CN114388192B - High-quality medium-voltage crosslinked cable insulation wire core and preparation method thereof - Google Patents
High-quality medium-voltage crosslinked cable insulation wire core and preparation method thereof Download PDFInfo
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- CN114388192B CN114388192B CN202011139188.XA CN202011139188A CN114388192B CN 114388192 B CN114388192 B CN 114388192B CN 202011139188 A CN202011139188 A CN 202011139188A CN 114388192 B CN114388192 B CN 114388192B
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- 238000009413 insulation Methods 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000004020 conductor Substances 0.000 claims abstract description 133
- 239000000463 material Substances 0.000 claims abstract description 69
- 239000011159 matrix material Substances 0.000 claims abstract description 65
- 238000004132 cross linking Methods 0.000 claims description 54
- 238000000034 method Methods 0.000 claims description 20
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 16
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 16
- 239000011810 insulating material Substances 0.000 claims description 16
- 238000001125 extrusion Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 238000007493 shaping process Methods 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 230000003749 cleanliness Effects 0.000 abstract description 9
- 238000009826 distribution Methods 0.000 abstract description 5
- 230000015556 catabolic process Effects 0.000 abstract description 4
- 230000005684 electric field Effects 0.000 description 13
- 239000000758 substrate Substances 0.000 description 6
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/006—Constructional features relating to the conductors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers by extrusion
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- 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
- H01B9/021—Features relating to screening tape per se
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/04—Concentric cables
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- 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)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides a high-quality medium-voltage crosslinked cable insulation wire core and a preparation method thereof, and relates to the technical field of power cables. The invention provides a high-quality medium-voltage crosslinked cable insulation wire core, which comprises a conductor matrix, and a conductor shielding layer, an insulation layer and an insulation shielding layer which are sequentially coated on the surface of the conductor matrix from inside to outside. The special-shaped stranded conductor is adopted, so that the interface protrusion or depression between the conductor shielding layer and the insulating layer, which is caused by embedding the conductor shielding layer into the conductor, can be reduced; the ultra-smooth semi-conductive shielding material with smaller granularity and higher cleanliness is selected as the conductor shielding layer and the insulating shielding layer, so that interface bulges and gaps caused by larger granularity and poorer cleanliness of the semi-conductive shielding material can be avoided. The invention solves the problems of cable breakdown caused by large partial discharge and uneven field intensity distribution of the cable due to the protrusion, the recess and the interface gap by limiting the structure and the components of the cable, and prolongs the service life of the cable.
Description
Technical Field
The invention relates to the technical field of power cables, in particular to a high-quality medium-voltage crosslinked cable insulation wire core and a preparation method thereof.
Background
At present, most of domestic manufacturers generally use a compressed circular stranded conductor in the production process of a medium-voltage cable, the filling coefficient of the compressed conductor is relatively improved (generally between 0.88 and 0.92), a larger gap still exists, the edge angle of an outer conductor is still obvious, in the cross-linking insulation extrusion process, because insulation is wrapped on the conductor and is in a hot melting state, under the conditions of high temperature and high pressure (about 1.0 MPa) of a cross-linking pipeline, the conductor shielding can be inlaid in the conductor, the interface between the conductor shielding and an insulating layer is raised and recessed, tip discharge can be generated in the use process of the cable, and the service life of the cable is reduced.
In terms of materials of insulating layers, the granularity and cleanliness of various components in insulating shielding materials adopted by the existing medium-voltage cable are different, particularly, the use of semiconductive materials with larger granularity, carbon black and poorer cleanliness is difficult to detect when the cable leaves a factory for inspection, but in the long-term use process of the cable, uneven field intensity distribution can be caused due to interface bulges, interface gaps and the like generated by the cable; in addition, the electric field distortion is serious in the use process of the electric field due to the overlarge eccentricity of the cable, so that the service life of the cable is influenced.
Disclosure of Invention
The invention aims to provide a high-quality medium-voltage crosslinked cable insulation wire core and a preparation method thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a high-quality medium-voltage crosslinked cable insulation wire core, which comprises a conductor matrix, and a conductor shielding layer, an insulation layer and an insulation shielding layer which are sequentially coated on the surface of the conductor matrix from inside to outside, wherein the conductor matrix is a special-shaped stranded conductor, and the conductor matrix is made of copper; the conductor shielding layer is made of ultra-smooth semi-conductive conductor shielding materials; the insulating layer is made of crosslinked polyethylene insulating materials, and the insulating shielding layer is made of ultra-smooth semi-conductive insulating shielding materials.
Preferably, the filling coefficient of the conductive matrix is greater than 0.96, and the surface of the conductive matrix is smooth.
Preferably, the diameter of the conductive substrate is 7.0-24.0 mm.
Preferably, the thickness of the conductor shielding layer is 0.6-0.9 mm.
Preferably, the thickness of the insulating layer is 2.5-10.5 mm.
Preferably, the thickness of the insulating shielding layer is 0.6-0.8 mm.
The invention provides a preparation method of the high-quality medium-voltage crosslinked cable insulation wire core, which comprises the following steps:
placing a conductor matrix in an extruder, overlapping and coating an ultra-smooth semi-conductive conductor shielding material, a crosslinked polyethylene insulating material and an ultra-smooth semi-conductive insulating shielding material on the surface of the conductor matrix layer by layer in a concentric circle mode when the conductor matrix passes through a head die of the extruder, and completing crosslinking, cooling and shaping in a crosslinked pipe to obtain an insulating wire core with a conductor shielding layer, an insulating layer and an insulating shielding layer sequentially coated on the surface of the conductor matrix;
and twisting the insulated wire core by using a wire twisting device in the insulation extrusion process, so that the insulated wire core is in a rotating state before incomplete crosslinking in the whole production process, and the eccentricity of the insulating layer is controlled within 8%, thus obtaining the high-quality medium-voltage crosslinked cable insulated wire core.
Preferably, the cross-linking tube comprises a plurality of sections of cross-linking tubes, the temperature of the first section of cross-linking tube is 200 ℃, and the temperature of a plurality of sections of cross-linking tubes after the first section is 300-350 ℃; the time for crosslinking in the crosslinking tube is 4.0-20.0 min.
The invention provides a high-quality medium-voltage crosslinked cable insulation wire core, which comprises a conductor matrix, and a conductor shielding layer, an insulation layer and an insulation shielding layer which are sequentially coated on the surface of the conductor matrix from inside to outside, wherein the conductor matrix is a special-shaped stranded conductor, and the conductor matrix is made of copper; the conductor shielding layer is made of ultra-smooth semi-conductive conductor shielding materials; the insulating layer is made of crosslinked polyethylene insulating materials, and the insulating shielding layer is made of ultra-smooth semi-conductive insulating shielding materials. The special-shaped stranded conductor is adopted, so that the filling coefficient and the surface smoothness of the conductor can be increased, and the interface protrusion or depression between the conductor shielding layer and the insulating layer caused by embedding the conductor shielding layer into the conductor can be reduced; the ultra-smooth semi-conductive shielding material with smaller granularity and higher cleanliness is selected as the conductor shielding layer and the insulating shielding layer, so that interface bulges and gaps caused by larger granularity and poorer cleanliness of the semi-conductive shielding material can be avoided. The invention solves the problems of cable breakdown caused by large partial discharge amount and uneven field intensity distribution of the cable due to the protrusion, the recess and the interface gap by limiting the cable structure and the components, prolongs the service life of the cable, and improves and stabilizes the quality of the cable.
Drawings
FIG. 1 is a comparative view of a prior art conductor substrate and a conductor substrate of the present invention;
FIG. 2 is a pictorial view of the insulated wire core of the high quality medium voltage crosslinked cable of the present invention;
FIG. 3 is a schematic view of a wire scrubber; wherein 1 is a wire twisting device belt, 2 is a wire twisting device roller, and 3 is an insulating wire core.
Detailed Description
The invention provides a high-quality medium-voltage crosslinked cable insulation wire core, which comprises a conductor matrix, and a conductor shielding layer, an insulation layer and an insulation shielding layer which are sequentially coated on the surface of the conductor matrix from inside to outside, wherein the conductor matrix is a special-shaped stranded conductor, and the conductor matrix is made of copper; the conductor shielding layer is made of ultra-smooth semi-conductive conductor shielding materials; the insulating layer is made of crosslinked polyethylene insulating materials, and the insulating shielding layer is made of ultra-smooth semi-conductive insulating shielding materials.
The high-quality medium-voltage crosslinked cable insulation wire core provided by the invention comprises a conductor matrix. In the invention, the conductive matrix is a special-shaped stranded conductor, and the specific structure is shown on the right side in fig. 1 and in fig. 2. In the invention, the conductive matrix comprises a central cylindrical rod material and a plurality of trapezoid rod materials surrounding the central, wherein the trapezoid rod materials form a circular ring by twisting the central cylindrical rod material, and 2-4 layers of circular rings are outwards formed by the central cylindrical rod material. In the invention, the cylindrical rod material is preferably copper; the diameter of the cylindrical rod is preferably 1.5-3.0 mm. In the invention, the trapezoid bar material is preferably copper; the height of the trapezoid bar is preferably 2.0-2.5 mm. In the present invention, the conductor base preferably has a diameter of 7.0 to 24.0mm. The conductor substrate with the size can increase the filling coefficient, and the outer surface of the conductor is approximately smooth and round.
In the present invention, the filling factor of the conductive substrate is preferably greater than 0.96, more preferably 0.96 to 0.98, and the conductive substrate has a smooth surface, which can reduce the interface protrusion or depression between the conductor shielding layer and the insulating layer caused by embedding the conductor shielding layer inside the conductor, compared to the compressed circular conductor (as shown in the left side of fig. 1) of the prior art.
The high-quality medium-voltage crosslinked cable insulation wire core provided by the invention comprises the conductor shielding layer coated on the surface of the conductor matrix, so that the electric field can be homogenized, and the electric field concentration of the insulation layer is prevented. In the invention, the composition of the conductor shielding layer is ultra-smooth semi-conductive conductor shielding material, and the thickness is preferably 0.6-0.9 mm.
The high-quality medium-voltage crosslinked cable insulation wire core provided by the invention comprises an insulation layer coated on the outer surface of the conductor shielding layer, and the insulation layer is used for electrical insulation. In the invention, the insulating layer is made of crosslinked polyethylene insulating material, and the thickness is preferably 2.5-10.5 mm.
The high-quality medium-voltage crosslinked cable insulation wire core provided by the invention comprises the insulation shielding layer coated on the surface of the insulation layer, so that the electric field can be homogenized, and the electric field concentration of the insulation layer is prevented. In the invention, the insulating shielding layer is made of ultra-smooth semi-conductive insulating shielding material, and the thickness is preferably 0.6-0.8 mm.
The ultra-smooth semi-conductive shielding material with smaller granularity and higher cleanliness is selected as the conductor shielding layer and the insulating shielding layer, so that interface bulges and gaps caused by larger granularity and poorer cleanliness of the semi-conductive shielding material can be avoided.
The invention also provides a preparation method of the high-quality medium-voltage crosslinked cable insulation wire core, which comprises the following steps:
placing a conductor matrix in an extruder, overlapping and coating an ultra-smooth semi-conductive conductor shielding material, a crosslinked polyethylene insulating material and an ultra-smooth semi-conductive insulating shielding material on the surface of the conductor matrix layer by layer in a concentric circle mode when the conductor matrix passes through a head die of the extruder, and completing crosslinking, cooling and shaping in a crosslinked pipe to obtain an insulating wire core with a conductor shielding layer, an insulating layer and an insulating shielding layer sequentially coated on the surface of the conductor matrix;
and twisting the insulated wire core by using a wire twisting device in the insulation extrusion process, so that the insulated wire core is in a rotating state before incomplete crosslinking in the whole production process, and the eccentricity of the insulating layer is controlled within 8%, thus obtaining the high-quality medium-voltage crosslinked cable insulated wire core.
According to the invention, in the preparation process, the insulation eccentricity is controlled within 8% (within 15% required by national standard) by changing the temperature of the cross-linking tube and twisting the insulation wire core by using the wire twisting device, so that the electric field distortion caused by the insulation eccentricity is reduced.
When the conductor matrix passes through a head die of the extruder, the ultra-smooth semi-conductive conductor shielding material, the crosslinked polyethylene insulating material and the ultra-smooth semi-conductive insulating shielding material are overlapped and coated on the surface of the conductor matrix layer by layer in a concentric circle mode, and the crosslinking and cooling shaping are completed in the crosslinked pipe, so that an insulating wire core with a conductor shielding layer, an insulating layer and an insulating shielding layer coated on the surface of the conductor matrix in sequence is obtained.
In the present invention, the cross-linking tube preferably comprises a multi-stage cross-linking tube, the temperature of the first stage cross-linking tube is preferably 200 ℃, and the temperatures of several stages of cross-linking tubes after the first stage are preferably 300-350 ℃; the time for crosslinking in the crosslinking tube is preferably 4.0 to 20.0 minutes, more preferably 6.3 to 18.6 minutes, and still more preferably 13.5 minutes.
The specific process steps of the layer-by-layer superposition coating are not particularly required, and the process known by the person skilled in the art can be adopted.
In the present invention, the cooling and shaping medium is preferably warm water.
By adopting the extrusion mode, the problems of uneven field intensity distribution, larger local discharge capacity and the like at the interface joint due to interface gaps can be avoided.
According to the invention, the insulated wire core is twisted by the wire twisting device in the insulation extrusion process, so that the insulated wire core is in a rotating state before incomplete crosslinking in the whole production process, and the eccentricity of the insulating layer is controlled within 8%, so that the high-quality medium-voltage crosslinked cable insulated wire core is obtained.
In the present invention, the twisting is performed in a twisting machine as shown in fig. 3. In a specific embodiment of the invention, the insulated wire core is placed between the wire twisting belts, and the wire twisting rollers in the wire twisting belts are utilized to twist the insulated wire core. In the invention, the rotation angle of the twisting is preferably 10-15 degrees before the conductor enters the machine head.
In the prior art, as the insulating extrusion of the medium-voltage crosslinked cable basically adopts a suspension chain production mode, the insulating layer is still in an uncrosslinked molten state when being just extruded onto a conductor, and can fall under the action of self gravity, so that the insulation eccentricity is overlarge. The eccentricity of the insulating layer of the medium-voltage cable can lead to distortion of an electric field in the use process of the cable, the larger the eccentricity is, the more serious the distortion of the electric field is, the distortion of the electric field leads to serious uneven electric field force born by the insulating layer, and the serious insulation damage is caused at the place with large electric field strength in the long-term use process, so that the cable breakdown is finally caused, and the service life of the cable is shortened. The temperature of the crosslinking tube in the crosslinking production line is generally set to about 350-390 ℃, and the insulating layer in a molten state at a high temperature cannot realize instant crosslinking, so that the dropping situation is aggravated by the excessively high temperature. The invention reduces the temperature of the first section of the cross-linking pipe to 200 ℃ (the temperature of other sections is between 300 and 350 ℃), and simultaneously uses the wire twisting device to twist the wire core after the insulated wire core is out of the cross-linking pipe, so that the wire core is always in a rotating state in the process of extruding to cooling completion, thereby solving the problem of overlarge eccentricity caused by falling of the insulating layer.
The invention solves the problem of interface protrusion or depression caused by embedding the conductor shielding layer into the conductor matrix by improving the filling coefficient of the conductor matrix and increasing the surface smoothness of the conductor matrix; the problems of interface gaps or bulges caused by overlarge granularity and low cleanliness of material components are reduced by using an ultra-smooth shielding material (an ultra-smooth semi-conductive semiconductor shielding material and an ultra-smooth semi-conductive insulating shielding material); the problem of overlarge insulation eccentricity is solved by changing the process control method. The cable breakdown caused by large partial discharge quantity and uneven field intensity distribution of the cable due to the protrusion, the recess and the interface clearance is well solved through the change of the three aspects, meanwhile, the insulation eccentricity is controlled within 8% through changing the process control method, the electric field distortion in the insulation layer is reduced, the service life of the cable is prolonged, and the quality of the cable is improved and stabilized.
The technical solutions of the present invention will be clearly and completely described in the following in connection with the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The material of the conductor matrix in the following embodiment is copper;
the components of the conductor shielding layer and the insulating shielding layer are ultra-smooth semi-conductive shielding materials.
Example 1
In the embodiment, the conductive matrix is composed of a central cylindrical rod material and a plurality of trapezoidal rod materials surrounding the central, wherein the plurality of trapezoidal rod materials form a circular ring by twisting the central cylindrical rod material, and 2 layers of circular rings are outwards formed by the central cylindrical rod material;
placing the conductor matrix in an extruder, and overlapping and coating an ultra-smooth semi-conductive conductor shielding material, a crosslinked polyethylene insulating material and an ultra-smooth semi-conductive insulating shielding material on the surface of the conductor matrix layer by layer in a concentric circle mode when the conductor matrix passes through a head die of the extruder; the obtained insulated wire core is crosslinked in a high-temperature and high-pressure crosslinking tube for 6.3min, wherein the crosslinking tube comprises a plurality of sections of crosslinking tubes, the temperature of the first section of crosslinking tube is 200 ℃, and the temperature of a plurality of sections of crosslinking tubes is 300-350 ℃; and then obtaining an insulated wire core after cooling and shaping, twisting the insulated wire core by using a wire twisting device in the insulation extrusion process, and controlling the insulation eccentricity of the insulated wire core to be within 8%, so that the insulated wire core is in a rotating state before incomplete crosslinking in the whole production process, and the eccentric degree is prevented from being too large due to insulation falling in a hot melting state, thereby obtaining the high-quality medium-voltage crosslinked cable insulated wire core.
The diameter of the conductor matrix of the high-quality medium-voltage crosslinked cable insulated wire core is 11.0mm, the thickness of the conductor shielding layer formed by the ultra-smooth semi-conductive conductor shielding material is 0.8mm, the thickness of the insulating layer formed by the crosslinked polyethylene insulating material is 4.5mm, and the thickness of the insulating shielding layer formed by the ultra-smooth semi-conductive insulating shielding material is 0.7mm.
The high-quality medium-voltage crosslinked cable insulation core prepared by the embodiment does not find any discharge in partial discharge detection.
Example 2
In the embodiment, the conductive matrix is composed of a central cylindrical rod material and a plurality of trapezoidal rod materials surrounding the central, wherein the trapezoidal rod materials form a circular ring by twisting the central cylindrical rod material, and 3 layers of circular rings are outwards formed by the central cylindrical rod material;
placing the conductor matrix in an extruder, and overlapping and coating an ultra-smooth semi-conductive conductor shielding material, a crosslinked polyethylene insulating material and an ultra-smooth semi-conductive insulating shielding material on the surface of the conductor matrix layer by layer in a concentric circle mode when the conductor matrix passes through a head die of the extruder; the obtained insulated wire core is crosslinked in a high-temperature and high-pressure crosslinking tube for 13.5min, wherein the crosslinking tube comprises a plurality of sections of crosslinking tubes, the temperature of the first section of crosslinking tube is 200 ℃, and the temperature of a plurality of sections of crosslinking tubes is 300-350 ℃; and then obtaining an insulated wire core after cooling and shaping, twisting the insulated wire core by using a wire twisting device in the insulation extrusion process, and controlling the insulation eccentricity of the insulated wire core to be within 8%, so that the insulated wire core is in a rotating state before incomplete crosslinking in the whole production process, and the eccentric degree is prevented from being too large due to insulation falling in a hot melting state, thereby obtaining the high-quality medium-voltage crosslinked cable insulated wire core.
The diameter of the conductor matrix of the high-quality medium-voltage crosslinked cable insulated wire core is 15.5mm, the thickness of the conductor shielding layer formed by the ultra-smooth semi-conductive conductor shielding material is 0.8mm, the thickness of the insulating layer formed by the crosslinked polyethylene insulating material is 10.5mm, and the thickness of the insulating shielding layer formed by the ultra-smooth semi-conductive insulating shielding material is 0.8mm.
The high-quality medium-voltage crosslinked cable insulation core prepared in the embodiment does not find any discharge in partial discharge detection.
Example 3
In the embodiment, the conductive matrix is composed of a central cylindrical rod material and a plurality of trapezoidal rod materials surrounding the central, wherein the trapezoidal rod materials form a circular ring by twisting the central cylindrical rod material, and 4 layers of circular rings are outwards formed by the central cylindrical rod material;
placing the conductor matrix in an extruder, and overlapping and coating an ultra-smooth semi-conductive conductor shielding material, a crosslinked polyethylene insulating material and an ultra-smooth semi-conductive insulating shielding material on the surface of the conductor matrix layer by layer in a concentric circle mode when the conductor matrix passes through a head die of the extruder; the obtained insulated wire core is crosslinked in a high-temperature and high-pressure crosslinking tube for 18.6min, wherein the crosslinking tube comprises a plurality of sections of crosslinking tubes, the temperature of the first section of crosslinking tube is 200 ℃, and the temperature of a plurality of sections of crosslinking tubes is 300-350 ℃; and then obtaining an insulated wire core after cooling and shaping, twisting the insulated wire core by using a wire twisting device in the insulation extrusion process, and controlling the insulation eccentricity of the insulated wire core to be within 8%, so that the insulated wire core is in a rotating state before incomplete crosslinking in the whole production process, and the eccentric degree is prevented from being too large due to insulation falling in a hot melting state, thus obtaining a high-quality medium-voltage crosslinked cable insulated wire core, and a high-quality medium-voltage crosslinked cable insulated wire core.
The diameter of the conductor matrix of the high-quality medium-voltage crosslinked cable insulated wire core is 22.5mm, the thickness of the conductor shielding layer formed by the ultra-smooth semi-conductive conductor shielding material is 0.8mm, the thickness of the insulating layer formed by the crosslinked polyethylene insulating material is 10.5mm, and the thickness of the insulating shielding layer formed by the ultra-smooth semi-conductive insulating shielding material is 0.7mm.
The high-quality medium-voltage crosslinked cable insulation core prepared in the embodiment does not find any discharge in partial discharge detection.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (6)
1. The high-quality medium-voltage crosslinked cable insulation wire core comprises a conductor matrix, and a conductor shielding layer, an insulation layer and an insulation shielding layer which are sequentially coated on the surface of the conductor matrix from inside to outside, and is characterized in that the conductor matrix is a special-shaped stranded conductor, and the conductor matrix is made of copper; the conductor shielding layer is made of ultra-smooth semi-conductive conductor shielding materials; the insulating layer is made of crosslinked polyethylene insulating materials, and the insulating shielding layer is made of ultra-smooth semiconductive insulating shielding materials; the filling coefficient of the conductor matrix is larger than 0.96, and the surface of the conductor matrix is smooth;
the preparation method of the high-quality medium-voltage crosslinked cable insulation wire core comprises the following steps:
placing a conductor matrix in an extruder, overlapping and coating an ultra-smooth semi-conductive conductor shielding material, a crosslinked polyethylene insulating material and an ultra-smooth semi-conductive insulating shielding material on the surface of the conductor matrix layer by layer in a concentric circle mode when the conductor matrix passes through a head die of the extruder, and completing crosslinking, cooling and shaping in a crosslinked pipe to obtain an insulating wire core with a conductor shielding layer, an insulating layer and an insulating shielding layer sequentially coated on the surface of the conductor matrix;
twisting the insulated wire core by using a wire twisting device in the insulation extrusion process, so that the insulated wire core is in a rotating state before incomplete crosslinking in the whole production process, and the eccentricity of an insulating layer is controlled within 8%, thus obtaining the high-quality medium-voltage crosslinked cable insulated wire core;
the cross-linking pipes comprise a plurality of sections of cross-linking pipes, the temperature of the first section of cross-linking pipes is 200 ℃, and the temperatures of a plurality of sections of cross-linking pipes after the first section are 300-350 ℃; the time for crosslinking in the crosslinking tube is 4.0-20.0 min.
2. The high quality medium voltage crosslinked cable insulation core of claim 1 wherein the conductor matrix has a diameter of 7.0-24.0 mm.
3. The high-quality medium voltage crosslinked cable insulation core according to claim 1, wherein the thickness of the conductor shielding layer is 0.6-0.9 mm.
4. The high-quality medium voltage crosslinked cable insulation core according to claim 1, wherein the thickness of the insulation layer is 2.5-10.5 mm.
5. The high-quality medium voltage crosslinked cable insulation core according to claim 1, wherein the thickness of the insulation shielding layer is 0.6-0.8 mm.
6. The method for preparing the high-quality medium-voltage crosslinked cable insulation core according to any one of claims 1-5, comprising the following steps:
placing a conductor matrix in an extruder, overlapping and coating an ultra-smooth semi-conductive conductor shielding material, a crosslinked polyethylene insulating material and an ultra-smooth semi-conductive insulating shielding material on the surface of the conductor matrix layer by layer in a concentric circle mode when the conductor matrix passes through a head die of the extruder, and completing crosslinking, cooling and shaping in a crosslinked pipe to obtain an insulating wire core with a conductor shielding layer, an insulating layer and an insulating shielding layer sequentially coated on the surface of the conductor matrix;
and twisting the insulated wire core by using a wire twisting device in the insulation extrusion process, so that the insulated wire core is in a rotating state before incomplete crosslinking in the whole production process, and the eccentricity of the insulating layer is controlled within 8%, thus obtaining the high-quality medium-voltage crosslinked cable insulated wire core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011139188.XA CN114388192B (en) | 2020-10-22 | 2020-10-22 | High-quality medium-voltage crosslinked cable insulation wire core and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011139188.XA CN114388192B (en) | 2020-10-22 | 2020-10-22 | High-quality medium-voltage crosslinked cable insulation wire core and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN114388192A CN114388192A (en) | 2022-04-22 |
| CN114388192B true CN114388192B (en) | 2023-12-15 |
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| CN118053630B (en) * | 2024-04-03 | 2024-11-15 | 广东新亚光电缆股份有限公司 | Method for preventing inner screen from sinking for medium-voltage crosslinked cable |
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