Novel ring main unit grounding device

Abstract

The utility model discloses a novel looped netowrk cabinet grounding device, including the isolation elbow, its characterized in that: isolation elbow fixedly connected on the installation shaft, and the installation shaft rotatoryly connected on the fixed frame, and the fixed frame is fixedly connected ground row support, and ground row support is fixedly connected static contact on, and static contact is fixedly connected two arc plate on, isolation elbow is hollow, and isolation elbow one end fixedly connected second optical axis, and one end of two dynamic contact knife is slidably connected on second optical axis, and two dynamic contact knife other end is slidably connected on first optical axis, and first optical axis both ends are fixedly connected one shield respectively, the utility model's beneficial effect reflects: set up arc plate, preferential attraction arc, reduce the high temperature ablation of arc when switching on and off, improve the stability of electric contact, and shield provides a smooth, even surface, makes electric field can be evenly distributed, greatly reduced the electric field intensity of key point, thereby effectively avoided partial discharge.

Description

Technical Field

[0001] This utility model relates to the field of ring main unit grounding technology, specifically to a novel ring main unit grounding device. Background Technology

[0002] To improve power supply reliability, power grids are typically connected in a ring, a power supply method known as ring network power supply. A ring main unit (RMU) consists of a switchgear for each distribution branch, with the busbar of this switchgear also forming part of the ring main line. As a type of electrical equipment, the RMU functions as a load switch and fuse, and its use in my country's power grid is becoming increasingly widespread and important. However, existing RMU grounding structures suffer from several problems. During grounding discharge, the high-voltage side is constantly in a discharge state, causing the main contact area to overheat. The high-temperature arc during opening and closing affects subsequent grounding discharge, posing a safety hazard. Furthermore, frequent replacement of the main contacts also impacts power supply reliability. Utility Model Content

[0003] In view of the deficiencies in the prior art, this utility model provides a solution to the existing problems.

[0004] This utility model is achieved through the following technical solution: A novel ring main unit grounding device, comprising an isolation crank arm, characterized in that: the isolation crank arm is fixedly connected to a mounting shaft, the mounting shaft is rotatably connected to a fixed frame, a ground busbar support is fixedly connected to the fixed frame, a ground busbar is fixedly connected to the ground busbar support, a stationary contact is fixedly connected to the ground busbar, and two arc-leading plates are fixedly connected to the stationary contact; the isolation crank arm is hollow, one end of the isolation crank arm is fixedly connected to a second optical axis, one end of two moving contact blades is slidably connected to the second optical axis; the other end of the two moving contact blades is slidably connected to a first optical axis, and a shielding cover is fixedly connected to each end of the first optical axis.

[0005] Preferably, an insulating gasket is fixedly connected to the bottom of the grounding bracket, and an insulating gasket is fixedly connected to the mounting plate. An insulating gasket is sandwiched between the grounding bracket and the stationary contact.

[0006] Preferably, a rivet contact is fixedly connected to the moving contact blade.

[0007] Preferably, a compression spring is connected between the outer side of one end of each of the two moving contact blades and the isolation crank arm, a second optical axis passes through the compression spring, and a copper sleeve is slidably connected on the second optical axis, with the copper sleeve located between the two contact blades; a compression spring is connected between the outer side of the other end of each of the two moving contact blades and the shielding cover, a first optical axis passes through the compression spring, and a copper sleeve is slidably connected on the first optical axis, with the copper sleeve located between the two contact blades.

[0008] Preferably, a support frame is fixedly connected inside the isolation crank arm, and the support frame is located between the two moving blades.

[0009] The beneficial effects of this utility model are reflected in the following aspects: the arc-inducing plate is set to attract the electric arc first, reduce the high-temperature erosion of the electric arc during opening and closing, and improve the stability of the electric contacts; the shielding cover provides a smooth and uniform surface, which enables the electric field to be evenly distributed, greatly reducing the electric field intensity at key points, thereby effectively avoiding partial discharge; the elasticity of the compression spring provides a "buffering" and "compensation" mechanism. As wear increases, the spring will further stretch to continue to maintain a certain contact pressure, ensuring the stability of the equipment's performance throughout its life cycle. Attached Figure Description

[0010] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0011] Figure 1 This is a schematic diagram of the gate opening structure of this utility model; Figure 2 This is a schematic diagram of the grounding structure of this utility model; Figure 3 This is a schematic diagram of the overall structure of this utility model; Figure 4 This utility model Figure 3 Enlarged view of the structure at point A in the middle; Figure 5 This is a schematic diagram of the moving contact blade structure of this utility model; Figure 6 This is a top view of the structure of this utility model; Figure 7 This utility model Figure 6 Cross-sectional view at point BB; Figure 8 This is a schematic diagram of the isolation grounding contact structure of this utility model; In the attached diagram, 1. Moving contact blade, 2. Isolation crank arm, 3. Mounting shaft, 4. Fixing frame, 5. Arc-inducing plate, 6. Stationary contact, 7. Grounding bracket, 8. Shielding cover, 9. Compression spring, 10. Rivet contact, 11. First optical axis, 12. Second optical axis, 13. Copper sleeve, 14. Support frame, 15. Insulating gasket, 16. Mounting plate, 17. Grounding. Detailed Implementation

[0012] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0013] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0014] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” may be used herein to describe the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations.

[0015] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0016] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific implementation of this utility model will be described in detail below with reference to specific embodiments: such as Figures 1-8 The present invention is achieved through the following technical solution: a novel ring main unit grounding device, including an isolation crank arm 2, the isolation crank arm 2 being fixedly connected to the mounting shaft 3. In this embodiment, three isolation crank arms 3 are provided. The mounting shaft 3 is rotatably connected to the fixing frame 4. The grounding bracket 7 is fixedly connected to the fixing frame 4. The isolation crank arm 2 can be opened and closed with the grounding end by rotating the mounting shaft 3. like Figure 8As shown, in this embodiment, a ground busbar 17 is fixedly connected to the ground busbar bracket 7, a stationary contact 6 is fixedly connected to the ground busbar 17, two arc-inducing plates 5 are fixedly connected to the stationary contact 6, a mounting plate 16 is fixedly connected to the bottom of the ground busbar bracket 7, and an insulating gasket 15 is fixedly connected to the mounting plate 16. The high-voltage side is always in a discharge state. In order to avoid the moving contact blade 1 from contacting and burning the stationary contact 6, and to make the discharge complete outside the grounding seat, an arc-inducing plate 5 is set to attract the arc first. The insulating gasket 15 isolates the grounding stationary contact 6 from the ground busbar bracket 7, ensuring that the current flows directly into the ground through the stationary contact 6.

[0017] like Figure 4 and Figure 5 As shown, in this embodiment, the moving contact blade 1 has a groove cut in the middle, turning it into two parallel, elastic blades. A rivet contact 10 is fixedly connected to the moving contact blade 1. The isolation arm 2 is hollow, with one end fixedly connected to a second optical axis 12. One end of the two moving contact blades 1 is slidably connected to the second optical axis 12, which passes through a compression spring 9. A copper sleeve 13 is slidably connected to the second optical axis 12, positioned between the two contact blades 1. The other ends of the two moving contact blades 1 are slidably connected to a first optical axis 11. A shield 8 is fixedly connected to each end of the first optical axis 11. The outer sides of the other ends of the two moving contact blades 1 are connected to… Each of the shielding covers 8 is connected to a compression spring 9. The first optical axis 11 passes through the compression spring 9. A copper sleeve 13 is slidably connected on the first optical axis 11 and is located between the two contact blades 1. When the moving contact blade 1 contacts the grounding stationary contact 6, the two blades are squeezed outward by the grounding stationary contact 6, producing a small elastic deformation. This elastic deformation will act like a spring, generating a continuous inward reaction force. This force acts on the inner wall of the stationary contact 6, forming a stable and reliable contact pressure. This design ensures that even if there are some manufacturing and assembly tolerances, the moving contact blade 1 and the stationary contact 6 can always maintain a good fit. Under high voltage conditions, the charge becomes highly concentrated at the sharp corners and edges of the moving contact 1 component, leading to a sharp increase in electric field strength ("electric field distortion"). If the electric field strength exceeds the breakdown threshold of the surrounding air or insulating medium, corona discharge or more severe partial discharge will occur, such as... Figure 4 As shown, the shield 8 in this embodiment is a smooth metal cover that wraps the sharp part of the moving contact blade 1 assembly. According to the principle of electromagnetic field, the charge will concentrate on the outer surface of the conductor. The shield 8 provides a smooth and uniform surface, which allows the electric field to be evenly distributed, greatly reducing the electric field strength at key points and thus effectively avoiding partial discharge. The elastic force of the compression spring 9 is transmitted to the contact surface with the grounding stationary contact 6 through the blade of the moving contact 1, increasing the additional contact pressure and thus ensuring good electrical contact. In addition, after long-term operation, the contact surface will wear due to arc erosion and mechanical friction. The elasticity of the compression spring 9 provides a "buffering" and "compensation" mechanism. As wear increases, the spring will further stretch to maintain a certain contact pressure, ensuring the stability of the equipment's performance throughout its life cycle, while also better adapting to dimensional tolerances in manufacturing and assembly. During opening and closing operations, the moving contact 1 will be subjected to impact and stress. The connection point between the two moving contact 1s is a weak point in the structure. Therefore, a copper sleeve 13 is used to increase its mechanical strength and stability, prevent the connection point from loosening or deforming under frequent operation, improve the rigidity of the contact assembly, and ensure accurate and reliable opening and closing operations.

[0018] like Figure 7 As shown, in this embodiment, the isolation arm 2 is internally fixedly connected to a support frame 14, which is located between the two moving contact blades 1.

[0019] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A novel ring main unit grounding device, comprising an isolation crank arm (2), characterized in that: The isolation arm (2) is fixedly connected to the mounting shaft (3), the mounting shaft (3) is rotatably connected to the fixed frame (4), the fixed frame (4) is fixedly connected to the ground support (7), the ground support (7) is fixedly connected to the ground (17), the ground (17) is fixedly connected to the stationary contact (6), and the stationary contact (6) is fixedly connected to two arc-leading plates (5); the isolation arm (2) is hollow, one end of the isolation arm (2) is fixedly connected to the second optical axis (12), and one end of the two moving contact blades (1) is slidably connected to the second optical axis (12); the other end of the two moving contact blades (1) is slidably connected to the first optical axis (11), and a shield (8) is fixedly connected to each end of the first optical axis (11).

2. The novel ring main unit grounding device according to claim 1, characterized in that: The bottom of the ground support bracket (7) is fixedly connected to the mounting plate (16), and an insulating pad (15) is fixedly connected to the mounting plate (16).

3. The novel ring main unit grounding device according to claim 1, characterized in that: The moving contact (1) is fixedly connected to the rivet contact (10).

4. The novel ring main unit grounding device according to claim 1, characterized in that: A compression spring (9) is connected between the outer side of one end of each of the two moving blades (1) and the isolation arm (2). The second optical axis (12) passes through the compression spring (9). A copper sleeve (13) is slidably connected on the second optical axis (12). The copper sleeve (13) is located between the two blades (1). A compression spring (9) is connected between the outer side of the other end of each of the two moving blades (1) and the shield (8). The first optical axis (11) passes through the compression spring (9). A copper sleeve (13) is slidably connected on the first optical axis (11). The copper sleeve (13) is located between the two blades (1).

5. A novel ring main unit grounding device according to claim 1, characterized in that: The isolation crank arm (2) is internally fixedly connected to a support frame (14), which is located between the two moving blades (1).

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