35kV armored metal alternating-current switch equipment circuit breaker interlocking mechanism and use method

Abstract

The invention relates to a 35kV armored metal alternating-current switch equipment circuit breaker interlocking mechanism and a use method thereof. The 35kV armored metal alternating-current switch equipment circuit breaker interlocking mechanism comprises a panel, a sliding plate and a dowel bar connected with the sliding plate through an adapter frame, the dowel bar is sleeved with a shifting piece fixedly connected with a connecting rod of a circuit breaker opening mechanism, and the dowel bar is fixedly provided with a limiting block for supporting the shifting piece; the panel is provided with a micro switch electrically connected with a closing loop of the circuit breaker, and the transfer frame is fixedly provided with a pressing plate matched with the micro switch; when the pressing plate moves to trigger the microswitch along with the sliding plate, the circuit breaker closing loop is switched on, and the circuit breaker opening mechanism connecting rod rotates to a closing position. The device has the beneficial effects that the shifting piece is driven to move through the movement of the sliding plate, so that the connecting rod of the circuit breaker opening mechanism is driven to rotate, opening is realized, meanwhile, the pressing plate is separated from the microswitch, an electric closing loop of the circuit breaker is cut off, and the purpose that the circuit breaker cannot be closed manually and electrically at the same time when an isolating switch is operated at the opening position of the mechanism is achieved; and the operation safety is ensured.

Description

Technical Field

[0001] This invention relates to the field of high-voltage switchgear technology, and in particular to a safety operation interlocking mechanism for circuit breakers, specifically a 35kV armored metal AC switchgear circuit breaker interlocking mechanism and its usage method. Background Technology

[0002] The 35kV high-voltage switchgear industry has developed rapidly in recent years, and users' demands for electrical safety are increasing. The initial intention of researching and manufacturing high-safety high-voltage switchgear was to meet the needs of development. This patented technology is mainly a latest research result on the circuit breaker safety operation interlocking mechanism of the 35kV armored fixed metal AC enclosed switchgear (hereinafter referred to as KGN-40.5 switchgear) of model KGN-40.5.

[0003] Switchgear design should meet the mandatory "five-prevention" requirements for electrical safety: preventing live push-pull of circuit breakers, preventing live operation of disconnect switches, preventing live closing of grounding switches, and preventing accidental entry into live compartments. The design of the KGN-40.5 switchgear also needs to meet these "five-prevention" requirements. Based on this, the switchgear interlocking design is carried out. The circuit breaker is the core component of the switchgear; its closing and opening operations determine whether the switchgear is energized. The rationality and reliability of the interlocking between the circuit breaker operating mechanism connected to the switchgear are crucial to the safety of operation and maintenance personnel.

[0004] The existing KGN-40.5 switchgear uses the traditional JSXGN-35 operating panel interlocking mechanism, which, together with the circuit breaker tripping linkage, adopts a rotary operating interlocking mechanism. The mechanism is unstable and prone to interlock failure. Furthermore, the traditional interlocking mechanism cannot prevent the circuit breaker from being electrically closed, making it difficult to meet the increasingly demanding electrical safety requirements and creating a safety vulnerability. Summary of the Invention

[0005] This invention addresses the shortcomings of existing technologies by providing an interlocking mechanism and method for a 35kV armored metal AC switchgear circuit breaker. This mechanism ensures that the circuit breaker remains in the open state during the operation of the isolating switch during switchgear maintenance and power supply, preventing it from being closed and thus providing stronger protection for electrical safety.

[0006] This invention is achieved through the following technical solution: providing a 35kV armored metal AC switchgear circuit breaker interlocking mechanism, including a fixed panel, a sliding plate slidably disposed between the panel and the operating shaft of the disconnecting switch, and a force transmission rod connected to the sliding plate via a transfer frame. A lever is sleeved on the force transmission rod and fixedly connected to the connecting rod of the circuit breaker tripping mechanism, and a limiting block supporting the lever is fixedly disposed on the force transmission rod. A micro switch electrically connected to the circuit breaker closing circuit is installed on the panel, and a pressure plate adapted to the micro switch is fixedly disposed on the transfer frame. The panel has an operating hole I opposite to the operating shaft of the disconnector switch, and the slide plate has an operating hole II located between the operating shaft of the disconnector switch and the operating hole I. When the slide plate moves to the point where the operating hole II is coaxial with the operating hole I and the operating shaft of the disconnector switch, the force transmission rod drives the circuit breaker tripping mechanism connecting rod to the tripping position, the pressure plate separates from the micro switch, and the circuit breaker closing circuit is cut off. When the pressure plate moves with the slide plate to trigger the micro switch, the circuit breaker closing circuit is connected, the operating hole II is offset from the operating hole I and the operating shaft of the disconnecting switch, and the circuit breaker tripping mechanism linkage rotates to the closing position.

[0007] This design utilizes the upward movement of the sliding plate to rotate the circuit breaker tripping mechanism linkage, thus tripping the circuit breaker. In the tripped state, the pressure plate separates from the micro switch, cutting off the circuit breaker closing circuit and preventing electric closing. Operating hole II is coaxial with operating hole I and the disconnector switch operating shaft, allowing operation of the disconnector switch operating shaft and ensuring operational safety. When the sliding plate moves downward, the limit block moves downward as well, and the circuit breaker tripping mechanism linkage resets under the action of its own torsion spring, causing the pressure plate to move down to trigger the micro switch, connecting the circuit breaker closing circuit. At this time, operating hole II is misaligned with operating hole I and the disconnector switch operating shaft, preventing operation of the disconnector switch operating shaft and ensuring operational safety.

[0008] As an optimization, the panel has upper and lower holes arranged along the sliding plate movement direction, as well as a through-hole connecting the upper and lower holes. The diameter of the upper and lower holes is larger than the width of the through-hole. A manual pull rod is installed on the panel. The manual pull rod includes a first shaft segment, a second shaft segment, and a third shaft segment arranged sequentially along the axial direction. The diameters of the first shaft segment, the second shaft segment, and the third shaft segment increase sequentially. The diameter of the first shaft segment is smaller than the width of the through-slot. The first shaft segment passes through the sliding plate, and the sliding plate has a through hole adapted to the first shaft segment. The diameter of the second shaft segment is adapted to the upper and lower holes. The third shaft segment is located on the side of the panel away from the sliding plate. In this optimized design, when the circuit breaker tripping mechanism linkage is in the tripped position, the upper hole restricts the downward movement of the manual pull rod, thereby preventing the sliding plate from moving downward and forming a lock, so that the circuit breaker cannot be manually closed. Pulling the manual pull rod outward allows the first shaft segment to move along the through-slot, thereby realizing the up and down movement of the manual pull rod. When the manual pull rod is inserted into the lower hole, the lower hole restricts the upward movement of the manual pull rod, keeping the circuit breaker tripping mechanism linkage in the closed state.

[0009] As an optimization, a retaining ring is fixed on the first shaft section, located on the side of the slide plate away from the second shaft section, and a compression spring is provided between the retaining ring and the slide plate. This optimization scheme, by setting the compression spring, makes it easier to insert the manual lever into the upper or lower hole when moving it, improving operating efficiency. At the same time, the compression spring provides an inward pulling force to the manual lever, preventing it from coming out of the upper or lower hole on its own, thus ensuring safety during use.

[0010] As an optimization, a programmable lock is also installed on the panel, with the lock lever located between the upper and lower holes. This optimization solution, by setting up the programmable lock, prevents the manual lever from moving up and down without using a key, thereby further improving the locking effect.

[0011] As an optimization, the adapter frame includes a connecting plate and a support rod that passes through and is fixed to the slide plate. The end of the support rod away from the slide plate is fixedly connected to the connecting plate. A support plate extending laterally is fixedly attached to the lower end of the connecting plate. The force transmission rod passes upward through the support plate, and a nut supported on the support plate is threadedly connected to the force transmission rod. This optimized adapter frame adopts a structure where the support rod and connecting plate are fixedly integrated, which not only ensures reliable force transmission but also facilitates weight reduction. By setting the nut to support the force transmission rod, the length of the force transmission rod passing upward through the support plate can be easily adjusted to meet different usage requirements.

[0012] As an optimization, the panel has several guide seats arranged along the sliding plate's movement direction on the side facing the disconnector switch's operating shaft. Each guide seat includes two opposing support blocks, forming a guide channel between the two opposing support blocks that fits the sliding plate. The two opposing support plates are fixed to the panel by bolts. This optimized solution provides guidance for the sliding plate's up-and-down movement by setting guide seats, thereby ensuring the reliability of the relative positions of operating hole II, operating hole I, and the disconnector switch's operating shaft.

[0013] This solution also provides a method for using the interlocking mechanism of a 35kV armored metal AC switchgear circuit breaker, including the following steps: When tripping is required, the program lock is unlocked, causing the locking rod to retract and no longer obstruct the manual lever. The manual lever is then pulled out, moving the second shaft section out of the lower hole, with the first shaft section positioned in the through joint. The manual lever is moved upward until the second shaft section aligns with the upper hole, and then inserted into the upper hole. As the manual lever moves upward, the first shaft section pushes the slide plate upward. As the slide plate moves upward, the force transmitted through the adapter and force transmission rod drives the circuit breaker tripping mechanism linkage to rotate, achieving tripping. When the slide plate moves upward until the second shaft section aligns with the upper hole, operating hole II and operating hole I, as well as the isolating switch operating shaft, become coaxial. Simultaneously, the pressure plate separates from the micro switch, cutting off the circuit breaker closing circuit. Then, the program lock is engaged, causing the locking rod to extend and obstruct the downward movement of the manual lever. When closing is required, the program lock is unlocked, causing the locking lever to retract and no longer obstruct the manual lever. The manual lever is then pulled out, causing the second shaft section to move out of the lower hole, with the first shaft section located in the through joint. The manual lever is moved downwards until the second shaft section is aligned with the lower hole, and then inserted, allowing the second shaft section to be inserted into the lower hole. As the manual lever moves downwards, the first shaft section pushes the slide plate downwards. When the slide plate moves downwards, the circuit breaker tripping mechanism linkage rotates and resets under the action of its own torsion spring, releasing the circuit breaker manual tripping lockout. When the slide plate moves downwards until the second shaft section is aligned with the lower hole, operating hole II is misaligned with operating hole I and the isolating switch operating shaft, preventing the handle from being inserted. When the slide plate moves downwards until the second shaft section is aligned with the lower hole, the pressure plate triggers the micro switch, connecting the circuit breaker closing circuit. Then, the program lock is engaged, causing the locking lever to extend and obstruct the upward movement of the manual lever.

[0014] The beneficial effects of this invention are as follows: by moving the sliding plate, the lever moves, thereby driving the circuit breaker tripping mechanism linkage to rotate, thus achieving tripping. At the same time, the pressure plate separates from the micro switch, cutting off the circuit breaker's electric closing circuit. This achieves the purpose that the circuit breaker cannot be closed manually or electrically at the same time when the isolating switch is operated in the open position of the mechanism, ensuring operational safety. Attached Figure Description

[0015] Figure 1 A schematic diagram showing the circuit breaker interlocking open state; Figure 2 for Figure 1 Side view; Figure 3 This is a schematic diagram of the circuit breaker's interlocking closed state. Figure 4 for Figure 3 Side view; Figure 5 This is a schematic diagram of the panel openings; Figure 6 This is a schematic diagram of the adapter frame structure; Figure 7 A schematic diagram of the circuit breaker interlocking process state I; Figure 8 for Figure 7 Side view; Figure 9 Schematic diagram of circuit breaker interlocking process state II; Figure 10 A schematic diagram of the circuit breaker interlocking process in state III; Figure 11 A schematic diagram of state IV of the circuit breaker interlocking process; Figure 12 for Figure 11 Side view; As shown in the figure: 1. Panel, 2. Slide plate, 3. Connecting plate, 4. Pressure plate, 5. Support block, 6. Support rod, 7. Manual pull rod, 8. Compression spring, 9. Retaining ring, 10. Cotter pin, 11. Micro switch, 12. Force transmission rod, 13. Paddle, 14. Program lock, 15. Frame, 16. Disconnecting switch operating shaft, 17. Circuit breaker tripping mechanism connecting rod, 18. Operating hole II, 19. Operating hole I, 20. Locking rod, 21. Upper hole, 22. Lower hole, 23. First shaft section, 24. Second shaft section, 25. Third shaft section, 26. Handle. Detailed Implementation

[0016] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0017] like Figure 1 The diagram illustrates a 35kV armored metal AC switchgear circuit breaker interlocking mechanism, comprising a fixed panel 1, a sliding plate 2 slidably positioned between the panel and the disconnector switch operating shaft 16, and a force transmission rod 12 connected to the sliding plate via an adapter frame. The panel is fixed to the switchgear frame 15, and the sliding plate slides vertically. The upper and lower ends of the force transmission rod are respectively provided with external threads. A lever 13, fixedly connected to the circuit breaker tripping mechanism connecting rod 17, is fitted onto the force transmission rod 12. A limiting block supporting the lever is fixedly mounted on the force transmission rod. In this embodiment, the limiting block is a nut threaded onto the force transmission rod. By rotating the nut, the angle of the lever can be adjusted. The length of the lever extends radially along the circuit breaker tripping mechanism connecting rod 17. When the lever rotates upward, it drives the circuit breaker tripping mechanism connecting rod 17 to rotate and trip. In this embodiment, the end of the lever furthest from the force transmission rod is fixedly connected to the circuit breaker tripping mechanism connecting rod 17 by bolts.

[0018] A micro switch 11 electrically connected to the circuit breaker closing circuit is installed on panel 1. A pressure plate 4 adapted to the micro switch 11 is fixed on the adapter frame. The micro switch is connected in series with the circuit breaker closing circuit. When the pressure plate is pressed to trigger the micro switch, the circuit breaker closing circuit is connected. When the pressure plate is separated from the micro switch, the circuit breaker closing circuit is disconnected.

[0019] The control panel has an operating hole I19 opposite to the operating shaft 16 of the disconnector switch. The slide plate 2 has an operating hole II18 located between the operating shaft 16 of the disconnector switch and the operating hole I19. The shape of the operating hole I19 is adapted to the operating handle 26, which is used to rotate the operating shaft 16 of the disconnector switch. When the slide plate moves to the point where the operating hole II18 is coaxial with the operating hole I19 and the operating shaft 16 of the disconnector switch, the pull rod drives the circuit breaker tripping mechanism connecting rod 17 to the tripping position, the pressure plate 4 separates from the micro switch 11, and the circuit breaker closing circuit is cut off. At this time, the handle 26 can be sleeved on the operating shaft 16 of the disconnector switch through the operating holes I19 and II18 for operation.

[0020] When the pressure plate 4 moves with the slide plate to trigger the micro switch, the circuit breaker closing circuit is connected, the operating hole II is misaligned with the operating hole I and the disconnecting switch operating shaft, and the circuit breaker tripping mechanism linkage rotates to the closing position. At this time, the slide plate blocks the insertion of the handle, making it impossible to operate the disconnecting switch operating shaft 16.

[0021] The panel is also provided with an upper hole 21 and a lower hole 22 arranged along the sliding direction, as well as a through slot connecting the upper hole 21 and the lower hole 22. The upper hole, the through slot and the lower hole are arranged in order from top to bottom. The diameters of the upper hole and the lower hole are equal and are both greater than the width of the through slot.

[0022] A manual pull rod 7 is mounted on the panel. The manual pull rod 7 includes a first shaft segment 23, a second shaft segment 24, and a third shaft segment 25 arranged sequentially along the axial direction. The diameters of the first shaft segment, the second shaft segment, and the third shaft segment increase sequentially. The diameter of the first shaft segment is smaller than the width of the through-slit, allowing it to move up and down along the through-slit. The first shaft segment 23 passes through the slide plate 2, which has a through hole adapted to the first shaft segment. The diameter of the second shaft segment is adapted to the upper and lower holes, but the second shaft segment cannot pass through the through hole on the slide plate. The third shaft segment is located on the side of the panel away from the slide plate. The diameter of the third shaft segment is larger than the diameters of the upper and lower holes, so it cannot be inserted. The third shaft segment can be used by the operator for gripping.

[0023] A retaining ring 9 is fixed on the first shaft section, located on the side of the slide plate away from the second shaft section. A compression spring 8 is provided between the retaining ring 9 and the slide plate 2. A cotter pin 10 is provided on the side of the retaining ring away from the compression spring, passing through the first shaft section. The compression spring is sleeved on the first shaft section, with one end of the spring pressing against the retaining ring and the other end pressing against the slide plate. The elastic force of the compression spring ensures the stability of the manual pull rod and prevents it from falling off.

[0024] The panel is also equipped with a program lock 14. The locking rod 20 of the program lock is located between the upper hole and the lower hole. When the locking rod 20 of the program lock is extended, it blocks the up and down movement of the manual lever.

[0025] During power outage maintenance, the operator inserts the program lock key to unlock the program lock, the locking lever shortens, and the manual pull rod in the closed position is pulled out. The compression spring is pressed and stressed, and at the same time, the locking effect of the manual pull rod is released. The first shaft of the manual pull rod is moved up along the through-slot of the operating mechanism panel to the position of the top hole. The manual pull rod is released. During the release of the compression spring, the manual pull rod passes through the top hole. The second shaft cannot pass through the through-slot, and the manual pull rod is locked in the open position. During the manual upward movement of the lever, the sliding plate, support rod, connecting plate, and force transmission rod drive the lever bolted to the circuit breaker tripping linkage to rotate counterclockwise, locking the circuit breaker tripping linkage and preventing manual closing of the circuit breaker. Simultaneously, the pressure plate bolted to the connecting plate moves upward, releasing the lock on the microswitch button, resetting the microswitch to its open position, cutting off the circuit breaker closing circuit, and preventing electric closing. When the sliding plate moves upward, the operating hole II on the sliding plate aligns with the isolating switch operating shaft, and the handle 26 is inserted to perform the isolating switch opening and closing operation. The program lock engages, the locking rod extends to prevent the manual lever from moving downward, the key is removed, and the key is inserted again after the isolating switch operation is completed to unlock. This structure completely achieves the goal of preventing manual and electric closing of the circuit breaker during the operation of the isolating switch.

[0026] During the power restoration process after maintenance, the circuit breaker interlocking mechanism of this invention operates as follows: After maintenance is completed and personnel have evacuated, the isolating switch operation is finished. Insert the program lock key into the program lock to unlock it. The locking rod shortens. Pull out the manual lever in the open position. The spring is pressed and stressed. At the same time, the locking effect of the thickened shaft using the manual lever is released. Move the first shaft section down along the through-slot of the operating mechanism panel to the lower hole position. Release the manual lever. During the release of the spring, the manual lever will push the second shaft section into the lower hole. The second shaft section cannot pass through the through-slot. Lock the manual lever in the open position. During the manual pull rod's downward movement, the slide plate, support rod, connecting plate, and force transmission rod all move downward, releasing the restriction on the downward movement of the lever. The lever rotates clockwise to reset under the action of the circuit breaker's own torsion spring, releasing the circuit breaker's manual tripping lockout. Simultaneously, the pressure plate bolted to the connecting plate moves downward, pressing the microswitch button. The microswitch reaches the closed position, connecting the circuit breaker's closing circuit, allowing for electric closing. The slide plate moves downward, causing the slide plate's operating hole II to deviate from the isolating switch's operating shaft. The slide plate blocks the insertion of the handle, preventing the isolating switch from opening or closing. Subsequently, the program lock key is turned, locking the program lock. The lock rod extends, blocking the manual pull rod's upward movement. The key is then removed, and the user waits for the circuit breaker to close and supply power.

[0027] The adapter frame in this embodiment includes a connecting plate 3 and a support rod 6 that is fixed on the slide plate 2. The connecting plate is arranged vertically, and the pressure plate is fixed to the connecting plate by bolts. The end of the support rod 6 away from the slide plate is fixed to the connecting plate 3. The lower end of the connecting plate is fixed with a support plate that extends horizontally. The force transmission rod 12 passes upward through the support plate, and a nut that supports the support plate is threadedly connected to the force transmission rod.

[0028] To prevent the slide from tilting when it moves up and down, the panel in this embodiment is provided with several guide seats arranged along the direction of slide movement on the side facing the operating shaft of the disconnect switch. The guide seats include two support blocks 5 arranged opposite each other, and a guide channel adapted to the slide is formed between the two opposite support blocks 5. The two opposite support plates are fixed to the panel by bolts.

[0029] This embodiment describes a method for using the interlocking mechanism of a 35kV armored metal AC switchgear circuit breaker, including the following steps: When tripping is required, unlock the program lock 14, causing the locking lever 20 of the program lock to retract and no longer obstruct the manual lever 7; pull the manual lever 7 to move the second shaft section 24 out of the lower hole 22, with the first shaft section 23 located in the through joint; move the manual lever upward until the second shaft section is aligned with the upper hole 21, and insert the manual lever so that the second shaft section 24 is inserted into the upper hole 21. During the upward movement of the manual lever, the first shaft section pushes the slide plate 2 upward. As the slide plate moves upward, the force is transmitted through the adapter and the force transmission rod. The force drives the circuit breaker tripping mechanism linkage 17 to rotate, thus tripping the circuit breaker. When the slide plate moves up to the second shaft section 24 and is opposite to the upper hole 21, the operating hole II 18 is coaxial with the operating hole I 19 and the disconnecting switch operating shaft 16. The handle is inserted through the operating hole I and the operating hole II to operate the disconnecting switch operating shaft. At the same time as the slide plate moves up, the pressure plate 4 separates from the micro switch 11, cutting off the circuit breaker closing circuit. Then the program lock is engaged, causing the locking rod 20 to extend and block the downward movement of the manual pull rod 7.

[0030] When closing is required, the program lock is unlocked, causing the locking lever to retract and no longer obstruct the manual lever. The manual lever is then pulled out, moving the second shaft section out of the lower hole, with the first shaft section positioned in the through joint. The manual lever is moved downwards until the second shaft section aligns with the lower hole, and then inserted, allowing the second shaft section to be inserted into the lower hole. As the manual lever moves downwards, the first shaft section pushes the slide plate downwards. When the slide plate moves downwards, the nut at the lower end of the force transmission rod loses its support for the circuit breaker tripping mechanism link. The circuit breaker tripping mechanism link rotates and resets under the action of its own torsion spring, releasing the circuit breaker manual tripping lockout. When the slide plate moves downwards until the second shaft section aligns with the lower hole, operating hole II is misaligned with operating hole I and the disconnector switch operating shaft, preventing the handle from being inserted and thus preventing the disconnector switch from being opened or closed. When the slide plate moves downwards until the second shaft section aligns with the lower hole, the pressure plate triggers the micro switch, connecting the circuit breaker closing circuit. Then, the program lock is engaged, causing the locking lever to extend and obstruct the upward movement of the manual lever.

[0031] The circuit breaker interlocking mechanism in this embodiment ensures that the circuit breaker remains in the open state during the operation of the disconnecting switch in the KGN-40.5 switchgear, preventing manual or electric closing. This interlocking mechanism fully complies with the "five-proof" technical requirements for electrical safety. Utilizing a mechanical interlocking mechanism, it completely solves the problems of unstable coordination, easy interlocking failure, and inability to prevent electric closing of the circuit breaker in traditional KGN-40.5 switchgear circuit breaker interlocking mechanisms. It is simple and reliable to operate, making electrical use safer.

[0032] Of course, the above description is not limited to the examples above. Technical features not described in this invention can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solutions of this invention and are not intended to limit this invention. This invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention do not depart from the spirit of this invention and should also fall within the scope of protection of the claims of this invention.

Claims

1. A circuit breaker interlocking mechanism for a 35kV armored metal AC switchgear, characterized in that: It includes a fixed panel (1), a sliding plate (2) slidably disposed between the panel and the disconnector switch operating shaft (16), and a force transmission rod (12) connected to the sliding plate via a transfer frame. A lever (13) fixedly connected to the circuit breaker tripping mechanism connecting rod (17) is sleeved on the force transmission rod (12), and a limiting block supporting the lever is fixedly disposed on the force transmission rod. A micro switch (11) electrically connected to the circuit breaker closing circuit is installed on the panel (1), and a pressure plate (4) adapted to the micro switch (11) is fixed on the adapter frame. The panel has an operating hole I (19) opposite to the operating shaft (16) of the disconnector switch, and the slide plate (2) has an operating hole II (18) located between the operating shaft (16) of the disconnector switch and the operating hole I (19). When the slide plate moves to the point where the operating hole II (18) is coaxial with the operating hole I (19) and the operating shaft (16) of the disconnector switch, the pull rod drives the circuit breaker tripping mechanism connecting rod (17) to the tripping position, the pressure plate (4) separates from the micro switch (11), and cuts off the circuit breaker closing circuit. When the pressure plate (4) moves with the slide plate to trigger the micro switch, the circuit breaker closing circuit is connected, the operating hole II is offset from the operating hole I and the operating shaft of the isolating switch, and the circuit breaker opening mechanism connecting rod rotates to the closing position.

2. The interlocking mechanism for a 35kV armored metal AC switchgear circuit breaker according to claim 1, characterized in that: The panel has an upper hole (21) and a lower hole (22) arranged along the sliding direction, and a through-hole connecting the upper hole (21) and the lower hole (22). The diameter of the upper hole and the lower hole is greater than the width of the through-hole. A manual pull rod (7) is provided on the panel. The manual pull rod (7) includes a first shaft section (23), a second shaft section (24), and a third shaft section (25) arranged sequentially along the axial direction. The diameters of the first shaft section, the second shaft section, and the third shaft section increase sequentially. The diameter of the first shaft section is smaller than the width of the through-slit. The first shaft section (23) passes through the slide plate (2). The slide plate has a through hole that matches the first shaft section. The diameter of the second shaft section matches the upper hole and the lower hole. The third shaft section is located on the side of the panel away from the slide plate.

3. The interlocking mechanism for a 35kV armored metal AC switchgear circuit breaker according to claim 2, characterized in that: A retaining ring (9) is fixed on the first shaft section and located on the side of the slide away from the second shaft section. A compression spring (8) is provided between the retaining ring (9) and the slide (2).

4. The interlocking mechanism for a 35kV armored metal AC switchgear circuit breaker according to claim 2, characterized in that: The panel is also equipped with a program lock (14), and the locking lever (20) of the program lock is located between the upper hole and the lower hole.

5. The interlocking mechanism for a 35kV armored metal AC switchgear circuit breaker according to claim 1, characterized in that: The adapter includes a connecting plate (3) and a support rod (6) that is fixed on the slide plate (2). The end of the support rod (6) away from the slide plate is fixed to the connecting plate (3). The lower end of the connecting plate is fixed with a support plate that extends laterally. The force transmission rod (12) passes through the support plate upward, and a nut that supports the support plate is threadedly connected to the force transmission rod.

6. The interlocking mechanism for a 35kV armored metal AC switchgear circuit breaker according to claim 1, characterized in that: The panel has several guide seats arranged along the sliding plate moving direction on the side facing the operating shaft of the disconnect switch. The guide seats include two opposing support blocks (5), and a guide channel adapted to the sliding plate is formed between the two opposing support blocks (5). The two opposing support plates are fixed to the panel by bolts.

7. The method of using the interlocking mechanism of a 35kV armored metal AC switchgear circuit breaker as described in any one of claims 3 to 5, characterized in that, Includes the following steps: When tripping is required, unlock the program lock (14) to retract the locking lever (20) of the program lock, thus removing its obstruction to the manual lever (7); pull the manual lever (7) to move the second shaft section (24) out of the lower hole (22), with the first shaft section (23) located in the through joint; move the manual lever upward until the second shaft section is opposite to the upper hole (21), and insert the manual lever so that the second shaft section (24) is inserted into the upper hole (21); during the upward movement of the manual lever, the first shaft section pushes the slide plate (2) upward, and the slide plate... When moving upward, the force transmitted through the transfer frame and the force transmission rod drives the circuit breaker tripping mechanism connecting rod (17) to rotate, thereby achieving tripping; when the slide plate moves upward to the second shaft section (24) and is opposite to the upper hole (21), the operating hole II (18) is coaxial with the operating hole I (19) and the disconnecting switch operating shaft (16); at the same time as the slide plate moves upward, the pressure plate (4) separates from the micro switch (11) and cuts off the circuit breaker closing circuit; then the program lock is locked, causing the locking rod (20) to extend and block the downward movement of the manual pull rod (7); When closing is required, the program lock is unlocked, causing the locking lever to retract and no longer obstruct the manual lever. The manual lever is then pulled out, causing the second shaft section to move out of the lower hole, with the first shaft section located in the through joint. The manual lever is moved downwards until the second shaft section is aligned with the lower hole, and then inserted, allowing the second shaft section to be inserted into the lower hole. As the manual lever moves downwards, the first shaft section pushes the slide plate downwards. When the slide plate moves downwards, the circuit breaker tripping mechanism linkage rotates and resets under the action of its own torsion spring, releasing the circuit breaker manual tripping lockout. When the slide plate moves downwards until the second shaft section is aligned with the lower hole, operating hole II is misaligned with operating hole I and the isolating switch operating shaft, preventing the handle from being inserted. When the slide plate moves downwards until the second shaft section is aligned with the lower hole, the pressure plate triggers the micro switch, connecting the circuit breaker closing circuit. Then, the program lock is engaged, causing the locking lever to extend and obstruct the upward movement of the manual lever.

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