Ring main unit with tristable permanent magnet mechanism

Abstract

This utility model relates to a power equipment, and more particularly to a ring main unit with a tristable permanent magnet mechanism. It includes a cabinet, a pull rod disposed within the cabinet, a pull rod drive device, a moving contact, a stationary contact, a second grounding contact, and a vacuum interrupter. The second grounding contact and the stationary contact are both fixed within the vacuum interrupter. The stationary contact is located below the moving contact, and the second grounding contact is located above the moving contact. The lower end of the pull rod extends into the vacuum interrupter and passes through the second grounding contact. The moving contact is connected to the lower end of the pull rod. The pull rod drive device is connected to the pull rod and is used to drive the pull rod to move up and down, causing the moving contact to contact the stationary contact, disconnect from the stationary contact, and then contact the second grounding contact. This utility model achieves tristable operation and offers higher safety.

Description

Technical Field

[0001] This utility model relates to a power equipment, and more particularly to a ring main unit with a tristable permanent magnet mechanism. Background Technology

[0002] In power systems, high-voltage switchgear plays a crucial role, and its operating status directly affects the stability and security of the power system.

[0003] Existing high-voltage switchgear uses an operating mechanism to drive an insulating rod, enabling the vacuum circuit breaker to close or open. However, due to structural limitations, high-voltage switches can only achieve a bistable state, that is, they can only achieve the open and close states, and cannot achieve an automatic grounding state, thus compromising safety. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a ring main unit with a tristable permanent magnet mechanism that can achieve tristable state and has higher safety.

[0005] To address the aforementioned technical problems, this application provides the following technical solution:

[0006] This utility model discloses a ring main unit with a tristable permanent magnet mechanism, comprising a cabinet, a pull rod disposed within the cabinet, a pull rod driving device, a moving contact, a stationary contact, a second grounding contact, and a vacuum interrupter. The second grounding contact is annular. Both the second grounding contact and the stationary contact are fixed within the vacuum interrupter. The stationary contact is located below the moving contact, and the second grounding contact is located above the moving contact. The lower end of the pull rod extends into the vacuum interrupter and passes through the second grounding contact. The moving contact is connected to the lower end of the pull rod. The pull rod driving device is connected to the pull rod and is used to drive the pull rod to move up and down, causing the moving contact to contact the stationary contact, disconnect from the stationary contact, and contact the second grounding contact.

[0007] Furthermore, the pull rod drive device includes an adjuster, an armature, and a permanent magnet. The permanent magnet has a hollow cavity, the armature is disposed in the hollow cavity and its top extends out of the permanent magnet, the adjuster is connected to the armature, and the bottom of the armature is connected to the upper end of the pull rod. The adjuster is used to adjust the direction and magnitude of the current in the armature, so that the armature drives the pull rod to move up and down.

[0008] Furthermore, the pull rod drive device also includes an armature limiting assembly, which includes a limiting cylinder connected to the cabinet. The limiting cylinder is vertically arranged and sleeved outside the armature. The armature is adapted to move up and down relative to the limiting cylinder.

[0009] Furthermore, the armature limiting assembly also includes a horizontal shaft fixedly installed on the top of the cabinet, and the limiting cylinder is fixedly connected to the horizontal shaft.

[0010] Furthermore, a limiting plate is also provided on the top of the armature.

[0011] Furthermore, the permanent magnet includes a housing and a moving iron core, a coil, a stationary iron core, and a plurality of magnetic steel sheets disposed within the housing. The moving iron core, the coil, and the stationary iron core are arranged sequentially from top to bottom, and the magnetic steel sheets are connected to the outer wall of the stationary iron core.

[0012] Furthermore, the stationary contact includes a stationary contact seat, a compensating contact, and a compensating spring. The stationary contact seat is provided with a groove, and the compensating contact and the compensating spring are both disposed in the groove. The compensating contact is located above the compensating spring. One end of the compensating spring is connected to the bottom of the groove, and the other end is connected to the compensating contact. When the compensating spring is in its natural state, the top of the compensating contact is higher than the top of the stationary contact seat.

[0013] Furthermore, it also includes a grounding protection device installed inside the cabinet. The grounding protection device includes a grounding switch blade, a first grounding contact, and a grounding copper busbar. The grounding copper busbar is grounded, and the first grounding contact is connected to the grounding copper busbar. A busbar is installed inside the cabinet and is connected to the grounding switch blade. The grounding switch blade is adapted to connect or disconnect from the first grounding contact, and the second grounding contact is connected to the grounding switch blade.

[0014] Furthermore, the grounding protection device also includes a switch blade drive assembly, which includes a drive shaft, a crank arm, and a sliding sleeve. The drive shaft is connected to the inner wall of the cabinet. The crank arm is arc-shaped and has a support lug. One end of the crank arm is hinged to the support lug, and the other end is hinged to the sliding sleeve. The sliding sleeve is fitted onto the grounding switch blade. When the drive shaft is rotated, the drive shaft drives the grounding switch blade to rotate through the crank arm, causing the grounding switch blade to connect or disconnect from the first grounding contact.

[0015] Furthermore, the first grounding contact is L-shaped, and the end of the grounding switch blade that mates with the first grounding contact is a U-shaped connecting end. When the grounding switch blade is connected to the first grounding contact, the U-shaped connecting end is inserted into the first grounding contact.

[0016] Compared with the prior art, the ring main unit with the tristable permanent magnet mechanism of this utility model has at least the following beneficial effects:

[0017] This utility model discloses a ring main unit with a tristable permanent magnet mechanism. It includes a pull rod, a pull rod drive device, a moving contact, a stationary contact, and a second grounding contact. The pull rod drive device moves the pull rod up and down, causing the moving contact to contact the stationary contact, disconnect from the stationary contact, and contact the second grounding contact. Therefore, it can achieve three states: open, closed, and grounded, giving the switchgear tristable state. This also ensures that any remaining electric arc inside the ring main unit after opening is guided to the ground, improving the safety of the ring main unit.

[0018] The following description, in conjunction with the accompanying drawings, further illustrates the ring main unit of this utility model with a tristable permanent magnet mechanism. Attached Figure Description

[0019] Figure 1 This is a first front view schematic diagram of the overall structure of the ring main unit with a tristable permanent magnet mechanism of this utility model;

[0020] Figure 2 This is a second front view schematic diagram of the overall structure of the ring main unit with a tristable permanent magnet mechanism of this utility model;

[0021] Figure 3 This is a third front view schematic diagram of the overall structure of the ring main unit with a tristable permanent magnet mechanism of this utility model.

[0022] Figure 4 This is a fourth front view schematic diagram of the overall structure of the ring main unit with a tristable permanent magnet mechanism of this utility model;

[0023] Figure 5 This is a rear view schematic diagram of the overall structure of the ring main unit with a tristable permanent magnet mechanism according to this utility model;

[0024] Figure 6 yes Figure 1 A magnified view of a section at point A in the middle;

[0025] Figure 7 yes Figure 2 A magnified view of a section at point B in the middle;

[0026] Figure 8 yes Figure 2 A magnified view of a section at point C;

[0027] Figure 9 yes Figure 2 A magnified view of a section at point D;

[0028] Figure 10 yes Figure 3 A magnified view of a section at point E in the middle;

[0029] Figure 11 yes Figure 4 A magnified view of a section at point F in the middle;

[0030] Figure 12 This is a schematic diagram of the stationary contact in a ring main unit with a tristable permanent magnet mechanism according to this utility model. Detailed Implementation

[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 8 As shown, this utility model discloses a ring main unit with a tristable permanent magnet mechanism, including a cabinet 1, a pull rod 6 disposed within the cabinet 1, a pull rod drive device, a moving contact 17, a stationary contact 18, a second grounding contact 19, and a vacuum interrupter 16. The second grounding contact 19 is used for grounding. Both the second grounding contact 19 and the stationary contact 18 are fixed within the vacuum interrupter 16. The stationary contact 18 is located below the moving contact 17, and the second grounding contact 19 is located above the moving contact 17. The lower end of the pull rod 6 extends into the vacuum interrupter 16, and the moving contact 17 is connected to the lower end of the pull rod 6. The pull rod drive device is connected to the pull rod 6 and is used to drive the pull rod 6 to move up and down, so that the moving contact 17 contacts the stationary contact 18, disconnects from the stationary contact 18, and contacts the second grounding contact 19. The vacuum interrupter 16 can eliminate the electric arc generated during closing and opening, preventing the electric arc from affecting operational safety. Specifically, the second grounding contact 19 is annular, and the lower end of the pull rod 6 passes through the second grounding contact 19. A pull rod 6, a pull rod driving device, a moving contact 17, a stationary contact 18, the second grounding contact 19, and a vacuum interrupter 16 constitute a set of switching components. In this embodiment, three sets of switching components are provided. When in use, the ring main unit with a tristable permanent magnet mechanism of this utility model moves the pull rod 6 downwards via the pull rod driving device, causing the moving contact 17 to contact and tighten with the stationary contact 18, achieving the first stable state, i.e., closing; moves the pull rod 6 upwards via the pull rod driving device, causing the moving contact 17 to separate from the stationary contact 18, achieving the second stable state, i.e., opening; and increases the upward distance of the pull rod 6 driven by the pull rod driving device, causing the moving contact 17 to contact and tighten with the second grounding contact 19, achieving the third stable state, i.e., grounding. This utility model discloses a ring main unit with a tristable permanent magnet mechanism. It includes a pull rod 6, a pull rod drive device, a moving contact 17, a stationary contact 18, and a second grounding contact 19. The pull rod drive device drives the pull rod 6 to move up and down, causing the moving contact 17 to contact the stationary contact 18, disconnect from the stationary contact 18, and contact the moving contact 17 with the second grounding contact 19. Therefore, it can achieve three states: open, closed, and grounded, giving the switchgear a tristable state. This also ensures that any remaining electric arc inside the ring main unit after opening is guided to the ground, improving the safety of the ring main unit.

[0032] Optionally, such as Figure 5 , Figure 7 , Figure 8As shown, the pull rod drive device includes an adjuster 21, an armature 4, and a permanent magnet 5. The permanent magnet 5 has a hollow cavity. The armature 4 is disposed within the hollow cavity, with its top extending beyond the permanent magnet 5. The top of the armature 4 is connected to the adjuster 21, and its bottom is connected to the upper end of the pull rod 6. The adjuster 21 is used to adjust the direction and magnitude of the current within the armature 4, causing the armature 4 to drive the pull rod 6 to move up and down. Specifically, it also includes two mounting plates 2, both connected to the top plate of the cabinet 1, forming an installation space between them. The permanent magnet 5 is disposed within this installation space. In operation, the direction of the current is adjusted by the regulator 21. Under the action of the permanent magnet 5, the armature 4 is subjected to a downward force, which drives the pull rod 6 to move downward, so that the moving contact 17 and the stationary contact 18 are in contact and tightly closed, realizing the first steady state, i.e., closing. The direction of the current is adjusted by the regulator 21 so that the current direction of the armature 4 is reversed. The armature 4 is subjected to an upward force from the permanent magnet 5, which drives the pull rod 6 to move upward, so that the moving contact 17 and the stationary contact 18 are separated, realizing the second steady state, i.e., opening. When the current flow direction is made consistent with the second steady state by the regulator 21 and the current intensity is increased, the armature 4 is subjected to a greater upward force from the permanent magnet 5, so that the armature 4 drives the pull rod 6 to move upward a greater distance, and the moving contact 17 is in contact and tightly closed with the second grounding contact 19, realizing the third steady state, i.e., grounding. The armature 4 is moved up and down by the permanent magnet 5, which in turn drives the pull rod 6 to move up and down. There is no need for mechanical opening and closing, which can ensure the accuracy of opening and closing, and also improve the safety and reliability of the opening and closing process. By changing the direction and intensity of the current, the armature 4 can be precisely controlled, which improves the stability and safety of the high-voltage switchgear. In addition, the structure is simple, the operation is easy, and the maintenance is easy.

[0033] Optionally, such as Figure 11 As shown, the permanent magnet 5 includes a housing and a moving iron core 51, a coil 52, a stationary iron core 53, and multiple magnetic steel plates 54 disposed within the housing. The moving iron core 51, coil 52, and stationary iron core 53 are arranged sequentially from top to bottom, and the magnetic steel plates 54 are connected to the outer wall of the stationary iron core 53. Specifically, the coil 52 and the stationary iron core 53 are both fixed to the inner wall of the housing. The moving iron core 51, coil 52, and stationary iron core 53 are all annular, which can improve the stability and reliability of the permanent magnet 5. The magnetic steel plates 54 are arc-shaped sheets, and multiple magnetic steel plates 54 are evenly spaced and attached to the outer circumferential surface of the stationary iron core 53, thereby enhancing the magnetism of the permanent magnet 5.

[0034] Optionally, such as Figure 12As shown, the stationary contact 18 includes a stationary contact seat 180, a compensating contact 182, and a compensating spring 183. A groove 181 is provided on the stationary contact seat 180. The compensating contact 182 and the compensating spring 183 are both disposed within the groove 181. The compensating contact 182 is located above the compensating spring 183. One end of the compensating spring 183 is connected to the bottom of the groove 181, and the other end is connected to the compensating contact 182. When the compensating spring 183 is in its natural state, the top of the compensating contact 182 is higher than the top of the stationary contact seat 180. When the moving contact 17 contacts the stationary contact 18, it first contacts the compensating contact 182, causing the compensating spring 183 to be compressed. The compensating contact 182 moves downward relative to the groove 181. When the top of the compensating contact 182 is flush with the stationary contact seat 180, the moving contact 17 and the stationary contact 18 are fully engaged, completing the closing operation. By using the compensating contact 182 and the compensating spring 183, gaps between the moving contact 17 and the stationary contact 18 are avoided, making the closing more stable. At the same time, it can compensate for the deformation of the moving contact 17 and the stationary contact 18 due to long-term contact, as well as the gaps caused by high-pressure oxidation of the contact surfaces of the moving contact 17 and the stationary contact 18, thereby improving the service life of the ring main unit.

[0035] Optionally, such as Figure 7 , Figure 11 As shown, the lever drive device also includes an armature limiting assembly 3, which includes a limiting cylinder 32. The limiting cylinder 32 is connected to the cabinet 1 and is vertically arranged. The limiting cylinder 32 is fitted over the armature 4, and the armature 4 is adapted to move up and down relative to the limiting cylinder 32. The limiting cylinder 32 limits the movement of the armature 4 and prevents it from deviating from the vertical direction when moving up and down.

[0036] Optionally, the armature limiting assembly 3 further includes a horizontal shaft 31 fixedly mounted on the top of the cabinet 1, and a limiting cylinder 32 fixedly connected to the horizontal shaft 31. In this embodiment, the three limiting cylinders 32 are arranged sequentially along the length of the horizontal shaft 31. A limiting piece 41 is also provided on the top of the armature 4 to limit the up and down movement of the armature 4 relative to the limiting cylinder 32.

[0037] Optionally, such as Figure 4 , Figure 5 , Figure 9 , Figure 10As shown, the device also includes a grounding protection device installed inside the cabinet 1. The grounding protection device includes a grounding switch blade 9, a first grounding contact 10, and a grounding copper busbar 11. The grounding copper busbar 11 is grounded, and the first grounding contact 10 is connected to the grounding copper busbar 11. A busbar is installed inside the cabinet 1, and the busbar is connected to the grounding switch blade 9. The grounding switch blade 9 is adapted to connect or disconnect from the first grounding contact 10. A second grounding contact 19 is connected to the grounding switch blade 9 via a conductor 20. In this embodiment, the grounding protection device is provided in three sets. The three first grounding contacts 10 are arranged sequentially along the length of the grounding copper busbar 11. The busbar includes an A-phase busbar 12, a B-phase busbar 13, and a C-phase busbar 14. Each of the A-phase busbar 12, B-phase busbar 13, and C-phase busbar 14 is connected to a grounding switch blade 9. Since the second grounding contact 19 is electrically connected to the grounding switch blade 9, when the grounding switch blade 9 is connected to the first grounding contact 10, the second grounding contact 19 can be grounded through the first grounding contact 10, guiding the remaining electric arc inside the ring main unit after the switch is opened to the ground, thus improving the safety of the ring main unit. At the same time, by connecting or disconnecting the grounding switch blade 9 from the first grounding contact 10, when the ring main unit is not in use or during transportation, the grounding switch blade 9 is separated from the first grounding contact 10, preventing damage to the grounding switch blade 9 or the first grounding contact 10 due to vibration. When the ring main unit is in use, the grounding switch blade 9 is reconnected to the first grounding contact 10 to ensure good contact between the grounding switch blade 9 and the first grounding contact 10, and to improve the service life of the ring main unit.

[0038] Optionally, the grounding protection device further includes a switch blade drive assembly, which includes a drive shaft 7, a crank arm 8, and a sliding sleeve 81. The drive shaft 7 is connected to the inner wall of the cabinet 1. The crank arm 8 is arc-shaped, and a support lug 71 is provided on the drive shaft 7. One end of the crank arm 8 is hinged to the support lug 71, and the other end is hinged to the sliding sleeve 81. The sliding sleeve 81 is fitted onto the grounding switch blade 9. Rotating the drive shaft 7 causes the grounding switch blade 9 to rotate through the crank arm 8, thereby connecting or disconnecting the grounding switch blade 9 from the first grounding contact 10. Specifically, the drive shaft 7 is a square shaft, and the drive shaft 7 is rotatably connected to the inner wall of the cabinet 1.

[0039] Optionally, the first grounding contact 10 is L-shaped, and the end of the grounding switch blade 9 that mates with the first grounding contact 10 is a U-shaped connection end. When the grounding switch blade 9 is connected to the first grounding contact 10, the U-shaped connection end is inserted into the first grounding contact 10, making the grounding switch blade 9 and the first grounding contact 10 fit more tightly, improving the fit effect and improving the stability of the switch.

[0040] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A ring main unit with a tri-stable permanent magnet mechanism, characterized in that, The system includes a cabinet (1), a pull rod (6) installed within the cabinet (1), a pull rod drive device, a moving contact (17), a stationary contact (18), a second grounding contact (19), and a vacuum interrupter (16). The second grounding contact (19) is annular. Both the second grounding contact (19) and the stationary contact (18) are fixed within the vacuum interrupter (16). The stationary contact (18) is located below the moving contact (17), and the second grounding contact (19) is located above the moving contact (17). The lower end of the pull rod (6) extends into the vacuum interrupter (16) and passes through the second grounding contact (19). The moving contact (17) is connected to the lower end of the pull rod (6). The pull rod driving device is connected to the pull rod (6). The pull rod driving device is used to drive the pull rod (6) to move up and down, so that the moving contact (17) contacts the stationary contact (18), the moving contact (17) disconnects from the stationary contact (18), and the moving contact (17) contacts the second grounding contact (19).

2. The ring main unit with a tri-stable permanent magnetic mechanism according to claim 1, characterized in that, The lever drive device includes an adjuster (21), an armature (4), and a permanent magnet (5). The permanent magnet (5) has a hollow cavity. The armature (4) is located inside the hollow cavity and its top extends out of the permanent magnet (5). The adjuster (21) is connected to the armature (4). The bottom of the armature (4) is connected to the upper end of the lever (6). The adjuster (21) is used to adjust the direction and magnitude of the current in the armature (4) so ​​that the armature (4) drives the lever (6) to move up and down.

3. The ring main unit with a tristable permanent magnet mechanism according to claim 2, characterized in that, The pull rod drive device also includes an armature limiting assembly (3), which includes a limiting cylinder (32). The limiting cylinder (32) is connected to the cabinet (1). The limiting cylinder (32) is vertically arranged and is sleeved on the armature (4). The armature (4) is adapted to move up and down relative to the limiting cylinder (32).

4. The ring main unit with a tristable permanent magnet mechanism according to claim 3, characterized in that, The armature limiting assembly (3) also includes a horizontal shaft (31) fixedly installed on the top of the cabinet (1), and the limiting cylinder (32) is fixedly connected to the horizontal shaft (31).

5. The ring main unit with a tristable permanent magnet mechanism according to claim 4, characterized in that, A limiting piece (41) is also provided on the top of the armature (4).

6. The ring main unit with a tristable permanent magnet mechanism according to claim 5, characterized in that, The permanent magnet (5) includes a housing and a moving iron core (51), a coil (52), a stationary iron core (53), and a plurality of magnetic steel sheets (54) disposed in the housing. The moving iron core (51), the coil (52), and the stationary iron core (53) are arranged sequentially from top to bottom, and the magnetic steel sheets (54) are connected to the outer wall of the stationary iron core (53).

7. The ring main unit with a tristable permanent magnet mechanism according to any one of claims 1-6, characterized in that, The stationary contact (18) includes a stationary contact seat (180), a compensating contact (182), and a compensating spring (183). The stationary contact seat (180) is provided with a groove (181). The compensating contact (182) and the compensating spring (183) are both disposed in the groove (181). The compensating contact (182) is located above the compensating spring (183). One end of the compensating spring (183) is connected to the bottom of the groove (181), and the other end is connected to the compensating contact (182). When the compensating spring (183) is in its natural state, the top of the compensating contact (182) is higher than the top of the stationary contact seat (180).

8. The ring main unit with a tristable permanent magnet mechanism according to claim 7, characterized in that, It also includes a grounding protection device installed inside the cabinet (1). The grounding protection device includes a grounding switch blade (9), a first grounding contact (10), and a grounding copper busbar (11). The grounding copper busbar (11) is grounded. The first grounding contact (10) is connected to the grounding copper busbar (11). A busbar is installed inside the cabinet (1). The busbar is connected to the grounding switch blade (9). The grounding switch blade (9) is adapted to be connected or disconnected from the first grounding contact (10). The second grounding contact (19) is connected to the grounding switch blade (9).

9. The ring main unit with a tristable permanent magnet mechanism according to claim 8, characterized in that, The grounding protection device also includes a switch blade drive assembly, which includes a drive shaft (7), a crank arm (8), and a sliding sleeve (81). The drive shaft (7) is connected to the inner wall of the cabinet (1). The crank arm (8) is arc-shaped. The drive shaft (7) is provided with a lug (71). One end of the crank arm (8) is hinged to the lug (71), and the other end is hinged to the sliding sleeve (81). The sliding sleeve (81) is fitted on the grounding switch blade (9). When the drive shaft (7) is rotated, the drive shaft (7) drives the grounding switch blade (9) to rotate through the crank arm (8), so that the grounding switch blade (9) is connected or disconnected from the first grounding contact (10).

10. The ring main unit with a tristable permanent magnet mechanism according to claim 9, characterized in that, The first grounding contact (10) is L-shaped, and the end of the grounding switch blade (9) that cooperates with the first grounding contact (10) is a U-shaped connection end. When the grounding switch blade (9) is connected to the first grounding contact (10), the U-shaped connection end is inserted into the first grounding contact (10).

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