Grounding switch and switchgear

Abstract

The application belongs to the technical field of grounding switches, and particularly relates to a grounding switch and a switch cabinet, which comprise a moving side assembly and a static side assembly; the moving side assembly comprises a moving contact and a moving arc contact, and the moving arc contact is fixedly connected with the moving contact; the static side assembly comprises a static contact and a static arc contact, and the static arc contact is fixedly connected with the static contact; the moving side assembly is configured to be rotatable, so that the moving arc contact and the moving contact are respectively in contact with the static arc contact and the static contact during closing, and the contact time point of the moving arc contact and the static arc contact is earlier than the contact time point of the moving contact and the static contact. According to the application, the moving arc contact, the static arc contact, the moving contact and the static contact are used to ensure that the moving arc contact and the static arc contact are in contact earlier than the moving contact and the static contact during closing, so that the moving arc contact and the static arc contact can guide and bear arc ablation generated during short-circuit closing, the problem of closing test failure of the related grounding switch caused by contact ablation is effectively reduced, and the reliability and the service life of the switch equipment are significantly improved.

Description

Technical Field

[0001] This application belongs to the field of grounding switch technology, specifically relating to a grounding switch and switch cabinet. Background Technology

[0002] In medium-voltage power distribution systems, grounding switches are critical safety components of ring main units. Their reliability under extreme conditions such as short-circuit currents must be verified through a "closing test." This means that during a simulated fault, the grounding switch must be able to safely close the short-circuit current without damaging its own structure. However, existing grounding switches suffer from the technical problem of contacts being easily eroded by electric arcs. Utility Model Content

[0003] The purpose of this application is to solve the technical problem that contacts are prone to arc erosion in related technologies.

[0004] A first aspect of this application provides a grounding switch, including a moving side assembly and a stationary side assembly; the moving side assembly includes a moving contact and a moving arc contact, the moving arc contact being fixedly connected to the moving contact; the stationary side assembly includes a stationary contact and a stationary arc contact, the stationary arc contact being fixedly connected to the stationary contact; wherein, the moving side assembly is configured to be rotatable, such that the moving arc contact and the moving contact respectively contact the stationary arc contact and the stationary contact during the closing process, and the contact point between the moving arc contact and the stationary arc contact is earlier than the contact point between the moving contact and the stationary contact.

[0005] In one exemplary embodiment of this application, the moving arc contact includes a wrapping portion and a fixing portion. The wrapping portion at least partially wraps the outer side surface and top and bottom surfaces of the moving contact, and the fixing portion is fixedly connected to the outer side surface of the moving contact by fasteners.

[0006] In one exemplary embodiment of this application, the end of the wrapping portion that wraps around the top and bottom surfaces of the moving contact is provided with a rounded corner structure.

[0007] In one exemplary embodiment of this application, the stationary contact includes two opposing side arms, with a receiving space formed between the two side arms. The stationary contact is at least partially housed in the receiving space and is fixedly connected to the two side arms.

[0008] In one exemplary embodiment of this application, the closing end face of the side arm of the stationary arc contact is located in front of the closing end face of the stationary contact in the closing direction.

[0009] In one exemplary embodiment of this application, the side arm of the stationary contact protrudes towards the side of the stationary contact, and the protrusion is configured to interact with the moving contact when the circuit is closed, so as to limit the relative position between the moving contact and the stationary contact.

[0010] In one exemplary embodiment of this application, the bottom of the side arm of the static arc contact is provided with a slot.

[0011] In one exemplary embodiment of this application, the moving arc contact and the stationary arc contact comprise a metallic material resistant to arc erosion; The moving contact and the stationary contact are made of copper.

[0012] In one exemplary embodiment of this application, the mounting area of ​​the stationary contact and / or the stationary arc contact is provided with a shielding cover surrounding a portion thereof.

[0013] A second aspect of this application provides a switch cabinet, comprising: a cabinet body; and a grounding switch as described in any of the preceding claims, the grounding switch being disposed within the cabinet body.

[0014] The grounding switch and switchgear of this application have at least the following beneficial effects: The grounding switch of this application includes a moving-side assembly and a stationary-side assembly. The moving-side assembly includes a moving contact and a moving arc contact connected to each other, and the stationary-side assembly includes a stationary contact and a stationary arc contact connected to each other. By setting separate moving arc contacts and stationary arc contacts from moving contacts and stationary contacts, it is ensured that the moving arc contacts and stationary arc contacts make contact before the moving contacts and stationary contacts during closing. This successfully separates the dual functions of current carrying and arc initiation undertaken by a single contact in related technologies in a structural manner. This allows the moving arc contacts and stationary arc contacts to guide and withstand the arc erosion generated during short-circuit closing, thereby effectively reducing the damage to the moving and stationary contacts that carry current. This effectively reduces the problem of closing test failures caused by contact erosion in related grounding switches, and significantly improves the reliability and lifespan of the switchgear.

[0015] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0018] Figure 1 A schematic diagram of the structure of the moving-side component and the stationary-side component in the open state provided in some embodiments is shown.

[0019] Figure 2 A schematic diagram of the structure provided in some embodiments, showing the moving arc contact fixed to the moving contact, is shown.

[0020] Figure 3 A schematic diagram of the structure provided in some embodiments, showing the static arc contact fixed to the static contact, is shown.

[0021] Figure 4 A schematic diagram of the structure of the moving side component and the stationary side component in the open state provided in some embodiments is shown.

[0022] Figure 5 A schematic diagram of the structure of the moving side component and the stationary side component in the closed state provided in some embodiments is shown.

[0023] Figure 6 A schematic diagram of the switch cabinet provided in some embodiments is shown.

[0024] Explanation of reference numerals in the attached figures: 100. Grounding switch; 110. Moving side assembly; 111. Moving end rotating shaft; 112. Moving contact; 113. Moving arc contact; 1130. Fixing part; 1131. Encasing part; 114. Transmission plate; 115. Connecting plate; 120. Stationary side assembly; 121. Stationary contact; 122. Stationary arc contact; 1220. Side arm; 1221. Accommodation space; 1222. Protrusion; 1223. Slot; 123. Stationary end copper busbar; 200. Switch cabinet; 210. Cabinet body. Detailed Implementation

[0025] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0026] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying 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 this application, "multiple" means two or more, unless otherwise explicitly specified.

[0027] In this application, unless otherwise expressly specified and limited, the terms "assembly," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0029] like Figure 1 The schematic diagram of the grounding switch 100 shown in this application embodiment illustrates a grounding switch 100 that can adopt a knife-switch type rotating structure. It can be driven by an external operating mechanism to rotate the moving end rotating shaft 111, thereby realizing the closing and opening actions of the grounding switch 100. This grounding switch 100 adopts a double-contact structure, which decomposes the single contact in related technologies into an arc contact specifically responsible for arc initiation and a main contact responsible for current conduction, ensuring that the arc contact contacts before the main contact during closing. The double-contact grounding switch 100 successfully separates the dual functions of current conduction and arc initiation undertaken by a single contact in related technologies, allowing the moving arc contact 113 and the stationary arc contact 122 to guide and withstand the arc erosion generated during short-circuit closing. This effectively reduces damage to the moving contact 112 and the stationary contact 121 responsible for current conduction, significantly reducing the problem of closing test failures caused by contact erosion in grounding switches 100 in related technologies, and significantly improving the reliability and lifespan of the switching equipment.

[0030] Please continue to see Figure 1 As shown, the grounding switch 100 includes a moving-side assembly 110 and a stationary-side assembly 120. The moving-side assembly 110 includes a moving-end rotating shaft 111, a moving contact 112, and a moving arc contact 113; the stationary-side assembly 120 includes a stationary contact 121, a stationary arc contact 122, and a stationary-end copper busbar 123. The components can be connected by fasteners such as screws, making the overall assembly simple and the positioning precise.

[0031] In addition, the grounding switch 100 is applicable to medium-voltage power distribution systems with voltage levels of 10kV-40.5kV, and it can fully meet the various performance requirements of medium-voltage ring main units.

[0032] In some embodiments, the moving-side assembly 110 is primarily responsible for performing closing and opening operations. The moving-end rotating shaft 111, serving as the power input end, can be made of high-strength copper alloy material, and its surface can be silver-plated to improve conductivity and corrosion resistance. The moving-end rotating shaft 111 can be supported on the insulating bracket of the ring main unit by bearings to ensure flexible and reliable rotation. Its shaft end can be provided with a square tenon or spline structure for connecting to the operating mechanism to transmit operating torque.

[0033] In some embodiments, see Figure 1 or Figure 2 As shown, the moving-side assembly 110 also includes a transmission plate 114 to further enhance the stability and synchronization of the structure. The transmission plate 114 is fixedly sleeved on the moving-end rotating shaft 111 and can rotate synchronously with the moving-end rotating shaft 111. The transmission plate 114 can be supported by 6mm thick steel, which has sufficient mechanical strength.

[0034] It should be noted that a key connection can be used between the transmission plate 114 and the moving end rotating shaft 111 to ensure reliable torque transmission.

[0035] In some embodiments, the moving contact 112 may comprise copper, a highly conductive material. Two plate-shaped moving contacts 112 are mounted opposite each other on the transmission plate 114 using fasteners such as screws, and extend radially along the moving end transmission shaft. By fixing the moving contacts 112 to the transmission plate 114, the moving contacts 112 can rotate synchronously with the moving end rotation shaft 111, while also facilitating the disassembly and replacement of individual contacts.

[0036] In some embodiments, each transmission plate 114 may be connected to two moving contacts 112 to form an independent rotation unit.

[0037] Understandably, in applications requiring multiple moving contacts 112, multiple moving contacts 112 are provided on the moving end rotating shaft 111. These moving contacts 112 are arranged at intervals along the axial direction of the moving end rotating shaft 111, and the spacing can be designed according to specific application requirements. Using multiple moving contacts 112 increases the current-carrying area and improves the current-carrying capacity to adapt to high-current applications. Furthermore, this structural design facilitates the inspection and replacement of individual contacts. When a moving contact 112 requires maintenance, it can be replaced individually by simply removing the corresponding connecting plate 115 screws and the moving contact 112 fixing screws, without disassembling the entire moving side assembly 110, greatly simplifying the maintenance process.

[0038] See Figure 2As shown, to ensure synchronized operation of multiple moving contacts 112, in some embodiments, the moving side assembly 110 further includes a connecting plate 115, which connects the various transmission plates 114 together. The connecting plate 115 can be made of the same material as the transmission plates 114, with a thickness of 5mm, and is fixedly connected to each transmission plate 114 by fasteners such as screws. The connection plate 115 ensures that all moving contacts 112 form an integrated rotation system, guaranteeing that the rotation angle and speed of each moving contact 112 are completely consistent during closing and opening processes.

[0039] Understandably, the rigid connection of the connecting plate 115 not only eliminates the potential problem of asynchronous movement between the moving contacts 112, ensuring that all contacts contact and separate simultaneously, but also improves the structural rigidity of the entire moving side assembly 110, enabling it to better withstand the electrodynamic force generated by the short-circuit current. Furthermore, the modular design facilitates manufacturing and assembly, as well as subsequent maintenance and component replacement.

[0040] In some embodiments, see Figure 2 As shown, the moving arc contact 113 may include a fixing part 1130. It can be fixedly connected to the outer surface of the moving contact 112 via the fixing part 1130 and fasteners such as screws. The moving arc contact 113 corresponds one-to-one with the moving contact 112, and the moving arc contact 113 may include a metal material resistant to arc erosion, such as a copper-tungsten alloy or a copper-chromium alloy. This material has excellent arc erosion resistance, and the copper content ensures a certain level of conductivity.

[0041] In some embodiments, see Figure 2 As shown, the moving arc contact 113 may further include a wrapping portion 1131. The wrapping portion 1131 of the moving arc contact 113 may adopt a U-shaped structure, partially wrapping the moving contact 112 from three directions: that is, the wrapping portion 1131 wraps the outer side of the moving contact 112 and the top and bottom surfaces on the side away from the moving end rotation axis 111. This wrapping design not only increases the contact area between the moving arc contact 113 and the moving contact 112, which is beneficial for current conduction and heat dissipation; it can also enhance the mechanical strength of the component, enabling it to better withstand closing impacts and short-circuit electrodynamic forces without deformation; and it can also provide a clear guiding path for the arc, ensuring that the arc is generated and extinguished at a predetermined position.

[0042] It should be noted that, see Figure 2 As shown, a rounded corner structure is also provided at the end of the wrapping part 1131 that wraps the top and bottom surfaces of the moving contact 112. This rounded corner structure can not only smooth the electric field distribution, reduce the electric field concentration during the closing process, and suppress the occurrence of partial discharge, but also reduce the concentration of mechanical stress, avoid cracks or deformation after repeated operations, and extend the service life.

[0043] In some embodiments, the fillet radius can be 1.5 mm, which ensures the electric field optimization effect without affecting the compactness of the structure. The fillet is precision ground to achieve a surface roughness Ra≤0.8μm, ensuring a uniform electric field distribution.

[0044] Assembly process of moving side assembly 110: First, the transmission plate 114 is sleeved on the moving end transmission shaft, and multiple transmission plates 114 are evenly spaced apart from each other; then, the multiple transmission plates 114 are connected into a whole using the connecting plate 115; then, the moving contact 112 is installed on the transmission plate 114 using screws; then, the wrapping part 1131 of the moving arc contact 113 is sleeved on the outside of the moving contact 112, and the moving arc contact 113 and the moving contact 112 are connected and fixed using fixing screws.

[0045] In some embodiments, the stationary side assembly 120 is the fixing part 1130 of the grounding switch 100, providing a contact interface for the moving side assembly 110. The stationary copper busbar 123 serves as the lead-out terminal of the grounding loop, and may include copper. The stationary copper busbar 123 can be reliably connected to the grounding system of the ring main unit via bolts. The surface of the stationary copper busbar 123 is tin-plated to prevent oxidation and ensure good contact performance.

[0046] In some embodiments, see Figure 1 or Figure 3 As shown, the stationary contact 121 can be fixed to the stationary copper busbar 123 by screws. The stationary contact 121 can also be made of copper to ensure excellent conductivity. The contact area of ​​the stationary contact 121 is designed as an arc-shaped curved surface with a radius of curvature that matches that of the moving contact 112 to ensure sufficient contact area and appropriate contact pressure during contact.

[0047] In some embodiments, see Figure 3 As shown, the stationary contact 122 may include two opposing side arms 1220, with a receiving space 1221 formed between the two side arms 1220. The stationary contact 121 is at least partially housed within the receiving space 1221 and is fixedly connected to the two side arms 1220 by screws. The stationary contact 122 may be made of the same arc-erosion-resistant metal material as the moving contact 113, such as copper-tungsten alloy or copper-chromium alloy, to ensure equivalent arc-erosion resistance.

[0048] In some embodiments, the side arm 1220 may have a thickness of 6 mm and a height of 25 mm, providing sufficient mechanical strength and thermal capacity.

[0049] In some embodiments, the closing end face of the side arm 1220 of the stationary arc contact 122 is located in front of the closing end face of the stationary contact 121 in the closing direction, so as to ensure that during the closing process, the moving arc contact 113 contacts the stationary arc contact 122 first, and then the moving contact 112 contacts the stationary contact 121.

[0050] In some embodiments, the front-to-back position difference can be 4 mm to ensure reliable timing control without excessively increasing the structural size.

[0051] In some embodiments, the structural design of the stationary side assembly 120 is specially optimized to achieve reliable arc ignition control and ensure effective protection of the main contacts. For example, in the open state, the minimum distance between the end face of the stationary arc contact 122 facing the moving side assembly 110 and the moving side assembly 110 is less than the minimum distance between the corresponding end face of the stationary contact 121 and the moving side assembly 110.

[0052] The realization of this distance difference relies on the special structural design of the stationary arc contact 122. The two side arms 1220 of the stationary arc contact 122 extend forward, forming a forward-protruding contact portion, while the stationary contact 121 is positioned inside and behind the U-shaped receiving space 1221 formed by the two side arms 1220. This arrangement ensures that, in the open position, the contact portion of the stationary arc contact 122 protrudes forward relative to the stationary contact 121 in the closing direction, thereby spatially guaranteeing the priority contact condition of the arc contact.

[0053] The key function of this structural design is to precisely control the discharge position during the closing process. When the moving side assembly 110 moves towards the stationary side assembly 120, because the stationary arc contact 122 is closer to the moving side assembly 110 than the stationary contact 121, the moving arc contact 113 will first enter the discharge distance range with the stationary arc contact 122. When the electric field strength reaches the air breakdown field strength, the discharge phenomenon will preferentially occur between the moving arc contact 113 and the stationary arc contact 122, thereby confining the process that could generate a destructive arc within the specially designed arc contact system.

[0054] To ensure the reliability of this function, the stationary arc contact 122 forms an effective wrapping structure around the stationary contact 121. Two side arms 1220 extend forward from both sides of the stationary contact 121, providing not only mechanical support but, more importantly, establishing a path for guiding the arc. During closing, this wrapping structure ensures that even with assembly tolerances or component deformation, the discharge is confined between the arc contacts and does not affect the main contact system.

[0055] Another advantage of this design is its improved environmental adaptability. This distance design compensates for potential positional changes caused by differences in the thermal expansion coefficients of materials under varying temperature and humidity conditions.

[0056] Furthermore, this structural design facilitates on-site maintenance and inspection. Maintenance personnel can easily visually inspect the relative positions of the stationary arc contact 122 and the stationary contact 121 to determine if the equipment is in normal working order. If repeated operation causes arc contact erosion that affects distance parameters, timely adjustments or replacements can be made to ensure the long-term reliable operation of the equipment.

[0057] In some embodiments, see Figure 3 As shown, a protrusion 1222 is provided on the side of the side arm 1220 of the stationary arc contact 122 facing the stationary contact 121. This protrusion 1222 serves as a mechanical limiting structure, and its width can be the same as the side arm 1220. When the grounding switch 100 is in the open state or at the initial stage of the closing process, the protrusion 1222 can form a physical barrier or limiting block between the moving contact 112 and the stationary contact 121. This ensures that the moving contact 112 cannot make premature or excessive direct contact with the stationary contact 121, thereby ensuring that the moving arc contact 113 and the stationary arc contact 122 can preferentially establish electrical contact and achieve reliable arc ignition.

[0058] Understandably, the presence of the protrusion 1222 maintains a small gap between the moving contact 112 and the stationary contact 121. This gap design ensures that during the closing process, the moving arc contact 113 has sufficient time and space to make contact or pre-break down before the stationary arc contact 122.

[0059] In addition, the protrusion 1222 can also provide mechanical restraint with the moving contact 112 at the end position of closing, which helps to stabilize the contact pressure of the main current circuit and enhance the resistance of the entire contact system to electric repulsion when subjected to short-circuit current.

[0060] See Figure 3 As shown, a slot 1223 is provided at the bottom of the side arm 1220 of the stationary arc contact 122. The design of this slot 1223 not only promotes airflow during closing and opening operations, which helps to remove arc products and dissipate heat; it also reduces the operating torque and the contact force between the moving arc contact 113 and the stationary arc contact 122, making the closing and opening operations more convenient and flexible; moreover, this slot 1223 also plays a certain role in stress relief, reducing the risk of deformation of the side arm 1220 under thermal stress.

[0061] It should be noted that the width of the slot 1223 can be 2.5mm and the depth can be 8mm. It is made by electrical discharge machining to ensure dimensional accuracy and surface quality.

[0062] In other embodiments, the mounting areas of the stationary contact 121 and the stationary arc contact 122 are provided with shielding covers surrounding a portion thereof. The shielding covers may be made of aluminum with a thickness of 2mm, and the surface may be anodized to improve corrosion resistance. The shielding covers can be connected to the stationary copper busbar 123 with screws to ensure voltage consistency. The design of the shielding covers fully considers the internal space constraints of the ring main unit's gas box, ensuring shielding effectiveness without affecting the current-carrying and closing performance of the contacts. Users can flexibly choose whether to install this component based on actual insulation requirements.

[0063] The shield works on the principle of electrostatic field equalization. In high-voltage equipment, sharp metal edges can cause electric field concentration, leading to partial discharge or even insulation flashover. The shield, with its smooth curved surface, disperses the electric field lines at sharp edges, resulting in a more uniform electric field distribution. Its radius of curvature is no less than 10mm, and its transition fillet radius is no less than 3mm.

[0064] The working principle of this application: The working process of the grounding switch 100 of this application has a clear timing characteristic. When the grounding switch 100 receives a closing command, the external operating mechanism drives the moving end rotating shaft 111 to rotate counterclockwise, which drives the transmission plate 114, moving contact 112, and moving contact head toward the stationary side assembly 120.

[0065] See Figure 4 As shown, in the initial closing stage, the moving arc contact 113 first contacts the stationary arc contact 122. Since the moving contact 112 and stationary contact 121 have not yet made contact, the entire system voltage is applied between the soon-to-be-contacting moving arc contact 113 and stationary arc contact 122. When the gap between the moving arc contact 113 and stationary arc contact 122 decreases to the breakdown distance, a pre-breakdown closing phenomenon occurs, generating an arc. This ensures the arc is controlled between the moving arc contact 113 and stationary arc contact 122.

[0066] See Figure 5 As shown, as the moving-side assembly 110 continues to move, the moving contact 112 begins to contact the stationary contact 121; that is, the contact point between the moving arc contact 113 and the stationary arc contact 122 is earlier than the contact point between the moving contact 112 and the stationary contact 121. At this time, since the main contact circuit has been established, the short-circuit current will mainly flow through the moving contact 112 and the stationary contact 121, and the arc current gradually decreases until it is extinguished. Throughout the entire closing process, the arc is generated and extinguished only between the moving arc contact 113 and the stationary arc contact 122, and the moving contact 112 and the stationary contact 121 are always protected, avoiding direct arc erosion.

[0067] The opening process is the reverse of the closing process. First, the moving contact 112 and the stationary contact 121 are separated from each other. Then, the moving arc contact 113 and the stationary arc contact 122 are separated from each other. This separation sequence ensures that the arc that may be generated during the opening process is extinguished between the moving arc contact 113 and the stationary arc contact 122, protecting the moving contact 112 and the stationary contact 121 from damage.

[0068] During the closing test, when a short-circuit fault occurs in the system, the grounding switch 100 needs to close a huge short-circuit current. At this time, the pre-breakdown arc energy between the moving arc contact 113 and the stationary arc contact 122 is extremely high, with an arc power exceeding 10MW and a temperature reaching 10,000℃~20,000℃. Thanks to the excellent ablation resistance of copper-tungsten alloy and copper-chromium alloy, the moving arc contact 113 and the stationary arc contact 122 can withstand these extreme conditions without serious damage. The ablation mechanism of copper-tungsten alloy mainly involves the heat absorption of copper evaporation and the retention of the tungsten skeleton. This self-cooling mechanism allows the material to maintain its structural integrity under extreme thermal loads.

[0069] By employing a dual-contact functional division structure and precise contact timing control, this application effectively solves the problem of easy contact erosion in grounding switch 100 in related technologies. Specifically, the moving arc contact 113 and the stationary arc contact 122 are dedicated to arc initiation, using arc-resistant metal materials capable of withstanding the high-temperature arc during short-circuit closing. The moving contact 112 and the stationary contact 121 are dedicated to current carrying, using highly conductive copper materials to ensure normal current carrying requirements. This collaborative design enables the grounding switch 100 to possess both excellent arc resistance and current carrying capacity.

[0070] Compared with the single-contact grounding switch 100 in related technologies, the grounding switch 100 of this application maintains good working condition after five tests. This greatly extends the service life of the grounding switch 100 and reduces maintenance requirements.

[0071] Meanwhile, the grounding switch 100 of this application has a compact structure, is easy to assemble, and all components are manufactured using standard processes, making costs controllable and giving it good market competitiveness. Its modular design facilitates maintenance and replacement, reducing the total life cycle cost.

[0072] See Figure 6 As shown in the figure, this application embodiment also provides a switch cabinet 200, which includes a cabinet body 210 and the aforementioned grounding switch 100, with the grounding switch 100 disposed within the cabinet body 210. The switch cabinet 200 can be an air-insulated ring main unit, an SF6 gas-insulated ring main unit, or a solid-insulated ring main unit, suitable for medium-voltage power distribution systems of 10kV-40.5kV.

[0073] In practical applications, the grounding switch 100 of the present invention has a smaller contact erosion area and a longer overall service life compared to the grounding switch 100 with a single contact design in related technologies.

[0074] In the description of this specification, references to terms such as "some embodiments," "exemplarily," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0075] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application. Therefore, any changes or modifications made in accordance with the claims and description of this application should fall within the scope of this patent application.

Claims

1. A grounding switch, characterized in that, Including moving-side components and stationary-side components; The moving side assembly includes a moving contact and a moving arc contact, wherein the moving arc contact is fixedly connected to the moving contact; The stationary side assembly includes a stationary contact and a stationary arc contact, wherein the stationary arc contact is fixedly connected to the stationary contact; The moving side assembly is configured to be rotatable so that the moving arc contact and the moving contact contact respectively contact the stationary arc contact and the stationary contact during the closing process, and the contact point between the moving arc contact and the stationary arc contact is earlier than the contact point between the moving contact and the stationary contact.

2. The grounding switch according to claim 1, characterized in that, The moving contact includes a wrapping part and a fixing part. The wrapping part at least partially wraps the outer side and top and bottom surfaces of the moving contact, and the fixing part is fixedly connected to the outer side of the moving contact by fasteners.

3. The grounding switch according to claim 2, characterized in that, The ends of the wrapping part that wrap around the top and bottom surfaces of the moving contact are provided with rounded corners.

4. The grounding switch according to claim 1, characterized in that, The stationary contact includes two opposing side arms, with a receiving space formed between the two side arms. The stationary contact is at least partially housed in the receiving space and is fixedly connected to the two side arms.

5. The grounding switch according to claim 4, characterized in that, The closing end face of the side arm of the stationary arc contact is located in front of the closing end face of the stationary contact in the closing direction.

6. The grounding switch according to claim 4, characterized in that, The side arm of the stationary contact has a protrusion extending towards the stationary contact. The protrusion is configured to interact with the moving contact during closing to limit the relative position between the moving contact and the stationary contact.

7. The grounding switch according to claim 4, characterized in that, The bottom of the side arm of the static arc contact is provided with a slot.

8. The grounding switch according to claim 1, characterized in that, The moving arc contact and the stationary arc contact are made of metal materials resistant to arc erosion; The moving contact and the stationary contact are made of copper.

9. The grounding switch according to claim 1, characterized in that, The mounting area of ​​the stationary contact and / or the stationary arc contact is provided with a shielding cover that surrounds a portion thereof.

10. A switch cabinet, characterized in that, include: Cabinet; as well as, The grounding switch described in any one of claims 1 to 9, wherein the grounding switch is disposed within the cabinet.

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