Medium voltage ring net cabinet static contact shielding cover

Abstract

The utility model relates to a kind of medium voltage ring main unit static contact shielding cover, including two symmetrically arranged in the static contact two sides cover body and a for connecting static contact and two cover body's fixed plate, cover body includes trapezoidal flat plate part, annular side plate part, annular transition part, waist-shaped protrusion and reinforcing rib, annular transition part surrounds in trapezoidal flat plate part four around, annular side plate part is located annular transition part inboard, the two sides of annular transition part respectively through rounded corner connection trapezoidal flat plate part and annular side plate part, waist-shaped protrusion and reinforcing rib are arranged in annular side plate part inboard, fixed plate is U-shaped structure, fixed plate is set between two cover body, the two sides of fixed plate respectively through screw and the waist-shaped protrusion of two cover body's detachable connection, the middle part of fixed plate is opened for connecting static contact's mounting hole;The utility model is simple in structure, easy to install, can effectively improve the electric field in disconnecting switch, improve the overall performance and reliability of medium voltage ring main unit disconnecting switch.

Description

Technical Field

[0001] This utility model relates to the field of medium-voltage ring main unit technology, and in particular to a static contact shielding cover for a medium-voltage ring main unit. Background Technology

[0002] A medium-voltage ring main unit (RNB) is a switchgear used in medium-voltage power distribution systems. It is typically installed between substations and end consumers to ensure continuous power supply and isolate faulty sections from the network. The main purpose of a RNB is to provide uninterrupted power to consumers even in the event of a fault, thereby improving the reliability of power supply.

[0003] Currently, the stationary contacts of disconnecting switches in medium-voltage ring main units exhibit several problems during operation: Firstly, electric arcs are generated during opening and closing operations. The high temperature produced by these arcs causes metal evaporation and splashing on the contact surface. These metal vapors and particles may adhere to insulating components, reducing insulation performance and even causing insulation breakdown faults. Secondly, the release of arc energy may also cause burn-out of the stationary contacts themselves, affecting their conductivity and mechanical lifespan. Furthermore, some existing disconnecting switch stationary contact structures are relatively complex, making installation and maintenance inconvenient, and limiting their miniaturization capabilities, thus failing to meet the space-constrained requirements of modern power equipment.

[0004] Therefore, this utility model proposes a shielding cover for the static contact of a medium-voltage ring main unit to solve the above problems. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a shielding cover for the stationary contacts of a medium-voltage ring main unit that can effectively protect the stationary contacts and simplify installation, thereby improving the overall performance and reliability of the disconnecting switch of the medium-voltage ring main unit.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a shielding cover for the static contact of a medium-voltage ring main unit, the innovation of which lies in: including

[0007] Two symmetrically arranged covers on both sides of the stationary contact include a trapezoidal flat plate, an annular side plate, an annular transition, a waist-shaped protrusion, and a reinforcing rib. The annular transition surrounds the trapezoidal flat plate, and the annular side plate is located inside the annular transition. The two sides of the annular transition are connected to the trapezoidal flat plate and the annular side plate by rounded corners, respectively. The waist-shaped protrusion and the reinforcing rib are arranged inside the annular side plate. The reinforcing rib is connected to the trapezoidal flat plate, and the waist-shaped protrusion is connected to the reinforcing rib and also to the trapezoidal flat plate.

[0008] A fixing plate for connecting a stationary contact and two covers. The fixing plate has a U-shaped structure and is positioned between the two covers. The two sides of the fixing plate are detachably connected to the waist-shaped protrusions of the two covers by screws. The middle of the fixing plate has a mounting hole for connecting the stationary contact.

[0009] Furthermore, the cover is integrally formed.

[0010] Furthermore, the annular side plate portion and the annular transition portion of the cover are formed by turning the edge of the trapezoidal flat plate portion inward.

[0011] Furthermore, the cover is made of die-cast aluminum.

[0012] Furthermore, the thickness of the trapezoidal flat plate is 2mm.

[0013] Furthermore, the height of the waist-shaped protrusion is 7~10mm, and the height of the reinforcing rib is 3~5mm.

[0014] Furthermore, the thickness of the fixing plate is 2mm.

[0015] Furthermore, when the two covers are connected to both sides of the fixed plate, the distance between the trapezoidal flat sections of the two covers is greater than 90mm.

[0016] The advantages of this utility model are:

[0017] The shielding cover of this utility model consists of two covers and a fixing plate. It has a simple structure. The fixing plate is connected to the covers and the stationary contact with screws, making installation easy. After the shielding cover is installed in place, the stationary contact and the moving blade of the disconnecting switch are covered in the space of the shielding cover, which can effectively improve the electric field in the disconnecting switch and improve the overall performance and reliability of the disconnecting switch in the medium voltage ring main unit.

[0018] The cover of this invention is integrally molded, which enhances mechanical properties and provides excellent resistance to arc impact deformation. On the other hand, it can effectively avoid electromagnetic leakage caused by split seams and improve the attenuation efficiency of high-frequency interference.

[0019] The annular side plate and annular transition portion of the cover body of this utility model are formed by turning the edge of the trapezoidal flat plate inward, which is simple to process, lightweight and has high structural strength.

[0020] The cover of this utility model is made of die-cast aluminum, which is lightweight, has strong heat dissipation capacity, and can attenuate most of the electromagnetic interference. With the reinforcing rib design, it has a strong resistance to arc impact deformation.

[0021] This invention optimizes the dimensions of the trapezoidal flat plate, the waist-shaped protrusion, the reinforcing ribs, and the fixing plate, thereby improving the shielding cover's adsorption efficiency for arc metal vapor, enhancing the shielding effect, and increasing the rigidity of the shielding cover to prevent deformation during assembly or under external force.

[0022] The distance between the trapezoidal flat plates of the two covers of this invention is greater than 90mm. By increasing the spacing, the uniformity of the electric field distribution can be effectively improved, the phenomenon of local electric field concentration can be reduced, and the risk of insulation breakdown can be reduced. Attached Figure Description

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] Figure 1 This is a schematic diagram showing the connection between the shielding cover and the stationary contact of this utility model.

[0025] Figure 2 This is a schematic diagram of the structure of the shielding cover of this utility model. Detailed Implementation

[0026] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0027] Example

[0028] This embodiment provides a shielding cover for the static contacts of a medium-voltage ring main unit, such as... Figure 1-2 As shown, it includes two covers 1 symmetrically arranged on both sides of the stationary contact 3 and a fixing plate 2 for connecting the stationary contact 3 and the two covers 1.

[0029] The cover 1 includes a trapezoidal flat plate portion 11, an annular side plate portion 12, an annular transition portion 13, a waist-shaped protrusion 14, and a reinforcing rib 15. The annular transition portion 13 surrounds the trapezoidal flat plate portion 11, and the annular side plate portion 12 is located inside the annular transition portion 13. The two sides of the annular transition portion 13 are connected to the trapezoidal flat plate portion 11 and the annular side plate portion 12 respectively through rounded corners. The waist-shaped protrusion 14 and the reinforcing rib 15 are disposed inside the annular side plate portion 12. The reinforcing rib 15 is connected to the trapezoidal flat plate portion 11, and the waist-shaped protrusion 14 is connected to the reinforcing rib 15 and also connected to the trapezoidal flat plate portion 11. In this embodiment, the cover 1 is integrally formed. The annular side plate portion 12 and the annular transition portion 13 of the cover 1 are formed by turning the edge of the trapezoidal flat plate portion 11 inward. The processing technology is simple, the weight is light, the structural strength is high, and it has excellent resistance to arc impact deformation. It can also effectively avoid electromagnetic leakage caused by split joints and improve the high-frequency interference attenuation efficiency.

[0030] The fixing plate 2 has a U-shaped structure and is positioned between two covers 1. Both sides of the fixing plate 2 are detachably connected to the waist-shaped protrusions 14 of the two covers 1 via two first screws 5. The fixing plate 2 has two first mounting holes on each side, and each cover 1 has two first threaded holes on its waist-shaped protrusions 14. Each first screw 5 has a first washer fitted onto it. After passing through the corresponding first mounting hole, the first screw 5 is threaded into the corresponding first threaded hole, thus fixing the cover 1 to the fixing plate 2. The fixing plate 2 is detachably connected to the stationary contact 3 via two second screws 4. The middle of the fixing plate 2 has two second mounting holes for connecting the stationary contact 3. The stationary contact 3 has two second threaded holes. Each second screw 4 has a second washer fitted onto it. After passing through the corresponding second mounting hole, the second screw 4 is threaded into the corresponding second threaded hole, thus fixing the fixing plate 2 to the stationary contact 3 and completing the connection between the shield and the stationary contact.

[0031] In this embodiment, both the shield 1 and the fixing plate 2 are made of die-cast aluminum, which is lightweight, has strong heat dissipation capacity, and can attenuate most electromagnetic interference. Combined with the reinforcing rib design, it has superior resistance to arc impact deformation. In this embodiment, the trapezoidal flat plate 11 of the shield 1 is 2mm thick, the waist-shaped protrusion is 8mm high, the reinforcing rib is 4mm high, and the fixing plate is 2mm thick. This size design not only improves the shield's adsorption efficiency of arc metal vapor, enhancing the shielding effect, but also increases the rigidity of the shield, preventing deformation during assembly or under external force.

[0032] In this embodiment, when the two covers are connected to both sides of the fixed plate, the distance between the trapezoidal flat plate portions of the two covers is 100mm. By adopting a large spacing design, the uniformity of the electric field distribution can be effectively improved, the phenomenon of local electric field concentration can be reduced, and the risk of insulation breakdown can be reduced.

[0033] The shielding cover in this embodiment consists of two cover bodies 1 and a fixing plate 2. The structure is simple. The fixing plate 2 is connected to the cover body 1 and the stationary contact 3 by screws, which makes the installation simple. After the shielding cover is installed in place, the stationary contact and the moving blade of the disconnecting switch are covered in the space of the shielding cover, which effectively improves the electric field in the disconnecting switch and improves the overall performance and reliability of the disconnecting switch in the medium voltage ring main unit.

[0034] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A shielding cover for the stationary contacts of a medium-voltage ring main unit, characterized in that: include Two symmetrically arranged covers on both sides of the stationary contact include a trapezoidal flat plate, an annular side plate, an annular transition, a waist-shaped protrusion, and a reinforcing rib. The annular transition surrounds the trapezoidal flat plate, and the annular side plate is located inside the annular transition. The two sides of the annular transition are connected to the trapezoidal flat plate and the annular side plate by rounded corners, respectively. The waist-shaped protrusion and the reinforcing rib are arranged inside the annular side plate. The reinforcing rib is connected to the trapezoidal flat plate, and the waist-shaped protrusion is connected to the reinforcing rib and also to the trapezoidal flat plate. A fixing plate for connecting a stationary contact and two covers. The fixing plate has a U-shaped structure and is positioned between the two covers. The two sides of the fixing plate are detachably connected to the waist-shaped protrusions of the two covers by screws. The middle of the fixing plate has a mounting hole for connecting the stationary contact.

2. The shielding cover for the stationary contact of the medium-voltage ring main unit according to claim 1, characterized in that: The cover is integrally molded.

3. The static contact shielding cover of the medium-voltage ring main unit according to claim 2, characterized in that: The annular side plate portion and the annular transition portion of the cover are formed by turning the edge of the trapezoidal flat plate portion inward.

4. The static contact shielding cover of the medium-voltage ring main unit according to claim 1, characterized in that: The cover is made of die-cast aluminum.

5. The static contact shielding cover of the medium-voltage ring main unit according to claim 1, characterized in that: The thickness of the trapezoidal flat plate is 2mm.

6. The shielding cover for the stationary contact of the medium-voltage ring main unit according to claim 1, characterized in that: The height of the waist-shaped protrusion is 7~10mm, and the height of the reinforcing rib is 3~5mm.

7. The stationary contact shielding cover of the medium-voltage ring main unit according to claim 1, characterized in that: The thickness of the fixing plate is 2mm.

8. The static contact shielding cover of the medium-voltage ring main unit according to claim 1, characterized in that: When the two covers are connected to both sides of the fixed plate, the distance between the trapezoidal flat sections of the two covers is greater than 90mm.

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