CN114927270B - Aluminum alloy core crosslinked ethylene insulation low-smoke halogen-free polyolefin sheath flame-retardant power cable and preparation process thereof - Google Patents
Aluminum alloy core crosslinked ethylene insulation low-smoke halogen-free polyolefin sheath flame-retardant power cable and preparation process thereof Download PDFInfo
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 86
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 239000003063 flame retardant Substances 0.000 title claims abstract description 79
- 239000000779 smoke Substances 0.000 title claims abstract description 65
- 229920000098 polyolefin Polymers 0.000 title claims abstract description 64
- 238000009413 insulation Methods 0.000 title claims abstract description 58
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 239000005977 Ethylene Substances 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- 239000004020 conductor Substances 0.000 claims abstract description 129
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 125
- 239000004677 Nylon Substances 0.000 claims abstract description 73
- 229920001778 nylon Polymers 0.000 claims abstract description 73
- 229910052802 copper Inorganic materials 0.000 claims description 63
- 239000010949 copper Substances 0.000 claims description 63
- 239000003365 glass fiber Substances 0.000 claims description 42
- 238000004804 winding Methods 0.000 claims description 30
- 239000004743 Polypropylene Substances 0.000 claims description 21
- 230000006835 compression Effects 0.000 claims description 15
- 238000007906 compression Methods 0.000 claims description 15
- 238000001125 extrusion Methods 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 11
- -1 polypropylene Polymers 0.000 claims description 10
- 229920001155 polypropylene Polymers 0.000 claims description 10
- 229910052736 halogen Inorganic materials 0.000 claims description 2
- 150000002367 halogens Chemical class 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 26
- 230000005684 electric field Effects 0.000 abstract description 15
- 239000010410 layer Substances 0.000 description 222
- 229910000831 Steel Inorganic materials 0.000 description 19
- 239000010959 steel Substances 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 9
- 238000005056 compaction Methods 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/26—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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Insulated Conductors (AREA)
Abstract
The invention belongs to the technical field of power cable preparation, and particularly relates to an aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free flame-retardant power cable and preparation thereof. The technical points are as follows: the cable comprises a conductor, a conductor inner shielding layer, an insulating shielding layer, a copper wire shielding layer, an armor and an outer sheath from inside to outside; the conductor is an aluminum alloy molded line and is externally wrapped by a semiconductive nylon belt; and the insulating shielding layer is externally wrapped by the semiconductive nylon belt to obtain the shielding layer. The aluminum alloy core crosslinked ethylene insulation low-smoke halogen-free polyolefin sheath flame-retardant power cable and the preparation process thereof solve the technical problem of electric field nonuniformity caused by the aluminum alloy molded lines as conductors, effectively improve the mechanical property of the insulation layer and the electrical property of the power cable, and enable the aluminum alloy molded lines to be widely applied to power cable materials.
Description
Technical Field
The invention belongs to the technical field of power cable preparation, and particularly relates to an aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable and a preparation process thereof.
Background
The power cable is used for transmitting and distributing electric energy, is commonly used for urban underground power grids, power station leading-out lines, power supply inside industrial and mining enterprises and river-crossing and sea underwater power transmission lines, and a conductor of the power cable is generally formed by stranded copper single wires and plays a role in carrying current.
Power cables usually use copper wires or aluminum wires as conductors, but the copper wires or aluminum wires are expensive and the weight of the copper wires is too large. In the prior art, an aluminum alloy molded line is usually adopted to replace a copper wire or an aluminum wire as a conductor. However, the tensile strength of the aluminum alloy type wire filaments is small, and the gaps between the aluminum alloy type wire filaments are large, which easily causes the non-uniformity of the electric field, and the long-term use will cause the reduction of the mechanical property of the insulating layer, thereby causing the reduction of the electrical property.
In view of the defects of the prior art of using aluminum alloy as a power cable conductor, the inventor of the invention actively researches and innovates based on practical experience and professional knowledge of designing and manufacturing the material for many years and by matching with the application of theory, so as to create an aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable and a preparation process thereof. After continuous research and design, and repeated trial production and improvement, the invention with practical value is finally created.
Disclosure of Invention
The invention aims to provide an aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheathed flame-retardant power cable, which solves the technical problems of nonuniform electric field, reduced mechanical property of an insulating layer and reduced electrical property of the power cable caused by taking an aluminum alloy molded line as a conductor.
The technical purpose of the invention is realized by the following technical scheme:
the invention provides an aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable which comprises a conductor, a conductor inner shielding layer, an insulating shielding layer, a copper wire shielding layer, an armor and an outer sheath, wherein a glass fiber tape is wrapped outside the insulating shielding layer; the conductor is an aluminum alloy molded line and is externally wrapped by a semiconductive nylon belt; the insulating shielding layer is externally wrapped by a semiconductive nylon belt; the overlapping rate of the semi-conductive nylon belt wrapped outside the conductor is calculated by the following formula: m is 1 ＝1-a·S 1 /S 2 ，m 1 The overlapping rate of the semiconductive nylon belt wrapped outside the conductor is calculated in unit, a is the compression coefficient of the aluminum alloy molded line and is calculated in unit of 1,S 1 And S 2 The tensile strength of the single wires of the aluminum alloy molded line and the copper wire is respectively, and the unit is MPa. The reason for using a profile as a conductor in the present invention is that the profile is not round and only then the compaction factor can be increased to 0More than 95.
Furthermore, the compression coefficient a of the aluminum alloy molded line is more than or equal to 0.96.
In the invention, the semi-conductive nylon belt is adopted to wrap the conductor and the insulation shielding layer, so that the uniformity of an electric field can be effectively improved; and meanwhile, two parameters of the compaction coefficient and the tensile strength of the monofilament are adopted to limit the capping rate of the aluminum alloy conductor, so that the optimal capping rate is selected while the capping rate is ensured to be enough to compensate the uniformity of an electric field. If the lapping rate is too high, the eccentricity of the cable core is too high. The reason for adopting the two parameters is that if the compression coefficient is low, the uniformity of the electric field is reduced, and at the moment, higher overlapping rate is needed to improve the uniformity of the electric field; too low tensile strength of the monofilaments also causes the electric field strength to be not uniform enough, and meanwhile, the service life of the cable is reduced, so that the cover overlapping rate needs to be improved to make up the non-uniformity of the electric field strength and the service life caused by the reduction of the tensile strength of the monofilaments.
Furthermore, the overlapping rate of the semiconductive nylon belt wrapped outside the insulation shielding layer is m 2 In units of%, and m 2 ＝m 1 1- α; wherein alpha is the eccentricity of the conductor inner shielding layer, the insulating layer and the insulating shielding layer after the three-layer co-extrusion, and the unit is%.
According to the invention, the covering rate of the semiconductive nylon belt on the surface of the aluminum alloy type wire conductor and the eccentricity of the three-layer co-extruded semiconductive nylon belt are adopted to limit the covering rate of the semiconductive nylon belt wrapped outside the insulation shielding layer, and the technical effects that under the condition of reducing the eccentricity, the stress following performance between the conductor and the insulation shielding layer is ensured, and the phenomenon that the conductor and the insulation shielding layer are peeled or twisted when stressed to influence the mechanical performance, the electrical performance and the service life of the power cable is avoided.
Further, m 1 The thickness of the inner shielding layer of the conductor and the thickness of the insulating shielding layer are corrected, and the specific formula is as follows: m is 1 ＝(1-a·S 1 /S 2 )·h 1 /h 2 Wherein h is 1 Is the thickness of the conductor inner shielding layer, and the unit is mm, h 2 Is the thickness of the insulating shield layer in mm.
Because the invention adopts the three-layer co-extrusion method, the thickness of the inner shielding layer of the conductor and the thickness of the insulating shielding layer are adopted to simultaneously limit the overlapping rate of the semiconductor nylon belt wrapped by the conductor, so that the eccentricity after the three-layer co-extrusion is ensured to be smaller, and the stress following performance between the three layers is improved to avoid the interlayer stripping. The stress following performance between the three layers can be ensured only when the thickness of the three layers in coextrusion is matched with the tensile strength of the monofilament.
Furthermore, the eccentricity alpha of the three-layer co-extruded film is less than or equal to 6 percent.
Furthermore, the thickness of the inner shielding layer of the conductor is 0.8-1.0 mm, the thickness of the insulating layer is 10.5-10.8 mm, and the thickness of the insulating shielding layer is 0.8-1.0 mm.
Furthermore, the thickness of the semiconductive nylon belt is 0.06-0.1 mm. If the thickness of the semiconductive nylon belt is too small, a higher overlapping rate is required to function as a uniform electric field, and if the overlapping rate is too high, the eccentricity is too high.
Furthermore, the copper wire shielding layer is formed by shielding the copper wire in a sparse winding manner, the pitch diameter ratio is 10-12, and the average gap of the copper wire is less than or equal to 4mm.
Further, a layer of copper strip is reversely wrapped on the outer layer of the copper wire, and the shielding sectional area of the copper wire is 35-50 mm 2 . According to the invention, the copper wire and the copper strip are combined and wrapped, so that short-circuit current protection can be effectively improved.
The second purpose of the invention is to provide a preparation process of the aluminum alloy core crosslinked ethylene insulation low-smoke halogen-free polyolefin sheath flame-retardant power cable, which has the same technical effect.
The technical purpose of the invention is realized by the following technical scheme:
the invention provides a preparation process of an aluminum alloy core crosslinked ethylene insulation low-smoke halogen-free polyolefin sheath flame-retardant power cable, which comprises the following process steps:
s1, winding a semi-conductive nylon belt on the outer side of a conductor to obtain an inner shielding layer of the conductor, and reducing the influence of conductor burrs on insulation;
s2, winding the semi-conductive nylon belt on the outer side of the insulating shielding layer to prevent the insulating layer from being expanded and deformed by heating;
s3, the inner shielding layer and the insulating layer of the conductor in the step S1 and the insulating shielding layer in the step S2 are co-extruded to form a cross-linked wire core, so that the interface is smoother, and the insulating electrical property is improved;
s4, manufacturing the inner conductor obtained in the step S3 into a cable core by adopting a flame-retardant doubled PP (polypropylene) filling rope, wherein the out-of-roundness beta is less than or equal to 5-8%, and a glass fiber tape is wrapped on the outer side of the cable core;
and S5, sequentially wrapping the copper wire shielding layer, the armor and the outer sheath on the outer side of the cable core obtained in the step S4 to obtain the power cable.
Further, the cover overlapping rate m of the glass fiber tape in the step S4 3 Calculated by the following formula: m is 3 ＝m 1 (1- α)/(1- β); wherein m is 1 The covering rate of the semiconductive nylon belt wrapped outside the conductor is represented by the percentage, wherein alpha is the eccentricity of the three layers of the inner shielding layer, the insulating layer and the insulating shielding layer of the conductor after co-extrusion, and the percentage is represented by the percentage, and beta is the out-of-roundness of the cable core.
The eccentricity of the three-layer co-extrusion and the out-of-roundness of the cable core limit the cover overlapping rate of the glass fiber tape, and the purpose is to select the appropriate cover overlapping rate under the condition of ensuring small eccentricity and out-of-roundness. If the eccentricity is too large or the out-of-roundness is too large, the compressive strength and tensile strength of the cable may be reduced.
Furthermore, the copper wire cannot be oxidized.
Furthermore, the thickness of the overlapping copper strip is 0.1mm.
Furthermore, two layers of 0.2mm glass fiber tapes are lapped outside the cable core in an overlapping mode, the lapping rate is not lower than 25%, the overlapping wrapping structure is tighter, and the roundness of the cable can be guaranteed better.
Furthermore, the copper wire shielding layer is made of flame-retardant A-grade low-smoke halogen-free polyolefin sheath material, and the thickness is 2.4-3.0 mm.
Further, armoring: the double-layer steel belt gap is wrapped, the compression resistance is improved, the thickness is 0.8mm, and the steel belt gap is not more than 50%.
Further, the outer sheath: the flame-retardant A-grade low-smoke halogen-free polyolefin sheath material is adopted, the thickness is 5.0-5.5 mm, and the out-of-roundness of the cable is less than or equal to 10%.
According to the invention, the overlapping rate of the glass fiber belt is limited by adopting the formula, so that on one hand, the integral out-of-roundness of the power cable is reduced, and on the other hand, the integral stress following performance in the power cable is ensured, thus the mechanical strength of the power cable is improved, and the service life of the power cable is prolonged.
In conclusion, the invention has the following beneficial effects:
the aluminum alloy core crosslinked ethylene insulation low-smoke halogen-free polyolefin sheath flame-retardant power cable and the preparation process thereof solve the technical problem of electric field nonuniformity caused by the aluminum alloy molded lines as conductors, effectively improve the mechanical property of the insulation layer and the electrical property of the power cable, and enable the aluminum alloy molded lines to be widely applied to power cable materials.
Detailed Description
To further illustrate the technical means and effects adopted by the present invention to achieve the predetermined object, the specific embodiments, features and effects of the flame retardant power cable with the aluminum alloy core crosslinked ethylene insulating low smoke zero halogen polyolefin sheath and the preparation process thereof according to the present invention are described in detail as follows.
The raw materials adopted in the invention are as follows:
aluminum alloy molded line: the method is carried out by outsourcing,
copper wire: lu An Hongtai novel copper material science and technology Yixing Limited company, with copper content not less than 99.96 and twisting not less than 30 times
Copper strip: yixing City good time electrical material Co., ltd, tensile strength not less than 250MPa
Semiconductive nylon belt: tensile strength is more than or equal to 150N/mm 2
The flame-retardant A-grade low-smoke halogen-free polyolefin sheath material comprises the following components: jiangsu Yisheng high molecular material Limited company, flame retardant, oxygen index more than or equal to 36, tensile strength of the sheath before aging more than or equal to 12.0Mpa
Steel strip: rituqiu Baihui Steel strip Co Ltd, tensile strength not less than 450N/mm 2
Glass fiber belt: henglong cable material of Wuxi city, inc., flame-retardant, oxygen index greater than or equal to 36
Flame-retardant stranded PP filling rope: henglong cable material of Wuxi city, inc., flame retardant, oxygen index greater than or equal to 36.
Example 1: aluminum alloy core crosslinked ethylene insulation low-smoke halogen-free polyolefin sheath flame-retardant power cable and preparation process thereof
The aluminum alloy core crosslinked ethylene insulation low-smoke halogen-free polyolefin sheath flame-retardant power cable provided by the embodiment has the out-of-roundness of 8%, and comprises a conductor and an aluminum alloy molded line from inside to outside, wherein the compression coefficient is a =0.95, and the tensile strength of a monofilament is 160MPa; the thickness of the conductor inner shielding layer is 0.8mm; the insulating layer is 11mm in thickness, copper wires are adopted for sparse winding shielding, the pitch-diameter ratio is 10, the average gap of the copper wires is 4mm, the single wire tensile strength of the copper wires is 180MPa, a layer of copper strips is reversely wound on the outer layers of the copper wires, and the shielding sectional area of the copper wires is 35mm 2 (ii) a The insulating shielding layer is 1.0mm in thickness; the copper wire shielding layer is a flame-retardant A-grade low-smoke halogen-free polyolefin sheath material, and the thickness of the copper wire shielding layer is 2.5mm; armoring, namely lapping a double-layer steel belt gap with the thickness of 0.8mm and the steel belt gap of 45%; an outer sheath, a flame-retardant A-grade low-smoke halogen-free polyolefin sheath material with the thickness of 5.5mm.
Wherein, the semiconductive nylon belt is wrapped around to the conductor outside, and the rate of overlapping is according to the formula: m is 1 ＝1-a·S 1 /S 2 Calculated, 15.5%; a is the compression coefficient of the aluminum alloy molded line, and the unit is 1,S 1 And S 2 The single wire tensile strength of the aluminum alloy molded line and the copper wire respectively is in MPa;
the insulating shielding layer is externally wrapped by a semiconductive nylon belt, and the covering rate is according to the formula: m is 2 ＝m 1 Calculated as (1-. Alpha.) 14.7%; alpha is a conductor inner shielding layer, 5% of eccentricity after three layers of an insulating layer and an insulating shielding layer are co-extruded is selected in the embodiment, and a glass fiber tape is wrapped outside;
the thickness of the semiconductive nylon tape was 0.1mm.
The preparation process of the aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable provided by the embodiment comprises the following process steps:
s1, winding a semi-conductive nylon belt on the outer side of a conductor to obtain a conductor inner shielding layer;
s2, winding the semi-conductive nylon belt on the outer side of the insulation shielding layer;
s3, forming an inner conductor by the conductor inner shielding layer, the insulation shielding layer and the insulation layer obtained in the steps S1 and S2 in a three-layer co-extrusion mode;
s4, manufacturing the inner conductor obtained in the step S3 into a cable core by adopting a flame-retardant doubled PP (polypropylene) filling rope, wherein the out-of-roundness beta =6%, and the outer side of the cable core is wrapped with a glass fiber tape;
and S5, sequentially wrapping the copper wire shielding layer, the armor and the outer sheath on the outer side of the cable core obtained in the step S4 to obtain the power cable.
Wherein the cover overlapping rate m of the glass fiber tape in the step S4 3 Calculated by the following formula: m is 3 ＝m 1 11.1% for (1- α)/(1- β); wherein beta is the out-of-roundness of the cable core, and the unit is%.
Wherein, the copper wire can not have oxidation phenomenon; the thickness of the copper strip is 0.1mm; two layers of 0.2mm glass fiber tapes are lapped and wrapped outside the cable core.
Example 2: aluminum alloy core crosslinked ethylene insulation low-smoke halogen-free polyolefin sheath flame-retardant power cable and preparation process thereof
The aluminum alloy core crosslinked ethylene insulation low-smoke halogen-free polyolefin sheath flame-retardant power cable provided by the embodiment has the out-of-roundness of 8%, and comprises a conductor and an aluminum alloy molded line from inside to outside, wherein the compression coefficient is a =0.95, and the tensile strength of a monofilament is 160MPa; the thickness of the conductor inner shielding layer is 0.8mm; the thickness of the insulating layer is 11mm, copper wires are adopted for sparse winding shielding, the pitch-diameter ratio is 10, the average gap of the copper wires is 4mm, the single wire tensile strength of the copper wires is 180MPa, a layer of copper strips is reversely wound on the outer layers of the copper wires, and the shielding sectional area of the copper wires is 35mm 2 (ii) a The insulating shielding layer is 1.0mm in thickness; the copper wire shielding layer is a flame-retardant A-grade low-smoke halogen-free polyolefin sheath material, and the thickness of the copper wire shielding layer is 2.5mm; armoring, namely lapping a double-layer steel belt gap with the thickness of 0.8mm and the steel belt gap of 45%; an outer sheath, a flame-retardant A-grade low-smoke halogen-free polyolefin sheath material with the thickness of 5.5mm.
Wherein, the semiconductive nylon belt is wrapped around to the conductor outside, and the rate of overlapping is according to the formula: m is 1 ＝(1-a·S 1 /S 2 )·h 1 /h 2 12.4%, a is the compaction coefficient of the aluminum alloy profile in units of 1,S 1 And S 2 The tensile strength of the single wire of the aluminum alloy molded line and the copper wire respectively is in units of MPa and h 1 Is the thickness of the conductor inner shielding layer, and the unit is mm, h 2 Is the thickness of the insulating shielding layer, and the unit is mm;
the insulating shielding layer is externally wrapped by a semiconductive nylon belt, and the covering rate is according to the formula: m is a unit of 2 ＝m 1 Calculated as (1-. Alpha.) 11.8%; alpha is a conductor inner shielding layer, 5% of eccentricity after three layers of an insulating layer and an insulating shielding layer are co-extruded is selected in the embodiment, and a glass fiber tape is wrapped outside;
the thickness of the semiconductive nylon tape was 0.1mm.
The preparation process of the aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable provided by the embodiment comprises the following process steps:
s1, winding a semi-conductive nylon belt on the outer side of a conductor to obtain a conductor inner shielding layer;
s2, winding the semi-conductive nylon belt on the outer side of the insulation shielding layer;
s3, forming an inner conductor by the conductor inner shielding layer, the insulation shielding layer and the insulation layer obtained in the steps S1 and S2 in a three-layer co-extrusion mode;
s4, manufacturing the inner conductor obtained in the step S3 into a cable core by adopting a flame-retardant doubled PP (polypropylene) filling rope, wherein the out-of-roundness beta =6%, and the outer side of the cable core is wrapped with a glass fiber tape;
and S5, sequentially wrapping the copper wire shielding layer, the armor and the outer sheath on the outer side of the cable core obtained in the step S4 to obtain the power cable.
Wherein the cover overlapping rate m of the glass fiber belt in the step S4 3 Calculated by the following formula: m is 3 ＝m 1 11.1% for (1- α)/(1- β); wherein m is 1 The covering rate of the semi-conductive nylon belt wrapped outside the conductor is expressed in percentage by weight, and beta is the out-of-roundness of the cable core expressed in percentage by weight.
Wherein, the copper wire can not have oxidation phenomenon; the thickness of the copper strip is 0.1mm; two layers of 0.2mm glass fiber tapes are lapped and wrapped outside the cable core.
Example 3: aluminum alloy core crosslinked ethylene insulation low-smoke halogen-free polyolefin sheath flame-retardant power cable and preparation process thereof
The aluminum alloy core crosslinked ethylene insulation low-smoke halogen-free polyolefin sheath flame-retardant power cable provided by the embodiment has the out-of-roundness of 8%, and comprises a conductor and an aluminum alloy molded line from inside to outside, wherein the compression coefficient is a =0.97, and the tensile strength of a monofilament is 160MPa; the thickness of the conductor inner shielding layer is 1.0mm; the insulating layer is 11.5mm in thickness, copper wires are adopted for sparse winding shielding, the pitch-diameter ratio is 10, the average gap of the copper wires is 4mm, the single wire tensile strength of the copper wires is 180Mpa, a layer of copper strips is reversely wound on the outer layers of the copper wires, and the shielding sectional area of the copper wires is 38mm 2 (ii) a The insulating shielding layer is 0.9mm in thickness; the copper wire shielding layer is a flame-retardant A-grade low-smoke halogen-free polyolefin sheath material, and the thickness of the copper wire shielding layer is 2.5mm; armoring, namely lapping a double-layer steel belt gap with the thickness of 0.8mm and the steel belt gap of 45%; the outer sheath is a flame-retardant A-grade low-smoke halogen-free polyolefin sheath material with the thickness of 5.5mm.
Wherein, the semiconductive nylon belt is wrapped around to the conductor outside, and the rate of overlapping is according to the formula: m is 1 ＝1-a·S 1 /S 2 Calculated, 13.7%; a is the compression coefficient of the aluminum alloy molded line, and the unit is 1,S 1 And S 2 The tensile strength of the single wires of the aluminum alloy molded line and the copper wire is respectively, and the unit is MPa;
the insulating shielding layer is externally wrapped by a semiconductive nylon belt, and the covering rate is according to the formula: m is 2 ＝m 1 Calculated as (1-. Alpha.) 13.2%; alpha is a conductor inner shielding layer, 4% of eccentricity after three layers of an insulating layer and an insulating shielding layer are co-extruded is selected in the embodiment, and a glass fiber tape is wrapped outside;
the thickness of the semiconductive nylon tape was 0.1mm.
The preparation process of the aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable provided by the embodiment comprises the following process steps:
s1, winding a semi-conductive nylon belt on the outer side of a conductor to obtain a conductor inner shielding layer;
s2, winding the semi-conductive nylon belt on the outer side of the insulation shielding layer;
s3, forming an inner conductor by the conductor inner shielding layer, the insulation shielding layer and the insulation layer obtained in the steps S1 and S2 in a three-layer co-extrusion mode;
s4, manufacturing the inner conductor obtained in the step S3 into a cable core by adopting a flame-retardant doubled PP (polypropylene) filling rope, wherein the out-of-roundness beta =5%, and the outer side of the cable core is wrapped with a glass fiber tape;
and S5, sequentially wrapping the copper wire shielding layer, the armor and the outer sheath on the outer side of the cable core obtained in the step S4 to obtain the power cable.
Wherein the cover overlapping rate m of the glass fiber tape in the step S4 3 Calculated by the following formula: m is a unit of 3 ＝m 1 12.6% for (1- α)/(1- β); wherein m is 1 The covering rate of the semi-conductive nylon belt wrapped outside the conductor is expressed in percentage by weight, and beta is the out-of-roundness of the cable core expressed in percentage by weight.
Wherein, the copper wire can not be oxidized; the thickness of the copper strip is 0.1mm; two layers of 0.2mm glass fiber tapes are lapped and wrapped outside the cable core.
Example 4: aluminum alloy core crosslinked ethylene insulation low-smoke halogen-free polyolefin sheath flame-retardant power cable and preparation process thereof
The aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable provided by the embodiment has the out-of-roundness of 8%, and comprises a conductor and an aluminum alloy molded line from inside to outside, wherein the compression coefficient is a =0.97, and the tensile strength of a monofilament is 160MPa; the thickness of the conductor inner shielding layer is 1.0mm; the insulating layer is 11.5mm in thickness, copper wires are adopted for sparse winding shielding, the pitch-diameter ratio is 10, the average gap of the copper wires is 4mm, the single wire tensile strength of the copper wires is 180MPa, a layer of copper strips is reversely wound on the outer layers of the copper wires, and the shielding sectional area of the copper wires is 38mm 2 (ii) a The insulating shielding layer is 0.8mm in thickness; the copper wire shielding layer is a flame-retardant A-grade low-smoke halogen-free polyolefin sheath material, and the thickness of the copper wire shielding layer is 2.5mm; armoring, namely lapping a double-layer steel belt gap with the thickness of 0.9mm and the steel belt gap of 45%; an outer sheath, a flame-retardant A-grade low-smoke halogen-free polyolefin sheath material with the thickness of 5.5mm.
Wherein, the semiconductive nylon belt is wrapped around to the conductor outside, and the rate of overlapping is according to the formula: m is 1 ＝(1-a·S 1 /S 2 )·h 1 /h 2 15.3% of a is an aluminum alloy typeThe compaction factor of the wire is given in 1,S 1 And S 2 The tensile strength of the single wire of the aluminum alloy molded line and the copper wire respectively is in units of MPa and h 1 Is the thickness of the conductor inner shielding layer, and the unit is mm, h 2 Is the thickness of the insulating shielding layer, and the unit is mm;
the insulating shielding layer is externally wrapped by a semiconductive nylon belt, and the covering rate is according to the formula: m is a unit of 2 ＝m 1 Calculated as (1-. Alpha.) 14.7%; alpha is a conductor inner shielding layer, 4% of eccentricity after three layers of an insulating layer and an insulating shielding layer are co-extruded is selected in the embodiment, and a glass fiber tape is wrapped outside;
the thickness of the semiconductive nylon tape was 0.1mm.
The preparation process of the aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable provided by the embodiment comprises the following process steps:
s1, winding a semi-conductive nylon belt on the outer side of a conductor to obtain a conductor inner shielding layer;
s2, winding the semi-conductive nylon belt on the outer side of the insulation shielding layer;
s3, forming an inner conductor by the conductor inner shielding layer, the insulation shielding layer and the insulation layer obtained in the steps S1 and S2 in a three-layer co-extrusion mode;
s4, manufacturing the inner conductor obtained in the step S3 into a cable core by adopting a flame-retardant doubled PP (polypropylene) filling rope, wherein the out-of-roundness beta =5%, and the outer side of the cable core is wrapped with a glass fiber tape;
and S5, sequentially wrapping the copper wire shielding layer, the armor and the outer sheath on the outer side of the cable core obtained in the step S4 to obtain the power cable.
Wherein the cover overlapping rate m of the glass fiber tape in the step S4 3 Calculated by the following formula: m is 3 ＝m 1 13.9% for (1- α)/(1- β); wherein m is 1 The covering rate of the semi-conductive nylon belt wrapped outside the conductor is expressed in percentage by weight, and beta is the out-of-roundness of the cable core expressed in percentage by weight.
Wherein, the copper wire can not have oxidation phenomenon; the thickness of the copper strip is 0.1mm; two layers of 0.2mm glass fiber tapes are lapped and wrapped outside the cable core.
Comparative example 1: aluminum alloy core crosslinked ethylene insulation low-smoke halogen-free polyolefin sheath flame-retardant power cable and preparation process thereof
The aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable provided by the embodiment has the out-of-roundness of 8%, and comprises a conductor and an aluminum alloy molded line from inside to outside, wherein the compression coefficient is a =0.95, and the tensile strength of a monofilament is 160MPa; the thickness of the conductor inner shielding layer is 0.8mm; the insulating layer is 11mm in thickness, copper wires are adopted for sparse winding shielding, the pitch-diameter ratio is 10, the average gap of the copper wires is 4mm, the single wire tensile strength of the copper wires is 180MPa, a layer of copper strips is reversely wound on the outer layers of the copper wires, and the shielding sectional area of the copper wires is 35mm 2 (ii) a The insulating shielding layer is 1.0mm in thickness; the copper wire shielding layer is a flame-retardant A-grade low-smoke halogen-free polyolefin sheath material, and the thickness of the copper wire shielding layer is 2.5mm; armoring, namely lapping a double-layer steel belt gap with the thickness of 0.8mm and the steel belt gap of 45%; an outer sheath, a flame-retardant A-grade low-smoke halogen-free polyolefin sheath material with the thickness of 5.5mm.
Wherein, the semi-conductive nylon belt is wrapped outside the conductor, and the covering rate is 15%;
the insulating shielding layer wraps the semiconductive nylon belt outside, the covering rate is 15%, and the glass fiber belt wraps the insulating shielding layer outside;
the thickness of the semiconductive nylon tape was 0.1mm.
The preparation process of the aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable provided by the embodiment comprises the following process steps:
s1, winding a semi-conductive nylon belt on the outer side of a conductor to obtain a conductor inner shielding layer;
s2, winding the semi-conductive nylon belt on the outer side of the insulation shielding layer;
s3, forming an inner conductor by the conductor inner shielding layer, the insulation shielding layer and the insulation layer obtained in the steps S1 and S2 in a three-layer co-extrusion mode;
s4, manufacturing the inner conductor obtained in the step S3 into a cable core by adopting a flame-retardant stranded PP (polypropylene) filling rope, wherein the out-of-roundness beta =6%, and a glass fiber tape is wrapped on the outer side of the cable core;
and S5, sequentially wrapping the copper wire shielding layer, the armor and the outer sheath on the outer side of the cable core obtained in the step S4 to obtain the power cable.
The cover overlapping rate of the glass fiber tape in step S4 is 15%.
Wherein, the copper wire can not be oxidized; the thickness of the copper strip is 0.1mm; two layers of 0.2mm glass fiber tapes are lapped and wrapped outside the cable core.
Comparative example 2: aluminum alloy core crosslinked ethylene insulation low-smoke halogen-free polyolefin sheath flame-retardant power cable and preparation process thereof
The aluminum alloy core crosslinked ethylene insulation low-smoke halogen-free polyolefin sheath flame-retardant power cable provided by the embodiment has the out-of-roundness of 8%, and comprises a conductor and an aluminum alloy molded line from inside to outside, wherein the compression coefficient is a =0.95, and the tensile strength of a monofilament is 160MPa; the thickness of the conductor inner shielding layer is 0.8mm; the insulating layer is 11mm in thickness, copper wires are adopted for sparse winding shielding, the pitch-diameter ratio is 10, the average gap of the copper wires is 4mm, the single wire tensile strength of the copper wires is 180MPa, a layer of copper strips is reversely wound on the outer layers of the copper wires, and the shielding sectional area of the copper wires is 35mm 2 (ii) a The insulating shielding layer is 1.0mm in thickness; the copper wire shielding layer is a flame-retardant A-grade low-smoke halogen-free polyolefin sheath material, and the thickness of the copper wire shielding layer is 2.5mm; armoring, namely lapping a double-layer steel belt gap with the thickness of 0.8mm and the steel belt gap of 45%; an outer sheath, a flame-retardant A-grade low-smoke halogen-free polyolefin sheath material with the thickness of 5.5mm.
Wherein, the outer part of the conductor is wrapped by a semi-conductive nylon belt, and the overlapping rate is 13 percent;
the insulating shielding layer is externally wrapped by a semiconductive nylon belt, the covering rate is 13 percent, and the insulating shielding layer is externally wrapped by a glass fiber belt;
the thickness of the semiconductive nylon tape was 0.1mm.
The preparation process of the aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable provided by the embodiment comprises the following process steps:
s1, winding a semi-conductive nylon belt on the outer side of a conductor to obtain a conductor inner shielding layer;
s2, winding the semi-conductive nylon belt on the outer side of the insulation shielding layer;
s3, forming an inner conductor by the conductor inner shielding layer, the insulation shielding layer and the insulation layer obtained in the steps S1 and S2 in a three-layer co-extrusion mode;
s4, manufacturing the inner conductor obtained in the step S3 into a cable core by adopting a flame-retardant doubled PP (polypropylene) filling rope, wherein the out-of-roundness beta =6%, and the outer side of the cable core is wrapped with a glass fiber tape;
and S5, sequentially wrapping the copper wire shielding layer, the armor and the outer sheath on the outer side of the cable core obtained in the step S4 to obtain the power cable.
The cover overlapping rate of the glass fiber tape in step S4 is 13%.
Wherein, the copper wire can not have oxidation phenomenon; the thickness of the copper strip is 0.1mm; two layers of 0.2mm glass fiber tapes are lapped and wrapped outside the cable core.
Comparative example 3: aluminum alloy core crosslinked ethylene insulation low-smoke halogen-free polyolefin sheath flame-retardant power cable and preparation process thereof
The aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable provided by the embodiment has the out-of-roundness of 8%, and comprises a conductor and an aluminum alloy molded line from inside to outside, wherein the compression coefficient is a =0.97, and the tensile strength of a monofilament is 160MPa; the thickness of the conductor inner shielding layer is 1.0mm; the insulating layer is 11.5mm in thickness, copper wires are adopted for sparse winding shielding, the pitch-diameter ratio is 10, the average gap of the copper wires is 4mm, the single wire tensile strength of the copper wires is 180MPa, a layer of copper strips is reversely wound on the outer layers of the copper wires, and the shielding sectional area of the copper wires is 38mm 2 (ii) a The insulating shielding layer is 0.8mm in thickness; the copper wire shielding layer is a flame-retardant A-grade low-smoke halogen-free polyolefin sheath material, and the thickness of the copper wire shielding layer is 2.5mm; armoring, namely lapping a double-layer steel belt gap with the thickness of 0.9mm and the steel belt gap of 45%; an outer sheath, a flame-retardant A-grade low-smoke halogen-free polyolefin sheath material with the thickness of 5.5mm.
Wherein, the semiconductive nylon belt is wrapped around to the conductor outside, and the rate of overlapping is according to the formula: m is 1 ＝(1-a·S 1 /S 2 )·h 1 /h 2 15.3 percent, and a is the compaction coefficient of the aluminum alloy molded line, and the unit is 1,S 1 And S 2 The tensile strength of the single wire of the aluminum alloy molded line and the copper wire respectively is in units of MPa and h 1 Is the thickness of the conductor inner shielding layer, and the unit is mm, h 2 Is the thickness of the insulating shielding layer, and the unit is mm;
the insulating shielding layer is externally wrapped by a semiconductive nylon belt, and the covering rate is according to the formula: m is 2 ＝m 1 Calculated as (1-. Alpha.) 14.7%; alpha is a conductor inner shielding layer, 4% of eccentricity after three layers of an insulating layer and an insulating shielding layer are co-extruded is selected in the embodiment, and a glass fiber tape is wrapped outside;
the thickness of the semiconductive nylon tape was 0.1mm.
The preparation process of the aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable provided by the embodiment comprises the following process steps:
s1, winding a semi-conductive nylon belt on the outer side of a conductor to obtain a conductor inner shielding layer;
s2, winding the semi-conductive nylon belt on the outer side of the insulation shielding layer;
s3, forming an inner conductor by the conductor inner shielding layer, the insulation shielding layer and the insulation layer obtained in the steps S1 and S2 in a three-layer co-extrusion mode;
s4, manufacturing the inner conductor obtained in the step S3 into a cable core by adopting a flame-retardant doubled PP (polypropylene) filling rope, wherein the out-of-roundness beta =5%, and the outer side of the cable core is wrapped with a glass fiber tape;
and S5, sequentially wrapping the copper wire shielding layer, the armor and the outer sheath on the outer side of the cable core obtained in the step S4 to obtain the power cable.
The cover overlapping rate of the glass fiber tape in step S4 was 14.7%.
Wherein, the copper wire can not have oxidation phenomenon; the thickness of the copper strip is 0.1mm; two layers of 0.2mm glass fiber tapes are lapped and wrapped outside the cable core.
Comparative example 4: aluminum alloy core crosslinked ethylene insulation low-smoke halogen-free polyolefin sheath flame-retardant power cable and preparation process thereof
The aluminum alloy core crosslinked ethylene insulation low-smoke halogen-free polyolefin sheath flame-retardant power cable provided by the embodiment has the out-of-roundness of 8%, and comprises a conductor and an aluminum alloy molded line from inside to outside, wherein the compression coefficient is a =0.97, and the tensile strength of a monofilament is 160MPa; the thickness of the conductor inner shielding layer is 1.0mm; an insulating layer with a thickness of 11.5mm, a copper wire sparse winding shielding layer with a pitch-diameter ratio of 10, an average gap of 4mm, a single wire tensile strength of 180MPa, a copper strip layer reversely wound on the outer layer of the copper wire, and a shielding sectional area of the copper wire38mm 2 (ii) a The insulating shielding layer is 0.8mm in thickness; the copper wire shielding layer is a flame-retardant A-grade low-smoke halogen-free polyolefin sheath material, and the thickness of the copper wire shielding layer is 2.5mm; armoring, namely lapping a double-layer steel belt gap with the thickness of 0.9mm and the steel belt gap of 45%; an outer sheath, a flame-retardant A-grade low-smoke halogen-free polyolefin sheath material with the thickness of 5.5mm.
Wherein, the semiconductive nylon belt is wrapped around to the conductor outside, and the rate of overlapping is according to the formula: m is 1 ＝(1-a·S 1 /S 2 )·h 1 /h 2 15.3 percent, and a is the compaction coefficient of the aluminum alloy molded line, and the unit is 1,S 1 And S 2 The tensile strength of the single wire of the aluminum alloy molded line and the copper wire respectively is in units of MPa and h 1 Is the thickness of the conductor inner shielding layer, and the unit is mm, h 2 Is the thickness of the insulating shielding layer, and the unit is mm;
the insulating shielding layer wraps the semiconductive nylon belt outside, the covering rate is 15.3%, and the glass fiber belt wraps the insulating shielding layer outside;
the thickness of the semiconductive nylon tape was 0.1mm.
The preparation process of the aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable provided by the embodiment comprises the following process steps:
s1, winding a semi-conductive nylon belt on the outer side of a conductor to obtain a conductor inner shielding layer;
s2, winding the semi-conductive nylon belt on the outer side of the insulation shielding layer;
s3, forming an inner conductor by the conductor inner shielding layer, the insulation shielding layer and the insulation layer obtained in the steps S1 and S2 in a three-layer co-extrusion mode;
s4, manufacturing the inner conductor obtained in the step S3 into a cable core by adopting a flame-retardant doubled PP (polypropylene) filling rope, wherein the out-of-roundness beta =5%, and the outer side of the cable core is wrapped with a glass fiber tape;
and S5, sequentially wrapping the copper wire shielding layer, the armor and the outer sheath on the outer side of the cable core obtained in the step S4 to obtain the power cable.
Wherein the cover overlapping rate m of the glass fiber belt in the step S4 3 Calculated by the following formula: m is a unit of 3 ＝m 1 13.9% for (1- α)/(1- β); wherein m is 1 Wrapping a conductor externally with a semi-conductive nylonThe covering rate of the belt is expressed in% and beta is the out-of-roundness of the cable core expressed in%.
Wherein, the copper wire can not have oxidation phenomenon; the thickness of the copper strip is 0.1mm; two layers of 0.2mm glass fiber tapes are lapped and wrapped outside the cable core.
Performance testing
The power cables obtained in examples 1 to 4 and comparative examples 1 to 4 were subjected to qualification tests, and the test items were a mechanical property test and an electric field uniformity test, and specific data are shown in the following table.
TABLE 1 Performance test data for examples 1-4 and comparative examples 1-4
As can be seen from comparison between examples 1 and 2 and between examples 3 and 4, the cover ratio of the semiconductive nylon tape wrapped around the outside of the conductor is corrected by using the thickness of the inner shield layer of the conductor and the thickness of the insulating shield layer, so that the eccentricity and the non-circularity of the entire power cable are reduced while the electric field strength is ensured to be uniform, and the mechanical and electrical properties of the power cable can be greatly improved.
According to the comparison between the comparative examples 1 and 2 and the example 1, the overlapping rate of the semiconductive nylon belt obtained by the calculation according to the formula provided by the invention is reduced in eccentricity and out-of-roundness of the whole power cable under the condition of ensuring uniform electric field intensity, and the mechanical property and the electrical property of the power cable can be effectively improved.
According to comparison between comparative example 3 and comparative example 4 and between example 2 and example 4, the formula provided by the invention is adopted to correct the overlapping rate of each layer, so that the eccentricity and the non-roundness of the whole power cable are reduced under the condition of ensuring uniform electric field intensity, and the mechanical property and the electrical property of the power cable can be effectively improved.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable is characterized by comprising a conductor, a conductor inner shielding layer, an insulating shielding layer, a copper wire shielding layer, an armor and an outer sheath from inside to outside, wherein the insulating shielding layer is externally wrapped by a glass fiber tape;
the conductor is an aluminum alloy molded line and is externally wrapped by a semiconductive nylon belt; the outer part of the insulation shielding layer is wrapped by a semi-conductive nylon strip; the overlapping rate of the semi-conductive nylon belt wrapped outside the conductor is calculated by the following formula: m is 1 =1-a·S 1 /S 2 ，m 1 The covering rate of the semi-conductive nylon belt wrapped outside the conductor is shown in the specification, a is the compression coefficient of the aluminum alloy molded line and is represented by 1,S 1 And S 2 The tensile strength of the single wires of the aluminum alloy molded line and the copper wire is respectively, and the unit is MPa.
2. The aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable according to claim 1, wherein the overlapping rate of wrapping the semiconductive nylon belt outside the insulation shielding layer is m 2 And m is 2 =m 1 1- α; and the alpha is the eccentricity after the three layers of the conductor inner shielding layer and the insulating shielding layer are co-extruded, and the unit is%.
3. The aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable according to claim 1, wherein m is 1 Through the thickness correction of the conductor inner shielding layer and the insulation shielding layer, the specific formula is as follows: m is a unit of 1 =(1-a·S 1 /S 2 )·h 1 /h 2 Wherein h is 1 Is the thickness of the conductor inner shielding layer, and the unit is mm, h 2 Is the thickness of the insulating shield layer in mm.
4. The aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable according to claim 2, characterized in that the eccentricity α is less than or equal to 6%.
5. The aluminum alloy core crosslinked ethylene insulation low smoke zero halogen polyolefin sheath flame retardant power cable as claimed in claim 1, wherein the thickness of the conductor inner shielding layer is 0.8 to 1.0mm, the thickness of the insulation layer is 10.5 to 10.8mm, and the thickness of the insulation shielding layer is 0.8 to 1.0mm.
6. The aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable as claimed in claim 1, wherein the thickness of the semiconductive nylon tape is 0.06 to 0.1mm.
7. The aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable according to claim 1, characterized in that the copper wire shielding layer is shielded by copper wire in a sparse winding manner, the pitch diameter ratio is 10 to 12, and the average gap of the copper wire is less than or equal to 4mm.
8. The aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable according to claim 7, characterized in that a copper strip is reversely wrapped on the outer layer of the copper wire, and the shielding sectional area of the copper wire is 35-50mm 2 。
9. The process for preparing the aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheathed flame-retardant power cable according to any one of claims 2~8, comprising the following process steps:
s1, winding a semi-conductive nylon tape on the outer side of a conductor, and overlapping and wrapping the semi-conductive nylon tape on the surface of the conductor to obtain an inner shielding layer of the conductor;
s2, winding the semi-conductive nylon belt on the outer side of the insulation shielding layer;
s3, forming a cross-linked wire core by the conductor inner shielding layer, the insulating layer and the S2 insulating shielding layer in the step S1 in a three-layer co-extrusion mode;
s4, manufacturing the inner conductor obtained in the step S3 into a cable core by adopting a flame-retardant doubled PP (polypropylene) filling rope, wherein the out-of-roundness beta is less than or equal to 5~8 percent, and a glass fiber tape is wrapped on the outer side of the cable core;
and S5, sequentially wrapping the copper wire shielding layer, the armor and the outer sheath on the outer side of the cable core obtained in the step S4 to obtain the power cable.
10. The preparation process of the aluminum alloy core crosslinked ethylene insulated low-smoke halogen-free polyolefin sheath flame-retardant power cable according to claim 9, characterized in that the cover overlapping rate m of the glass fiber tape in the step S4 3 Calculated by the following formula: m is 3 =m 1 (1- α)/(1- β); wherein m is 1 The covering rate of the semi-conductive nylon belt wrapped outside the conductor is shown, alpha is the conductor inner shielding layer, the eccentricity of the three layers of the insulating layer and the insulating shielding layer after co-extrusion is shown in the unit of percent, beta is the out-of-roundness of the cable core, and the unit of percent is shown in the specification.
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| CN202210693374.0A CN114927270B (en) | 2022-06-17 | 2022-06-17 | Aluminum alloy core crosslinked ethylene insulation low-smoke halogen-free polyolefin sheath flame-retardant power cable and preparation process thereof |
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| JP2002175729A (en) * | 2000-12-08 | 2002-06-21 | Yoshinokawa Electric Wire & Cable Co Ltd | Cable with shield |
| CN204991173U (en) * | 2015-08-06 | 2016-01-20 | 新亚特电缆股份有限公司 | Electric Railway cable |
| CN107369503A (en) * | 2017-08-04 | 2017-11-21 | 远东电缆有限公司 | Wisdom energy wind-powered electricity generation light-duty fire-retardant midium voltage cable of environmentally friendly oil resistant and production technology |
| CN211858228U (en) * | 2020-04-15 | 2020-11-03 | 浙江万马股份有限公司 | Super gentle mica tape mineral insulated cable |
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