CN211670434U

CN211670434U - Switch cabinet busbar sleeve structure and switch cabinet

Info

Publication number: CN211670434U
Application number: CN202020124788.8U
Authority: CN
Inventors: 阮江军
Original assignee: Wuhan University WHU
Current assignee: Wuhan University WHU
Priority date: 2020-01-19
Filing date: 2020-01-19
Publication date: 2020-10-13
Anticipated expiration: 2030-01-19

Abstract

A bus bar fixing piece is gradually expanded from one opening end to the other opening end, and an included angle is formed between a bus bar and the inner wall of the bus bar when the bus bar penetrates through the bus bar fixing piece, so that the electric field intensity along the surface of the bus bar fixing piece is greatly reduced, and the generation of electric arcs can be effectively inhibited even if a water film exists on the insulating surface of a sleeve, so that the common problem that the sleeve of a switch cabinet is easily damaged due to insulation is solved; meanwhile, pollution flashover voltage and wet flashover voltage of the sleeve are obviously improved, the dehumidification requirement on the environment is reduced, the operation cost of the switch cabinet is favorably reduced, and the operation reliability of the switch cabinet is improved.

Description

Switch cabinet busbar sleeve structure and switch cabinet

Technical Field

The application belongs to the power equipment field, especially relates to a female sleeve pipe structure and cubical switchboard of arranging of cubical switchboard.

Background

The high-voltage switch cabinet plays important roles of on-off, control or protection and the like in power generation, power transmission, power distribution, electric energy conversion and distribution of a 3.6-550 kV power system. Under the general condition, high tension switchgear's operational environment is relatively poor, receives steam, dust etc. to influence easily to easily form the electrically conductive water film of one deck at female sheathed tube insulating surface of arranging, this electrically conductive water film makes insulating surface resistance reduce, and leakage current increases, causes insulating surface partial discharge easily and generates heat, leads to sleeve pipe insulating properties to descend, causes the safety in production accident. In addition, the insulating surface of a bushing of ordinary performance is often cracked, and the main cause of the cracking is local arcing of the insulating surface. Therefore, how to suppress the occurrence of the arc on the insulating surface of the bushing in an environment where moisture and dust exist is a key to solve the problem of the bushing insulation.

Disclosure of Invention

An object of the application is to provide a female sleeve pipe structure of arranging of cubical switchboard and cubical switchboard, it is poor to aim at solving traditional female sleeve pipe insulating surface insulating properties of arranging, produces electric arc easily and the problem that generates heat.

The first aspect of the embodiment of the application provides a female sleeve pipe structure of arranging of cubical switchboard, including the insulation support body, still including locating this internal and hollow female mounting that arranges of insulation support, female row's mounting is in the center pin direction interval of insulation support body is equipped with first open end and second open end, just female row's mounting certainly first open end to the second open end gradually expands, first open end forms female arranging via hole, the second open end with insulation support body inner wall ring joint.

In some embodiments, an included angle a between the inner wall of the busbar fixing member and a parallel line of the central axis of the busbar through hole is in a range of: a is more than 0 and less than 90 degrees; the outer wall of the busbar fixing piece and the included angle b of the parallel lines of the central axis of the busbar through hole are in the following range: b is more than 0 and less than 90 degrees.

In some embodiments, the busbar fixing piece is an irregular polyhedron, a frustum of a pyramid or a truncated cone.

In some embodiments, the inner wall trace of the bus bar fixing piece axial section is a straight line or a curve; the trace of the outer wall of the axial section of the busbar fixing piece is a straight line or a curve.

In some embodiments, the outer wall and/or the inner wall of the busbar fixing piece is/are covered with a hydrophobic coating layer.

In some embodiments, the busbar via hole is rectangular, rounded rectangular, oval, circular or elliptical; the end face of the insulating sleeve body is in a shape of a round corner rectangle, a waist circle, a circle, an ellipse or a rectangle.

In some embodiments, the inner wall of the insulating sleeve body is provided with water baffles positioned on two sides of the busbar fixing member in the central axis direction of the insulating sleeve body.

In some embodiments, the outer wall of the insulating sleeve body is provided with a plurality of axially aligned creepage increasing skirts for increasing creepage distance.

In some embodiments, the insulation sleeve body and the busbar fixing piece are integrally injection-molded.

A second aspect of the embodiments of the present application provides a switch cabinet, wherein the switch cabinet is provided with the above-mentioned switch cabinet busbar casing structure.

Compared with the prior art, the embodiment of the application has the advantages that: compared with the traditional switch cabinet busbar sleeve structure, the busbar fixing piece is gradually expanded from one opening end to the other opening end, and an included angle is formed between the busbar and the inner wall of the busbar when the busbar penetrates through the busbar fixing piece, so that the electric field intensity along the surface of the busbar fixing piece is greatly reduced, and the generation of electric arcs can be effectively inhibited even under the condition that a water film exists on the insulating surface of the sleeve, so that the ubiquitous problem that the switch cabinet sleeve is easily damaged due to insulation is solved; meanwhile, pollution flashover voltage and wet flashover voltage of the sleeve are obviously improved, the dehumidification requirement on the environment is reduced, the operation cost of the switch cabinet is favorably reduced, and the operation reliability of the switch cabinet is improved.

Drawings

Fig. 1 is a schematic side view of a switchgear busbar casing structure according to an embodiment of the present disclosure;

FIG. 2 is a sectional view taken along line A-A' of FIG. 1;

FIG. 3 is a sectional view taken along line B-B' of FIG. 1;

fig. 4 is a cross-sectional structure diagram of a busbar fixing member in a busbar bushing structure of a switch cabinet according to an embodiment of the present disclosure;

fig. 5 is a cross-sectional structure view of a busbar fixing member in a busbar bushing structure of a switch cabinet according to another embodiment of the present disclosure;

fig. 6 is a schematic side view of a switchgear busbar casing structure according to another embodiment of the present disclosure;

fig. 7 is a schematic side view of a busbar casing structure of a switchgear according to still another embodiment of the present disclosure;

fig. 8 is a cross-sectional structural diagram of a busbar bushing structure of a switch cabinet according to another embodiment of the present disclosure;

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1, 2 and 3, a busbar casing structure applied to a switch cabinet according to an embodiment of the present disclosure includes an insulating casing body 100 and a hollow busbar fixing member 200 disposed in the insulating casing body 100, the busbar fixing member 200 is provided with a first opening end and a second opening end at an interval in a central axis direction of the insulating casing body 100, the busbar fixing member 200 is gradually expanded from the first opening end to the second opening end, the first opening end forms a busbar through hole 201, and the second opening end is annularly connected to an inner wall of the insulating casing body 100. It is understood that the busbar through hole 201 is used for passing and fixing the busbar 10, and the central axis direction of the insulating sleeve body 100 is the length direction of the sleeve/busbar 10.

In some embodiments, after the bushing of the busbar 10 of the switch cabinet is installed on the switch cabinet, generally, the first open end of the busbar fixing member 200 is the incoming end of the busbar 10 and is located at the outer side of the switch cabinet, the second open end is the outgoing end of the busbar 10 and is located at the inner side of the switch cabinet, the busbar fixing member 200 is hollow, and the width d of the cavity in the direction perpendicular to the central axis of the insulating bushing body 100 is gradually increased along the incoming direction of the busbar 10, so that the inner and outer walls of the busbar fixing member 200 are gradually away from the busbar 10 along the incoming direction of the busbar 10. In other embodiments, the second open end of the busbar fixing element 200 is the incoming end of the busbar 10, and the first open end is the outgoing end of the busbar 10, so that the width d of the cavity of the busbar fixing element 200 gradually decreases along the incoming direction of the busbar 10, and the inner and outer walls of the busbar fixing element 200 gradually approach the busbar 10 along the incoming direction of the busbar 10.

In some embodiments, referring to fig. 4 and 5, an included angle a between the inner wall 202 of the busbar fixing member 200 and the parallel line 11 of the central axis of the busbar through hole 201 is in a range: 0 < a < 90 deg., typically 30 < a < 60 deg. is selected, and referring to fig. 2 and 3, the included angle a can also be understood as the included angle between the inner wall 202 of the busbar fixing member 200 and the edge of the busbar 10 passing through the busbar through hole 201. Similarly, referring to fig. 4 and 5, the range of the included angle b between the outer wall 204 of the busbar fixing member 200 and the parallel line 11 of the center line of the busbar through hole 201 is as follows: 0 < b < 90 deg., typically 30 < b < 60 deg. is selected, and referring to fig. 2 and 3, the angle b can also be understood as the angle between the outer wall 204 of the busbar fixing member 200 and the edge of the busbar 10 passing through the busbar passing hole 201. The electric field intensity of the edge surface of the structure on the inner stress surface (i.e. inner wall) 202 and the outer stress surface (outer wall) 204 is regulated and controlled by stress angles (i.e. included angle a and included angle b), and the structure can be flexibly changed according to the requirements of the sewage and wet environment and the voltage grade.

In some embodiments, referring to fig. 4 and 5, in order to better control the in-plane electric field intensity on the inner stress surface 202 and the outer stress surface 204, the trace of the inner wall 202 of the axial (central axis direction) section of the busbar mount 200 may be arranged in a straight line or a curved line, and the trace of the outer wall 204 of the axial section of the busbar mount 200 may be arranged in a straight line or a curved line, that is, the side walls of the busbar mount 200 may be straight or curved, and the side walls of the busbar mount 200 may have different lengths.

In some embodiments, referring to fig. 6, since the first open end of the busbar fixing element 200 is provided with the busbar through hole 201, the busbar fixing element 200 may be regarded as a hollow irregular polyhedron, a rounded frustum, a truncated pyramid or a truncated cone. In addition, when viewed from the axial cross section of the busbar mount 200, the cross section may be isosceles trapezoid or isosceles trapezoid, or polygon with more than four sides, and the shape may be set according to different requirements, which is not limited herein.

In some embodiments, to accommodate different profiles of the busbar 10, the busbar via hole 201 may be rectangular, rounded rectangular, oval, circular or elliptical. Referring to fig. 6 and 7, in order to adapt to the different shapes of the bushing holes of the switch cabinet, the end surface of the insulating bushing body 100 of the busbar 10 may be a rounded rectangle, a circular oval, or a rectangle, and the shape of the insulating bushing body may be set according to different requirements, which is not limited herein.

In some embodiments, and to improve the flashover resistance along the surface, the outer wall 204 and/or the inner wall 202 of the busbar holder 200 is coated with a hydrophobic coating, such as a flashover resistant coating (PRTV), to form a hydrophobic coating layer (not shown). Further, the inner and outer walls of the insulating sleeve body 100 are also coated with a hydrophobic coating to form a hydrophobic coating layer.

Referring to fig. 8, since the outer wall of the insulating sleeve body 100 is prone to be stained, a plurality of creepage increasing skirts 108 (i.e., umbrella skirts) arranged axially (central axis) and used for increasing creepage distance are disposed on the outer wall of the insulating sleeve body 100, and the creepage increasing skirts 108 are annular protruding structures which are outward along the circumference of the outer wall of the insulating sleeve body 100.

The inner wall of the insulation sleeve body 100 is provided with at least two water baffles 106, in this embodiment, the at least two water baffles 106 are respectively located in the central axis direction of the insulation sleeve body 100, and two sides of the busbar fixing member 200 are close to two axial ends of the insulation sleeve body 100. It can be understood that, after the bushing of the busbar 10 of the switch cabinet is installed, the water baffle 106 should be located at the bottom of the inner wall of the insulating bushing body 100 for collecting the condensed water sliding from the busbar fixing member 200 and preventing the condensed water from dropping to other components of the switch cabinet.

Referring to fig. 1 and 8, in some embodiments, a fixing bracket 102 is disposed on an outer wall of the insulation casing body 10, a mounting hole 104 is further disposed on the fixing bracket 102, and the fixing bracket 102 and the mounting hole 104 are used for being fixedly connected to the cabinet wall 20 of the switch cabinet.

The conical busbar fixing piece 200 enables the electric field intensity of the edge surface of the female busbar pipe of the switch cabinet to be greatly reduced, the sewage and moisture flashing voltage of the sleeve pipe is obviously improved, the dehumidification requirement on the environment is reduced, the operation cost of the switch cabinet is favorably reduced, and the operation reliability of the switch cabinet is improved.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. The utility model provides a female sleeve pipe structure of arranging of cubical switchboard, includes the insulation support body, its characterized in that still including locating this internal and hollow female mounting that arranges of insulation support is in the center pin direction interval of insulation support body is equipped with first open end and second open end, just female mounting of arranging certainly first open end to the second open end gradually expands, first open end forms female arranging via hole, the second open end with insulation support body inner wall ring joint.

2. The switch cabinet busbar sleeve structure according to claim 1, wherein the range of the included angle a between the inner wall of the busbar fixing piece and the parallel line of the central axis of the busbar through hole is as follows: a is more than 0 and less than 90 degrees; the outer wall of the busbar fixing piece and the included angle b of the parallel lines of the central axis of the busbar through hole are in the following range: b is more than 0 and less than 90 degrees.

3. The busbar casing structure of claim 1, wherein the busbar fixing member is irregular polyhedron, prismoid type or truncated cone type.

4. The switch cabinet busbar sleeve structure according to claim 1, wherein the inner wall trace of the axial section of the busbar fixing piece is a straight line or a curve; the trace of the outer wall of the axial section of the busbar fixing piece is a straight line or a curve.

5. The busbar casing structure of claim 1, wherein the outer wall and/or the inner wall of the busbar fixing member is/are covered with a hydrophobic coating layer.

6. The busbar bushing structure according to claim 1, wherein the busbar via hole is rectangular, rounded rectangular, oval, circular or elliptical; the end face of the insulating sleeve body is in a shape of a round corner rectangle, a waist circle, a circle, an ellipse or a rectangle.

7. The busbar sleeve structure of claim 1, wherein the inner wall of the insulating sleeve body is provided with water baffles positioned at two sides of the busbar fixing piece in the central axis direction of the insulating sleeve body.

8. The busbar casing structure of claim 1, wherein the outer wall of the insulating casing body is provided with a plurality of axially arranged creepage increasing skirts for increasing creepage distance.

9. The busbar sleeve structure of claim 1, wherein the insulating sleeve body and the busbar fixing piece are integrally formed by injection molding.

10. A switch cabinet, characterized in that the switch cabinet is provided with a busbar casing structure according to any one of claims 1 to 9.