CN116779252A - Method for improving mechanical properties of electric insulation layer of medium-voltage crosslinked cable - Google Patents
Method for improving mechanical properties of electric insulation layer of medium-voltage crosslinked cable Download PDFInfo
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- CN116779252A CN116779252A CN202310698941.6A CN202310698941A CN116779252A CN 116779252 A CN116779252 A CN 116779252A CN 202310698941 A CN202310698941 A CN 202310698941A CN 116779252 A CN116779252 A CN 116779252A
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- section
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- cable
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000009413 insulation Methods 0.000 title abstract description 7
- 238000004132 cross linking Methods 0.000 claims abstract description 63
- 238000004519 manufacturing process Methods 0.000 claims abstract description 35
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 238000001125 extrusion Methods 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims description 28
- 239000011810 insulating material Substances 0.000 claims description 4
- 239000012774 insulation material Substances 0.000 abstract description 5
- 230000032683 aging Effects 0.000 description 9
- 230000008859 change Effects 0.000 description 8
- 238000010292 electrical insulation Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229920003020 cross-linked polyethylene Polymers 0.000 description 3
- 239000004703 cross-linked polyethylene Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
- H01B13/145—Pretreatment or after-treatment
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Organic Insulating Materials (AREA)
Abstract
The invention provides a method for improving the mechanical property of an electric insulating layer of a medium-voltage crosslinked cable, and relates to the technical field of medium-voltage crosslinked cable production processes. Under the condition of keeping the extrusion speed of the electric insulation material unchanged, closing the heating of the section 1-2 positioned at the tail end of the crosslinking section, and producing the medium-voltage crosslinked cable electric insulation layer according to the original production conditions. The invention closes the heating of the section 1-2 positioned at the tail end of the crosslinking section, which is equivalent to reducing the crosslinking section and increasing the precooling section.
Description
Technical Field
The invention relates to the technical field of medium-voltage crosslinked cable production processes, in particular to a method for improving the mechanical properties of an electric insulating layer of a medium-voltage crosslinked cable.
Background
The current production mode of the medium-voltage crosslinked cable electrical insulation layer is as follows: the electric insulation material is coated on the metal conductor through a three-layer co-extrusion machine head shown in fig. 1 after being heated and melted, then the cross-linking process of the electric insulation material is completed through a cross-linking section, then the electric insulation material enters a pre-cooling section for transitional cooling of an electric insulation layer, finally the electric insulation material enters a cooling section for cooling and shaping, and finally a coil is wound for next working procedure processing. At present, the production of the medium-voltage crosslinked cable electrical insulation layer of a cable manufacturer adopts the mode, and the difference is only that the lengths of a crosslinking section and a cooling section are different, and the layout modes of the crosslinking section and a pre-cooling section of equipment are as follows: 6+2, 7+2 or 9+2. The initial stage of the production of the medium-voltage crosslinked cable adopts a 6-section+2-section layout mode, and then the layout mode of the crosslinking equipment is changed into 7-section+2-section or 9-section+2-section due to the problem of improving the production efficiency.
Along with the increase of the length of the crosslinked pipe section, although the production speed in the extrusion process is improved, the production efficiency is improved, because the crosslinking equipment of the crosslinking heating section is provided with a precooling section of 2 sections (the length of each section of the crosslinking section and the cooling section is 6 m) no matter of 7 sections or 9 sections, the production speed is improved according to the different degrees of the length ratio of the crosslinked pipe under the condition that the crosslinking degree of the crosslinked cable insulating layer in the middle pressure is ensured to meet the national standard requirement in the cable insulating production process, and the crosslinking degree of the electrical insulating layer in the cable production process is further caused to meet the national standard requirement, but the exceeding of the mechanical performance index (the change rate of the insulating tensile strength before and after aging) of the electrical insulating layer frequently occurs, so that the service life of the cable is influenced.
Aiming at the defect brought by the improvement of the production speed, namely the serious exceeding of the tensile strength change rate before and after aging, the common method adopted in the industry at present is to reduce the production speed without modifying equipment, delay the time for the medium-voltage crosslinked cable insulating layer in a hot state to enter a cooling section for cooling and shaping, and reduce the problem of exceeding of the tensile strength change rate before and after aging of the electrical insulating layer caused by stress concentration due to quenching. But this solution ensures that the mechanical properties of the electrically insulating layer meet the requirements in a manner that sacrifices production efficiency. On the premise of not carrying out equipment transformation, not changing production efficiency and ensuring that the crosslinking degree accords with the national standard, the problem of exceeding insulation mechanical properties caused by unmatched process parameters in the extrusion process of the electric insulation layer of the medium-voltage cable is effectively solved, and the technical problem to be solved is urgent.
Disclosure of Invention
The invention aims to provide a method for improving the mechanical properties of an electric insulating layer of a medium-voltage crosslinked cable, which improves the mechanical properties of the electric insulating layer of the medium-voltage crosslinked cable on the premise of not carrying out equipment transformation, not reducing production efficiency and ensuring that the crosslinking degree accords with the national standard.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for improving the mechanical property of an electric insulating layer of a medium-voltage crosslinked cable, which is to turn off the heating of 1-2 sections positioned at the tail end of a crosslinking section under the condition of keeping the extrusion speed of an electric insulating material unchanged and produce the electric insulating layer of the medium-voltage crosslinked cable according to the original production condition.
Preferably, for the original layout mode that the cross-linking section and the pre-cooling section are 7 sections and 2 sections, the heating of the section 1 positioned at the tail end of the cross-linking section is turned off, so that the layout mode of the cross-linking section and the pre-cooling section is changed into 6 sections and 3 sections.
Preferably, the original layout mode of 9 sections plus 2 sections of the crosslinking section and the pre-cooling section is adopted to produce the alloy with the rated voltage of 35kV and the specification of 25-800 mm 2 When the cable is crosslinked, the heating of the section 1 positioned at the tail end of the crosslinking section is closed, so that the layout mode of the crosslinking section and the pre-cooling section is changed into 8 sections and 3 sections.
Preferably, aiming at the original layout mode that the cross-linking section and the pre-cooling section are 9 sections and 2 sections, the rated voltage is 10kV, 25-800 mm 2 When the cable is crosslinked, the 2 sections positioned at the tail end of the crosslinking section are closed and heated, so that the layout mode of the crosslinking section and the pre-cooling section is changed into 7 sections and 4 sections.
The invention provides a method for improving the mechanical property of an electric insulating layer of a medium-voltage crosslinked cable, which is to turn off the heating of 1-2 sections positioned at the tail end of a crosslinking section under the condition of keeping the extrusion speed of an electric insulating material unchanged and produce the electric insulating layer of the medium-voltage crosslinked cable according to the original production condition.
The invention closes the heating of the sections 1-2 positioned at the tail end of the crosslinking section, which is equivalent to reducing the crosslinking section and increasing the precooling section.
The invention does not carry out equipment transformation, does not introduce related calculation software, does not change the original production efficiency, and improves the mechanical property of the electric insulation layer of the medium-voltage crosslinked cable on the premise of ensuring that the crosslinking degree accords with the national standard.
Drawings
Fig. 1 is a schematic view of a medium voltage crosslinked cable electrical insulation co-extrusion apparatus.
Detailed Description
The invention provides a method for improving the mechanical property of an electric insulating layer of a medium-voltage crosslinked cable, which is to turn off the heating of 1-2 sections positioned at the tail end of a crosslinking section under the condition of keeping the extrusion speed of an electric insulating material unchanged and produce the electric insulating layer of the medium-voltage crosslinked cable according to the original production condition.
In the invention, for the original layout mode of the cross-linking section and the pre-cooling section which is 7 sections plus 2 sections, the heating of the cross-linking section at the tail end 1 section is preferably turned off, so that the layout mode of the cross-linking section and the pre-cooling section is changed into 6 sections plus 3 sections.
Aiming at the original layout mode that the cross-linking section and the pre-cooling section are 9 sections and 2 sections, when the cross-linking cable with the rated voltage of 35kV is produced, the invention preferably turns off the heating of the section 1 positioned at the tail end of the cross-linking section, so that the layout mode of the cross-linking section and the pre-cooling section is changed into 8 sections and 3 sections.
Aiming at the original layout mode that the cross-linking section and the pre-cooling section are 9 sections and 2 sections, when the cross-linking cable with the rated voltage of 10kV is produced, the invention preferably turns off the heating of the 2 sections positioned at the tail end of the cross-linking section, so that the layout mode of the cross-linking section and the pre-cooling section is changed into 7 sections and 4 sections.
The invention closes the heating of the sections 1-2 positioned at the tail end of the crosslinking section, which is equivalent to reducing the crosslinking section and increasing the precooling section.
The method for improving the mechanical properties of the electrical insulation layer of a medium voltage crosslinked cable according to the present invention will be described in detail with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
The above protocol was verified with a 9-segment+2-segment crosslinking unit from applicant company (Kunming Cable group Kunming Electrical Cable Co., ltd.):
original company rated voltage 10kV nominal section area 185mm 2 Copper core crosslinked polyethylene insulated cable core (YJV-10 kV-185) 2 ) The production speed is 7.0m/min, and the temperature of the crosslinking tube is as follows (DEG C): 390/390/370/370/350/320/320/310/285 when the production speed is regulated to 3.5m/min (the production efficiency is reduced by half) under the condition that the temperature of the crosslinking section is unchanged, the change rate of the tensile strength before and after aging still exceeds the national standard + -25%, and some of the tensile strength even reaches 35%. But by adding a precooling section mode (the original 9 sections are heated to 7 sections, the last two sections of heating pipes are closed and are not heated, the actual heat transfer temperature is about 200 ℃), the production is carried out under the condition of keeping the original production speed of 7.0m/min, the tensile strength of the produced medium-voltage crosslinked cable electrical insulation layer is kept below 20 percent before aging (all other performances meet the national standard requirements, including the crosslinking degree), and the expected target is achieved.
Example 2
The scheme is verified by a 9-section and 2-section crosslinking unit of applicant company:
nominal voltage 35kV nominal section 150mm of original company 2 Copper core crosslinked polyethylene insulated cable core (YJV-35 kV-150) 2 ) The production speed was 4.6m/min, and the cross-linking tube temperature (. Degree. C.) was as follows: 200/330/370/370/350/320/320/310/285 at crosslinking stage temperatureWhen the production speed is adjusted to 3.4m/min under the condition of change, the change rate of the tensile strength before and after aging still exceeds the national standard + -25%. By adding a precooling section mode (the original 9 sections are heated to 8 sections, the last section of heating pipe is closed and is not heated, the actual heat transfer temperature is about 200 ℃), the production is carried out under the condition of keeping the original production speed of 4.6m/min, and the tensile strength of the produced medium-voltage crosslinked cable electrical insulation layer is kept below 15% before aging, so that the expected target is achieved.
Example 3
The scheme is verified by a 7-section and 2-section crosslinking unit of applicant company:
nominal cross-section area of 10kV rated voltage 120mm of original company 2 Copper core crosslinked polyethylene insulated cable core (YJV-10 kV-120) 2 ) The production speed was 8.2m/min, and the cross-linking tube temperature (. Degree. C.) was as follows: 390/380/370/360/350/330/320 when the production speed is adjusted to 6m/min under the condition that the temperature of the crosslinking section is unchanged, the change rate of the tensile strength before and after aging still exceeds the national standard + -25%. The pre-cooling section mode is added (the original 7-section heating is changed into the 5-section heating, and finally the 2-section heating pipe is closed and is not heated, the actual heat transfer temperature is about 200 ℃, the production is carried out under the condition of keeping the original production speed of 8.2m/min, and the tensile strength of the produced medium-voltage crosslinked cable electrical insulation layer is kept below 15% before aging, so that the expected target is achieved.
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 (4)
1. A method for improving the mechanical properties of an electric insulating layer of a medium-voltage crosslinked cable is characterized in that under the condition of keeping the extrusion speed of an electric insulating material unchanged, the heating of the section 1-2 positioned at the tail end of a crosslinking section is closed, and the electric insulating layer of the medium-voltage crosslinked cable is produced according to the original production conditions.
2. The method according to claim 1, wherein the heating of the end 1 stage of the crosslinking section is turned off for the original layout of the crosslinking section and the pre-cooling section of 7+2 stages, so that the layout of the crosslinking section and the pre-cooling section is changed to 6+3 stages.
3. The method according to claim 1, wherein the method is characterized in that the original layout mode of the cross-linking section and the pre-cooling section is 9 sections plus 2 sections, the rated voltage is 35kV, and the specification is 25-800 mm 2 When the cable is crosslinked, the heating of the section 1 positioned at the tail end of the crosslinking section is closed, so that the layout mode of the crosslinking section and the pre-cooling section is changed into 8 sections and 3 sections.
4. The method according to claim 1, wherein the rated voltage is 10kV, 25-800 mm for the layout mode that the original crosslinking section and the pre-cooling section are 9 sections and 2 sections 2 When the cable is crosslinked, the 2 sections positioned at the tail end of the crosslinking section are closed and heated, so that the layout mode of the crosslinking section and the pre-cooling section is changed into 7 sections and 4 sections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310698941.6A CN116779252A (en) | 2023-06-13 | 2023-06-13 | Method for improving mechanical properties of electric insulation layer of medium-voltage crosslinked cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310698941.6A CN116779252A (en) | 2023-06-13 | 2023-06-13 | Method for improving mechanical properties of electric insulation layer of medium-voltage crosslinked cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116779252A true CN116779252A (en) | 2023-09-19 |
Family
ID=88010840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310698941.6A Pending CN116779252A (en) | 2023-06-13 | 2023-06-13 | Method for improving mechanical properties of electric insulation layer of medium-voltage crosslinked cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116779252A (en) |
-
2023
- 2023-06-13 CN CN202310698941.6A patent/CN116779252A/en active Pending
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