CN113643863A - Novel dry-type sleeve for electric power system - Google Patents
Novel dry-type sleeve for electric power system Download PDFInfo
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- CN113643863A CN113643863A CN202110575591.5A CN202110575591A CN113643863A CN 113643863 A CN113643863 A CN 113643863A CN 202110575591 A CN202110575591 A CN 202110575591A CN 113643863 A CN113643863 A CN 113643863A
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- ground potential
- shielding electrode
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- main insulating
- power system
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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
- H01B17/26—Lead-in insulators; Lead-through insulators
- H01B17/28—Capacitor type
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- 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
- H01F27/02—Casings
- H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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Abstract
The invention discloses a novel dry-type sleeve for an electric power system, wherein a semiconductor shielding layer is arranged between an inner cavity of a main insulating pipe and a current-carrying conducting rod component, carbon fibers impregnated with epoxy resin are arranged on the outer wall of the main insulating pipe to form a ground potential shielding electrode, a mounting flange is arranged on the outer side of the ground potential shielding electrode, semiconductor rubber is arranged at the end part of the ground potential shielding electrode, and a silicon rubber umbrella sleeve and the semiconductor rubber are solidified on the outer wall of the main insulating pipe together. The invention can adopt multi-stage main insulating tubes to be connected in series, the highest voltage of the sleeve can be 550kV or higher, the current level can be from several amperes to several tens of thousands of amperes, and the invention can be used for an alternating current power system and a direct current power system. The invention has wider application field and can be used for high-voltage electric appliance outgoing lines such as transformers, reactors, GIS or SF6 gas switches and the like. Compared with the traditional sleeve, the invention has the advantages of small volume, light weight, lower manufacturing cost and higher reliability, and has no explosion and fire risks when being used on a transformer.
Description
The technical field is as follows:
the invention relates to a novel dry-type sleeve for an electric power system.
Background art:
at present, a porcelain oil-filled structure is adopted in a voltage class of 40.5kV and below in an electric power system; for bushings of higher voltage class, a capacitive structure is generally used to improve the electric field distribution at the outer insulating surface.
Fig. 8 is a porcelain oil-filled structure, in which a layer of conductive or low-resistance material is coated on the surface of the porcelain bushing near the flange 800, and forms a ground potential electrode together with the flange 800, so that the electric field distribution at the position is improved, and the corona voltage can exceed 50 kV.
Fig. 9 shows a condenser bushing structure, which generally uses aluminum foil as a condenser screen built into a main insulator core.
For a bushing with a higher voltage grade exceeding 40.5kV, the safe operation of a product can be ensured only by adopting capacitor voltage sharing, and currently, three forms are adopted:
1) the oil paper capacitive bushing has a capacitor core wound by cable paper, a plurality of layers of capacitive screens are placed in the middle of the paper layer, and the capacitive screens are subjected to vacuum drying and then are impregnated with transformer oil;
2) a dry-type bushing of glue-impregnated paper (RIP) is characterized in that a capacitor core is wound by crepe paper, a plurality of layers of capacitor screens are placed in the middle of a paper layer, and resin is impregnated after long-time vacuum drying;
3) the glass fiber reinforced plastic sleeve is characterized in that a capacitor core is made of glass fiber yarns and epoxy resin is impregnated in the glass fiber reinforced plastic sleeve, then a plurality of layers of capacitor screens are wound in the atmosphere, and impurities, bubbles, moisture and the like are inevitably introduced into the core due to the fact that the winding process is exposed in the air for a long time.
The three types of sleeves adopting the capacitive screen structure have higher manufacturing process complexity and manufacturing cost.
The invention content is as follows:
the present invention is directed to solving the above-mentioned problems of the prior art and to providing a novel dry bushing for an electric power system. The invention can adopt multi-stage main insulating tubes to be connected in series, the highest voltage of the sleeve can be 550kV or higher, the current level can be from several amperes to several tens of thousands of amperes, and the invention can be used for an alternating current power system and a direct current power system. The invention has wider application field and can be used for high-voltage electric appliance outgoing lines such as transformers, reactors, GIS or SF6 gas switches and the like. Compared with the traditional sleeve, the transformer has the advantages of small volume, light weight, lower manufacturing cost, higher reliability and no explosion and fire risks.
The technical scheme adopted by the invention is as follows:
the utility model provides a novel dry-type sleeve pipe for electric power system, includes main insulating tube, semiconductor shielding layer, semiconductor rubber, silicon rubber chute boot, current-carrying conducting rod part and mounting flange, current-carrying conducting rod part wears to locate in the main insulating tube, is equipped with the semiconductor shielding layer between main insulating tube inner chamber and current-carrying conducting rod part, is equipped with the carbon fiber of flooding epoxy on the main insulating tube outer wall and forms ground potential shielding electrode, and mounting flange locates the outside of ground potential shielding electrode, installs semiconductor rubber at the tip of ground potential shielding electrode, and the silicon rubber chute boot solidifies on main insulating tube outer wall with semiconductor rubber together.
A ground potential shielding electrode main portion is attached to the outer wall of the main insulating tube in the vicinity of a mounting flange, and a semi-vulcanized semiconductor rubber is mounted on the end portion of the ground potential shielding electrode main portion on the air side. And (3) filling the main insulating core in the state into a mould, spraying a coupling agent on the surface, and injecting or mould-pressing silicon rubber to finally form the insulating part which is free of physical interface and air gap and wraps the main part of the shielding electrode and the semiconductor rubber by the silicon rubber umbrella cover.
Furthermore, the main insulating pipe is made of pultruded glass fiber reinforced plastic or epoxy resin or polyurethane or polytetrafluoroethylene.
Furthermore, the current-carrying conducting rod part is made of copper or aluminum.
Further, semi-vulcanized semiconductor rubber is mounted at the end part of the air side of the ground potential shielding electrode, and after the silicon rubber umbrella cover is injected or molded, the semi-vulcanized semiconductor rubber and the silicon rubber umbrella cover are solidified on the outer wall of the main insulating pipe together.
Furthermore, a lining framework is arranged inside the ground potential shielding electrode.
Furthermore, the lining framework is made of aluminum alloy, and is cast and solidified with the semiconductor material to form the ground potential shielding electrode.
The invention has the following beneficial effects:
1) the main insulating core can adopt a pultrusion insulating tube, so that the electric performance is reliable, the efficiency is high, and the cost is low; the structure is simple, no processing residue is left, the environment is protected, and the ground potential electrode can be directly grounded with the mounting flange in a short circuit manner;
2) the invention can also wind a layer of insulation outside the shielding electrode, and lead out through a capacitance measuring tap to be used as a signal for partial discharge, dielectric loss and capacitance test.
3) The invention fully utilizes the insulation tolerance of the insulating tube and solves the problem of end field intensity concentration of the ground potential shielding electrode. The semiconductor rubber at the end part of the outer shield or the ground potential shielding electrode with the lining framework is added, so that the field intensity at the end part of the outer shield can be reduced; the rubber is embedded in the silicon rubber solid insulating material, so that the corona onset field intensity of the upper end part can be greatly improved.
4) The invention can also adopt multi-stage main insulating tubes to be connected in series, and the highest voltage of the sleeve can reach 550kV or higher; by varying the current carrying conductors, the current levels can range from a few amperes to tens of thousands of amperes, and can be used in both ac and dc power systems.
5) The invention has wider application field and can be used for high-voltage electric appliance outgoing lines such as transformers, reactors, GIS or SF6 gas switches and the like.
6) Compared with the traditional sleeve, the sleeve is small in size, light in weight, lower in manufacturing cost, higher in reliability and free of explosion and fire risks.
Description of the drawings:
FIG. 1 is a single shield structure.
Fig. 2 is an end shield electrode.
Fig. 3 is a double shield structure with measurement terminals.
Fig. 4 shows the main insulated ground potential shield main electrode.
Fig. 5 shows a high voltage electrode insulation structure inside the main insulation tube.
Fig. 6 is a schematic diagram of a 126kV bushing.
Fig. 7 is a schematic diagram of a 10kV bushing.
Fig. 8 is a schematic view of a prior art porcelain oil filled bushing.
Fig. 9 is a schematic view of a prior art condenser bushing.
The specific implementation mode is as follows:
the invention will be further described with reference to the accompanying drawings.
Example one
Referring to fig. 1, the novel dry-type bushing for an electric power system of the invention comprises a main insulating pipe 1, a high-voltage shielding electrode 2, a ground potential shielding electrode 3, semiconductor rubber 4, a silicon rubber umbrella cover 5, a current-carrying conducting rod part 6 and a mounting flange 7.
A semi-conductor shielding layer 2 is arranged between an inner cavity of a main insulating tube 1 and a current-carrying conducting rod part 6, a ground potential shielding electrode 3 is formed by carbon fibers impregnated with epoxy resin on the outer wall of the main insulating tube 1, semi-vulcanized semi-conductor rubber 4 is arranged at the upper end part of the ground potential shielding electrode, and after a silicon rubber umbrella sleeve 5 is injected or molded, the semi-vulcanized semi-conductor rubber 4 and the silicon rubber umbrella sleeve are solidified on the outer wall of the main insulating tube 1 together.
A ground potential shielding electrode 3 is attached to the outer wall of the main insulating tube 1 near a mounting flange 7, and a semi-vulcanized semiconductor rubber 4 is mounted on the air-side end of the ground potential shielding electrode 3. And (3) filling the main insulating core in the state into a mould, spraying a coupling agent on the surface, and injecting or mould-pressing silicon rubber to finally form the insulating part which is free of physical interface and air gap and wraps the shielding electrode main part 3 and the semiconductor rubber 4 by the silicon rubber umbrella cover.
The main insulating pipe 1 is made of high electric strength insulating pipe, and the material of the main insulating pipe is pultrusion glass fiber reinforced plastics, or epoxy resin, polyurethane or polytetrafluoroethylene.
The current-carrying conducting rod part 6 can be made of copper materials or aluminum materials, can be arranged in the main insulating tube 1 in a penetrating mode, is provided with a gap, and is filled with semiconductor materials or carbon fiber materials to form the high-voltage shielding electrode 2 of the insulating tube.
Example two
Based on the first embodiment, for the voltage class of 110kV and above, the structure of the ground potential shielding electrode 3 shown in fig. 2 may be adopted, that is, the shielding electrode has an aluminum alloy lining skeleton in the middle, and the whole is made of a semiconductor material by casting and curing.
The semiconductor material can be epoxy resin-impregnated carbon fiber, or can be semiconductor resin, semiconductor rubber or other low-resistance materials with adhesive property and curing property.
EXAMPLE III
For the insulation structure, two-stage (or multi-stage) series connection is adopted, as shown in fig. 3, namely, the main insulation is formed by connecting two stages of capacitors 1.1 and a main insulation tube 1.2 in series, the grounding electrode can adopt the structure of the ground potential shielding electrode 3 disclosed by the second embodiment, the metal positioning ring 9 is used for fixing the insulation tube through uniform voltage division of each stage of capacitor, and thus the highest voltage of the product can reach 500kV or higher.
In an insulation structure adopting two-stage (or multi-stage) series connection, a measurement terminal device 8 similar to a traditional capacitance sleeve is added on a mounting flange 7, a main insulation tube 1.2 is not directly grounded, a layer of insulation 11 is continuously wound or solidified outside a ground potential shielding electrode 3, then a layer of carbon fiber 12 impregnated with epoxy resin is continuously wound on the surface of the insulation 11 to be used as a grounding auxiliary screen (the length is determined according to the sleeve BCT), and finally the auxiliary screen is bonded with the mounting flange 7. The rear mounting flange 7 and the carbon fibers 12 are kept short-circuited through bonding, and the ground potential shielding electrode 3 and the carbon fibers 12 are kept insulated. A lead wire 10 is led out from the ground potential shielding electrode 3 and is connected with a measuring terminal device 8 to be used as a signal for insulation test tests of partial discharge, dielectric loss, capacitance and the like of products.
Example four
This example illustrates the structure of the present invention by taking a typical 40.5kV transformer bushing as an example.
Firstly, the insulating tube is made of extruded glass fiber reinforced plastic, a circular tube with the inner diameter of 60mm, the outer diameter of 100mm and the length of 675mm is selected, and a capacitive screen is not arranged inside the insulating tube.
Then, a groove with the depth of about 0.5mm and the width of about 150mm is turned upwards at the position 135mm away from the bottom of the oil middle side on the outer side of the insulation. The grooves are wound with epoxy impregnated carbon fibers as the main part of the grounded shield electrode, the dimensions of which are shown in fig. 4.
Selecting a 58-diameter red copper rod, welding a wiring terminal at the tail part, and processing the head part into a conducting rod according to the design requirement. And winding the conductive rod with carbon fiber impregnated with epoxy resin, wherein the outer diameter of the conductive rod is less than 60 mm. Penetrating into the inner cavity of the insulating tube immediately, and then putting into an oven for curing. Finally, the conducting rod, the carbon fiber layer and the inner wall of the insulating tube are bonded into a whole, and the carbon fiber layer is the high-voltage shielding electrode.
Then, a semi-vulcanized O-ring rubber was fitted to the air-side end of the main portion of the outer-wall ground-shield electrode. And spraying a coupling agent on the surfaces of the insulating tube and the rubber ring, filling the insulating tube and the rubber ring into a mold, injecting a silicon rubber material, and finally forming the main insulator of the sleeve through high-temperature vulcanization, as shown in figure 5.
And finally, gluing the flange, installing a cover plate at the head part, installing a sealing ring, locking by using parts such as a nut and the like, and finally assembling an air side wiring terminal.
EXAMPLE five
The embodiment is a 126kV transformer bushing, as shown in FIG. 6, the total length of an insulating tube is about 2000 mm, the length of a grounding part (a part filled with BCT) is about 400 mm, the length of insulation in oil is about 350 mm, the height of a flange is about 100mm, and a measuring terminal is arranged on the flange and used for taking signals in an insulation test. The inner diameter of the tube is 45 mm, the outer diameter is 110 mm, and the grounding shielding electrode adopts the structure shown in the figure 2.
EXAMPLE six
The embodiment is a 252kV transformer bushing, the 252kV transformer bushing adopts a two-stage series structure, the two-stage series structure is specifically implemented on the basis of a 126kV product, an insulating tube with the inner diameter of about 112 mm and the outer diameter of about 180 mm is additionally arranged on the outer circumference, and the overall structure of the two-stage series structure is similar to that shown in FIG. 3. If the product voltage level exceeds 252kV, the main insulating pipes can be connected in series in multiple stages, and the highest product voltage can be 500kV or higher.
EXAMPLE seven
The embodiment is a product with the voltage class of 10kV or below, as shown in fig. 7, the structure and the process of the high-voltage electrode are kept unchanged, the grounding electrode can be simplified, and the grounding electrode can be directly bonded with the insulating pipe by using a metal flange. An R arc groove is formed in the upper end of the flange, and the R arc is directly wrapped by silicon rubber injection to improve the electric field distribution at the position.
Compared with the traditional sleeve, the series products of the invention have light weight, small volume and lower relative manufacturing cost; meanwhile, the method has the advantages of no pollution, higher mechanical strength and no risk of explosion and fire. The invention completely changes the cognition of the traditional sleeve manufacturing, is revolutionary change and is a completely updated product.
The foregoing is only a preferred embodiment of this invention and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the invention and these modifications should also be considered as the protection scope of the invention.
Claims (5)
1. A novel dry-type sleeve for an electric power system is characterized in that: the ground potential shielding electrode comprises a main insulating pipe (1), a semiconductor shielding layer (2), semiconductor rubber (4), a silicon rubber umbrella sleeve (5), a current-carrying conducting rod component (6) and a mounting flange (7), wherein the current-carrying conducting rod component (6) is arranged in the main insulating pipe (1) in a penetrating mode, the semiconductor shielding layer (2) is arranged between an inner cavity of the main insulating pipe (1) and the current-carrying conducting rod component (6), carbon fibers impregnated with epoxy resin are arranged on the outer wall of the main insulating pipe (1) to form a ground potential shielding electrode (3), the mounting flange (7) is arranged on the outer side of the ground potential shielding electrode (3), the semiconductor rubber (4) is mounted at the end of the ground potential shielding electrode (3), and the silicon rubber umbrella sleeve (5) and the semiconductor rubber (4) are solidified on the outer wall of the main insulating pipe (1) together.
2. The new dry bushing for electric power system as claimed in claim 1, wherein: the main insulating pipe (1) is made of pultruded glass fiber reinforced plastic or epoxy resin or polyurethane or polytetrafluoroethylene.
3. The new dry bushing for electric power system as claimed in claim 1, wherein: semi-vulcanized semiconductor rubber (4) is arranged at the end part of the ground potential shielding electrode (3) on the air side, and after the silicon rubber umbrella cover (5) is injected or molded, the semi-vulcanized semiconductor rubber (4) and the silicon rubber umbrella cover (5) are solidified on the outer wall of the main insulating tube (1).
4. The new dry bushing for electric power system as claimed in claim 1, wherein: and a lining framework is arranged inside the ground potential shielding electrode (3).
5. The new dry bushing for electric power system as claimed in claim 4, wherein: the lining framework is made of aluminum alloy, and is cast and solidified with a semiconductor material to form a ground potential shielding electrode (3).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110575591.5A CN113643863A (en) | 2021-05-26 | 2021-05-26 | Novel dry-type sleeve for electric power system |
| PCT/CN2021/109649 WO2022247008A1 (en) | 2021-05-26 | 2021-07-30 | Novel dry bushing for electric power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110575591.5A CN113643863A (en) | 2021-05-26 | 2021-05-26 | Novel dry-type sleeve for electric power system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113643863A true CN113643863A (en) | 2021-11-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110575591.5A Pending CN113643863A (en) | 2021-05-26 | 2021-05-26 | Novel dry-type sleeve for electric power system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN113643863A (en) |
| WO (1) | WO2022247008A1 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE429907B (en) * | 1978-09-13 | 1983-10-03 | Asea Ab | ELECTRIC HIGH-VOLTAGE THROUGH FOR A METAL COVER SHEET, PRESSURE GAS INSULATED SWITCH |
| CN2509688Y (en) * | 2001-12-08 | 2002-09-04 | 弥璞 | Composite casing high voltage bushing |
| CN201038679Y (en) * | 2007-04-29 | 2008-03-19 | 山东远见电气有限公司 | Compacitor type composite insulation dry type wall-penetrating bushing |
| CN204991304U (en) * | 2015-10-20 | 2016-01-20 | 山东辰祥电气设备有限公司 | Synthetic fiber reinforced resins high -tension bushing |
| CN209015865U (en) * | 2018-12-17 | 2019-06-21 | 西安神电高压电器有限公司 | A kind of dry sleeve |
| CN112420290B (en) * | 2020-10-12 | 2022-09-16 | 中国南方电网有限责任公司超高压输电公司贵阳局 | Integrated pure-dry high-voltage bushing with mounting flange insulation structure and manufacturing method thereof |
| CN215342160U (en) * | 2021-05-26 | 2021-12-28 | 江苏智达高压电气有限公司 | Novel dry-type sleeve for electric power system |
-
2021
- 2021-05-26 CN CN202110575591.5A patent/CN113643863A/en active Pending
- 2021-07-30 WO PCT/CN2021/109649 patent/WO2022247008A1/en active Application Filing
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| Publication number | Publication date |
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| WO2022247008A1 (en) | 2022-12-01 |
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