Grounding switch taking environment-friendly gas as insulating medium

Abstract

The invention provides a grounding switch taking environment-friendly gas as an insulating medium. The grounding switch comprises a shell, and a transmission mechanism assembly, a grounding knife switch assembly, a moving side arc contact assembly and a static side arc contact assembly which are arranged in the shell, one end of the transmission mechanism assembly is connected with the output end of an external operating mechanism, the other end of the transmission mechanism assembly is connected with the grounding knife switch assembly, the transmission mechanism assembly is further connected with a grounding assembly, the moving side arc contact assembly is arranged at the action end of the grounding knife switch assembly, and the static side arc contact assembly is arranged on a bus side conductor. And the transmission mechanism assembly is controlled to act, and the grounding knife switch assembly drives the moving side arc contact assembly to do linear motion and to be in contact with or separated from the static side arc contact assembly, so that the grounding switch executes opening and closing. The circuit breaker has the advantages of being reasonable in structure, low in cost, reliable in action, stable in insulation performance and high in ablation resistance, and circuit opening and closing can be completed under an environment-friendly gas medium.

Description

Technical Field

[0001] The present application belongs to the technical field of high-voltage switches, and in particular relates to a grounding switch using environmentally friendly gas as an insulating medium. Background Art

[0002] As the global urgency of addressing climate change intensifies, the power industry holds the key to carbon emissions reduction. Numerous countries and regions around the world have proposed carbon neutrality targets through legislation, agreements, policy pledges, and verbal commitments. Based on McKinsey's Global Carbon Neutrality Model, to achieve the 1.5°C temperature target, the global power industry needs to reduce carbon emissions by over 99% by 2050, nearly reaching "net zero." This indicates that the decarbonization of power equipment within the power industry has become a core focus of technological innovation within the energy sector.

[0003] As a critical control element in power systems, gas-insulated metal-enclosed switchgear (GIS) has long relied on sulfur hexafluoride (SF6) as its insulation and arc-extinguishing medium. This is due to SF6's strong insulation properties (approximately three times that of air), making it suitable for compact designs, and its excellent arc-extinguishing performance, making it suitable for high-current interruption. However, its high global warming potential (GWP) of 23,500 times poses a significant challenge to achieving the dual carbon goals. The Kyoto Protocol, signed in 1997 by the Parties to the United Nations Convention on Climate Change, listed SF6 as one of six restricted greenhouse gases and mandated restrictions on its use. The EU F-gas Regulation further mandates the phase-out of most fluorinated gas-based power equipment by 2030. Against this backdrop, the development of environmentally friendly, SF6-free GIS has become an industry imperative. As a core component of GIS, the earthing switch utilizes an environmentally friendly gas as its insulation medium, placing higher demands on the device's structural strength, insulation performance, and sealing properties.

[0004] At present, common grounding switches have the following structures: manual transmission + direct-acting knife switch structure, which requires large operating torque and has low efficiency; electric transmission + plug-in knife switch structure, which requires strict alignment of the knife switch, is complex to install, and is unreliable in operation; spring energy storage transmission + rotary knife switch structure, which requires regular replacement of spring fatigue and is costly. Therefore, the above types of grounding switches do not meet actual work needs. Summary of the Invention

[0005] In view of this, the present application aims to provide a grounding switch using environmentally friendly gas as an insulating medium to solve at least one of the above problems.

[0006] To achieve the above objectives, the technical solution of this application is implemented as follows: The present application provides a grounding switch using environmentally friendly gas as an insulating medium, comprising a housing, and a transmission mechanism assembly, a grounding switch assembly, a moving side arcing contact assembly, and a stationary side arcing contact assembly arranged in the housing; One end of the transmission mechanism assembly is connected to the output end of the operating mechanism of the external device, and the other end of the transmission mechanism is connected to the grounding switch assembly. The transmission mechanism assembly is also connected to the grounding assembly. The moving side arc contact assembly is arranged at the action end of the grounding switch assembly, and the static side arc contact assembly is arranged on the busbar side conductor; The transmission mechanism assembly is controlled to drive the moving side arc contact assembly to perform linear motion through the grounding switch assembly, and to contact or separate with the static side arc contact assembly, so that the grounding switch is opened and closed.

[0007] Furthermore, the transmission mechanism assembly is composed of a support bracket, a transmission shaft, a crank arm and a needle roller; The support bracket is fixed to the housing by bolts to support the transmission shaft. The output shaft of the operating mechanism is connected to the transmission shaft. The transmission shaft and the crank arm are engaged through splines. The crank arm is connected to the transmission plate through a needle roller. The transmission plate is assembled with the grounding switch through a transmission insulating plate.

[0008] Furthermore, the grounding switch assembly is composed of three grounding switch mechanisms, wherein the grounding switch mechanism includes a conductive rod, one end of which is fixedly connected to the transmission insulating plate; A support plate is provided on the housing, and a conductor seat for mounting the conductive rod is installed on one side of the support plate. The conductive rod passes through the conductor seat and the support plate and is assembled and connected with the moving-side arc contact.

[0009] Furthermore, a supporting pressure plate is provided on the other side of the supporting plate, and the supporting pressure plate is provided with a moving side shielding cover through two connecting rods.

[0010] Furthermore, guide rings are respectively installed between the conductor seat, the support plate and the conductive rod; At least two circles of watchband contact fingers are arranged between the conductor seat and the conductive rod.

[0011] Furthermore, the grounding assembly consists of a grounding insulator and a conductive bar, the grounding insulator is mounted on the housing by bolt connection, and the conductive bar is connected between the conductor base and the grounding insulator metal insert.

[0012] Furthermore, the moving-side arc contact assembly includes a moving contact, which is arranged at the end of the conductive rod. The moving contact is made of copper, and the surface in contact with the static-side arc contact assembly is plated with a silver coating.

[0013] Furthermore, the static side arc contact assembly is composed of a supporting contact seat, a static side shielding cover, a guide ring, a static contact, a static arc contact finger and a limit contact seat; The support contact seat is hollow inside and is fixed to the busbar-side conductor by bolts. The guide ring limits the support contact seat to the end close to the moving contact through the static arc contact finger. The limiting contact seat is sleeved on the static arc contact finger, and a spring is provided between the static arc contact finger and the limiting contact seat. The static contact is open and threadedly connected to the limit contact seat. The static side shielding cover is a semi-enclosed structure and is installed on the support contact seat. The outer wall surface of the static side shielding cover and the outer wall surface of the static contact form an arc-shaped envelope surface.

[0014] Furthermore, the arc region of the static arc contact finger facing away from the spring is tangent to the outer wall of the support contact seat.

[0015] Furthermore, the inner wall of the top end of the static arc contact finger and the static contact are both provided with a copper-tungsten alloy ablation-resistant structure.

[0016] Compared with the prior art, the grounding switch using environmentally friendly gas as the insulating medium described in this application has the following beneficial effects: The earthing switch described in this application uses environmentally friendly gas as the insulating medium, which has the working characteristics of low cost, reliable movement, strong parts replaceability, reasonable structure, stable insulation performance, and strong anti-ablation ability, and can complete line opening and closing under environmentally friendly gas medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings: Figure 1 This is a schematic diagram of opening a grounding switch using environmentally friendly gas as an insulating medium according to an embodiment of the present application; Figure 2 This is a schematic diagram of closing a grounding switch using environmentally friendly gas as an insulating medium according to an embodiment of the present application; Figure 3 This is a schematic diagram of the assembly structure of the grounding switch according to an embodiment of the present application; Figure 4 This is a schematic diagram of the internal structure installation of the housing according to an embodiment of the present application; Figure 5 This is a schematic diagram of the assembly of the static side arcing contact according to an embodiment of the present application; Figure 6 This is a schematic diagram of the first angle structure of the transmission mechanism according to the embodiment of the present application; Figure 7This is a schematic diagram of the second angle structure of the transmission mechanism assembly described in an embodiment of the present application.

[0018] Description of reference numerals: 1-Transmission plate; 2-Transmission insulation plate; 3-Conductive rod; 4-Conductive bar; 5-Guide ring; 6-Strap contact finger; 7-Moving contact; 8-Moving side shielding cover; 9-Support pressure plate; 10-Support plate; 11-Conductor seat; 12-Support contact seat; 13-Static side shielding cover; 14-Guide ring; 15-Static contact; 16-Spring; 17-Static arc contact finger; 18-Limiting contact seat; 19-Support bracket; 20-Transmission shaft; 21-Crank arm; 22-Needle roller; 23-Grounding insulator; 24-Housing. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of this application more clear, this application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0020] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in the embodiments of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] See also Figures 1 to 7 As shown, this embodiment provides a grounding switch using environmentally friendly gas as an insulating medium, including a housing 24, and a transmission mechanism assembly, a grounding switch assembly, a moving side arcing contact assembly, and a stationary side arcing contact assembly disposed in the housing 24; One end of the transmission mechanism assembly is connected to the output end of the operating mechanism of the peripheral device, and the other end of the transmission mechanism is connected to the grounding switch assembly. The transmission mechanism assembly is also connected to the grounding assembly. The moving side arc contact assembly is set at the action end of the grounding switch assembly, and the static side arc contact assembly is set on the busbar side conductor; Control the movement of the transmission mechanism assembly, drive the moving side arc contact assembly to make linear motion through the grounding switch assembly, and contact or separate with the static side arc contact assembly, so that the grounding switch can be opened and closed.

[0022] Specifically, in this embodiment, the operating mechanism is powered by a motor, which drives the grounding switch assembly through a transmission mechanism assembly. The grounding switch assembly moves linearly through a multi-stage guide, and the moving side arc contact assembly at the front end gradually approaches the static side arc contact assembly. When the distance reaches the maximum discharge distance, arcing occurs, i.e., pre-breakdown, until the moving contact 7 touches the static contact 15, the arc is extinguished, and after a period of stability, it finally reaches a fully closed position.

[0023] The grounding switch using environmentally friendly gas as the insulating medium described in this embodiment has the working characteristics of low cost, reliable movement, strong parts replaceability, reasonable structure, stable insulation performance, and strong anti-ablation ability, and can complete line opening and closing in an environmentally friendly gas medium.

[0024] In some embodiments, as Figure 6 and Figure 7 As shown, the transmission mechanism assembly consists of a support bracket 19, a transmission shaft 20, a crank arm 21 and a needle roller 22; The support bracket 19 is fixed to the housing 24 by bolts to support the transmission shaft 20. The output shaft of the operating mechanism is connected to the transmission shaft 20. The transmission shaft 20 is engaged with the crank arm 21 through a spline. The crank arm 21 is connected to the transmission plate 1 through the needle roller 22. The transmission plate 1 is assembled with the grounding knife switch through the transmission insulating plate 2.

[0025] Specifically, in this embodiment, the opening and closing positions are designed to be 60°, meaning that the transmission shaft 20 rotates 60° to complete the switch opening and closing operation. The support bracket 19 is bolted to the housing 24 to support the transmission shaft 20. The output shaft of the operating mechanism (not shown) is splined to the transmission shaft 20 and the crank arm 21, ensuring smooth transmission and reliable movement. The spline has positioning teeth to ensure the accuracy of the initial opening and closing positions. The crank arm 21 is connected to the transmission plate 1 via a needle roller 22. The greatest advantages are simple and reliable transmission and long mechanical life. In addition, the needle roller 22 significantly reduces the size of the housing 24 cavity, making it more economical and significantly saving costs.

[0026] In some embodiments, as Figure 3 and Figure 4 As shown, the grounding switch assembly consists of three grounding switch mechanisms, wherein the grounding switch mechanism includes a conductive rod 3, one end of which is fixedly connected to the transmission insulating plate 2; A support plate 10 is provided on the housing 24 , and a conductor seat 11 for mounting the conductive rod 3 is installed on one side of the support plate 10 . The conductive rod 3 passes through the conductor seat 11 and the support plate 10 and is assembled and connected with the moving side arc contact.

[0027] Specifically, in this embodiment, the grounding knife switch is assembled using a direct-acting knife switch, and the moving contact 7 directly contacts the static contact 15 through linear motion. The transmission structure is simple and reliable, with a low failure rate. The reciprocating motion stroke of the moving contact 7 is 120 mm, the motion path is fixed, the contact pressure is uniform, and the contact resistance is stable.

[0028] The moving contact 7 of the moving side arc contact assembly is installed on the conductive rod 3. The conductive rod 3, the transmission insulating plate 2, and the transmission plate 1 are fixed together by bolts. The support plate 10 is fixed to the shell 24 by bolts. A conductor seat 11 is installed on one side, and a support pressure plate 9 is welded on the other side. Two circles of strap contacts 6 are installed inside the conductor seat 11. The use of double-ring redundant contact makes the conductive rod 3 and the conductor seat 11 have more contact points, greatly reducing the contact resistance and evenly distributing the current. In high-voltage and high-current scenarios, it has the advantages of high reliability, low resistance, and wear resistance; the two circles of guide rings 5 inside the conductor seat 11 and the support plate 10 are used to guide the conductive rod 3 to ensure that it achieves linear motion. The double-ring design is conducive to reducing friction and component wear.

[0029] In some embodiments, as Figure 1 and Figure 2 As shown, the grounding assembly consists of a grounding insulator 23 and a conductive bar 4 . The grounding insulator 23 is mounted on the housing 24 by bolt connection, and the conductive bar 4 is connected between the conductor base 11 and the metal insert of the grounding insulator 23 .

[0030] Specifically, in this embodiment, a connecting block is welded on the conductor base 11 for connecting the grounding assembly. The grounding assembly is composed of a grounding insulator 23 and a conductive bar 4. The grounding insulator 23 is installed on the shell 24 by bolts. The conductive bar 4 is connected between the conductor base 11 and the metal insert of the grounding insulator 23 to achieve grounding. The conductive bar 4 of this embodiment adopts a rigid connection method. Compared with the soft connection, the rigid copper bar has a large contact area, low resistance, excellent conductivity, high mechanical strength, strong tensile and compressive resistance, and an expansion joint is added to the copper bar to relieve thermal stress.

[0031] In some embodiments, as Figure 1 and Figure 2 As shown, the moving side arc contact assembly includes a moving contact 7, which is arranged at the end of the conductive rod 3. The moving contact 7 is made of copper, and the surface in contact with the static side arc contact assembly is plated with a silver coating.

[0032] Specifically, in this embodiment, the moving contact 7 is made of copper, and the contact surface with the static contact 15 is silver-plated to reduce contact resistance, improve conductivity and inhibit arc erosion. The moving contact 7 is connected to the conductive rod 3 by bolts.

[0033] Two connecting rods are welded under each supporting pressure plate 9, and a moving side shielding cover 8 is installed at the other end of the connecting rod. When the grounding switch is opened and closed, a high electric field area will be formed between the moving contact 7 and the static contact 15. Installing the moving side shielding cover 8 can optimize the electric field distribution, suppress the impact of arc and protect the insulation performance of the equipment, which is beneficial to improving the safety and reliability of the equipment.

[0034] In some embodiments, as Figure 5 As shown, the static side arc contact assembly consists of a supporting contact seat 12, a static side shielding cover 13, a guide ring 14, a static contact 15, a static arc contact finger 17 and a limit contact seat 18; The support contact seat 12 is hollow inside and is fixed to the busbar-side conductor by bolts. The guide ring 14 limits the support contact seat 12 to the end close to the moving contact 7 via the static arc contact finger 17. The limit contact seat 18 is sleeved on the static arc contact finger 17, and a spring 16 is provided between the static arc contact finger 17 and the limit contact seat 18. The static contact 15 is open and threadedly connected to the limit contact seat 18. The static side shielding cover 13 is a semi-enclosed structure and is installed on the support contact seat 12. The outer wall surface of the static side shielding cover 13 and the outer wall surface of the static contact 15 form an arc-shaped envelope surface.

[0035] Specifically, in this embodiment, when the device performs a closing motion, an operating mechanism (not shown) provides power to drive the crank arm 21 to rotate clockwise. The crank arm 21, via the needle roller 22, toggles the knife switch. The support plate 10 acts as a guide to ensure that the knife switch moves linearly until the moving contact 7 moves to the specified position, achieving the closing operation. Similarly, when the crank arm 21 rotates counterclockwise, the knife switch drives the contact 7 to move linearly. When it moves in the opposite direction to the specified position, the opening operation is achieved.

[0036] In this embodiment, the static side arc contact assembly includes a static contact 15, which is connected to the limit contact seat 18 by threads, and the support contact seat 12 is installed on the bus side conductor (not shown in the figure) by bolts. The head of the static contact 15 is added with copper-tungsten alloy and is made into an open form to better contact with the moving side contact.

[0037] A static side shielding cover 13 is also added to the outside of the supporting contact seat 12. The static side shielding cover 13 adopts a semi-enclosed form. In addition to being able to uniform the electric field, suppress arcs, reduce electromagnetic interference, and improve the insulation strength of the equipment, it can also protect the contacts from dirt and moisture.

[0038] A static arc contact finger 17 is also installed in the internal groove of the support contact base 12. The static arc contact fingers 17 are arranged around the support base. A guide ring 14 is installed on the upper end of the support contact base 12. Multiple independent static arc contact fingers 17 are pressed against the guide ring 14 by a spring 16. The limit contact base 18 and the static side shielding cover 13 are fixed to the support contact base 12 by bolts. The arc area on the side of the static arc contact finger 17 away from the spring 16 is tangent to the outer wall of the support contact base 12 to form a distributed contact. The preload force of the spring 16 can ensure that during the closing operation, when the moving contact 7 is inserted, the static arc contact finger 17 is in close contact with the moving contact 7. During the opening operation, the elastic force of the spring 16 also helps to quickly separate the contacts and reduce the arc duration. In addition, the top inner wall of the static arc contact finger 17 and the static contact 15 are both provided with a copper-tungsten alloy ablation-resistant structure. When the moving contact 7 moves toward the static contact 15, the generated arc is preferentially concentrated on the copper-tungsten alloy part. Since the copper-tungsten alloy has the characteristics of ablation resistance and high temperature resistance, the moving and static contacts 15 can be smoothly opened and closed.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

[0040] The embodiments of the present application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of this application.

Claims

1. A grounding switch using environmentally friendly gas as the insulating medium, characterized by: It includes a housing, and a transmission mechanism assembly, a grounding switch assembly, a moving side arc contact assembly and a static side arc contact assembly arranged in the housing; One end of the transmission mechanism assembly is connected to the output end of the operating mechanism of the external device, and the other end of the transmission mechanism is connected to the grounding switch assembly. The transmission mechanism assembly is also connected to the grounding assembly. The moving side arc contact assembly is arranged at the action end of the grounding switch assembly, and the static side arc contact assembly is arranged on the busbar side conductor; The transmission mechanism assembly is controlled to drive the moving side arc contact assembly to perform linear motion through the grounding switch assembly, and to contact or separate with the static side arc contact assembly, so that the grounding switch is opened and closed.

2. The grounding switch using environmentally friendly gas as the insulating medium according to claim 1, characterized in that: The transmission mechanism assembly consists of a support bracket, a transmission shaft, a crank arm and a needle roller; The support bracket is fixed to the housing by bolts to support the transmission shaft. The output shaft of the operating mechanism is connected to the transmission shaft. The transmission shaft and the crank arm are engaged through splines. The crank arm is connected to the transmission plate through a needle roller. The transmission plate is assembled with the grounding switch through a transmission insulating plate.

3. The grounding switch using environmentally friendly gas as the insulating medium according to claim 2, characterized in that: The grounding switch assembly is composed of three grounding switch mechanisms, wherein the grounding switch mechanism includes a conductive rod, one end of which is fixedly connected to the transmission insulation plate; A support plate is provided on the housing, and a conductor seat for mounting the conductive rod is installed on one side of the support plate. The conductive rod passes through the conductor seat and the support plate and is assembled and connected with the moving-side arc contact.

4. The grounding switch using environmentally friendly gas as the insulating medium according to claim 3, characterized in that: A supporting pressure plate is provided on the other side of the supporting plate, and the supporting pressure plate is provided with a moving side shielding cover via two connecting rods.

5. The grounding switch using environmentally friendly gas as insulating medium according to claim 3, characterized in that: Guide rings are also installed between the conductor seat, the support plate and the conductive rod respectively; At least two circles of watchband contact fingers are arranged between the conductor seat and the conductive rod.

6. The grounding switch using environmentally friendly gas as insulating medium according to claim 3, characterized in that: The grounding assembly consists of a grounding insulator and a conductive bar. The grounding insulator is mounted on the housing through bolt connection, and the conductive bar is connected between the conductor base and the metal insert of the grounding insulator.

7. The grounding switch using environmentally friendly gas as the insulating medium according to claim 3, characterized in that: The moving side arc contact assembly includes a moving contact, which is arranged at the end of the conductive rod. The moving contact is made of copper and has a silver coating on the surface in contact with the static side arc contact assembly.

8. The grounding switch using environmentally friendly gas as the insulating medium according to claim 7, characterized in that: The static side arc contact assembly is composed of a supporting contact seat, a static side shielding cover, a guide ring, a static contact, a static arc contact finger and a limit contact seat; The support contact seat is hollow inside and is fixed to the busbar-side conductor by bolts. The guide ring limits the support contact seat to the end close to the moving contact through the static arc contact finger. The limiting contact seat is sleeved on the static arc contact finger, and a spring is provided between the static arc contact finger and the limiting contact seat. The static contact is open and threadedly connected to the limit contact seat. The static side shielding cover is a semi-enclosed structure and is installed on the support contact seat. The outer wall surface of the static side shielding cover and the outer wall surface of the static contact form an arc-shaped envelope surface.

9. The grounding switch using environmentally friendly gas as the insulating medium according to claim 8, characterized in that: The arc region on one side of the static arc contact finger facing away from the spring is tangent to the outer wall of the support contact seat.

10. The grounding switch using environmentally friendly gas as insulating medium according to claim 8, characterized in that: The inner wall of the top end of the static arc contact finger and the static contact are both provided with a copper-tungsten alloy ablation-resistant structure.

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