WO2019114533A1 - 一种抗水树中压乙丙绝缘电缆的制造方法及电缆 - Google Patents

一种抗水树中压乙丙绝缘电缆的制造方法及电缆 Download PDF

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WO2019114533A1
WO2019114533A1 PCT/CN2018/117531 CN2018117531W WO2019114533A1 WO 2019114533 A1 WO2019114533 A1 WO 2019114533A1 CN 2018117531 W CN2018117531 W CN 2018117531W WO 2019114533 A1 WO2019114533 A1 WO 2019114533A1
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temperature
zone
zones
layer
insulating
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PCT/CN2018/117531
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English (en)
French (fr)
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汤陈旦
刘雄军
凌国桢
袁杰
殷赛莲
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江苏上上电缆集团有限公司
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Publication of WO2019114533A1 publication Critical patent/WO2019114533A1/zh

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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
    • H01B13/0016—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
    • H01B13/002—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment for heat extraction
    • 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
    • H01B13/148—Selection of the insulating material therefor
    • 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
    • H01B7/02—Disposition of insulation
    • H01B7/0275—Disposition of insulation comprising one or more extruded layers of insulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—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

Definitions

  • the technical solution relates to the technical field of cables, and specifically relates to a method and a cable for manufacturing a water-resistant tree medium voltage ethylene-propylene insulated cable.
  • Water-resistant tree growth agents are a key factor in cable water tree performance. Improper manufacturing processes can damage the water tree performance and electrical performance of the cable.
  • the structural technology is generally cured, less than a last resort. It is not convenient to make adjustments to production adaptability. Therefore, in the case of a new cable structure using a water-resistant tree growth agent, it is generally difficult to produce a high-quality, high-performance cable by the production method of the conventional structural cable.
  • the present invention provides a new structure of water-resistant tree medium voltage EPR insulated cable and a method of manufacturing the same.
  • a water-resistant tree medium-voltage ethylene-propylene insulated cable the structure is: around the same axis, from the inside to the outside is a conductor, a conductor shielding layer, an insulating layer, an insulating shielding layer and a sheath layer;
  • each of the medium-sized conductors is wound outside the insulating shielding layer and closely adhered to the outer wall of the insulating shielding layer; the spacing between adjacent neutral conductors is the same, and the spacing is greater than 0;
  • the neutral conductor is a conductor used to connect to the neutral point of the power system
  • the conductive shielding layer is composed of a cross-linked polyethylene semi-conductive shielding material;
  • the insulating layer is composed of an EPDM rubber insulating material; and the insulating shielding layer is a rubber semi-conductive shielding material;
  • the sleeve is made of polyethylene sheathing material;
  • the cross-sectional area of the conductor is not less than 500 mm 2 ; the thickness of the conductor shielding layer is not less than 0.61 mm; the thickness of the insulating layer is 5.33 to 6.35 mm; the thickness of the insulating shielding layer is 1.40 to 2.67 mm; and the thickness of the sheath layer is 1.78 - 3.05mm;
  • the method for manufacturing the cable includes the following steps:
  • the copper monofilament or the aluminum monofilament is twisted and pressed to form a conductor having a circular cross section; the cross sectional area of the conductor is not less than 500 mm 2 ;
  • the semi-conductive nylon tape is wrapped around the conductor, and then the cross-linked polyethylene semi-conductive shielding material is extruded outside;
  • the semi-conductive nylon belt has a nominal thickness of 0.1 to 0.15 mm (optimally 0.12 mm), and the minimum coverage ratio is not less than 50% (optimally 65%);
  • the semi-conductive nylon strip is dried before use, the drying temperature is 50-60 ° C, the drying time is not less than 24 h; after cooling to normal temperature, it is sealed and stored in time; the semi-conductive nylon strip after drying should be within 12 h. finish using;
  • the semi-conductive nylon tape which has not been used in the production process and has been opened, it shall be sealed and stored in time; the semi-conductive nylon tape conductor shall be transferred to the next process step within 72 hours after the completion of the semi-conductive tape wrapping;
  • the extruded cross-linked polyethylene semi-conductive shielding material, the EPDM rubber insulating material and the semi-conductive insulating shielding material XPB-30A are manufactured by a rubber extrusion machine by a three-layer co-extrusion process.
  • the three-layer coextrusion process requirements are:
  • the core is obtained by steps 1) to 4); the bare copper wire is wound outside the insulating shielding layer of the wire core; the direction of the winding is rightward, and the diameter ratio of the sparse winding is 6-10;
  • the number of bare copper wires is 6 to 32; the wire diameter of bare copper wire is 1.29 to 3.26 mm; the tension of bare copper wire is 15 to 30 N;
  • the non-woven fabric tape is wrapped around the outer gap of the bare copper wire, and the wrapping direction is leftward;
  • the tension range of the non-woven fabric tape wrapping is: 5 to 10N; the non-woven fabric tape is in a non-covering state, and the non-woven fabric tape has a gap range of 5 to 10 mm;
  • step 6) Put the coil of step 5) on the pay-off machine of the sheath extrusion production line, remove the non-woven fabric tape in step 5 while releasing the thread; and then squeeze the sheath material by the extruder of the extrusion production line. .
  • a color strip may be embedded in the outer wall of the sheath layer for identification.
  • the temperature control of the three-layer co-extrusion body is as follows:
  • the temperature range of the cross-linked polyethylene semi-conductive shielding material is 76-83 ° C, the temperature range of the two zones is 88-92 ° C, and the temperature range of the three zones is 94-98 ° C;
  • the temperature range of the EPDM rubber insulation material is 66-72 ° C, the temperature range of the second zone is 78-84 ° C, and the temperature range of the three zones is 87-91 ° C;
  • the temperature range of the semi-conductive insulating shielding material is 68-73 ° C, the temperature range of the two zones is 76-81 ° C, the temperature range of the three zones is 88-94 ° C, and the temperature range of the four zones is 96-100 ° C;
  • one zone is the feeding section
  • the second zone and the third zone are plasticized sections
  • the four zones are homogenization sections
  • the temperature unit of the head unit of the rubber extrusion machine is: the temperature range of one zone is 94-98 ° C, the temperature range of the second zone is 95-96 ° C, and the temperature range of the three zones is 89-92 ° C;
  • one area is the nose section
  • the second section is the neck section
  • the third zone is the die section
  • Cooling is cooled by cold water
  • the temperature distribution of each body of the extruder is: a temperature range of 152 to 158 ° C in one zone, a temperature range of 160 to 166 ° C in the second zone, and a temperature range of three zones It is 173 ⁇ 180 ° C, the temperature range of the four zones is 182 ⁇ 188 ° C, of which: one zone is the feeding section, the second zone and the third zone are plasticized sections, and the four zones are homogenization sections;
  • the temperature of the head unit of the extruder is: the temperature range of the machine head is 182-188 ° C, the temperature range of the neck is 182-188 ° C, and the temperature of the die is 182-188 ° C;
  • the jacket should be cooled by section.
  • the water temperature of the first section of the cooling tank is 60-70 °C, and the other sections are made of normal temperature water.
  • Figure 1 is a schematic cross-sectional view of a cable obtained by the method of the present example
  • a water-resistant tree medium-voltage ethylene-propylene insulated cable has a structure of: a conductor, a conductor shielding layer, an insulating layer, an insulating shielding layer and a sheath layer in order from the inside to the outside;
  • each of the medium-sized conductors is wound outside the insulating shielding layer and closely adhered to the outer wall of the insulating shielding layer; the spacing between adjacent neutral conductors is the same, and the spacing is greater than 0;
  • the neutral conductor is a conductor used to connect to the neutral point of the power system
  • the conductive shielding layer is composed of a cross-linked polyethylene semi-conductive shielding material (the selected article number is YPJ-10);
  • the insulating layer is composed of EPDM rubber insulation material (the designation number is XJ-30B, which contains water-resistant tree growth agent).
  • the insulating shielding layer is composed of a rubber semi-conductive shielding material (carbon black doped rubber insulating material, which is selected as XPB-30A in this embodiment);
  • the sheath layer is composed of a polyethylene sheathing material (LLDPE linear low density polyethylene is used in this embodiment);
  • the cross-sectional area of the conductor is not less than 500 mm 2 ; the thickness of the conductor shielding layer is not less than 0.61 mm; the thickness of the insulating layer is 5.33 to 6.35 mm; the thickness of the insulating shielding layer is 1.40 to 2.67 mm; and the thickness of the sheath layer is 1.78 - 3.05mm;
  • the method for manufacturing the cable includes the following steps:
  • the copper monofilament or the aluminum monofilament is twisted and pressed to form a conductor having a circular cross section; the cross sectional area of the conductor is not less than 500 mm 2 ;
  • the semi-conductive nylon tape is wrapped around the conductor, and then the cross-linked polyethylene semi-conductive shielding material is extruded outside;
  • the semi-conductive nylon belt has a nominal thickness of 0.1 to 0.15 mm (tested, preferably 0.12 mm), and the minimum mulching rate is not less than 50% (optimally 65% after testing);
  • the semi-conductive nylon strip is dried before use, the drying temperature is 50-60 ° C, the drying time is not less than 24 h; after cooling to normal temperature, it is sealed and stored in time; the semi-conductive nylon strip after drying should be within 12 h. finish using;
  • the semi-conductive nylon tape which has not been used in the production process and has been opened, it shall be sealed and stored in time; the semi-conductive nylon tape conductor shall be transferred to the next process step within 72 hours after the completion of the semi-conductive tape wrapping;
  • the extruded cross-linked polyethylene semi-conductive shielding material, the EPDM rubber insulating material and the semi-conductive insulating shielding material XPB-30A are manufactured by a rubber extrusion machine by a three-layer co-extrusion process.
  • the three-layer coextrusion process requirements are:
  • the core is obtained from steps 1) to 4); the bare copper wire is wound outside the insulating shield of the wire core (ie, the neutral conductor in the figure); the direction of the winding is rightward, and the ratio of the spalling pitch is 6 ⁇ 10;
  • the number of bare copper wires is 6 to 32; the wire diameter of bare copper wire is 1.29 to 3.26 mm; the tension of bare copper wire is 15 to 30 N;
  • the non-woven fabric tape is wrapped around the outer gap of the bare copper wire, and the wrapping direction is leftward;
  • the tension range of the non-woven fabric tape wrapping is: 5 to 10N; the non-woven fabric tape is in a non-covering state, and the non-woven fabric tape has a gap range of 5 to 10 mm;
  • step 6) Put the coil of step 5) on the pay-off machine of the sheath extrusion production line, remove the non-woven fabric tape in step 5 while releasing the thread; and then squeeze the sheath material by the extruder of the extrusion production line. .
  • a color strip may be embedded in the outer wall of the sheath layer for identification.
  • the temperature control of the three-layer co-extrusion body is as follows:
  • the temperature range of the cross-linked polyethylene semi-conductive shielding material is 76-83 ° C, the temperature range of the two zones is 88-92 ° C, and the temperature range of the three zones is 94-98 ° C;
  • the temperature range of the EPDM rubber insulation material is 66-72 ° C, the temperature range of the second zone is 78-84 ° C, and the temperature range of the three zones is 87-91 ° C;
  • the temperature range of the semi-conductive insulating shielding material is 68-73 ° C, the temperature range of the two zones is 76-81 ° C, the temperature range of the three zones is 88-94 ° C, and the temperature range of the four zones is 96-100 ° C;
  • one zone is the feeding section
  • the second zone and the third zone are plasticized sections
  • the four zones are homogenization sections
  • the temperature unit of the head unit of the rubber extrusion machine is: the temperature range of one zone is 94-98 ° C, the temperature range of the second zone is 95-96 ° C, and the temperature range of the three zones is 89-92 ° C;
  • one area is the nose section
  • the second section is the neck section
  • the third zone is the die section
  • Cooling is cooled by cold water
  • the temperature distribution of each body of the extruder is: a temperature range of 152 to 158 ° C in one zone, a temperature range of 160 to 166 ° C in the second zone, and a temperature range of three zones It is 173 ⁇ 180 ° C, the temperature range of the four zones is 182 ⁇ 188 ° C, of which: one zone is the feeding section, the second zone and the third zone are plasticized sections, and the four zones are homogenization sections;
  • the temperature of the head unit of the extruder is: the temperature range of the machine head is 182-188 ° C, the temperature range of the neck is 182-188 ° C, and the temperature of the die is 182-188 ° C;
  • the jacket should be cooled by section.
  • the water temperature of the first section of the cooling tank is 60-70 °C, and the other sections are made of normal temperature water.
  • the temperature control of the three-layer co-extrusion body is as follows:
  • the temperature of the cross-linked polyethylene semi-conductive shielding material is 76 ° C, the temperature of the second zone is 88 ° C, and the temperature of the three zones is 98 ° C;
  • the temperature of the EPDM insulation material is 66 ° C, the temperature of the second zone is 84 ° C, and the temperature of the three zones is 87 ° C;
  • the temperature of the semi-conductive insulating shielding material is 73 ° C, the temperature of the two zones is 76 ° C, the temperature of the three zones is 88 ° C, and the temperature of the four zones is 100 ° C;
  • the temperature unit of the head unit of the rubber extrusion machine is: the temperature of one zone is 94 ° C, the temperature of the second zone is 95 ° C, and the temperature of the three zones is 92 ° C;
  • the temperature distribution of the fuselage of each body of the extruder is: the temperature of one zone is 152 ° C, the temperature of the second zone is 166 ° C, the temperature of the three zones is 180 ° C, and the temperature of the four zones Is 182 ° C;
  • the temperature of the head unit of the extruder is: the temperature of the machine head is 182 ° C, the temperature of the neck is 182 ° C, and the temperature of the die is 182 ° C;
  • the jacket should be cooled by section.
  • the water temperature of the first section of the cooling tank is 60 °C, and the other sections are made of normal temperature water.
  • the temperature control of the three-layer co-extrusion body is as follows:
  • the temperature of the cross-linked polyethylene semi-conductive shielding material is 83 ° C, the temperature of the second zone is 92 ° C, and the temperature of the three zones is 94 ° C;
  • the temperature of the EPDM insulation material is 72 ° C, the temperature of the second zone is 78 ° C, and the temperature of the three zones is 91 ° C;
  • the temperature of the semi-conductive insulating shielding material is 68 ° C, the temperature of the two zones is 81 ° C, the temperature of the three zones is 94 ° C, and the temperature of the four zones is 96 ° C;
  • the temperature unit of the head unit of the rubber extruder is: the temperature of one zone is 98 ° C, the temperature of the second zone is 96 ° C, and the temperature of the three zones is 89 ° C;
  • the temperature distribution of the fuselage of each body of the extruder is: a zone temperature of 158 ° C, a zone temperature of 160 ° C, a zone temperature of 173 ° C, and a temperature of four zones. Is 188 ° C;
  • the temperature of the head unit of the extruder is: the temperature range of the machine head is 188 ° C, the temperature range of the neck is 188 ° C, and the temperature of the die is 188 ° C;
  • the jacket should be cooled by section.
  • the water temperature of the first section of the cooling tank is 70 °C, and the other sections are made of normal temperature water.
  • the temperature control of the three-layer co-extrusion body is as follows:
  • the cross-linked polyethylene semi-conductive shielding material is extruded at a temperature of 80 ° C, the temperature of the second zone is 90 ° C, and the temperature of the three zones is 95 ° C;
  • the temperature of the EPDM rubber insulation material is 70 ° C, the temperature of the second zone is 80 ° C, and the temperature of the three zones is 90 ° C;
  • the temperature of the semi-conductive insulating shielding material is 70 ° C, the temperature of the two zones is 80 ° C, the temperature of the three zones is 90 ° C, and the temperature of the four zones is 100 ° C;
  • the temperature unit of the head unit of the rubber extrusion machine is: the temperature of one zone is 95 °C, the temperature of the second zone is 95 °C, and the temperature of the three zones is 90 °C; one zone is the head section, two The area is the neck section and the third section is the die section;
  • Cooling is cooled by cold water
  • the temperature distribution of the fuselage of each body of the extruder is: the temperature of one zone is 155 ° C, the temperature of the second zone is 165 ° C, the temperature of the three zones is 175 ° C, and the temperature of the four zones It is 185 °C, in which: one zone is the feeding section, the second zone and the third zone are plasticizing sections, and the four zones are homogenizing sections;
  • the temperature of the head unit of the extruder is: the temperature of the machine head is 185 ° C, the temperature of the neck is 185 ° C, and the temperature of the die is 185 ° C;
  • the jacket should be cooled by section.
  • the water temperature of the first stage cooling water tank is 68 °C, and the other sections are all normal temperature water.
  • the electrical properties of the cables obtained by the methods 1 to 3 can reach the standard and are qualified.
  • the yield of the cable produced in the example 1 was 98.7%, the yield of the cable produced in the example 2 was 99.5%, and the yield of the cable produced in the example 3 was 99.8%.
  • test basis ICEA S-94-649
  • the original tensile strength is 14.4 MPa (required ⁇ 8.2 MPa);
  • the original elongation at break is 480% (required ⁇ 250%);
  • the tensile strength retention rate is 92% (required ⁇ 80%);
  • the elongation at break retention rate is 94% (required ⁇ 80%);
  • the maximum elongation under load is 10% (required ⁇ 50%);
  • the maximum extension after cooling is 0 (required ⁇ 5%);
  • the elongation at break is 860% (required to be ⁇ 300%);
  • Tensile strength retention rate is 90% (required ⁇ 75%)
  • the elongation at break retention rate is 85% (required ⁇ 75%);
  • the interface between the extruded conductor shield and the insulation does not have micropores greater than 0.076 mm.
  • the insulation shielding indentation is 0.182mm (required to be ⁇ 0.381mm);
  • the DC resistance of the conductor at 7, 25 degrees Celsius is 0.164 ⁇ /km (required to be ⁇ 0.171 ⁇ /km);
  • the insulation resistance at 15.6 degrees Celsius is 10200 M ⁇ km (required to be ⁇ 6080 M ⁇ km).
  • Partial discharge test (35kV) is 1.8PC (required ⁇ 5PC);
  • Capacitance (15kV, room temperature) is 322pF/m;
  • each voltage value lasts for 5 minutes until breakdown.
  • the AC breakdown voltage is 143.5kV, and the maintenance time is 2 minutes and 46 seconds;
  • AC withstand voltage rating 136.5kV (required is ⁇ 19.7kV);
  • the conductor temperature is 125 to 130 degrees Celsius
  • the breakdown voltage is 220kV
  • the breakdown voltage level is 192.5kV
  • the minimum impact withstand voltage is 43.75 kV/mm (required is ⁇ 31.5 kV).
  • Partial discharge test (35kV) is 2.1PC (required ⁇ 5PC);
  • Capacitance (15kV, room temperature) is 322pF/m;
  • each voltage value lasts for 5 minutes until breakdown.
  • the AC breakdown voltage is 136.5kV, and the maintenance time is 3 minutes and 28 seconds;
  • AC withstand voltage rating 129.5kV (required is ⁇ 19.7kV);
  • each voltage value lasts for 5 minutes until breakdown.
  • AC withstand voltage rating 129.5kV (required is ⁇ 19.7kV);
  • each voltage value lasts for 5 minutes until breakdown.
  • AC withstand voltage rating 122.5kV (required is ⁇ 19.7kV);

Abstract

一种抗水树中压乙丙绝缘电缆的制造方法及电缆，电缆的结构为：围绕同一轴线，自内而外依次是导体、导体屏蔽层、绝缘层、绝缘屏蔽层和护套层；构成所述导体屏蔽层的是交联聚乙烯半导电屏蔽料；构成所述绝缘层的是三元乙丙橡胶绝缘料；构成所述绝缘屏蔽层的是橡胶半导电屏蔽料；构成所述护套层的是聚乙烯护套料。所述电缆的制造方法，其步骤包括：1)制造导体、2)制造导体屏蔽层、3)制造绝缘层、4)制造绝缘屏蔽层、5)疏绕裸铜丝、6)挤包护套料。本方法制得电缆的电缆电性能和机械性能均高于标准要求。

Description

一种抗水树中压乙丙绝缘电缆的制造方法及电缆 技术领域
本技术方案涉及电缆技术领域，确切的说是一种抗水树中压乙丙绝缘电缆的制造方法及电缆。
背景技术
抗水树生长剂是电缆抗水树性能的关键因素。制造工艺安排不当可能会破坏电缆的抗水树性能和电性能。
尤其是对于用到抗水树生长剂的新的电缆结构，由于新的电缆结构设计综合考虑到电缆的机械和电性能，所以，一般来说其结构技术是固化的，不到万不得已情况下，不便于再做生产适应性的调整。所以，针对新的用到抗水树生长剂的电缆结构，沿用以往结构电缆的生产方法通常情况下是难以制得高质量、高性能电缆的。
发明内容
为了解决现有技术中存在的上述问题，本发明提出一种新结构的抗水树中压乙丙绝缘电缆及其制造方法。
一种抗水树中压乙丙绝缘电缆，其结构为：围绕同一轴线，自内而外依次是导体、导体屏蔽层、绝缘层、绝缘屏蔽层和护套层；
在护套层内嵌有多根中性导体，各根中型导体绕在绝缘屏蔽层外，且与绝缘屏蔽层的外壁密贴；相邻中性导体之间的间距相同，且间距大于0；
(中性导体是用于与电力系统中性点连接的导体)
构成所述导体屏蔽层的是交联聚乙烯半导电屏蔽料；构成所述绝缘层的是三元乙丙橡胶绝缘料；构成所述绝缘屏蔽层的是橡胶半导电屏蔽料；构成所述护套层的是聚乙烯护套料；
所述导体的截面积不小于500mm 2；导体屏蔽层的厚度不小于0.61mm；绝缘层的厚度为5.33～6.35mm；绝缘屏蔽层的厚度为1.40～2.67mm；护套层的厚度为1.78～3.05mm；
所述电缆的制造方法，其步骤包括：
1)制造导体：
把由铜单丝或铝单丝绞合压紧构成截面是圆形的导体；导体的截面积不小于500mm 2；
2)制造导体屏蔽层：
先把半导电尼龙带绕包在导体外，再在其外挤包交联聚乙烯半导电屏蔽料；
半导电尼龙带标称厚度为0.1～0.15mm(最优为0.12mm)，最小搭盖率不小于50％(最优为65％)；
所述半导电尼龙带在使用前烘干，烘干温度为50～60℃，烘干时间不少于24h；冷却至常温后及时密封保存；经烘干处理的半导电尼龙带应在12h内使用完；
对于生产过程中未使用完并且已开封的半导电尼龙带应及时进行密封保存；绕包半导电尼龙带导体应在半导电带绕包完成后72h内转入下道工序步骤进行生产；
3)制造绝缘层：
在导体屏蔽层外挤包三元乙丙橡胶绝缘料，构成绝缘层；
4)制造绝缘屏蔽层：
在绝缘层外挤包半导电绝缘屏蔽料XPB-30A构成绝缘屏蔽层；
所述步骤2)～4)中，挤包交联聚乙烯半导电屏蔽料、三元乙丙橡胶绝缘料和半导电绝缘屏蔽料XPB-30A是采用三层共挤工艺由挤橡机制造，三层共挤的工艺要求为：
5)由步骤1)～4)制得线芯；在线芯的绝缘屏蔽层外疏绕裸铜丝；疏绕方向为右向，疏绕节径比为6～10；
裸铜丝的数量为6～32根；裸铜丝的线径范围为：1.29～3.26mm；裸铜丝疏绕时候的张力范围为15～30N；
再在裸铜丝外间隙绕包无纺布带，绕包方向为左向；
无纺布带绕包时候的张力范围为：5～10N；无纺布带为非搭盖状态，无纺布带间隙范围为：5～10mm；
最后采用光洁铁盘收线；
6)把步骤5)得到线盘装在护套挤包生产线的放线机上，边放线边取下步骤5中的无纺布带；再由挤包生产线的挤塑机挤包护套料。
所述护套层的外壁内可以嵌有色条，用以标识。
所述步骤4)中，自进料到出料方向，三层共挤机身温度控制如下：
交联聚乙烯半导电屏蔽料挤出一区温度范围是76～83℃、二区温度范围是88～92℃、三区温度范围是94～98℃；
三元乙丙橡胶绝缘料挤出一区温度范围是66～72℃、二区温度范围是78～84℃、三区温度范围是87～91℃；
半导电绝缘屏蔽料挤出一区温度范围是68～73℃、二区温度范围是76～81℃、三区温度范围是88～94℃、四区温度范围是96～100℃；
其中：一区为入料段，二区和三区为塑化段，四区为均化段；
自进料到出料方向，挤橡机的机头单元温区为：一区温度范围是94～98℃、二区温度范围是95～96℃、三区温度范围是89～92℃；
其中：一区为机头段、二区为机颈段、三区为模口段；
冷却是采用冷水冷却；
所述步骤6)中，自进料到出料方向，挤塑机的机身各区温度分布为：一区温度范围是152～158℃、二区温度范围是160～166℃、三区温度范围是173～180℃、四区温度范围是182～188℃，其中：一区为入料段，二区和三区为塑化段，四区为均化段；
挤塑机的机头单元温度为：机头为温度范围是182～188℃、机颈为温度范围是182～188℃、模口为温度范围是182～188℃；
护套应采用分段冷却，第一段冷却水槽水温为60～70℃，其它段均采用常温水。
附图说明
图1是本例方法制得的电缆截面示意图，
图中：1——导体；2——导体屏蔽层；3——绝缘层；4——绝缘屏蔽层；5——中性导体(裸铜丝)；6——护套层；7——色条。
具体实施方式
下面结合附图与具体实施方式对本案进行说明：
如图1所示的一种抗水树中压乙丙绝缘电缆，其结构为：围绕同一轴线，自内而外依次是导体、导体屏蔽层、绝缘层、绝缘屏蔽层和护套层；
在护套层内嵌有多根中性导体，各根中型导体绕在绝缘屏蔽层外，且与绝缘屏蔽层的外壁密贴；相邻中性导体之间的间距相同，且间距大于0；
(中性导体是用于与电力系统中性点连接的导体)
构成所述导体屏蔽层的是交联聚乙烯半导电屏蔽料(本实施例选牌号为YPJ-10)；
构成所述绝缘层的是三元乙丙橡胶绝缘料(本实施例选牌号为XJ-30B，含有抗水树生长剂)
构成所述绝缘屏蔽层的是橡胶半导电屏蔽料(掺杂炭黑的橡胶绝缘料，本实施例选牌号为XPB-30A)；
构成所述护套层的是聚乙烯护套料(本实施例选用LLDPE线性低密度聚乙烯)；
所述导体的截面积不小于500mm 2；导体屏蔽层的厚度不小于0.61mm；绝缘层的厚度为5.33～6.35mm；绝缘屏蔽层的厚度为1.40～2.67mm；护套层的厚度为1.78～3.05mm；
所述电缆的制造方法，其步骤包括：
1)制造导体：
把由铜单丝或铝单丝绞合压紧构成截面是圆形的导体；导体的截面积不小于500mm 2；
2)制造导体屏蔽层：
先把半导电尼龙带绕包在导体外，再在其外挤包交联聚乙烯半导电屏蔽料；
半导电尼龙带标称厚度为0.1～0.15mm(经试验，最优为0.12mm)，最小搭盖率不小于50％(经试验，最优为65％)；
所述半导电尼龙带在使用前烘干，烘干温度为50～60℃，烘干时间不少于24h；冷却至常温后及时密封保存；经烘干处理的半导电尼龙带应在12h内使用完；
对于生产过程中未使用完并且已开封的半导电尼龙带应及时进行密封保存；绕包半导电尼龙带导体应在半导电带绕包完成后72h内转入下道工序步骤进行生产；
3)制造绝缘层：
在导体屏蔽层外挤包三元乙丙橡胶绝缘料，构成绝缘层；
4)制造绝缘屏蔽层：
在绝缘层外挤包半导电绝缘屏蔽料XPB-30A构成绝缘屏蔽层；
所述步骤2)～4)中，挤包交联聚乙烯半导电屏蔽料、三元乙丙橡胶绝缘料和半导电绝缘屏蔽料XPB-30A是采用三层共挤工艺由挤橡机制造，三层共挤的工艺要求为：
5)由步骤1)～4)制得线芯；在线芯的绝缘屏蔽层外疏绕裸铜丝(即图中的中性导体)；疏绕方向为右向，疏绕节径比为6～10；
裸铜丝的数量为6～32根；裸铜丝的线径范围为：1.29～3.26mm；裸铜丝疏绕时候的张力范围为15～30N；
再在裸铜丝外间隙绕包无纺布带，绕包方向为左向；
无纺布带绕包时候的张力范围为：5～10N；无纺布带为非搭盖状态，无纺布带间隙范围为：5～10mm；
最后采用光洁铁盘收线；
6)把步骤5)得到线盘装在护套挤包生产线的放线机上，边放线边取下步骤5中的无纺布带；再由挤包生产线的挤塑机挤包护套料。
所述护套层的外壁内可以嵌有色条，用以标识。
本电缆的生产方法中，各层电缆料的工艺控制对于电缆本身的加工质量以及产品的电性能影响较大，故采用如下工艺要求加以控制：
所述步骤4)中，自进料到出料方向，三层共挤机身温度控制如下：
交联聚乙烯半导电屏蔽料挤出一区温度范围是76～83℃、二区温度范围是88～92℃、三区温度范围是94～98℃；
三元乙丙橡胶绝缘料挤出一区温度范围是66～72℃、二区温度范围是78～84℃、三区温度范围是87～91℃；
半导电绝缘屏蔽料挤出一区温度范围是68～73℃、二区温度范围是76～81℃、三区温度范围是88～94℃、四区温度范围是96～100℃；
其中：一区为入料段，二区和三区为塑化段，四区为均化段；
自进料到出料方向，挤橡机的机头单元温区为：一区温度范围是94～98℃、二区温度范围是95～96℃、三区温度范围是89～92℃；
其中：一区为机头段、二区为机颈段、三区为模口段；
冷却是采用冷水冷却；
所述步骤6)中，自进料到出料方向，挤塑机的机身各区温度分布为：一区温度范围是152～158℃、二区温度范围是160～166℃、三区温度范围是173～180℃、四区温度范围是182～188℃，其中：一区为入料段，二区和三区为塑化段，四区为均化段；
挤塑机的机头单元温度为：机头为温度范围是182～188℃、机颈为温度范围是182～188℃、模口为温度范围是182～188℃；
护套应采用分段冷却，第一段冷却水槽水温为60～70℃，其它段均采用常温水。
例1：
所述步骤4)中，自进料到出料方向，三层共挤机身温度控制如下：
交联聚乙烯半导电屏蔽料挤出一区温度是76℃、二区温度是88℃、三区温度是98℃；
三元乙丙橡胶绝缘料挤出一区温度是66℃、二区温度是84℃、三区温度是87℃；
半导电绝缘屏蔽料挤出一区温度是73℃、二区温度是76℃、三区温度是88℃、四区温度是100℃；
自进料到出料方向，挤橡机的机头单元温区为：一区温度是94℃、二区温度是95℃、三区温度是92℃；
所述步骤6)中，自进料到出料方向，挤塑机的机身各区温度分布为：一区温度是152℃、二区温度是166℃、三区温度是180℃、四区温度是182℃；
挤塑机的机头单元温度为：机头为温度是182℃、机颈为温度是182℃、模口为温度是182℃；
护套应采用分段冷却，第一段冷却水槽水温为60℃，其它段均采用常温水。
例2
所述步骤4)中，自进料到出料方向，三层共挤机身温度控制如下：
交联聚乙烯半导电屏蔽料挤出一区温度是83℃、二区温度是92℃、三区温度是94℃；
三元乙丙橡胶绝缘料挤出一区温度是72℃、二区温度是78℃、三区温度是91℃；
半导电绝缘屏蔽料挤出一区温度是68℃、二区温度是81℃、三区温度是94℃、四区温度是96℃；
自进料到出料方向，挤橡机的机头单元温区为：一区温度是98℃、二区温度是96℃、三区温度是89℃；
所述步骤6)中，自进料到出料方向，挤塑机的机身各区温度分布为：一区温度是158℃、二区温度是160℃、三区温度是173℃、四区温度是188℃；
挤塑机的机头单元温度为：机头为温度范围是188℃、机颈为温度范围是188℃、模口为温度范围是188℃；
护套应采用分段冷却，第一段冷却水槽水温为70℃，其它段均采用常温水。
例3：
所述步骤4)中，自进料到出料方向，三层共挤机身温度控制如下：
交联聚乙烯半导电屏蔽料挤出一区温度是80℃、二区温度是90℃、三区温度是95℃；
三元乙丙橡胶绝缘料挤出一区温度是70℃、二区温度是80℃、三区温度是90℃；
半导电绝缘屏蔽料挤出一区温度是70℃、二区温度是80℃、三区温度是90℃、四区温度是100℃；
自进料到出料方向，挤橡机的机头单元温区为：一区温度是95℃、二区温度是95℃、三区温度是90℃；其中，一区为机头段、二区为机颈段、三区为模口段；
冷却是采用冷水冷却；
所述步骤6)中，自进料到出料方向，挤塑机的机身各区温度分布为：一区温度是155℃、二区温度是165℃、三区温度是175℃、四区温度是185℃，其中：一区为入料段，二区和三区为塑化段，四区为均化段；
挤塑机的机头单元温度为：机头为温度是185℃、机颈为温度是185℃、模口为温度是185℃；
护套应采用分段冷却，第一段冷却水槽水温为68℃，其它段均采用常温水。
经试生产统计，例1～3工艺制得电缆的电性能均可达标，且合格。
例1工艺制得电缆的优品率为98.7％，例2工艺制得电缆的优品率为99.5％，、例3工艺制得电缆的优品率为99.8％。
本方法制得电缆，检测结果如下表所示(检验依据为：ICEA S-94-649)：
1、绝缘机械性能：
原始抗张强度是14.4MPa(要求为≥8.2MPa)；
原始断裂伸长率为480％(要求为≥250％)；
经过121摄氏度，168小时老化后，
抗张强度保留率是92％(要求为≥80％)；
断裂伸长率保留率是94％(要求为≥80％)；
2、150摄氏度，15分钟热蠕变
负载下最大伸长率是10％(要求是≤50％)；
冷却后最大延伸是0(要求是≤5％)；
3、护套原始继续性能
抗张强度25.8MPa(要求为≥11.7MPa)；
断裂伸长率为860％(要求为≥300％)；
经过100摄氏度，48小时老化后，
抗张强度保留率是90％(要求为≥75％)；
断裂伸长率保留率是85％(要求为≥75％)；
4、导体屏蔽：
没有延伸至绝缘内超过0.124mm，至导体屏蔽内超过0.18mm的凸起；
绞合褶皱不超过0.18mm；
挤包导体屏蔽和绝缘之间的界面没有大于0.076mm的微孔。
5、绝缘屏蔽：
没有任何大于5mils的微孔；
没有延伸至绝缘内超过5mils，至挤包绝缘屏蔽内超过7mils的凸起和不规则。
6、绝缘屏蔽压痕是0.182mm(要求是≤0.381mm)；
7、25摄氏度导体直流电阻为0.164Ω/km(要求是≤0.171Ω/km)；
8、交流耐压试验(35kV/5min)：无击穿(要求是无击穿)；
9、局部放电试验(35kV)为2.5PC(要求是≤5PC)；
10、15.6摄氏度绝缘电阻为10200MΩ·km(要求是≥6080MΩ·km)。
负载循环14天后实验：
1、电气测量
结果：
局部放电试验(35kV)为1.8PC(要求是≤5PC)；
电容(15kV，室温)为322pF/m；
根据电容计算的介电常数：0.0414×332×lg(D/d)＝2.62(D是测量的绝缘外径，d是测量的导体屏蔽外径)(要求是≤4.0)；
介电损失(15kV，室温)：0.15(要求是≤1.5)
2、高压时间实验
实验方法：
50Hz、17.5kV交流电，室温下，持续5分钟，然后，每次递增7kV，每个电压值都持续5分钟，直至击穿。
结果：
交流击穿电压143.5kV，维持时间2分46秒；
交流耐压等级：136.5kV(要求是≥19.7kV)；
交流耐压值：31.0kV/mm。
3、热冲击试验
实验方法：
导体温度为125～130摄氏度；
10次110kV正脉冲，10次110kV负脉冲。然后电压以27.5kV步进升高，同时，每个电压值施加3次负脉冲，直至击穿。
结果：
10次110kV正脉冲，10次110kV负脉冲，无击穿；
击穿冲击电压为220kV；
击穿冲击电压等级是192.5kV；
最小冲击耐压值是43.75kV/mm(要求是≥31.5kV)。
负载循环14天后，再进行120天加速水树实验：
1、电气测量
结果：
局部放电试验(35kV)为2.1PC(要求是≤5PC)；
电容(15kV，室温)为322pF/m；
根据电容计算的介电常数：0.0414×332×lg(D/d)＝2.67(D是测量的绝缘外径，d是测量的导体屏蔽外径)(要求是≤4.0)；
介电损失(15kV，室温)：0.16(要求是≤1.5)
2、高压时间实验
实验方法：
50Hz、17.5kV交流电，室温下，持续5分钟，然后，每次递增7kV，每个电压值都持续5分钟，直至击穿。
结果：
交流击穿电压136.5kV，维持时间3分28秒；
交流耐压等级：129.5kV(要求是≥19.7kV)；
交流耐压值：29.4kV/mm。
负载循环14天后，再进行180天加速水树实验：
高压时间实验
实验方法：
50Hz、17.5kV交流电，室温下，持续5分钟，然后，每次递增7kV，每个电压值都持续5分钟，直至击穿。
结果：
交流击穿电压136.5kV，维持时间2分24秒；
交流耐压等级：129.5kV(要求是≥19.7kV)；
交流耐压值：29.4kV/mm。
负载循环14天后，再进行360天加速水树实验：
高压时间实验
实验方法：
50Hz、17.5kV交流电，室温下，持续5分钟，然后，每次递增7kV，每个电压值都持续5分钟，直至击穿。
结果：
交流击穿电压129.5kV，维持时间1分29秒；
交流耐压等级：122.5kV(要求是≥19.7kV)；
交流耐压值：27.8kV/mm。

Claims (8)

  1. 一种抗水树中压乙丙绝缘电缆的制造方法，其特征是
    所述电缆的结构为：围绕同一轴线，自内而外依次是导体、导体屏蔽层、绝缘层、绝缘屏蔽层和护套层；
    在护套层内嵌有多根中性导体，各根中型导体绕在绝缘屏蔽层外，且与绝缘屏蔽层的外壁密贴；相邻中性导体之间的间距相同，且间距大于0；
    构成所述导体屏蔽层的是交联聚乙烯半导电屏蔽料；构成所述绝缘层的是三元乙丙橡胶绝缘料；构成所述绝缘屏蔽层的是橡胶半导电屏蔽料；构成所述护套层的是聚乙烯护套料；
    所述导体的截面积不小于500mm 2；导体屏蔽层的厚度不小于0.61mm；绝缘层的厚度为5.33～6.35mm；绝缘屏蔽层的厚度为1.40～2.67mm；护套层的厚度为1.78～3.05mm；
    所述电缆的制造方法，其步骤包括：
    1)制造导体：
    把由铜单丝或铝单丝绞合压紧构成截面是圆形的导体；导体的截面积不小于500mm 2；
    2)制造导体屏蔽层：
    先把半导电尼龙带绕包在导体外，再在其外挤包交联聚乙烯半导电屏蔽料；
    半导电尼龙带标称厚度为0.1～0.15mm，搭盖率不小于50％；
    所述半导电尼龙带在使用前烘干，烘干温度为50～60℃，烘干时间不少于24h；冷却至常温后及时密封保存；经烘干处理的半导电尼龙带应在12h内使用完；
    对于生产过程中未使用完并且已开封的半导电尼龙带应及时进行密封保存；绕包半导电尼龙带导体应在半导电带绕包完成后72h内转入下道工序步骤进行生产；
    3)制造绝缘层：
    在导体屏蔽层外挤包三元乙丙橡胶绝缘料，构成绝缘层；
    4)制造绝缘屏蔽层：
    在绝缘层外挤包半导电绝缘屏蔽料构成绝缘屏蔽层；
    所述步骤2)～4)中，挤包交联聚乙烯半导电屏蔽料、三元乙丙橡胶绝缘料和半导电绝缘屏蔽料是采用三层共挤工艺由挤橡机制造；
    5)由步骤1)～4)制得线芯；在线芯的绝缘屏蔽层外疏绕裸铜丝；疏绕方向为右向，疏绕节径比为6～10；
    裸铜丝的数量为6～32根；裸铜丝的线径范围为：1.29～3.26mm；裸铜丝疏绕时候的张力范围为15～30N；
    再在裸铜丝外间隙绕包无纺布带，绕包方向为左向；
    无纺布带绕包时候的张力范围为：5～10N；无纺布带为非搭盖状态，无纺布带间隙范围为：5～10mm；
    最后采用光洁铁盘收线；
    6)把步骤5)得到线盘装在护套挤包生产线的放线机上，边放线边取下步骤5中的无纺布带；再由挤包生产线的挤塑机挤包护套料。
    所述步骤4)中，三层共挤的工艺要求为：
    自进料到出料方向，三层共挤机身温度控制如下：
    交联聚乙烯半导电屏蔽料挤出一区温度范围是76～83℃、二区温度范围是 88～92℃、三区温度范围是94～98℃；
    三元乙丙橡胶绝缘料挤出一区温度范围是66～72℃、二区温度范围是78～84℃、三区温度范围是87～91℃；
    半导电绝缘屏蔽料挤出一区温度范围是68～73℃、二区温度范围是76～81℃、三区温度范围是88～94℃、四区温度范围是96～100℃；
    其中：一区为入料段，二区和三区为塑化段，四区为均化段；
    自进料到出料方向，挤橡机的机头单元温区为：一区温度范围是94～98℃、二区温度范围是95～96℃、三区温度范围是89～92℃；
    其中：一区为机头段、二区为机颈段、三区为模口段；
    冷却是采用冷水冷却；
    所述步骤6)中，自进料到出料方向，挤塑机的机身各区温度分布为：一区温度范围是152～158℃、二区温度范围是160～166℃、三区温度范围是173～180℃、四区温度范围是182～188℃，其中：一区为入料段，二区和三区为塑化段，四区为均化段；
    挤塑机的机头单元温度为：机头为温度范围是182～188℃、机颈为温度范围是182～188℃、模口为温度范围是182～188℃；
    护套应采用分段冷却，第一段冷却水槽水温为60～70℃，其它段均采用常温水。
  2. 根据权利要求1所述的电缆的制造方法，其特征是所述护套层的外壁内嵌有色条。
  3. 根据权利要求1所述的电缆的制造方法，其特征是
    所述步骤4)中，自进料到出料方向，三层共挤机身温度控制如下：
    交联聚乙烯半导电屏蔽料挤出一区温度是76℃、二区温度是88℃、三区温度是98℃；
    三元乙丙橡胶绝缘料挤出一区温度是66℃、二区温度是84℃、三区温度是87℃；
    半导电绝缘屏蔽料挤出一区温度是73℃、二区温度是76℃、三区温度是88℃、四区温度是100℃；
    自进料到出料方向，挤橡机的机头单元温区为：一区温度是94℃、二区温度是95℃、三区温度是92℃；
    所述步骤6)中，自进料到出料方向，挤塑机的机身各区温度分布为：一区温度是152℃、二区温度是166℃、三区温度是180℃、四区温度是182℃；
    挤塑机的机头单元温度为：机头为温度是182℃、机颈为温度是182℃、模口为温度是182℃；
    护套应采用分段冷却，第一段冷却水槽水温为60℃，其它段均采用常温水。
  4. 根据权利要求1所述的电缆的制造方法，其特征是
    所述步骤4)中，自进料到出料方向，三层共挤机身温度控制如下：
    交联聚乙烯半导电屏蔽料挤出一区温度是83℃、二区温度是92℃、三区温度是94℃；
    三元乙丙橡胶绝缘料挤出一区温度是72℃、二区温度是78℃、三区温度是91℃；
    半导电绝缘屏蔽料挤出一区温度是68℃、二区温度是81℃、三区温度是94℃、四区温度是96℃；
    自进料到出料方向，挤橡机的机头单元温区为：一区温度是98℃、二区温 度是96℃、三区温度是89℃；
    所述步骤6)中，自进料到出料方向，挤塑机的机身各区温度分布为：一区温度是158℃、二区温度是160℃、三区温度是173℃、四区温度是188℃；
    挤塑机的机头单元温度为：机头为温度范围是188℃、机颈为温度范围是188℃、模口为温度范围是188℃；
    护套应采用分段冷却，第一段冷却水槽水温为70℃，其它段均采用常温水。
  5. 根据权利要求1所述的电缆的制造方法，其特征是
    所述步骤4)中，自进料到出料方向，三层共挤机身温度控制如下：
    交联聚乙烯半导电屏蔽料挤出一区温度是80℃、二区温度是90℃、三区温度是95℃；
    三元乙丙橡胶绝缘料挤出一区温度是70℃、二区温度是80℃、三区温度是90℃；
    半导电绝缘屏蔽料挤出一区温度是70℃、二区温度是80℃、三区温度是90℃、四区温度是100℃；
    自进料到出料方向，挤橡机的机头单元温区为：一区温度是95℃、二区温度是95℃、三区温度是90℃；其中，一区为机头段、二区为机颈段、三区为模口段；
    冷却是采用冷水冷却；
    所述步骤6)中，自进料到出料方向，挤塑机的机身各区温度分布为：一区温度是155℃、二区温度是165℃、三区温度是175℃、四区温度是185℃，其中：一区为入料段，二区和三区为塑化段，四区为均化段；
    挤塑机的机头单元温度为：机头为温度是185℃、机颈为温度是185℃、模口为温度是185℃；
    护套应采用分段冷却，第一段冷却水槽水温为68℃，其它段均采用常温水。
  6. 一种如权利要求1～5任一方法制得的电缆，其特征是所述电缆的结构为：围绕同一轴线，自内而外依次是导体、导体屏蔽层、绝缘层、绝缘屏蔽层和护套层；
    在护套层内嵌有多根中性导体，各根中型导体绕在绝缘屏蔽层外，且与绝缘屏蔽层的外壁密贴；相邻中性导体之间的间距相同，且间距大于0；
    构成所述导体屏蔽层的是交联聚乙烯半导电屏蔽料；构成所述绝缘层的是三元乙丙橡胶绝缘料；构成所述绝缘屏蔽层的是橡胶半导电屏蔽料；构成所述护套层的是聚乙烯护套料；
    所述导体的截面积不小于500mm 2；导体屏蔽层的厚度不小于0.61mm；绝缘层的厚度为5.33～6.35mm；绝缘屏蔽层的厚度为1.40～2.67mm；护套层的厚度为1.78～3.05m。
  7. 根据权利要求7所述的电缆的制造方法，其特征是成所述导体屏蔽层和导体外之间绕包有半导电尼龙带；半导电尼龙带标称厚度为0.1～0.15mm，搭盖率不小于50％。
  8. 根据权利要求7所述的电缆的制造方法，其特征是所述半导电尼龙带标称厚度为0.12mm，搭盖率为65％。
PCT/CN2018/117531 2017-12-15 2018-11-26 一种抗水树中压乙丙绝缘电缆的制造方法及电缆 WO2019114533A1 (zh)

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