Looped network type medium voltage switch cabinet program lock device

Abstract

The invention relates to the technical field of program lock devices, and particularly discloses a looped network type medium-voltage switch cabinet program lock device which comprises a shell, a lock rod assembly, a cam lock assembly, a welding shaft sleeve assembly, a transmission shaft, a torsion spring assembly, a microswitch and a roller. According to the device, a mechanical locking and electrical locking double-constraint design mode is adopted, two locking mechanisms are matched with each other and have a synergistic effect, and the problem that a single locking mode is prone to failure is effectively solved; mechanical locking realizes interlocking through pure mechanical structure transmission and is not interfered by external electrical signals; the interlocking effect is further enhanced by the electrical locking, double safety guarantee is formed, and the risk of safety accidents caused by locking failure is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of program lock device technology, specifically a program lock device for a ring network type medium voltage switchgear. Background Technology

[0002] In the operation of power systems, medium-voltage switchgear, as the core equipment for power transmission and distribution, is directly related to the stable operation of the entire power system and the personal safety of maintenance personnel. Among them, the interlocking of the operation of disconnecting switches and grounding switches is a key link in ensuring the safe operation of switchgear. If the operation sequence of the two is disordered, it can easily lead to serious safety accidents such as short circuits and arc flashovers, causing equipment damage or even personal injury.

[0003] Currently, most medium-voltage switchgear program interlocking devices on the market use a single interlocking method, resulting in poor interlocking reliability. Some devices rely solely on mechanical structures for interlocking, which are prone to component wear and jamming after long-term use, leading to interlocking failure. Other devices use electrical interlocking methods, but are susceptible to abnormal electrical signal transmission due to external voltage fluctuations, line faults, and other factors, making it impossible to reliably perform the interlocking function.

[0004] Meanwhile, existing programmable locking devices lack structural adaptability, making it difficult to flexibly match different types of medium-voltage switchgear and diverse application scenarios. In medium-voltage switchgear related to the new energy field, due to the special nature of the operating environment and operational requirements, existing devices often suffer from cumbersome operating procedures and imprecise interlocking logic, failing to effectively meet the high standards of safe operation requirements of new energy power systems. Furthermore, some devices lack effective reset mechanisms, and during unlocking, component misalignment can easily cause subsequent operational blockages, further reducing the reliability and ease of operation of the equipment. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a ring network type medium-voltage switchgear program lock device, which solves the problems mentioned in the background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a ring network type medium voltage switchgear program lock device, comprising a housing, a lock rod assembly, a cam lock assembly, a welded bushing assembly, a transmission shaft, a torsion spring assembly, a micro switch, and a roller; The cam lock assembly includes a first cam lock and a second cam lock; the welding bushing assembly includes a general welding bushing and a special welding bushing, the special welding bushing corresponding to grounding or isolation functions; the locking rod assembly includes a first locking shaft and a second locking shaft, and the first locking shaft and the second locking shaft have different specifications. The program lock device of the ring network medium-voltage switchgear is used to realize the interlocking of the isolating switch and the grounding switch of the ring network medium-voltage switchgear, and to regulate the operation process through the dual constraints of mechanical interlocking and electrical interlocking. Mechanical interlocking is achieved in the following way: After the operating mechanism reaches the target position (grounding closed position, grounding open position, isolation closed position, isolation open position), the corresponding first cam lock or second cam lock is rotated 105 degrees. The universal welded bushing drives the transmission shaft to rotate clockwise, driving the first lock shaft and the second lock shaft to move horizontally, locking the mechanism operating hole and the mechanism cam, and restricting the opening and closing operation. Electrical interlocking is achieved by the following method: a special welded bushing rotates in conjunction with the second cam lock, driving the roller to press against the micro switch, thus forming an electrical interlock; The torsion spring assembly includes a left-handed torsion spring and a right-handed torsion spring, which provide an auxiliary restoring force during unlocking to prevent the first locking shaft and the second locking shaft from being misaligned due to gravity or external force.

[0007] Preferably, the first locking shaft has a specification of 70mm or 72mm, and the second locking shaft has a specification of 90mm.

[0008] Preferably, the dedicated welding bushing assembly includes a grounding welding bushing and an isolation welding bushing, respectively corresponding to the grounding opening and closing interlocking scenario and the isolation opening and closing interlocking scenario, and is adapted and installed with the grounding locking fixing plate and the grounding locking dismounting fixing plate or the isolation locking fixing plate and the isolation locking dismounting fixing plate.

[0009] Preferably, the key can be removed after the first cam lock rotates 105 degrees clockwise, and the key can be removed after the second cam lock rotates 105 degrees counterclockwise. If the specified rotation angle is not reached, the key is restricted by the limiting cam and cannot be removed.

[0010] Preferably, the program lock device of the ring network medium voltage switchgear further includes an auxiliary switch assembly, which includes an ES1 auxiliary switch, an ES2 auxiliary switch, a DS1 auxiliary switch and a DS2 auxiliary switch; When the grounding switch is closed, the ES1 auxiliary switch changes from normally closed to normally open, while the ES2 auxiliary switch remains normally closed; when the grounding switch is opened, the ES1 auxiliary switch remains normally closed, while the ES2 auxiliary switch changes from normally closed to normally open. When the disconnecting switch is closed, the DS1 auxiliary switch changes from normally closed to normally open, while the DS2 auxiliary switch remains normally closed; when the disconnecting switch is opened, the DS1 auxiliary switch remains normally closed, while the DS2 auxiliary switch changes from normally closed to normally open.

[0011] Preferably, the interlocking logic between the disconnecting switch and the grounding switch is as follows: when the grounding switch (corresponding to the grounding switch operating shaft) is in the closed state, the disconnecting switch (corresponding to the disconnecting switch operating shaft) cannot be opened or closed; when the disconnecting switch is in the closed state, the grounding switch cannot be opened or closed. This interlocking is achieved by the first locking shaft and the second locking shaft blocking the corresponding operating shaft.

[0012] Preferably, the reset logic of the torsion spring assembly is as follows: when the grounding position is engaged or the isolation position is engaged and unlocked, the right-hand torsion spring provides an auxiliary reset force to drive the first locking shaft and the second locking shaft to reset; when the grounding position is disengaged or the isolation position is disengaged and unlocked, the left-hand torsion spring provides an auxiliary reset force to drive the first locking shaft and the second locking shaft to reset.

[0013] Preferably, the program lock device of the ring network medium voltage switchgear further includes a connecting plate, a bushing, a gasket, a flexible cylindrical pin, and a welded lock housing; the flexible cylindrical pin is used to fix the connection parts of each component, the gasket is set at the rotating mating part of the component, the welded lock housing is used to encapsulate the internal parts, the connecting plate is used for the linkage connection of the components, and the bushing is sleeved on the outside of the transmission shaft for the rotational support of the transmission shaft.

[0014] Preferably, the operation procedure of the program lock device for the ring network medium-voltage switchgear meets the following requirements: when the switch is in the open state, the corresponding key (such as key 1A2) can be removed after locking, and this key is used to unlock another associated switch; after the associated switch is closed, the key is locked and cannot be removed, and the key can only be removed after the associated switch is open; among them, the key is locked and cannot be removed when the load switch is closed, and the key cannot be removed after the grounding switch is closed, and the key can only be removed after the grounding switch is open.

[0015] This invention provides a ring network type medium-voltage switchgear program lock device, which has the following advantages: 1. Significantly improved interlocking reliability: This device adopts a dual-constraint design of mechanical interlocking and electrical interlocking. The two interlocking mechanisms work together and cooperate to effectively avoid the problem of easy failure of a single interlocking method. The mechanical interlocking achieves interlocking through pure mechanical structure transmission and is not affected by external electrical signals. The electrical interlocking further enhances the interlocking effect, forming a double safety guarantee and greatly reducing the risk of safety accidents caused by interlocking failure.

[0016] 2. Strong structural adaptability: The device optimizes the configuration of each core component through modular design, and can flexibly adapt to the corresponding component structure according to different interlocking scenarios. Among them, the special welded bushing can match the different interlocking requirements of grounding switch and disconnecting switch, and the locking rod assembly adopts locking shaft design of different specifications, which can adapt to the operating mechanism of different types of medium voltage switchgear, thus broadening the application range of the device, especially suitable for the special needs of the new energy field.

[0017] 3. Improved operational stability and convenience: The torsion spring assembly provides a stable auxiliary reset force during the device unlocking process, effectively preventing the locking rod assembly from shifting due to gravity or external forces, avoiding jamming problems in subsequent operations, and ensuring the smoothness of the operation process; at the same time, the device's interlocking logic design is rigorous, clearly defining the operation sequence constraints of each switch, standardizing the operation process of maintenance personnel, reducing the probability of misoperation, and improving operational convenience.

[0018] 4. Excellent operational durability: The device uses suitable connecting components and encapsulation structures to effectively protect internal core components, reducing wear and corrosion caused by the external environment. The auxiliary component design of each rotating mating part reduces frictional loss between components, extending the device's service life and enabling it to meet the requirements of long-term stable operation, thus reducing equipment maintenance costs. Attached Figure Description

[0019] Figure 1 This is a diagram showing the grounding lock closing state of the present invention; Figure 2 This is a diagram illustrating the tripping state of the grounding lock according to the present invention; Figure 3 This is a diagram showing the tripping state of the grounding lock according to the present invention; Figure 4 This is a diagram showing the grounding mechanism and locking / closing state of the present invention; Figure 5 This is a diagram showing the grounding mechanism and the tripping state of the present invention; Figure 6 This is a plan view of the isolation lock closing state of the present invention; Figure 7 This is a perspective view of the isolation lock in the closed state of the present invention; Figure 8 This is a plan view of the isolation lock tripping state of the present invention; Figure 9 This is a perspective view of the isolating interlock tripping state of the present invention; Figure 10 This is a diagram showing the isolation mechanism and the closed / closed state of the program lock in this invention. Figure 11 This is a diagram showing the isolation mechanism and the circuit breaker tripping state of the present invention; Figure 12 This is a connection diagram of ES1 and ES2 of the present invention; Figure 13 These are illustrations of the load switch and grounding switch of the present invention. Figure 14 This is an interlocking topology diagram showing the application of the program lock of the present invention in a medium-voltage ring network system. Detailed Implementation

[0020] The following will refer to the appendices in the embodiments of the present invention. Figures 1-14The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] In this embodiment, the present invention provides a technical solution: a ring network type medium-voltage switchgear program lock device, comprising: Housing and encapsulation components: including housing and welded locking housing 16. The housing is used for overall protection, and the welded locking housing 16 adopts a sealed design to encapsulate and protect the internal core components, reduce the wear and corrosion of the components by the external environment (such as dust and moisture), and extend the service life of the device.

[0022] Locking rod assembly: Composed of a first locking shaft 3 and a second locking shaft 4, with differentiated specifications to adapt to different interlocking scenarios. The first locking shaft 3 can be selected with a specification of 70mm or 72mm (70mm specification is suitable for isolation opening interlocking scenarios, and 72mm specification is suitable for grounding opening interlocking scenarios), while the second locking shaft 4 has a fixed specification of 90mm. It achieves blocking and unlocking of the operating shaft through horizontal movement and is the core actuator of mechanical interlocking.

[0023] Cam lock assembly: includes a first cam lock 13 and a second cam lock 19, whose rotation directions are different from the key removal logic; the first cam lock 13 needs to be rotated 105 degrees clockwise before the key can be removed, and the second cam lock 19 needs to be rotated 105 degrees counterclockwise before the key can be removed; if the specified rotation angle is not reached, the key will be mechanically limited by the limit cam 8 and cannot be removed, ensuring that the operation is in place.

[0024] Welded bushing assembly: divided into general-purpose welded bushing 6 and special-purpose welded bushing 17. The special-purpose welded bushing 17 is further subdivided into grounding welded bushing 171 and isolation welded bushing 172. The general-purpose welded bushing 6 is fixedly connected to the drive shaft 18 and is used to transmit rotational power. The grounding welded bushing 171 is adapted to grounding opening and closing interlocking scenarios and is adapted to be installed with the grounding lock fixing plate 101 and the grounding lock dismounting plate 201. The isolation welded bushing 172 is adapted to isolation opening and closing interlocking scenarios and is adapted to be installed with the isolation lock fixing plate 102 and the isolation lock dismounting plate 202.

[0025] Transmission and support components include a drive shaft 18, a connecting plate 5, a bushing 9, a gasket 14, and a flexible cylindrical pin 15. The drive shaft 18 is the core transmission component, and the bushing 9 is fitted on the outside. The bushing 9 provides stable rotational support for the drive shaft 18 through rolling friction. The connecting plate 5 is used to realize the linkage connection between various components to ensure the synchronization of power transmission. The flexible cylindrical pin 15 is used to fix the connection parts of various components to prevent loosening during operation. The gasket 14 is set at the rotating mating parts of the components to reduce frictional loss between components.

[0026] Locking and Reset Assembly: Includes micro switch 7, roller 10, and torsion spring assembly. The torsion spring assembly consists of left-hand torsion spring 11 and right-hand torsion spring 12, providing auxiliary reset force for the unlocking process; micro switch 7 and roller 10 cooperate to achieve electrical locking, and roller 10 is fixed to one end of rocker arm linked to dedicated welded bushing 17 to ensure reliable contact.

[0027] Auxiliary switch assembly: includes ES1 auxiliary switch, ES2 auxiliary switch, DS1 auxiliary switch and DS2 auxiliary switch, which are linked to the opening and closing status of the grounding switch and the disconnecting switch, respectively, to provide feedback on the switch status signal and enhance the reliability of electrical interlocking.

[0028] Assemble to form a complete device: The drive shaft 18 runs horizontally through the inside of the device, and its two ends are rotatably connected to the outer shell / welded lock shell 16 through bushings 9. The universal welded bushing 6 is fixedly sleeved in the middle of the drive shaft 18, and the special welded bushing 17 (grounded or isolated type) is fixed to the end of the drive shaft 18 near the second cam lock 19.

[0029] The first locking shaft 3 and the second locking shaft 4 are arranged in parallel below the transmission shaft 18. They are linked to the universal welded bushing 6 through the connecting plate 5. The two ends of the connecting plate 5 are respectively hinged to the top of the locking shaft and the extension arm of the universal welded bushing 6 through pins, so as to ensure that the transmission shaft 18 can drive the locking shaft to perform horizontal reciprocating motion when it rotates.

[0030] The first cam lock 13 and the second cam lock 19 are respectively installed in the corresponding mounting holes on the outer casing of the device, and their output shafts are fixedly connected to the end of the transmission shaft 18. The rotational power of the cam locks is directly transmitted to the transmission shaft 18.

[0031] The torsion spring assembly is fitted onto the mating part of the drive shaft 18 and the bushing 9. One end of the left-hand torsion spring 11 and the right-hand torsion spring 12 is fixed to the inner wall of the welded lock housing 16, and the other end is fixed to the limiting groove of the universal welded bushing 6, so as to ensure that a stable reset torque can be provided when unlocking.

[0032] The micro switch 7 is fixed inside the welded lock housing 16 by bolts. Its trigger end is set in correspondence with the roller 10. When the special welded bushing 17 rotates, the rocker arm drives the roller 10 to squeeze the trigger end of the micro switch 7, thereby realizing the switching of electrical signals.

[0033] The auxiliary switch assemblies (ES1, ES2, DS1, DS2) are installed on the side of the device and connected to the switch cabinet control system via wires. Their triggering mechanisms are linked with the operating shafts of the grounding switch and the disconnecting switch to provide synchronous feedback on the switch opening and closing status.

[0034] The flexible cylindrical pin 15 passes through the connection holes of each component to fix the cam lock to the drive shaft, the connecting plate to the lock shaft, and the special welded bushing to the drive shaft; the gasket 14 is placed on each rotating mating surface to ensure smooth rotation without jamming.

[0035] Mechanical interlocking process: Mechanical interlocking is achieved through a purely mechanical transmission structure, unaffected by external electrical signals, and is the core of ensuring interlocking reliability. Its specific implementation process is as follows: Preparation before operation: According to the operation requirements (opening or closing of grounding switch or disconnecting switch), operate the corresponding operating mechanism 20 to the target position (grounding closed position, grounding open position, disconnecting closed position, disconnecting open position) and ensure that the mechanism cam 8 is in the preset positioning position.

[0036] Cam lock operation: Select the corresponding cam lock for the target workstation and operate accordingly. If it is in the grounding or isolation position: Operate the first cam lock 13 and rotate it 105 degrees clockwise until the key can be removed (if it is not rotated to 105 degrees, the key is mechanically blocked by the limit cam 8 and cannot be removed). If it is a grounding or isolation position: Operate the second cam lock 19 and rotate it counterclockwise 105 degrees until the key can be pulled out (similarly, the key cannot be removed if the specified angle is not reached).

[0037] Power transmission and locking shaft action: The rotation of the cam lock drives the transmission shaft 18 to rotate clockwise, and the universal welded bushing 6 rotates synchronously with the transmission shaft 18. The rotational motion is converted into horizontal thrust through the connecting plate 5, which drives the first locking shaft 3 and the second locking shaft 4 to move in the horizontal direction.

[0038] Locking is achieved by the following: after the locking shaft moves, its end precisely blocks the operating shaft hole of the corresponding switch and simultaneously abuts against the limiting surface of the mechanism cam 8, preventing the operating handle from being inserted into the operating shaft hole and preventing the mechanism cam 8 from rotating, thereby forcibly restricting the opening and closing operation of the switch and achieving mechanical locking.

[0039] Electrical interlocking implementation process: Electrical interlocking, as a supplement to mechanical interlocking, further strengthens safety constraints through electrical signal interlocking. Its specific implementation process is as follows: Linked rotation: The special welding bushing 17 (grounded welding bushing 171 or isolation welding bushing 172) is synchronously linked with the second cam lock 19. When the second cam lock 19 rotates, the special welding bushing 17 rotates together with the transmission shaft 18.

[0040] Triggering the electrical switch: The rocker arm on the special welded bushing 17 drives the roller 10 to rotate synchronously. The roller 10 presses the trigger end of the micro switch 7, causing the contact state of the micro switch 7 to switch (normally closed to normally open or normally open to normally closed).

[0041] Electrical interlocking is formed: the status signal of microswitch 7 is transmitted to the switchgear control system, and the control system prohibits the output of operation commands for associated switches based on this signal. For example, when the grounding switch is closed, the electrical interlocking signal is triggered, and the control system refuses to execute the opening and closing commands of the isolating switch, forming a dual constraint at the electrical level.

[0042] The reset mechanism of the torsion spring assembly: The core function of the torsion spring assembly is to provide auxiliary reset force for the locking shafts during the unlocking process, preventing the first locking shaft 3 and the second locking shaft 4 from becoming misaligned due to gravity, external force, or vibration, thus ensuring smooth subsequent operations. Its reset logic is as follows: When the grounding is engaged or the isolation is engaged and then unlocked: the right-hand torsion spring 12 is compressed and stores elastic potential energy. When unlocking (the cam lock rotates in the opposite direction to reset), the right-hand torsion spring 12 releases elastic potential energy, generating a counterclockwise reset torque. This torque drives the transmission shaft 18 to rotate counterclockwise through the universal welded bushing 6, thereby driving the first locking shaft 3 and the second locking shaft 4 to reset horizontally and disengage from the obstruction of the operating shaft.

[0043] When the grounding and isolation positions are unlocked: the left-hand torsion spring 11 is compressed and stores elastic potential energy. When unlocking, the left-hand torsion spring 11 releases elastic potential energy, generating a clockwise reset torque, which drives the transmission shaft 18 to rotate clockwise, driving the lock shaft to reset horizontally, ensuring that the lock shaft returns to its initial position and is ready for the next operation.

[0044] Interlocking between disconnecting switch and grounding switch: The core function of this device is to achieve interlocking between the disconnecting switch and the grounding switch, that is, "when the grounding switch is closed, the disconnecting switch cannot be operated, and when the disconnecting switch is closed, the grounding switch cannot be operated." This logic is achieved through the coordination of mechanical structure and electrical signals, and the specific process is as follows: Interlocking in the closed state of the grounding switch: Grounding switch operation: Operate the grounding switch operating mechanism 20 to the closing position using the operating handle. At this time, rotate the first cam lock 13 clockwise by 105 degrees. Remove the key and activate the mechanical interlock: The first locking shaft 3 (72mm specification) and the second locking shaft 4 (90mm specification) move horizontally, blocking the operating shaft hole of the disconnecting switch and pressing against the mechanism cam 8 of the disconnecting switch, preventing the disconnecting switch operating handle from being inserted and the mechanism from rotating, thus forcibly restricting the opening and closing operation of the disconnecting switch.

[0045] Electrical interlocking: The grounded welded bushing 171 rotates with the drive shaft 18, causing the roller 10 to abut against the micro switch 7. At the same time, the auxiliary switch ES1 changes from normally closed to normally open, while ES2 remains normally closed. This electrical signal is transmitted to the control system, which locks the operating circuit of the disconnect switch. Even if forced operation is attempted, the drive mechanism of the disconnect switch cannot be triggered, thus forming a double interlock.

[0046] Interlocking in the closed state of the disconnector switch: Disconnecting switch operation: Operate the disconnecting switch operating mechanism 20 to the closing position using the operating handle, rotate the first cam lock 13 clockwise by 105 degrees, remove the key, and the mechanical interlock is activated: the first locking shaft 3 (70mm specification) and the second locking shaft 4 (90mm specification) move horizontally, blocking the operating shaft hole of the grounding switch and pressing against the mechanism cam 8 of the grounding switch, so that the grounding switch operating handle cannot be inserted, the mechanism cannot be rotated, and the opening and closing operation of the grounding switch is restricted.

[0047] Electrical interlocking coordination: The isolating welded bushing 172 rotates with the drive shaft 18, causing the roller 10 to abut against the micro switch 7. The auxiliary switch DS1 changes from normally closed to normally open, while DS2 remains normally closed. After receiving this signal, the control system locks the operating circuit of the grounding switch, prohibiting any operation commands from the grounding switch and ensuring the reliability of the interlocking.

[0048] Interlock release during tripped operation: Grounding switch tripping: Operate the grounding switch operating mechanism 20 to the tripping position, rotate the second cam lock 19105 degrees counterclockwise, remove the key, and the left-hand torsion spring 11 provides a reset force, driving the first locking shaft 3 and the second locking shaft 4 to reset and disengage from the blocking of the isolating switch operating shaft; at the same time, the auxiliary switch ES1 returns to normal closed, ES2 becomes normally open, the electrical interlock is released, and the isolating switch can be operated normally.

[0049] Disconnecting switch tripping: Operate the disconnecting switch operating mechanism 20 to the tripping position, rotate the second cam lock 19105 degrees counterclockwise, remove the key, the left-hand torsion spring 11 provides the reset force, the lock shaft resets, and the grounding switch operating shaft hole is unlocked; the auxiliary switch DS1 returns to normally closed, DS2 becomes normally open, the electrical interlock is released, and the grounding switch can be operated normally.

[0050] The working process of the auxiliary switch assembly: Auxiliary switch components (ES1, ES2, DS1, DS2) are used to provide real-time feedback on the opening and closing status of the switches, providing signal support for the switchgear control system. Their operation is strictly synchronized with the switch status. Grounding switch and related auxiliary switches: When the grounding switch is closed: the grounding operating shaft is linked to the auxiliary switch triggering mechanism to switch the ES1 auxiliary switch from the normally closed state to the normally open state, while the ES2 auxiliary switch remains in the normally closed state; this signal is used to inform the control system that "the grounding switch has been closed", triggering the isolating switch to lock out. When the grounding switch is tripped: the grounding operating shaft is reset, the ES1 auxiliary switch returns to the normally closed state, and the ES2 auxiliary switch switches from the normally closed state to the normally open state; this signal is used to inform the control system that "the grounding switch has been tripped" and to release the isolation switch lockout.

[0051] Related auxiliary switches of the disconnector switch: When the disconnector is closed: the disconnector operating shaft is linked to the auxiliary switch triggering mechanism to switch the DS1 auxiliary switch from the normally closed state to the normally open state, while the DS2 auxiliary switch remains in the normally closed state; this signal is used to inform the control system that "the disconnector has been closed" and triggers the grounding switch to lock. When the disconnector is tripped: the disconnector operating shaft is reset, the DS1 auxiliary switch returns to the normally closed state, and the DS2 auxiliary switch switches from the normally closed state to the normally open state; this signal is used to inform the control system that "the disconnector has tripped" and to release the grounding switch lockout.

[0052] The signal output of the auxiliary switch assembly adopts a passive contact design, which is compatible with different types of switch cabinet control systems, ensuring stable and reliable signal transmission that is not affected by voltage fluctuations.

[0053] The operation of this device strictly follows the principle of "key taking when opening the switch and key locking when closing the switch." The orderly operation of the associated switches is achieved through key transfer. The following example, using the interlocking operation of the G2-C load switch of STS1 and the G1-C grounding switch of STS2 in a ring network system, details the operation process: Initial state: The G2-C load switch of STS1 is in the open state, the G1-C grounding switch of STS2 is in the open state, all program lock keys are in the corresponding lock bodies, and all components of the device are in the initial reset state.

[0054] Unlocking the grounding switch operation: Operating the G2-C load switch of STS1: After confirming that the load switch is in the open state, rotate the corresponding program lock (first cam lock 13) 105 degrees clockwise to lock the load switch operation hole and mechanism cam 8. At this time, the key (1A2 key) can be pulled out (if the load switch is in the closed state, the key will be locked and cannot be taken out, forcibly prohibiting the unlocking operation). To unlock the STS2 G1-C grounding switch: Insert the removed 1A2 key into the corresponding program lock (second cam lock 19) of the STS2 G1-C grounding switch, and rotate it counterclockwise by 105 degrees to release the initial lock of the grounding switch. At this time, the key still cannot be removed. Grounding switch closing operation: After unlocking, insert the operating handle to close the grounding switch. After closing, the grounding welding bushing 171 drives the roller 10 to press against the micro switch 7, forming a mechanical and electrical double lock. The key (1A2 key) is locked in the lock body and cannot be pulled out. Grounding switch tripping and key retrieval: If it is necessary to trip the grounding switch, insert the operating handle to trip the grounding switch to the position. At this time, rotate the second cam lock 19 counterclockwise to reset, and rotate the left torsion spring 11 to drive the lock shaft to reset. The lock is released, and the 1A2 key can be pulled out. After the key is retrieved, the grounding switch returns to the initial tripped and locked state.

[0055] Example of interlocking operation between disconnecting switch and grounding switch: After the grounding switch is closed, the operation of the isolating switch is restricted: When the grounding switch is in the closed state, its corresponding first locking shaft 3 and second locking shaft 4 block the operating shaft hole of the isolating switch, and the auxiliary switch ES1 outputs a normally open signal, and the control system locks the operating circuit of the isolating switch. At this time, if you try to insert the operating handle of the isolating switch, it will be blocked by the locking shaft and the opening and closing operation cannot be performed. Grounding switch operation restriction after disconnecting switch is closed: When the disconnecting switch is in the closed state, the locking shaft blocks the grounding switch operating shaft hole, the auxiliary switch DS1 outputs a normally open signal, the control system locks the grounding switch operating circuit, and the grounding switch cannot be opened or closed. Interlock release operation: First, the switch in the closed state (grounding or isolation) must be opened to the correct position. Rotate the corresponding cam to reset the lock. The lock shaft will be reset under the action of the torsion spring. The auxiliary switch signal will be restored. Only after the interlock is released can the other switch be operated.

[0056] This device adopts a modular and standardized design, possessing strong structural adaptability and can be flexibly matched with different types of ring network medium-voltage switchgear and diverse application scenarios: Interlocking scenario adaptation: By replacing the dedicated welding bushing (grounding welding bushing 171 or isolation welding bushing 172), it can be quickly adapted to grounding opening and closing interlocking scenarios and isolation opening and closing interlocking scenarios. The dedicated welding bushing and the corresponding fixing plate (grounding lock closing / opening fixing plate, isolation lock closing / opening fixing plate) adopt a snap-fit ​​adaptation design, which is convenient for installation. Switch cabinet type compatibility: The first locking shaft 3 is available in two specifications: 70mm and 72mm. The second locking shaft 4 is fixed at 90mm. The corresponding locking shaft can be selected according to the spacing and size of the operating shafts of different switch cabinets without modifying the overall structure. Application Area Adaptation: The device uses high and low temperature resistant and vibration resistant materials (such as stainless steel locking shaft and engineering plastic shell), which are suitable for medium-voltage gas-filled ring network switchgear in new energy fields such as photovoltaic, wind power and energy storage, and can adapt to the special operating environment in new energy scenarios.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A ring network type medium-voltage switchgear program lock device, characterized in that, The system includes a housing, a locking rod assembly, a cam lock assembly, a welded bushing assembly, a drive shaft (18), a torsion spring assembly, a micro switch (7), and a roller (10); the cam lock assembly includes a first cam lock (13) and a second cam lock (19); the welded bushing assembly includes a general-purpose welded bushing (6) and a special welded bushing (17), the special welded bushing (17) corresponding to grounding or isolation functions; the locking rod assembly includes a first locking shaft (3) and a second locking shaft (4), and the first locking shaft (3) and the second locking shaft (4) have different specifications; the ring network medium-voltage switchgear program lock device is used to realize the interlocking of the isolating switch and the grounding switch of the ring network medium-voltage switchgear, and standardizes the operation process through mechanical interlocking and electrical interlocking dual constraints; the mechanical interlocking is achieved through the following The method of implementation is as follows: After the operating mechanism (20) reaches the target station, it rotates the corresponding first cam lock (13) or second cam lock (19) by 105 degrees. The universal welding bushing (6) drives the transmission shaft (18) to rotate clockwise, driving the first locking shaft (3) and the second locking shaft (4) to move horizontally, locking the mechanism operating hole and the mechanism cam (8), and restricting the opening and closing operation; the electrical interlock is achieved by the following method: the special welding bushing (17) rotates in linkage with the second cam lock (19), driving the roller (10) to abut against the micro switch (7) to form an electrical interlock; the torsion spring assembly includes a left-hand torsion spring (11) and a right-hand torsion spring (12), which provide auxiliary reset force when unlocking, preventing the first locking shaft (3) and the second locking shaft (4) from being misaligned due to gravity or external force.

2. The ring network type medium-voltage switchgear program lock device according to claim 1, characterized in that, The first locking shaft (3) has a specification of 70mm or 72mm, and the second locking shaft (4) has a specification of 90mm.

3. The ring network type medium-voltage switchgear program lock device according to claim 2, characterized in that, The dedicated welding bushing assembly includes a grounding welding bushing (171) and an isolation welding bushing (172), which correspond to the grounding opening and closing interlocking scenario and the isolation opening and closing interlocking scenario, respectively, and are adapted to be installed with the grounding locking fixing plate (101), the grounding locking dismount fixing plate (201) or the isolation locking fixing plate (102), the isolation locking dismount fixing plate (202).

4. A ring network type medium-voltage switchgear program lock device according to claim 3, characterized in that, The key can be pulled out after the first cam lock (13) is rotated 105 degrees clockwise, and the key can be pulled out after the second cam lock (19) is rotated 105 degrees counterclockwise. When the specified rotation angle is not reached, the key is restricted by the limiting cam (8) and cannot be pulled out.

5. A ring network type medium-voltage switchgear program lock device according to claim 4, characterized in that, The ring network medium-voltage switchgear program lock device also includes auxiliary switch components, which include ES1 auxiliary switch, ES2 auxiliary switch, DS1 auxiliary switch and DS2 auxiliary switch; when the grounding switch is closed, ES1 auxiliary switch changes from normally closed to normally open, and ES2 auxiliary switch remains normally closed; when the grounding switch is opened, ES1 auxiliary switch remains normally closed, and ES2 auxiliary switch changes from normally closed to normally open; when the disconnecting switch is closed, DS1 auxiliary switch changes from normally closed to normally open, and DS2 auxiliary switch remains normally closed; when the disconnecting switch is opened, DS1 auxiliary switch remains normally closed, and DS2 auxiliary switch changes from normally closed to normally open.

6. A ring network type medium-voltage switchgear program lock device according to claim 5, characterized in that, The interlocking logic between the disconnecting switch and the grounding switch is as follows: when the grounding switch is in the closed state, the disconnecting switch cannot perform the opening and closing operation; when the disconnecting switch is in the closed state, the grounding switch cannot perform the opening and closing operation. This interlocking is achieved by blocking the corresponding operating shafts through the first locking shaft (3) and the second locking shaft (4).

7. A ring network type medium-voltage switchgear program lock device according to claim 6, characterized in that, The reset logic of the torsion spring assembly is as follows: when the grounding position is closed and the isolation position is unlocked, the right-hand torsion spring (12) provides an auxiliary reset force to drive the first locking shaft (3) and the second locking shaft (4) to reset; when the grounding position is open and the isolation position is unlocked, the left-hand torsion spring (11) provides an auxiliary reset force to drive the first locking shaft (3) and the second locking shaft (4) to reset.

8. A ring network type medium-voltage switchgear program lock device according to claim 7, characterized in that, The program lock device of the ring network medium voltage switchgear also includes a connecting plate (5), a bushing (9), a gasket (14), an elastic cylindrical pin (15), and a welded lock shell (16); the elastic cylindrical pin (15) is used to fix the connection parts of each component, the gasket (14) is set at the rotating mating part of the component, the welded lock shell (16) is used to encapsulate the internal parts, the connecting plate (5) is used for the linkage connection of the components, and the bushing (9) is sleeved on the outside of the transmission shaft (18) for the rotational support of the transmission shaft (18).

9. A ring network type medium-voltage switchgear program lock device according to claim 8, characterized in that, The operation procedure of the program lock device in the ring network medium-voltage switchgear is as follows: when the switch is in the open state, the corresponding key can be removed after locking, and this key is used to unlock another associated switch; after the associated switch is closed, the key is locked and cannot be removed, and the key can only be removed after the associated switch is open; when the load switch is closed, the key is locked and cannot be removed, and after the grounding switch is closed, the key cannot be removed, and the key can only be removed after the grounding switch is open.

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