CN115497688A - Preparation method of 26/35kV and below environment-friendly polypropylene insulated power cable - Google Patents
Preparation method of 26/35kV and below environment-friendly polypropylene insulated power cable Download PDFInfo
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- CN115497688A CN115497688A CN202211160210.8A CN202211160210A CN115497688A CN 115497688 A CN115497688 A CN 115497688A CN 202211160210 A CN202211160210 A CN 202211160210A CN 115497688 A CN115497688 A CN 115497688A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
- H01B13/141—Insulating conductors or cables by extrusion of two or more insulating layers
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0016—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0036—Details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
- H01B13/143—Insulating conductors or cables by extrusion with a special opening of the extrusion head
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
- H01B13/145—Pretreatment or after-treatment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers by extrusion
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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)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a preparation method of an environment-friendly polypropylene insulated power cable with the voltage of 26/35kV and below, which comprises the following steps: the method comprises the steps of conductor wire drawing and stranding, PP insulation three-layer co-extrusion, copper strip shielding layer winding, cabling and wrapping, isolation sleeve extrusion, copper strip armoring, outer sheath extrusion and finished product inspection and warehousing, wherein the PP insulation three-layer co-extrusion step adopts three-layer co-extrusion of a modified polypropylene insulation material, a polypropylene conductor shielding material and a polypropylene insulation shielding material, a high-temperature oil type mold temperature machine is adopted by a three-layer co-extrusion machine head, the processing temperature of the three-layer co-extrusion machine head is controlled to be above 170 ℃, the taper angle of a mold core in the three-layer co-extrusion machine head is 60-66 degrees, the length of a shaping working face of the mold sleeve is 8-15 mm, and high-pressure nitrogen is adopted to protect the extruded polypropylene insulation wire core in a combined manner, so that the roundness of the polypropylene insulation wire core is controlled within 5%, and the eccentricity is controlled within 8%.
Description
Technical Field
The invention relates to the technical field of cable preparation, in particular to a preparation method of an environment-friendly polypropylene insulated power cable of 26/35kV or below.
Background
At present, medium voltage power cable insulation is based on crosslinked polyethylene as the main insulating material. Crosslinked polyethylene is a thermosetting material produced by cross-linking molecular chains of polyethylene into a three-dimensional network structure by a crosslinking means. Compared with polyethylene, XLPE has higher thermal property and mechanical property, and keeps the advantages of high insulation resistance, good electric resistance and small dielectric loss of polyethylene. However, with the large scale use of XLPE insulation, some problems are also exposed:
(1) Crosslinking byproducts generated in the XLPE crosslinking process can still remain in the cable after degassing, and the mechanical property and the electrical property of insulation are influenced;
(2) The production process is complex, the working procedures such as crosslinking, degassing and the like occupy large space, the energy consumption is high, and the production efficiency is low;
(3) The XLPE insulating material is a thermosetting material, and XLPE cables are difficult to recycle after being retired, so that wastes damage the environment.
Compared with the prior art, the polypropylene has good chemical corrosion resistance and electrical insulation, cross-linking and degassing treatment are not needed in the production process, pollution and energy consumption in the production process are reduced, and the polypropylene can be recycled, so that the requirements of environmental protection and low carbon are met. In addition, the heat deformation resistance of the polypropylene at higher temperature is better than that of crosslinked polyethylene, the overload resistance and the safety performance are better, and the polypropylene has good development prospect.
Although the polypropylene material has the advantages compared with the crosslinked polyethylene insulation, the polypropylene material still has some performance defects, and the main defect is that the crystallinity is high, so the melting point temperature and the processing temperature are higher than those of the crosslinked polyethylene insulation, the existing crosslinked polyethylene insulation production unit cannot meet the production requirement of the polypropylene insulation, the production process of the polypropylene insulation needs to be improved, the requirement of the polypropylene insulation on large-length continuous production is met, the innovation of the batch application of the novel cable insulation material is realized, the requirement of the green low-carbon cycle development of a power grid is met, and the polypropylene material has important significance for the development of power cables.
The technical problems to be solved by the invention are as follows:
(1) the processing temperature for producing the crosslinked polyethylene is 100-120 ℃, the crystallinity of the polypropylene material is high, the melting point temperature is above 170 ℃ and is far higher than the insulating processing temperature of the crosslinked polyethylene, and the existing three-layer co-extrusion unit cannot meet the production requirement at the temperature;
(2) the melt flow rate of the polypropylene material is different from that of the polyethylene material, the melt flow rate is low, the melt viscosity is high, and the molding processing fluidity is poor; on the contrary, the molding processing fluidity is good. The problems of controlling the roundness and the eccentricity of the extruded polypropylene need to be solved;
(3) the polypropylene material has the defects of poor low-temperature impact property and poor flexibility, and the material needs to be modified for improving the material performance, and the processing temperature of the modified polypropylene material applied to a cable product does not have reference data at present;
disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of an environment-friendly polypropylene insulated power cable of 26/35kV or below aiming at the defects of the existing environment-friendly polypropylene insulated power cable.
In order to realize the aim, the preparation method of the environment-friendly polypropylene insulated power cable with the voltage of 26/35kV and the following steps sequentially comprises the following steps: the method comprises the steps of conductor drawing and stranding, PP insulation three-layer co-extrusion, copper strip shielding layer winding, cabling and wrapping, isolation sleeve extrusion, copper strip armoring, outer sheath extrusion, finished product inspection and product warehousing, wherein the PP insulation three-layer co-extrusion step adopts three-layer co-extrusion of a modified polypropylene insulation material, a polypropylene conductor shielding material and a polypropylene insulation shielding material, a three-layer co-extrusion machine head adopts a high-temperature oil type mold temperature machine, the processing temperature of the three-layer co-extrusion machine head is controlled to be above 170 ℃, the high-temperature oil type mold temperature machine and the three-layer co-extrusion machine head are connected through a 304 stainless steel metal high-temperature hose, a heat insulation rock wool pipe and heat insulation wool are adopted outside the 304 stainless steel metal high-temperature hose for heat insulation, the outlet temperature of the high-temperature oil type mold temperature machine and the processing temperature of the three-layer co-extrusion machine head are within +/-5 ℃, the taper angle of a mold core in the three-layer co-extrusion machine head is 60-66 degrees, and the length of a mold sleeve shaping working surface is 8-15 mm; in the PP insulation three-layer co-extrusion step, high-pressure nitrogen is adopted to protect the extruded polypropylene insulation wire core, so that the roundness of the polypropylene insulation wire core is controlled within 5%, and the eccentricity is controlled within 8%.
Due to the adoption of the technical scheme, the invention solves the following technical problems:
(1) the three-layer co-extrusion machine head of the CCV catenary production line is modified, the heating mode of the machine head is changed, the original water type mold temperature machine is changed into a high-temperature oil type mold temperature machine, the heating range is increased, and the processing temperature requirements of a modified polypropylene insulating material, a polypropylene conductor shielding material and a polypropylene insulating shielding material are met;
(2) the connecting pipeline between the oil type mold temperature machine and the machine head is improved, a 304 stainless steel metal high-temperature hose is adopted for connection, a heat-preservation rock wool pipe and heat-preservation wool are adopted outside the hose, the difference between the output temperature of the mold temperature machine and the processing temperature of the machine head is controlled within 5 ℃, the processing temperature is constant, and large-range fluctuation is avoided;
(3) redesigning the polypropylene material processing extrusion die, modifying the inclination angle of the die core and the length of the working surface of the die sleeve shaping section, enabling the material fluidity to be more stable, and ensuring the roundness of the polypropylene insulation wire core, thereby ensuring that the eccentricity of the product meets the quality requirement.
(4) In the production process, a vulcanizing pipe is not needed for heating, but high-pressure nitrogen is applied to the polypropylene insulated wire core to keep water-gas balance, so that the roundness of the polypropylene insulated wire core is ensured, and the eccentricity of a product is ensured to meet the quality requirement;
(5) the optimum processing production temperature which meets the material is finally designed by searching the extrusion plasticizing condition of the modified polypropylene insulating material on an extruding machine and the melt fluidity test, and the requirement of the polypropylene insulating long-length continuous production is met.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
The invention is further described below in conjunction with the appended drawings and the detailed description.
Referring to fig. 1, the preparation method of the environment-friendly polypropylene insulated power cable with 26/35kV and the following steps sequentially comprises the following steps: the method comprises the steps of conductor wire drawing and stranding, PP insulation three-layer co-extrusion, copper strip shielding layer winding, cabling and wrapping, isolation sleeve extrusion, copper strip armoring, outer sheath extrusion, finished product inspection and product warehousing, wherein:
the PP insulation three-layer co-extrusion step adopts three-layer co-extrusion of a modified polypropylene insulation material, a polypropylene conductor shielding material and a polypropylene insulation shielding material.
The three-layer co-extrusion machine head adopts a high-temperature oil type mold temperature machine, and the processing temperature of the three-layer co-extrusion machine head is controlled to be more than 170 ℃.
The high-temperature oil type die temperature machine and the three-layer co-extrusion machine head are connected through a 304 stainless steel metal high-temperature hose, and a heat-preservation rock wool pipe and heat-preservation wool are adopted outside the 304 stainless steel metal high-temperature hose for heat preservation, so that the outlet temperature of the high-temperature oil type die temperature machine and the processing temperature of the three-layer co-extrusion machine head are within +/-5 ℃.
The taper angle of the mold core in the three-layer co-extrusion machine head is 60-66 degrees, the length of the shaping working surface of the mold sleeve is 8-15 mm, and the extruded polypropylene insulated wire core is protected by adopting high-pressure nitrogen, so that the roundness of the polypropylene insulated wire core is controlled within 5 percent, and the eccentricity is controlled within 8 percent.
Claims (1)
1. A preparation method of an environment-friendly polypropylene insulated power cable with 26/35kV and below sequentially comprises the following steps: the method comprises the steps of conductor wire drawing and stranding, PP insulation three-layer co-extrusion, copper strip shielding layer winding, cabling and wrapping, isolation sleeve extrusion, copper strip armoring, outer sheath extrusion, finished product inspection and product warehousing, and is characterized in that the PP insulation three-layer co-extrusion step adopts three-layer co-extrusion of a modified polypropylene insulation material, a polypropylene conductor shielding material and a polypropylene insulation shielding material, wherein a high-temperature oil type mold temperature machine is adopted for a three-layer co-extrusion machine head, the processing temperature of the three-layer co-extrusion machine head is controlled to be above 170 ℃, the high-temperature oil type mold temperature machine and the three-layer co-extrusion machine head are connected through a 304 stainless steel metal high-temperature hose, a heat insulation rock wool pipe and heat insulation wool are adopted outside the 304 stainless steel metal high-temperature hose for heat insulation, the outlet temperature of the high-temperature oil type mold temperature machine and the processing temperature of the three-layer co-extrusion machine head are within +/-5 ℃, the taper angle of a mold core in the three-layer co-extrusion machine head is 60-66 degrees to 66 degrees, and the length of a mold sleeve shaping working surface is 8-15 mm; in the PP insulation three-layer co-extrusion step, high-pressure nitrogen is adopted to protect the extruded polypropylene insulation wire core, so that the roundness of the polypropylene insulation wire core is controlled within 5%, and the eccentricity is controlled within 8%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211160210.8A CN115497688A (en) | 2022-09-22 | 2022-09-22 | Preparation method of 26/35kV and below environment-friendly polypropylene insulated power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211160210.8A CN115497688A (en) | 2022-09-22 | 2022-09-22 | Preparation method of 26/35kV and below environment-friendly polypropylene insulated power cable |
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| Publication Number | Publication Date |
|---|---|
| CN115497688A true CN115497688A (en) | 2022-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211160210.8A Withdrawn CN115497688A (en) | 2022-09-22 | 2022-09-22 | Preparation method of 26/35kV and below environment-friendly polypropylene insulated power cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115497688A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116705427A (en) * | 2023-06-06 | 2023-09-05 | 广州南洋电缆集团有限公司 | Polypropylene cable intelligent manufacturing system |
-
2022
- 2022-09-22 CN CN202211160210.8A patent/CN115497688A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116705427A (en) * | 2023-06-06 | 2023-09-05 | 广州南洋电缆集团有限公司 | Polypropylene cable intelligent manufacturing system |
| CN116705427B (en) * | 2023-06-06 | 2023-12-26 | 广州南洋电缆集团有限公司 | Polypropylene cable intelligent manufacturing system |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20221220 |
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| WW01 | Invention patent application withdrawn after publication |