CN111711148A - A star-shaped insulator sliding adjustable three-phase common storage metal-enclosed transmission line structure - Google Patents

Abstract

The invention discloses a star-shaped insulator sliding and adjustable three-phase common storage metal-enclosed transmission line structure, comprising cross-arm insulators installed in a triangular shape in a closed transmission line cylinder, and adjacent ends of the cross-arm insulators are connected by The plates are fixed, the cross-arm insulator on one side of the cylinder body is fixedly connected to the connecting plate and the cylinder body through the fixing part, the cross-arm insulator on the other side of the cylinder body is slidingly matched with the cylinder body through the rotating part, and the middle of the cross-arm insulator is opened for Conductor passages run through the cylinder, particle catchers are arranged between the cross-arm insulator and the cylinder, and the particle catchers matched with the slidable cross-arm insulators all have installations with openings facing the inner wall of the cylinder and fixed with the connecting plate The installation groove on the top is used to set the grounding device, and the installation groove on both sides of the bottom is used to set the rotating parts. The present invention aims to provide an insulating structure capable of slidingly adjusting the distance between the three-phase common warehouse structures.

Description

A star-shaped insulator sliding adjustable three-phase common storage metal-enclosed transmission line structure

technical field

The invention relates to the field of power transmission equipment, in particular to a star-shaped insulator sliding and adjustable three-phase common warehouse metal-enclosed power transmission line structure.

Background technique

The three-phase common warehouse GIL structure is mostly used in voltage levels of 252kV and below, and the conductors are mainly supported by supporting insulators or pot insulators. In recent years, some manufacturers have developed a three-phase common warehouse type three-support fixed structure, but it is only used in the GIS busbar unit of the substation, and has not been used in the long-distance GIL. The fixed support structure is mainly welded on the shell through the connecting plate. And it is limited to the fixed three-support structure. Due to the influence of the conductor deflection, the support distance is generally less than 5m when the two ends are supported by basin insulators, thus restricting the length of the standard unit of GIS and GIL. Due to the limitation of the inner diameter of the cylinder and the welding process, the fixed points are mostly distributed on the edge of the flange, and it is impossible to set the fixed point at any position of the cylinder. This method increases the risk of air leakage on the flange butt surface, and the processing technology is cumbersome. Since the GIS busbar unit is generally less than 7.5 meters, there is no need to set up a sliding support structure, so the sliding support structure has not been designed and applied. GIL long-distance power transmission characteristics determine the length of the GIL unit to reduce the flange butt surface. The GIL standard unit is generally larger than 12 meters, and the existing fixed support structure is prone to increase the risk of air leakage due to the increase of flange butt surfaces. Therefore, there is an urgent need for an insulating structure that can slide and adjust the distance between the three-phase co-silo structures on the basis of the original fixed structure, thereby reducing the sealing surface of the flange butting and reducing the risk of air leakage.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and to provide an insulating structure that can slide and adjust the distance between the three-phase common warehouse structures on the basis of the original fixed structure, thereby reducing the sealing of flange butt joints. face to reduce the risk of air leakage.

In order to achieve the above object, the technical scheme of the present invention is achieved in this way:

A star-shaped insulator sliding and adjustable three-phase common warehouse metal enclosed transmission line structure comprises cross-arm insulators installed in a triangular shape in a closed transmission line cylinder, and the adjacent ends of the cross-arm insulators are fixed by connecting plates. The cross-arm insulator on one side of the cylinder body is fixedly connected to the connecting plate and the cylinder body through the fixing part, the cross-arm insulator on the other side of the cylinder body is slidingly matched with the cylinder body through the rotating part, and the middle of the cross-arm insulator is provided with a hole for passing through the cylinder body. Conductor channel, particle catchers are arranged between the cross arm insulator and the cylinder body, and the particle catchers matched with the slidable cross arm insulators all have installation grooves with openings facing the inner wall of the cylinder and fixed with the connecting plate, located at the top The installation groove is used to set the grounding device, and the installation grooves on both sides of the bottom are used to set the rotating parts; the grounding device includes a fixed sleeve sleeved in the installation groove, and a grounding contact inserted in the fixed sleeve and abutting against the cylinder The fixed sleeve is provided with a spring located between the ground contact and the installation slot; the particle catcher is made of an aluminum plate into a cylindrical structure, and a grid hole corresponding to the cross arm insulator is opened at the bottom.

Further, the fixing member is composed of a limit pad that is tightly fitted with the cylinder on the connecting plate, and a fixing plate that fixes the particle catcher and the cylinder.

Further, the rotating member is composed of balls slidably matched with the cylinder body and rolling shafts supporting the balls in the installation groove.

Further, the fixing sleeve is made of organic material.

Further, the ground contact is made of graphite or graphite alloy.

Compared with the prior art, the present invention has the following beneficial effects:

1. Compared with the existing GIS basin insulator, the three-phase co-silo star-shaped insulating support structure of the present invention can flexibly support longer conductors. The length of the standard unit is increased by stringing two or three slidable cross-arm insulators in the cylinder, and the length of the standard unit can be changed by adjusting the sliding cross-arm insulators. This method reduces the number of flange butt surfaces and reduces the probability of air leakage, which is of great significance for reducing the cost of long-distance transmission busbars and increasing production efficiency. A particle catcher is also added to each cross-arm insulator combination, which can capture particles that can cause discharge near the cross-arm insulator, protect the insulating surface, and reduce the probability of creeping discharge.

2. Compared with the basin-type insulator, the relative creepage distance between the conductors passing through the inner conductor of the cross-arm insulator is doubled, and the creepage path of the interphase discharge must pass through the ground potential, so the relative discharge is prioritized and the power grid is tripped. , to avoid the formation of relative discharge between conductors and reduce the risk of the power grid.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the structural representation of fixed cross arm insulator in the present invention;

Fig. 3 is the side view structure schematic diagram of Fig. 2;

4 is a schematic structural diagram of a slidable cross arm insulator in the present invention;

Fig. 5 is the side view structure schematic diagram of Fig. 4;

6 is a schematic structural diagram of a grounding device in the present invention;

Fig. 7 is the structural representation of the rotating part in the present invention;

FIG. 8 is a schematic structural diagram of the discharge path of the present invention.

Description of reference numbers:

1-Cylinder, 2-Conductor, 3-Particle catcher, 4-Grounding device, 5-Conductor relative discharge path, 6-Conductor relative discharge path, 11-Fixed part, 12-Cross arm insulator, 13-Rotating part , 31-Installation slot, 32-Grid hole, 41-Ground contact pole, 42-Spring, 43-Fixing sleeve, 111-Limit pad, 112-Fixing plate, 113-Connecting plate, 131-Ball, 132-Rolling axis.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

As shown in FIGS. 1 to 7 , a star-shaped insulator sliding adjustable three-phase common storage metal-enclosed transmission line structure includes cross-arm insulators 12 installed in a triangular shape in the closed transmission line cylinder 1. The cross-arm insulators 12 The adjacent ends of the insulator 12 are fixed by the connecting plate 113. The cross-arm insulator 12 on one side of the cylindrical body 1 is fixedly connected to the connecting plate 113 and the cylindrical body 1 through the fixing member 11, and the cross-arm insulator 12 on the other side of the cylindrical body 1 is connected. Through the sliding fit between the rotating member 13 and the cylinder body 1, a channel for piercing the conductor 2 in the cylinder body 1 is opened in the middle of the cross arm insulator 12, and a particle catcher 3 is arranged between the cross arm insulator 12 and the cylinder body 1. The particle traps 3 matched with the slidable cross-arm insulator 12 all have installation grooves 31 whose openings face the inner wall of the cylinder 1 and are fixed with the connecting plate 113. The installation grooves 31 at the top are used to set the grounding device 4 and are located on both sides of the bottom. The installation groove 31 of the 1 is used to set the rotating member 13; the grounding device 4 includes a fixed sleeve 43 sleeved in the installation groove 31, and a grounding contact pole 41 inserted in the fixed sleeve 43 against the cylinder 1, the fixed sleeve 43 A spring 42 located between the grounding contact 41 and the installation slot 31 is penetrated inside; the particle catcher 3 is made of an aluminum plate into a cylindrical structure, and a grid hole 32 corresponding to the cross arm insulator 12 is opened at the bottom ; The rotating member 13 is composed of a ball 131 slidably matched with the cylinder body 1 and a rolling shaft 132 that supports the ball 131 in the installation groove 31 .

The fixing member 111 is composed of a limit pad 111 that is tightly fitted with the cylinder body 1 on the connecting plate 113, and a fixing plate 112 that fixes the particle catcher 3 and the cylinder body 1. The fixing plate 112 is connected to the cylinder body 1. 1 are fixed by welding, and the limit pad 111 is pressed against the cylinder body 1 by tight fitting, thereby locking and fixing the position of the cross arm insulator support structure.

Wherein, the fixing sleeve 43 is made of organic material. In this embodiment, nylon or polytetrafluoroethylene can be used, so that the contact between the fixing sleeve 43 and the metal has a lubricating effect and prevents the cylinder from being scratched during the movement. The grounding contact 41 is made of graphite or graphite alloy. While ensuring good electrical contact with the cylinder body 1 , it has strong wear resistance during movement and will not generate debris due to friction.

The three-phase cross-arm insulator support structure in the present invention adopts three separately cast cross-arm insulators 12, and the three cross-arm insulators 12 are fixed and connected to each other through the connecting plate 113, so as to realize a stable and firm space conductor support mode. The cross-arm insulator support structure is a regular triangle structure, the conductors 2 are arranged in an inverted triangle shape, the center conductor penetrates into the cross-arm support structure, and the conductor 2 and each cross-arm insulator 12 are fixed by welding, crimping or riveting.

Both the fixed cross-arm insulator and the sliding cross-arm insulator support structure are assembled with the conductor 2, and then put into the cylinder 1 to be filled with insulating gases such as SF ₆ , N ₂ and SF ₆ mixed gas and sealed, which simplifies the process, and the horizontal The insulator 12 is also lighter, which is convenient for transportation and assembly. For the sliding cross arm insulator support structure, the top is in contact with the cylinder 1 through the ground contact 41 pressed against the cylinder 1, and the spring 42 at the bottom of the ground contact 41 communicates with the particle catcher 3, so that the ground contact 41 , the spring 42, the cylinder 1 and the particle catcher 3, the four components form an equipotential body with electrical communication, which ensures that the particle catcher 3 is well grounded; 13 is slidingly matched with the cylinder body 1, so that the sliding cross arm insulator support structure can be displaced with the thermal expansion and contraction of the conductor 2, so as to reduce the movement resistance, which can effectively compensate the error of the installation process and provide thermal expansion or thermal expansion during the GIL operation. Mechanical strain compensation. The particle catcher 3 is added to both support structures, and metal particles can be collected by using the Faraday cage principle to improve the insulation reliability of the UHV GIL. The bottom of the particle catcher 3 is provided with grid holes 32 to ensure that particles of different sizes and materials can fall into the shielding area between the particle catcher 3 and the cylinder, and will not escape during long-term operation, which can be effectively controlled Particles cause insulation failures.

As shown in FIG. 8, the conductor-relative discharge path 5 and the conductor-to-ground discharge path 6, in the present invention, the relative creepage distance between the conductors 2 is much larger than the straight-line distance relative to the ground. Compared with the current common three-phase common storage basin structure , which increases the creepage distance along the surface of the cross arm insulator 12 and increases the relative dielectric strength. The relative creepage distance between conductors 2 is twice that of conductors 2 relative to the ground, which effectively prevents phase-to-phase discharge and prevents single-phase discharge from developing into phase-to-phase discharge.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

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.

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