CN113851287A - Processing method of dry high-voltage bushing with built-in equalizing balls and high-voltage bushing - Google Patents
Processing method of dry high-voltage bushing with built-in equalizing balls and high-voltage bushing Download PDFInfo
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- CN113851287A CN113851287A CN202111087809.9A CN202111087809A CN113851287A CN 113851287 A CN113851287 A CN 113851287A CN 202111087809 A CN202111087809 A CN 202111087809A CN 113851287 A CN113851287 A CN 113851287A
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- Prior art keywords
- built
- core
- dry
- coiled
- voltage bushing
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- 238000003672 processing method Methods 0.000 title claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims abstract description 28
- 238000005266 casting Methods 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000001035 drying Methods 0.000 claims abstract description 11
- 238000004804 winding Methods 0.000 claims abstract description 9
- 239000002131 composite material Substances 0.000 claims abstract description 7
- 238000003754 machining Methods 0.000 claims abstract description 6
- 238000001291 vacuum drying Methods 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 12
- 239000003822 epoxy resin Substances 0.000 claims description 9
- 229920000647 polyepoxide Polymers 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims 2
- 238000005034 decoration Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
- H01B19/02—Drying; Impregnating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/56—Insulating bodies
- H01B17/58—Tubes, sleeves, beads, or bobbins through which the conductor passes
- H01B17/583—Grommets; Bushings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulators (AREA)
- Insulating Bodies (AREA)
Abstract
The invention discloses a processing method of a dry-type high-voltage bushing with built-in pressure-equalizing balls, wherein the built-in pressure-equalizing balls are screwed outside a pipe body at one end of a coiled aluminum pipe; then winding the crepe paper on the surfaces of the coiled aluminum pipe and the built-in pressure equalizing ball, and winding to the required thickness to form a coiled core; then the rolled core is placed in a drying device for vacuum drying; then, placing the dried coiled core into a casting tool cylinder, adding a casting agent into the casting tool cylinder under a vacuum condition to cast the coiled core, and then, heating and curing the coiled core; then, demoulding the heated and cured coiled core to obtain a dry capacitor core, and machining the dry capacitor core according to requirements; and finally, assembling the dry capacitor core with parts such as a flange, a hollow composite insulating sleeve and the like to obtain the dry high-voltage bushing with the built-in voltage-sharing ball. The high-voltage bushing manufactured by the processing method provided by the invention can effectively solve the problem of loosening of the equalizing balls and improve the operation reliability.
Description
Technical Field
The invention relates to a processing method of a dry-type high-voltage bushing with built-in voltage-sharing balls and a high-voltage bushing, belonging to the field of electric high-voltage bushings.
Background
The voltage-sharing balls of the conventional transformer bushing are fixed on the metal piece at the tail part of the bushing through bolts or threads, so that the risk of transformer accidents caused by high surface field intensity and poor bolt connection under long-term operation and vibration exists; meanwhile, during each test, the test is inconvenient because the disassembly and the assembly are required.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides the processing method of the dry-type high-voltage bushing with the built-in voltage-sharing balls.
The technical scheme adopted by the invention is as follows:
a processing method of a dry-type high-voltage bushing with built-in equalizing balls comprises the following steps:
the method comprises the following steps: screwing a built-in pressure equalizing ball outside the pipe body at one end of the coiled aluminum pipe;
step two: winding crepe paper on the surfaces of the coiled aluminum pipe and the built-in pressure equalizing ball, and winding to a required thickness to form a coiled core;
step three: placing the rolled core into a drying device for vacuum drying;
step four: placing the dried coiled core into a casting tool cylinder, adding a casting agent into the casting tool cylinder under a vacuum condition to cast the coiled core, and then heating and curing the coiled core;
step five: demolding the coiled core after the heating and curing are finished to obtain a dry capacitor core;
step six: machining the demolded dry capacitor core according to the requirement;
step seven: and assembling the flange and the hollow composite insulating sleeve on the machined dry capacitor core to obtain the dry high-voltage bushing with the built-in voltage-sharing ball.
Preferably, the vacuum degree in the third step is-100 pa to-120 pa.
Further preferably, the drying temperature in the third step is 60-70 ℃.
More preferably, the vacuum degree in the fourth step is-150 pa to-160 pa.
Further preferably, the casting agent in the fourth step is a mixture of an epoxy resin and a curing agent.
Further preferably, the temperature for heating and curing in the fourth step is 100-120 ℃.
The high-voltage bushing is manufactured by the processing method of the dry high-voltage bushing with the built-in pressure equalizing balls.
The invention has the beneficial effects that:
the voltage-sharing ball is screwed at the tail part of the coiled aluminum pipe in advance when a dry-type capacitor core is produced, and is coiled, poured and cured along with the dry-type capacitor core, after the dry-type capacitor core is cured, the voltage-sharing ball and the capacitor core form a whole, the problem of looseness of the voltage-sharing ball does not exist, the periphery of the voltage-sharing ball is cured epoxy resin, the insulating property of the epoxy resin is far higher than that of transformer oil, the surface field intensity of the voltage-sharing ball is reduced, the running reliability of a transformer bushing is improved, the test efficiency of the bushing can be greatly improved, the test time is shortened, and the strength of test installation is reduced.
Drawings
FIG. 1 is a schematic structural view of a dry capacitor core according to the present invention;
the main reference numerals in the figures have the following meanings:
1. the device comprises a coiled aluminum pipe, 2 parts of a built-in voltage-sharing ball, 3 parts of a dry capacitor core, 4 parts of a flange, 5 parts of a hollow composite insulating sleeve.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
Example 1: as shown in fig. 1: a processing method of a dry-type high-voltage bushing with built-in equalizing balls comprises the following steps:
the method comprises the following steps: screwing a built-in pressure equalizing ball 2 outside the pipe body at one end of the coiled aluminum pipe 1;
step two: winding crepe paper on the surfaces of the coiled aluminum pipe 1 and the built-in pressure equalizing ball 2 to a required thickness to form a coiled core;
step three: placing the rolled core into a drying device for vacuum drying;
step four: placing the dried coiled core into a casting tool cylinder, adding a casting agent into the casting tool cylinder under a vacuum condition to cast the coiled core, and then heating and curing the coiled core;
step five: demolding the coiled core after the heating and curing are finished to obtain a dry capacitor core 3;
step six: machining the demolded dry capacitor core 3 as required;
step seven: and assembling the flange 4, the hollow composite insulating sleeve 5 and other parts fixedly adopted on the sleeve to the machined dry capacitor core 3 to obtain the dry high-voltage sleeve with the built-in equalizing ball.
In this example, the vacuum degree in the third step was-100 pa.
In this example, the drying temperature in step three was 60 ℃.
In this example, the vacuum degree in the fourth step was-150 pa.
In this embodiment, the casting agent in step four is a mixture of an epoxy resin and a curing agent.
In this embodiment, the temperature for heating and curing in the fourth step is 100 ℃.
The high-voltage bushing is manufactured by the processing method of the dry high-voltage bushing with the built-in pressure equalizing balls.
Example 2: as shown in fig. 1: a processing method of a dry-type high-voltage bushing with built-in equalizing balls comprises the following steps:
the method comprises the following steps: screwing a built-in pressure equalizing ball 2 outside the pipe body at one end of the coiled aluminum pipe 1;
step two: winding crepe paper on the surfaces of the coiled aluminum pipe 1 and the built-in pressure equalizing ball 2 to a required thickness to form a coiled core;
step three: placing the rolled core into a drying device for vacuum drying;
step four: placing the dried coiled core into a casting tool cylinder, adding a casting agent into the casting tool cylinder under a vacuum condition to cast the coiled core, and then heating and curing the coiled core;
step five: demolding the coiled core after the heating and curing are finished to obtain a dry capacitor core 3;
step six: machining the demolded dry capacitor core 3 as required;
step seven: and assembling the flange 4, the hollow composite insulating sleeve 5 and other parts fixedly adopted on the sleeve to the machined dry capacitor core 3 to obtain the dry high-voltage sleeve with the built-in equalizing ball.
In this example, the vacuum degree in the third step was-120 pa.
In this example, the drying temperature in step three was 70 ℃.
In this example, the vacuum degree in the fourth step was-160 pa.
In this embodiment, the casting agent in step four is a mixture of an epoxy resin and a curing agent.
In this embodiment, the temperature for heating and curing in the fourth step is 120 ℃.
The high-voltage bushing is manufactured by the processing method of the dry high-voltage bushing with the built-in pressure equalizing balls.
Example 3: as shown in fig. 1: a processing method of a dry-type high-voltage bushing with built-in equalizing balls comprises the following steps:
the method comprises the following steps: screwing a built-in pressure equalizing ball 2 outside the pipe body at one end of the coiled aluminum pipe 1;
step two: winding crepe paper on the surfaces of the coiled aluminum pipe 1 and the built-in pressure equalizing ball 2 to a required thickness to form a coiled core;
step three: placing the rolled core into a drying device for vacuum drying;
step four: placing the dried coiled core into a casting tool cylinder, adding a casting agent into the casting tool cylinder under a vacuum condition to cast the coiled core, and then heating and curing the coiled core;
step five: demolding the coiled core after the heating and curing are finished to obtain a dry capacitor core 3;
step six: machining the demolded dry capacitor core 3 as required;
step seven: and assembling the flange 4, the hollow composite insulating sleeve 5 and other parts fixedly adopted on the sleeve to the machined dry capacitor core 3 to obtain the dry high-voltage sleeve with the built-in equalizing ball.
In this example, the vacuum in step three was-110 pa.
In this example, the drying temperature in step three was 65 ℃.
In this example, the vacuum degree in the fourth step was-155 pa.
In this embodiment, the casting agent in step four is a mixture of an epoxy resin and a curing agent.
In this embodiment, the temperature for heating and curing in the fourth step is 110 ℃.
The high-voltage bushing is manufactured by the processing method of the dry high-voltage bushing with the built-in pressure equalizing balls.
According to the invention, the equalizing ball is screwed at the tail part of the coiled aluminum pipe in advance when the dry-type capacitor core is produced, and is coiled, cast and cured together with the dry-type capacitor core, after the dry-type capacitor core is cured, the equalizing ball and the capacitor core form a whole, so that the problem of loosening of the equalizing ball is avoided, the periphery of the equalizing ball is made of cured epoxy resin, the insulating property of the epoxy resin is far higher than that of transformer oil, the surface field intensity of the equalizing ball is reduced, the running reliability of a transformer bushing is improved, the test efficiency of the bushing can be greatly improved, the test time is shortened, and the strength of test installation is reduced.
The above description is only a preferred embodiment of the present patent, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the inventive concept, and these modifications and decorations should also be regarded as the protection scope of the present patent.
Claims (7)
1. A processing method of a dry-type high-voltage bushing with built-in equalizing balls is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: screwing a built-in pressure equalizing ball outside the pipe body at one end of the coiled aluminum pipe;
step two: winding crepe paper on the surfaces of the coiled aluminum pipe and the built-in pressure equalizing ball, and winding to a required thickness to form a coiled core;
step three: placing the rolled core into a drying device for vacuum drying;
step four: placing the dried coiled core into a casting tool cylinder, adding a casting agent into the casting tool cylinder under a vacuum condition to cast the coiled core, and then heating and curing the coiled core;
step five: demolding the coiled core after the heating and curing are finished to obtain a dry capacitor core;
step six: machining the demolded dry capacitor core according to the requirement;
step seven: and assembling the flange and the hollow composite insulating sleeve on the machined dry capacitor core to obtain the dry high-voltage bushing with the built-in voltage-sharing ball.
2. The method for processing the dry high-voltage bushing with the built-in pressure equalizing ball as claimed in claim 1, wherein the vacuum degree in the third step is-100 pa to-120 pa.
3. The method for manufacturing a dry high-voltage bushing with built-in pressure equalizing balls as claimed in claim 1, wherein the drying temperature in the third step is 60-70 ℃.
4. The method for manufacturing a dry high-voltage bushing with built-in pressure equalizing balls as claimed in claim 1, wherein the vacuum degree in the fourth step is-150 pa to-160 pa.
5. The method as claimed in claim 1, wherein the casting agent in step four is a mixture of epoxy resin and curing agent.
6. The method as claimed in claim 1, wherein the temperature for heating and curing in the fourth step is 100-120 ℃.
7. A high-voltage bushing, characterized in that it is manufactured by the method of any of claims 1-6 of the dry high-voltage bushing with built-in pressure-equalizing balls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111087809.9A CN113851287A (en) | 2021-09-16 | 2021-09-16 | Processing method of dry high-voltage bushing with built-in equalizing balls and high-voltage bushing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111087809.9A CN113851287A (en) | 2021-09-16 | 2021-09-16 | Processing method of dry high-voltage bushing with built-in equalizing balls and high-voltage bushing |
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| Publication Number | Publication Date |
|---|---|
| CN113851287A true CN113851287A (en) | 2021-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111087809.9A Pending CN113851287A (en) | 2021-09-16 | 2021-09-16 | Processing method of dry high-voltage bushing with built-in equalizing balls and high-voltage bushing |
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| CN (1) | CN113851287A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1350304A (en) * | 2001-12-08 | 2002-05-22 | 弥璞 | Composite high-voltage casing and its production process |
| CN201402952Y (en) * | 2009-04-03 | 2010-02-10 | 褚斌 | Dry-type high-voltage bushing |
| US20130233613A1 (en) * | 2012-03-08 | 2013-09-12 | Siemens Aktiengesellschaft | Condenser-type high-voltage bushing and method for producing the bushing |
-
2021
- 2021-09-16 CN CN202111087809.9A patent/CN113851287A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1350304A (en) * | 2001-12-08 | 2002-05-22 | 弥璞 | Composite high-voltage casing and its production process |
| CN201402952Y (en) * | 2009-04-03 | 2010-02-10 | 褚斌 | Dry-type high-voltage bushing |
| US20130233613A1 (en) * | 2012-03-08 | 2013-09-12 | Siemens Aktiengesellschaft | Condenser-type high-voltage bushing and method for producing the bushing |
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