CN109378136B - Manufacturing method of environment-friendly medium-voltage power cable and cable - Google Patents

Manufacturing method of environment-friendly medium-voltage power cable and cable Download PDF

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Publication number
CN109378136B
CN109378136B CN201811387151.1A CN201811387151A CN109378136B CN 109378136 B CN109378136 B CN 109378136B CN 201811387151 A CN201811387151 A CN 201811387151A CN 109378136 B CN109378136 B CN 109378136B
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layer
semi
wrapping
conductive
insulating
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CN109378136A (en
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凌国桢
刘雄军
陈林
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Jiangsu Shangshang Cable Group Co Ltd
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Jiangsu Shangshang Cable Group Co Ltd
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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
    • 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
    • H01B13/0016—Apparatus or processes specially adapted for manufacturing conductors or cables for heat 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
    • H01B13/06—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
    • H01B13/221—Sheathing; Armouring; Screening; Applying other protective layers filling-up interstices
    • 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
    • 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
    • H01B7/292—Protection against damage caused by extremes of temperature or by flame using material resistant to heat
    • 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)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Insulated Conductors (AREA)

Abstract

A manufacturing approach and cable of the medium voltage power cable of environmental protection, the step includes 1) manufacturing the sinle silk; 2) Manufacturing a cable core; 3) Manufacturing a protective layer; step 1) comprises: 1.1 Wrapping a semiconductive shield around the conductor: the semi-conductive conductor shielding layer is formed by wrapping an environment-friendly polypropylene semi-conductive layer by extrusion, or wrapping a semi-conductive belt outside a conductor and wrapping the environment-friendly polypropylene semi-conductive layer outside the semi-conductive belt; 1.2 Wrapping the insulating layer: the insulating layer is formed by extruding and packing environment-friendly polypropylene elastomer insulating materials; 1.3 Wrapping the semi-conductive insulating shielding layer: the semi-conductive insulating shielding layer is formed by extruding and wrapping strippable or non-strippable environment-friendly polypropylene semi-conductive material to form a semi-conductive material extrusion layer, and the semi-conductive material extrusion layer is externally wrapped with a semi-conductive tape; the environment-friendly polypropylene semi-conductive layer, the insulating layer and the semi-conductive material extrusion coating of the semi-conductive insulating shielding layer of the semi-conductive shielding layer are formed by three layers of co-extrusion.

Description

Manufacturing method of environment-friendly medium-voltage power cable and cable
Technical Field
The invention relates to the technical field of cables, in particular to a manufacturing method of an environment-friendly medium-voltage power cable and the cable.
Background
The traditional XLPE insulated cable has been used for many years, a special vulcanization pipeline is needed for crosslinking in the processing process, the equipment cost is high, and the installation cost is high; the production process is complex, the insulating material is easy to generate pre-crosslinked particles, and the crosslinking degree is difficult to control; the long-term use of the water tree branch and the electric tree branch is easy to generate in a wet environment, and the service life is generally 15-20 years.
Along with the trend of people for good life, the requirements of the nation on environmental protection are higher and higher, the problem of material pollution caused by replacement of cables after the service life or in the process is considered, and the XLPE decomposition speed is low, so that the industrial recycling and reprocessing cannot be basically achieved. Although the current TR-XLPE insulated cables are more and more, the waterproof tree performance of the cables is enhanced, the service life of the cables is prolonged, and the problems of material recycling and reprocessing cannot be solved.
Disclosure of Invention
The invention aims to provide a manufacturing method of an environment-friendly medium-voltage power cable, which adopts an environment-friendly polypropylene semi-conductive material to realize the recycling convenience of the material. Meanwhile, the cable is required to meet the existing functional and performance requirements and production requirements of the cable.
In order to achieve the above object, a method for manufacturing an environment-friendly medium voltage power cable comprises the following steps: 1) Manufacturing a wire core; 2) Manufacturing a cable core; 3) Manufacturing a protective layer;
the step 1) comprises the following steps:
1.1 Wrapping a semiconductive shield around the conductor:
the semi-conductive shielding layer is an environment-friendly polypropylene semi-conductive layer which is extruded,
or the semi-conductive shielding layer is formed by wrapping a semi-conductive band outside a conductor and wrapping an environment-friendly polypropylene semi-conductive layer outside the semi-conductive band;
1.2 Wrapping the insulating layer: the insulating layer is formed by extruding and packing environment-friendly polypropylene elastomer insulating materials;
1.3 Wrapping the semi-conductive insulating shielding layer:
the semi-conductive insulating shielding layer is formed by extruding and wrapping strippable or non-strippable environment-friendly polypropylene semi-conductive material to form a semi-conductive material extrusion layer, and the semi-conductive material extrusion layer is externally wrapped with a semi-conductive tape;
in the steps 1.1) to 1.3), the environment-friendly polypropylene semi-conductive material of the semi-conductive semiconductor shielding layer, the environment-friendly polypropylene elastomer insulating material of the insulating layer and the environment-friendly polypropylene semi-conductive material of the semi-conductive insulating shielding layer are three-layer coextrusion methods; the technological requirements of three-layer coextrusion are as follows:
from the feeding to the discharging direction, the temperature of the three-layer co-extrusion machine body is controlled as follows:
the temperature of the first region to the fourth region of the first extruder for manufacturing the environment-friendly polypropylene semiconductor conductive material of the semiconductor shielding layer is as follows: 95-105 ℃, 135-145 ℃, 185-195 ℃ and 185-195 ℃;
the temperature of the first region to the sixth region of the second extruder for manufacturing the environment-friendly polypropylene elastomer insulating material of the insulating layer is sequentially as follows: 75-85 ℃, 125-135 ℃, 170-180 ℃, 185-195 ℃, 190-200 ℃ and 190-200 ℃;
the temperature of the first region to the fifth region of the third extruder for manufacturing the environment-friendly polypropylene semiconductive material of the semiconductive insulating shielding layer is as follows: 95-105 ℃, 135-145 ℃, 185-195 ℃ and 185-195 ℃;
each extruder: the first area is a feeding section, the second area and the third area are plasticizing sections, and the fourth area and the later are homogenizing sections;
the first extruder uses a 20 mesh, 80 mesh and 20 mesh discharging filter screen;
the second extruder uses a discharge filter screen with 80 meshes, 200 meshes, 80 meshes and 20 meshes;
the third extruder uses a 20 mesh, 80 mesh and 20 mesh discharging filter screen;
the temperature of the neck section of the first extruder is 185-195 ℃;
the temperature of the neck section of the second extruder is 190-200 ℃;
the temperature of the neck section of the third extruder is 185-195 ℃;
the first extruder, the second extruder and the third extruder use three-layer coextrusion heads, the heads are heated by an oil hot die temperature meter, and the temperature is 220-230 ℃;
directly cooling the three layers by cold water after extrusion;
1.4 A metal shielding layer is wrapped again:
the metal shielding layer is a copper strip shielding layer which is formed by one or more layers of soft copper strips overlapped and wrapped; the average covering rate of the copper strip is not less than 15%, the minimum covering rate of the copper strip is not less than 5%, and the nominal thickness of the copper strip is not less than 0.12mm;
alternatively, the metal shielding layer is a copper wire shielding layer; the outer surface of the copper wire shielding layer is tightly tied by a copper wire or a copper strip which is reversely wrapped; the average clearance between adjacent copper wires of the copper wire shielding layer is not more than 4mm;
the step 3) comprises the following steps:
3.1 Wrapping the first wrapping tape layer outside the cable core;
3.2 A first wrapping band layer is wrapped outside the inner sheath layer.
Further, the conductor is a copper or aluminum second-class stranded compressed conductor, and the direct current resistance and the number of monofilaments of the conductor meet the requirements of GB/T3956; or the conductor is a longitudinal water blocking conductor.
Further, in the step 3.1), the wrapping band of the first wrapping band is a non-woven wrapping band or a reinforced non-woven wrapping band having a nominal thickness of at least 0.2 mm;
in the step 3.2), the nominal thickness of the inner sheath layer is not less than 1.2mm; the sheath material forming the inner sheath layer is one of polyvinyl chloride, polyethylene or low smoke halogen-free material.
One situation is: and (3) skipping the step (2) and directly carrying out the step (3) if 1 wire core is manufactured in the step (1), namely the single wire core forms the cable core).
Another situation is: the number of the wire cores prepared in the step 1) is multiple, and then:
step 2) comprises: twisting each wire core into a cable according to the pitch diameter ratio of 20-35 times; filling materials are filled between the first wrapping layer and each wire core;
step 3) further comprises:
3.3 A metal armor layer is wrapped outside the inner sheath layer;
the metal armor layer is a metal tape armor, the metal tape is a galvanized steel tape or a stainless steel tape, the nominal thickness of the metal tape is 0.5mm or 0.8mm, the wrapping gap is not more than 50% of the width of the tape, and the gap of the inner layer steel tape is covered by the part of the outer layer steel tape close to the middle;
or the metal armor layer is a metal wire armor, the metal wire is a galvanized steel wire or a stainless steel wire, the nominal diameter of the metal wire is 1.25mm, 1.6mm, 2.0mm, 2.5mm or 3.15mm, the total armor gap is not more than the diameter of one steel wire, and the pitch diameter ratio is 12-16 times;
3.4 Wrapping a second wrapping band layer outside the metal armor layer;
the wrapping tape of the second wrapping tape layer is a non-woven fabric wrapping tape or a reinforced non-woven fabric wrapping tape with the nominal thickness of at least 0.2 mm; the lapping coverage rate of the second lapping tape layer is not less than 15%, and the minimum lapping width is not less than 5mm;
3.5 Wrapping an outer sheath layer outside the second wrapping belt layer;
the sheath material forming the outer sheath layer is one of polyvinyl chloride, polyethylene or low smoke halogen-free flame retardant material; the nominal thickness of the outer jacket layer is not less than 1.8mm.
The filling is a non-hygroscopic polypropylene filling rope.
The single-wire core cable produced by the production method of the first case comprises: cable core, first around band layer and inner sheath layer, wherein:
the conductor and the semiconductive conductor shielding layer, the insulating layer and the semiconductive insulating shielding layer which are sequentially wrapped from inside to outside form an insulating wire core; the outer part of the insulated wire core is sequentially wrapped with a metal shielding layer from inside to outside to form a cable core; the cable core is from inside to outside wrapped up first around band layer and inner sheath layer in proper order outward, wherein:
the semi-conductive semiconductor shielding layer is formed by wrapping an environment-friendly polypropylene semi-conductive layer by extrusion, or wrapping a semi-conductive belt outside a conductor, and wrapping the environment-friendly polypropylene semi-conductive layer outside the semi-conductive belt;
the semiconductor shielding layer is tightly combined with the insulating layer, the contact interface between the semiconductor shielding layer and the insulating layer is smooth, and the thickness of the thinnest point of the semiconductor shielding layer is not less than 0.5mm;
the insulating layer is an insulating layer formed by extruded environment-friendly polypropylene elastomer insulating materials; the nominal thickness of the insulating layer is not less than the corresponding nominal thickness of the crosslinked polyethylene XLPE insulation in GB/T12706, and the thickness of the thinnest point of the insulating layer is not less than 90-0.1 mm of the nominal thickness value of the insulating layer;
the semiconductive insulating shield layer includes: extruding and wrapping strippable or non-strippable environment-friendly polypropylene semi-conductive material to form a semi-conductive material extrusion coating, and wrapping a semi-conductive tape outside the semi-conductive material extrusion coating;
the semiconducting insulating shielding layer is tightly combined with or can be peeled off from the insulating layer, the contact interface between the semiconducting insulating shielding layer and the insulating layer is smooth, and the thickness of the thinnest point of the semiconducting insulating shielding layer is not less than 0.5mm;
the sheath material forming the inner sheath layer is one of polyvinyl chloride, polyethylene or low smoke halogen-free material;
the metal shielding layer is a copper strip shielding layer or a copper wire shielding layer;
the outer surface of the copper wire shielding layer is tightly tied by the reversely wrapped copper wires or copper strips, and the average gap between adjacent copper wires of the copper wire shielding layer is not more than 4mm;
the copper strip shielding layer is formed by one or more layers of soft copper strips which are overlapped and wrapped; the average covering rate of the copper strip is not less than 15%, the minimum covering rate of the copper strip is not less than 5%, and the nominal thickness of the copper strip is not less than 0.12mm;
the wrapping tape of the first wrapping tape layer is a non-woven fabric wrapping tape or a reinforced non-woven fabric wrapping tape with the nominal thickness of at least 0.2 mm;
the nominal thickness of the inner sheath layer is not less than 1.2mm.
The multi-wire cable manufactured by the manufacturing method in the second case comprises a cable core formed by a plurality of mutually twisted wire cores; the cable core is sequentially wrapped with a first wrapping band layer, an inner sheath layer, a metal armor layer, a second wrapping band layer and an outer sheath layer from inside to outside;
the structure for any wire core is as follows: the conductor is sequentially wrapped with a semiconductive shielding layer, an insulating layer, a semiconductive insulating shielding layer and a metal shielding layer from inside to outside,
the semi-conductive shielding layer is formed by wrapping an environment-friendly polypropylene semi-conductive layer by extrusion, or wrapping a semi-conductive belt outside a conductor and wrapping the environment-friendly polypropylene semi-conductive layer outside the semi-conductive belt; the semiconductor shielding layer is tightly combined with the insulating layer, the contact interface between the semiconductor shielding layer and the insulating layer is smooth, and the thickness of the thinnest point of the semiconductor shielding layer is not less than 0.5mm;
the insulating layer is formed by extruding and packing environment-friendly polypropylene elastomer insulating materials; the nominal thickness of the insulating layer is not less than the corresponding nominal thickness of the crosslinked polyethylene XLPE insulation in GB/T12706, and the thickness of the thinnest point of the insulating layer is not less than 90-0.1 mm of the nominal thickness value of the insulating layer;
the semi-conductive insulating shielding layer is formed by wrapping an environment-friendly polypropylene semi-conductive material which can be stripped or not stripped to form a semi-conductive material extrusion layer, and the semi-conductive material extrusion layer is wrapped with a semi-conductive tape; the semi-conductive insulating shielding layer is tightly combined with the insulating layer or can be peeled off, the contact interface between the semi-conductive insulating shielding layer and the insulating layer is smooth, and the thickness of the thinnest point of the semi-conductive insulating shielding layer is not less than 0.5mm;
and a non-hygroscopic polypropylene filling rope is filled between the first wrapping layer and each wire core.
Compared with the prior art, the invention has the following advantages:
1. in the invention, the environment-friendly high-performance polypropylene elastomer material is used as insulation, the voltage resistance level is high, the long-term working temperature can reach 105 ℃, the current-carrying capacity of the cable can be greatly improved, and the system loss is reduced; in addition, the environment-friendly high-performance polypropylene elastomer material has simple production process, no need of crosslinking, no pre-crosslinked particles in shutdown reproduction, greatly reduced production process requirements and energy requirements, and low processing cost; the polypropylene resin has rich output and low cost compared with polyethylene resin. Meanwhile, the high-performance polypropylene elastomer material is a thermoplastic material, can be recycled, degraded and reused, and has the characteristic of environmental protection.
2. In the invention, the conductor shielding, insulation and insulation shielding of the cable are produced by three layers of coextrusion. The three-layer co-extrusion production ensures the cleanliness of cable insulation, reduces impurities and air holes in insulation, and ensures the effectiveness of long-term operation of cable insulation.
Drawings
Fig. 1 is a schematic radial cross-section of a multi-wire core cable in an embodiment;
fig. 2 is a schematic radial cross-section of a wire core in an embodiment.
FIG. 3 is a schematic radial cross-section of a single-wire core cable in an embodiment;
in the figure: conductor 1, semiconductive shield 2, insulation 3, semiconductive insulation shield 4, metallic shield 5, fill 6, first wrap tape layer 7, inner jacket layer 8, metallic armor layer 9, second wrap tape layer 10, outer jacket layer 11.
Detailed Description
For a better understanding of the technical content of the present invention, specific examples are set forth below, along with the accompanying drawings.
The manufacturing method of the environment-friendly medium-voltage power cable comprises the following steps: 1) Manufacturing a wire core; 2) Manufacturing a cable core; 3) The manufacturing of the protective layer is characterized in that
The step 1) comprises the following steps:
1.1 Wrapping a semiconductive shield around the conductor:
the semi-conductive shielding layer is an environment-friendly polypropylene semi-conductive layer which is extruded,
or the semi-conductive shielding layer is formed by wrapping a semi-conductive band outside a conductor and wrapping an environment-friendly polypropylene semi-conductive layer outside the semi-conductive band;
1.2 Wrapping the insulating layer: the insulating layer is formed by extruding and packing environment-friendly polypropylene elastomer insulating materials;
1.3 Wrapping the semi-conductive insulating shielding layer:
the semi-conductive insulating shielding layer is formed by extruding and wrapping strippable or non-strippable environment-friendly polypropylene semi-conductive material to form a semi-conductive material extrusion layer, and the semi-conductive material extrusion layer is externally wrapped with a semi-conductive tape;
in the steps 1.1) to 1.3), the environment-friendly polypropylene semi-conductive material of the semi-conductive semiconductor shielding layer, the environment-friendly polypropylene elastomer insulating material of the insulating layer and the environment-friendly polypropylene semi-conductive material of the semi-conductive insulating shielding layer are three-layer coextrusion methods; the technological requirements of three-layer coextrusion are as follows:
from the feeding to the discharging direction, the temperature of the three-layer co-extrusion machine body is controlled as follows:
the temperature of the first region to the fourth region of the first extruder for manufacturing the environment-friendly polypropylene semiconductor conductive material of the semiconductor shielding layer is as follows: 95-105 ℃, 135-145 ℃, 185-195 ℃ and 185-195 ℃;
the temperature of the first region to the sixth region of the second extruder for manufacturing the environment-friendly polypropylene elastomer insulating material of the insulating layer is sequentially as follows: 75-85 ℃, 125-135 ℃, 170-180 ℃, 185-195 ℃, 190-200 ℃ and 190-200 ℃;
the temperature of the first region to the fifth region of the third extruder for manufacturing the environment-friendly polypropylene semiconductive material of the semiconductive insulating shielding layer is as follows: 95-105 ℃, 135-145 ℃, 185-195 ℃ and 185-195 ℃;
each extruder: the first area is a feeding section, the second area and the third area are plasticizing sections, and the fourth area and the later are homogenizing sections;
the first extruder uses a 20 mesh, 80 mesh and 20 mesh discharging filter screen;
the second extruder uses a discharge filter screen with 80 meshes, 200 meshes, 80 meshes and 20 meshes;
the third extruder uses a 20 mesh, 80 mesh and 20 mesh discharging filter screen;
the temperature of the neck section of the first extruder is 185-195 ℃;
the temperature of the neck section of the second extruder is 190-200 ℃;
the temperature of the neck section of the third extruder is 185-195 ℃;
the first extruder, the second extruder and the third extruder use three-layer coextrusion heads, the heads are heated by an oil hot die temperature meter, and the temperature is 220-230 ℃;
directly cooling the three layers by cold water after extrusion;
in the example, the environment-friendly polypropylene elastomer insulating material for manufacturing the insulating layer consists of more than 80% by mass of PP, more than 10% by mass of thermoplastic elastomer TPE and the balance of antioxidant. The environment-friendly polypropylene semi-conductive material consists of carbon black, PP, PE and an antioxidant. The optimal technological scheme of this example is:
from the feeding to the discharging direction, the temperature of the three-layer co-extrusion machine body is controlled as follows:
the temperatures of the first region and the fourth region of the first extruder are as follows: 100 ℃/140 ℃/190 ℃/190 ℃; the temperatures of the first region and the sixth region of the second extruder are as follows: 80 ℃/130 ℃/175 ℃/190 ℃/195 ℃/195 ℃; the temperatures of the first region and the fifth region of the third extruder are as follows: 100 ℃/140 ℃/190 ℃/190 ℃/190 ℃;
the first extruder used a 20 mesh +80 mesh +20 mesh screen; the second extruder uses a 80 mesh+200 mesh+80 mesh+20 mesh screen; the third extruder uses a 20 mesh +80 mesh +20 mesh screen;
the temperature of the neck section of the first extruder is 190 ℃; the temperature of the neck section of the second extruder is 195 ℃; the temperature of the neck section of the third extruder is 190 ℃;
the head of the three-layer co-extrusion head is heated by an oil hot die temperature meter, and the temperature is 225 ℃.
Directly cooling by cold water after extrusion;
1.4 A metal shielding layer is wrapped again:
the metal shielding layer is a copper strip shielding layer which is formed by one or more layers of soft copper strips overlapped and wrapped; the average covering rate of the copper strip is not less than 15%, the minimum covering rate of the copper strip is not less than 5%, and the nominal thickness of the copper strip is not less than 0.12mm;
alternatively, the metal shielding layer is a copper wire shielding layer; the outer surface of the copper wire shielding layer is tightly tied by a copper wire or a copper strip which is reversely wrapped; the average clearance between adjacent copper wires of the copper wire shielding layer is not more than 4mm;
the step 3) comprises the following steps:
3.1 Wrapping the first wrapping tape layer outside the cable core;
3.2 A first wrapping band layer is wrapped outside the inner sheath layer.
Further, the conductor is a copper or aluminum second-class stranded compressed conductor, and the direct current resistance and the number of monofilaments of the conductor meet the requirements of GB/T3956; or the conductor is a longitudinal water blocking conductor.
Further, in the step 3.1), the wrapping band of the first wrapping band is a non-woven wrapping band or a reinforced non-woven wrapping band having a nominal thickness of at least 0.2 mm;
in the step 3.2), the nominal thickness of the inner sheath layer is not less than 1.2mm; the sheath material forming the inner sheath layer is one of polyvinyl chloride, polyethylene or low smoke halogen-free material.
One situation is: and (3) skipping the step (2) and directly carrying out the step (3) if 1 wire core is manufactured in the step (1), namely the single wire core forms the cable core).
Another situation is: the number of the wire cores prepared in the step 1) is multiple, and then:
step 2) comprises: twisting each wire core into a cable according to the pitch diameter ratio of 20-35 times; filling materials are filled between the first wrapping layer and each wire core;
step 3) further comprises:
3.3 A metal armor layer is wrapped outside the inner sheath layer;
the metal armor layer is a metal tape armor, the metal tape is a galvanized steel tape or a stainless steel tape, the nominal thickness of the metal tape is 0.5mm or 0.8mm, the wrapping gap is not more than 50% of the width of the tape, and the gap of the inner layer steel tape is covered by the part of the outer layer steel tape close to the middle;
or the metal armor layer is a metal wire armor, the metal wire is a galvanized steel wire or a stainless steel wire, the nominal diameter of the metal wire is 1.25mm, 1.6mm, 2.0mm, 2.5mm or 3.15mm, the total armor gap is not more than the diameter of one steel wire, and the pitch diameter ratio is 12-16 times;
3.4 Wrapping a second wrapping band layer outside the metal armor layer;
the wrapping tape of the second wrapping tape layer is a non-woven fabric wrapping tape or a reinforced non-woven fabric wrapping tape with the nominal thickness of at least 0.2 mm; the lapping coverage rate of the second lapping tape layer is not less than 15%, and the minimum lapping width is not less than 5mm;
3.5 Wrapping an outer sheath layer outside the second wrapping belt layer;
the sheath material forming the outer sheath layer is one of polyvinyl chloride, polyethylene or low smoke halogen-free flame retardant material; the nominal thickness of the outer jacket layer is not less than 1.8mm.
The filling is a non-hygroscopic polypropylene filling rope.
The multi-wire cable of fig. 1 comprises a cable core formed by three mutually twisted wire cores; the cable core is sequentially wrapped with a first wrapping band layer, an inner sheath layer, a metal armor layer, a second wrapping band layer and an outer sheath layer from inside to outside;
as shown in fig. 2, for any wire core, the structure is: the conductor is sequentially wrapped with a semiconductive shielding layer, an insulating layer, a semiconductive insulating shielding layer and a metal shielding layer from inside to outside,
the semi-conductive shielding layer is formed by wrapping an environment-friendly polypropylene semi-conductive layer by extrusion, or wrapping a semi-conductive belt outside a conductor and wrapping the environment-friendly polypropylene semi-conductive layer outside the semi-conductive belt; the semiconductor shielding layer is tightly combined with the insulating layer, the contact interface between the semiconductor shielding layer and the insulating layer is smooth, and the thickness of the thinnest point of the semiconductor shielding layer is not less than 0.5mm;
the insulating layer is formed by extruding and packing environment-friendly polypropylene elastomer insulating materials; the nominal thickness of the insulating layer is not less than the corresponding nominal thickness of the crosslinked polyethylene XLPE insulation in GB/T12706, and the thickness of the thinnest point of the insulating layer is not less than 90-0.1 mm of the nominal thickness value of the insulating layer;
the semi-conductive insulating shielding layer is formed by wrapping an environment-friendly polypropylene semi-conductive material which can be stripped or not stripped to form a semi-conductive material extrusion layer, and the semi-conductive material extrusion layer is wrapped with a semi-conductive tape; the semi-conductive insulating shielding layer is tightly combined with the insulating layer or can be peeled off, the contact interface between the semi-conductive insulating shielding layer and the insulating layer is smooth, and the thickness of the thinnest point of the semi-conductive insulating shielding layer is not less than 0.5mm;
and filling is filled between the first wrapping layer and each wire core.
The metal shielding layer is a copper strip shielding layer or a copper wire shielding layer;
the outer surface of the copper wire shielding layer is tightly tied by the reversely wrapped copper wires or copper strips, and the average gap between adjacent copper wires of the copper wire shielding layer is not more than 4mm;
the copper strip shielding layer is formed by one or more layers of soft copper strips which are overlapped and wrapped; the average covering rate of the copper strip is not less than 15%, the minimum covering rate of the copper strip is not less than 5%, and the nominal thickness of the copper strip is not less than 0.12mm.
The pitch diameter ratio of the cable core twisted into the cable is 20-35 times.
The filling is a non-hygroscopic polypropylene filling rope.
The wrapping tape of the first wrapping tape layer is a non-woven fabric wrapping tape or a reinforced non-woven fabric wrapping tape with the nominal thickness of at least 0.2 mm;
the nominal thickness of the inner sheath layer is not less than 1.2mm (preferably not less than 1.4 mm); the sheath material forming the inner sheath layer is one of polyvinyl chloride, polyethylene or low smoke halogen-free material.
The wrapping tape of the second wrapping tape layer is a non-woven fabric wrapping tape or a reinforced non-woven fabric wrapping tape with the nominal thickness of at least 0.2 mm; the lapping coverage rate of the second lapping tape layer is not less than 15%, and the minimum lapping width is not less than 5mm.
The metal armor layer is wire armor or metal tape armor; the metal belt is a galvanized steel belt or a stainless steel belt, the nominal thickness of the metal belt is 0.5mm or 0.8mm, the wrapping gap is not more than 50% of the width of the belt, and the gap of the inner layer steel belt is covered by the part of the outer layer steel belt close to the middle;
the metal wire is galvanized steel wire or stainless steel wire, the nominal diameter of the metal wire is 1.25mm, 1.6mm, 2.0mm, 2.5mm or 3.15mm, the total armor clearance is not more than the diameter of one steel wire, and the pitch diameter ratio is 12-16 times.
The sheath material forming the outer sheath layer is one of polyvinyl chloride, polyethylene or low smoke halogen-free flame retardant material; the nominal thickness of the outer jacket layer is not less than 1.8mm.
The environment-friendly polypropylene semi-conductive layer, the insulating layer and the semi-conductive material extrusion coating of the semi-conductive insulating shielding layer of the semi-conductive shielding layer are formed by three layers of co-extrusion.
The conductor is a copper or aluminum second-class stranded compressed conductor, and the direct current resistance and the number of monofilaments of the conductor meet the requirements of GB/T3956; or the conductor is a longitudinal water blocking conductor.
The single-wire core cable of fig. 3, comprising: cable core, first around band layer and inner sheath layer, wherein:
the conductor and the semiconductive conductor shielding layer, the insulating layer and the semiconductive insulating shielding layer which are sequentially wrapped from inside to outside form an insulating wire core; the outer part of the insulated wire core is sequentially wrapped with a metal shielding layer from inside to outside to form a cable core; the cable core is from inside to outside wrapped up first around band layer and inner sheath layer in proper order outward, wherein:
the semi-conductive semiconductor shielding layer is formed by wrapping an environment-friendly polypropylene semi-conductive layer by extrusion, or wrapping a semi-conductive belt outside a conductor, and wrapping the environment-friendly polypropylene semi-conductive layer outside the semi-conductive belt;
the semiconductor shielding layer is tightly combined with the insulating layer, the contact interface between the semiconductor shielding layer and the insulating layer is smooth, and the thickness of the thinnest point of the semiconductor shielding layer is not less than 0.5mm;
the insulating layer is an insulating layer formed by extruded environment-friendly polypropylene elastomer insulating materials; the nominal thickness of the insulating layer is not less than the corresponding nominal thickness of the crosslinked polyethylene XLPE insulation in GB/T12706, and the thickness of the thinnest point of the insulating layer is not less than 90-0.1 mm of the nominal thickness value of the insulating layer;
the semiconductive insulating shield layer includes: extruding and wrapping strippable or non-strippable environment-friendly polypropylene semi-conductive material to form a semi-conductive material extrusion coating, and wrapping a semi-conductive tape outside the semi-conductive material extrusion coating;
the semiconducting insulating shielding layer is tightly combined with or can be peeled off from the insulating layer, the contact interface between the semiconducting insulating shielding layer and the insulating layer is smooth, and the thickness of the thinnest point of the semiconducting insulating shielding layer is not less than 0.5mm;
the sheath material forming the inner sheath layer is one of polyvinyl chloride, polyethylene or low smoke halogen-free material;
the metal shielding layer is a copper strip shielding layer or a copper wire shielding layer;
the outer surface of the copper wire shielding layer is tightly tied by the reversely wrapped copper wires or copper strips, and the average gap between adjacent copper wires of the copper wire shielding layer is not more than 4mm;
the copper strip shielding layer is formed by one or more layers of soft copper strips which are overlapped and wrapped; the average covering rate of the copper strip is not less than 15%, the minimum covering rate of the copper strip is not less than 5%, and the nominal thickness of the copper strip is not less than 0.12mm;
the wrapping tape of the first wrapping tape layer is a non-woven fabric wrapping tape or a reinforced non-woven fabric wrapping tape with the nominal thickness of at least 0.2 mm;
the nominal thickness of the inner jacket layer is not less than 1.2mm (preferably not less than 1.4 mm).
The semiconductive conductor shielding layer and the semiconductive insulating shielding layer can be formed by extruding and packing environment-friendly polypropylene semiconductive materials, the insulating layer is formed by environment-friendly high-performance polypropylene elastomer materials, and the semiconductive conductor shielding layer and the semiconductive insulating shielding layer are thermoplastic materials which can be degraded harmlessly and recycled; the cross-linking is not needed, the direct water cooling is carried out, and the production process requirement and the energy requirement are greatly reduced; no cross-linking by-product and no degassing treatment is needed; the voltage-resistant level is high, the long-term working temperature can reach 105 ℃, the current-carrying capacity of the cable can be greatly improved, and the system loss is reduced.
Table 1 shows the nominal thickness of XLPE insulation in GB/T12706.
Table 1 insulation nominal thickness table
Through detection, the performance parameters of the cable disclosed by the invention are as follows:
1. conductor operating temperature: the maximum temperature of the conductor in long-term operation is not more than 105 ℃, and the maximum temperature in short circuit (lasting for 5 s) is not more than 250 ℃.
2. Routine ac voltage test: the single-phase test voltage and duration of the standard rated voltage are shown in table 2.
TABLE 2 routine test voltages and durations
3. Partial discharge test: there is no measurable discharge exceeding the declaration sensitivity (5 pC or better).
4. Bending test and subsequent partial discharge test:
the diameter of the bending test cylinder should be:
bending three times; subsequent partial discharge tests did not have any measurable discharge exceeding the declared sensitivity (5 pC or better). (D-diameter of bent core, D-diameter of Cable)
5. Measurement of tan delta at room temperature: at an alternating voltage U0, the tan delta measurement should be not higher than 20×10 -4 。
6. Heating cycle test: the heating cycle should last for at least 8 hours, each heating process exceeding the maximum operating temperature of the conductor (5-10) deg.c for at least 2 hours, followed by natural cooling in air for at least 3 hours, so that the conductor temperature does not exceed the ambient temperature by 10 deg.c. The cycle was repeated 20 times. After the 20 th cycle, a partial discharge test was performed without any measurable discharge exceeding the declaration sensitivity (5 pC or better).
Upon thermal cycling, the test specimen should be subjected to at least one measurement of tan delta above the conductor's maximum operating temperature (5-10) C as specified in GB/T3048.11-2007. At AC voltage U 0 The tan delta measurement should be no higher than 40X 10 -4 。
After the 20 th cycle is completed, tan delta at room temperature should be measured as specified in GB/T3048.11-2007. AC voltage U 0 The tan delta measurement should be no higher than 20X 10 -4 。
7. Impulse voltage test and subsequent power frequency voltage test: the temperature of the conductor exceeds the highest running temperature (5-10) DEG C of the conductor, impact voltage meeting the requirements of GB/T12706 is applied, the positive polarity impact voltage is applied for 10 times, and the cable is not broken down; after the surge voltage test, a routine ac voltage test was performed, and insulation was not broken down.
8. 24h voltage test: the peak test voltages are shown in Table 3. The voltage should gradually rise to a prescribed value and the insulation should not break down.
TABLE 3 24h Voltage test Voltage
Rated voltage U 0 /kV 6 8.7 12 18 21 26
Test Voltage/kV 30 40 50 63 73.5 91
9. The shielding volume resistivity of the environment-friendly polypropylene semi-conductive conductor is not more than 1000 omega-m before aging and after aging at 100 ℃ for 14 d; the volume resistivity of the environment-friendly polypropylene semi-conductive insulating shield should not exceed 500 Ω·m.
10. Long-term stability test: a finished cable sample of at least 50m should be laid down buried or placed directly on the floor of the laboratory. The cable ends need to be sealed and other fittings may also be included in the load cycle test. Throughout the duty cycle test, a cable sample that should contain at least 3m was in a tank containing tap water. The volume of water in the tank must not exceed 10 times the volume of the cable in the tank. If the outer sheath is made of polyethylene, the cable may not be immersed in water. One 2.5U for each heating cycle test 0 The ac voltage applied to the conductor and the metal shield, the voltage peaks are shown in table 4.
TABLE 4 stability test Voltage over time
Rated voltage U 0 /kV 3.6 6 8.7 12 18 21 26
Peak test voltage/kV 9 15 22 30 45 53.5 65
And (3) applying current to the sample conductor for heating, and selecting proper current until the conductor reaches a stable temperature, wherein the temperature exceeds the highest temperature of the conductor, which is the highest temperature of the conductor for normal operation of the cable, by 0K-5K. The heating current of the three-core cable should pass through all conductors. At each heating cycle, the conductor should reach a stable temperature after 3 hours of electrical heating. After 12h, the load current was turned off, and then the sample remained off for 12h. The heating cycle was performed 5 times per week. During the test, at least 30 thermal cycle tests should be performed, and the time of the voltage applied to the cable is not less than 1000 hours in total.
During the test, the entire cable sample was free of breakdown. After load cycle testing, the 3m cable sample immersed in the water tank was completely disassembled and inspected for normal or corrected vision (without magnifier), the sample should have no apparent change.
11. Insulating mechanical properties: the tensile strength before aging is not less than 20MPa, and the elongation at break is not less than 350%; after aging for 135 x 10d, the tensile strength is not less than 20MPa, and the elongation at break is not less than 350%.
12. Insulation high temperature pressure test: k is 0.7, and the indentation depth is not more than 50% after the test at 130 ℃ for 6 hours.
13. Insulation water absorption test: after 85 ℃ for 336h, the water absorption is less than or equal to 3.0mg/cm 2 。
14. Insulation shrinkage test: the marking distance is 200mm, and the shrinkage rate is less than or equal to 4% after a test at 130 ℃ for 1 h.

Claims (9)

1. The manufacturing method of the environment-friendly medium-voltage power cable comprises the following steps: 1) Manufacturing a wire core; 2) Manufacturing a cable core; 3) The manufacturing of the protective layer is characterized in that
The step 1) comprises the following steps:
1.1 Wrapping a semiconductive shield around the conductor:
the semi-conductive shielding layer is made of extruded environment-friendly polypropylene semi-conductive material,
or the semi-conductive shielding layer is formed by wrapping a semi-conductive band outside a conductor and then extruding environment-friendly polypropylene semi-conductive material outside the semi-conductive band;
1.2 Wrapping the insulating layer: the insulating layer is formed by extruding and packing environment-friendly polypropylene elastomer insulating materials;
1.3 Wrapping the semi-conductive insulating shielding layer:
the semi-conductive insulating shielding layer is formed by extruding and wrapping strippable or non-strippable environment-friendly polypropylene semi-conductive material to form a semi-conductive material extrusion layer, and the semi-conductive material extrusion layer is externally wrapped with a semi-conductive tape;
in the steps 1.1) to 1.3), the environment-friendly polypropylene semi-conductive material of the semi-conductive semiconductor shielding layer, the environment-friendly polypropylene elastomer insulating material of the insulating layer and the environment-friendly polypropylene semi-conductive material of the semi-conductive insulating shielding layer are three-layer coextrusion methods; the technological requirements of three-layer coextrusion are as follows:
from the feeding to the discharging direction, the temperature of the three-layer co-extrusion machine body is controlled as follows:
the temperature of the first region to the fourth region of the first extruder for manufacturing the environment-friendly polypropylene semiconductor conductive material of the semiconductor shielding layer is as follows: 95-105 ℃, 135-145 ℃, 185-195 ℃ and 185-195 ℃;
the temperature of the first region to the sixth region of the second extruder for manufacturing the environment-friendly polypropylene elastomer insulating material of the insulating layer is sequentially as follows: 75-85 ℃, 125-135 ℃, 170-180 ℃, 185-195 ℃, 190-200 ℃ and 190-200 ℃;
the temperature of the first region to the fifth region of the third extruder for manufacturing the environment-friendly polypropylene semiconductive material of the semiconductive insulating shielding layer is as follows: 95-105 ℃, 135-145 ℃, 185-195 ℃ and 185-195 ℃;
each extruder: the first area is a feeding section, the second area and the third area are plasticizing sections, and the fourth area and the later are homogenizing sections;
the first extruder uses a 20 mesh, 80 mesh and 20 mesh discharging filter screen;
the second extruder uses a discharge filter screen with 80 meshes, 200 meshes, 80 meshes and 20 meshes;
the third extruder uses a 20 mesh, 80 mesh and 20 mesh discharging filter screen;
the temperature of the neck section of the first extruder is 185-195 ℃;
the temperature of the neck section of the second extruder is 190-200 ℃;
the temperature of the neck section of the third extruder is 185-195 ℃;
the first extruder, the second extruder and the third extruder use three-layer coextrusion heads, the heads are heated by an oil hot die temperature meter, and the temperature is 220-230 ℃;
directly cooling the three layers by cold water after extrusion;
1.4 A metal shielding layer is wrapped again:
the metal shielding layer is a copper strip shielding layer which is formed by one or more layers of soft copper strips overlapped and wrapped; the average covering rate of the copper strip is not less than 15%, the minimum covering rate of the copper strip is not less than 5%, and the nominal thickness of the copper strip is not less than 0.12mm;
alternatively, the metal shielding layer is a copper wire shielding layer; the outer surface of the copper wire shielding layer is tightly tied by a copper wire or a copper strip which is reversely wrapped; the average clearance between adjacent copper wires of the copper wire shielding layer is not more than 4mm;
the step 3) comprises the following steps:
3.1 Wrapping the first wrapping tape layer outside the cable core;
3.2 A first wrapping band layer is wrapped outside the inner sheath layer.
2. The method of claim 1, wherein the conductor is a copper or aluminum second type stranded compacted conductor, the direct current resistance and the number of monofilaments of the conductor meeting the requirements of GB/T3956; or the conductor is a longitudinal water blocking conductor.
3. The method of claim 1, wherein in step 3.1), the wrapping tape of the first wrapping tape layer is a nonwoven wrapping tape or a reinforced nonwoven wrapping tape having a nominal thickness of at least 0.2 mm;
in the step 3.2), the nominal thickness of the inner sheath layer is not less than 1.2mm; the sheath material forming the inner sheath layer is polyvinyl chloride or polyethylene.
4. A method of manufacturing a cable according to claim 1, 2 or 3, wherein the number of cores obtained in step 1) is 1, i.e. the single-wire core forms the cable core, and step 2) is skipped and step 3) is directly performed.
5. A method of manufacturing a cable according to claim 1, 2 or 3, wherein the core of the cable manufactured in step 1) is a plurality of cores, then:
step 2) comprises: twisting each wire core into a cable according to the pitch diameter ratio of 20-35 times; filling materials are filled between the first wrapping layer and each wire core;
step 3) further comprises:
3.3 A metal armor layer is wrapped outside the inner sheath layer;
the metal armor layer is a metal tape armor, the metal tape is a galvanized steel tape or a stainless steel tape, the nominal thickness of the metal tape is 0.5mm or 0.8mm, the wrapping gap is not more than 50% of the width of the tape, and the gap of the inner layer steel tape is covered by the part of the outer layer steel tape close to the middle;
or the metal armor layer is a metal wire armor, the metal wire is a galvanized steel wire or a stainless steel wire, the nominal diameter of the metal wire is 1.25mm, 1.6mm, 2.0mm, 2.5mm or 3.15mm, the total armor gap is not more than the diameter of one steel wire, and the pitch diameter ratio is 12-16 times;
3.4 Wrapping a second wrapping band layer outside the metal armor layer;
the wrapping tape of the second wrapping tape layer is a non-woven fabric wrapping tape or a reinforced non-woven fabric wrapping tape with the nominal thickness of at least 0.2 mm; the lapping coverage rate of the second lapping tape layer is not less than 15%, and the minimum lapping width is not less than 5mm;
3.5 Wrapping an outer sheath layer outside the second wrapping belt layer;
the sheath material forming the outer sheath layer is polyvinyl chloride or polyethylene; the nominal thickness of the outer jacket layer is not less than 1.8mm.
6. The method of manufacturing a cable according to claim 5, wherein the filler is a non-hygroscopic polypropylene filler rope.
7. A single-wire core cable made by the method of manufacture of claim 4 comprising: cable core, first around band layer and inner sheath layer, wherein:
the conductor and the semiconductive conductor shielding layer, the insulating layer and the semiconductive insulating shielding layer which are sequentially wrapped from inside to outside form an insulating wire core; the outer part of the insulated wire core is sequentially wrapped with a metal shielding layer from inside to outside to form a cable core; the cable core is from inside to outside wrapped up first around band layer and inner sheath layer in proper order outward, wherein:
the semi-conductive semiconductor shielding layer is formed by wrapping an environment-friendly polypropylene semi-conductive layer by extrusion, or wrapping a semi-conductive belt outside a conductor, and wrapping the environment-friendly polypropylene semi-conductive layer outside the semi-conductive belt;
the semiconductor shielding layer is tightly combined with the insulating layer, the contact interface between the semiconductor shielding layer and the insulating layer is smooth, and the thickness of the thinnest point of the semiconductor shielding layer is not less than 0.5mm;
the insulating layer is an insulating layer formed by extruded environment-friendly polypropylene elastomer insulating materials; the nominal thickness of the insulating layer is not less than the corresponding nominal thickness of the crosslinked polyethylene XLPE insulation in GB/T12706, and the thickness of the thinnest point of the insulating layer is not less than 90 percent of the nominal thickness value of the insulating layer by 0.1mm;
the semiconductive insulating shield layer includes: extruding and wrapping strippable or non-strippable environment-friendly polypropylene semi-conductive material to form a semi-conductive material extrusion coating, and wrapping a semi-conductive tape outside the semi-conductive material extrusion coating;
the semiconducting insulating shielding layer is tightly combined with or can be peeled off from the insulating layer, the contact interface between the semiconducting insulating shielding layer and the insulating layer is smooth, and the thickness of the thinnest point of the semiconducting insulating shielding layer is not less than 0.5mm;
the sheath material forming the inner sheath layer is polyvinyl chloride or polyethylene;
the metal shielding layer is a copper strip shielding layer or a copper wire shielding layer;
the outer surface of the copper wire shielding layer is tightly tied by the reversely wrapped copper wires or copper strips, and the average gap between adjacent copper wires of the copper wire shielding layer is not more than 4mm;
the copper strip shielding layer is formed by one or more layers of soft copper strips which are overlapped and wrapped; the average covering rate of the copper strip is not less than 15%, the minimum covering rate of the copper strip is not less than 5%, and the nominal thickness of the copper strip is not less than 0.12mm;
the wrapping tape of the first wrapping tape layer is a non-woven fabric wrapping tape or a reinforced non-woven fabric wrapping tape with the nominal thickness of at least 0.2 mm;
the nominal thickness of the inner sheath layer is not less than 1.2mm.
8. A multi-wire cable made by the method of manufacture of claim 5, comprising a cable core formed from a plurality of mutually stranded wire cores; the cable core is sequentially wrapped with a first wrapping band layer, an inner sheath layer, a metal armor layer, a second wrapping band layer and an outer sheath layer from inside to outside;
the structure for any wire core is as follows: the conductor is sequentially wrapped with a semiconductive shielding layer, an insulating layer, a semiconductive insulating shielding layer and a metal shielding layer from inside to outside,
the semi-conductive shielding layer is formed by wrapping an environment-friendly polypropylene semi-conductive layer by extrusion, or wrapping a semi-conductive belt outside a conductor and wrapping the environment-friendly polypropylene semi-conductive layer outside the semi-conductive belt; the semiconductor shielding layer is tightly combined with the insulating layer, the contact interface between the semiconductor shielding layer and the insulating layer is smooth, and the thickness of the thinnest point of the semiconductor shielding layer is not less than 0.5mm;
the insulating layer is formed by extruding and packing environment-friendly polypropylene elastomer insulating materials; the nominal thickness of the insulating layer is not less than the corresponding nominal thickness of the crosslinked polyethylene XLPE insulation in GB/T12706, and the thickness of the thinnest point of the insulating layer is not less than 90 percent of the nominal thickness value of the insulating layer by 0.1mm;
the semi-conductive insulating shielding layer is formed by wrapping an environment-friendly polypropylene semi-conductive material which can be stripped or not stripped to form a semi-conductive material extrusion layer, and the semi-conductive material extrusion layer is wrapped with a semi-conductive tape; the semi-conductive insulating shielding layer is tightly combined with the insulating layer or can be peeled off, the contact interface between the semi-conductive insulating shielding layer and the insulating layer is smooth, and the thickness of the thinnest point of the semi-conductive insulating shielding layer is not less than 0.5mm;
and filling materials are filled between the first wrapping layer and each wire core.
9. The multi-wire cable of claim 8 wherein the filler is a non-hygroscopic polypropylene filler rope.
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