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CN112103006A - Environment-friendly 500kV ultrahigh-voltage cable and manufacturing method thereof - Google Patents

Environment-friendly 500kV ultrahigh-voltage cable and manufacturing method thereof Download PDF

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Publication number
CN112103006A
CN112103006A CN201910528788.6A CN201910528788A CN112103006A CN 112103006 A CN112103006 A CN 112103006A CN 201910528788 A CN201910528788 A CN 201910528788A CN 112103006 A CN112103006 A CN 112103006A
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China
Prior art keywords
layer
friendly
conductor
environment
voltage cable
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CN201910528788.6A
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Chinese (zh)
Inventor
夏云海
赵囿林
侯虹剑
蔡红祥
张于玥
穆朝金
丛思玮
付长琦
张建民
谢书鸿
薛驰
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Zhongtian Technology Submarine Cable Co Ltd
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Zhongtian Technology Submarine Cable Co Ltd
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Priority to CN201910528788.6A priority Critical patent/CN112103006A/en
Publication of CN112103006A publication Critical patent/CN112103006A/en
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    • 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
    • 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
    • H01B13/0006—Apparatus or processes specially adapted for manufacturing conductors or cables for reducing the size of conductors or cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/02—Stranding-up
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/065—Insulating conductors with lacquers or enamels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/14—Insulating conductors or cables by extrusion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/14—Insulating conductors or cables by extrusion
    • H01B13/145—Pretreatment or after-treatment
    • 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
    • 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
    • H01B13/228—After-treatment
    • 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
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
    • 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
    • H01B7/02—Disposition of insulation
    • H01B7/0275—Disposition of insulation comprising one or more extruded layers of insulation
    • H01B7/0283—Disposition of insulation comprising one or more extruded layers of insulation comprising in addition one or more other layers of non-extruded insulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/20—Metal tubes, e.g. lead sheaths
    • H01B7/205—Metal tubes, e.g. lead sheaths composed of aluminium
    • 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
    • H01B7/2806—Protection against damage caused by corrosion
    • 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
    • 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
    • H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
    • H01B7/2825—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable using a water impermeable sheath
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
    • 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
    • H01B7/30—Insulated conductors or cables characterised by their form with arrangements for reducing conductor losses when carrying alternating current, e.g. due to skin effect
    • H01B7/303—Conductors comprising interwire insulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/006—Constructional features relating to the conductors
    • 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
    • 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
    • H01B9/027—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of semi-conducting layers

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulated Conductors (AREA)

Abstract

The invention provides a method for manufacturing an environment-friendly 500kV ultrahigh voltage cable, which comprises the steps of drawing, painting and stranding a copper wire into strand blocks, tightly pressing a plurality of strand blocks to form a split conductor, coating a semi-conductive belt outside the split conductor, extruding and shaping the split conductor, sequentially extruding a conductor shielding layer, an insulating layer and an insulating shielding layer outside the semi-conductive belt, carrying out chemical crosslinking after heating treatment, degassing treatment, wrapping a comprehensive buffer layer outside the insulating shielding layer, welding a corrugated aluminum sleeve outside the comprehensive buffer layer, and sequentially extruding an anticorrosive layer, a sheath and a conductive layer on the periphery of the corrugated aluminum sleeve. The invention also provides an environment-friendly 500kV ultrahigh-voltage cable which comprises a comprehensive buffer layer, wherein the comprehensive buffer layer comprises a semiconductive butyl tape, a semiconductive buffer water-blocking tape and a semiconductive copper wire braid which are sequentially arranged. The environment-friendly 500kV ultrahigh voltage cable and the manufacturing method thereof have the advantages of high roundness and reliable operation.

Description

Environment-friendly 500kV ultrahigh-voltage cable and manufacturing method thereof
Technical Field
The invention relates to the field of cable manufacturing, in particular to an environment-friendly 500kV ultrahigh voltage cable and a manufacturing method thereof.
Background
The rapid development of the society requires that the power load is larger and the voltage grade is higher and higher. In order to solve the contradiction between large-capacity power transmission and space fields, the application of the ultrahigh voltage cable is more and more extensive. The structural buffer layer of the existing ultrahigh-voltage cable adopts a semi-conductive buffer water-blocking tape, and after the cable runs along with a plurality of thermal cycles, a gap is formed between the insulation shield of the cable and the buffer water-blocking tape due to thermal expansion and cold contraction of the cable, so that a potential difference is generated between the insulation shield and the buffer water-blocking tape to influence the reliable running of the cable, and the longitudinal water-permeable effect of the cable is influenced. Due to the characteristics of large insulation thickness, large conductor specification and large cable core outer diameter of the crosslinked cable core, the cable core is not round due to uneven shrinkage of material characteristics during crosslinking, electric field concentration can be formed at the non-round position during cable operation, the cable is easy to break down after long-time operation, and the insulation breakdown performance of the electric field concentration under impact voltage can be reduced.
Disclosure of Invention
In view of the above, it is desirable to provide an environment-friendly 500kV ultra-high voltage cable with high roundness and reliable operation and a manufacturing method thereof.
The invention provides a method for manufacturing an environment-friendly 500kV ultrahigh voltage cable, which comprises the following steps:
step 1, drawing a copper wire to manufacture the copper wire, and painting a first insulating layer on the surface of the copper wire;
step 2, stranding copper wires into strand blocks, pressing a plurality of strand blocks on the surface of a conductor to form a split conductor, and coating a semi-conductive belt outside the split conductor;
step 3, extruding and shaping the split conductor, and sequentially extruding a conductor shielding layer, an insulating layer and an insulating shielding layer outside the semi-conductive belt;
step 4, carrying out chemical crosslinking on the conductor shielding layer, the insulating layer and the insulating shielding layer after heating treatment;
step 5, degassing the conductor shielding layer, the insulating layer and the insulating shielding layer;
step 6, wrapping a comprehensive buffer layer outside the insulation shielding layer, and welding a corrugated aluminum sleeve outside the comprehensive buffer layer;
and 7, sequentially extruding an anticorrosive layer, a sheath and a conductive layer on the periphery of the corrugated aluminum sleeve.
Furthermore, the comprehensive buffer layer comprises a semiconductive butyl tape, a semiconductive buffer water-blocking tape and a semiconductive copper wire braid, and the semiconductive butyl tape, the semiconductive buffer water-blocking tape and the semiconductive copper wire braid are sequentially wrapped on the surface of the insulating shielding layer through a wrapping machine.
Furthermore, the cross section of the strand block is corrugated.
Further, the split conductor comprises a first conductor and a plurality of strand blocks, and the strand blocks are tightly pressed on the surface of the first conductor in a surrounding mode.
Further, the split conductor is extruded and shaped through a shaping device, and the shaping device is a shaping wheel.
Further, the conductor shielding layer, the insulating layer and the insulating shielding layer are heated by heating equipment, and the heating equipment is pulse heating equipment.
Further, anticorrosive coating, sheath and conducting layer are extruded through the sheath machine, the sheath machine includes first extruding machine and second extruding machine, first extruding machine is in wrinkle aluminium cover outer coating hot melt adhesive forms the anticorrosive coating, the second extruding machine is in anticorrosive coating outer extrusion sheath and conducting layer.
The invention provides an environment-friendly 500kV ultrahigh-voltage cable manufactured by applying the manufacturing method of the environment-friendly 500kV ultrahigh-voltage cable, wherein the environment-friendly 500kV ultrahigh-voltage cable comprises a split conductor, a semi-conductive belt, a conductor shielding layer, an insulating shielding layer, a comprehensive buffer layer, a corrugated aluminum sleeve, an anti-corrosion layer, a sheath and a conductive layer which are sequentially arranged from inside to outside, the comprehensive buffer layer comprises a semi-conductive butyl tape, a semi-conductive buffering water-blocking tape and a semi-conductive copper wire braid, and the semi-conductive butyl tape, the semi-conductive buffering water-blocking tape and the semi-conductive copper wire braid are sequentially coated.
Furthermore, the strand block is formed by twisting an enameled wire, and the enameled wire comprises a copper wire and a first insulating layer coated on the surface of the copper wire.
Further, the anticorrosive coating is made of hot melt adhesive.
In the above-mentioned environment-friendly 500kV ultra-high voltage cable and the manufacturing method thereof, the shaping device extrudes the deformed region of the split conductor to improve the roundness of the environment-friendly 500kV ultra-high voltage cable. The semi-conductive copper wire braid is wrapped on the outer layer of the semi-conductive buffer water-blocking tape, has good conductivity and is in good electrical contact with the corrugated aluminum sleeve, so that the semi-conductive copper wire braid and the corrugated aluminum sleeve are kept at the same potential, and the running reliability of the environment-friendly 500kV ultrahigh voltage cable is further improved.
Drawings
Fig. 1 is a schematic flow chart of a method for manufacturing an environment-friendly 500kV ultra-high voltage cable in an embodiment of the invention.
Fig. 2 is a cross-sectional structure view of an environment-friendly 500kV ultra-high voltage cable in an embodiment of the invention.
Description of the main elements
Figure BDA0002099053600000031
Figure BDA0002099053600000041
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
So that the manner in which the above recited objects, features and advantages of embodiments of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth to provide a thorough understanding of embodiments of the invention, some, but not all embodiments of the invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the embodiments of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the present invention belong. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of embodiments of the invention.
Referring to fig. 1 and fig. 2, the method for manufacturing the environment-friendly 500kV ultra-high voltage cable 100 specifically includes the following steps:
s1, drawing and painting the copper wire;
specifically, a copper wire is drawn through a copper heavy drawing machine, and the drawn copper wire is subjected to painting treatment to form an enameled wire. Specifically, the copper wire is annealed and softened, then is coated with a paint body for multiple times, and then is dried, so that a first insulating layer is formed on the surface of the copper wire. Compared with a common copper wire, the first insulating layer effectively inhibits the skin effect, and improves the transmission capacity of the environment-friendly 500kV ultrahigh-voltage cable 100. In one embodiment, the lacquer body comprises a polyester imide, and the first insulating layer is a polyester imide insulating layer.
S2, twisting the strand block 11;
specifically, the enameled wires are stranded into a plurality of strand blocks 11 through a frame stranding machine, and the cross section of each strand block 11 is corrugated. The production method of the strand block 11 only needs to change a pinch roller mold in the existing frame twisting equipment, and the existing production line can be quickly adjusted to produce the corrugated strand block 11.
S3, cabling the conductors;
specifically, a plurality of strand blocks 11 are wound around and pressed against the surface of the first conductor 12 by a disc stranding machine to form a divided conductor 10 having a circular cross section, and a semiconductive tape 21 is coated outside the divided conductor 10. The strand block 11 and the first conductor 12 are attached to each other, and the first conductor 12 serves as a support member for the strand block 11, so that the structural stability of the segmented conductor 10 is improved. The strand 11 surrounds the surface of the first conductor 12 to improve the roundness of the segment conductor 10. In one embodiment, the divided conductor 10 includes 7 strand blocks 11, and adjacent strand blocks 11 are separated by a corrugated insulating paper 13 to increase the surface area of the divided conductor 10, thereby effectively reducing the increase in ac resistance of the divided conductor 10 due to the skin effect. The difference between the maximum value and the minimum value of the measured diameter of the cross section of the split conductor 10 is f, wherein f is within 0.5mm, the first conductor 12 is a copper wire with a circular cross section, and the area of the cross section is 50mm2The semiconductive tape 21 is a semiconductive teflon tape.
S4, extruding and shaping the segment conductor 10;
specifically, when the split conductor 10 is pulled by a guide wheel and a pulling device on a production line, the cross section of the split conductor 10 is large, and a partial area of the split conductor 10 is deformed under the influence of an external force, so that the difference f between the maximum value and the minimum value of the measured diameter on the cross section of the split conductor 10 exceeds 0.5 mm. The split conductor 10 is extruded and shaped by shaping equipment before entering a cross-linking machine set. Specifically, the crosslinking device comprises a machine head and a crosslinking area. The divided conductors 10 are extruded and shaped by shaping equipment before entering a machine head so as to restore the roundness of the deformed area of the divided conductors 10, and further, the difference between the maximum value and the minimum value of the measured diameter on the cross section of the divided conductors 10 is kept within 0.5 mm. In an embodiment, the shaping device is a shaping wheel.
S5, extruding the conductor shield layer 22, the insulation layer 23 and the insulation shield layer 24;
specifically, the outer surface of the semiconductive belt is sequentially extruded with a conductor shield layer 22, an insulating layer 23, and an insulating shield layer 24 by the head to insulate the outer periphery of the semiconductive belt 21. In one embodiment, the machine head is a three-layer co-extrusion machine head, and the machine head simultaneously extrudes the conductor shielding layer 22, the insulating layer 23 and the insulating shielding layer 24, so that the interface of the conductor shielding layer 22, the insulating layer 23 and the insulating shielding layer 24 is smooth, and the electrical insulation performance of the environment-friendly 500kV ultra-high voltage cable 100 is improved.
The crosslinking equipment is used for changing materials through the glove box, nitrogen is introduced into the glove box and used for circularly filtering impurities such as floating dust and particles in the glove box, and therefore impurities are prevented from being mixed in the material changing process. The whole process of the material changing process is sealed, an operator wears the anti-static purifying clothes to avoid the pollution of human hair and sweat on the insulating material, and in one embodiment, the cleanliness class in the glove box is as follows: 0 impurity of more than or equal to 5 microns, and the cleanliness grade in the purification material room: the number of impurities of more than or equal to 5 microns is less than 200.
Handing over equipment unloading and adopting gravity blanking mode, comparing with traditional material mode of inhaling, having avoided the friction of insulating material grain and pipe wall to avoid additive in the insulating material grain is because frictional heating is appeared, and then improves environment-friendly 500kV ultra high voltage cable 100's electrical insulation's reliability. In one embodiment, the cross-linking equipment is a vertical U-shaped three-layer co-extrusion cross-linking production unit.
S6, performing chemical crosslinking on the conductor shield layer 22, the insulating layer 23, and the insulating shield layer 24 after heat treatment;
the conductor shielding layer 22, the insulating layer 23 and the insulating shielding layer 24 are heated through heating equipment, the heating equipment is installed between the machine head and the cross-linking area, so that a high-temperature multi-area pulse type heating special cross-linking area is added between the machine head and the cross-linking area, the conductor shielding layer 22, the insulating layer 23 and the insulating shielding layer 24 reach a qualified cross-linking degree rapidly before entering the cross-linking area, the geometric deformation of the cable in the cross-linking and cooling processes is controlled, the cable is in a controlled state in the cross-linking and cooling processes, the roundness of the environment-friendly 500kV ultrahigh voltage cable 100 reaches more than 99.5%, and the quality of the environment-friendly 500kV ultrahigh voltage cable 100 is improved. In an embodiment, the heating device is a pulse heating device.
S7, degassing;
specifically, the divided conductor 10 coated with the semiconductive tape 21, the conductive shielding layer 22, the insulating layer 23, and the insulating shielding layer 24 is placed in a drying room to be degassed, so as to accelerate elimination of cross-linking by-products in the conductive shielding layer 22, the insulating layer 23, and the insulating shielding layer 24, and remove mechanical stress generated due to temperature change.
S8, wrapping the comprehensive buffer layer 25;
specifically, the comprehensive buffer layer 25 is wrapped on the outer layer of the insulation shielding layer 24 through a wrapping machine. The comprehensive buffer layer 25 comprises a semiconductive butyl tape 251, a semiconductive buffer water-blocking tape 252 and a semiconductive copper braid 253. The semi-conductive butyl tape 251, the semi-conductive buffer water-blocking tape 252 and the semi-conductive copper braid 253 are sequentially wrapped on the outer layer of the insulation shielding layer 24. The semi-conductive butyl tape 251 is used for avoiding a gap between the insulation shielding layer 24 and the semi-conductive buffer water-blocking tape 252 due to thermal circulation when the high-voltage cable runs, so as to avoid partial discharge. The semi-conductive copper braid 253 has good conductivity, is in good electrical contact with the corrugated aluminum sleeve 26, equalizes the electric field intensity, and keeps the electric potential of the two, so that the reliability of the environment-friendly 500kV ultrahigh-voltage cable 100 is improved.
S9, welding the corrugated aluminum sleeve 26;
specifically, the corrugated aluminum sleeve 26 is welded to the outer layer of the semiconductive copper braid 253 by a welding device. The welding leakage point of the welding line is subjected to online welding seam flaw detection by using the eddy current flaw detector in the welding process, and when the eddy current flaw detector detects the welding leakage point, an alarm is given to remind an operator to perform repair welding, so that the sealing performance of the aluminum sleeve is improved, moisture is effectively prevented from entering the cable, the generation of water trees in the insulation part is avoided, and the quality of the cable is improved. In one embodiment, the welding device is an argon arc welding machine.
S10, extruding the corrosion-resistant layer 27, the sheath 28 and the conductive layer 29.
Specifically, the outer layer of the corrugated aluminum jacket 26 is extruded with an anticorrosive layer 27, a jacket 28 and a semiconductive layer 29 by a sheathing machine. The sheath machine includes first extruding machine and second extruding machine, and in an embodiment, the aperture of first extruding machine is 60mm, first extruding machine be used for the wrinkle aluminium cover 26 outer coating hot melt adhesive to keep thickness evenly stable when crowded package hot melt adhesive, guarantee wrinkle aluminium cover 26 and sheath 28 bond inseparabler, avoid the phenomenon of sheath 28 the bulge appears. The aperture of the second extruder is 200mm, the second extruder is provided with a single-thread screw, the single-thread screw is a low-compression-ratio low-shear single-thread screw, and the compression ratio is 1: 1.15. The second extruder is used to coat the sheath 28 and the semiconductive layer 29 outside the corrosion protection layer.
When the sheathing machine is used, firstly, the first extruding machine coats hot melt glue on the corrugated aluminum sleeve 26 to form an anticorrosive layer 27. The hot melt adhesive is coated on the surface of the corrugated aluminum sleeve 26, can be used as an anticorrosive coating and can improve the adhesion degree with the sheath, so that the corrugated aluminum sleeve 26 and the sheath 28 cannot deform or displace when the environment-friendly 500kV ultrahigh-voltage cable 100 is bent. In the production process, compared with the traditional asphalt anticorrosive coating, the hot melt adhesive used as the anticorrosive coating has less pollution and is more environment-friendly.
The second plastic extruding machine extrudes the sheath 28 and the semi-conducting layer 29 outside the anti-corrosion layer 27, and the sheath 28 and the conducting layer 29 are extruded simultaneously, so that the extruding thickness of the conducting layer 29 is uniform, the bonding performance with the sheath 28 is improved, and the direct-current voltage-resisting reliability of the sheath 28 is further improved.
Referring to fig. 2, the environment-friendly 500kV ultra-high voltage cable 100 is manufactured by the manufacturing method of the environment-friendly 500kV ultra-high voltage cable. The environment-friendly 500kV ultra-high voltage cable 100 comprises a split conductor 10, a semi-conducting strip 21, a conductor shielding layer 22, an insulating layer 23, an insulating shielding layer 24, a comprehensive buffer layer 25, a corrugated aluminum sleeve 26, an anti-corrosion layer 27, a sheath 28 and a conducting layer 29 which are sequentially arranged from inside to outside.
The segment conductor 10 includes a first conductor 12 and a plurality of strands 11. The strand block 11 and the first conductor are attached to each other, and the first conductor 12 serves as a support member for the strand block 11, so that the structural stability and the roundness of the split conductor 10 are improved. The adjacent strands 11 are isolated from each other by a corrugated insulating paper 13 to increase the surface area of the divided conductor 10, thereby reducing the ac resistance of the divided conductor 10. In one embodiment, the split conductor 10 includes 7 strand blocks 11, the strand blocks 11 are corrugated, and the plurality of strand blocks 11 are pressed against the surface of the first conductor 12 to form the split conductor 10 with a circular cross section. Since the sectional area of the segment conductor 10 is composed of the sectional areas of the plurality of strand blocks 11, the "skin effect" and the "proximity effect" of each strand block 11 are reduced, so as to effectively reduce the increase of the alternating current resistance of the segment conductor 10 caused by the skin effect, further effectively reduce the loss heat of the segment conductor 10, and increase the current-carrying capacity of the conductor.
The strand block 11 is formed by twisting an enameled wire, and specifically, the enameled wire includes a copper wire and a first insulating layer coated on the surface of the copper wire. Compared with a common copper wire, the first insulating layer effectively inhibits the skin effect, and improves the transmission capacity of the environment-friendly 500kV ultrahigh-voltage cable. In one embodiment, the first insulating layer is a polyester imide insulating layer.
The comprehensive buffer layer 25 comprises a semiconductive butyl tape 251, a semiconductive buffer water-blocking tape 252 and a semiconductive copper braid 253. The semi-conductive butyl tape 251, the semi-conductive buffer water-blocking tape 252 and the semi-conductive copper braid 253 are sequentially wrapped on the outer layer of the insulation shielding layer 24. The semi-conductive butyl tape 251 is used for avoiding a gap between the insulation shielding layer 24 and the semi-conductive buffer water-blocking tape 252 due to thermal circulation during the operation of the high-voltage cable. The semi-conductive copper braid 253 has good conductivity, is in good electrical contact with the corrugated aluminum sleeve 26, equalizes the electric field intensity, and keeps the electric potential of the two, so that the reliability of the environment-friendly 500kV ultrahigh voltage cable 100 is improved.
The corrugated aluminum sleeve 26 is coated with hot melt adhesive to form an anticorrosive layer 27. The hot melt adhesive is coated on the surface of the corrugated aluminum sleeve 26, can be used as an anticorrosive coating and can improve the adhesion degree with the sheath, so that the corrugated aluminum sleeve 26 and the sheath 28 cannot deform or displace when the environment-friendly 500kV ultrahigh-voltage cable 100 is bent. Compared with the existing asphalt anticorrosive coating, the hot melt adhesive can not generate irritating gas in the production process so as to protect the environment.
The sheath 28 is made of an environment-friendly flame retardant material, and specifically, the environment-friendly flame retardant material is processed by using polyolefin as a base material and materials such as a halogen-free flame retardant, a smoke suppressor, a lubricant and the like. The environment-friendly flame-retardant material has halogen-free performance, the PH is more than or equal to 4.3, the conductivity is less than or equal to 10 mu S/mm, the smoke is low, and the minimum light transmittance is more than or equal to 60%. The environment-friendly flame-retardant material has excellent flame retardance, meets the requirement of light transmittance, emits no halogen acid gas during combustion, has extremely low release amount of toxic and corrosive gases, generates low smoke concentration, and remarkably improves the cracking resistance, thereby improving the cracking resistance of the environment-friendly 500kV ultrahigh-voltage cable 100.
In the above-mentioned environment-friendly 500kV ultra-high voltage cable 100 and the manufacturing method, the shaping device extrudes and shapes the split conductor 10, and the heating device heats the conductor shielding layer 22, the insulating layer 23 and the insulating shielding layer 24, so that the conductor shielding layer 22, the insulating layer 23 and the insulating shielding layer 24 reach a qualified crosslinking degree quickly before entering a crosslinking area, and further the insulating material shrinks uniformly on the outer surface of the split conductor 10, so as to improve the roundness of the environment-friendly 500kV ultra-high voltage cable 100. The semi-conductive copper braid 253 is wrapped on the outer layer of the semi-conductive buffer water-blocking tape 252, the semi-conductive copper braid 253 has good conductivity, is in good electrical contact with the corrugated aluminum sleeve, homogenizes the electric field intensity, and enables the semi-conductive copper braid 253 and the corrugated aluminum sleeve to keep equal potential, so that the reliability of the environment-friendly 500kV ultrahigh voltage cable 100 is improved.
Although the embodiments of the present invention have been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the embodiments of the present invention.

Claims (10)

1. The manufacturing method of the environment-friendly 500kV ultrahigh voltage cable is characterized by comprising the following steps:
step 1, drawing a copper wire to manufacture the copper wire, and painting a first insulating layer on the surface of the copper wire;
step 2, stranding copper wires into strand blocks, pressing a plurality of strand blocks on the surface of a conductor to form a split conductor, and coating a semi-conductive belt outside the split conductor;
step 3, extruding and shaping the split conductor, and sequentially extruding a conductor shielding layer, an insulating layer and an insulating shielding layer outside the semi-conductive belt;
step 4, carrying out chemical crosslinking on the conductor shielding layer, the insulating layer and the insulating shielding layer after heating treatment;
step 5, degassing the conductor shielding layer, the insulating layer and the insulating shielding layer;
step 6, wrapping a comprehensive buffer layer outside the insulation shielding layer, and welding a corrugated aluminum sleeve outside the comprehensive buffer layer;
and 7, sequentially extruding an anticorrosive layer, a sheath and a conductive layer on the periphery of the corrugated aluminum sleeve.
2. The manufacturing method of the environment-friendly 500kV ultrahigh-voltage cable according to claim 1, wherein the comprehensive buffer layer comprises a semiconductive butyl tape, a semiconductive buffering water-blocking tape and a semiconductive copper wire braid, and the semiconductive butyl tape, the semiconductive buffering water-blocking tape and the semiconductive copper wire braid are sequentially wrapped on the surface of the insulating shielding layer through a wrapping machine.
3. The method for manufacturing the environment-friendly 500kV extra-high voltage cable according to claim 1, wherein the strand block is corrugated in cross section.
4. The method as claimed in claim 3, wherein the split conductor comprises a first conductor and a plurality of strand blocks, and the strand blocks are tightly pressed around the surface of the first conductor.
5. The method for manufacturing an environment-friendly 500kV extra-high voltage cable according to claim 1, wherein the split conductor is extruded and shaped by a shaping device, and the shaping device is a shaping wheel.
6. The method for manufacturing the environment-friendly 500kV extra-high voltage cable according to claim 1, wherein the conductor shielding layer, the insulating layer and the insulating shielding layer are heated by a heating device, and the heating device is a pulse heating device.
7. The method for manufacturing the environment-friendly 500kV extra-high voltage cable according to claim 1, wherein the anti-corrosion layer, the sheath and the conductive layer are extruded by a sheath machine, the sheath machine comprises a first extruding machine and a second extruding machine, the first extruding machine coats the corrugated aluminum sheath with hot melt adhesive to form the anti-corrosion layer, and the second extruding machine extrudes the sheath and the conductive layer outside the anti-corrosion layer.
8. An environment-friendly 500kV extra-high voltage cable manufactured by the method for manufacturing the environment-friendly 500kV extra-high voltage cable according to any one of claims 1 to 7, wherein the method comprises the following steps: the environment-friendly 500kV ultrahigh-voltage cable comprises a split conductor, a semi-conductive belt, a conductor shielding layer, an insulating shielding layer, a comprehensive buffer layer, a corrugated aluminum sleeve, an anticorrosive layer, a sheath and a conductive layer which are sequentially arranged from inside to outside, wherein the comprehensive buffer layer comprises a semi-conductive butyl tape, a semi-conductive buffering water-blocking tape and a semi-conductive copper wire braid, and the semi-conductive butyl tape, the semi-conductive buffering water-blocking tape and the semi-conductive copper wire braid are sequentially coated on the outer layer of the insulating shielding layer.
9. The environment-friendly 500kV extra-high voltage cable according to claim 8, wherein the strand block is formed by twisting enameled wires, and each enameled wire comprises a copper wire and a first insulating layer coated on the surface of the copper wire.
10. The environment-friendly 500kV extra-high voltage cable according to claim 8, wherein the anti-corrosion layer is made of a hot melt adhesive.
CN201910528788.6A 2019-06-18 2019-06-18 Environment-friendly 500kV ultrahigh-voltage cable and manufacturing method thereof Pending CN112103006A (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117542565A (en) * 2023-09-27 2024-02-09 江苏江扬特种电缆有限公司 Umbilical cable for ocean drilling platform and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117542565A (en) * 2023-09-27 2024-02-09 江苏江扬特种电缆有限公司 Umbilical cable for ocean drilling platform and preparation method thereof
CN117542565B (en) * 2023-09-27 2024-04-09 江苏江扬特种电缆有限公司 Umbilical cable for ocean drilling platform and preparation method thereof

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