CN107508224B - Core body gluing structure and method for gas insulation end in direct-current wall bushing - Google Patents
Core body gluing structure and method for gas insulation end in direct-current wall bushing Download PDFInfo
- Publication number
- CN107508224B CN107508224B CN201610417507.6A CN201610417507A CN107508224B CN 107508224 B CN107508224 B CN 107508224B CN 201610417507 A CN201610417507 A CN 201610417507A CN 107508224 B CN107508224 B CN 107508224B
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- Prior art keywords
- flange
- core body
- epoxy
- cover plate
- wall bushing
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/22—Installations of cables or lines through walls, floors or ceilings, e.g. into buildings
-
- 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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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Insulators (AREA)
Abstract
The invention relates to a core body cementing structure and a method for a gas insulation end in a direct current wall bushing, which are provided with an epoxy core body and a central conductor. The invention improves the core structure of the sleeve gas insulation end, avoids SF 6 The problem of reduced insulating properties due to leakage of gas also solves the problem of partial discharge caused by distortion of the electric field at the interface.
Description
Technical Field
The invention relates to a manufacturing technology of a direct current wall bushing, in particular to a core body gluing structure and a method of a gas insulation end in the direct current wall bushing.
Background
Bushings are electrical components that guide the high, low voltage and neutral leads inside the transformer to the outside of the transformer tank, which not only act as a lead to ground insulation, but also act to secure the lead. The direct-current bushing is used for the outgoing line end of equipment such as a converter transformer, a smoothing reactor and the like in a direct-current system, and the direct-current wall bushing provides reliable insulation and support for a current output valve hall.
Epoxy resin paper-impregnated bushings have been widely used in power transformers, especially in dc systems, as new products developed in recent years. The current mainstream insulation structure is:
1. the main insulation adopts epoxy resin paper dipping;
2. the external insulation adopts a silicon rubber composite insulation sleeve;
3. SF is adopted between the inner insulation and the outer insulation 6 Gas (or other insulating filling material) as auxiliary insulation。
Due to the structure, the epoxy resin impregnated paper type main insulation and SF 6 There are various problems to be solved between the gas-assisted insulations, i.e. the gas-insulated ends of the epoxy cores. In recent years, from the aspect of the effect of engineering reaction, the treatment is not ideal, and the problems of sealing, electric field distortion between interfaces, fixation of main insulation and a central conductor and the like exist:
1. the sealing structure of the gas insulation end of the epoxy core is unreasonable, resulting in SF 6 The gas enters the interior of the epoxy core or the gap with the central conductor, resulting in SF 6 Leakage of gas and degradation of insulation performance.
2. Epoxy core and SF 6 The shape of the charged body of the gas-insulated contact surface is not ideal, which causes distortion of the electric field at the interface and partial discharge.
3. The fixed structure between the epoxy core and the sleeve central conductor is unreasonable, and when the temperature rises in the product operation, displacement is generated between the epoxy core and the sleeve central conductor.
In order to ensure the operation safety of the bushing, and avoid the occurrence of the above problems, it is necessary to improve the core structure of the gas-insulated end of the bushing to meet the requirements of the safety performance of the power system.
Disclosure of Invention
Aiming at the defects of sealing, interfacial electric field distortion, fixing of main insulation and a central conductor and the like of a gas insulation end in a direct current wall bushing in the prior art, the invention aims to provide a core body gluing structure and a core body gluing method of the gas insulation end in the direct current wall bushing, which can avoid the problems and meet the safety performance requirements of a power system.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses a core body cementing structure of a gas insulation end in a direct current wall bushing, which is provided with an epoxy core body and a central conductor, wherein a flange is arranged at the gas insulation end of the epoxy core body, cementing is carried out between the flange and the epoxy core body in a key slot mode, namely, the flange and the epoxy core body are fixed by filling epoxy resin in the key slot arranged between the flange and the epoxy core body.
And 2-3 axial seals are respectively arranged between the flange and the epoxy core body and between the flange and the central conductor.
One end of the sleeve epoxy core body is provided with a fixed structure, namely a cover plate is arranged on the flange, the cover plate is fixed with the flange through bolts, and the cover plate is fixed with the central conductor in a threaded mode; the other end of the sleeve epoxy core body is fixed radially
The outer edges of the flange and the cover plate are rounded.
The flange is internally provided with a concave table, and the flange is connected with a zero screen outgoing line in the epoxy core body through screws and leads in the concave table.
The flange and the cover plate are made of aluminum alloy or copper alloy materials capable of preventing eddy current loss.
The invention discloses a core body gluing method of a gas insulation end in a direct current wall bushing, which comprises the following steps of:
the flange and the zero screen outgoing line of the epoxy core body are connected and fastened through a fastener;
sleeving the first sealing gasket into a groove corresponding to the inner wall of the epoxy core body;
inserting the flange into the gas insulation end of the epoxy core body, and injecting liquid epoxy resin through the glue injection hole;
standing for a prescribed time to enable the liquid epoxy resin to be dried and firmly bonded to form a whole;
sleeving the second sealing gasket into the groove on the inner wall of the flange;
the central conductor is inserted from the lower end of the epoxy core body, and the cover plate is screwed downwards from the thread at the upper end of the central conductor to a position attached to the flange;
the cover plate and the flange are connected into a whole by fasteners.
The invention has the following beneficial effects and advantages:
1. the invention improves the core structure of the sleeve gas insulation end, avoids SF 6 The problem of reduced insulating properties due to leakage of gas also solves the problem of partial discharge caused by distortion of the electric field at the interface.
2. The invention improves the fixing structure between the sleeve epoxy core and the central conductor. When the temperature of the sleeve changes, one end is not constrained when expanding with heat and contracting with cold in the axial direction, so that the epoxy core body and the central conductor can be prevented from bearing excessive force, the sealing reliability is ensured, and the safe operation of the sleeve is ensured.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention.
Wherein 1a is a first fastener, 1b is a second fastener, 2 is a zero screen outgoing line, 3 is an epoxy core, 4 is epoxy resin, 5 is a cover plate, 6 is a flange, 7a is a first sealing gasket, 7b is a first sealing gasket, and 8 is a central conductor.
Detailed Description
The invention is further elucidated below in connection with the drawings of the specification.
As shown in fig. 1, the core gluing structure of the gas insulation end in the direct current wall bushing of the invention is provided with an epoxy core 3 and a central conductor 8, wherein a flange 6 is arranged at the gas insulation end of the epoxy core 3, glue is performed between the flange 6 and the epoxy core 3 in a key slot mode, namely epoxy resin 4 is filled in the key slot between the flange and the epoxy core, and after the epoxy resin is solidified, the flange 6 and the epoxy core 3 are fixed.
2-3 axial seals are respectively arranged between the flange 6 and the epoxy core body 3 and between the flange 6 and the central conductor 8 to isolate SF 6 Gas so that it cannot enter the interior of the epoxy core 3 or the gap with the center conductor 8; the flange 6 is provided with the cover plate 5, a group of bolts (namely, the second fastening piece 1 b) are adopted between the cover plate 5 and the flange 6 for relative fixation, and the cover plate 5 and the central conductor 8 are fixed by adopting threads, so that the epoxy core 3 and the central conductor 8 cannot axially displace or rotate; the above-mentioned fixed structure is only set up in one end of the sleeve epoxy core 3, and the other end only adopts radial fixation. Therefore, when the temperature of the product changes, the other end of the product can generate tiny displacement with the central conductor, and the core body is prevented from generating excessive mechanical stress.
In this embodiment, the outer edges of the flange 6 and the cover plate 5 are subjected to reasonable rounding treatment, so that the electric field at the junction of the two insulating mediums is uniformly transited, the electric field concentration degree at the junction is reduced, and the partial discharge level at the junction is reduced.
A concave table is arranged in the flange 6, the flange 6 is connected with the zero screen outgoing line 2 in the epoxy core 3 by using screws and leads in the concave table, so that equipotential connection is formed between the central conductor 8 and the core zero screen outgoing line 2, and good electric field shielding is formed on the outer surface of the central conductor 8. The flange 6 is connected with the zero screen outgoing line 2 inside the epoxy core body 3, so that the problem of suspension of the flange 6 and the cover plate 5 in an electric field is solved, and the possibility of discharging of metal parts in an insulating medium is avoided.
In this embodiment, the flange 6 and the cover plate 5 are made of aluminum alloy or copper alloy, so as to prevent eddy current loss.
The invention discloses a core body gluing method of a gas insulation end in a direct current wall bushing, which comprises the following steps of:
the flange 6 and the zero screen outgoing line 2 of the epoxy core body 3 are connected and fastened through a first fastener 1 a;
the first sealing gasket 7a is sleeved in a groove of the flange 6 corresponding to the inner wall of the epoxy core 3;
inserting the flange 6 into the gas insulation end of the epoxy core 3, and injecting liquid epoxy resin 4 through the glue injection hole;
standing for a prescribed time to enable the liquid epoxy resin 4 to be dried and firmly bonded to form a whole;
the second sealing gasket 7b is sleeved in the groove on the inner wall of the flange 6;
the central conductor 8 is inserted from the lower end of the epoxy core body 3, and the cover plate 5 is screwed downwards from the thread position at the upper end of the central conductor 8 to a position attached to the flange 6;
the cover plate 5 and the flange 6 are connected as a single body by a second fastener 1 b.
The invention has reasonable structure and simple method, solves the problems of sealing, electric field distortion between interfaces, fixation of main insulation and a central conductor, and the like, and meets the safety requirement of a power system.
Claims (5)
1. The utility model provides a core mucilage binding structure of gas-insulated end in direct current wall bushing, has epoxy core and center conductor, its characterized in that: a flange is arranged at the gas insulation end of the epoxy core body, and glue is applied between the flange and the epoxy core body in a key slot mode, namely the flange and the epoxy core body are fixed by filling epoxy resin in the key slot arranged between the flange and the epoxy core body;
one end of the sleeve epoxy core body is provided with a fixed structure, namely a cover plate is arranged on the flange, the cover plate is fixed with the flange through bolts, and the cover plate is fixed with the central conductor in a threaded mode; the other end of the sleeve epoxy core body is radially fixed;
the core body gluing method of the gas insulation end in the direct current wall bushing comprises the following steps:
the flange and the zero screen outgoing line of the epoxy core body are connected and fastened through a fastener;
sleeving the first sealing gasket into a groove corresponding to the inner wall of the epoxy core body;
inserting the flange into the gas insulation end of the epoxy core body, and injecting liquid epoxy resin through the glue injection hole;
standing for a prescribed time to enable the liquid epoxy resin to be dried and firmly bonded to form a whole;
sleeving the second sealing gasket into the groove on the inner wall of the flange;
the central conductor is inserted from the lower end of the epoxy core body, and the cover plate is screwed downwards from the thread at the upper end of the central conductor to a position attached to the flange;
the cover plate and the flange are connected into a whole by fasteners.
2. A core glue construction for a gas insulated end of a dc wall bushing as defined in claim 1, wherein: and 2-3 axial seals are respectively arranged between the flange and the epoxy core body and between the flange and the central conductor.
3. A core glue construction for a gas insulated end of a dc wall bushing as defined in claim 1, wherein: the outer edges of the flange and the cover plate are rounded.
4. A core glue construction for a gas insulated end of a dc wall bushing as defined in claim 1, wherein: the flange is internally provided with a concave table, and the flange is connected with a zero screen outgoing line in the epoxy core body through screws and leads in the concave table.
5. A core glue construction for a gas insulated end of a dc wall bushing as defined in claim 1, wherein: the flange and the cover plate are made of aluminum alloy or copper alloy materials capable of preventing eddy current loss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610417507.6A CN107508224B (en) | 2016-06-14 | 2016-06-14 | Core body gluing structure and method for gas insulation end in direct-current wall bushing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610417507.6A CN107508224B (en) | 2016-06-14 | 2016-06-14 | Core body gluing structure and method for gas insulation end in direct-current wall bushing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107508224A CN107508224A (en) | 2017-12-22 |
| CN107508224B true CN107508224B (en) | 2023-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610417507.6A Active CN107508224B (en) | 2016-06-14 | 2016-06-14 | Core body gluing structure and method for gas insulation end in direct-current wall bushing |
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| Country | Link |
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| CN (1) | CN107508224B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112002504A (en) * | 2020-08-06 | 2020-11-27 | 国网电力科学研究院武汉南瑞有限责任公司 | Development method of epoxy resin impregnated glass fiber direct current sleeve |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11111090A (en) * | 1997-10-07 | 1999-04-23 | Hitachi Cable Ltd | Epoxy resin mould bushing for gas tight installation of gas filled switch |
| CN201237973Y (en) * | 2008-06-01 | 2009-05-13 | 江苏思源赫兹互感器有限公司 | Sulfur hexafluoride current mutual inductor with small-diameter casing tube |
| CN202796280U (en) * | 2012-07-24 | 2013-03-13 | 特变电工沈阳变压器集团有限公司 | Multilayer composite seal structure in gas-insulation direct current bushing |
| CN203085335U (en) * | 2012-11-07 | 2013-07-24 | 中国西电电气股份有限公司 | Glue impregnated paper capacitance-type transformer bushing |
| CN203433970U (en) * | 2013-09-11 | 2014-02-12 | 江苏智达高压电气有限公司 | Tail sealing structure of integral oiled paper capacitor bushing |
| CN203503442U (en) * | 2013-09-11 | 2014-03-26 | 江苏智达高压电气有限公司 | Integral-type oil-impregnated paper high-voltage bushing |
| CN205791354U (en) * | 2016-06-14 | 2016-12-07 | 沈阳和新套管有限公司 | The core body mucilage binding structure of gas-insulated end in a kind of direct-current wall bushing |
-
2016
- 2016-06-14 CN CN201610417507.6A patent/CN107508224B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11111090A (en) * | 1997-10-07 | 1999-04-23 | Hitachi Cable Ltd | Epoxy resin mould bushing for gas tight installation of gas filled switch |
| CN201237973Y (en) * | 2008-06-01 | 2009-05-13 | 江苏思源赫兹互感器有限公司 | Sulfur hexafluoride current mutual inductor with small-diameter casing tube |
| CN202796280U (en) * | 2012-07-24 | 2013-03-13 | 特变电工沈阳变压器集团有限公司 | Multilayer composite seal structure in gas-insulation direct current bushing |
| CN203085335U (en) * | 2012-11-07 | 2013-07-24 | 中国西电电气股份有限公司 | Glue impregnated paper capacitance-type transformer bushing |
| CN203433970U (en) * | 2013-09-11 | 2014-02-12 | 江苏智达高压电气有限公司 | Tail sealing structure of integral oiled paper capacitor bushing |
| CN203503442U (en) * | 2013-09-11 | 2014-03-26 | 江苏智达高压电气有限公司 | Integral-type oil-impregnated paper high-voltage bushing |
| CN205791354U (en) * | 2016-06-14 | 2016-12-07 | 沈阳和新套管有限公司 | The core body mucilage binding structure of gas-insulated end in a kind of direct-current wall bushing |
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| CN107508224A (en) | 2017-12-22 |
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