A switching disconnector for switchgear

Abstract

This utility model discloses a switching disconnector for switchgear. The key technical features are: it includes a switchgear enclosure, inside which two voltage transformer bodies are fixedly installed. Inside the enclosure are two copper busbars connected to the main circuit of each voltage transformer body. A high-voltage moving contact is fixedly installed on the bottom surface of each copper busbar, and a contact blade is provided on the bottom surface of each voltage transformer body. Through the coordinated operation of a driver, a rotating support shaft, an arc-shaped crank arm, an insulating pull rod, an inner conical sleeve, an isolating stationary contact, the contact blade, the copper busbar, and the high-voltage moving contact, opening and closing operations can be completed. After opening, the contact blade is disconnected from the high-voltage circuit, and the isolating stationary contact and inner conical sleeve are no longer electrified. At this point, disassembling the voltage transformer body and replacing the fuse will not cause personal injury, but the line remains operational and will not interrupt power supply to the locomotive.

Description

Technical Field

[0001] This utility model relates to the technical field of high-voltage AC metal-enclosed switchgear, specifically to a switching isolating switch for switchgear. Background Technology

[0002] Voltage transformers in 27.5kV high-voltage AC metal-enclosed switchgear for railways are important measurement and protection devices in power systems. They are mainly used to proportionally convert high voltage to low voltage for measurement, monitoring, and protection. If a voltage transformer malfunctions and goes out of service, the system will lose monitoring and protection, potentially leading to a larger accident. According to power system practice, high-voltage fuses are usually installed at the front end of the voltage transformer for protection. High-voltage fuses are single-use products; once they blow, they must be replaced, otherwise the voltage transformer must be taken out of service. Since replacing high-voltage components requires disconnecting the high-voltage power supply, personal injury can easily occur, especially with gas-insulated metal-enclosed switchgear. A power outage means the entire line will stop operating, and locomotives will be affected. Gas-insulated metal-enclosed switchgear is not easy to operate due to the sealed space. Designing a voltage transformer with a simple structure and small size that can be operated externally to switch disconnecting switches is of practical significance. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a switching disconnect switch for switching equipment.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0005] A switching disconnector for switchgear includes a switchgear enclosure. Two voltage transformer bodies are fixedly installed inside the enclosure. Two copper busbars connected to the main circuits of the voltage transformer bodies are disposed inside the enclosure. High-voltage moving contacts are fixedly installed on the bottom surface of the copper busbars. Contact blades are disposed on the bottom surface of the voltage transformer bodies, and the contact blades are movably engaged with the high-voltage moving contacts. Two inner conical sleeves are disposed inside the enclosure. Isolating stationary contacts are fixedly fitted onto the top of each inner conical sleeve, and the contact blades are movably connected to the isolating stationary contacts. The internal conductors of the inner conical sleeves are connected to a connector with a fuse in the voltage transformer body. An opening / closing assembly is disposed inside the switchgear enclosure. A rotary sealing assembly is disposed on one side of the switchgear enclosure.

[0006] To allow the contact blade to contact or separate from the high-voltage moving contact for closing and opening operations, as a preferred embodiment of the present invention for a switching disconnector, the opening and closing assembly includes: two operating brackets, both of which are fixedly installed inside one side of the switchgear housing; an arc-shaped crank arm is provided inside the operating bracket; a rotating support shaft is fixedly installed inside the operating bracket; the rotating support shaft is movably connected to the arc-shaped crank arm; insulating pull rods are provided on both sides of the contact blade; the contact blade is movably connected to the insulating pull rods; and the arc-shaped crank arm is located between the two insulating pull rods, with the insulating pull rods movably connected to the arc-shaped crank arm.

[0007] To limit the movement of the driver and prevent it from moving out of the operating bracket, as a switching disconnector for a switching device according to this utility model, preferably, the operating bracket contains a driver, and a guide block is fixedly installed inside the operating bracket. The driver is movably sleeved with the guide block. One end of the driver has a groove, and the outer circular wall of the driver has a waist-shaped guide groove that communicates with the groove. Pins are fixedly installed on both sides of the arc-shaped crank arm, and the arc-shaped crank arm is movably sleeved with the groove. The waist-shaped guide groove is movably sleeved with the pins. Arc-shaped guide grooves are slidably connected to the pins on both sides of the operating bracket.

[0008] In order to enable the driver to move back and forth stably, as a switching disconnect switch for switching equipment of this utility model, preferably, the other end of the driver is provided with a threaded groove, and two threaded posts are provided on one side of the switch equipment housing. The threaded posts pass through one side of the switch equipment housing and are threadedly connected to the threaded groove.

[0009] To ensure stable rotation of the rotating shaft and threaded column while maintaining gas sealing, the rotary sealing assembly, as a preferred embodiment of this utility model for a switching and isolating switch, comprises: two sealing discs, both of which are fixedly installed on one side of the switchgear housing; two rolling bearings are fixedly sleeved on the inner circular wall of the sealing discs; a rotating shaft is fixedly sleeved on the inner circular wall of the inner rings of the two rolling bearings; an operating handle is fixedly installed at one end of the rotating shaft away from the switchgear housing; the other end of the rotating shaft is fixedly installed to the threaded column; two lip seals are provided between the two rolling bearings; the lip seals are fixedly installed to the sealing discs and movably sleeved to the rotating shaft; shoulder retaining rings are fixedly sleeved at both ends of the sealing discs; and O-rings are fixedly sleeved on the outside of the sealing discs.

[0010] In order to block the arc-shaped crank arm, as a switching device of this utility model, preferably, two blocking columns are fixedly installed inside the operating bracket.

[0011] In summary, the present invention has the following main advantages:

[0012] 1. This device features a simple structure, small size, external rotation operation, and low operating force. Since the voltage transformer body has a very small current, the disconnecting switch can be directly switched on and off. Its conductor cross-sectional area hardly needs to be calculated, as long as it meets the mechanical performance requirements. Its contact pressure does not need to be high, as long as reliable contact is ensured. This can minimize the cost.

[0013] 2. The opening and closing operations can be completed by the coordinated use of the driver, rotating support shaft, arc-shaped crank arm, insulating tie rod, inner cone sleeve, isolating stationary contact, contact blade, copper busbar and high-voltage moving contact. After the opening operation, the contact blade is disconnected from the high-voltage circuit, and the isolating stationary contact and inner cone sleeve are no longer electrified. At this time, the voltage transformer body can be disassembled and the fuse replaced without causing personal injury. However, the line is still in operation and will not interrupt the power supply to the locomotive. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the switchgear enclosure structure of this utility model;

[0016] Figure 3 yes Figure 2 Schematic diagram of the structural section at point AA;

[0017] Figure 4 This is a schematic diagram of the operating support structure of this utility model;

[0018] Figure 5 This is a schematic diagram of the insulating tie rod structure of this utility model;

[0019] Figure 6 This is a schematic cross-sectional view of the closed position of a switching disconnector for a switching device.

[0020] Figure 7 This is a schematic cross-sectional view of the switching and disconnecting switch for a switching device.

[0021] Figure 8 This is a schematic diagram of the rotating support shaft structure of this utility model;

[0022] Figure 9 This is a schematic diagram of the driver structure of this utility model;

[0023] Figure 10 This is a schematic diagram of the sealing disc structure of this utility model;

[0024] Figure 11 yes Figure 10 Schematic diagram of the cross-section of the structure at point BB.

[0025] Reference numerals in the attached drawings: 1. Switchgear enclosure; 2. Voltage transformer body; 3. Contact blade; 4. Isolating stationary contact; 5. Rotary support shaft; 6. Inner tapered sleeve; 7. Insulating tie rod; 8. Arc-shaped crank arm; 9. Operating bracket; 10. Blocking post; 11. Driver; 12. Guide block; 13. Sealing disc; 14. Operating handle; 15. Threaded post; 16. Arc-shaped guide groove; 17. Waist-shaped guide groove; 18. Groove; 19. Pin; 20. O-ring seal; 21. Rolling bearing; 22. Lip seal; 23. Rotating shaft; 24. Shoulder retaining ring; 25. High-voltage moving contact; 26. Copper busbar. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example: Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 A switching disconnector for switchgear includes a switchgear enclosure 1. Two voltage transformer bodies 2 are fixedly installed inside the switchgear enclosure 1. Two copper busbars 26 connected to the main circuit of the voltage transformer bodies 2 are provided inside the switchgear enclosure 1. A high-voltage moving contact 25 is fixedly installed on the bottom surface of the copper busbars 26. A contact blade 3 is provided on the bottom surface of the voltage transformer body 2. The contact blade 3 is movably engaged with the high-voltage moving contact 25. Two inner conical sleeves 6 are provided inside the switchgear enclosure 1. An isolating stationary contact 4 is fixedly sleeved on the top of the inner conical sleeve 6. The contact blade 3 is movably connected to the isolating stationary contact 4. The internal conductor of the inner conical sleeve 6 is connected to the connector with a fuse of the voltage transformer body 2. An opening and closing assembly is provided inside the switchgear enclosure 1.

[0028] refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8The opening and closing assembly includes two operating brackets 9, both of which are fixedly installed inside one side of the switchgear housing 1. An arc-shaped crank arm 8 is provided inside the operating bracket 9, and a rotating support shaft 5 is fixedly installed inside the operating bracket 9. The rotating support shaft 5 is movably connected to the arc-shaped crank arm 8. Insulating pull rods 7 are provided on both sides of the contact blade 3, and the contact blade 3 is movably connected to the insulating pull rods 7. The arc-shaped crank arm 8 is located between the two insulating pull rods 7, and the insulating pull rods 7 are movably connected to the arc-shaped crank arm 8.

[0029] The circuit consists of a four-bar linkage formed by the contact blade 3, insulating pull rod 7, arc-shaped crank arm 8, and driver 11. The arc-shaped crank arm 8 can rotate around the rotating support shaft 5. The isolating stationary contact 4 of the disconnecting switch is fixed at the upper end of the inner conical sleeve 6. The inner conical sleeve 6 is sealed and fixed at the bottom of the switchgear housing 1. Similar to the cable connection, the connector of the voltage transformer body 2 is connected to the conductor inside the inner conical sleeve 6 through a sealed connection. The high-voltage fuse is installed inside the connector of the voltage transformer. After installation, the voltage transformer is in an insulated and sealed state.

[0030] When closing is required, the contact blade 3 is rotated by the arc-shaped crank arm 8, which pushes the contact blade 3 to move. This allows the bottom of the contact blade 3 to rotate around the isolating stationary contact 4. The contact blade 3 then gradually becomes upright, and the top of the contact blade 3 approaches the bottom of the copper busbar 26 and contacts the high-voltage moving contact 25, thus completing the closing operation and connecting the inner cone sleeve 6 to the high-voltage electricity.

[0031] refer to Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 The operating bracket 9 is equipped with a driver 11 and a guide block 12 is fixedly installed inside the operating bracket 9. The driver 11 is movably connected to the guide block 12. One end of the driver 11 is provided with a groove 18. The outer circular wall of the driver 11 is provided with a waist-shaped guide groove 17, which is connected to the groove 18. The two sides of the arc-shaped crank arm 8 are respectively fixedly installed with pins 19. The arc-shaped crank arm 8 is movably connected to the groove 18. The waist-shaped guide groove 17 is movably connected to the pins 19. The two sides of the operating bracket 9 are respectively provided with arc-shaped guide grooves 16, which are slidably connected to the pins 19.

[0032] Among them, the arc-shaped crank arm 8 is fitted in the groove 18, and the movement in the lateral direction is restricted. When the driver 11 makes a linear movement in the front and back direction, the pin 19 can move up and down along the waist-shaped guide groove 17, and can also move along the arc surface of the arc-shaped guide groove 16.

[0033] When performing a closing operation, the driver 11 is pushed, causing it to move towards the inner wall of the switchgear housing 1. This pulls the pin 19, which slides along the inside of the arc-shaped guide groove 16. The pin 19 then pulls the top of the arc-shaped crank arm 8 towards the inner wall of the switchgear housing 1. Through leverage, the arc-shaped crank arm 8 rotates around the rotating support shaft 5. Subsequently, the bottom of the arc-shaped crank arm 8 tilts upwards, pushing the insulating rod 7. The insulating rod 7, pushed by the arc-shaped crank arm 8, then pushes the contact knife 3, moving it to an upright position. At this point, the bottom of the contact knife 3 rotates around the isolating stationary contact 4, and the top of the contact knife 3 gradually approaches the high-voltage moving contact 25, allowing the contact knife 3 to contact the high-voltage moving contact 25 for closing, thus completing the operation. When energized, conversely, by pushing the driver 11 towards the inside of the switchgear housing 1, the driver 11 pushes the pin 19 to move the top of the arc-shaped crank arm 8. After the top of the arc-shaped crank arm 8 is pushed and squeezed, the arc-shaped crank arm 8 will rotate and reset around the rotating support shaft 5. Then, the bottom of the arc-shaped crank arm 8 gradually approaches the inner bottom surface of the switchgear housing 1. At the same time, the bottom of the arc-shaped crank arm 8 will pull the insulating rod 7 to move the contact knife 3, which can tilt the contact knife 3, making it easier for the contact knife 3 to move away from the copper busbar 26 and separate from the high-voltage moving contact 25, thereby completing the tripping operation. After the tripping operation, the contact knife 3 is separated from the high-voltage circuit, and the isolating stationary contact 4 and the inner cone sleeve 6 are no longer electrified. At this time, disassembling the voltage transformer body 2 and replacing the fuse will not cause personal injury, but the line is still in operation and will not interrupt the power supply to the locomotive.

[0034] refer to Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11The other end of the driver 11 has a threaded groove. Two threaded posts 15 are provided on one side of the switchgear housing 1. The threaded posts 15 pass through one side of the switchgear housing 1 and are threadedly connected to the threaded groove. A rotary sealing assembly is provided on one side of the switchgear housing 1. The rotary sealing assembly includes two sealing discs 13. Both sealing discs 13 are fixedly installed on one side of the switchgear housing 1. Two rolling bearings 21 are fixedly sleeved on the inner circular wall of the sealing discs 13. Rotating shafts 23 are fixedly sleeved on the inner circular wall of the inner rings of the two rolling bearings 21. An operating handle 14 is fixedly installed at one end of the rotating shaft 23 away from the switchgear housing 1, and the other end of the rotating shaft 23 is fixedly installed with a threaded post 15. Two lip seals 22 are provided between the two rolling bearings 21. The lip seals 22 are fixedly installed with the sealing disc 13 and are movably connected with the rotating shaft 23. Shoulder retaining rings 24 are fixedly fitted at both ends of the sealing disc 13. O-rings 20 are fixedly fitted on the outside of the sealing disc 13. Two blocking posts 10 are fixedly installed inside the operating bracket 9.

[0035] The operating handle 14 acts on the outside of the sealing disc 13. When rotating, it drives the threaded column 15 to rotate. The screwing in or out of the threaded column 15 drives the driver 11 to make linear motion. When the driver 11 moves toward the inner wall of the switchgear housing 1, it pulls the arc-shaped crank arm 8. Due to the support of the rotating support shaft 5, the other end of the arc-shaped crank arm 8 pushes the insulating pull rod assembly 7 to move. Due to the lever effect, the other end of the insulating pull rod 7 pushes the contact knife 3 toward the high-voltage moving contact 25 until it is completely closed to achieve the closing.

[0036] The rotating shaft 23 is kept axially stable by two rolling bearings 21 inside the sealing disc 13. The lip seals 22 on both sides seal the rotating shaft 23 during movement. The shoulder retaining rings 24 at both ends of the rolling bearings 21 limit their position and keep the seal stable. The two sides of the rotating shaft 23 are connected to the operating handle 14 and the threaded post 15 respectively, so as to realize the transmission of movement and ensure the gas sealing.

[0037] Working principle: Please refer to Figures 1-11As shown, when performing a closing operation, the driver 11 rotates the operating handle 14, causing the rotating shaft 23 and the threaded column 15 to rotate counterclockwise. This causes the driver 11 to move linearly along the threaded column 15 and gradually approach the inner wall of the switchgear housing 1. The driver 11 then moves towards the inner wall of the switchgear housing 1, pulling the pin 19. At this time, the pin 19 slides along the inside of the arc-shaped guide groove 16, thus pulling the top of the arc-shaped crank arm 8 towards the inner wall of the switchgear housing 1. The device moves along the wall direction, and then, through the lever principle, the arc-shaped crank arm 8 rotates around the rotating support shaft 5. Subsequently, the bottom end of the arc-shaped crank arm 8 tilts upward and pushes the insulating rod 7 to move. Then, the insulating rod 7, pushed by the arc-shaped crank arm 8, pushes the contact knife 3 to move, which can then push the tilted contact knife 3 to an upright position. At this time, the bottom of the contact knife 3 will rotate around the isolating stationary contact 4, and the top of the contact knife 3 will gradually approach the high-voltage moving contact 25, so that the contact knife 3 can make contact with the high-voltage moving contact 25 to close the circuit and complete the energization. Conversely, by rotating the operating handle 14, the rotating shaft 23 and the threaded column 15 rotate clockwise. This causes the driver 11 to move linearly along the threaded column 15 and gradually approach the interior of the switchgear housing 1. This allows the driver 11 to move inwards towards the interior of the switchgear housing 1. The driver 11 then pushes the pin 19, causing the top end of the arc-shaped crank arm 8 to move. After being pushed and compressed, the top end of the arc-shaped crank arm 8 rotates and resets around the rotating support shaft 5. Then, the bottom end of the arc-shaped crank arm 8 gradually approaches the switchgear housing. On the inner bottom surface of the spare box housing 1, the bottom of the arc-shaped crank arm 8 will pull the insulating rod 7 to move the contact knife 3, thereby tilting the contact knife 3 so that it can be separated from the copper busbar 26 and the high-voltage moving contact 25, thus completing the tripping operation. After the tripping operation, the contact knife 3 is separated from the high-voltage circuit, and the isolating stationary contact 4 and the inner cone sleeve 6 are no longer electrified. At this time, the voltage transformer body 2 can be disassembled and the fuse replaced without causing personal injury, but the line is still in operation and will not interrupt the power supply to the locomotive.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A switching disconnector for a switching device, characterized in that, include: A switchgear enclosure (1) is provided. Two voltage transformer bodies (2) are fixedly installed inside the switchgear enclosure (1). Two copper busbars (26) connected to the main circuit of the voltage transformer bodies (2) are provided inside the switchgear enclosure (1). A high-voltage moving contact (25) is fixedly installed on the bottom surface of the copper busbars (26). A contact blade (3) is provided on the bottom surface of the voltage transformer body (2). The contact blade (3) is movably engaged with the high-voltage moving contact (25). Two inner conical sleeves (6) are provided inside the switchgear enclosure (1). An isolation stationary contact (4) is fixedly sleeved on the top of the inner conical sleeve (6). The contact blade (3) is movably connected to the isolation stationary contact (4). The internal conductor of the inner conical sleeve (6) is connected to the connector with a fuse of the voltage transformer body (2). The opening and closing assembly is disposed inside the switchgear housing (1); A rotary sealing assembly is disposed on one side of the switchgear enclosure (1).

2. The switching disconnector for a switching device according to claim 1, characterized in that, The opening and closing component includes: Two operating brackets (9) are fixedly installed inside one side of the switchgear housing (1). An arc-shaped crank arm (8) is provided inside the operating bracket (9). A rotating support shaft (5) is fixedly installed inside the operating bracket (9). The rotating support shaft (5) is movably connected to the arc-shaped crank arm (8). Insulating pull rods (7) are provided on both sides of the contact knife (3). The contact knife (3) is movably connected to the insulating pull rods (7). The arc-shaped crank arm (8) is located between the two insulating pull rods (7). The insulating pull rods (7) are movably connected to the arc-shaped crank arm (8).

3. A switching disconnector for a switching device according to claim 2, characterized in that: The operating bracket (9) is equipped with a driver (11) inside. A guide block (12) is fixedly installed inside the operating bracket (9). The driver (11) is movably connected to the guide block (12). A groove (18) is opened at one end of the driver (11). A waist-shaped guide groove (17) is opened on the outer circular wall of the driver (11). The waist-shaped guide groove (17) is connected to the groove (18). Pins (19) are fixedly installed on both sides of the arc-shaped crank arm (8). The arc-shaped crank arm (8) is movably connected to the groove (18). The waist-shaped guide groove (17) is movably connected to the pin (19). Arc-shaped guide grooves (16) are opened on both sides of the operating bracket (9). The arc-shaped guide grooves (16) are slidably connected to the pins (19).

4. A switching disconnector for a switching device according to claim 3, characterized in that: The other end of the driver (11) is provided with a threaded groove, and two threaded posts (15) are provided on one side of the switchgear housing (1). The threaded posts (15) pass through one side of the switchgear housing (1) and are threadedly connected to the threaded groove.

5. A switching disconnector for a switching device according to claim 4, characterized in that: The rotary sealing assembly includes: Two sealing discs (13) are fixedly installed on one side of the switchgear housing (1). Two rolling bearings (21) are fixedly sleeved on the inner circular wall of the sealing disc (13). A rotating shaft (23) is fixedly sleeved on the inner circular wall of the inner ring of the two rolling bearings (21). An operating handle (14) is fixedly installed at one end of the rotating shaft (23) away from the switchgear housing (1). The other end of the rotating shaft (23) is fixedly installed with the threaded column (15). Two lip seals (22) are provided between the two rolling bearings (21). The lip seals (22) are fixedly installed with the sealing disc (13). The lip seals (22) are movably sleeved with the rotating shaft (23). Shoulder retaining rings (24) are fixedly sleeved at both ends of the sealing disc (13). An O-ring seal (20) is fixedly sleeved on the outside of the sealing disc (13).

6. A switching disconnector for a switching device according to claim 2, characterized in that: The operating bracket (9) has two blocking posts (10) fixedly installed inside.

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