Ring main unit with three-stable permanent magnetic mechanism

Abstract

The invention relates to power equipment, in particular to a ring main unit with a three-stable permanent magnetic mechanism, which comprises a cabinet body, a pull rod arranged in the cabinet body, a pull rod driving device, a moving contact, a static contact, a second grounding contact and a vacuum arc-extinguishing chamber, and is characterized in that the second grounding contact and the static contact are both fixed in the vacuum arc-extinguishing chamber; the static contact is located below the moving contact, the second grounding contact is located above the moving contact, the lower end of the pull rod extends into the vacuum arc-extinguishing chamber, the moving contact is connected to the lower end part of the pull rod, the pull rod driving device is connected with the pull rod, and the pull rod driving device is used for driving the pull rod to move up and down. And the moving contact is in contact with the static contact, the moving contact is disconnected from the static contact, and the moving contact is in contact with the second grounding contact. According to the invention, three stable states can be realized, and the safety is higher.

Description

Technical Field

[0001] The invention relates to electric power equipment, in particular to a ring network cabinet with a tri-stable permanent magnet mechanism. Background Art

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

[0003] Existing high-voltage switchgear uses an operating mechanism to drive the insulating pull rod to close or open the vacuum circuit breaker. However, due to structural limitations, the high-voltage switch can only achieve a bistable state, that is, it can only achieve the open and closed states, and cannot achieve an automatic grounding state, and safety cannot be guaranteed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a ring main unit with a tristable permanent magnet mechanism that can achieve tristable states and has higher safety.

[0005] In order to solve the above technical problems, this application provides the following technical solutions:

[0006] The present invention provides a ring network cabinet with a three-stable permanent magnet mechanism, including a cabinet body, a pull rod arranged in the cabinet body, a pull rod driving device, a moving contact, a static contact, a second grounding contact, and a vacuum arc chamber. The second grounding contact and the static contact are both fixed in the vacuum arc chamber, the static contact is located below the moving contact, the second grounding contact is located above the moving contact, the lower end of the pull rod extends into the vacuum arc chamber, 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 the pull rod driving device is used to drive the pull rod to move up and down, so that the moving contact contacts the static contact, the moving contact is disconnected from the static contact, and the moving contact contacts the second grounding contact.

[0007] Furthermore, the pull rod drive device includes a regulator, an armature, and a permanent magnet. A hollow cavity is provided on the permanent magnet. The armature is provided in the hollow cavity and the top of the armature extends out of the permanent magnet. The regulator is connected to the armature, and the bottom of the armature is connected to the upper end of the pull rod. The regulator 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 body, vertically arranged, and sleeved outside the armature. The armature is suitable for moving up and down relative to the limiting cylinder.

[0009] Furthermore, the armature limiting assembly further includes a horizontal axis fixedly arranged on the top of the cabinet, and the limiting cylinder is fixedly connected to the horizontal axis.

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

[0011] Furthermore, the permanent magnet includes a shell and a moving iron core, a coil, a static iron core, and a plurality of magnetic steel sheets arranged in the shell. The moving iron core, the coil, and the static iron core are arranged in sequence from top to bottom, and the magnetic steel sheets are connected to the outer wall of the static iron core.

[0012] Furthermore, the static contact includes a static contact seat, a compensation contact, and a compensation spring. A groove is provided on the static contact seat. The compensation contact and the compensation spring are both provided in the groove. The compensation contact is located above the compensation spring. One end of the compensation spring is connected to the bottom of the groove, and the other end is connected to the compensation contact. When the compensation spring is in a natural state, the top of the compensation contact is higher than the top of the static contact seat.

[0013] Furthermore, it also includes a grounding protection device arranged in 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, the first grounding contact is connected to the grounding copper busbar, a busbar is arranged in the cabinet, the busbar is connected to the grounding switch blade, the grounding switch blade is suitable for connecting or disconnecting with 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 a support ear is provided on the drive shaft. One end of the crank arm is hinged to the support ear, and the other end is hinged to the sliding sleeve. The sliding sleeve is sleeved on the grounding switch blade, and the drive shaft is rotated. The drive shaft drives the grounding switch blade to rotate through the crank arm to connect or disconnect the grounding switch blade with the first grounding contact.

[0015] Furthermore, the first grounding contact is L-shaped, and the end of the grounding switch blade that cooperates 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 plugged into the first grounding contact.

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

[0017] The present invention provides a ring network cabinet with a tristable permanent magnet mechanism. Since it includes a pull rod, a pull rod driving device, a moving contact, a static contact, and a second grounding contact, the pull rod driving device is used to drive the pull rod to move up and down, so that the moving contact contacts the static contact, the moving contact and the static contact are disconnected, and the moving contact contacts the second grounding contact. Therefore, the three states of opening, closing, and grounding can be realized, so that the switch cabinet has a tristable state, so that the arc remaining in the ring network cabinet after opening the switch is guided to the ground, thereby improving the safety of the ring network cabinet.

[0018] The ring main unit with a tri-stable permanent magnet mechanism of the present invention will be further described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[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 according to the present invention;

[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 according to the present invention;

[0021] Figure 3 3 is a third front view schematic diagram of the overall structure of the ring main unit with a tristable permanent magnet mechanism according to the present invention;

[0022] Figure 4 4 is a schematic diagram of the overall structure of the ring main unit with a tristable permanent magnet mechanism according to the present invention from a front view;

[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 the present invention;

[0024] Figure 6 yes Figure 1 A partial enlarged view of point A in the middle;

[0025] Figure 7 yes Figure 2 A partial enlarged view of point B in the middle;

[0026] Figure 8 yes Figure 2 A partial enlarged view of point C in the middle;

[0027] Figure 9 yes Figure 2 A partial enlarged view of point D in the middle;

[0028] Figure 10 yes Figure 3 A partial enlarged view of point E in the middle;

[0029] Figure 11 yes Figure 4 A partial enlarged view of point F in the middle;

[0030] Figure 12It is a structural schematic diagram of the static contact in the ring network cabinet with a tri-stable permanent magnet mechanism of the present invention. DETAILED DESCRIPTION

[0031] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 6 、 Figure 8 As shown, the present invention provides a ring network cabinet with a three-stable permanent magnet mechanism, including a cabinet body 1, a pull rod 6 arranged in the cabinet body 1, a pull rod driving device, a moving contact 17, a static contact 18, a second grounding contact 19, and a vacuum arc extinguishing chamber 16. The second grounding contact 19 is used for grounding. The second grounding contact 19 and the static contact 18 are both fixed in the vacuum arc extinguishing chamber 16. The static 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 arc extinguishing chamber 16, and 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 with the static contact 18, the moving contact 17 is disconnected from the static contact 18, and the moving contact 17 contacts with the second grounding contact 19. The arc generated by closing and opening the switch can be eliminated through the vacuum arc extinguishing chamber 16 to avoid the arc affecting the operation 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 movable contact 17, a static contact 18, a second grounding contact 19, and a vacuum interrupter 16 constitute a set of switch components. In this embodiment, three sets of switch components are provided. When a ring main unit with a three-stable permanent magnet mechanism of the present invention is in use, the pull rod driving device drives the pull rod 6 downward, so that the movable contact 17 and the static contact 18 come into contact and close, thereby achieving a first stable state, i.e., closing the circuit breaker; the pull rod driving device drives the pull rod 6 upward, so that the movable contact 17 and the static contact 18 are separated, thereby achieving a second stable state, i.e., opening the circuit breaker; the pull rod driving device drives the pull rod 6 upward to increase the distance the pull rod 6 moves upward, so that the movable contact 17 comes into contact and closes with the second grounding contact 19, thereby achieving a third stable state, i.e., grounding. The present invention provides a ring main unit with a tristable permanent magnet mechanism, which includes a pull rod 6, a pull rod driving device, a moving contact 17, a static contact 18, and a second grounding contact 19. 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 with the static contact 18, the moving contact 17 is disconnected from the static contact 18, and the moving contact 17 contacts with the second grounding contact 19. Therefore, the three states of opening, closing, and grounding can be realized, so that the switch cabinet has a tristable state, so that the arc remaining in the ring main unit after opening the switch is guided to the ground, thereby improving the safety of the ring main unit.

[0032] Alternatively, as Figure 5 、 Figure 7 、 Figure 8As shown, the pull rod drive device includes a regulator 21, an armature 4, and a permanent magnet 5. The permanent magnet 5 is provided with a hollow cavity. The armature 4 is disposed within the hollow cavity, and the top of the armature 4 extends outside the permanent magnet 5. The top of the armature 4 is connected to the regulator 21, and the bottom is connected to the upper end of the pull rod 6. The regulator 21 is used to adjust the direction and magnitude of the current in the armature 4, so that the armature 4 drives the pull rod 6 up and down. Specifically, it also includes two mounting plates 2, both of which are connected to the top plate of the cabinet 1. The two mounting plates 2 form an installation space between the two mounting plates 2, and the permanent magnet 5 is disposed within the installation space. During use, 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 static contact 18 are in contact and closed, thereby realizing the first stable state, i.e., closing the circuit breaker; the direction of the current is adjusted by the regulator 21 so that the current direction of the armature 4 is opposite. 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 is separated from the static contact 18, thereby realizing the second stable state, i.e., opening the circuit breaker; when the current flow direction is made consistent with that in the second stable state and the current intensity increases through the regulator 21, the armature 4 is subjected to a greater upward force from the permanent magnet 5, so that the distance that the armature 4 drives the pull rod 6 to move upward increases, and the moving contact 17 is in contact and closed with the second grounding contact 19, thereby realizing the third stable state, i.e., grounding. The armature 4 is moved up and down by the permanent magnet 5, thereby driving the pull rod 6 to move up and down. There is no need for mechanical opening and closing, which can not only ensure the accuracy of opening and closing, but 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 repair and maintenance difficulty is low.

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

[0034] Alternatively, as Figure 12As shown, the static contact 18 includes a static contact base 180, a compensating contact 182, and a compensating spring 183. The static contact base 180 is provided with a groove 181. 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 static contact base 180. When the moving contact 17 contacts the static contact 18, it first contacts the compensating contact 182, causing the compensating spring 183 to be compressed and the compensating contact 182 to move downward relative to the groove 181. When the top of the compensating contact 182 is flush with the static contact base 180, the moving contact 17 and the static contact 18 are fully engaged, completing the closing operation. By using the compensation contact 182 and the compensation spring 183, a gap between the moving contact 17 and the static contact 18 is avoided, making the closing more stable. At the same time, the deformation of the moving contact 17 and the static contact 18 caused by long-term contact, as well as the gap caused by high-voltage oxidation of the moving contact 17 and the static contact 18 on the contact surface can be compensated, thereby improving the service life of the ring network cabinet.

[0035] Alternatively, as Figure 7 、 Figure 11 As shown, 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 body 1 and is vertically arranged. The limiting cylinder 32 is sleeved outside the armature 4, and the armature 4 is suitable for moving up and down relative to the limiting cylinder 32. The limiting cylinder 32 is used to limit the armature 4 to prevent it from deviating from the vertical direction when moving up and down.

[0036] Optionally, the armature limiting assembly 3 further includes a transverse axis 31 fixedly disposed on the top of the cabinet 1, and a limiting cylinder 32 fixedly connected to the transverse axis 31. In this embodiment, three limiting cylinders 32 are sequentially arranged along the length of the transverse axis 31. A limiting plate 41 is also provided on the top of the armature 4 to limit the upward and downward movement of the armature 4 relative to the limiting cylinder 32.

[0037] Alternatively, as Figure 4 、 Figure 5 、 Figure 9 、 Figure 10As shown, the cabinet 1 also includes a grounding protection device disposed within 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 disposed within 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 with the first grounding contact 10. The 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 groups. The three first grounding contacts 10 are arranged in sequence along the length of the grounding copper busbar 11. The busbars include an A-phase busbar 12, a B-phase busbar 13, and a C-phase busbar 14. The A-phase busbar 12, the B-phase busbar 13, and the C-phase busbar 14 are each 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, and the arc remaining inside the ring network cabinet after the switch is opened is guided to the ground, thereby improving the safety of the ring network cabinet. At the same time, by connecting or disconnecting the grounding switch blade 9 and the first grounding contact 10, when the ring network cabinet is not in use or is in the process of transportation, the grounding switch blade 9 is separated from the first grounding contact 10 to prevent the grounding switch blade 9 or the first grounding contact 10 from being damaged due to vibration. When the ring network cabinet is used, the grounding switch blade 9 is connected to the first grounding contact 10 again to ensure that the grounding switch blade 9 and the first grounding contact 10 have good contact effect and improve the service life of the ring network cabinet.

[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 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 sleeved 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 via the crank arm 8, thereby connecting or disconnecting the grounding switch blade 9 with the first grounding contact 10. Specifically, the drive shaft 7 is a square shaft and 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 cooperates with the first grounding contact 10 is a U-shaped connecting end. When the grounding switch blade 9 is connected to the first grounding contact 10, the U-shaped connecting end is inserted into the first grounding contact 10, so that the grounding switch blade 9 and the first grounding contact 10 cooperate more closely, improve the fitting effect, and improve the stability of the switch.

[0040] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A ring main unit with a tristable permanent magnet mechanism, characterized in that: The invention comprises a cabinet (1), a pull rod (6) arranged in the cabinet (1), a pull rod driving device, a moving contact (17), a static contact (18), a second grounding contact (19), and a vacuum interrupter (16), wherein the second grounding contact (19) and the static contact (18) are both fixed in the vacuum interrupter (16), the static 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 arc extinguishing chamber (16), the moving contact (17) is connected to the lower end of the pull rod (6), and 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 static contact (18), the moving contact (17) is disconnected from the static contact (18), and the moving contact (17) contacts the second grounding contact (19).

2. The ring main unit with a tristable permanent magnet mechanism according to claim 1, characterized in that: The pull rod driving device includes a regulator (21), an armature (4), and a permanent magnet (5). A hollow cavity is provided on the permanent magnet (5). The armature (4) is provided in the hollow cavity and the top of the armature (4) extends out of the permanent magnet (5). The regulator (21) is connected to the armature (4). The bottom of the armature (4) is connected to the upper end of the pull rod (6). The regulator (21) is used to adjust the direction of the current in the armature (4) and the magnitude of the current in the armature (4), so that the armature (4) drives the pull rod (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), the armature limiting assembly (3) includes a limiting cylinder (32), the limiting cylinder (32) is connected to the cabinet (1), the limiting cylinder (32) is vertically arranged, the limiting cylinder (32) is sleeved outside the armature (4), and the armature (4) is suitable for moving 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) further comprises a transverse axis (31) fixedly arranged on the top of the cabinet (1), and the limiting cylinder (32) is fixedly connected to the transverse axis (31).

5. The ring main unit with a tristable permanent magnet mechanism according to claim 4, characterized in that: A limiting plate (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) comprises a shell and a moving iron core (51), a coil (52), a static iron core (53), and a plurality of magnetic steel sheets (54) arranged in the shell. The moving iron core (51), the coil (52), and the static iron core (53) are arranged in sequence from top to bottom, and the magnetic steel sheets (54) are connected to the outer side wall of the static iron core (53).

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

8. The ring main unit with a tristable permanent magnet mechanism according to claim 7, characterized in that: The invention also includes a grounding protection device arranged in the cabinet (1), the grounding protection device including a grounding switch blade (9), a first grounding contact (10), and a grounding copper bar (11), the grounding copper bar (11) is grounded, the first grounding contact (10) is connected to the grounding copper bar (11), a busbar is arranged in the cabinet (1), the busbar is connected to the grounding switch blade (9), the grounding switch blade (9) is suitable for connecting or disconnecting with the first grounding contact (10), and 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 further comprises a switch blade drive assembly, the switch blade drive assembly comprising 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; a support ear (71) is provided on the drive shaft (7); one end of the crank arm (8) is hinged to the support ear (71) and the other end is hinged to the sliding sleeve (81); the sliding sleeve (81) is sleeved on the grounding switch blade (9); the drive shaft (7) is rotated, and 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 to or disconnected from the first grounding contact (10).

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

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