A reverse interlocking device for a gas-insulated switchgear grounding system

Abstract

The present invention discloses a reverse locking device for a grounding system of a gas-insulated switchgear, comprising an elastic component, a transmission component, a first limiting component, and a second limiting component; the elastic component abuts against the cable chamber door, and when the cable chamber is closed / opened, the elastic component can be squeezed or released; the transmission component is driven to move due to the restoring force of the elastic component; the first limiting component is driven to move by the movement of the transmission component; the movement of the first limiting component drives the second limiting component to rotate, and when the first limiting component moves to the maximum limit, it can drive the second limiting component to limit / disengage with the circuit breaker, thereby locking / unlocking the circuit breaker. The reverse locking device provided by this solution will automatically take effect when the cable chamber door is opened during maintenance, thereby increasing the reliability and safety of the equipment, thereby avoiding accidents caused by the line side being energized during maintenance and overhaul.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical manufacturing, in particular to a reverse locking device of a gas insulated switchgear grounding system. BACKGROUND

[0002] In the field of medium voltage power transmission and distribution equipment, the conventional gas insulated switchgear stipulates that the line side main circuit of the switchgear must be grounded when the equipment is overhauled and maintained, so as to ensure the safety of the overhaul personnel and the equipment and avoid accidents.

[0003] However, the grounding system of the conventional gas insulated switchgear is usually a direct-acting grounding switch combined with a circuit breaker to form a complete grounding system due to the layout of the entire switchgear. Because the action speed of the direct-acting grounding switch is slow, the direct-acting grounding switch cannot bear the charge load alone when grounding, and needs to rely on the circuit breaker to bear the load of opening and closing. This results in that during normal equipment overhaul and maintenance, the grounding system needs to close the direct-acting grounding switch first, and then close the circuit breaker to complete the grounding operation of the complete grounding system. Conversely, if the grounding system needs to be disconnected after maintenance, the circuit breaker must be opened first, and then the direct-acting grounding switch is opened. In fact, once the circuit breaker is opened, the entire grounding system has failed. Therefore, during the maintenance of the line side after the cable chamber door is opened, if the circuit breaker is mistakenly operated, the grounding system will fail, and if the line side main circuit in the cable chamber is live at this time, an accident will inevitably occur, causing damage to the maintenance personnel and equipment.

[0004] Therefore, the existing grounding system of the gas insulated switchgear has the technical problem of insufficient reliability due to the above technical problems. Therefore, how to improve the reliability of the grounding system of the gas insulated switchgear is a problem to be solved in the field. SUMMARY

[0005] In view of the technical problem of low reliability of the existing grounding system of the gas insulated switchgear, the purpose of the present application is to provide a reverse locking device of a gas insulated switchgear grounding system, which automatically activates when the cable chamber door is opened during maintenance, increases the reliability and safety of the equipment, and thus avoids accidents caused by live line side during maintenance.

[0006] In order to achieve the above object, the application provides a reverse locking device of a gas insulation switch cabinet grounding system, which comprises an elastic component, a transmission component, a first limiting component and a second limiting component; the elastic component is in abutment with a cable chamber door, and can be extruded or released when the cable chamber is closed / opened; the transmission component is connected with the elastic component, and is driven to move by the restoring force of the elastic component; the first limiting component is connected with the transmission component, and is moved by the movement of the transmission component; the second limiting component is connected with the first limiting component, and is rotated by the movement of the first limiting component, and can drive the second limiting component to be in limiting / away from the circuit breaker when the first limiting component moves to the maximum limit, thereby locking / unlocking the circuit breaker.

[0007] Further, the second limiting component comprises a limiting plate and an interlocking bent plate, the limiting plate is connected with an inside part of a circuit breaker mechanism and is fastened by a fastener, and when the inside part is rotated by an opening operation, the limiting plate moves with the inside part; the interlocking bent plate is installed on the mounting plate and can rotate freely relative to the limiting plate, and when the interlocking bent plate is rotated to the bottom of the limiting plate, the limiting plate is limited by the interlocking bent plate and cannot rotate around the inside part, i.e. the inside part cannot rotate.

[0008] Further, the bottom of the interlocking bent plate is provided with an oblong hole, which is used for connecting with the first limiting component.

[0009] Further, the first limiting component comprises a short pin, a long connecting plate and a bolt; the short pin is fixed on the long connecting plate, and the short pin is inserted into the oblong hole of the interlocking bent plate, so that the interlocking bent plate can rotate with the movement of the short pin; the long connecting plate is symmetrically provided with two oblong holes, and the two oblong holes are respectively provided with bolts and are assembled and connected with the mounting plate; when the bolts are fastened, the long connecting plate and the short pin move vertically relative to the bolts, so as to drive the interlocking bent plate connected with the short pin to rotate relative to the limiting plate and be in limiting / away from the limiting plate.

[0010] Further, the bottom of the long connecting plate is further provided with an oblong hole, which is used for connecting with the transmission component.

[0011] Further, the transmission component comprises a bracket, a transmission bent plate, a shaft, a transmission pin, a short connecting plate, a anti-loosening stopper, a crank arm and a hanging plate;

[0012] The bracket is installed below the lower frame plate and is fixed by a fastener, the transmission bent plate is connected with the bracket through the shaft and is clamped at both ends by the anti-loosening stopper, and the transmission bent plate can rotate around the center line of the shaft;

[0013] The transmission bending plate is welded with a transmission pin at each end, one of which is inserted into a long circular hole at the bottom of the long connecting plate, and the other is inserted into a hole at one end of the short connecting plate and is clamped by a anti-loosening block;

[0014] The other end of the short connecting plate is connected with one end of the toggle arm through a connecting piece, and the short connecting plate and the toggle arm can rotate freely around the axis of the connecting piece.

[0015] The central hole of the toggle arm is installed with a hanging plate through a connecting piece, and the toggle arm can rotate freely around the axis of the connecting piece; the hanging plate is installed on the fixed partition plate.

[0016] Further, a long circular hole is arranged below the toggle arm, which is used for connecting with an elastic assembly.

[0017] Further, the elastic assembly comprises a connecting head, a top rod, a transmission sleeve and a reset spring; the connecting head is connected with the long circular hole at the lower part of the toggle arm, the connecting head and the top rod are connected in a matched mode, so that the connecting head and the top rod are relatively fixed and immovable; the transmission sleeve is arranged in the hole of the partition plate, and the reset spring is arranged inside the transmission sleeve and is sleeved on the top rod; the boss surface of the top rod is always pushed by the reset spring, and the top rod protrudes from the partition plate in a natural state.

[0018] The reverse locking device of the gas insulated switch cabinet grounding system provided by the application can drive the reverse locking device of the application through the driving force of the opening of the cable chamber door when the cable chamber door is opened after the line side grounding of the switch cabinet, the reverse locking device is actuated and limits the circuit breaker, so that the circuit breaker cannot be rotated to open, thereby preventing the failure of the grounding system caused by the misoperation of the circuit breaker, increasing the reliability and safety of the equipment, thereby avoiding accidents caused by the live line side during maintenance and maintenance, and protecting the life safety of the operator. BRIEF DESCRIPTION OF DRAWINGS

[0019] The application will be further described in combination with the drawings and specific embodiments.

[0020] Figure 1 It is a schematic view of the assembly structure of the reverse locking device of the gas insulated switch cabinet grounding system.

[0021] Figure 2 It is a structure perspective view of the reverse locking device of the gas insulated switch cabinet grounding system.

[0022] Figure 3 It is a structure plan view of the reverse locking device of the gas insulated switch cabinet grounding system.

[0023] Figure 4 It is a structure side view of the reverse locking device of the gas insulated switch cabinet grounding system.

[0024] The following is a component labeling description in the drawings:

[0025] 101. switch cabinet 102. circuit breaker mechanism 103. circuit breaker switch 104. circuit breaker frame 105. cable chamber door 106. frame component 1. opening half shaft 2. first fastener 3. limit plate 4. interlocking bent plate 5. short pin 6. first stepped bolt 7. second stepped bolt 8. long connecting plate 9. bracket 10. shaft 11. transmission bent plate 12. short connecting plate 13. third stepped bolt 14. second fastener 15. hanging plate 16. First locking nut 17. crank arm 18. First gasket 19. Pin 20. Cotter pin 21. Second locking nut 22. Second gasket 23. Third fastener 24. Anti-loosening stop 25. Transmission pin 26. Third locking nut 27. Fourth stepped bolt 28. Mounting plate 29. Mounting support 30. Fourth fastener 31. Lower frame plate 32. Middle partition plate 33. Transmission sleeve 34. Fourth locking nut 35. Top rod 36. Reset spring 37. Fifth locking nut 38. Spring washer 39. Connector. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the following will be further described in combination with specific drawings.

[0027] The existing gas insulated switch cabinet grounding system has low reliability. In view of this technical problem, the present application provides a reverse interlocking device of a gas insulated switch cabinet grounding system. The reverse interlocking device is assembled and connected with the cable chamber door of the gas insulated switch cabinet. When the cable chamber door is opened for maintenance, the reverse interlocking device of the present application is driven by the driving force of the opening of the cable chamber door. The reverse interlocking device acts and limits the circuit breaker, so that it cannot rotate to open. Thus, the failure of the grounding system caused by the misoperation of the circuit breaker is prevented, the reliability and safety of the equipment are increased, and the safety of the operating personnel is protected from accidents caused by live lines during maintenance and maintenance.

[0028] Among them, see Figure 1 and Figure 4 For the mounting plate 28 in the gas insulated switch cabinet, it is a part of the circuit breaker mechanism 102, which is fixed with the mounting support 29 by the fourth fastener 30. The mounting support 29 is welded with the lower frame plate 31, which is part of the circuit breaker frame 104, and are all fixed together and fixed. The circuit breaker switch 103 and the frame component 106 are part of the switch cabinet 101, and are fixed in position after installation, i.e. the mounting plate 28, the mounting support 29, the lower frame plate 31 and the middle partition plate 32 are fixed; the cable chamber door 105 is installed on the frame component 106.

[0029] The application provides a reverse locking device of a gas insulated switch cabinet grounding system. Figure 1 The reverse locking device is installed in the gas insulated switch cabinet, the upper half is installed on the one side mounting plate 28 of the circuit breaker mechanism 102 inside the circuit breaker switch 103, and the lower half is matched with the cable chamber door 105 of the frame component 106 to finally form the reverse locking.

[0030] The reverse locking device of the gas insulated switch cabinet grounding system comprises an elastic component, a transmission component, a first limiting component and a second limiting component.

[0031] The elastic component is in abutment with the cable chamber door, and the elastic component is extruded when the cable chamber is in a closed state.

[0032] The transmission component is connected with the elastic component in a matched mode, and the transmission component is driven to move due to the restoring force of the elastic component.

[0033] The first limiting component is connected with the transmission component in a matched mode, and the first limiting component is driven to move by the movement of the transmission component.

[0034] The second limiting component is connected with the first limiting component in a matched mode, the movement of the first limiting component drives the second limiting component to rotate, and when the first limiting component moves to the maximum limit, the second limiting component is driven to be in contact with or separated from the circuit breaker, thereby locking or unlocking the circuit breaker.

[0035] Further, the structure of the reverse locking device of the gas insulated switch cabinet grounding system in the scheme is shown in Figures 2-4 .

[0036] The second limiting component is used for locking or unlocking the circuit breaker, and the second limiting component comprises a limiting plate 3 and an interlocking bent plate 4.

[0037] The limiting plate 3 is connected with the inside part of the circuit breaker mechanism 102, that is, the opening half shaft 1, in a matched mode and is fastened by a first fastener 2, when the opening half shaft 1 is rotated by the opening operation, the limiting plate 3 moves with the opening half shaft 1.

[0038] The interlocking bent plate 4 is installed on the mounting plate 28 and is connected by using a first stepped bolt 6 in a matched mode, a second gasket 22 is interposed, and the stepped height of the first stepped bolt 6 is slightly greater than the thickness of the interlocking bent plate 4 plus the gasket second gasket 22.

[0039] After the first step bolt 6 is fastened, the interlocking bent plate 4 can rotate freely relative to the limiting plate 3, when the interlocking bent plate 4 is rotated to the bottom of the limiting plate 3, the limiting plate 3 can be stopped by the interlocking bent plate 4, the limiting plate 3 cannot rotate around the opening shaft 1, that is, the opening shaft 1 cannot rotate; at this time, the opening operation of the circuit breaker 103 is locked, the circuit breaker 103 cannot be opened, and the reverse locking device of the grounding system is effective; that is, in the case that the cable chamber door 105 is opened, the grounding system always maintains the closed state.

[0040] The bottom of the interlocking bent plate 4 is provided with an oblong hole, which is used to connect with the first limiting assembly, the first limiting assembly is connected with the interlocking bent plate 4, and the rotating angle of the interlocking bent plate 4 relative to the limiting plate 3 can be controlled by the moving distance, when the first limiting assembly moves to the maximum limit, the interlocking bent plate 4 stops rotating, and just stops below the limiting plate 3, thereby limiting the rotation of the limiting plate 3. The first limiting assembly comprises a short pin 5, a long connecting plate 8 and a second step bolt 7.

[0041] The short pin 5 is welded on the long connecting plate 8 and moves with the long connecting plate 8; the short pin 5 is inserted into the oblong hole of the interlocking bent plate 4, and the interlocking bent plate 4 can rotate with the movement of the short pin 5.

[0042] The long connecting plate 8 is symmetrically provided with two oblong holes, the second step bolt 7 is arranged in each of the two oblong holes and is assembled and connected with the mounting plate 28, the step height of the second step bolt 7 is slightly larger than the thickness of the long connecting plate 8, and the two second step bolts 7 are vertically in line, so that, after the second step bolt 7 is fastened, the long connecting plate 8 can only move vertically relative to the second step bolt 7, and when the long connecting plate 8 moves vertically, the short pin 5 also moves vertically with the long connecting plate 8, and in the process of vertical movement of the short pin 5, the interlocking bent plate 4 connected with the short pin 5 can drive the limiting plate 3 to rotate back and forth relative to the limiting plate 3 and be limited / detached from the limiting plate 3.

[0043] It should be noted that the length of the two oblong holes on the long connecting plate 8 is calculated to limit the vertical displacement of the long connecting plate 8, so that the rotating angle of the interlocking bent plate 4 meets the requirements of the overall interlocking design.

[0044] Secondly, the bottom of the long connecting plate 8 is also provided with an oblong hole, which is used to connect with the transmission assembly, the transmission assembly is connected with the first limiting assembly, and is used to transmit the restoring force of the elastic assembly to the first limiting assembly, so as to drive the first limiting assembly to move upward or downward. The transmission assembly comprises a bracket 9, a transmission bent plate 11, a shaft 10, a transmission pin 25, a short connecting plate 12, a anti-loosening block 24, a crank arm 17 and a hanging plate 15.

[0045] The bracket 9 is installed below the lower frame plate 31 and fixed by the third fastener 23, the transmission bent plate 11 is connected with the bracket 9 through the shaft 10, the both ends of the shaft 10 are clamped by the anti-loosening block 24, the transmission bent plate 11 can only rotate around the center line of the shaft 10 and cannot move axially along the center line of the shaft 10.

[0046] The both ends of the transmission bent plate 11 are welded with a transmission pin 25, one of which is inserted into the long circular hole in the bottom of the long connecting plate 8, and the other is inserted into the hole in one end of the short connecting plate 12 and clamped by the anti-loosening block 24.

[0047] The other end of the short connecting plate 12 is connected with one end of the toggle arm 17 through the third stepped bolt 13 and fastened by the third locking nut 26, the stepped height of the third stepped bolt 13 is slightly larger than the thickness of the short connecting plate 12 plus the toggle arm 17, and the short connecting plate 12 and the toggle arm 17 can rotate freely around the shaft center of the third stepped bolt 13.

[0048] The center hole of the toggle arm 17 and the hanging plate 15 are installed together by the fourth stepped bolt 27 and fastened by the second locking nut 21, the stepped height of the fourth stepped bolt 27 is slightly larger than the thickness of the hanging plate 15 plus the toggle arm 17, after fastening, the hanging plate 15 is fixed, and the toggle arm 17 can rotate freely around the shaft center of the fourth stepped bolt 27, and the toggle arm 17 can only rotate and cannot move.

[0049] The hanging plate 15 is installed by the second fastener 14 and the first locking nut 16 and fixed on the middle partition plate 32.

[0050] When the toggle arm 17 is subjected to tension, it rotates around the shaft center of the fourth stepped bolt 27 with the hole on the hanging plate 15 as the center, and the short connecting plate 12 moves downward under the force;

[0051] When the short connecting plate 12 moves downward under the force, it moves the transmission pin 25 welded to the transmission bent plate 11, so that the transmission bent plate 11 rotates around the center line of the shaft 10, the transmission pin 25 welded to the other end of the transmission bent plate 11 is inserted into the long circular hole of the long connecting plate 8, and the transmission bent plate 11 rotates to pull the long connecting plate 8 to move linearly downward;

[0052] The long connecting plate 8 moves linearly downward under the pulling of the transmission pin 25, and the short pin 5 welded to the long connecting plate 8 pushes the interlocking bent plate 4 to rotate around the center of the first stepped bolt 6; the interlocking bent plate 4 rotates relative to the limiting plate 3 to a position below the limiting plate 3, limiting the limiting plate 3, and further locking the circuit breaker.

[0053] Similarly, when the direction of movement is opposite, the interlocking bent plate 4 can be rotated relative to the limiting plate 3 to a position away from the limiting plate 3, and the circuit breaker can be unlocked.

[0054] Further, the elbow arm 17 is provided with a long circular hole below, which is used to connect with the elastic assembly, and the elastic assembly is connected with the cable chamber door 105 and the transmission assembly respectively. The elastic assembly can be released / compressed by opening or closing the cable chamber door 105, so as to drive the transmission assembly to drive. The elastic assembly comprises a connecting head 39, a top rod 35, a transmission sleeve 33 and a reset spring 36.

[0055] The connecting head 39 is connected with the long circular hole of the lower part of the elbow arm 17 through the pin 19, and the first gasket 18 is added and the opening pin 20 is punched.

[0056] The connecting head 39 and the top rod 35 are screwed, and after being adjusted to the appropriate position, the fifth locking nut 37 and the spring washer 38 are used to tighten, so that the connecting head 39 and the top rod 35 are relatively fixed and immovable.

[0057] The transmission sleeve 33 is arranged in the hole of the partition plate 32 and is fastened in the hole of the partition plate 32 through the fourth locking nut 34 to be fixed immovably; the reset spring 36 is arranged inside the transmission sleeve 33 and is sleeved on the top rod 35, the boss surface of the top rod 35 is always pushed by the reset spring 36, the top rod 35 protrudes from the partition plate 32 in the natural state, and the top rod 35 is limited by the inner hole of the transmission sleeve 33 and can only move linearly along the center line of the inner hole of the transmission sleeve 33.

[0058] When the cable chamber door 105 is closed, the cable chamber door 105 presses the top rod 33 to move into the cabinet, so that the boss surface of the top rod 33 pushes the reset spring 36 to make compression movement, the connecting head 39 moves into the cabinet with the top rod 35, and the elbow arm 17 is pushed by the connecting head 39 at this time.

[0059] When the cable chamber door 105 is opened, the boss surface of the top rod 33 pressed by the cable chamber door 105 is pushed to move to the cable chamber door 105 direction by the restoring force of the reset spring 36, the connecting head 39 moves to the cable chamber door with the top rod 35, and the elbow arm 17 is pulled by the connecting head 39 at this time.

[0060] The reverse interlocking device of the gas insulation switch cabinet grounding system based on the above scheme will be illustrated below in the working process in the specific application, and the specific working process is as follows:

[0061] When the switch cabinet primary circuit equipment needs to be overhauled, the grounding system is closed after power failure, that is, the direct-acting grounding switch and the circuit breaker complete the closing operation. Before starting the overhaul of the line side, the cable chamber door needs to be opened.

[0062] When the cable chamber door 105 is opened, the boss surface of the top rod 33 pressed by the cable chamber door 105 is pushed to move to the cable chamber door 105 direction by the restoring force of the reset spring 36, the connecting head 39 moves to the cable chamber door with the top rod 35, and the elbow arm 17 is pulled by the connecting head 39 at this time.

[0063] When the crank arm 17 is pulled, the short connecting plate 12 moves downward around the axis of the fourth stepped bolt 27 with the hole on the hanging plate 15 as the center;

[0064] When the short connecting plate 12 moves downward, the transmission bent plate 11 moves, and the transmission bent plate 11 rotates around the center line of the shaft 10. The transmission pin 25 at the other end of the transmission bent plate 11 is inserted into the long circular hole of the long connecting plate 8, and the transmission bent plate 11 rotates to push the long connecting plate 8 to move linearly downward.

[0065] The transmission pin 25 pushes the long connecting plate 8 to move linearly downward, and the short pin 5 welded on the long connecting plate 8 pushes the interlocking bent plate 4 to rotate around the center of the first stepped bolt 6. The interlocking bent plate 4 rotates to the bottom of the limiting plate 3 and abuts against the limiting plate 3. When the disconnecting half shaft 1 rotates due to the disconnecting operation, the limiting plate 3 moves with the disconnecting half shaft 1. The limiting plate 3 is limited by the interlocking bent plate 4 and cannot rotate around the disconnecting half shaft 1, that is, the disconnecting half shaft 1 cannot rotate. At this time, the disconnecting operation of the circuit breaker 103 is locked, the circuit breaker 103 cannot be disconnected, and the reverse interlocking device of the grounding system works. That is, in the case that the cable chamber door 105 is opened, the grounding system always maintains the closed state.

[0066] After the primary circuit equipment of the switch cabinet is overhauled, the grounding system is disconnected after the cable chamber door is closed, and then the power is sent to operate, that is, the disconnecting operation of the circuit breaker and the direct-acting grounding switch is completed.

[0067] After the equipment is overhauled, the cable chamber door 105 is closed, the top rod 33 is moved into the cabinet, the boss of the top rod 33 pushes the reset spring 36 to compress, and the connecting head 39 moves into the cabinet with the top rod 35. The crank arm 17 rotates around the axis of the fourth stepped bolt 27 with the hole on the hanging plate 15 as the center, and the short connecting plate 12 moves upward under the force;

[0068] When the short connecting plate 12 moves upward, the transmission bent plate 11 moves, and the transmission bent plate 11 rotates around the center line of the shaft 10. The transmission pin 25 at the other end of the transmission bent plate 11 is inserted into the long circular hole of the long connecting plate 8, and the transmission bent plate 11 rotates to push the long connecting plate 8 to move linearly upward.

[0069] The transmission pin 25 pushes the long connecting plate 8 to move linearly upward, and the short pin 5 welded on the long connecting plate 8 pushes the interlocking bent plate 4 to rotate around the center of the shank of the first step bolt 6; the interlocking bent plate 4 is separated from the position below the limiting plate 3; when the disconnecting half shaft 1 is rotated due to the disconnecting operation, the limiting plate 3 moves with the disconnecting half shaft 1; the limiting plate 3 is not limited by the interlocking bent plate 4, that is, the disconnecting half shaft 1 can rotate normally; at this time, the circuit breaker 103 can be disconnected; that is, after the cable chamber door 105 is closed, the grounding system can be disconnected.

[0070] The reverse interlocking device of the gas insulation switch cabinet grounding system formed by the above scheme can be used when the gas insulation switch cabinet is maintained and repaired, can prevent the failure of the grounding system caused by the misoperation of the circuit breaker when the cable chamber door is opened after the line side grounding of the switch cabinet, and can increase the reliability and safety of the equipment, thereby avoiding the accidents caused by the live line side during the maintenance and repair, and protecting the life safety of the operators.

[0071] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A reverse locking device for a gas-insulated switchgear grounding system, characterized in that: It includes an elastic component, a transmission component, a first limiting component and a second limiting component; the elastic component abuts against the cable chamber door, and when the cable chamber is closed / opened, the elastic component can be squeezed or released; the transmission component is cooperatively connected with the elastic component, and the transmission component is driven to move due to the restoring force of the elastic component; the first limiting component is cooperatively connected with the transmission component, and the first limiting component is driven to move by the movement of the transmission component; the second limiting component is cooperatively connected with the first limiting component, and the movement of the first limiting component will drive the second limiting component to rotate, and when the first limiting component moves to the maximum limit, it can drive the second limiting component to limit / disengage with the circuit breaker, thereby locking / unlocking the circuit breaker; The second limiting assembly includes a limiting plate and an interlocking bent plate, the limiting plate being connected to the opening half-shaft of the internal part of the circuit breaker mechanism and being fastened by a fastener, when the opening half-shaft is rotated by the opening operation, the limiting plate follows the opening half-shaft, the interlocking bent plate is mounted on the mounting plate, the interlocking bent plate can rotate freely relative to the limiting plate, when the interlocking bent plate rotates to the bottom of the limiting plate, it can support the limiting plate, the limiting plate is restricted by the interlocking bent plate and cannot rotate around the opening half-shaft, that is, the opening half-shaft cannot rotate; the bottom of the interlocking bent plate is provided with an oblong hole, which is used to cooperate with the first limiting assembly; The first limiting assembly includes a short pin, a long connecting plate and a bolt; the short pin is fixed to the long connecting plate, and the short pin is inserted into the oblong hole of the interlocking bent plate, and the interlocking bent plate can rotate with the movement of the short pin; the long connecting plate is symmetrically provided with two oblong holes in the upper and lower parts, and bolts are respectively provided in the two oblong holes and assembled and connected with the mounting plate. When the bolts are tightened, the long connecting plate and the short pin move vertically up and down relative to the bolts, which can drive the interlocking bent plate connected to the short pin to rotate back and forth relative to the limiting plate, and limit / disengage with the limiting plate; The bottom of the long connecting plate is also provided with an oblong hole for connecting with the transmission assembly; The transmission assembly includes a bracket, a transmission bent plate, a shaft, a transmission pin, a short connecting plate, an anti-loosening block, a crank arm and a hanging plate; The bracket is installed under the lower frame plate and fixed with fasteners. The transmission bent plate is connected to the bracket through a shaft and is clamped at both ends with anti-loosening blocks. The transmission bent plate can rotate around the center line of the shaft. A transmission pin is welded at each end of the transmission bent plate, one of which is inserted into the oblong hole at the bottom of the long connecting plate, and the other is inserted into a hole at one end of the short connecting plate and is clamped with an anti-loosening block. The other end of the short connecting plate is connected to one end of the crank arm through a connecting piece, and the short connecting plate and the crank arm can rotate freely around the axis of the connecting piece; The center hole of the crank arm and the hanging plate are installed together with a connecting piece, and the crank arm can rotate freely around the axis of the connecting piece; the hanging plate is installed on the middle partition and is fixed.

2. A reverse locking device for a gas-insulated switchgear grounding system according to claim 1, characterized in that: An oblong hole is provided below the crank arm, which is used to connect with the elastic component.

3. A reverse locking device for a grounding system of a gas-insulated switchgear according to claim 2, characterized in that: The elastic component includes a connecting head, a push rod, a transmission sleeve, and a return spring; the connecting head is connected to the oblong hole at the lower part of the crank arm, and the connecting head and the push rod are cooperatively connected so that the connecting head and the push rod are relatively fixed; the transmission sleeve is arranged in the hole of the middle partition, and the return spring is arranged inside the transmission sleeve and sleeved on the push rod. The boss surface of the push rod is always pushed by the return spring, and the push rod protrudes from the middle partition in the natural state.

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