Grounding switch with capability of repeatedly closing short-circuit current

Abstract

The invention relates to a grounding switch with capability of repeatedly closing short-circuit current, and belongs to the technical field of gas insulation switch cabinets. The grounding switch comprises a grounding contact and a bus contact. The grounding contact comprises a grounding arc contact, a grounding contact compartment plate, a grounding contact channel hole and a grounding contact supporting plate; the grounding arc contact is divided into independent compartments through the grounding contact compartment plate; the bus contact comprises a bus conductive contact, a bus arc contact and a bus contact arm; the grounding contact and the bus contact are both moving contacts; when the grounding arc contact is close to the bus arc contact and the distance between the grounding arc contact and the bus arc contact reaches a first breakdown distance, a discharge arc is generated, and the discharge arc occurs between the grounding arc contact and the bus arc contact; the bus arc contact completely enters the grounding arc contact independent compartment, and the grounding conductive contact and the bus conductive contact are effectively communicated. According to the grounding switch, the short-circuit current closing capability of the grounding switch is improved.

Description

Technical Field

[0001] This invention belongs to the field of gas-insulated switchgear, and particularly relates to a grounding switch with the capability to repeatedly close short-circuit currents. Background Technology

[0002] Gas-insulated switchgear, as a type of gas-insulated switchgear, traditionally uses sulfur hexafluoride as the main insulating gas. Its excellent chemical stability, good insulation and arc-extinguishing properties make it the primary insulating medium for gas-insulated switchgear, significantly reducing the size of the switchgear and improving its insulation performance. However, during the arc-extinguishing process, it decomposes into harmful gases, and its gas molecules pose a significant potential threat to the greenhouse effect, seriously threatening environmental safety. Therefore, nitrogen, dry air, or mixed gases have been introduced as insulating media. However, the insulation and arc-extinguishing properties of environmentally friendly gases are inferior to those of sulfur hexafluoride, resulting in poor short-circuit current closing capability of the grounding switch, typically only able to complete 1-2 short-circuit current closing operations. Summary of the Invention

[0003] To overcome the above-mentioned defects of the prior art, the present invention provides a grounding switch with the ability to close short-circuit current multiple times, so as to solve the shortcomings of the grounding switch in the prior art and improve the grounding switch's ability to close short-circuit current.

[0004] A grounding switch with the capability to close short-circuit current multiple times includes: grounding contacts and busbar contacts; The grounding contact includes a grounding arc contact, a grounding contact compartment plate, a grounding contact channel hole, and a grounding contact support plate; the grounding arc contact is divided into independent compartments by the grounding contact compartment plate; The busbar contact includes a busbar conductive contact, a busbar arc contact, and a busbar contact arm; Both the grounding contact and the busbar contact are moving contacts; When the grounding arc contact and the busbar arc contact are close to each other and the distance reaches the first breakdown distance, a discharge arc is generated. The discharge arc occurs between the grounding arc contact and the busbar arc contact. The busbar arc contact is fully inserted into the independent compartment of the grounding arc contact, and the grounding conductive contact and the busbar conductive contact are effectively connected.

[0005] Preferably, the grounding arc contact is a semi-circular arc-shaped cover, and a grounding contact channel hole is opened on the arc surface of the grounding arc contact corresponding to each independent compartment. A grounding contact support plate is fixed in the opening direction of the grounding arc contact to provide support and to seal each independent compartment.

[0006] Preferably, a through grounding busbar is arranged in the compartment of the grounding arc contact, and a grounding conductive contact is provided in the compartment of the grounding arc contact. The grounding conductive contact forms an electrical connection with the grounding busbar and the grounding arc contact, and the height of the grounding conductive contact is below the arc surface of the grounding arc contact.

[0007] Preferably, the grounding contact support plate is fixedly connected to the support shaft crank arm, the support shaft crank arm is fixedly connected to the support shaft, the support shaft crank arm provides rotational support for the grounding contact, and one end of the support shaft crank arm is connected to the grounding contact insulating rod through a pin, so that the grounding contact is subjected to the torque of the grounding contact insulating rod and rotates axially around the support shaft.

[0008] Preferably, the busbar contact is cylindrical.

[0009] Preferably, the busbar contact can be divided into two symmetrical semi-cylindrical lobes with similar shapes.

[0010] Preferably, the busbar contact can be divided into two semi-cylinders with a gap.

[0011] Preferably, the gap between the two semi-cylindrical halves is uniform or non-uniformly distributed.

[0012] Preferably, the grounding arc contact of the grounding contact is a semi-circular arc-shaped cover, and a channel hole is opened in the arc surface of the grounding contact. Each phase is formed into an independent compartment by a partition, and a grounding conductive contact is fixed in the independent compartment. The height of the grounding conductive contact is 3mm-10mm below the arc surface of the grounding arc contact. The grounding arc contact and the grounding conductive contact are made of copper-tungsten alloy CuW (40%-90%) or copper-molybdenum alloy CuMo (40%-90%).

[0013] Preferably, the busbar contact is semi-cylindrical in shape, divided into two symmetrical halves with similar shapes. The busbar conductive contact is fixedly connected to the tangential surface of the busbar arc contact in one direction and is located within its arc surface. The busbar arc contact is also connected to the contact arm to form a complete busbar contact. The busbar conductive contact is made of T2 copper Cu (99.9%), copper-tungsten alloy CuW (40%-90%), or copper-molybdenum alloy CuMo (40%-90%). The busbar arc contact is made of copper-tungsten alloy CuW (40%-90%) or copper-molybdenum alloy CuMo (40%-90%). The contact arm is made of T2 copper Cu (99.9%).

[0014] Beneficial technical effects: This invention discloses a grounding switch with the capability to close short-circuit currents multiple times. The arc contact and conductive contact are designed separately, which reduces the likelihood of conductive contact welding when closing short-circuit current. The parallel arc discharge on both sides reduces the current magnitude in the parallel arc and increases the arc heat dissipation volume. The integrated shell-type grounding arc contact further increases the heat dissipation volume when closing short-circuit current, improving the cooling effect. The arc-shaped non-uniform electric field design shortens the arc time of pre-breakdown discharge during closing. After discharge, the arc bends upward under the action of electrodynamic force, increasing the arc length and arc voltage, achieving the minimum arc discharge energy and reducing the ablation of the arc contact by the arc generated during the closing process. The hot gas generated by the minimum arc discharge heats the gas in the independent compartment where the grounding contact is located, generating a certain gas pressure. The hot gas is released outward through the grounding contact channel hole, carrying away heat, which can complete the closing of multiple short-circuit currents and improve the opening and closing capability of the grounding switch. Attached Figure Description

[0015] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1a This is a perspective view of the grounding switch in Embodiment 1 of the present invention.

[0016] Figure 1b This is a perspective view of the grounding switch in Embodiment 2 of the present invention.

[0017] Figure 2a This is a side view of the grounding switch in the open state according to Embodiment 1 of the present invention.

[0018] Figure 2b This is a side view of the grounding switch in the open state according to Embodiment 2 of the present invention.

[0019] Figure 3a This is a side view of the grounding switch closing arc state in Embodiment 1 of the present invention.

[0020] Figure 3b This is a side view of the grounding switch closing arc state in Embodiment 2 of the present invention.

[0021] Figure 4a This is a side view of the grounding switch in the closed state according to Embodiment 1 of the present invention.

[0022] Figure 4b This is a side view of the grounding switch in the closed state according to Embodiment 2 of the present invention.

[0023] Figure 5 This is a structural diagram of the grounding contact of the grounding switch of the present invention.

[0024] Figure 6 This is a structural diagram of the grounding switch busbar contact of the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. The described embodiments are merely some, not all, of the embodiments of this invention. The components of the embodiments of this invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. It should be understood that the specific embodiments described are merely for explaining or illustrating the invention and are not intended to limit the scope of the invention. Furthermore, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily obscuring the concept of the invention.

[0026] In the description of this invention, it should be noted that the orientation or positional relationships such as "front," "middle," "rear," "upper," "middle," and "lower" are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0027] In the description of this invention, it should be noted that the terms "installation," "fixing," "connection," and "communication" are interpreted broadly. "Installation" not only refers to setting components in a predetermined position through conventional mechanical assembly, but also includes temporary or detachable placement, integrated setup, and indirect installation through a medium. "Fixing" does not only refer to non-detachable rigid connections, but also includes constraints that ensure relative positional stability. "Connection" encompasses various forms of connection between components, including but not limited to mechanical connections, electrical connections, and indirect connections. "Communication" emphasizes the formation of an interactive channel or association between two or more objects, including but not limited to physical pathway connections and signal connections such as electrical signals and electromagnetic signals that can be transmitted between devices or systems. This broad interpretation aims to avoid excluding reasonable technical implementations due to limitations in the description, and to ensure that the scope of protection of this invention can cover all equivalent technical solutions based on the same inventive concept.

[0028] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0029] Example 1: like Figure 1a , Figure 5 As shown, the grounding contact 1 includes a grounding arc contact 101, a grounding contact compartment plate 102, a grounding contact channel hole 103, and a grounding contact support plate 104. The grounding arc contact 101 is a semi-circular arc-shaped cover, optionally an arc-shaped cover, or optionally an elliptical cover, so that the electric field of the grounding arc contact 101 is evenly distributed. The grounding arc contact 101 is divided into independent compartments by the grounding contact compartment plate 102, and a grounding contact channel hole 103 is opened on the arc surface of the grounding arc contact 101 corresponding to each independent compartment. The grounding contact support plate 104 is fixed in the opening direction of the grounding arc contact 101, providing support and sealing each independent compartment.

[0030] A grounding busbar 3 is arranged through the compartment of the grounding arc contact 101. At the same time, a grounding conductive contact 2 is provided in the compartment of the grounding arc contact 101. The grounding conductive contact 2 forms an effective electrical connection with the grounding busbar 3 and the grounding arc contact 101. In order to generate the closing arc on the surface of the grounding arc contact 101, the height of the grounding conductive contact 2 is below or within a preset distance of the arc surface of the grounding arc contact 101. It can be understood that the distance between the grounding conductive contact 2 and the inner arc surface of the grounding arc contact 101 is a preset distance. Preferably, the height of the grounding conductive contact 2 is 3~10mm below the arc surface of the grounding arc contact 101.

[0031] The grounding contact support plate 104 is fixedly connected to the support shaft crank arm 5, which is fixedly connected to the support shaft 4. The support shaft crank arm 5 provides rotational support for the grounding contact 1. One end of the support shaft crank arm 5 is connected to the grounding contact insulating rod 6 through a shaft pin, thereby causing the grounding contact 1 to rotate axially around the support shaft 4 under the torque of the grounding contact insulating rod 6.

[0032] like Figure 1a , Figure 6As shown, the busbar contact 7 includes a busbar conductive contact 701, a busbar arc contact 702, and a busbar contact arm 703. The busbar contact 7 is cylindrical in shape. Optionally, the busbar contact 7 can be divided into two symmetrical semi-cylindrical halves with similar shapes. Optionally, the busbar contact 7 can be divided into two semi-cylindrical halves with a gap, and a connecting key is provided between the two semi-cylindrical halves. Optionally, the distance between the two semi-cylindrical halves is not uniformly distributed, and the distance at one end of the two semi-cylindrical halves is greater than the distance at the other end. For example, the gap or distance between the two semi-cylindrical halves located at the upper end is 0.1-5mm, and the gap or distance between the two semi-cylindrical halves located at the upper end is 0.2-6mm. The bilobed cylindrical busbar contact 7 can effectively uniformly distribute its electric field. The busbar conductive contact 701 is fixedly connected to the tangential surface of the busbar arc contact 702 in one direction and is effectively electrically connected. The busbar conductive contact 701 is located within the arc surface of the busbar arc contact 702 to ensure that an electric arc is generated in the busbar contact 7 during the closing process. The busbar arc contact 702 is fixedly connected to the busbar contact arm 703 and is effectively electrically connected to form a conductive whole. Optionally, the busbar contact 7 is provided with a concave hole for fixing. A clamping torque is generated by bolts and springs to make the symmetrical two bilobed semi-cylindrical busbar contact 7, ensuring that the grounding contact 1 and the busbar contact 7 are effectively electrically connected when closed.

[0033] The busbar contact 7 is movably connected to the grounding contact insulating rod 6 and the busbar contact insulating rod 8 via a pivot pin. The lower end of the busbar contact 7 is fixed to the busbar contact conductive seat 11 via a pivot pin. The moving busbar contact insulating rod 8 drives the busbar contact 7 to rotate around the fixed point of the contact conductive seat 11, while simultaneously pushing the grounding contact insulating rod 6 to move.

[0034] The busbar contact conductive base 11 is connected to the busbar 12 and is effectively electrically connected, and is supported and fixed by the busbar contact insulating base.

[0035] The other end of the busbar contact insulating rod 8 is connected to the drive shaft crank arm 9 via a shaft pin, and the drive shaft crank arm 9 is fixed to the drive shaft 10.

[0036] The rotational torque applied to the drive shaft 10 by the operating mechanism causes the busbar contact 7 to move axially along the fixing bolt of its conductive seat 11, and at the same time causes the grounding contact 1 to move axially around the support shaft 4, thereby realizing the separation or closure of the grounding conductive contact 2 of the grounding contact 1 and the busbar conductive contact 701 of the busbar contact 7.

[0037] As shown in Figure 2, the grounding switch is in the open state, and the grounding contact 1 and the bus contact 7 are in the effective open state.

[0038] like Figure 1a , Figure 2a , Figure 3aAs shown, when a correct axial rotational force is applied to the drive shaft 10, the drive shaft 10 drives the drive shaft crank arm 9 to rotate accordingly. The drive shaft crank arm 9 drives the grounding contact 1 and the busbar contact 7 to rotate simultaneously, causing the grounding arc contact 101 and the busbar arc contact 702 to move closer together. When the proximity distance reaches 15-20mm (the first breakdown distance), a discharge arc will be generated. The discharge arc occurs between the grounding arc contact 101 and the busbar arc contact 702. Due to their material properties, the grounding arc contact 101 and the busbar arc contact 702 can withstand arc erosion without burning out. The busbar contact 7 is formed by fusion welding and is divided into two symmetrical halves. The arc discharge on both sides of the busbar contact 7 reduces the arc current and increases the arc heat dissipation volume. The integrated shell-type grounding arc contact further increases the heat dissipation volume and enhances the arc cooling effect. The slightly non-uniform electric field design shortens the arc time of discharge during closing. After the discharge occurs, the arc will bend upward under the action of electrodynamic force to increase the arc length and increase the arc voltage, thereby achieving the minimum arc discharge energy and reducing the ablation of the arc contact by the closing arc. The hot gas generated by the minimum arc discharge is in an independent compartment, generating a certain pressure, and is released outward through the grounding contact channel hole to carry away the heat.

[0039] Both the grounding contact 1 and the busbar contact 7 are moving contacts, which increases the closing speed of the grounding contact 1 and the busbar contact 7, shortens the closing time, and also shortens the arc time during discharge.

[0040] Furthermore, the busbar arc contact 702 is fully inserted into the independent compartment of the grounding arc contact 101, and the grounding conductive contact 102 and the busbar conductive contact 701 are effectively connected. Due to the material properties, the grounding conductive contact 102 and the busbar conductive contact 701 have good conductivity, reducing contact resistance.

[0041] like Figure 4a As shown, the grounding switch is in the closed state, the grounding contact 1 is effectively connected to the bus contact 7, and the main circuit is in the grounded state.

[0042] Example 1: like Figure 1b , Figure 5 As shown, the grounding contact 1 includes a grounding arc contact 101, a grounding contact compartment plate 102, a grounding contact channel hole 103, and a grounding contact support plate 104. The grounding arc contact 101 is generally close to a semi-circular arc-shaped cover to uniformly distribute the electric field of the grounding arc contact 101. The grounding arc contact 101 is divided into independent compartments by the grounding contact compartment plate 102, and a grounding contact channel hole 103 is opened on the arc surface of the grounding arc contact 101 corresponding to each independent compartment. The grounding contact support plate 104 is fixed in the opening direction of the grounding arc contact 101 to provide support and to close each independent compartment.

[0043] Inside the compartment of the grounding arc contact 101, a through grounding busbar 3 is arranged. At the same time, a grounding conductive contact 2 is installed inside the compartment of the grounding arc contact 101. The grounding conductive contact 2 forms an effective electrical connection with the grounding busbar 3 and the grounding arc contact 101. In order to generate the closing arc on the surface of the grounding arc contact 101, the height of the grounding conductive contact 2 is 3~10mm below the arc surface of the grounding arc contact 101.

[0044] The grounding contact support plate 104 is fixedly connected to the drive crank arm 9, and the drive crank arm 9 is fixedly connected to the drive shaft 10. The drive crank arm 9 provides rotational support for the grounding contact 1. One end of the drive crank arm 9 is connected to the grounding contact insulating rod 6 through a shaft pin. The rotating drive shaft 10 can drive the grounding contact insulating rod 6 to move.

[0045] like Figure 1b , Figure 6 As shown, the busbar contact 7 includes a busbar conductive contact 701, a busbar arc contact 702, and a busbar contact arm 703. The busbar contact 7 is semi-cylindrical in shape, divided into two symmetrical halves with similar shapes. The semi-cylindrical shape of the busbar contact 7 can effectively uniformly distribute its electric field. The busbar conductive contact 701 is fixedly connected to one directional tangential surface of the busbar arc contact 702 and is effectively electrically connected. The busbar conductive contact 701 is located within the arc surface of the busbar arc contact 702 to ensure that an electric arc is generated in the busbar contact 7 during the closing process. The busbar arc contact 702 and the busbar contact arm 703 are fixedly connected and effectively electrically connected to form a conductive whole. The busbar contact 7 is provided with a concave hole for fixing. A clamping torque is generated between the two symmetrical halves of the busbar contact 7 by bolts and springs to ensure effective electrical connection between the grounding contact 1 and the busbar contact 7 when closing.

[0046] The busbar contact 7 is movably connected to the grounding contact insulating rod 6 via a shaft pin. The lower end of the busbar contact 7 is fixed to the busbar contact conductive seat 11 via a shaft pin. The moving grounding contact insulating rod 6 drives the busbar contact 7 to rotate around the fixed point of the contact busbar contact conductive seat 11.

[0047] The busbar contact conductive base 11 is connected to the busbar 12 and is effectively electrically connected, and is supported and fixed by the busbar contact insulating base 13.

[0048] The rotational torque applied to the drive shaft 10 by the operating mechanism causes the grounding contact 1 to move axially around the drive shaft 10, while simultaneously driving the busbar contact 7 to move axially along the fixing bolt of its busbar contact conductive seat 11, thereby realizing the separation or closure of the grounding conductive contact 2 of the grounding contact 1 and the busbar conductive contact 701 of the busbar contact 7.

[0049] like Figure 2b As shown, the grounding switch is in the open state, and the grounding contact 1 and the bus contact 7 are in the effective open state.

[0050] like Figure 1b , Figure 2b , Figure 3b As shown, when a correct axial rotational force is applied to the drive shaft 10, the drive shaft 10 drives the drive crank arm 9 to rotate accordingly. The drive crank arm 9 drives the grounding contact 1 and the busbar contact 7 to rotate simultaneously, causing the grounding arc contact 101 and the busbar arc contact 702 to move closer together. When the proximity reaches the second breakdown distance (10~30mm), a discharge arc will be generated. The discharge arc occurs between the grounding arc contact 101 and the busbar arc contact 702. Due to their material properties, the grounding arc contact 101 and the busbar arc contact 702 can withstand arc erosion without fusion welding, and the busbar arc contact 702 is divided into two symmetrical halves. The line contact 7 and the busbar contact 7 have arc discharge on both sides, which reduces the arc current and increases the arc heat dissipation volume. The integrated shell-type grounding arc contact further increases the heat dissipation volume and enhances the arc cooling effect. The non-uniform electric field design generated by the arc surface shortens the arc time when closing. After the discharge occurs, the arc will bend upward under the action of electrodynamic force, increasing the arc length and improving the arc voltage, thereby achieving the minimum arc discharge energy and reducing the ablation of the arc contact by the closing arc. The hot gas generated by the minimum arc discharge is in an independent compartment, generating a certain gas pressure, which is released to the outside through the grounding contact channel hole and carries away the heat.

[0051] Both the grounding contact 1 and the busbar contact 7 are moving contacts, which increases the closing speed of the grounding contact 1 and the busbar contact 7, shortens the closing time, and also shortens the arc time during discharge.

[0052] Furthermore, the busbar arc contact 702 is fully inserted into the independent compartment of the grounding arc contact 101, and the grounding conductive contact 102 and the busbar conductive contact 701 are effectively connected. Due to the material properties, the grounding conductive contact 102 and the busbar conductive contact 701 have good conductivity, reducing contact resistance.

[0053] like Figure 4b As shown, the grounding switch is in the closed state, the grounding contact 1 is effectively connected to the bus contact 7, and the main circuit is in the grounded state.

[0054] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0055] It should be noted that the sequence numbers of the embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0056] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, and any combination of embodiments or solutions, are similarly included within the patent protection scope of the present invention.

Claims

1. A grounding switch with the capability to repeatedly close short-circuit currents, characterized in that, include: Grounding contacts and busbar contacts; The grounding contact includes a grounding arc contact, a grounding contact compartment plate, a grounding contact channel hole, and a grounding contact support plate; the grounding arc contact is divided into independent compartments by the grounding contact compartment plate; The busbar contact includes a busbar conductive contact, a busbar arc contact, and a busbar contact arm; Both the grounding contact and the busbar contact are moving contacts; When the grounding arc contact and the busbar arc contact are close to each other and the distance reaches the first breakdown distance, a discharge arc is generated. The discharge arc occurs between the grounding arc contact and the busbar arc contact. The busbar arc contact is fully inserted into the independent compartment of the grounding arc contact, and the grounding conductive contact and the busbar conductive contact are effectively connected.

2. The grounding switch as described in claim 1, characterized in that, The grounding arc contact is a semi-circular arc-shaped cover. Grounding contact channel holes are opened on the arc surface of the grounding arc contact corresponding to each independent compartment. A grounding contact support plate is fixed in the opening direction of the grounding arc contact to provide support and to seal each independent compartment.

3. The grounding switch as described in claim 1, characterized in that, The compartment of the grounding arc contact has a through grounding busbar, and a grounding conductive contact is provided in the compartment of the grounding arc contact. The grounding conductive contact is electrically connected to the grounding busbar and the grounding arc contact, and the height of the grounding conductive contact is below the arc surface of the grounding arc contact.

4. The grounding switch as described in claim 1, characterized in that, The grounding contact support plate is fixedly connected to the support shaft crank arm, which is fixedly connected to the support shaft. The support shaft crank arm provides rotational support for the grounding contact. One end of the support shaft crank arm is connected to the grounding contact insulating rod through a pin, thereby causing the grounding contact to rotate axially around the support shaft due to the torque exerted by the grounding contact insulating rod.

5. The grounding switch as described in claim 1, characterized in that, The busbar contact is cylindrical.

6. The grounding switch as described in claim 5, characterized in that, The busbar contact can be divided into two symmetrical semi-cylindrical lobes with similar shapes.

7. The grounding switch as described in claim 5, characterized in that, The busbar contact can be divided into two semi-cylinders with a gap.

8. The grounding switch as described in claim 7, characterized in that, The gap between the two semi-cylinders may be uniform or non-uniformly distributed.

9. The grounding switch as described in claim 1, characterized in that, The grounding arc contact of the grounding contact is a semi-circular arc-shaped cover. A channel hole is opened in the arc surface of the grounding contact, and each phase is formed into an independent compartment by a partition. A grounding conductive contact is fixed in the independent compartment. The height of the grounding conductive contact is 3mm-10mm below the arc surface of the grounding arc contact. The grounding arc contact and the grounding conductive contact are made of copper-tungsten alloy CuW (40%-90%) or copper-molybdenum alloy CuMo (40%-90%).

10. The grounding switch as described in claim 1, characterized in that, The busbar contact is semi-cylindrical in shape, divided into two symmetrical halves with similar shapes. The busbar conductive contact is fixedly connected to the tangential surface of the busbar arc contact in one direction and is located within its arc surface. The busbar arc contact is also connected to the contact arm to form a complete busbar contact. The busbar conductive contact is made of T2 copper Cu (99.9%), copper-tungsten alloy CuW (40%-90%), or copper-molybdenum alloy CuMo (40%-90%). The busbar arc contact is made of copper-tungsten alloy CuW (40%-90%) or copper-molybdenum alloy CuMo (40%-90%). The contact arm is made of T2 copper Cu (99.9%).

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