CN111711148A - Sliding adjustable three-phase common-bin metal-enclosed power transmission line structure of star insulator - Google Patents
Sliding adjustable three-phase common-bin metal-enclosed power transmission line structure of star insulator Download PDFInfo
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- CN111711148A CN111711148A CN202010576781.4A CN202010576781A CN111711148A CN 111711148 A CN111711148 A CN 111711148A CN 202010576781 A CN202010576781 A CN 202010576781A CN 111711148 A CN111711148 A CN 111711148A
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- cross arm
- insulator
- cylinder
- transmission line
- barrel
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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
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/05—Suspension arrangements or devices for electric cables or lines
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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
- H01B17/14—Supporting insulators
- H01B17/16—Fastening of insulators to support, to conductor, or to adjoining insulator
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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
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/02—Devices for adjusting or maintaining mechanical tension, e.g. take-up device
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Abstract
The invention discloses a star-shaped insulator sliding adjustable three-phase co-warehouse metal closed power transmission line structure, which comprises cross arm insulators which are installed in a closed power transmission line cylinder in a triangular mode, wherein the adjacent ends of the cross arm insulators are fixed through connecting plates, the cross arm insulators on one side of the cylinder fixedly connect the connecting plates with the cylinder through fixing parts, the cross arm insulators on the other side of the cylinder are in sliding fit with the cylinder through rotating parts, channels for penetrating conductors in the cylinder are formed in the middle of the cross arm insulators, particle traps are arranged between the cross arm insulators and the cylinder, the particle traps matched with the slidable cross arm insulators are provided with mounting grooves, openings of the mounting grooves face the inner wall of the cylinder and are fixed with the connecting plates, the mounting grooves in the top are used for arranging grounding devices, and the mounting grooves in the two sides of the bottom are used. The invention aims to provide an insulation structure capable of adjusting the distance between three-phase common-bin structures in a sliding manner.
Description
Technical Field
The invention relates to the field of power transmission equipment, in particular to a star-shaped insulator sliding adjustable three-phase common-bin metal closed power transmission line structure.
Background
The three-phase common-bin GIL structure is mainly used in 252kV and below voltage classes, and a conductor is mainly supported by a supporting insulator or a basin-type insulator. In recent years, part of manufacturers have developed a three-phase common-bin type three-support fixing structure, but the fixing structure is only applied to a GIS bus unit of a transformer substation and is not applied to a long-distance GIL, the fixing support structure is mainly welded on a shell through a connecting plate and is only limited to a fixing three-support structure, and due to the influence of conductor deflection, the support distance is generally less than 5m when two ends of the fixing support structure are supported by basin insulators, so that the length of the standard units of the GIS and the GIL is limited. Due to the limitation of the inner diameter of the cylinder body and the welding process, the fixed points are mostly distributed on the edge of the flange, and the fixed points cannot be arranged at any position of the cylinder body. This mode has increased the flange butt joint face and has increased the risk of gas leakage, and processing technology is loaded down with trivial details. As the GIS bus unit is generally smaller than 7.5 meters, a sliding type supporting structure is not needed, and the sliding type supporting structure is not designed and applied. The GIL long distance transmission characteristics determine the GIL cell length to reduce flange interface. GIL standard cells are typically larger than 12 meters, and existing fixed support structures are prone to increased air leakage risk due to the addition of flange interface surfaces. Therefore, there is a need for an insulation structure that can slide and adjust the distance between three-phase common-bin structures on the basis of an original fixed structure, so as to reduce the sealing surface of flange butt joint and reduce the risk of air leakage.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an insulation structure which can adjust the distance between three-phase common-bin structures in a sliding manner on the basis of the original fixed structure, so that the butt joint sealing surfaces of flanges are reduced, and the air leakage risk is reduced.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a star-shaped insulator sliding adjustable three-phase co-bin metal closed power transmission line structure comprises cross arm insulators which are installed in a closed power transmission line cylinder in a triangular mode, wherein the adjacent ends of the cross arm insulators are fixed through connecting plates, the cross arm insulators on one side of the cylinder fixedly connect the connecting plates with the cylinder through fixing parts, the cross arm insulators on the other side of the cylinder are in sliding fit with the cylinder through rotating pieces, channels for penetrating conductors in the cylinder are formed in the middle of the cross arm insulators, particle traps are arranged between the cross arm insulators and the cylinder, the particle traps matched with the slidable cross arm insulators are provided with mounting grooves, openings of the particle traps face the inner wall of the cylinder and are fixed with the connecting plates, the mounting grooves in the top are used for arranging grounding devices, and the mounting grooves in the two sides of the bottom are used for; the grounding device comprises a fixed sleeve sleeved in the mounting groove and a grounding contact electrode which is inserted in the fixed sleeve and is abutted against the cylinder, and a spring positioned between the grounding contact electrode and the mounting groove is arranged in the fixed sleeve in a penetrating manner; the particle catcher is made into a cylindrical structure by an aluminum plate, and the bottom of the particle catcher is provided with grid holes corresponding to the cross arm insulators.
Furthermore, the fixing part is composed of a limiting pad which is arranged on the connecting plate and is in tight fit with the cylinder body, and a fixing plate which fixes the particle catcher and the cylinder body.
Furthermore, the rotating part is composed of a ball in sliding fit with the cylinder body and a rolling shaft for supporting the ball in the mounting groove.
Furthermore, the fixing sleeve is made of organic materials.
Further, the ground contact is made of graphite or a graphite alloy.
Compared with the prior art, the invention has the following beneficial effects:
1. compared with the existing GIS basin-type insulator, the three-phase cabin-sharing star-type insulating support structure can flexibly support longer conductors, the length of a standard unit is increased in a mode that a fixed cross arm insulator is arranged at one end in a cylinder body, two to three slidable cross arm insulators are strung in the cylinder body according to the length of the conductors, and the length of the standard unit can be changed by adjusting the slidable cross arm insulators. The mode reduces the number of the butt joint surfaces of the flanges, reduces the air leakage probability, and has great significance for reducing the cost of the long-distance transmission bus and increasing the productivity efficiency. And a particle catcher is added to each cross arm insulator combination, so that particles which can cause discharge near the cross arm insulator can be caught, an insulating surface is protected, and the probability of creeping discharge is reduced.
2. Compared with a basin-type insulator, the relative creepage distance between the conductors penetrating through the inner conductor of the cross arm insulator is doubled, and the creepage path of interphase discharge must pass through the ground potential, so that the discharge is preferentially carried out relatively, the power grid trips, the relative discharge between the conductors is avoided, and the risk of the power grid is reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a fixed cross arm insulator according to the present invention;
FIG. 3 is a side view of the structure of FIG. 2;
FIG. 4 is a schematic structural view of a slidable cross arm insulator according to the present invention;
FIG. 5 is a side view of the structure of FIG. 4;
FIG. 6 is a schematic structural diagram of the grounding device of the present invention;
FIG. 7 is a schematic view of a rotating member according to the present invention;
FIG. 8 is a schematic diagram of a discharge path according to the present invention.
Description of reference numerals:
1-cylinder, 2-conductor, 3-particle catcher, 4-grounding device, 5-conductor relative discharge path, 6-conductor relative ground discharge path, 11-fixed part, 12-cross arm insulator, 13-rotating part, 31-mounting groove, 32-grid hole, 41-grounding contact, 42-spring, 43-fixing sleeve, 111-limiting pad, 112-fixed plate, 113-connecting plate, 131-ball and 132-rolling shaft.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 to 7, a star-shaped insulator sliding adjustable three-phase common-bin metal closed power transmission line structure comprises cross arm insulators 12 installed in a triangular shape in a closed power transmission line cylinder 1, wherein adjacent ends of the cross arm insulators 12 are fixed through a connecting plate 113, the cross arm insulators 12 on one side of the cylinder 1 fixedly connect the connecting plate 113 with the cylinder 1 through a fixing part 11, the cross arm insulators 12 on the other side of the cylinder 1 are in sliding fit with the cylinder 1 through a rotating part 13, a channel for penetrating a conductor 2 in the cylinder 1 is formed in the middle of each cross arm insulator 12, particle traps 3 are arranged between the cross arm insulators 12 and the cylinder 1, the particle traps 3 matched with the slidable cross arm insulators 12 are provided with mounting grooves 31 with openings facing the inner wall of the cylinder 1 and fixed with the connecting plate 113, the mounting grooves 31 on the top are used for arranging grounding devices 4, the mounting grooves 31 positioned at the two sides of the bottom are used for arranging the rotating piece 13; the grounding device 4 comprises a fixed sleeve 43 sleeved in the mounting groove 31 and a grounding contact electrode 41 inserted in the fixed sleeve 43 and abutted against the cylinder 1, and a spring 42 positioned between the grounding contact electrode 41 and the mounting groove 31 penetrates through the fixed sleeve 43; the particle catcher 3 is made into a cylindrical structure by an aluminum plate, and the bottom of the particle catcher is provided with a grid hole 32 corresponding to the cross arm insulator 12; the rotation member 13 is composed of a ball 131 slidably engaged with the cylinder 1 and a rolling shaft 132 supporting the ball 131 in the mounting groove 31.
The fixing part 111 is composed of a limiting pad 111 which is over tightly matched with the cylinder body 1 on a connecting plate 113, and a fixing plate 112 which fixes the particle catcher 3 and the cylinder body 1, the fixing plate 112 and the cylinder body 1 are fixed by welding, and the limiting pad 111 is tightly pressed with the cylinder body 1 by tight fit, so that the position of the cross arm insulator supporting structure is locked and fixed.
The fixing sleeve 43 is made of an organic material, and nylon or polytetrafluoroethylene can be used in the embodiment, so that the fixing sleeve 43 is in contact with metal to have a lubricating effect, and the cylinder body is prevented from being scratched in the moving process. The grounding contact 41 is made of graphite or graphite alloy, so that good electrical contact with the cylinder 1 is guaranteed, and meanwhile, the grounding contact has strong wear resistance and cannot generate fragments due to friction in the movement process.
The three-phase cross arm insulator supporting structure adopts three separately poured cross arm insulators 12, and the three cross arm insulators 12 are mutually fixed and connected through the connecting plate 113, so that a stable and firm space conductor supporting mode is realized. The cross arm insulator supporting structure forms a regular triangle structure, the conductor 2 is arranged in an inverted triangle form, the central conductor penetrates into the cross arm supporting structure, and the conductor 2 and each cross arm insulator 12 are fixed in a welding, crimping or riveting mode.
The fixed cross arm insulator and the sliding cross arm insulator supporting structure are assembled with the conductor 2 integrally and then are arranged in the cylinder body 1 for filling SF6、N2And SF6The mixed gas and other insulating gases are sealed, so that the process is simplified, and the cross arm insulator 12 is lighter and convenient to transport and assemble. Aiming at the supporting structure of the sliding cross arm insulator, the top of the supporting structure is contacted with the cylinder body 1 through a grounding contact 41 tightly pressed with the cylinder body 1, and the spring 42 at the bottom of the grounding contact 41 is communicated with the particle catcher 3, so that the grounding contact 41, the spring 42, the cylinder body 1, the particle catcher 3 and four parts form an electrically communicated equivalent potential body, and the particle catcher 3 is ensured to be well grounded; the bottom part is in sliding fit with the cylinder body 1 through two rotating parts 13 consisting of rolling shafts 132 and rolling balls 131, so that the sliding cross arm insulator supporting structure can be displaced along with the expansion and contraction of the conductor 2, the moving resistance is reduced, the error in the installation process can be effectively compensated, and the thermal expansion or mechanical strain compensation is provided in the GIL operation process. The particle catcher 3 is added into the two supporting structures, metal particles can be collected by utilizing the Faraday cage principle, and the insulation reliability of the extra-high voltage GIL is improved. The grid holes 32 are formed in the bottom of the particle catcher 3, so that particles of different sizes and different materials can be guaranteed to be trapped in a shielding area between the particle catcher 3 and the barrel, the particles cannot escape after long-term operation, and insulation accidents caused by the particles can be effectively controlled.
As shown in fig. 8, the conductor-to-ground discharge path 5 and the conductor-to-ground discharge path 6 are shown, the relative creepage distance between the conductors 2 in the present invention is much longer than the straight distance to the ground, and compared with the existing common three-phase common-bin basin structure, the creepage distance along the surface of the cross arm insulator 12 is increased, and the insulation strength of the relative ground is increased. The relative creepage distance between the conductors 2 is twice of the relative earth distance of the conductors 2, so that the interphase discharge is effectively prevented, and the single-phase discharge is prevented from developing into the interphase discharge.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. The utility model provides a star type insulator slides adjustable three-phase and altogether storehouse metal enclosed transmission line structure, includes the cross arm insulator that is the triangle-shaped installation in the confined transmission line barrel, its characterized in that: the device comprises a barrel, a cross arm insulator, a connecting plate, a rotating part, a channel, a particle catcher, a grounding device and a grounding device, wherein the adjacent ends of the cross arm insulators are fixed through the connecting plate, the cross arm insulator on one side of the barrel fixedly connects the connecting plate with the barrel through the fixing part, the cross arm insulator on the other side of the barrel is in sliding fit with the barrel through the rotating part, the middle part of the cross arm insulator is provided with the channel for penetrating a conductor in the barrel, the particle catcher is arranged between the cross arm insulator and the barrel, the particle catcher matched with the slidable cross arm insulator is provided with mounting grooves with openings facing the inner wall of the barrel and fixed with the connecting plate; the grounding device comprises a fixed sleeve sleeved in the mounting groove and a grounding contact electrode which is inserted in the fixed sleeve and is abutted against the cylinder, and a spring positioned between the grounding contact electrode and the mounting groove is arranged in the fixed sleeve in a penetrating manner; the particle catcher is made into a cylindrical structure by an aluminum plate, and the bottom of the particle catcher is provided with grid holes corresponding to the cross arm insulators.
2. The star insulator sliding adjustable three-phase common-bin metal closed power transmission line structure of claim 1, which is characterized in that: the fixing part consists of a limiting pad which is arranged on the connecting plate and is in tight fit with the cylinder body, and a fixing plate which fixes the particle catcher and the cylinder body.
3. The star insulator sliding adjustable three-phase common-bin metal closed power transmission line structure of claim 1, which is characterized in that: the rotating part is composed of a ball in sliding fit with the cylinder body and a rolling shaft for supporting the ball in the mounting groove.
4. The star insulator sliding adjustable three-phase common-bin metal closed power transmission line structure of claim 1, which is characterized in that: the fixing sleeve is made of organic materials.
5. The star insulator sliding adjustable three-phase common-bin metal closed power transmission line structure of claim 1, which is characterized in that: the ground contact is composed of graphite or a graphite alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010576781.4A CN111711148A (en) | 2020-06-22 | 2020-06-22 | Sliding adjustable three-phase common-bin metal-enclosed power transmission line structure of star insulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010576781.4A CN111711148A (en) | 2020-06-22 | 2020-06-22 | Sliding adjustable three-phase common-bin metal-enclosed power transmission line structure of star insulator |
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| Publication Number | Publication Date |
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| CN111711148A true CN111711148A (en) | 2020-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010576781.4A Pending CN111711148A (en) | 2020-06-22 | 2020-06-22 | Sliding adjustable three-phase common-bin metal-enclosed power transmission line structure of star insulator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112909882A (en) * | 2021-03-10 | 2021-06-04 | 广东电网有限责任公司电力科学研究院 | Inside metal particle adsorption equipment of GIL |
| CN116759973A (en) * | 2023-08-16 | 2023-09-15 | 江苏安靠智能输电工程科技股份有限公司 | Novel environment-friendly 550kV gas rigid power transmission line |
-
2020
- 2020-06-22 CN CN202010576781.4A patent/CN111711148A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112909882A (en) * | 2021-03-10 | 2021-06-04 | 广东电网有限责任公司电力科学研究院 | Inside metal particle adsorption equipment of GIL |
| CN116759973A (en) * | 2023-08-16 | 2023-09-15 | 江苏安靠智能输电工程科技股份有限公司 | Novel environment-friendly 550kV gas rigid power transmission line |
| CN116759973B (en) * | 2023-08-16 | 2023-12-05 | 江苏安靠智能输电工程科技股份有限公司 | Novel environment-friendly 550kV gas rigid power transmission line |
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