CN215185100U

CN215185100U - High-voltage bushing and high-voltage switch cabinet

Info

Publication number: CN215185100U
Application number: CN202022392457.5U
Authority: CN
Inventors: 张勇; 孙静林; 潘天华; 郭伟
Original assignee: Jinzhou Xirui Electric Appliance Co ltd; Beijing No5 Construction Engineering Group Co ltd
Current assignee: Jinzhou Xirui Electric Appliance Co ltd; Beijing No5 Construction Engineering Group Co ltd
Priority date: 2020-10-23
Filing date: 2020-10-23
Publication date: 2021-12-14
Anticipated expiration: 2030-10-23

Abstract

The utility model provides a high-tension bushing and high tension switchgear, wherein high-tension bushing makes female arranging and high tension switchgear insulation that carries load current, include: the fixing plate is connected to the high-voltage switch cabinet, mounting holes for the busbars to penetrate through are formed in the fixing plate, and umbrella skirts used for blocking load current to generate a closed magnetic field are arranged on two sides of the fixing plate. The utility model provides a high-tension bushing, generate heat according to the peripheral steel sheet of sleeve pipe, and mechanical vibration's principle, through setting up the full skirt, a closed magnetic field for destroying female row medium load current and producing, it is closed to make the magnetic circuit can not directly pass through the steel sheet, but constitute the return circuit through air on every side, it hinders magnetism to increase the return circuit, and then avoid the vortex by its production through destroying closed magnetic field, fundamentally has reduced high-tension bushing's eddy current loss, the temperature that makes high tension switchgear when normal operating reduces by a wide margin, vibration noise has also been eliminated simultaneously, effectively improve high tension switchgear's operational environment.

Description

High-voltage bushing and high-voltage switch cabinet

Technical Field

The utility model relates to an electric power system technical field especially relates to a high-tension bushing and high tension switchgear.

Background

The high-voltage bushing is a device for one or more conductors to pass through a partition such as a wall or a box body and have the functions of insulation and support, is important equipment in a power system, is mainly used for the ground insulation of an incoming and outgoing line of power equipment such as a high-voltage switch cabinet, a transformer, a reactor and a breaker and the like and the penetration of a high-voltage circuit through a wall and the like, and mainly comprises a single medium bushing, a composite medium bushing and the like. During the manufacturing, transporting and overhauling processes of the high-voltage bushing, latent defects may remain due to various reasons; during long-term operation, defects are also gradually generated under the influence of the action of electric fields and conductor heating, mechanical damage and chemical corrosion, and atmospheric conditions.

At present, a high-voltage switch cabinet is mostly in a metal armor type, a high-voltage sleeve adopts a single medium form, and the high-voltage sleeve has the advantages of good sealing performance, high operation reliability and the like, but is easy to generate heat in operation, particularly, metal materials around a wall bushing of a large-capacity switch cabinet generate heat obviously, a cabinet plate vibrates greatly, and high-frequency vibration sound exists in the cabinet. The main insulation of the high-voltage bushing is subject to high voltage during operation, and the main failures of the high-voltage bushing include bushing insulation moisture and pollution, flashover, partial discharge, earth discharge and the like. High voltage bushings are used to insulate and support high voltage conductors passing through barriers (such as walls and metal enclosures for electrical equipment) that are at a different potential than the high voltage conductors. Because the electric field distribution in the sleeve is uneven, particularly, the electric field at the edge of the middle flange is very concentrated, so that the surface sliding and flashing discharge is easily caused. Often, a composite insulating material is used, and problems such as partial discharge exist.

Through a large number of on-site investigation analysis and judgment, the heating of the steel plates around the high-voltage bushing is caused by eddy current generated when load current in the busbar passes through the wall bushing, and the vibration of the cabinet plate is caused by the cabinet plate impacting the frame under the action of electromagnetic force. The load current generates an alternating magnetic field in the steel plate of the wall bushing, and then an induced voltage is generated in the steel plate, and because the steel plate has small resistance, large eddy current is generated in the steel plate to cause heating, and the heating is very obvious when the load current is more than 1000A. Although the switch cabinet manufacturer has taken measures such as slotting at the wall bushing of the cabinet plate and adding an aluminum plate to prevent the generation of eddy current, the cabinet plate is made of metal material and has only 5mm of slot, and the steel plate still generates eddy current to cause heating, so the effect is very little.

SUMMERY OF THE UTILITY MODEL

Problem to prior art existence, the utility model provides a high-tension bushing and high tension switchgear can reduce the peripheral eddy current loss of high-tension bushing, effectively solves the heating and vibration scheduling problem.

The utility model provides a high-voltage bushing makes female arranging and high tension switchgear insulation who carries load current, include: a fixed plate connected to the high-voltage switch cabinet,

the fixing plate is provided with a mounting hole for the busbar to pass through, and umbrella skirts for blocking load current to generate a closed magnetic field are arranged on two sides of the fixing plate.

Further, the high-voltage bushing is embedded and installed on a side plate of the high-voltage switch cabinet.

Furthermore, the fixed plate is vertically connected to the side plates, and the umbrella skirt is connected to the wall surfaces of the two sides of the fixed plate.

Further, the umbrella skirt comprises at least two umbrella skirts which are arranged in a sleeved mode, and the umbrella skirts extend in the direction perpendicular to the fixing plates.

Furthermore, the umbrella skirt comprises first umbrella skirts which are arranged at intervals and located on the inner side and second umbrella skirts which are arranged on the outer side, and the extending tail ends of the second umbrella skirts exceed the extending tail ends of the first umbrella skirts and are used for completely shielding the first umbrella skirts.

Furthermore, the surfaces of the first umbrella skirt and the second umbrella skirt are smooth surfaces.

Furthermore, the extension tail end of the second umbrella skirt limits the busbar so that the shortest discharge distance between the busbar and the side plate is larger than 140 mm.

Further, the fixing plate and the umbrella skirt are integrally formed and are made of epoxy resin.

Further, at least two high voltage bushings are vertically arranged on the side plate, and adjacent high voltage bushings are arranged in a close fit manner.

A high-voltage switch cabinet is provided with the high-voltage bushing, and a busbar vertically penetrates out of the high-voltage switch cabinet through the high-voltage bushing.

The utility model provides a high-tension bushing, generate heat according to the peripheral steel sheet of sleeve pipe, and mechanical vibration's principle, through setting up the full skirt, a closed magnetic field for destroying female row medium load current and producing, it is closed to make the magnetic circuit can not directly pass through the steel sheet, but constitute the return circuit through air on every side, it hinders magnetism to increase the return circuit, and then avoid the vortex by its production through destroying closed magnetic field, fundamentally has reduced high-tension bushing's eddy current loss, the temperature that makes high tension switchgear when normal operating reduces by a wide margin, vibration noise has also been eliminated simultaneously, effectively improve high tension switchgear's operational environment.

Drawings

The present invention will be described in more detail hereinafter based on embodiments and with reference to the accompanying drawings. Wherein:

FIG. 1 is a diagram of the effect of the high-voltage bushing in use and installation;

fig. 2 is a schematic perspective view of a high-voltage bushing according to the present invention;

fig. 3 is a schematic front view of the high-voltage bushing of the present invention;

fig. 4 is a side view profile structure diagram of the middle and high voltage bushing of the present invention.

In the figure: 1-busbar, 2-switch cabinet, 21-side plate, 3-fixing plate, 31-mounting hole, 4-umbrella skirt, 41-first umbrella skirt, 42-second umbrella skirt and 5-embedded nut.

In the drawings, like parts are designated with like reference numerals, and the drawings are not to scale.

Detailed Description

For the purpose of clearly explaining the contents of the present invention, the present invention will be described below with reference to the following embodiments.

In the description of the present invention, it should be noted that the terms "upper", "lower", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1-4, the utility model provides a high-voltage bushing makes female row 1 that carries load current and high tension switchgear 2 insulating, include: connect be in fixed plate 3 on high tension switchgear 2, set up the confession on fixed plate 3 the mounting hole 31 that female row 1 passed, all be provided with full skirt 4 in the both sides of fixed plate 3, full skirt 4 can block the load current who arranges in 1 and produce closed magnetic field.

The umbrella skirt 4 arranged on the fixed plate 3 forms a sleeve structure on the fixed plate 3, effectively destroys a closed-circuit magnetic field generated by load current in the busbar 1, so that a magnetic circuit can not be directly closed through a steel plate on the high-voltage switch cabinet 2, but forms a loop through surrounding air, increases loop reluctance, further prevents the closed-circuit magnetic field from generating eddy current, fundamentally reduces eddy current loss of a high-voltage sleeve, greatly reduces the temperature of the high-voltage switch cabinet 2 during normal operation, simultaneously eliminates mechanical vibration of the steel plate of the high-voltage switch cabinet 2 caused by electromagnetic force, and obviously improves the operation environment of the high-voltage switch cabinet 2. The mounting holes 31 can only accommodate the busbar 1 to pass through, and also increase the shielding area to a certain extent, so that the possibility of forming a closed magnetic field is reduced to the minimum.

The utility model provides a high-pressure sleeve embedding is installed on the curb plate 21 of high tension switchgear 2, is provided with the trompil at

curb plate

21, and 3 concrete laminating of fixed plate are on the lateral wall of curb plate 21, through inlaying nut 5 with 3 vertical connections of fixed plate on curb plate 21. The umbrella skirt 4 is connected on the wall surface of the two sides of the fixed plate 3 to form a shielding structure of the high-voltage bushing on the inner side and the outer side of the switch cabinet 2, and a closed magnetic field formed by load current can be blocked in a three-dimensional space.

The umbrella skirt 4 comprises at least two umbrella skirts which are internally and externally overlapped, the umbrella skirts 4 are arranged on the side walls of two sides of the fixing plate 3, when the umbrella skirts are specifically arranged, the fixing plate 3 is vertically attached to the side plate 21 of the high-voltage switch cabinet 2, the umbrella skirts 4 connected to the side walls of the fixing plate 3 extend along the direction perpendicular to the fixing plate 3, namely the umbrella skirts 4 horizontally extend on the inner side and the outer side of the high-voltage switch cabinet 2, through the arrangement mode, a magnetic field which can be formed by load currents in the busbar 1 at the connecting position of the busbar 1 and the high-voltage switch cabinet 2 can be effectively blocked, and eddy currents formed by the magnetic field are avoided; it should be noted that the umbrella skirts 4 can prolong the creepage distance from the high voltage electricity in the busbar 1 to the side plate 21 of the high-voltage switch cabinet 2, and effectively reduce the risk that the high voltage electricity flashover between the busbar 1 and the side plate 21. Creepage distance is the shortest distance on solid insulation material surface between two conductive parts the utility model discloses in, through a plurality of full skirts 4 that set up, can prolong high-voltage electricity from female arranging 1 to the distance of creepage between 2 metal side plates 21 of high tension switchgear, make full skirt 4 can form insulating isolation, effectively avoid being polarized as the high tension bushing of insulator, and then guarantee high tension switchgear 2's operation safety.

In one embodiment, the sheds 4 include two sheds spaced apart in the radial direction, specifically, a first shed 41 located on the radially inner side, and a second shed 42 located on the radially outer side. In the use of current high-voltage bushing, high-voltage bushing's outside is owing to the deposition, often can receive the spark-over discharge that dust flashover punctures and appear, seriously influences the security that high tension switchgear 2 used. In order to avoid dust accumulation outside the umbrella skirt 4, the outer end of the second umbrella skirt 42, namely the extension end, exceeds the outer end of the first umbrella skirt 41, so that the second umbrella skirt 42 effectively shields the first umbrella skirt 41, dust accumulation on the first umbrella skirt 41 is prevented, and the distance of high-voltage creepage can be prolonged by combining the plurality of umbrella skirts 4, so that the high-voltage creepage can not be carried out any more before the high-voltage creepage reaches the outer surface of the second umbrella skirt 42, and even if a small amount of dust appears on the outer surface of the second umbrella skirt 42, the phenomenon that the dust flashover breaks through to strike fire and discharge can not occur. In order to further reduce the accumulation of dust on the surface of the umbrella skirt 4, the surfaces of the first umbrella skirt 41 and the second umbrella skirt 42 are both smooth surfaces after polishing, so that the dust can be effectively prevented from adhering to the surface of the umbrella skirt 4, and the operation safety is improved.

In this embodiment, the first umbrella skirt 41 and the second umbrella skirt 42 are both disposed on two sides of the fixing plate 3, and form an inner cylinder and an outer cylinder structure of the high voltage bushing on two sides inside and outside the high voltage switch cabinet 2, so that the umbrella skirt 4 can form a shielding structure of the busbar 1 on two sides inside and outside the high voltage switch cabinet 2, and the formation of an electromagnetic loop is prevented spatially.

The umbrella skirt 4 can prolong the creepage distance of high voltage electricity between the busbar 1 and the metal side plate 21, and can effectively increase the shortest discharge distance between the busbar 1 and the side plate 21, wherein the shortest discharge distance is the distance between a charged body and other equipment when the charged body can discharge linearly, through the second umbrella skirt 42 horizontally extending towards the inner side and the outer side of the high-voltage switch cabinet 2, the extending tail end of the second umbrella skirt 42 can be used as a necessary point during high voltage discharge, namely, under the limiting action of the extending tail end of the second umbrella skirt 42 on the busbar, the discharge distance of the high voltage electricity between the busbar 1 and the metal side plate 21 is effectively increased, so that the shortest discharge distance 'L' between the busbar 1 and the metal side plate 21 is larger than 140mm, and the hard requirement that the minimum discharge distance of the high voltage electricity is 125mm is met.

In one preferred embodiment, the fixing plate 3 and the umbrella skirt 4 are of an integral structure and are made of epoxy resin, the manufacturing cost of the high-voltage bushing can be effectively reduced through an integral manufacturing mode, the epoxy resin has good insulating performance and sealing performance and high mechanical strength, and the mounting requirement of the busbar 1 in the high-voltage bushing can be met. The busbar mounting hole 31 on the fixing plate 3 in this embodiment is specifically square, and can be processed into a round shape or other shapes according to actual needs, so that the high-voltage bushing can reliably support the busbar 1.

In one embodiment, the high-voltage bushings are vertically arranged on the side plate 21 of the high-voltage switch cabinet 2, and the high-voltage bushings are closely arranged, so that an electromagnetic loop which can be formed by the metal side plate 21 can be effectively cut off, magnetic lines of force generated by load current are blocked by the adjacent high-voltage bushings, and eddy current is prevented from occurring.

The utility model also provides an install above-mentioned high tension switchgear, female row is worn out perpendicularly through high tension switchgear's insulation and support from high tension switchgear. Through high-voltage bushing, can reduce generating heat of high tension switchgear curb plate to and the mechanical oscillation of cabinet board, effectively prolong high tension switchgear's life.

It should be noted that, in addition to the form of vertical arrangement on the side plate of the high-voltage switch cabinet, the high-voltage bushings can also be closely arranged in a shape like a Chinese character pin, and the technical effect of blocking the load current in the busbar to generate a closed magnetic circuit can also be achieved; besides being applied to a high-voltage switch cabinet, the high-voltage bushing can also be used for blocking high-voltage current to generate a closed magnetic circuit in the transformation and distribution industry, thereby reducing other working conditions of eddy current loss; high-voltage bushing still can install on the roof of cubical switchboard, makes female arranging vertically wear out under high-voltage bushing's insulating and supporting role, can reach destruction closed magnetic field equally, avoids appearing the technical purpose of vortex, and this also is this technical field personnel can the utility model discloses the conventional setting of making on the technical scheme basis, here is no longer repeated.

Finally, it is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention, and these changes and modifications are to be considered as the protection scope of the invention.

Claims

1. A high-voltage bushing for insulating a busbar carrying a load current from a high-voltage switch cabinet, comprising: a fixed plate connected to the high-voltage switch cabinet,

2. The high voltage bushing as claimed in claim 1, wherein said high voltage bushing is insert mounted to a side plate of said high voltage switchgear.

3. The high voltage bushing of claim 2, wherein the securing plate is vertically attached to the side plate, and the shed is attached to the wall surface on both sides of the securing plate.

4. The high voltage bushing as claimed in claim 2, wherein said shed comprises at least two of said stacked arrangement, and said shed extends in a direction perpendicular to said anchor plate.

5. The high voltage bushing as claimed in claim 4, wherein said shed comprises a first shed on an inner side and a second shed on an outer side, which are spaced apart from each other, and an extended end of the second shed extends beyond an extended end of the first shed for completely shielding the first shed.

6. The high voltage bushing of claim 5, wherein the surfaces of the first and second sheds are smooth.

7. The high voltage bushing as claimed in claim 5, wherein the extended end of the second shed limits the busbar so that the shortest discharge distance between the busbar and the side plate is greater than 140 mm.

8. The high voltage bushing as claimed in any one of claims 1-7, wherein the anchor plate and the shed are integrally formed of epoxy.

9. The high voltage bushing as claimed in claim 2, wherein at least two of said high voltage bushings are arranged vertically on said side plate, adjacent high voltage bushings being arranged in close proximity.

10. A high voltage switchgear provided with a high voltage bushing according to any of claims 1-9, wherein said busbar extends vertically out of the high voltage switchgear through said high voltage bushing.