Ring main unit with tristable permanent magnet mechanism

Abstract

The application relates to a power device, in particular to a ring network cabinet with a three-stable permanent magnet 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, the second grounding contact and the static contact are 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 of the pull rod, the pull rod driving device is connected with the pull rod, the pull rod driving device is used for driving the pull rod to move up and down, so that 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. The application can realize three-stable state and higher safety.

Description

TECHNICAL FIELD

[0001] The application relates to a power equipment, in particular to a ring network cabinet with a three-stable permanent magnetic mechanism. BACKGROUND

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

[0003] The existing high-voltage switch equipment drives an insulation pull rod through a control mechanism, so that a vacuum circuit breaker realizes closing or opening, but due to the limitation of the structure, the high-voltage switch can only realize a double-stable state, that is, can only realize the states of opening and closing, and cannot realize an automatic grounding state, so the safety cannot be guaranteed. SUMMARY

[0004] The application aims to solve the technical problem of providing a ring network cabinet with a three-stable permanent magnetic mechanism which can realize three-stable states and is safer.

[0005] In order to solve the above technical problem, the application provides the following technical scheme:

[0006] The application provides a ring network cabinet 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, the second grounding contact and the static contact are 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 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 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.

[0007] Further, the pull rod driving device comprises an adjuster, an armature and a permanent magnet, the permanent magnet is provided with a hollow cavity, the armature is arranged in the hollow cavity and the top of the armature extends out of the permanent magnet, the adjuster is connected to the armature, the bottom of the armature is connected to the upper end of the pull rod, and the adjuster is used to adjust the direction and size of the current in the armature, so that the armature drives the pull rod to move up and down.

[0008] Further, the pull rod driving device further comprises an armature limiting assembly, the armature limiting assembly comprises a limiting cylinder, the limiting cylinder is connected to the cabinet body, the limiting cylinder is vertically arranged, the limiting cylinder is sleeved outside the armature, and the armature is adapted to move up and down relative to the limiting cylinder.

[0009] Further, the armature limiting assembly further comprises a horizontal shaft fixedly arranged on the top of the cabinet body, and the limiting cylinder is fixedly connected to the horizontal shaft.

[0010] Further, the top of the armature is further provided with a limiting sheet.

[0011] Further, the permanent magnet comprises a shell, 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 sequentially arranged from top to bottom, and the magnetic steel sheets are connected to the outer side wall of the static iron core.

[0012] Further, the static contact comprises a static contact seat, a compensation contact and a compensation spring, the static contact seat is provided with a groove, the compensation contact and the compensation spring are arranged 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, the other end of the compensation spring is connected to the compensation contact, and the top of the compensation contact is higher than the top of the static contact seat when the compensation spring is in a natural state.

[0013] Further, the grounding protection device arranged in the cabinet body further comprises a grounding switch blade, a first grounding contact and a grounding copper bar, the grounding copper bar is grounded, the first grounding contact is connected to the grounding copper bar, a bus is arranged in the cabinet body, the bus is connected to the grounding switch blade, the grounding switch blade is adapted to be connected or disconnected to the first grounding contact, and the second grounding contact is connected to the grounding switch blade.

[0014] Further, the grounding protection device further comprises a switch blade driving assembly, the switch blade driving assembly comprises a driving shaft, a crank arm and a sliding sleeve, the driving shaft is connected to the inner wall of the cabinet body, the crank arm is arc-shaped, the driving shaft is provided with a lug, one end of the crank arm is hinged to the lug, and the other end of the crank arm is hinged to the sliding sleeve, and the sliding sleeve is sleeved on the grounding switch blade, the driving shaft is rotated, the driving shaft drives the grounding switch blade to rotate through the crank arm, so that the grounding switch blade is connected or disconnected to the first grounding contact.

[0015] Further, the first grounding contact is L-shaped, one end of the grounding switch blade matched with the first grounding contact is a U-shaped connecting end, and when the grounding switch blade is connected to the first grounding contact, the U-shaped connecting end is inserted on the first grounding contact.

[0016] Compared with the prior art, the ring main unit with the three-stable permanent magnet mechanism has at least the following beneficial effects:

[0017] The ring main unit with the three-stable permanent magnetic mechanism comprises 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 for driving the pull rod to move up and down, so that 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, thereby realizing three states of opening, closing and grounding, so that the switch cabinet has three stable states, and the residual arc in the ring main unit after opening is guided to the ground, and the safety of the ring main unit is improved.

[0018] The ring main unit with the three-stable permanent magnetic mechanism will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a first front overall structure schematic diagram of the ring main unit with the three-stable permanent magnetic mechanism of the application;

[0020] Figure 2 is a second front overall structure schematic diagram of the ring main unit with the three-stable permanent magnetic mechanism of the application;

[0021] Figure 3 is a third front overall structure schematic diagram of the ring main unit with the three-stable permanent magnetic mechanism of the application;

[0022] Figure 4 is a fourth front overall structure schematic diagram of the ring main unit with the three-stable permanent magnetic mechanism of the application;

[0023] Figure 5 is a rear overall structure schematic diagram of the ring main unit with the three-stable permanent magnetic mechanism of the application;

[0024] Figure 6 is Figure 1 a local enlarged view of A in FIG.

[0025] Figure 7 is Figure 2 a local enlarged view of B in FIG.

[0026] Figure 8 is Figure 2 a local enlarged view of C in FIG.

[0027] Figure 9 is Figure 2 a local enlarged view of D in FIG.

[0028] Figure 10 is Figure 3 a local enlarged view of E in FIG.

[0029] Figure 11 is Figure 4 a local enlarged view of F in FIG.

[0030] Figure 12It is a structure schematic view of the static contact of the ring main unit with the three-stable permanent magnetic mechanism. DETAILED DESCRIPTION

[0031] As Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 8 indicated, the ring main unit with the three-stable permanent magnetic mechanism 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 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. 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. The pull rod driving device is connected with the pull rod 6. The pull rod driving device is used for driving the pull rod 6 to move up and down, so as to make the moving contact 17 contact with the static contact 18, the moving contact 17 separate from the static contact 18, and the moving contact 17 contact with the second grounding contact 19. The vacuum arc-extinguishing chamber 16 can extinguish the arc generated by closing and opening, so as to avoid the influence of the arc on the operation safety. Specifically, the second grounding contact 19 is circular. The lower end of the pull rod 6 penetrates through the second grounding contact 19. One pull rod 6, the pull rod driving device, the moving contact 17, the static contact 18, the second grounding contact 19, and the vacuum arc-extinguishing chamber 16 form a group of switch components. In this embodiment, three groups of switch components are arranged. When the ring main unit with the three-stable permanent magnetic mechanism is used, the pull rod driving device drives the pull rod 6 to move downward, so that the moving contact 17 contacts and closes with the static contact 18, to realize the first stable state, i.e., closing. The pull rod driving device drives the pull rod 6 to move upward, so that the moving contact 17 separates from the static contact 18, to realize the second stable state, i.e., opening. The pull rod driving device drives the pull rod 6 to move upward by a larger distance, so that the moving contact 17 contacts and closes with the second grounding contact 19, to realize the third stable state, i.e., grounding. The ring main unit with the three-stable permanent magnetic mechanism comprises the pull rod 6, the pull rod driving device, the moving contact 17, the static contact 18, and the second grounding contact 19. The pull rod driving device is used for driving the pull rod 6 to move up and down, so as to make the moving contact 17 contact with the static contact 18, the moving contact 17 separate from the static contact 18, and the moving contact 17 contact with the second grounding contact 19. Therefore, the opening, closing, and grounding three states can be realized, the switch cabinet has the three stable states, and the residual arc in the ring main unit after opening is guided to the ground, so as to improve the safety of the ring main unit.

[0032] Optionally, as Figure 5 , Figure 7 , Figure 8As shown, the pull rod driving device comprises an adjuster 21, an armature 4, a permanent magnet 5, the permanent magnet 5 is provided with a hollow cavity, the armature 4 is arranged in the hollow cavity and the top of the armature 4 extends out of the permanent magnet 5, the top of the armature 4 is connected with the adjuster 21 and the bottom of the armature 4 is connected with the upper end of the pull rod 6, the adjuster 21 is used for adjusting the direction of the current in the armature 4 and the size of the current in the armature 4, so that the armature 4 drives the pull rod 6 to move up and down. Specifically, it also comprises two mounting plates 2, both of which are connected to the top plate of the cabinet 1, and the mounting space is formed between the two mounting plates 2, and the permanent magnet 5 is arranged in the mounting space. In use, the direction of the current is adjusted by the adjuster 21, the armature 4 is subjected to a downward force under the action of the permanent magnet 5, drives the pull rod 6 to move downward, so that the movable contact 17 and the static contact 18 are in contact and tightly closed, realizing the first stable state, i.e. closing; the direction of the current is adjusted by the adjuster 21, so that the direction of the current in the armature 4 is opposite, the armature 4 is subjected to an upward force of the permanent magnet 5, drives the pull rod 6 to move upward, so that the movable contact 17 and the static contact 18 are separated, realizing the second stable state, i.e. opening; the current flowing direction is consistent with that in the second stable state and the current intensity is increased by the adjuster 21, the armature 4 is subjected to a greater upward force of the permanent magnet 5, so that the distance of the armature 4 driving the pull rod 6 to move upward is increased, the movable contact 17 and the second grounding contact 19 are in contact and tightly closed, 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, without the need for mechanical opening and closing, which not only ensures the accuracy of opening and closing, but also improves the safety and reliability of the opening and closing process; the precise control of the armature 4 is realized by changing the direction and intensity of the current, which improves the stability and safety of the high-voltage switchgear, and the structure is simple, the operation is simple, and the maintenance difficulty is low.

[0033] Optionally, as shown in Figure 11 The permanent magnet 5 comprises a shell, 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. Specifically, the coil 52 and the static iron core 53 are fixed on the inner side wall of the shell, the moving iron core 51, the coil 52 and the static iron core 53 are all circular rings, which can improve the stability and reliability of the permanent magnet 5, the magnetic steel sheets 54 are circular arc sheets, and a plurality of magnetic steel sheets 54 are attached to the outer circumferential surface of the static iron core 53 at equal intervals, and the magnetic property of the permanent magnet 5 is enhanced by the magnetic steel sheets 54.

[0034] Optionally, as shown in Figure 12As shown, the static contact 18 comprises a static contact seat 180, a compensation contact 182, and a compensation spring 183. The compensation contact 182 and the compensation spring 183 are arranged in a recess 181 of the static contact seat 180. The compensation contact 182 is above the compensation spring 183. One end of the compensation spring 183 is connected to the bottom of the recess 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. When the moving contact 17 contacts the static contact 18, the compensation contact 182 is contacted first, so that the compensation spring 183 is compressed, and the compensation contact 182 moves downward relative to the recess 181. When the top of the compensation contact 182 is flush with the static contact seat 180, the moving contact 17 and the static contact 18 are completely attached, and the closing is completed. Through the compensation contact 182 and the compensation spring 183, the gap between the moving contact 17 and the static contact 18 is avoided, the closing is more stable, the deformation of the moving contact 17 and the static contact 18 due to long-time contact is compensated, the gap generated by the high-pressure oxidation of the contact surface of the moving contact 17 and the static contact 18 is compensated, and the service life of the ring network cabinet is improved.

[0035] Optionally, as shown in Figure 7 , Figure 11 , the pull rod driving device further comprises an armature limiting assembly 3. The armature limiting assembly 3 comprises 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 on 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 to avoid deviation from the vertical direction.

[0036] Optionally, the armature limiting assembly 3 further comprises a horizontal shaft 31 fixedly arranged on the top of the cabinet body 1. The limiting cylinder 32 is fixedly connected to the horizontal shaft 31. In this embodiment, three limiting cylinders 32 are sequentially arranged along the length direction of the horizontal shaft 31. The top of the armature 4 is further provided with a limiting piece 41 for limiting the upward and downward movement of the armature 4 relative to the limiting cylinder 32.

[0037] Optionally, as shown in Figure 4 , Figure 5 , Figure 9 , Figure 10As shown, the grounding protection device is arranged in the cabinet 1, and includes grounding switch blades 9, first grounding contacts 10, and a grounding copper bar 11. The grounding copper bar 11 is grounded, and the first grounding contacts 10 are connected to the grounding copper bar 11. A bus is arranged in the cabinet 1, and is connected to the grounding switch blades 9. The grounding switch blades 9 are adapted to be connected to or disconnected from the first grounding contacts 10. A second grounding contact 19 is connected to the grounding switch blades 9 through a wire 20. In this embodiment, the grounding protection device is provided with three groups of the first grounding contacts 10, which are arranged along the length direction of the grounding copper bar 11 in sequence. The bus includes an A-phase bus 12, a B-phase bus 13, and a C-phase bus 14, which are respectively connected to one of the grounding switch blades 9. Since the second grounding contact 19 is electrically connected to the grounding switch blades 9, when the grounding switch blades 9 are connected to the first grounding contacts 10, the second grounding contact 19 can be grounded through the first grounding contacts 10, so as to guide the residual electric arc in the ring main unit after the switch is opened to the ground, thereby improving the safety of the ring main unit. Meanwhile, by connecting or disconnecting the grounding switch blades 9 to the first grounding contacts 10, the grounding switch blades 9 are separated from the first grounding contacts 10 when the ring main unit is not used or is in the process of transportation, so as to prevent the grounding switch blades 9 or the first grounding contacts 10 from being damaged due to vibration. When the ring main unit is used, the grounding switch blades 9 are connected to the first grounding contacts 10 again, so as to ensure that the grounding switch blades 9 and the first grounding contacts 10 have good contact effect, and improve the service life of the ring main unit.

[0038] Optionally, the grounding protection device further includes a switch blade driving assembly, which includes a driving shaft 7, a crank arm 8, and a sliding sleeve 81. The driving shaft 7 is connected to the inner wall of the cabinet 1. The crank arm 8 is arc-shaped. The driving 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 sleeved on the grounding switch blade 9. By rotating the driving shaft 7, the driving shaft 7 drives the grounding switch blade 9 to rotate, so as to connect or disconnect the grounding switch blade 9 to the first grounding contacts 10. Specifically, the driving shaft 7 is a square shaft, and the driving shaft 7 is rotatably connected to the inner wall of the cabinet 1.

[0039] Optionally, the first grounding contact 10 is L-shaped, and one end of the grounding switch blade 9, which is matched 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 are matched more closely, the fitting effect is improved, and the stability of the switch is improved.

[0040] The above-described embodiments are merely intended to describe the preferred embodiments of the present application, and are not intended to limit the scope of the present application. Various modifications and improvements to the present application made by those skilled in the art are intended to fall within the scope of the present application defined in the claims.

Claims

1. A ring main unit with a tristable permanent magnet mechanism, characterized in that, The system includes a cabinet (1), a pull rod (6) installed inside 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) and the stationary contact (18) are both fixed inside 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), and the moving contact (17) contacts the stationary contact (18). The head (18) is disconnected, and the moving contact (17) contacts the second grounding contact (19). The lever drive device includes an adjuster (21), an armature (4), and a permanent magnet (5). The stationary contact (18) includes a stationary contact seat (180), a compensation contact (182), and a compensation spring (183). The stationary contact seat (180) is provided with a groove (181). 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 its natural state, the top of the compensation contact (182) is higher than the top of the stationary contact seat (180).

2. The ring main unit with a tristable permanent magnet mechanism according to claim 1, characterized in that, The permanent magnet (5) is provided with a hollow cavity, 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 lever drive device further includes an armature limiting component (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 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, The armature (4) is also provided with a limiting plate (41) at the top.

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 claim 6, characterized in that, It also includes a grounding protection device installed in 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 in 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).

8. The ring main unit with a tristable permanent magnet mechanism according to claim 7, 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).

9. The ring main unit with a tristable permanent magnet mechanism according to claim 8, 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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