Supporting insulator for clean air insulation circuit breaker

Abstract

The invention provides a supporting insulator for a clean air insulation circuit breaker, and the insulator comprises an insulator main body which is of a conical cylindrical structure, the outer wall surface of the insulator main body is a corrugated smooth curved surface, and the inner wall surface of the insulator main body is an arc surface; the number of the shielding rings is two, the two shielding rings are arranged at the upper end and the lower end of the insulator respectively, the shielding ring located at the upper end is connected with an upper plate of the circuit breaker, and the shielding ring located at the lower end is connected with a supporting conductor of the circuit breaker. According to the supporting insulator for the clean air insulation circuit breaker, the problems that an existing movable side insulation support is low in mechanical strength, poor in insulation performance, poor in cooperation with other parts and the like are solved, and the performance and reliability of the circuit breaker are improved.

Description

Technical Field

[0001] The present application belongs to the technical field of high-voltage switches, and in particular relates to a support insulator for a clean air insulated circuit breaker. Background Art

[0002] A gas-insulated metal-enclosed switchgear (GIS) is a type of switchgear that encloses high-voltage electrical equipment in a metal casing and is filled with insulating gas to provide insulation. With the ever-increasing demand for electricity and the rapid development of power grid construction, GIS has gained widespread application in power systems. With its small footprint, high reliability, and easy maintenance, GIS has become a key device in important locations such as urban power grids and substations. As a core component of a GIS, the circuit breaker performs the crucial task of opening and closing circuits. The performance of its insulation and supporting structure directly impacts the reliability and safety of the entire device.

[0003] Clean air insulated vacuum interrupter circuit breakers are currently rarely used in the high-voltage switch field. The dynamic side insulation support generally adopts a metal conductor bonded to a vacuum-impregnated epoxy glass cloth tube structure. However, the processing technology of this structure is complicated, and due to the problem of the electric field, the metal conductor will be larger in volume, which will lead to a larger overall space volume of the circuit breaker, an increase in the shell diameter, and thus a heavier weight, which increases the product cost. Summary of the Invention

[0004] In view of this, the present application aims to propose a support insulator for a clean air insulated circuit breaker to solve the problems of low mechanical strength, poor insulation performance, and poor coordination with other components in the existing dynamic side insulation support.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: The present application provides a support insulator for a clean air insulated circuit breaker, comprising: An insulator body, wherein the insulator body is a tapered cylindrical structure, and the outer wall surface of the insulator body is a corrugated smooth curved surface, and the inner wall surface is a circular arc surface; Shielding ring, shielding ring, there are two shielding rings, and the two shielding rings are respectively arranged at the upper and lower ends of the insulator. The shielding ring at the upper end is connected to the upper plate of the circuit breaker, and the shielding ring at the lower end is connected to the supporting conductor of the circuit breaker.

[0006] Furthermore, the insulator body is an epoxy resin casting, the interior of which is hollow, and the insulating pull rod of the circuit breaker is correspondingly installed in the insulator body; A plurality of rectangular vent holes are arranged on the circumference of the insulator body.

[0007] Furthermore, the upper and lower ends of the insulator body are respectively provided with built-in grooves, and the shielding ring is correspondingly installed in the built-in grooves.

[0008] Furthermore, the diameter of the shielding ring located at the upper end is greater than the diameter of the shielding ring located at the lower end.

[0009] Furthermore, the shielding ring is a metal ring plate, and a plurality of threaded blind holes are opened on the shielding ring, and fastening bolts pass through the threaded blind holes and are respectively connected to the upper plate and the supporting conductor.

[0010] Furthermore, knurling is provided at the contact position between the shielding ring and the insulator body.

[0011] Compared with the prior art, the support insulator for a clean air insulated circuit breaker described in this application has the following beneficial effects: The support insulator for a clean air insulated circuit breaker described in the present application has a combination of an insulator body and a shielding ring. Compared with the insulation tube of a vacuum-impregnated epoxy glass cloth tube, the support insulator has better mechanical strength and electrical insulation performance, reduces the spatial volume, and reduces the height of the circuit breaker; the internal shielding ring can effectively optimize the electric field, avoid the use of a shielding cover, reduce product costs, and effectively improve the performance and reliability of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings: Figure 1 This is a schematic diagram of the support insulator structure according to an embodiment of the present application; Figure 2 This is a cross-sectional view of the insulator body according to an embodiment of the present application; Figure 3 This is a schematic diagram of the shielding ring structure described in an embodiment of the present application; Figure 4 This is a schematic diagram of the installation structure of the support insulator, upper plate and support conductor described in an embodiment of the present application.

[0013] Description of reference numerals: 1- insulator body; 11- vent hole; 12- built-in slot; 2- shielding ring; 21- threaded blind hole; 3- upper plate; 4- supporting conductor; 5- insulating pull rod; 6- shell. DETAILED DESCRIPTION

[0014] In order to make the objectives, technical solutions and advantages of this application more clear, this application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0015] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in the embodiments of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0016] See also Figure 1 and Figure 4 As shown, this embodiment provides a support insulator for a clean air insulated circuit breaker, wherein the insulating gas surrounding the support insulator is clean air (the clean air is a mixture of 80% oxygen and 20% nitrogen), including: The insulator body 1 has a conical cylindrical structure, and the outer wall surface of the insulator body 1 is a corrugated smooth curved surface, and the inner wall surface is a circular arc surface; Shielding ring 2, shielding ring 2, the number of shielding rings 2 is two, and the two shielding rings 2 are respectively arranged at the upper and lower ends of the insulator. The shielding ring 2 at the upper end is connected to the upper plate 3 of the circuit breaker, and the shielding ring 2 at the lower end is connected to the supporting conductor 4 of the circuit breaker.

[0017] Specifically, in this embodiment, the insulator body 1 adopts a unique structural design, and its appearance is optimized according to the internal electric field distribution and mechanical stress conditions of the circuit breaker. The outer surface of the insulator is designed to be a corrugated smooth curved surface, which increases the creepage distance, and the inner surface is an arc surface with a decreasing inner diameter from top to bottom, which increases the stability of the structure; and the shielding ring 2 can effectively optimize the nearby electric field, reduce the use of shielding covers, reduce assembly steps, increase work efficiency, and reduce production costs.

[0018] The support insulator for a clean air insulated circuit breaker described in this embodiment has a combination of an insulator body 1 and a shielding ring 2. Compared with the insulating tube of a vacuum-impregnated epoxy glass cloth tube, the support insulator has better mechanical strength and electrical insulation performance, reduces the spatial volume, and reduces the height of the circuit breaker. The internal shielding ring 2 can effectively optimize the electric field, avoid the use of a shielding cover, reduce product costs, and effectively improve the performance and reliability of the circuit breaker.

[0019] In some embodiments, as Figure 2 As shown, the insulator body 1 is an epoxy resin casting with a hollow interior. The insulating pull rod of the circuit breaker is correspondingly installed in the insulator body 1. There is no shielding cover between the insulator body 1 and the insulating pull rod 5, which makes the internal space larger. When the insulating pull rod 5 moves up and down during opening and closing, it will not hit the epoxy resin casting, and the fault tolerance rate is higher. A plurality of rectangular ventilation holes 11 are arranged around the upper circumference of the insulator main body 1. The interior of the insulator main body 1 adopts a hollow structure. Four ventilation holes 11 are provided on the insulator main body 1. While reducing the weight, it can also effectively suppress the concentration of the internal electric field, improve the overall insulation performance, accelerate gas exchange, and reduce the temperature rise of the product.

[0020] Specifically, in this embodiment, the insulator body 1 uses a high-performance epoxy resin as its base material. Epoxy resin has excellent electrical insulation properties, with a dielectric constant typically reaching 30-50 kV / mm, and even better performance after special processing. A suitable amount of glass fiber and nanoparticles are added to the insulator body. The addition of glass fiber significantly improves the mechanical strength of the insulator, enabling it to withstand greater mechanical stress. The addition of nanoparticles further optimizes the material's microstructure, improving its resistance to partial discharge and aging. In terms of manufacturing process, the insulator body 1 adopts advanced vacuum casting and curing processes. According to the design size and shape of the insulator, a high-precision mold is made. The mold is made of high-quality steel and undergoes precision processing and surface treatment to ensure the dimensional accuracy and surface finish of the mold. The mold has good sealing and demoulding properties to ensure the molding quality of the insulator.

[0021] In some embodiments, the upper and lower ends of the insulator body 1 are respectively provided with built-in grooves 12, and the shielding rings 2 are correspondingly installed in the built-in grooves 12, and the diameter of the shielding ring 2 at the upper end is larger than the diameter of the shielding ring 2 at the lower end; like Figure 3 As shown, the shielding ring 2 is a metal ring plate, and a plurality of threaded blind holes 21 are opened on the shielding ring 2. The fastening bolts pass through the threaded blind holes 21 and are connected to the upper plate 3 and the supporting conductor 4 respectively.

[0022] Specifically, in this embodiment, the top diameter of the insulator body 1 is larger than its bottom diameter, and the diameter decreases gradually from the top to the bottom. Compared with the insulation tube made of vacuum-impregnated epoxy glass cloth tube, the epoxy resin insulator body 1 has superior mechanical strength and electrical insulation performance, reduces the spatial volume, and reduces the height of the circuit breaker (while the vacuum-impregnated epoxy glass cloth tube insulation tube needs to increase the bonding length with the metal conductor while ensuring the insulation distance, which results in the height of the entire vacuum-impregnated epoxy glass cloth tube insulation tube being increased by 80% compared to the support insulator, which greatly increases the height of the entire circuit breaker, increases production costs, and increases transportation difficulties). The internal metal shielding ring 2 can effectively optimize the electric field, avoid the use of a shielding cover, and reduce product costs. The stable structure with small temperature changes can enable the circuit breaker to operate reliably in areas with more extreme temperatures.

[0023] During installation, since the mounting hole for mounting the upper plate 3 of the supporting insulator is a through hole, a plate thickness of 15 mm can meet the installation requirements while ensuring mechanical strength. After a simple alignment, the insulator body 1 and the upper plate 3 can be directly fastened to the upper plate 3 by bolts, and then the upper plate 3 can be directly installed on the housing 6; and the bottom end of the insulator body 1 is connected to the supporting conductor 4 by bolts.

[0024] Metal shielding rings 2 are provided at the upper and lower ends of the insulator body 1. The outer surface of the metal shielding has been sandblasted, which can effectively remove rust, oxide layer, oil stains and other impurities on the metal surface to ensure a clean surface; it can relieve stress concentration on the surface of the metal shielding ring 2, reduce cracks and fatigue damage; it can increase adhesion and enhance the bonding strength between the metal shielding ring 2 and the epoxy resin; and improve the hardness of the surface of the metal shielding ring 2 through the cold work hardening effect.

[0025] In some embodiments, in order to increase the bonding force, knurling is provided at the contact position between the shielding ring 2 and the insulator body 1 .

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

[0027] The embodiments of the present application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of this application.

Claims

1. A support insulator for a clean air insulated circuit breaker, characterized in that: include: An insulator body (1), the insulator body (1) being a tapered cylindrical structure, the outer wall surface of the insulator body (1) being a corrugated smooth curved surface, and the inner wall surface being a circular arc surface; Shielding ring (2), shielding ring (2), the number of the shielding rings (2) is two, the two shielding rings (2) are respectively arranged at the upper and lower ends of the insulator, the shielding ring (2) located at the upper end is connected to the upper plate (3) of the circuit breaker, and the shielding ring (2) located at the lower end is connected to the supporting conductor (4) of the circuit breaker.

2. The support insulator for a clean air insulated circuit breaker according to claim 1, characterized in that: The insulator body (1) is an epoxy resin casting, the interior of which is hollow, and the insulating pull rod (5) of the circuit breaker is correspondingly installed in the insulator body (1); A plurality of rectangular vent holes (11) are arranged around the circumference of the insulator body (1).

3. The support insulator for a clean air insulated circuit breaker according to claim 1, characterized in that: Built-in grooves (12) are respectively provided at the upper and lower ends of the insulator body (1), and the shielding ring (2) is correspondingly installed in the built-in grooves (12).

4. The support insulator for a clean air insulated circuit breaker according to claim 1, characterized in that: The diameter of the shielding ring (2) located at the upper end is greater than the diameter of the shielding ring (2) located at the lower end.

5. The support insulator for a clean air insulated circuit breaker according to claim 1, characterized in that: The shielding ring (2) is a metal ring plate, and a plurality of threaded blind holes (21) are provided on the shielding ring (2). Fastening bolts pass through the threaded blind holes (21) and are respectively connected to the upper plate (3) and the supporting conductor (4).

6. The support insulator for a clean air insulated circuit breaker according to claim 1, characterized in that: The contact position between the shielding ring (2) and the insulator body (1) is provided with knurling.

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