CN112435787A - Torsion-resistant cable for 66kV fan power transmission and preparation method and application thereof - Google Patents

Torsion-resistant cable for 66kV fan power transmission and preparation method and application thereof Download PDF

Info

Publication number
CN112435787A
CN112435787A CN202011223673.5A CN202011223673A CN112435787A CN 112435787 A CN112435787 A CN 112435787A CN 202011223673 A CN202011223673 A CN 202011223673A CN 112435787 A CN112435787 A CN 112435787A
Authority
CN
China
Prior art keywords
layer
parts
torsion
cable
conductor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011223673.5A
Other languages
Chinese (zh)
Inventor
曹西伟
刘亚欣
钱江伟
马振清
张仲韬
杨胜蓝
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Hengtong Power Cable Co Ltd
Original Assignee
Jiangsu Hengtong Power Cable Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Hengtong Power Cable Co Ltd filed Critical Jiangsu Hengtong Power Cable Co Ltd
Priority to CN202011223673.5A priority Critical patent/CN112435787A/en
Priority to PCT/CN2020/128240 priority patent/WO2022095093A1/en
Publication of CN112435787A publication Critical patent/CN112435787A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • 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

The torsion-resistant cable for 66kV fan power transmission is made of the polyolefin rubber sheath material, the cable structure is reasonably designed, the problems of no halogen, low smoke, aging resistance, special oil type resistance and large torsion angle of the 66kV wind energy torsion-resistant flexible cable for the high-power wind turbine generator set are solved, and the torsion-resistant cable has good practical value and popularization value; the invention also provides a preparation method of the torsion-resistant cable for 66kV fan power transmission, the preparation method adopts a double-layer co-extrusion technology, the first sheath layer and the second sheath layer are tightly adhered together, and the protection effect is good.

Description

Torsion-resistant cable for 66kV fan power transmission and preparation method and application thereof
Technical Field
The invention relates to the technical field of cable preparation, in particular to the technical field of high-voltage cables, and particularly relates to a torsion-resistant cable for 66kV fan power transmission and a preparation method and application thereof.
Background
Wind power generation has become one of the important ways of generating electricity from renewable resources worldwide, and wind power generation accounts for 16% of the electricity generated from renewable resources worldwide. The sea wind resource has the characteristics of stability and large power generation power, and in recent years, the sea wind power is rapidly developed all over the world.
Offshore wind power is developed to 6-7 MW era from the first 3-4 MW era, then is rapidly promoted to 9-10 MW era, and the capacity of a single machine is further improved in the future. At present, the voltage in the field applied by foreign offshore wind power is increased to 66kV, and compared with 33kV, the number of loops of a fan can be reduced, so that the wiring complexity of the offshore booster station is reduced, even the number of the offshore booster stations is reduced, and the investment and operation and maintenance cost is reduced.
At present, most cable manufacturers at home and abroad produce wind energy anti-torsion cables at the voltage level of 35kV or below. The 66kV voltage class belongs to the high voltage range, and is particularly restricted by a plurality of factors such as raw materials, equipment manufacturing capability, processing conditions, application environment and the like for the rubber sleeve cable for mobile application.
However, the existing cable has the following problems:
(1) the conventional medium and high voltage wind energy torsion-resistant flexible cable generally adopts ethylene propylene rubber insulation and chloroprene rubber sheath, the cable can not meet the performance requirements of no halogen and low smoke, but with the further development of the offshore wind power industry, people have higher and higher requirements on the halogen-free low-smoke cable.
(2) The conventional medium-voltage and high-voltage wind energy torsion-resistant flexible cable has low requirement on oil resistance, only needs to meet mineral oil No. 902, but in the long-term use period of the offshore wind turbine, a large amount of hydraulic oil (brand: Mobildt 13M), gear oil (brand: Tribol1710/320) and transformer oil (brand: Midel7131) are frequently leaked in a cabin, so that the performance of insulating and sheath materials is reduced rapidly, and the service life is shortened.
(3) The conventional high-pressure wind energy torsion-resistant flexible cable has low requirement on torsion resistance, only needs to meet the torsion angle of +/-70 degrees/m, but cannot meet the requirement on large-angle yaw of a large-scale offshore wind turbine along with the further development of offshore wind power.
Therefore, the torsion-resistant cable for 66kV wind turbine power transmission needs to be developed to improve the performance of the existing cable.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a torsion-resistant cable for 66kV fan power transmission, wherein the torsion-resistant cable for 66kV fan power transmission adopts a polyolefin rubber sheath material, and a cable structure is reasonably designed, so that the problems of no halogen, low smoke, aging resistance, special oil type resistance and large torsion angle of a 66kV wind energy torsion-resistant flexible cable for a high-power wind turbine generator set are solved; and by adopting a double-layer co-extrusion technology and controlling process parameters, the requirement of large-angle yawing of a marine large-scale fan can be met, and the method has good practical value and popularization value.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a torsion-resistant cable for 66kV fan power transmission, which sequentially comprises a cable core layer, a wrapping tape, a first sheath layer and a second sheath layer from inside to outside;
the cable core layer comprises a main wire core and a ground wire core;
the main wire core sequentially comprises a first central conductor, a first semi-conductive nylon belt layer, a conductor shielding layer, an ethylene propylene rubber insulating layer and an insulating shielding layer from inside to outside;
the ground wire core sequentially comprises a second central conductor, a second semi-conductive nylon belt layer and a semi-conductive covering layer from inside to outside;
the second sheath layer is made of polyolefin rubber;
the polyolefin rubber comprises the following components in parts by weight:
Figure BDA0002762939950000021
Figure BDA0002762939950000031
according to the torsion-resistant cable for 66kV fan power transmission, the torsion-resistant cable for 66kV fan power transmission adopts the polyolefin rubber sheath material, and the cable structure is reasonably designed, so that the problems of no halogen, low smoke, aging resistance, special oil seed resistance and large torsion angle of a 66kV wind energy torsion-resistant flexible cable for a high-power wind turbine unit are solved; and by adopting a double-layer co-extrusion technology and controlling process parameters, the requirement of large-angle yawing of a marine large-scale fan can be met, and the method has good practical value and popularization value.
The polyolefin rubber is a halogen-free low-smoke polyolefin rubber sheath material, the ethylene-vinyl acetate copolymer is used as a base material, and various auxiliary agents such as an anti-aging agent, a filling material, a crosslinking agent, a vulcanization accelerator and the like are matched, so that the performances of various raw materials are integrated, the advantages are gained, the shortcomings are compensated, and the halogen-free low-smoke polyolefin rubber has excellent performances such as aging resistance, high and low temperature resistance, high strength, salt spray corrosion resistance, hydrolysis resistance, oil resistance and the like.
The polyolefin rubber includes 92 to 105 parts of an ethylene-vinyl acetate copolymer, and may be, for example, 92 parts, 94 parts, 95 parts, 97 parts, 98 parts, 100 parts, 101 parts, 103 parts, 104 parts, or 105 parts, but is not limited to the above-mentioned values, and other values not listed in the above range are also applicable.
The polyolefin rubber contains 3.2 to 4.8 parts of microcrystalline wax, and may be, for example, 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, but not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
The polyolefin rubber contains 3.5 to 4.5 parts of a plasticizer, and may be, 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, but not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
The polyolefin rubber contains 13 to 26 parts of white carbon black, for example, 13 parts, 15 parts, 16 parts, 18 parts, 19 parts, 21 parts, 22 parts, 24 parts, 25 parts or 26 parts, but is not limited to the above-mentioned values, and other values not shown in the above range are also applicable.
The polyolefin rubber contains 80 to 120 parts of magnesium hydroxide, for example, 80 parts, 85 parts, 89 parts, 94 parts, 98 parts, 103 parts, 107 parts, 112 parts, 116 parts, 120 parts, etc., but is not limited to the above-mentioned values, and other values not shown in the above range are also applicable.
The polyolefin rubber contains 8.5 to 11 parts of the elastomer, and may be, for example, 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, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
The polyolefin rubber may contain 2.5 to 3.5 parts of an antioxidant, for example, 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, but not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
The polyolefin rubber may contain 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, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
The polyolefin rubber may contain 1.5 to 2.5 parts of a vulcanization aid, 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, but not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
The polyolefin rubber contains 0.9 to 1.2 parts of a silane coupling agent, for example, 0.9 part, 1 part, 1.1 part or 1.2 parts, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
The polyolefin rubber contains 1.8 to 2.8 parts of stearic acid, and may be, for example, 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, but not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
The polyolefin rubber contains 2.8 to 3.3 parts of abrasion-resistant carbon black, for example, 2.8 parts, 2.9 parts, 3 parts, 3.1 parts, 3.2 parts or 3.3 parts, but not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
According to the invention, stearic acid and magnesium hydroxide are added, wherein stearic acid can improve the processing performance and increase the demoulding effect, and magnesium hydroxide can increase the flame retardant property of the material.
Preferably, the polyolefin rubber comprises the following components in parts by weight:
Figure BDA0002762939950000051
Figure BDA0002762939950000061
further preferably, the polyolefin rubber comprises the following components in parts by weight:
Figure BDA0002762939950000062
preferably, the number of the main cores and the ground cores in the cable core layer is the same.
Preferably, the first central conductor is a soft copper conductor.
Preferably, the second central conductor is a soft copper conductor.
Preferably, the stranded wire layer of the soft copper conductor is twisted in forward and reverse directions.
In order to ensure the service life of the cable, the overall flexibility and torsion resistance of the cable must be improved, wherein the thinner the conductor monofilament diameter is, the better the flexibility is; the stranded wires of the conductor are twisted in the forward and reverse directions, the rope twisting between each layer is also twisted in the forward and reverse directions, and meanwhile, each layer is guaranteed to have smaller twisting distance (the outermost layer twisting distance is not more than 10 times, the secondary outer layer is not more than 12 times, and the like), and the better flexibility and torsion resistance are.
Preferably, the ratio of the strand lay length to the strand outer diameter of the outermost layer of the soft copper conductor is less than or equal to 10, and can be 10, 9.5, 9, 8.5, 8, 7.5, 7 or 6.5, and the like.
The invention ensures that each layer has smaller lay length, the lay length of the outermost layer is not more than 10 times, the lay length of the secondary outer layer is not more than 12 times, and the like.
Preferably, the monofilament diameter of the soft copper conductor is 0.3-0.5 mm, such as 0.3mm, 0.32mm, 0.34mm, 0.35mm, 0.36mm, 0.38mm, 0.4mm, 0.401mm, 0.45mm, 0.5mm, and preferably 0.401 mm.
Preferably, semiconductive filler is filled between gaps of the main core and the ground core in the cable core layer.
Preferably, the semiconductive filler is an HBD semiconductive center-fill structure.
Preferably, the ethylene propylene rubber insulating layer is an ethylene propylene diene monomer insulating layer.
Preferably, the first sheath layer is a polyolefin rubber sheath layer.
Preferably, the first sheath layer is made of the same material as the second sheath layer.
Preferably, the plasticizer is dioctyl sebacate.
Preferably, the elastomer is a polyolefin-based elastomer.
Preferably, the polyolefin-based elastomer comprises a combination of any one or at least two of an ethylene-octene copolymer, an ethylene-butene copolymer, or an ethylene-hexene copolymer, wherein typical but non-limiting combinations are: a combination of an ethylene-octene copolymer and an ethylene-butene copolymer, a combination of an ethylene-hexene copolymer and an ethylene-butene copolymer, and a combination of an ethylene-hexene copolymer and an ethylene-octene copolymer.
Preferably, the anti-aging agent is anti-aging agent XH-3.
Preferably, the sulfurizing agent is dicumyl peroxide.
Preferably, the vulcanization aid is triallyl isocyanurate.
Preferably, the silane coupling agent is A-172.
Preferably, the wear resistant carbon black is carbon black N-330.
In a second aspect, the invention provides a method for preparing the torsion-resistant cable for 66kV wind turbine power transmission, which includes the following steps:
(1) twisting the soft copper conductor to respectively manufacture a first central conductor and a second central conductor;
sequentially wrapping a first electric nylon belt layer, a conductor shielding layer, an ethylene propylene rubber insulating layer and an insulating shielding layer outside the first semi-conductor, and performing three-layer co-extrusion to obtain a main wire core;
sequentially wrapping a second electric nylon tape layer and a semi-conductive covering layer outside the second semiconductor to obtain a ground wire core;
(2) filling gaps in the center of the main wire core with semi-conductive fillers, and wrapping the cabled main wire core and the ground wire core by using a wrapping tape;
(3) and sequentially filling a first sheath layer material and a second sheath layer material on the outer side of the wrapped wrapping tape, and performing double-layer co-extrusion to obtain the torsion-resistant cable for power transmission of the 66kV fan.
According to the preparation method of the cable, the cable which is flexible and meets the requirements of halogen-free performance, low-smoke performance and oil resistance can be prepared, the service life of the cable is greatly prolonged, and the preparation method of the cable can be suitable for the torsion-resistant cable for power transmission of the offshore high-power wind power 66kV fan.
Preferably, the soft copper conductor is twisted in the step (1) by positive and negative twisting.
Preferably, the soft copper conductor adopts a 5 th round stranded soft copper conductor specified by GB/T3956 standard.
The conductor is smooth in surface, has no damage to insulating burrs, sharp edges and single raised or broken wires by adopting a 5 th round stranded soft copper conductor specified by GB/T3956 standard.
Preferably, the conductor shielding layer adopts 66kV semiconductive inner screen material with the performance meeting the regulation of IEC60840 standard.
Preferably, the ethylene propylene rubber insulating layer is made of an ethylene propylene rubber insulating material with the performance meeting the IEC60840 standard.
Preferably, the insulation shielding layer adopts a non-strippable semi-conductive outer screen material.
Preferably, the performance of the insulation shielding layer conforms to the specification of IEC60840 standard.
Preferably, the semiconductive coating is an HBD semiconductive coating.
The HBD semi-conductive covering layer is extruded on the outer surface of the semi-conductive nylon belt to play a role in electrically connecting the main wire core conductor and the ground wire core conductor.
Preferably, the temperature of the three-layer co-extrusion in step (1) is 102 to 108 ℃, for example, 102 ℃, 102.7 ℃, 103.4 ℃, 104 ℃, 104.7 ℃, 105.4 ℃, 106 ℃, 106.7 ℃, 107.4 ℃ or 108 ℃, etc., but not limited to the recited values, and other values not recited in the range are also applicable.
The extrusion temperature is controlled to be 105 +/-5 ℃, the surface is not smooth and fine or the inner shielding degumming can be caused when the temperature is too low, and the outer shielding degumming or the insulating rubber material is burnt when the temperature is too high. Therefore, the extrusion temperature control system requires precision and constancy.
Preferably, the vapor pressure of the three-layer coextrusion is 1.0 to 1.5MPa, and for example, it may be 0.5MPa, 0.52MPa, 0.55MPa, 0.6MPa, 0.67MPa, 0.7MPa, 0.72MPa, 0.75MPa, 0.78MPa or 0.8MPa, but not limited to the values listed, and other values not listed in this range are also applicable.
Preferably, the linear speed of the three-layer co-extrusion is 2.3-2.6 m/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, but not limited to the values listed, and other values not listed in this range are equally applicable.
Preferably, the water level of the three-layer co-extrusion is controlled to be 25-38%, for example, 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 values listed, and other values not listed in the range are also applicable.
The ethylene propylene rubber insulating material has high ethylene content and insufficient vulcanization, secondary vulcanization deformation is easily caused, when high-pressure steam is vulcanized in a sulfur connecting pipe, the steam pressure is determined according to the performance test results of extrusion speed, the crosslinking degree of the insulating material and the like, the steam pressure is determined to be 1.0-1.5 MPa, the linear speed is 2.3-2.6 m/min, the water level is controlled to be 25-38%, the preferred steam pressure is 1.2MPa, the linear speed is 2.5m/min and the water level is controlled to be 33%, the mechanical performance meets the product requirements, and the insulation deformation is obviously improved during secondary vulcanization.
Preferably, thousands of purification-grade purification rooms are adopted in the process of filling the second sheath material.
Impurity control of the high-voltage ethylene propylene rubber insulating material in the using process is critical firstly for cleaning production equipment and a production site, a feeding system adopts a thousand-level purification room, a blanking system adopts a gravity automatic blanking system, and each part of an extruder, particularly an extruder head, must be cleaned before a production line produces a high-voltage cable, so that impurities are prevented from being mixed into the high-voltage ethylene propylene rubber insulating material. When the material is used, the processes of unpacking, pouring or sucking and conveying the material are strictly controlled to avoid the entry of impurities.
Preferably, the semiconductive filler in step (2) is an HBD semiconductive center-fill structure.
Preferably, the second sheath layer in step (3) is a polyolefin rubber.
Preferably, the preparation method of the polyolefin rubber comprises the following steps:
(1') carrying out primary mixing on the ethylene-vinyl acetate copolymer and the elastomer to obtain a primary mixed material;
(2 ') adding microcrystalline wax, a plasticizer, white carbon black, magnesium hydroxide, an anti-aging agent, a silane coupling agent, stearic acid and wear-resistant carbon black into the primary mixed material in the step (1') for secondary mixing to obtain a secondary mixed material;
(3 ') adding a vulcanizing agent and an auxiliary vulcanizing agent triallyl isocyanurate into the secondary mixed material obtained in the step (2'), and mixing for three times to obtain a mixed rubber material;
(4 ') after the mixed rubber material in the step (3') is thinly passed through and arranged on an open mill, sequentially passing through a three-roll calender for strip opening and a cooling roll for cooling, and then passing through a talcum powder box to obtain the polyolefin rubber.
Preferably, the machine for one-time mixing in the step (1') is an internal mixer.
Preferably, the temperature of the first kneading is 40 to 50 ℃, for example, 40 ℃, 42 ℃, 43 ℃, 44 ℃, 45 ℃, 46 ℃, 47 ℃, 48 ℃, 49 ℃ or 50 ℃, but not limited to the recited values, and other values not recited in the range are also applicable.
Preferably, the time for the primary kneading is 5 to 6min, and may be, for example, 5min, 5.2min, 5.3min, 5.4min, 5.5min, 5.6min, 5.7min, 5.8min, 5.9min or 6min, but is not limited to the above-mentioned values, and other values not mentioned in this range are also applicable.
Preferably, the temperature of the secondary kneading in the step (2') is 40 to 50 ℃, for example, 40 ℃, 42 ℃, 43 ℃, 44 ℃, 45 ℃, 46 ℃, 47 ℃, 48 ℃, 49 ℃ or 50 ℃, etc., but not limited to the recited values, and other values not recited in the range are also applicable.
Preferably, the time for the secondary kneading is 2 to 3min, and may be, for example, 2min, 2.2min, 2.3min, 2.4min, 2.5min, 2.6min, 2.7min, 2.8min, 2.9min or 3min, but is not limited to the above-mentioned values, and other values not mentioned in this range are also applicable.
Preferably, the temperature of the third kneading in the step (3') is 40 to 50 ℃, for example, 40 ℃, 42 ℃, 43 ℃, 44 ℃, 45 ℃, 46 ℃, 47 ℃, 48 ℃, 49 ℃ or 50 ℃, but not limited to the recited values, and other values not recited in the range are also applicable.
Preferably, the time for the three-time kneading is 0.5 to 1.5min, and for example, may be 0.5min, 0.7min, 0.8min, 0.9min, 1min, 1.1min, 1.2min, 1.3min, 1.4min or 1.5min, but is not limited to the values listed above, and other values not listed in this range are also applicable.
Preferably, the number of thin passes in step (4') is 1 to 2, and may be 1 or 2, for example.
Preferably, the number of times of glue swinging is 2-3, for example, 2 or 3 times.
In a third aspect, the invention provides the use of the torsion-resistant cable for power transmission of the 66kV wind turbine in the 66kV circuit for the wind turbine.
Preferably, the working temperature of the cable is-40 to 60 ℃, for example, -40 ℃, -30 ℃, -20 ℃, -10 ℃, 0 ℃, 10 ℃, 20 ℃, 30 ℃, 40 ℃, 50 ℃ or 60 ℃ and the like.
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 the high-power wind turbine generator, the cable structure is reasonably designed, a proper processing technology is formulated, the power transmission and the use performance (the working temperature is between-40 ℃ and +60 ℃) of the cable under a normal working environment are met, the problems of halogen-free, low smoke, ageing resistance, special oil resistance, large torsion angle and the like of the 66kV wind-energy torsion-resistant flexible cable for the high-power wind turbine generator are solved, and the oil-resistant halogen-free low-smoke polyolefin rubber sheath material has good practical value and popularization value.
Compared with the prior art, the invention has at least the following beneficial effects:
(1) the torsion-resistant cable for 66kV fan power transmission provided by the invention can resist torsion softness, has the advantages of no halogen, low smoke, aging resistance, special oil type resistance, large torsion angle resistance and the like, and has tensile strength of more than or equal to 9.7N/mm after aging2The elongation at break is more than or equal to 110 percent, the change rate of the tensile strength after oil immersion is more than or equal to-18 percent, the change rate of the elongation at break is more than or equal to-20 percent, the performance is excellent, and the application prospect is wide;
(2) the torsion-resistant cable for power transmission of the 66kV fan can be suitable for a 66kV wind energy circuit for an offshore high-power wind turbine unit, and the problem that the existing cable cannot meet the requirement of large-angle yaw of the offshore large fan is solved;
(3) the preparation method of the torsion-resistant cable for 66kV fan power transmission comprehensively selects specific polyolefin rubber materials, adopts three-layer co-extrusion and double-layer co-extrusion processes, and further combines a soft copper conductor stranding process to prepare the torsion-resistant flexible cable with excellent performance.
Drawings
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.
In the figure: 1-a first central conductor; 2-a first semi-conductive nylon tape layer; 3-a conductor shield layer; 4-ethylene propylene rubber insulating layer; 5-insulating shielding layer; 6-a semiconductive filler; 7-wrapping a tape; 8-a first jacket layer; 9-a second jacket layer; 10-a second center conductor; 11-a second semiconductive nylon tape layer; 12-a semiconductive coating.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
First, an embodiment
Example 1
The embodiment provides a torsion-resistant cable for 66kV fan power transmission, as shown in fig. 1, the cable sequentially includes, from inside to outside, a cable core layer, a wrapping tape 7, a first sheath layer 8 and a second sheath layer 9;
the cable core layer comprises a main wire core and a ground wire core; the main wire core sequentially comprises a first central conductor 1, a first semi-conductive nylon belt layer 2, a conductor shielding layer 3, an ethylene propylene rubber insulating layer 4 and an insulating shielding layer 5 from inside to outside; the ground wire core sequentially comprises a second central conductor 10, a second semi-conductive nylon belt layer 11 and a semi-conductive covering layer 12 from inside to outside; the second sheath layer 9 is made of polyolefin rubber; the number of the main wire cores and the number of the ground wire cores in the cable core layer are the same; the first central conductor 1 is a soft copper conductor; the second central conductor 10 is a soft copper conductor; the stranded wire layer of the soft copper conductor is stranded in the forward and reverse directions; the ratio of the strand lay to the strand outer diameter between each layer of strand layers of the soft copper conductor is that the strand lay of the outermost layer is not more than 10 times, the secondary outer layer is not more than 12 times, and so on; the monofilament diameter of the soft copper conductor is 0.401 mm; semi-conductive filler 6 is filled in the gap between the main wire core and the ground wire core in the cable core layer; the semiconductive filler 6 is an HBD semiconductive center filling structure; the ethylene propylene rubber insulating layer 4 is an ethylene propylene diene monomer insulating layer 4; the first sheath layer 8 is a polyolefin rubber sheath layer; the material of the first sheath layer 8 is the same as that of the second sheath layer 9.
The polyolefin rubber comprises the following components in parts by weight:
Figure BDA0002762939950000131
Figure BDA0002762939950000141
the preparation method of the torsion-resistant cable for 66kV fan power transmission comprises the following steps:
(1) twisting the soft copper conductor in a positive and negative twisting mode to respectively manufacture a first central conductor and a second central conductor; the soft copper conductor adopts a 5 th round stranded soft copper conductor specified by GB/T3956 standard;
sequentially wrapping a first electric nylon belt layer, a conductor shielding layer, an ethylene propylene rubber insulating layer and an insulating shielding layer outside the first semi-conductor, and performing three-layer co-extrusion to obtain a main wire core;
sequentially wrapping a second electric nylon tape layer and a semi-conductive covering layer outside the second semiconductor to obtain a ground wire core;
the conductor shielding layer adopts 66kV semi-conductive inner shielding material with the performance meeting the specification of IEC60840 standard; the ethylene propylene rubber insulating layer is made of an ethylene propylene rubber insulating material with the performance meeting the IEC60840 standard; the insulation shielding layer adopts a non-strippable semi-conductive outer screen material; the performance of the insulating shielding layer meets the specification of IEC60840 standard; the semiconductive covering layer is an HBD semiconductive covering layer;
wherein the temperature of the three-layer co-extrusion is 105 ℃, the steam pressure is 1.2MPa, the linear velocity is 2.5m/min, and the water level is controlled at 33%;
(2) filling gaps in the center of the main wire core by adopting an HBD semi-conductive center filling structure, and wrapping the cabled main wire core and the ground wire core by using a wrapping tape;
(3) and sequentially filling a first sheath layer material and a second sheath layer material outside the wrapped wrapping tape in a thousand-level purification grade purification room, and performing double-layer co-extrusion to obtain the torsion-resistant cable for power transmission of the 66kV fan.
The preparation method of the polyolefin rubber of the first sheath layer and the second sheath layer in the step (3) comprises the following steps:
(1') mixing 100 parts of EVM500HV and 9 parts of elastomer POE in an internal mixer at 45 ℃ for 5min, and uniformly mixing;
(2') adding 3.5 parts of microcrystalline wax, 4.0 parts of dioctyl sebacate, 15 parts of white carbon black, 100 parts of magnesium hydroxide, XH-33.0 parts of anti-aging agent, A-1721.0 parts, 2.0 parts of stearic acid and N-3303.0 parts of wear-resistant carbon black into the internal mixer, and mixing for 2 min;
(3') 4.2 parts of the vulcanizing agent dicumyl peroxide (DCP) and 1.8 parts of auxiliary vulcanizing agent triallyl isocyanurate (TMPTMA) are added into the internal mixer finally, and mixed for 1min, and then mixed rubber materials are discharged;
(4') thinly passing the mixed rubber material on an open mill for 2 times, simultaneously swinging the rubber for 3 times, slitting and discharging the rubber material on a three-roll calender, cooling the output rubber sheet by a cooling roll, and passing the cooled rubber sheet through a talcum powder box to obtain the polyolefin rubber.
Example 2
The embodiment provides a torsion-resistant cable for power transmission of a 66kV fan, which sequentially comprises a cable core layer, a wrapping tape, a first sheath layer and a second sheath layer from inside to outside;
the cable core layer comprises a main wire core and a ground wire core; the main wire core sequentially comprises a first central conductor, a first semi-conductive nylon belt layer, a conductor shielding layer, an ethylene propylene rubber insulating layer and an insulating shielding layer from inside to outside; the ground wire core sequentially comprises a second central conductor, a second semi-conductive nylon belt layer and a semi-conductive covering layer from inside to outside; the second sheath layer is made of polyolefin rubber; the number of the main wire cores and the number of the ground wire cores in the cable core layer 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 of the soft copper conductor is stranded in the forward and reverse directions; the ratio of the strand lay to the strand outer diameter between each layer of strand layers of the soft copper conductor is that the strand lay of the outermost layer is not more than 10 times, the secondary outer layer is not more than 12 times, and so on; the monofilament diameter of the soft copper conductor is 0.401 mm; semi-conductive filler is filled in the gap between the main wire core and the ground wire core in the cable core layer; the semiconductive filler is an HBD semiconductive center filling structure; the ethylene propylene rubber insulating layer is an ethylene propylene diene monomer insulating layer; the first sheath layer is a polyolefin rubber sheath layer; the first sheath layer is made of the same material as the second sheath layer.
The polyolefin rubber comprises the following components in parts by weight:
Figure BDA0002762939950000161
the preparation method of the torsion-resistant cable for 66kV fan power transmission comprises the following steps:
(1) twisting the soft copper conductor in a positive and negative twisting mode to respectively manufacture a first central conductor and a second central conductor; the soft copper conductor adopts a 5 th round stranded soft copper conductor specified by GB/T3956 standard;
sequentially wrapping a first electric nylon belt layer, a conductor shielding layer, an ethylene propylene rubber insulating layer and an insulating shielding layer outside the first semi-conductor, and performing three-layer co-extrusion to obtain a main wire core;
wherein the temperature of the three-layer co-extrusion is 102 ℃, the steam pressure is 1.0MPa, the linear velocity is 2.3m/min, and the water level is controlled at 25 percent;
sequentially wrapping a second electric nylon tape layer and a semi-conductive covering layer outside the second semiconductor to obtain a ground wire core;
the conductor shielding layer adopts 66kV semi-conductive inner shielding material with the performance meeting the specification of IEC60840 standard; the ethylene propylene rubber insulating layer is made of an ethylene propylene rubber insulating material with the performance meeting the IEC60840 standard; the insulation shielding layer adopts a non-strippable semi-conductive outer screen material; the performance of the insulating shielding layer meets the specification of IEC60840 standard; the semiconductive covering layer is an HBD semiconductive covering layer;
(2) filling gaps in the center of the main wire core by adopting an HBD semi-conductive center filling structure, and wrapping the cabled main wire core and the ground wire core by using a wrapping tape;
(3) sequentially filling a first sheath layer material and a second sheath layer material on the outer side of the wrapped wrapping tape in a thousand-level purification room, and performing double-layer co-extrusion to obtain the torsion-resistant cable for power transmission of the 66kV fan;
the preparation method of the polyolefin rubber of the first sheath layer and the second sheath layer in the step (3) comprises the following steps:
(1') mixing 500HV92 parts of EVM and 11 parts of POE elastomer in an internal mixer at 50 ℃ for 6min, and uniformly mixing;
(2') adding 4.8 parts of microcrystalline wax, 4.5 parts of dioctyl sebacate, 26 parts of white carbon black, 80 parts of magnesium hydroxide, 33.5 parts of anti-aging agent XH-33.5, A-1720.9 parts, 2.8 parts of stearic acid and 3min of wear-resistant carbon black N-3302.8 parts into the internal mixer for mixing;
(3') adding 3.5 parts of dicumyl peroxide (DCP) serving as a vulcanizing agent and 2.5 parts of triallyl isocyanurate (TMPTMA) serving as a co-vulcanizing agent into the internal mixer finally, mixing for 2min, and discharging mixed rubber;
(4') thinly passing the mixed rubber material on an open mill for 1 time, simultaneously swinging the rubber for 2 times, slitting and discharging the rubber material on a three-roll calender, cooling the output rubber sheet by a cooling roll, and passing the cooled rubber sheet through a talcum powder box to obtain the polyolefin rubber.
Example 3
The embodiment provides a torsion-resistant cable for power transmission of a 66kV fan, which sequentially comprises a cable core layer, a wrapping tape, a first sheath layer and a second sheath layer from inside to outside;
the cable core layer comprises a main wire core and a ground wire core; the main wire core sequentially comprises a first central conductor, a first semi-conductive nylon belt layer, a conductor shielding layer, an ethylene propylene rubber insulating layer and an insulating shielding layer from inside to outside; the ground wire core sequentially comprises a second central conductor, a second semi-conductive nylon belt layer and a semi-conductive covering layer from inside to outside; the second sheath layer is made of polyolefin rubber; the number of the main wire cores and the number of the ground wire cores in the cable core layer 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 of the soft copper conductor is stranded in the forward and reverse directions; the ratio of the strand lay to the strand outer diameter between each layer of strand layers of the soft copper conductor is that the strand lay of the outermost layer is not more than 10 times, the secondary outer layer is not more than 12 times, and so on; the monofilament diameter of the soft copper conductor is 0.401 mm; semi-conductive filler is filled in the gap between the main wire core and the ground wire core in the cable core layer; the semiconductive filler is an HBD semiconductive center filling structure; the ethylene propylene rubber insulating layer is an ethylene propylene diene monomer insulating layer; the first sheath layer is a polyolefin rubber sheath layer; the first sheath layer is made of the same material as the second sheath layer.
The polyolefin rubber comprises the following components in parts by weight:
Figure BDA0002762939950000181
Figure BDA0002762939950000191
the preparation method of the torsion-resistant cable for 66kV fan power transmission comprises the following steps:
(1) twisting the soft copper conductor in a positive and negative twisting mode to respectively manufacture a first central conductor and a second central conductor; the soft copper conductor adopts a 5 th round stranded soft copper conductor specified by GB/T3956 standard;
sequentially wrapping a first electric nylon belt layer, a conductor shielding layer, an ethylene propylene rubber insulating layer and an insulating shielding layer outside the first semi-conductor, and performing three-layer co-extrusion to obtain a main wire core;
wherein the temperature of the three-layer co-extrusion is 108 ℃, the steam pressure is 1.0MPa, the linear velocity is 2.6m/min, and the water level is controlled at 38%;
sequentially wrapping a second electric nylon tape layer and a semi-conductive covering layer outside the second semiconductor to obtain a ground wire core;
the conductor shielding layer adopts 66kV semi-conductive inner shielding material with the performance meeting the specification of IEC60840 standard; the ethylene propylene rubber insulating layer is made of an ethylene propylene rubber insulating material with the performance meeting the IEC60840 standard; the insulation shielding layer adopts a non-strippable semi-conductive outer screen material; the performance of the insulating shielding layer meets the specification of IEC60840 standard; the semiconductive covering layer is an HBD semiconductive covering layer;
(2) filling gaps in the center of the main wire core by adopting an HBD semi-conductive center filling structure, and wrapping the cabled main wire core and the ground wire core by using a wrapping tape;
(3) and sequentially filling a first sheath layer material and a second sheath layer material outside the wrapped wrapping tape in a thousand-level purification grade purification room, and performing double-layer co-extrusion to obtain the torsion-resistant cable for power transmission of the 66kV fan.
The preparation method of the polyolefin rubber of the first sheath layer and the second sheath layer in the step (3) comprises the following steps:
(1') mixing 500HV105 parts of EVM and 8.5 parts of POE (polyolefin elastomer) in an internal mixer at 40 ℃ for 5.5min, and uniformly mixing;
(2') adding 3.2 parts of microcrystalline wax, 3.5 parts of dioctyl sebacate, 13 parts of white carbon black, 120 parts of magnesium hydroxide, XH-32.5 parts of anti-aging agent, A-1720.9 parts, 2.8 parts of stearic acid and N-3303.3 parts of wear-resistant carbon black into the internal mixer, and mixing for 1.5 min;
(3') 4.5 parts of the vulcanizing agent dicumyl peroxide (DCP) and 1.5 parts of auxiliary vulcanizing agent triallyl isocyanurate (TMPTMA) are added into the internal mixer finally, and are mixed for 1min, and then mixed rubber materials are discharged;
(4') thinly passing the mixed rubber material on an open mill for 2 times, simultaneously swinging the rubber for 2 times, slitting and discharging the sheet on a three-roll calender, cooling the output rubber sheet by a cooling roll, and passing the cooled rubber sheet through a talcum powder box to obtain the polyolefin rubber.
Example 4
The embodiment provides a torsion-resistant cable for 66kV fan power transmission, and the cable is the same as the cable in the embodiment 1 except that the temperature of the three-layer co-extrusion in the step (1) is 95 ℃.
Example 5
The embodiment provides a torsion-resistant cable for 66kV fan power transmission, which is the same as the cable in the embodiment 1 except that the temperature of the three-layer co-extrusion in the step (1) is 115 ℃.
Example 6
The embodiment provides a torsion-resistant cable for 66kV fan power transmission, which is the same as that in the embodiment 1 except that the temperature of the three-layer co-extrusion in the step (1) is 108 ℃.
Example 7
The embodiment provides a torsion-resistant cable for 66kV fan power transmission, which is the same as the cable in the embodiment 1 except that the temperature of the three-layer co-extrusion in the step (1) is 102 ℃.
The co-extrusion temperatures of the embodiments 6 and 7 are 108 ℃ and 102 ℃, respectively, compared with the co-extrusion temperatures of 95 ℃ and 115 ℃ in the embodiments 4 and 5, the cables obtained by co-extrusion in the embodiments 6 and 7 have smooth and fine surfaces, and do not have the degumming phenomenon of the conductor shielding layer, the ethylene propylene rubber insulating layer or the insulating shielding layer, but have rough surfaces and the degumming phenomenon of the ethylene propylene rubber insulating layer in the embodiment 4, and the degumming phenomenon of the insulating shielding layer in the embodiment 5, so that the invention has the advantage that the degumming phenomenon is effectively prevented by adopting the three-layer co-extrusion temperature of 102-108 ℃.
Example 8
The embodiment provides a torsion-resistant cable for 66kV fan power transmission, which is the same as the cable in the embodiment 1 except that the steam pressure of the three-layer co-extrusion in the step (1) is 1.0 MPa.
Example 9
The embodiment provides a torsion-resistant cable for 66kV fan power transmission, which is the same as the cable in the embodiment 1 except that the steam pressure of the three-layer co-extrusion in the step (1) is 1.5 MPa.
Example 10
The embodiment provides a torsion-resistant cable for 66kV fan power transmission, which is the same as the cable in the embodiment 1 except that the steam pressure of the three-layer co-extrusion in the step (1) is 0.5 MPa.
Example 11
The embodiment provides a torsion-resistant cable for 66kV fan power transmission, which is the same as the cable in the embodiment 1 except that the steam pressure of the three-layer co-extrusion in the step (1) is 2.0 MPa.
The steam pressure of the co-extrusion in the embodiments 8-9 is 1.0MPa and 1.5MPa respectively, compared with the steam pressure of the co-extrusion in the embodiments 10 and 11 is 0.5MPa and 2.0MPa respectively, the ethylene propylene rubber insulating material in the cable obtained by the co-extrusion in the embodiments 8 and 9 is fully vulcanized and matched with the co-extrusion temperature, the mechanical property meets the product requirement, and the insulating deformation phenomenon during the secondary vulcanization is obviously improved, thereby showing that the invention improves the performance of the cable by adopting the steam pressure of the three-layer co-extrusion of 1.0-1.5 MPa and matching with the temperature of 102-108 ℃. Example 12
The embodiment provides a torsion-resistant cable for 66kV fan power transmission, and the cable is the same as the cable in embodiment 1 except that the linear speed of three-layer co-extrusion in step (1) is 1.8 m/min.
Example 13
The embodiment provides a torsion-resistant cable for 66kV fan power transmission, and the cable is the same as the cable in the embodiment 1 except that the linear speed of the three-layer co-extrusion in the step (1) is 3.5 m/min.
Compared with the examples 12 and 13, the cable of the invention has better mechanical properties and better vulcanization effect, and has no vulcanization deformation phenomenon in the example 1, while the vulcanization deformation phenomenon in the examples 12 and 13 shows that the cable of the invention has improved performance by controlling specific linear speed.
Example 14
This example provides a torsion resistant cable for 66kV wind turbine transmission, which is the same as example 1 except that "triallyl isocyanurate" is replaced with "trimethylolpropane trimethacrylate" in the polyolefin rubber. Second, comparative example
Comparative example 1
This comparative example provides a torsion-resistant cable for 66kV wind turbine transmission, which is the same as example 1 except that 60 parts of magnesium hydroxide is present in the polyolefin rubber.
Comparative example 2
This comparative example provides a torsion-resistant cable for 66kV wind turbine transmission, which is the same as example 1 except that 130 parts of magnesium hydroxide is present in the polyolefin rubber.
Comparative example 3
This comparative example provides a torsion-resistant cable for 66kV wind turbine transmission, which is the same as example 1 except that 1.2 parts of stearic acid in the polyolefin rubber.
Comparative example 4
This comparative example provides a torsion-resistant cable for 66kV wind turbine transmission, which is the same as example 1 except that 3.5 parts of stearic acid in the polyolefin rubber.
Comparative example 5
This comparative example provides a torsion resistant cable for 66kV wind turbine transmission, which is the same as example 1 except that triallyl isocyanurate is 1.0 part in the polyolefin rubber.
Comparative example 6
This comparative example provides a torsion resistant cable for 66kV wind turbine transmission, which is the same as example 1 except that triallyl isocyanurate is 3.2 parts in the polyolefin rubber.
Third, test and results
Taking example 1 as an example, the polyolefin rubber prepared by the method is subjected to various performance tests by testing equipment such as an electronic universal tester, a shore durometer, a thermal conductivity tester, a low-temperature impact tester, a volume resistivity tester, an alternating current medium strength tester and the like, and the specific test method adopts GB/T528-2009, GB/T2941-2006 and GB/T2951-2008; the ethylene propylene rubber insulation layer of comparative example 1 was tested in the same manner, and the test conditions are shown in table 1.
TABLE 1
Figure BDA0002762939950000231
Figure BDA0002762939950000241
The polyolefin rubbers of the other examples and comparative examples were tested for their properties using the test methods and conditions in Table 1 for example 1, and the test results are shown in Table 2.
TABLE 2
Figure BDA0002762939950000251
Figure BDA0002762939950000261
The following points can be seen from tables 1-2:
(1) as can be seen from the comprehensive examples 1-4, the torsion-resistant cable for 66kV fan power transmission provided by the invention adopts a specific polyolefin rubber sheath material, and the tensile strength of the cable after aging is more than or equal to 9.7N/mm2Elongation at break not less than 110%, tensile strength after oil immersionThe strength change rate is more than or equal to-18 percent, the elongation at break change rate is more than or equal to-20 percent, and the rubber has the advantages of good aging resistance and special oil resistance;
(2) as can be seen by combining example 1 and comparative examples 1 to 2, the magnesium hydroxide of 100 parts in example 1 did not significantly deteriorate after aging in example 1 as compared with 60 parts and 130 parts of magnesium hydroxide of comparative example 1 and comparative example 2, respectively, while the tensile strength after aging in comparative examples 1 and 2 was from 12.3N/mm2Down to 5.8N/mm2And from 14.1N/mm2Down to 4.3N/mm2Therefore, the aging resistance of the polyolefin rubber sheath is improved by setting the addition amount of the magnesium hydroxide within a specific range; it can be seen from the comprehensive examples 1 and the comparative examples 3 to 4 that the anti-aging performance of the polyolefin rubber sheath is improved by setting the addition amount of stearic acid within a specific range; it can be seen from the comprehensive examples 1 and the comparative examples 5 to 6 that the anti-aging performance of the polyolefin rubber sheath is improved by setting the addition amount of triallyl isocyanurate in the polyolefin rubber within a specific range; therefore, the magnesium hydroxide, the triallyl isocyanurate and the stearic acid are comprehensively added, so that the magnesium hydroxide, the triallyl isocyanurate and the stearic acid are mutually synergistic and mutually promoted, and the ageing resistance of the polyolefin rubber sheath is improved;
(3) it can be seen from the combination of example 1 and example 14 that the addition of triallyl isocyanurate in example 1 results in a decrease in the aging resistance compared to the addition of trimethylolpropane trimethacrylate in example 14, thus indicating that the aging resistance of the polyolefin rubber sheathing is improved by the addition of triallyl isocyanurate as a vulcanization aid in the present invention.
In conclusion, the torsion-resistant cable for 66kV fan power transmission provided by the invention adopts the polyolefin rubber sheath material, the cable structure is reasonably designed, and the problems of no halogen, low smoke, aging resistance, special oil seed resistance and large torsion angle of the 66kV wind energy torsion-resistant flexible cable for the high-power wind turbine generator set are solved; the requirement of large-angle yawing of a large-scale offshore fan can be met, and the device has good practical value and popularization value.
The applicant declares that 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 be implemented depending on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims (10)

1. A torsion-resistant cable for power transmission of a 66kV fan is characterized by comprising a cable core layer, a wrapping tape, a first sheath layer and a second sheath layer in sequence from inside to outside;
the cable core layer comprises a main wire core and a ground wire core;
the main wire core sequentially comprises a first central conductor, a first semi-conductive nylon belt layer, a conductor shielding layer, an ethylene propylene rubber insulating layer and an insulating shielding layer from inside to outside;
the ground wire core sequentially comprises a second central conductor, a second semi-conductive nylon belt layer and a semi-conductive covering layer from inside to outside;
the second sheath layer is made of polyolefin rubber;
the polyolefin rubber comprises the following components in parts by weight:
Figure FDA0002762939940000011
2. the torsion-resistant cable for 66kV wind turbine power transmission according to claim 1, wherein the number of main cores and ground cores in the cable core layer is the same;
preferably, the first central conductor is a soft copper conductor;
preferably, the second central conductor is a soft copper conductor;
preferably, the stranded wire layer of the soft copper conductor is stranded in forward and reverse directions;
preferably, the ratio of the strand lay length to the strand outer diameter of the outermost layer of the soft copper conductor is less than or equal to 10;
preferably, a semiconductive filler is filled between gaps of the main core and the ground core in the cable core layer;
preferably, the semiconductive filler is an HBD semiconductive center-fill structure;
preferably, the ethylene propylene rubber insulating layer is an ethylene propylene diene monomer insulating layer;
preferably, the first sheath layer is a polyolefin rubber sheath layer;
preferably, the first sheath layer is made of the same material as the second sheath layer.
3. The torsion-resistant cable for 66kV wind turbine transmission according to claim 1 or 2, wherein the plasticizer is dioctyl sebacate;
preferably, the elastomer is a polyolefin elastomer;
preferably, the polyolefin elastomer comprises a combination of at least two of any one of an ethylene-octene copolymer, an ethylene-butene copolymer, or an ethylene-hexene copolymer;
preferably, the anti-aging agent is anti-aging agent XH-3;
preferably, the vulcanizing agent is dicumyl peroxide;
preferably, the vulcanization aid is triallyl isocyanurate;
preferably, the silane coupling agent is A-172;
preferably, the wear resistant carbon black is carbon black N-330.
4. The preparation method of the torsion-resistant cable for 66kV wind turbine power transmission according to any one of claims 1 to 3, wherein the method comprises the following steps:
(1) twisting the soft copper conductor to respectively manufacture a first central conductor and a second central conductor;
sequentially wrapping a first electric nylon belt layer, a conductor shielding layer, an ethylene propylene rubber insulating layer and an insulating shielding layer outside the first semi-conductor, and performing three-layer co-extrusion to obtain a main wire core;
sequentially wrapping a second electric nylon tape layer and a semi-conductive covering layer outside the second semiconductor to obtain a ground wire core;
(2) filling gaps in the center of the main wire core with semi-conductive fillers, and wrapping the cabled main wire core and the ground wire core by using a wrapping tape;
(3) and sequentially filling a first sheath layer material and a second sheath layer material on the outer side of the wrapped wrapping tape, and performing double-layer co-extrusion to obtain the torsion-resistant cable for power transmission of the 66kV fan.
5. The preparation method according to claim 4, wherein the soft copper conductor is twisted in the step (1) by positive and negative twisting;
preferably, the soft copper conductor adopts a 5 th round stranded soft copper conductor specified by GB/T3956 standard;
preferably, the conductor shielding layer adopts 66kV semiconductive inner screen material with the performance meeting the specification of IEC60840 standard;
preferably, the ethylene propylene rubber insulating layer is made of an ethylene propylene rubber insulating material with the performance meeting the IEC60840 standard;
preferably, the insulation shielding layer adopts a non-strippable semi-conductive outer screen material;
preferably, the performance of the insulation shielding layer conforms to the specification of IEC60840 standard;
preferably, the semiconductive coating is an HBD semiconductive coating.
6. The preparation method according to claim 4 or 5, characterized in that the temperature of the three-layer co-extrusion in the step (1) is 102-108 ℃;
preferably, the steam pressure of the three-layer co-extrusion is 1.0-1.5 MPa;
preferably, the linear speed of the three-layer co-extrusion is 2.3-2.6 m/min;
preferably, the water level of the three-layer co-extrusion is controlled to be 25-38%;
preferably, thousands of purification-grade purification rooms are adopted in the process of filling the second sheath material.
7. The preparation method according to any one of claims 4 to 6, wherein the semiconductive filler in the step (2) is an HBD semiconductive center-filled structure.
8. The production method according to any one of claims 4 to 7, wherein the second sheath layer in step (3) is a polyolefin rubber;
preferably, the preparation method of the polyolefin rubber comprises the following steps:
(1') carrying out primary mixing on the ethylene-vinyl acetate copolymer and the elastomer to obtain a primary mixed material;
(2 ') adding microcrystalline wax, a plasticizer, white carbon black, magnesium hydroxide, an anti-aging agent, a silane coupling agent, stearic acid and wear-resistant carbon black into the primary mixed material in the step (1') for secondary mixing to obtain a secondary mixed material;
(3 ') adding a vulcanizing agent and an auxiliary vulcanizing agent triallyl isocyanurate into the secondary mixed material obtained in the step (2'), and mixing for three times to obtain a mixed rubber material;
(4 ') after the mixed rubber material in the step (3') is thinly passed through and arranged on an open mill, sequentially passing through a three-roll calender for strip opening and a cooling roll for cooling, and then passing through a talcum powder box to obtain the polyolefin rubber.
9. The production method according to any one of claims 4 to 7, wherein the primary mixing machine in step (1') is an internal mixer;
preferably, the temperature of the primary mixing is 40-50 ℃;
preferably, the time for primary mixing is 5-6 min;
preferably, the temperature of the secondary mixing in the step (2') is 40-50 ℃;
preferably, the time for the secondary mixing is 2-3 min;
preferably, the temperature of the three times of mixing in the step (3') is 40-50 ℃;
preferably, the time for three times of mixing is 0.5-1.5 min;
preferably, the number of thin passes in the step (4') is 1-2;
preferably, the number of times of glue swinging is 2-3.
10. Use of the torsion-resistant cable for 66kV wind turbine transmission according to any one of claims 1 to 3 in a 66kV circuit for a wind turbine;
preferably, the working temperature of the cable is-40-60 ℃.
CN202011223673.5A 2020-11-05 2020-11-05 Torsion-resistant cable for 66kV fan power transmission and preparation method and application thereof Pending CN112435787A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202011223673.5A CN112435787A (en) 2020-11-05 2020-11-05 Torsion-resistant cable for 66kV fan power transmission and preparation method and application thereof
PCT/CN2020/128240 WO2022095093A1 (en) 2020-11-05 2020-11-12 66 kv torsion-resistant cable for wind turbine power transmission, and preparation method therefor and use thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011223673.5A CN112435787A (en) 2020-11-05 2020-11-05 Torsion-resistant cable for 66kV fan power transmission and preparation method and application thereof

Publications (1)

Publication Number Publication Date
CN112435787A true CN112435787A (en) 2021-03-02

Family

ID=74696582

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011223673.5A Pending CN112435787A (en) 2020-11-05 2020-11-05 Torsion-resistant cable for 66kV fan power transmission and preparation method and application thereof

Country Status (2)

Country Link
CN (1) CN112435787A (en)
WO (1) WO2022095093A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023040054A1 (en) * 2021-09-16 2023-03-23 江苏上上电缆集团有限公司 Method for manufacturing ethylene propylene-insulated low-smoke halogen-free torsion-resistant medium-pressure wind power cable, and cable
CN116120658A (en) * 2022-12-29 2023-05-16 江苏亨通电力电缆有限公司 Mould-resistant halogen-free rubber sheath material and cable bridge cable comprising same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116987347A (en) * 2023-07-31 2023-11-03 特变电工山东鲁能泰山电缆有限公司 Cable insulation material for offshore wind power generation, preparation method of cable insulation material and cable for offshore wind power generation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4036476A1 (en) * 1990-02-13 1991-08-14 Siemens Ag Flexible electrical cable for supplying lifting crane magnet - has intermediate packing between cable wires and enclosing rubber mantle
CN104327366A (en) * 2014-10-16 2015-02-04 马弗橡胶（镇江）有限公司 Weather-proof type halogen-free flame-retardation cable sheath material formula used for locomotive and preparation method thereof
CN109265813A (en) * 2018-09-14 2019-01-25 成都营门电缆有限责任公司 A kind of marine inflaming-retarding cable jacket material of salt spray proof and preparation method thereof
CN110690003A (en) * 2019-11-05 2020-01-14 远东电缆有限公司 66kV wind power high-voltage torsion cable and production process thereof
CN111834041A (en) * 2020-08-18 2020-10-27 江苏亨通电力电缆有限公司 Urban rail transit pulls B for power supply system135 kV-level ring network cable

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170107827A (en) * 2016-03-16 2017-09-26 삼성전자주식회사 Cable including shield sheath
CN206163180U (en) * 2016-11-14 2017-05-10 江苏中煤电缆有限公司 Low smoke and zero halogen is mining, and flexible cable is overlapped to shielding rubber
CN208861716U (en) * 2018-10-16 2019-05-14 江苏亨通电力电缆有限公司 Ironed wall-shaped distortion-resisting power cable in 6MW offshore wind farm unit use
CN110718335A (en) * 2019-10-08 2020-01-21 江苏上上电缆集团有限公司 Manufacturing method of thin rubber insulation cable for railway vehicle and cable
CN110607022B (en) * 2019-10-10 2022-06-14 凯布斯工业电气线缆(苏州)有限公司 Composite material for locomotive cable outer sheath, preparation method of composite material, cable outer sheath and locomotive cable
CN211604717U (en) * 2020-03-28 2020-09-29 远东电缆有限公司 Safe and environment-friendly composite cable with combustion performance of B1 level

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4036476A1 (en) * 1990-02-13 1991-08-14 Siemens Ag Flexible electrical cable for supplying lifting crane magnet - has intermediate packing between cable wires and enclosing rubber mantle
CN104327366A (en) * 2014-10-16 2015-02-04 马弗橡胶（镇江）有限公司 Weather-proof type halogen-free flame-retardation cable sheath material formula used for locomotive and preparation method thereof
CN109265813A (en) * 2018-09-14 2019-01-25 成都营门电缆有限责任公司 A kind of marine inflaming-retarding cable jacket material of salt spray proof and preparation method thereof
CN110690003A (en) * 2019-11-05 2020-01-14 远东电缆有限公司 66kV wind power high-voltage torsion cable and production process thereof
CN111834041A (en) * 2020-08-18 2020-10-27 江苏亨通电力电缆有限公司 Urban rail transit pulls B for power supply system135 kV-level ring network cable

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023040054A1 (en) * 2021-09-16 2023-03-23 江苏上上电缆集团有限公司 Method for manufacturing ethylene propylene-insulated low-smoke halogen-free torsion-resistant medium-pressure wind power cable, and cable
CN116120658A (en) * 2022-12-29 2023-05-16 江苏亨通电力电缆有限公司 Mould-resistant halogen-free rubber sheath material and cable bridge cable comprising same

Also Published As

Publication number Publication date
WO2022095093A1 (en) 2022-05-12

Similar Documents

Publication Publication Date Title
CN112435787A (en) Torsion-resistant cable for 66kV fan power transmission and preparation method and application thereof
CN100392769C (en) Longitudinal watertightness cable/wire
CN101430946B (en) Production method of 8.7/10kV and below mining monitor rubber jacketed flexible cable
CN113871064B (en) Manufacturing method of 105 ℃ torsion-resistant wind energy cable and cable
WO2020119308A1 (en) Method for fabricating hollow electric cable for charging new energy vehicle and electric cable
CN103065717A (en) 6kV-35kV rated-voltage ceramic silicon rubber insulation medium-voltage fire-resistant frequency converter cable and process
CN110718322B (en) Fan bridge cable
CN104835565A (en) Cable for new energy automobile charging device and preparation method thereof
CN102403067B (en) Ethylene propylene rubber insulating fire-resistant medium-voltage power cable for marine engineering and method for producing same
CN104143390B (en) A kind of manufacturing process of deep water sealing Plastic-sheathed Cable
CN202758656U (en) Ceramic silicon rubber insulation medium-voltage fire-resistant cable with rated voltage of 6kV-35kV
CN102360594B (en) Medium voltage torsion resistant cable for wind turbine
CN116120658A (en) Mould-resistant halogen-free rubber sheath material and cable bridge cable comprising same
CN102347107A (en) Hard EPR (ethylene propylene rubber) insulated power cable for ships and oceans and manufacturing method thereof
CN114023497B (en) DC charging pile cable
CN106997790A (en) A kind of tension flexible waterproof type cable and preparation method
CN201117335Y (en) 8.7/10kV and below rubber sheath flexible cable for mining monitoring
CN116705400B (en) High-voltage torsion-resistant flexible cable for rated voltage 132kV wind turbine generator and preparation method and application thereof
CN113903531B (en) Manufacturing method of ethylene-propylene insulating low-smoke halogen-free torsion-resistant medium-voltage wind energy cable and cable
CN221861318U (en) Longitudinal waterproof cable of underwater robot
CN110628138A (en) Medium-voltage anti-torsion power cable for wind generating set and insulating material thereof
CN109599213B (en) American standard non-partial discharge ethylene propylene insulation medium voltage cable
CN115685460B (en) Bundling butterfly-shaped optical cable and preparation method thereof
CN116403782A (en) Manufacturing method of down lead cable of fan blade embedded lightning receptor
CN214336393U (en) Rubber sleeve cable for electric tool

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20210302