifth kind of circular stranded soft copper conductor specified in the GB/T3956 standard.
  • the fifth kind of round stranded soft copper conductor specified in GB/T3956 standard is used, and the conductor surface is smooth and clean, without damage to insulated burrs, sharp edges and raised or broken single wires.
  • the conductor shielding layer adopts a 66kV semiconducting inner shielding material whose performance meets the requirements of the IEC60840 standard.
  • the ethylene propylene rubber insulating layer adopts ethylene propylene rubber insulating material whose performance meets the requirements of the IEC60840 standard.
  • the insulating shielding layer adopts a non-peelable semiconducting outer shielding material.
  • the performance of the insulating shielding layer meets the requirements of the IEC60840 standard.
  • the semi-conductive cover layer is an HBD semi-conductive cover layer.
  • the HBD semi-conductive covering layer is used, which is extruded and wrapped on the outer surface of the semi-conductive nylon tape, which acts as an electrical connection between the main core conductor and the ground core conductor.
  • the temperature of the three-layer co-extrusion in step (1) is 102-108°C, such as 102°C, 102.7°C, 103.4°C, 104°C, 104.7°C, 105.4°C, 106°C, 106.7°C, 107.4°C °C or 108 °C, etc., but not limited to the listed values, and other unlisted values within this range are also applicable.
  • Extrusion temperature control the ethylene content of the EPDM rubber in the high-pressure ethylene-propylene rubber insulating material is relatively high, so the extrusion temperature is higher than that of ordinary ethylene-propylene rubber, and should be controlled at 105 ⁇ 5°C. If the temperature is too low, the The surface is not smooth and delicate or the inner shield is degummed. If the temperature is too high, the outer shield will be degummed or the insulating compound will be scorched. Therefore, the extrusion temperature temperature control system requires precise and constant.
  • the steam pressure of the three-layer co-extrusion is 1.0-1.5MPa, for example, it can be 0.5MPa, 0.52MPa, 0.55MPa, 0.6MPa, 0.67MPa, 0.7MPa, 0.72MPa, 0.75MPa, 0.78MPa or 0.8MPa etc., but not limited to the recited values, other unrecited values within the range are equally applicable.
  • the linear speed of the three-layer co-extrusion is 2.3-2.6m/min, such as 2.3m/min, 2.34m/min, 2.37m/min, 2.4m/min, 2.44m/min, 2.47m /min, 2.5m/min, 2.54m/min, 2.57m/min or 2.6m/min, etc., but not limited to the listed values, and other unlisted values within the range are also applicable.
  • the water level of the three-layer co-extrusion is controlled at 25-38%, such as 25%, 26.45%, 27.89%, 29.34%, 30.78%, 32.23%, 33.67%, 35.12%, 36.56% or 38% etc., but not limited to the recited values, other unrecited values within the range are equally applicable.
  • Ethylene-propylene rubber insulation material has high ethylene content and insufficient vulcanization, which is easy to cause secondary vulcanization deformation.
  • the steam should be determined according to the performance test results such as extrusion speed and cross-linking degree of the insulating material. Pressure, after repeated debugging, it is determined that the steam pressure is 1.0 ⁇ 1.5MPa, the line speed is 2.3 ⁇ 2.6m/min, and the water level control is 25 ⁇ 38%. , the mechanical properties meet the product requirements and the insulation deformation is significantly improved during secondary vulcanization.
  • a thousand-grade purification room is used in the process of filling the second jacket layer material.
  • the feeding system adopts a thousand-level purification room, and the blanking system adopts a gravity automatic blanking system.
  • the production line produces high-pressure Before the cable, all parts of the extruder, especially the extruder head, must be cleaned to avoid impurities mixed into the high-pressure ethylene-propylene rubber insulation.
  • the material needs to be strictly controlled to avoid the entry of impurities during the unpacking, pouring or suction and conveying process of materials.
  • the semiconductive filler in step (2) is an HBD semiconductive center filling structure.
  • the second sheath layer in step (3) is polyolefin rubber.
  • the preparation method of the polyolefin rubber comprises the following steps:
  • step (1') adding microcrystalline paraffin, plasticizer, white carbon black, magnesium hydroxide, anti-aging agent, silane coupling agent, stearic acid and wear-resistant carbon black to the primary mixing material described in step (1') Secondary mixing to obtain secondary mixing material;
  • step (2 ') add vulcanizing agent and auxiliary vulcanizing agent triallyl isocyanurate in the described secondary mixing material of step (2 '), obtain mixing rubber material after three times mixing;
  • step (3') After thinning and swinging the rubber compound described in step (3') on an open mill, it is successively opened on a three-roll calender and cooled by a cooling roll, and then passed through a talc powder box to obtain a polyolefin rubber.
  • the machine for primary mixing in step (1') is an internal mixer.
  • the temperature of the primary mixing is 40 to 50°C, for example, it can be 40°C, 42°C, 43°C, 44°C, 45°C, 46°C, 47°C, 48°C, 49°C or 50°C, etc., But not limited to the recited values, other non-recited values within the range are equally applicable.
  • the mixing time for one time is 5 to 6 minutes, for example, 5 minutes, 5.2 minutes, 5.3 minutes, 5.4 minutes, 5.5 minutes, 5.6 minutes, 5.7 minutes, 5.8 minutes, 5.9 minutes, 6 minutes, etc., but not limited to Recited values apply equally well to other non-recited values within the range.
  • the temperature of the secondary mixing in step (2') is 40 to 50°C, for example, 40°C, 42°C, 43°C, 44°C, 45°C, 46°C, 47°C, 48°C, 49°C or 50°C, etc., but not limited to the listed values, and other unlisted values within this range are also applicable.
  • the time for the secondary mixing is 2 to 3 min, for example, 2 min, 2.2 min, 2.3 min, 2.4 min, 2.5 min, 2.6 min, 2.7 min, 2.8 min, 2.9 min or 3 min, etc., but not Limitation to the recited values applies equally to other non-recited values within the range.
  • the temperature of the three-time mixing in step (3') is 40 to 50°C, such as 40°C, 42°C, 43°C, 44°C, 45°C, 46°C, 47°C, 48°C, 49°C °C or 50 °C, etc., but not limited to the listed values, and other unlisted values within this range are also applicable.
  • the three-time mixing time is 0.5-1.5min, for example, it can be 0.5min, 0.7min, 0.8min, 0.9min, 1min, 1.1min, 1.2min, 1.3min, 1.4min or 1.5min, etc., but Without being limited to the recited values, other non-recited values within the range are equally applicable.
  • the number of times of the thin pass in step (4') is 1 to 2 times, for example, it can be 1 or 2 times.
  • the number of times of swinging the glue is 2 to 3 times, for example, it may be 2 times or 3 times.
  • the present invention provides the use of the torsion-resistant cable for power transmission of a 66kV wind turbine according to the first aspect in a 66kV circuit for a wind turbine.
  • the working temperature of the cable is -40°C to 60°C, such as -40°C, -30°C, -20°C, -10°C, 0°C, 10°C, 20°C, 30°C, 40°C, 50°C or 60°C, etc.
  • the oil-resistant halogen-free low-smoke polyolefin rubber sheath material developed by the invention is used as the sheath of the 66kV wind energy torsion-resistant flexible cable for high-power wind turbines.
  • the cable structure is reasonably designed and the appropriate processing technology is formulated, which meets the requirements of the cable in normal operation. Power transmission and performance in working environment (working temperature: -40°C ⁇ +60°C), it solves the problem of 66kV wind energy torsion-resistant flexible cables for high-power wind turbines, with halogen-free, low-smoke, aging resistance, and special oil resistance , large torsion angle and other issues, has good practical value and promotion value.
  • the present invention at least has the following beneficial effects:
  • the torsion-resistant cable for 66kV fan power transmission provided by the present invention is resistant to torsion and soft, and has the advantages of halogen-free, low smoke, aging resistance, special oil resistance and large torsion angle, and the tensile strength after aging is ⁇ 9.7N/ mm 2 , elongation at break ⁇ 110%, change rate of tensile strength after oil immersion ⁇ -18%, change rate of elongation at break ⁇ -20%, excellent performance and broad application prospect;
  • the torsion-resistant cable for 66kV wind turbine power transmission provided by the present invention can be applied to the 66kV wind energy circuit for offshore high-power wind turbines, and solves the problem that existing cables cannot meet the large-angle yaw requirements of large offshore wind turbines;
  • the preparation method of the torsion-resistant cable for 66kV fan power transmission provided by the present invention comprehensively selects a specific polyolefin rubber material, adopts three-layer co-extrusion and double-layer co-extrusion process, and further combines a soft copper conductor stranding process to obtain Cables with excellent torsion resistance and softness.
  • FIG. 1 is a schematic structural diagram of a torsion-resistant cable for power transmission of a 66kV wind turbine provided in Embodiment 1 of the present invention.
  • This embodiment provides a torsion-resistant cable for 66kV fan power transmission.
  • the cable includes a cable core layer, a wrapping tape 7 , a first sheath layer 8 and a second sheath layer in sequence from the inside to the outside. 9;
  • the cable core layer includes a main wire core and a ground wire core;
  • the main wire core includes a first central conductor 1, a first semiconducting nylon tape layer 2, a conductor shielding layer 3, an ethylene propylene rubber insulating layer 4 and Insulation shielding layer 5;
  • the ground core includes a second center conductor 10, a second semi-conductive nylon tape layer 11 and a semi-conductive cover layer 12 in sequence from the inside to the outside;
  • the material of the second sheath layer 9 is polyolefin rubber;
  • the number of main cores and ground cores in the cable core layer is the same;
  • the first central conductor 1 is a soft copper conductor;
  • the second central conductor 10 is a soft copper conductor;
  • the forward and reverse twisting is adopted between the layer and the stranded layer; the ratio of the twisting distance between each stranded layer of the soft copper conductor to the outer diameter of the twisting is not more than 10 times the twist
  • the polyolefin rubber includes in parts by mass:
  • the preparation method of the torsion-resistant cable for power transmission of the 66kV wind turbine comprises the following steps:
  • the first center conductor and the second center conductor are respectively made by twisting the soft copper conductors in a forward and reverse twisting manner; the soft copper conductor adopts the fifth kind of circular stranded soft copper conductor specified in the GB/T3956 standard;
  • the first electrical nylon tape layer, the conductor shielding layer, the ethylene-propylene rubber insulating layer and the insulating shielding layer are sequentially wrapped outside the first semiconductor, and the main wire core is obtained by co-extrusion of three layers;
  • a second electrical nylon tape layer and a semi-conductive cover layer are sequentially wrapped outside the second semiconductor to obtain a ground wire core;
  • the conductor shielding layer adopts 66kV semi-conductive inner screen material whose performance meets the requirements of IEC60840 standard; the ethylene-propylene rubber insulating layer adopts ethylene-propylene rubber insulating material whose performance meets the requirements of IEC60840 standard; the insulating shielding layer adopts non-peelable semiconducting material.
  • the temperature of the three-layer co-extrusion is 105°C
  • the steam pressure is 1.2MPa
  • the line speed is 2.5m/min
  • the water level is controlled at 33%
  • the preparation method of the polyolefin rubber described in the step (3) and the first sheath layer and the second sheath layer includes the following steps:
  • the present embodiment provides a torsion-resistant cable for power transmission of a 66kV wind turbine, and the cable sequentially includes a cable core layer, a wrapping tape, a first sheath layer and a second sheath layer from the inside to the outside;
  • the cable core layer includes a main wire core and a ground wire core; the main wire core sequentially includes a first central conductor, a first semiconductive nylon tape layer, a conductor shielding layer, an ethylene propylene rubber insulating layer and an insulating shielding layer from inside to outside;
  • the ground wire core includes a second central conductor, a second semi-conductive nylon tape layer and a semi-conductive cover layer in sequence from inside to outside; the second sheath layer is made of polyolefin rubber; the inner main wire of the cable core layer
  • the number of cores and ground cores are the same; the first central conductor is a soft copper conductor; the second central conductor is a soft copper conductor; the stranded wire layer and the stranded wire layer of the soft copper conductor are in forward and reverse directions Stranding; the ratio of the twisting pitch between each stranded layer of the soft copper conductor to the outer diameter of the strand is not more than 10 times the laying distance of the outermost layer, and not more than
  • the polyolefin rubber includes in parts by mass:
  • the preparation method of the torsion-resistant cable for power transmission of the 66kV wind turbine comprises the following steps:
  • the first center conductor and the second center conductor are respectively made by twisting the soft copper conductors in a forward and reverse twisting manner; the soft copper conductor adopts the fifth kind of circular stranded soft copper conductor specified in the GB/T3956 standard;
  • the first electrical nylon tape layer, the conductor shielding layer, the ethylene-propylene rubber insulating layer and the insulating shielding layer are sequentially wrapped outside the first semiconductor, and the main wire core is obtained by co-extrusion of three layers;
  • the temperature of the three-layer co-extrusion is 102°C
  • the steam pressure is 1.0MPa
  • the line speed is 2.3m/min
  • the water level is controlled at 25%;
  • a second electrical nylon tape layer and a semi-conductive cover layer are sequentially wrapped outside the second semiconductor to obtain a ground wire core;
  • the conductor shielding layer adopts 66kV semi-conductive inner screen material whose performance meets the requirements of the IEC60840 standard;
  • the ethylene-propylene rubber insulating layer adopts the ethylene-propylene rubber insulating material whose performance meets the requirements of the IEC60840 standard;
  • the semi-conductive cover layer is HBD semi-conductive cover layer;
  • the preparation method of the polyolefin rubber described in the step (3) and the first sheath layer and the second sheath layer includes the following steps:
  • the present embodiment provides a torsion-resistant cable for power transmission of a 66kV wind turbine, and the cable sequentially includes a cable core layer, a wrapping tape, a first sheath layer and a second sheath layer from the inside to the outside;
  • the cable core layer includes a main wire core and a ground wire core; the main wire core sequentially includes a first central conductor, a first semiconductive nylon tape layer, a conductor shielding layer, an ethylene propylene rubber insulating layer and an insulating shielding layer from inside to outside;
  • the ground wire core includes a second center conductor, a second semi-conductive nylon tape layer and a semi-conductive cover layer in sequence from inside to outside; the second sheath layer is made of polyolefin rubber; the inner main wire of the cable core layer
  • the number of cores and ground cores are the same;
  • the first central conductor is a soft copper conductor;
  • the second central conductor is a soft copper conductor;
  • the stranded wire layer and the stranded wire layer of the soft copper conductor are in forward and reverse directions Stranding;
  • the ratio of the twisting pitch between each stranded layer of the soft copper conductor to the outer diameter of the twist is that the laying pitch of the outermost layer is not
  • the polyolefin rubber includes in parts by mass:
  • the preparation method of the torsion-resistant cable for power transmission of the 66kV wind turbine comprises the following steps:
  • the first center conductor and the second center conductor are respectively made by twisting the soft copper conductors in a forward and reverse twisting manner; the soft copper conductor adopts the fifth kind of circular stranded soft copper conductor specified in the GB/T3956 standard;
  • the first electrical nylon tape layer, the conductor shielding layer, the ethylene-propylene rubber insulating layer and the insulating shielding layer are sequentially wrapped outside the first semiconductor, and the main wire core is obtained by co-extrusion of three layers;
  • the temperature of the three-layer co-extrusion is 108°C
  • the steam pressure is 1.0MPa
  • the line speed is 2.6m/min
  • the water level is controlled at 38%;
  • a second electrical nylon tape layer and a semi-conductive cover layer are sequentially wrapped outside the second semiconductor to obtain a ground wire core;
  • the conductor shielding layer adopts 66kV semi-conductive inner screen material whose performance meets the requirements of the IEC60840 standard;
  • the ethylene-propylene rubber insulating layer adopts the ethylene-propylene rubber insulating material whose performance meets the requirements of the IEC60840 standard;
  • the semi-conductive cover layer is HBD semi-conductive cover layer;
  • the preparation method of the polyolefin rubber described in the step (3) and the first sheath layer and the second sheath layer includes the following steps:
  • This embodiment provides a torsion-resistant cable for power transmission of a 66kV fan, which is the same as that of Embodiment 1 except that the temperature of the three-layer co-extrusion in step (1) is 95°C.
  • This embodiment provides a torsion-resistant cable for power transmission of a 66kV fan, which is the same as that of Embodiment 1 except that the temperature of the three-layer co-extrusion in step (1) is 115°C.
  • This embodiment provides a torsion-resistant cable for power transmission of a 66kV fan.
  • the temperature of the cable is the same as that of Embodiment 1 except that the temperature of the three-layer co-extrusion in step (1) is 108°C.
  • This embodiment provides a torsion-resistant cable for power transmission of a 66kV fan, which is the same as that of Embodiment 1 except that the temperature of the three-layer co-extrusion in step (1) is 102°C.
  • the co-extrusion temperatures of Examples 6-7 are 108°C and 102°C, respectively.
  • the cables obtained by co-extrusion in Examples 6 and 7 The surface is smooth and delicate, and there is no degumming phenomenon of the conductor shielding layer, the ethylene-propylene rubber insulating layer or the insulating shielding layer, but the surface is rough in Example 4 and the ethylene-propylene rubber insulating layer has degumming phenomenon, and in Example 5, the insulating shielding layer appears The degumming phenomenon is eliminated, which shows that the present invention can effectively prevent the degumming phenomenon by adopting the three-layer co-extrusion temperature of 102-108°C.
  • This embodiment provides a torsion-resistant cable for power transmission of a 66kV fan, which is the same as that of Embodiment 1 except that the steam pressure of the three-layer co-extrusion in step (1) is 1.0 MPa.
  • This embodiment provides a torsion-resistant cable for power transmission of a 66kV fan, which is the same as that of Embodiment 1 except that the steam pressure of the three-layer co-extrusion in step (1) is 1.5 MPa.
  • This embodiment provides a torsion-resistant cable for power transmission of a 66kV fan, which is the same as that of Embodiment 1 except that the steam pressure of the three-layer co-extrusion in step (1) is 0.5 MPa.
  • This embodiment provides a torsion-resistant cable for power transmission of a 66kV fan, which is the same as that of Embodiment 1 except that the steam pressure of the three-layer co-extrusion in step (1) is 2.0 MPa.
  • the co-extrusion steam pressures of Examples 8-9 are 1.0 MPa and 1.5 MPa, respectively. Compared with the co-extrusion steam pressures of Examples 10 and 11, which are 0.5 MPa and 2.0 MPa, respectively, Examples 8 and 9
  • the ethylene-propylene rubber insulating material in the cable obtained by co-extrusion is fully vulcanized, which is suitable for the co-extrusion temperature, the mechanical properties meet the product requirements, and the insulation deformation phenomenon is significantly improved during secondary vulcanization.
  • the three-layer co-extrusion steam pressure of MPa matches the direction of 102-108 °C, which improves the performance of the cable.
  • This embodiment provides a torsion-resistant cable for power transmission of a 66kV fan, which is the same as that of Embodiment 1 except that the linear speed of the three-layer co-extrusion in step (1) is 1.8 m/min.
  • This embodiment provides a torsion-resistant cable for power transmission of a 66kV fan, which is the same as that of Embodiment 1 except that the linear speed of the three-layer co-extrusion in step (1) is 3.5 m/min.
  • Example 1 Compared with Example 12 and Example 13, Example 1 has better mechanical properties, better vulcanization effect, and no vulcanization deformation phenomenon, while Example 12 and Example 13 have vulcanization deformation phenomenon, so It is shown that the present invention improves the performance of the cable by controlling a specific line speed.
  • This embodiment provides a torsion-resistant cable for power transmission of a 66kV fan, except that "triallyl isocyanurate" in the polyolefin rubber is replaced with “trimethylolpropane trimethacrylate”. The rest are the same as in Example 1. 2. Comparative ratio
  • This comparative example provides a torsion-resistant cable for power transmission of a 66kV fan.
  • the cable is the same as in Example 1 except that the amount of magnesium hydroxide in the polyolefin rubber is 60 parts.
  • This comparative example provides a torsion-resistant cable for power transmission of a 66kV fan.
  • the cable is the same as Example 1 except that the polyolefin rubber contains 130 parts of magnesium hydroxide.
  • This comparative example provides a torsion-resistant cable for power transmission of a 66kV fan, which is the same as that of Example 1 except that the stearic acid in the polyolefin rubber is 1.2 parts.
  • This comparative example provides a torsion-resistant cable for power transmission of a 66kV fan, which is the same as that of Example 1 except that the stearic acid in the polyolefin rubber is 3.5 parts.
  • This comparative example provides a torsion-resistant cable for power transmission of a 66kV fan.
  • the cable is the same as that in Example 1 except that the content of triallyl isocyanurate in the polyolefin rubber is 1.0 parts.
  • This comparative example provides a torsion-resistant cable for power transmission of a 66kV fan.
  • the cable is the same as in Example 1 except that the content of triallyl isocyanurate in the polyolefin rubber is 3.2 parts.
  • Example 1 the polyolefin obtained by the test equipment such as electronic universal testing machine, Shore hardness tester, thermal conductivity tester, low temperature impact tester, volume resistivity tester, and AC medium strength tester was tested.
  • the rubber has been tested in various aspects, and the specific test methods are GB/T528-2009, GB/T2941-2006, GB/T2951-2008; the same method was used to test the ethylene-propylene rubber insulating layer in Comparative Example 1, and its test Conditions are shown in Table 1.
  • the torsion-resistant cable for 66kV fan power transmission provided by the present invention adopts a specific polyolefin rubber sheath material, and its aging tensile strength is ⁇ 9.7N/mm 2 , elongation at break The rate of change is ⁇ 110%, the change rate of tensile strength after oil immersion is ⁇ -18%, and the change rate of elongation at break is ⁇ -20%, which has the advantages of good aging resistance and special oil resistance;
  • Example 1 magnesium hydroxide is 100 parts, compared with 60 parts and 130 parts of magnesium hydroxide in Comparative Example 1 and Comparative Example 2, respectively, and In other words, in Example 1, the properties did not decrease significantly after aging, while in Comparative Example 1 and Comparative Example 2, the tensile strength decreased from 12.3N/mm 2 to 5.8N/mm 2 and from 14.1N/mm 2 respectively after aging.
  • Example 14 (3) Comprehensive Example 1 and Example 14 can be seen, adding triallyl isocyanurate in Example 1, compared with adding trimethylolpropane trimethacrylate in Example 14 , the anti-aging performance has decreased, which shows that the anti-aging performance of the polyolefin rubber sheath is improved by adding triallyl isocyanurate as a vulcanization aid in the present invention.
  • the torsion-resistant cable for 66kV wind turbine power transmission adopts polyolefin rubber sheath material and reasonably designs the cable structure, so as to solve the problem that the 66kV wind energy torsion-resistant flexible cable for high-power wind turbines is halogen-free, low-smoke, and durable. Aging, resistance to special oil types and large torsion angles; and can meet the large-angle yaw requirements of large offshore wind turbines, which has good practical value and promotion value.
  • the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must rely on the above detailed structural features to be implemented.
  • Those skilled in the art should understand that any improvement to the present invention, the equivalent replacement of the selected components of the present invention, the addition of auxiliary components, the selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

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  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Insulated Conductors (AREA)

Abstract

L'invention concerne un câble résistant à la torsion de 66 kV pour la transmission de l'énergie d'une éolienne, et un procédé de préparation. Selon le câble résistant à la torsion de 66 kV pour la transmission d'énergie d'une éolienne, les exigences en matière d'absence d'halogène, de faible fumée, de résistance au vieillissement, de résistance aux huiles spéciales et d'un grand angle de torsion d'un câble flexible résistant à la torsion de 66 kV pour une éolienne de grande puissance sont satisfaites par l'utilisation d'un matériau de gaine en caoutchouc polyoléfine et la conception raisonnable d'une structure de câble, et la présente invention a une bonne valeur pratique et une bonne valeur de popularisation. Dans le procédé de préparation, une technologie de coextrusion à double couche est utilisée ; une première couche de gaine (8) et une deuxième couche de gaine (9) sont étroitement collées ensemble, et l'effet de protection est bon.
PCT/CN2020/128240 2020-11-05 2020-11-12 Câble résistant à la torsion de 66 kv pour la transmission de l'énergie d'une éolienne, son procédé de préparation et son utilisation WO2022095093A1 (fr)

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