WO2021073272A1 - Câble à courant continu haute tension à faible section transversale résistant aux rayonnements pour centrale nucléaire et son procédé de fabrication - Google Patents

Câble à courant continu haute tension à faible section transversale résistant aux rayonnements pour centrale nucléaire et son procédé de fabrication Download PDF

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WO2021073272A1
WO2021073272A1 PCT/CN2020/111930 CN2020111930W WO2021073272A1 WO 2021073272 A1 WO2021073272 A1 WO 2021073272A1 CN 2020111930 W CN2020111930 W CN 2020111930W WO 2021073272 A1 WO2021073272 A1 WO 2021073272A1
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zone
semi
cable
conductive shielding
metal
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PCT/CN2020/111930
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English (en)
Chinese (zh)
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金华东
狄洪杰
梁福才
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江苏上上电缆集团有限公司
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • 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
    • H01B13/06—Insulating conductors or cables
    • H01B13/14—Insulating conductors or cables by extrusion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • 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
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/182—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring comprising synthetic filaments
    • H01B7/1825—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring comprising synthetic filaments forming part of a high tensile strength core
    • 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
    • H01B7/22—Metal wires or tapes, e.g. made of steel
    • H01B7/221—Longitudinally placed metal wires or tapes
    • H01B7/223—Longitudinally placed metal wires or tapes forming part of a high tensile strength core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables

Definitions

  • the technical solution belongs to the technical field of cables for nuclear power plants, and specifically relates to a radiation-resistant small-section high-voltage direct current cable for nuclear power plants and a manufacturing method thereof.
  • the working conditions in the containment of third- and fourth-generation nuclear power plants are more severe than those of previous second-generation power plants, and the working conditions after a nuclear safety accident are even worse.
  • high-dose irradiation, high temperature, high pressure, high acid and high alkali solution, etc. in this environment, the cable needs to perform its specific function.
  • the cable due to the unpredictable time of the accident, the cable also needs to have the ability to simulate thermal aging and radiation aging. That is, no matter in normal operating conditions or accident conditions, the cables can normally transmit current and signals during the 60-year life of the nuclear power plant.
  • the power input is in the form of high-voltage direct current.
  • Laying and using in the congested and narrow space of nuclear power plant not only requires the cable to have low-smoke, halogen-free and flame-retardant properties, but also requires the cable to have aging resistance, radiation resistance, high temperature resistance, high pressure resistance, good flexibility, small outer diameter, high voltage output, etc.
  • a method for manufacturing a radiation-resistant small cross-section high-voltage DC cable for nuclear power plants The nominal cross-section of the cable conductor ranges from 4 to 10 mm 2.
  • the structure of the cable is: the structure of the cable is: from the inside to the outside, the conductor and the inner half are in order.
  • the manufacturing steps of the cable include:
  • Bundle a high-strength aramid filament and multiple metal monofilaments made of tin-plated copper to form a conductor;
  • the metal monofilament is divided into multiple layers from the inside to the outside; two adjacent metal monofilaments in each metal monofilament are closely attached to each other; in two adjacent metal monofilaments, the inner and outer metal monofilaments are closely attached ;
  • the stranding direction of the metal monofilament is left, and the stranding pitch of the metal monofilament is not more than 16 times the outer diameter after the stranding;
  • the semi-conductive shielding material and insulating material are wrapped around the conductor by double-layer extrusion and cooled to form an inner semi-conductive shielding layer and insulating layer;
  • the semi-conductive shielding material is a semi-conductive insulating shielding material, and the insulating material is a resistive material. Fire ethylene propylene rubber insulation material;
  • the temperature zone of the extruder is: zone one 68 ⁇ 73°C, zone two 76 ⁇ 81°C, zone three 88 ⁇ 94°C, zone four 96 ⁇ 100 °C;
  • the temperature zone of the extruder is: 60 ⁇ 70°C in the first zone, 65 ⁇ 75°C in the second zone, 70 ⁇ 80°C in the third zone, 75 ⁇ 85°C in the fourth zone;
  • the first zone of the rubber extruder is the feeding section, the second and third zones are the plasticizing section, and the fourth zone is the homogenizing section;
  • the temperature zone of the extruder's nose is: 80 ⁇ 90°C in the first zone, 75 ⁇ 85°C in the second zone; among them, the first zone is the nose section and the second zone is the neck section;
  • the saturated steam pressure is maintained at 1.5 ⁇ 1.7MPa, and the water level is controlled between 20% ⁇ 30%;
  • the semi-conductive shielding tape is wrapped around the insulating layer to form an outer semi-conductive shielding layer by overlapping wrapping, the wrapping overlap rate is not less than 15%, and the thickness of the semi-conductive shielding tape is 0.12mm ⁇ 0.15mm;
  • the polyimide film is wrapped around the metal mesh by overlapping wrapping, the wrapping overlap rate is not less than 25%, and the thickness of the polyimide film is 0.025mm ⁇ 0.05mm;
  • Adopt continuous vulcanization method to uniformly and tightly squeeze the low-smoke halogen-free flame-retardant sheath material outside the cable core and cool it;
  • the sheath material is a thermosetting, low-smoke, halogen-free, flame-retardant EVA mixture, and its oxygen index is not less than 30%; a sheath die sleeve is equipped on the extruder machine-reading head; the diameter of the sheath die sleeve is larger than the outer diameter of the cable core; When the material reaches the direction of discharging, the temperature distribution of each zone of the extruder is: zone 1 50 ⁇ 60°C, zone 2 55 ⁇ 65°C, zone 3 60 ⁇ 70°C, zone 4 65 ⁇ 75°C, among which, zone 1 is In the feeding section, the second and third zones are the plasticizing section, and the fourth zone is the homogenizing section;
  • the temperature zone of the extruder head is: 65 ⁇ 80°C in the first zone, 70 ⁇ 90°C in the second zone, 70 ⁇ 80°C in the third zone; among them, the first zone is the head section and the second zone. It is the neck section of the machine, and the three zones are the die mouth section;
  • the saturated steam pressure is maintained at 1.4 ⁇ 1.6MPa, and the water level is controlled at 20% ⁇ 25%.
  • the temperature zone of the extruder's body is: zone one 70°C, zone two 78°C, zone three 91°C, zone four 98°C;
  • the temperature zone of the extruder's body is: 65°C in the first zone, 70°C in the second zone, 75°C in the third zone, and 80°C in the fourth zone;
  • the temperature zone of the extruder's head is: 85°C in the first zone, and two Zone 80°C;
  • the saturated steam pressure is maintained at 1.6MPa during insulation extrusion;
  • the temperature zone of the rubber extruder is: 55°C in the first zone, 60°C in the second zone, 65°C in the third zone, and 70°C in the fourth zone; °C, 80°C in the second zone and 75°C in the third zone; the saturated steam pressure is maintained at 1.5MP during sheath extrusion.
  • the semi-conductive shielding tape is prefabricated from a semi-conductive shielding material, and the nominal thickness of the semi-conductive shielding tape is 0.12 mm.
  • the tin-plated metal wire is braided outside the outer semiconductive shielding layer to form a metal mesh; the braiding coverage is not less than 80%; the nominal diameter of the tin-plated metal wire is 0.12 mm to 0.20 mm.
  • the best braided wire for tinned metal wire is 0.15mm.
  • the copper metal tape is wrapped over the outer semiconductive shielding layer, and the wrapping overlap rate is not less than 15%; the nominal thickness of the copper metal tape is 0.1mm-0.12mm.
  • the thickness of the polyimide film is 0.025 mm.
  • the core diameter of the sheath mold sleeve the outer diameter of the cable core + 0.5 mm.
  • a radiation-resistant high-voltage DC cable with a small cross-section for nuclear power plants which is made by the above method;
  • the nominal cross-section range of cable conductor is 4 ⁇ 10mm 2 .
  • the structure of the cable is: from the inside to the outside, it is a conductor, an inner semi-conductive shielding layer, an insulating layer, an outer semi-conductive shielding layer, a metal shielding layer, a polyimide film layer and a sheath;
  • the structure of the conductor is as follows: a high-strength aramid filament (breaking strength not less than 1269N) and a plurality of tinned copper monofilament bundles constitute the conductor; the aramid filament is at the axis of the conductor; the monofilament is self-contained It is divided into multiple layers from the inside to the outside; the bundle direction of the monofilament is left; the bundle pitch of the monofilament is not more than 16 times the bundled outer diameter;
  • the inner semi-conductive shielding layer and the insulating layer are composed of a double-layer co-extruded semi-conductive shielding material and insulating material;
  • the outer semi-conductive shielding layer is composed of overlapping wrapped semi-conductive shielding tape, and the wrapping overlap rate is not less than 15%; the thickness of the semi-conductive shielding tape is 0.12mm ⁇ 0.15mm;
  • the polyimide film layer is composed of overlapping and wrapping polyimide films; the thickness of the polyimide film is 0.025mm ⁇ 0.05mm, and the wrapping overlap rate is not less than 25%.
  • a radiation-resistant, small-section, high-voltage DC cable for nuclear power plants Its structure is as follows: a high-strength aramid wire and multiple tin-plated copper metal monofilaments are bundled to form a conductor; the conductor is extruded with semi-conductive shielding material and insulation Material; the insulating layer is wrapped with a semi-conductive shielding tape to form the wire core; the wire core is wrapped with a metal shielding layer (wire braided mesh or wrapped metal tape) and polyimide film to form a cable core; the cable core is wrapped with low-smoke and halogen-free Flame-retardant materials constitute the cable sheath.
  • Polyimide film has the characteristics of high insulation performance, high temperature resistance, radiation resistance, and aging resistance, which improves the service life of the cable.
  • the polyimide film has a thickness of 0.025 mm, and the wrapping overlap rate is not less than 25%.
  • Semi-conductive shielding material and insulating material are tightly packed on the surface of the conductor.
  • the semi-conductive shielding material is XPB-30A.
  • the material of the insulation layer is ethylene-propylene rubber insulation, with a life span of 60 years, nuclear radiation resistance, low smoke, halogen-free, non-toxic, flame retardant and thermosetting properties.
  • the insulating layer is wrapped with a layer of semi-conductive shielding tape by overlapping wrapping.
  • the requirements of the semi-conductive shielding material are: certain conductivity, aging resistance, low smoke, halogen-free, flame retardant and other characteristics.
  • the outer semi-conductive shielding layer adopts a metal shielding layer (tinned metal wire is woven into a metal mesh, and the material of the metal woven mesh is required to be: high conductivity, corrosion resistance, high mechanical strength and tensile strength).
  • a polyimide film is used as an auxiliary insulating layer to wrap the polyimide film outside the woven wire mesh by overlapping wrapping.
  • the polyimide film material is: high temperature resistance above 600°C, long-term use temperature range -200 ⁇ 300°C, high insulation performance.
  • the main function of this layer is to assist the outer sheath layer to resist high-dose gamma and beta radiation together, and to retain a certain insulation resistance and ensure the normal transmission of current under high temperature and high pressure accident conditions.
  • the sheath is uniformly and tightly squeezed out of the cable core; the sheath material of the sheath is: nuclear radiation resistance, low smoke, halogen-free, non-toxic, oil-resistant, flame-retardant and thermosetting.
  • the sheath can further block the transmission of harsh environments such as high temperature, high pressure, high dose gamma and beta rays to the insulation.
  • the cable can be used on some inspection equipment of third and fourth generation nuclear power plants. It is suitable for EPR, AP1000, CAP1600, Hualong No. 1 nuclear power plant containment, outside the containment, and conventional islands. Use of specific inspection equipment in the area.
  • the present invention proposes a manufacturing method dedicated to the cable.
  • a method for manufacturing the above-mentioned cable for a nuclear power plant the steps include:
  • the three-layer structure of the inner and outer semi-conductive shielding layer and insulating layer of the cable generally adopts single-layer extrusion or three-layer co-extrusion.
  • this cable adopts double-layer co-extrusion + wrapping technology
  • the semi-conductive shielding layer can homogenize the electric field strength
  • the insulating layer plays an effective electrical isolation role to ensure the good running performance of the cable.
  • the insulating layer can meet the following properties:
  • the semi-conductive shielding tape is wrapped around the insulation by overlapping wrapping, and the wrapping overlap rate is not less than 15%.
  • the thickness of the semi-conductive shielding material is 0.12mm ⁇ 0.15mm. This layer of semi-conductive shielding can also homogenize the electric field strength and ensure the distribution of the electric field strength of the cable.
  • the high-voltage resistance and partial discharge performance of the cable are greatly improved compared with the original performance after the semi-conductive shielding material is overlapped and wrapped around the insulation.
  • the partial discharge of the cable has dropped significantly, from 50pC to 20pC.
  • the ability of the cable to pass the DC withstand voltage is improved, and the cable can withstand the 60kV DC withstand voltage test for 15 minutes without breakdown after adding overlapping wrapping semi-conductive shielding materials.
  • the mechanical properties of the cable tensile strength ⁇ 9.0MPa, elongation at break ⁇ 200%; flame-retardant performance: meet the requirements of GB/T18380.12 for a single cable to be flame-retardant.
  • the cable prepared by this method can meet the design requirements, and at the same time, the pass rate can reach more than 99%.
  • Figure 1 is a schematic diagram of a radial cross-section of the cable of this embodiment
  • a radiation-resistant small cross-section high-voltage DC cable for nuclear power plants a high-strength aramid wire and multiple tin-plated copper metal monofilaments are bundled to form a conductor; the conductor is wrapped with semi-conductive shielding materials and insulating materials Form the core; the insulating surface wraps the semi-conductive shielding material to form the outer semi-conductive shielding layer; the outer semi-conductive shielding layer uses high-speed braiding equipment to weave the metal wire into a metal mesh to wrap the surface of the core; the polyimide is wrapped by wrapping The film is wrapped on the surface of the metal mesh to form the cable core; the cable core is wrapped with a low-smoke, halogen-free flame-retardant sheath material;
  • the lay length of the tin-plated copper metal monofilament bundle is not more than 16 times the outer diameter of the conductor after the bundle, and a high-strength aramid wire improves the tensile strength of the conductor.
  • the insulating layer and the inner and outer semi-conductive shielding layers can ensure the ability of the cable to withstand high voltage shocks.
  • the insulated wire core is wrapped with metal wire woven mesh and polyimide film, which can lead the cable to a larger short-circuit current protection system in the event of a fault.
  • the polyimide film has high insulation performance, high temperature resistance, radiation resistance, The characteristics of aging resistance improve the service life of the cable.
  • the sheath material requirements for cables are: nuclear radiation resistance, low smoke, halogen-free, non-toxic, oil-resistant, flame-retardant and thermosetting. The sheath is evenly and tightly squeezed out of the cable core.
  • the insulating material uses ethylene-propylene rubber insulating material
  • the inner and outer semi-conductive shielding layers are used as auxiliary insulating layers
  • the sheath material is a thermosetting EVA mixture.
  • the manufacturing steps of the cable include:
  • Bundle a high-strength aramid filament and multiple metal monofilaments made of tin-plated copper to form a conductor;
  • the metal monofilament is divided into multiple layers from the inside to the outside; two adjacent metal monofilaments in each metal monofilament are closely attached to each other; in two adjacent metal monofilaments, the inner and outer metal monofilaments are closely attached ;
  • the stranding direction of the metal monofilament is left, and the stranding pitch of the metal monofilament is not more than 16 times the outer diameter after the stranding;
  • the semi-conductive shielding material and insulating material are wrapped around the conductor by a double-layer extrusion method, and cooled to form an inner semi-conductive shielding layer and an insulating layer;
  • the semi-conductive shielding material is a semi-conductive insulating shielding material XPB -30A
  • the insulating material is flame-retardant ethylene propylene rubber insulating material
  • the temperature zone of the extruder is: zone one 68 ⁇ 73°C, zone two 76 ⁇ 81°C, zone three 88 ⁇ 94°C, zone four 96 ⁇ 100 °C;
  • the temperature zone of the extruder is: 60 ⁇ 70°C in the first zone, 65 ⁇ 75°C in the second zone, 70 ⁇ 80°C in the third zone, 75 ⁇ 85°C in the fourth zone;
  • the first zone of the rubber extruder is the feeding section, the second and third zones are the plasticizing section, and the fourth zone is the homogenizing section;
  • the temperature zone of the extruder's nose is: 80 ⁇ 90°C in the first zone, 75 ⁇ 85°C in the second zone; among them, the first zone is the nose section and the second zone is the neck section;
  • the saturated steam pressure is maintained at 1.5 ⁇ 1.7MPa, and the water level is controlled between 20% ⁇ 30%;
  • the semi-conductive shielding tape is wrapped around the insulating layer to form an outer semi-conductive shielding layer by overlapping wrapping, the wrapping overlap rate is not less than 15%, and the thickness of the semi-conductive shielding tape is 0.12mm ⁇ 0.15mm;
  • the polyimide film is wrapped around the metal mesh by overlapping wrapping, the wrapping overlap rate is not less than 25%, and the thickness of the polyimide film is 0.025mm ⁇ 0.05mm;
  • Adopt continuous vulcanization method to uniformly and tightly squeeze the low-smoke halogen-free flame-retardant sheath material outside the cable core and cool it;
  • the sheath material is a thermosetting, low-smoke, halogen-free, flame-retardant EVA mixture, and its oxygen index is not less than 30%; a sheath die sleeve is equipped on the extruder machine-reading head; the diameter of the sheath die sleeve is larger than the outer diameter of the cable core; When the material reaches the direction of discharging, the temperature distribution of each zone of the extruder is: zone 1 50 ⁇ 60°C, zone 2 55 ⁇ 65°C, zone 3 60 ⁇ 70°C, zone 4 65 ⁇ 75°C, among which, zone 1 is In the feeding section, the second and third zones are the plasticizing section, and the fourth zone is the homogenizing section;
  • the temperature zone of the extruder head is: 65 ⁇ 80°C in the first zone, 70 ⁇ 90°C in the second zone, 70 ⁇ 80°C in the third zone; among them, the first zone is the head section and the second zone. It is the neck section of the machine, and the three zones are the die mouth section;
  • the saturated steam pressure is maintained at 1.4 ⁇ 1.6MPa, and the water level is controlled at 20% ⁇ 25%.
  • the bundled equipment is a fully automatic stranding machine from Niehofer, Germany.
  • the conductor structure is completed by a total of 3 layers of bundles. It is arranged in a 1+6+12 structure, and one is placed in the center. 6320 high-strength aramid yarns, 3 to 4 metal wires are placed in 18 holes in the outer layer to be bundled, the bundle direction is left, the bundle pitch is 40 ⁇ 3mm, the traction grade is 8, and the bundle is bundled.
  • the pitch is not more than 16 times the outer diameter after beaming.
  • Extrusion adopts the German Trest continuous vulcanization production line.
  • the temperature zone of the extruder is: 60 ⁇ 70°C in the first zone, 65 ⁇ 75°C in the second zone, 70 ⁇ 80°C in the third zone, and 75 in the fourth zone. ⁇ 85°C;
  • the temperature zone of the extruder's head is: 80 ⁇ 90°C in the first zone, 75 ⁇ 85°C in the second zone; the saturated steam pressure is maintained at 1.5 ⁇ 1.7MPa during insulation extrusion;
  • the traction speed is 18-22m/min, and the eccentricity is not more than 20%.
  • the semi-conductive shielding tape is wrapped on the surface of the insulating layer by overlapping wrapping, and the wrapping overlap rate is not less than 15%.
  • the thickness of the semi-conductive shielding tape is 0.12mm ⁇ 0.15mm.
  • the tinned metal wire is woven into a metal mesh by weaving and covers the surface of the core.
  • the braiding coverage is not less than 80%.
  • the nominal diameter of tinned metal wire is 0.12mm ⁇ 0.20mm.
  • the polyimide film is wrapped around the metal mesh by overlapping wrapping, and the wrapping overlap rate is not less than 25%.
  • the thickness of the polyimide film is 0.025mm ⁇ 0.05mm.
  • a layer of low-smoke halogen-free flame-retardant sheath is uniformly and tightly extruded outside the cable core by continuous vulcanization, and cooled:
  • Zone 1 50 ⁇ 60°C, Zone 2 55 ⁇ 65°C, Zone 3 60 ⁇ 70°C, Zone 4 65 ⁇ 75°C, of which: 1 Zone is the feeding section, Zone 2 and Zone 3 are the plasticization section, and Zone 4 is the homogenization section;
  • the temperature zone of the extruder head is: 65 ⁇ 80°C in the first zone, 70 ⁇ 90°C in the second zone, 70 ⁇ 80°C in the third zone;
  • the saturated steam pressure is maintained at 1.4 ⁇ 1.6MPa, and the water level is controlled at 20% ⁇ 25%.
  • the sheath traction speed is 15m/min, and the eccentricity is not more than 20%.
  • step 3 the semi-conductive shielding material is extruded outside the surface of the insulated core by means of extrusion, with a nominal thickness of 1.0 mm.
  • Example 1 The difference from Example 1 is only in the step 4): the copper metal tape is wrapped on the surface of the insulated wire core by overlapping wrapping, and the wrapping overlap rate is not less than 15%.
  • the nominal thickness of copper metal strip is controlled within 0.1mm ⁇ 0.12mm.
  • Example 1 has the highest yield rate of cables, reaching 99.3%, Example 2 reaching 98.7%, and Example 3 reaching 98.9%. It can be seen from this result that for the outer semi-conductive shielding layer, the process of wrapping the semi-conductive shielding tape in Example 1 is 0.6% higher than the process of extruding the semi-conductive shielding material in Example 2. And Example 3 also adopts the process of wrapping semi-conductive shielding tape, and its yield rate is also higher than that of Example 2.
  • Example 1 the main difference is the metal braid and the metal belt. From the bending performance of the cable, the structure of Example 1 is naturally due to the structure of Example 3. Since the cable structure has inner and outer semi-conductive shielding layers, and a metal wire mesh with a suitable structure, its shielding performance can meet the requirements of use.
  • the cable was prepared using the method of Example 1 for testing.
  • the tinned metal wire braided wire is 0.15mm
  • the thickness of the polyimide film is 0.025mm
  • the nominal thickness of the semi-conductive shielding tape is 0.12mm.
  • the temperature zone of the extruder's body is: zone one 70°C, zone two 78°C, zone three 91°C, zone four 98°C;
  • the temperature zone of the extruder's body is: 65°C in the first zone, 70°C in the second zone, 75°C in the third zone, and 80°C in the fourth zone;
  • the temperature zone of the extruder's head is: 85°C in the first zone, and two Zone 80°C;
  • the saturated steam pressure is maintained at 1.6MPa during insulation extrusion;
  • Step 6) Parameters:
  • the temperature zone of the extruder's body is: 55°C in the first zone, 60°C in the second zone, 65°C in the third zone, and 70°C in the fourth zone;
  • the extruder's head temperature zone is: 75°C in the first zone,
  • the second zone is 80°C and the third zone is 75°C;
  • the saturated steam pressure is maintained at 1.5MP when the jacket is extruded.
  • the finished cables passed the AC withstand voltage test of 21kV*5 minutes and the DC withstand voltage test of 60kV*15 minutes.
  • the finished cable's gamma-ray radiation dose has reached 1000kGy
  • the finished cable After a third-party type test, the finished cable has a heat-resistant aging life of more than 60 years.
  • the finished cable meets the vertical burning test of a single cable specified in GB/T18380.12.

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  • Manufacturing & Machinery (AREA)
  • Insulated Conductors (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un câble à courant continu haute tension à faible section transversale résistant aux rayonnements pour centrale nucléaire, la plage nominale de section transversale d'un conducteur du câble est de 4 à 10 mm 2. Le câble a une structure comprenant : un conducteur, une couche de blindage semi-conductrice interne, une couche d'isolation, une couche de blindage semi-conductrice externe, une couche de protection métallique, une couche de film de polyimide et une gaine en séquence de l'intérieur vers l'extérieur. Les étapes de fabrication du câble consiste à : (1) Fabriquer un conducteur ; (2) envelopper un matériau de blindage semi-conducteur et un matériau d'isolation à l'extérieur du conducteur d'une manière d'extrusion à double couche ; (4) envelopper une couche de blindage métallique à l'extérieur d'une couche de blindage semi-conductrice externe ; (5) envelopper un film de polyimide à l'extérieur d'un treillis métallique d'une manière d'enveloppement en chevauchement ; et (6) extruder de manière uniforme et serrée un matériau de gaine ignifuge à faible dégagement de fumée à l'extérieur d'un noyau de câble d'une manière de vulcanisation continue, et le refroidissement de celui-ci, le matériau de gaine étant un mélange EVA ignifuge sans halogène à faible dégagement de fumée thermodurcissable, et son indice d'oxygène n'étant pas inférieur à 30 %. Le câble fabriqué par l'utilisation du procédé peut satisfaire aux exigences de conception et a un taux de passe élevé.
PCT/CN2020/111930 2019-10-15 2020-08-27 Câble à courant continu haute tension à faible section transversale résistant aux rayonnements pour centrale nucléaire et son procédé de fabrication WO2021073272A1 (fr)

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US20200187308A1 (en) * 2018-12-07 2020-06-11 Nvent Services Gmbh Flammability of Heating Cable
CN113871064A (zh) * 2021-08-24 2021-12-31 江苏上上电缆集团有限公司 一种105℃耐扭风能电缆的制造方法及电缆
CN113972038A (zh) * 2021-11-04 2022-01-25 江苏上上电缆集团有限公司 一种特种装备用复合电缆的制造方法
WO2023040054A1 (fr) * 2021-09-16 2023-03-23 江苏上上电缆集团有限公司 Procédé de fabrication d'un câble électrique à énergie éolienne résistant à la torsion, à moyenne pression, isolé par éthylène-propylène, sans halogène et à faible émission de fumée, et câble
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CN114883054B (zh) * 2022-04-13 2023-08-22 江苏上上电缆集团有限公司 乙丙绝缘熔断器电缆的制造方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200187308A1 (en) * 2018-12-07 2020-06-11 Nvent Services Gmbh Flammability of Heating Cable
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CN113972038B (zh) * 2021-11-04 2023-08-22 江苏上上电缆集团有限公司 一种特种装备用复合电缆的制造方法
CN117986662A (zh) * 2023-12-20 2024-05-07 上海歆昕缘电器设备安装有限公司 一种低烟无卤电缆及其制备方法

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