Interlocking device for preventing misoperation of gas-insulated switchgear

Abstract

The utility model discloses an interlocking device for preventing misoperation of a gas-insulated switchgear, which comprises a three-station interlocking device, a circuit breaker interlocking device and a compartment door plate interlocking device which are mutually combined and used to play a role, and the interlocking function is realized by utilizing the interlocking principle of a mechanical program lock. On the basis of not changing the structure and action principle of the original cabinet body, reliable interlocking and five-prevention required functions can be realized, the structure is simple, the installation and debugging operation is convenient, the interlocking is stable, safe and reliable, manual or electric misoperation is fundamentally limited, personnel are effectively prevented from entering an electrified interval by mistake, and after reliable grounding of the gas-insulated switchgear is completed, the safety of the gas-insulated switchgear is ensured. By means of the technical scheme, it can be guaranteed that personnel safely enter a compartment to maintain and check the gas-insulated switchgear, unlocking logics between the key K1 and the key K2 are reasonably distributed, the keys K1 and K2 are linked with each other, and the logic relation of key unlocking is simplified.

Description

Technical Field

[0001] This utility model relates to the field of interlocking safety devices for gas-filled cabinets, specifically an interlocking device for preventing misoperation of gas-filled cabinets. Background Technology

[0002] Gas-insulated switchgear (Gas-insulated switchgear) is one of the main equipment used in power grid transmission and transformation, and its safety during operation is particularly important. In general, the disconnecting switch, circuit breaker switch and grounding switch in the air-insulated switchgear are installed in the respective compartments of the switchgear. There are no restrictions on the sealing conditions between the mechanism and moving parts, which can form a good interlocking function.

[0003] However, the gas-insulated switchgear currently in use generally adopts a direct-acting three-position (closing, opening, and grounding) mechanism operated from the front of the cabinet. The isolating switch and the grounding switch are integrated into a single structure, and the opening and closing of the isolating switch and the grounding switch are achieved by the movement of the screw driven by the sprocket. Due to the limitations of sealed components such as the gas box, and the fact that the cabinet structure generally adopts a rear-maintenance scheme with the cable compartment (isolation compartment) door opening at the back, and the compartment door is fixed with conventional bolts, it cannot meet the requirements of the "five-proof" standard for gas-insulated switchgear to prevent accidental opening and closing of circuit breakers and to prevent accidental entry into energized compartments.

[0004] For example, Chinese Patent CN118899178A discloses a high-reliability interlocking device for a gas-insulated switchgear, including a circuit breaker mechanism, a three-position mechanism, and a cable compartment located below the three-position mechanism. The cable compartment is equipped with a sliding cable compartment door. It also includes two circuit breaker interlocking components, one and two, to interlock the circuit breaker mechanism and the three-position mechanism, ensuring that the circuit breaker can only close when the disconnecting switch is closed, and the disconnecting switch cannot open when the circuit breaker is closed. Furthermore, it includes a cable compartment door interlocking mechanism, comprising three components, one, two, and three, thereby achieving interlocking between the three-position mechanism and the cable compartment door. This allows the cable compartment door to be opened for maintenance when the grounding switch is closed, but prevents the grounding switch from opening and power supply operations if the cable compartment door is not closed, thus improving the safety of the product.

[0005] For example, Chinese Patent Publication No. CN119230313A discloses a novel composite interlocking device for a CGIS double busbar gas-insulated switchgear, including a circuit breaker mechanism, a first three-position mechanism and a second three-position mechanism, a control interlocking device and an interlocking device. The circuit breaker operating mechanism has a circuit breaker interlocking plate for disconnecting the circuit breaker mechanism; the first three-position mechanism and the second three-position mechanism have corresponding valve opening pins, which can be moved to the left or right to open the valves of the corresponding first three-position mechanism or second three-position mechanism; the valve opening pins of the first three-position mechanism and the second three-position mechanism are connected to the circuit breaker interlocking plate through the control interlocking device; the interlocking device is connected so that one of the valve opening pins of the first three-position mechanism and the second three-position mechanism slides while the other is locked by the interlocking device, thereby preventing the valve opening pins of the first three-position mechanism and the second three-position mechanism from operating simultaneously.

[0006] Chinese Patent Publication No. CN212907531U discloses a dual-operating-axis three-station mechanism for an inflatable cabinet and its interlocking device. Its features include a support member, a guide plate, a lead screw, and a limiting rod 1 disposed between mounting plates 2 and 3. One end of the lead screw is connected to the shaft of a transmission gear 1, and the lead screw cooperates with a slider. Transmission gear 1 meshes with transmission gear 2, and the shaft of transmission gear 2 is connected to mounting plate 2. An operating handle passes through mounting plate 1 and connects to the shaft of transmission gear 2. An interlocking plate is provided on the outer side of mounting plate 1. The interlocking plate has a hook for actuating the left leaf spring during movement and a limiting pin for actuating the right leaf spring, as well as a hole for cooperating with the interlocking rod. A movable handle shaft is fixed to the outer side of the interlocking plate. Compared with the prior art, this utility model adopts dual-operating-axis operation, with good interlocking, linkage, and anti-opening effects, strong interlocking logic, and convenient and reliable locking, unlocking, and switching operations of the operating mechanism.

[0007] For example, Chinese Patent No. CN211294946U discloses a three-lock, two-key interlocking device for a ring main unit, including a program lock, an indicator shaft, a tripping shaft, and a closing shaft disposed within an outer cover. The program lock is provided with a linkage plate, the linkage plate is provided with a limit shaft, the indicator shaft is provided with a positioning plate that cooperates with the limit shaft, the closing shaft is provided with a limit plate that cooperates with the linkage plate, the closing shaft is provided with a limit rod, and the tripping shaft is provided with a groove that matches the limit rod. This device has good operational stability and safety.

[0008] In summary, existing gas-insulated switchgear interlocking safety devices have many drawbacks, which are summarized as follows:

[0009] ① Due to the limitations of the aforementioned high-current gas-insulated switchgear structure, there is no effective interlocking function between the three-position operating mechanism and the compartment. Personnel can enter the compartment for maintenance and operation regardless of whether the grounding switch is in the closed position. Furthermore, the three-position mechanism can be operated at any time. It should be noted that the aforementioned high-current gas-insulated switchgear is a gas-insulated high-voltage switchgear product with a rated current of 1250A or higher, and its main application is for high-current gas-insulated switchgear used in power grid transmission and transformation. It is not the compact gas-insulated ring type described in the aforementioned comparative documents CN118899178A or CN211294946U, etc. Network cabinets (generally with current below 1250A) and compact gas-insulated ring main units are structurally more compact than high-current gas-insulated cabinets. The three working positions, circuit breakers, and compartment doors are on the same mounting surface with shorter relative spacing, making them easier to implement mechanical interlocking. In contrast, the size and layout of high-current gas-insulated cabinets are based on the space requirements for transformer and cable installation, as well as the requirements for high-current heat dissipation, requiring more space, resulting in larger structural dimensions and a more dispersed layout. Therefore, they should not be confused with the cabinet types mentioned in the aforementioned comparative documents CN118899178A or CN211294946U.

[0010] ②At the same time, there is no interlocking device between the circuit breaker mechanism and the compartment door, which makes it easy for electrical misoperation and electric shock accidents to occur during maintenance. The safety of the switchgear is low, and the safety of maintenance personnel is low.

[0011] ③ It cannot meet the requirements of the "five protections" of gas-insulated switchgear, namely, preventing accidental opening and closing of circuit breakers and preventing accidental entry into energized compartments;

[0012] ④ Currently, most gas-insulated high-voltage switchgear products in China (rated current above 1250A) lack mechanical interlocking function for the compartment doors. If the cabinet and switch structure are redesigned, the required cost and design workload are large. It is impossible to complete the redesign of the existing cabinet structure and the on-site cabinet rectification in a short period of time, resulting in a lot of extra work.

[0013] ⑤ The existing interlocking logic is not rigorous, and it is easy for other mechanisms to be able to operate even when the interlocking is in progress, which poses a significant safety hazard. Utility Model Content

[0014] In view of the shortcomings of the existing technology, this utility model provides an interlocking device for preventing misoperation of gas-filled cabinets, so as to solve the above problems.

[0015] To achieve the above objectives, this utility model is implemented through the following technical solution.

[0016] An interlocking device for preventing misoperation of a gas-insulated switchgear includes a three-position interlocking device, a circuit breaker interlocking device, and a compartment door interlocking device, all three being installed at corresponding positions on the gas-insulated switchgear.

[0017] The three-position interlocking device includes an operation panel, a three-position mechanical lock, and a three-position travel baffle. The operation panel is provided with a handle operation hole, the three-position mechanical lock is fixed on the operation panel, and the three-position mechanical lock is connected to the three-position travel baffle.

[0018] The circuit breaker interlocking device includes a support plate, a limit baffle, a circuit breaker travel baffle, and a circuit breaker mechanical lock. The circuit breaker mechanical lock is mounted on the support plate, and one end of the limit baffle can move on the support plate.

[0019] The compartment door interlocking device includes a fixed plate, a lock box, a compartment mechanical lock, and an automatic limit device. Both the compartment mechanical lock and the automatic limit device are housed within the lock box and correspond to each other. The fixed plate has fixing holes.

[0020] While the three-lock, two-key configuration has been documented in existing technologies, none is fully compatible with the gas-insulated switchgear used in this solution. Due to the unique structure of the high-current gas-insulated switchgear, a combination of a three-position interlocking device, a circuit breaker interlocking device, and a compartment door interlocking device allows for overall interlocking optimization without altering the original switchgear structure. Utilizing the mechanical program lock interlocking principle, the interlocking function is achieved. The overall design achieves reliable interlocking and meets the "five-proof" requirements without changing the original switchgear structure and operating principle. The structure is simple, installation, debugging, and operation are convenient, the interlocking is stable, and safety and reliability are guaranteed. It fundamentally limits manual or electric misoperation and effectively prevents personnel from accidentally entering energized compartments. After the gas-insulated switchgear is reliably grounded, personnel can safely enter the compartment for maintenance and inspection. The unlocking logic between keys K1 and K2 is rationally allocated, ensuring a seamless connection and simplifying the key unlocking logic.

[0021] Preferably, the operation panel is fixed on the direct-acting three-position operation mechanism of the gas filling cabinet, and the three-position interlock device further includes a three-position limit switch, which is fixed on the operation panel.

[0022] Preferably, the three-position mechanical lock is provided with a three-position locking tongue, one end of which is connected to the three-position travel baffle, and the other end corresponds to the position of the handle operation hole.

[0023] Preferably, the three-position interlocking device further includes a position indicator panel and a three-position drive shaft. One side of the three-position drive shaft is connected to the direct-acting three-position operating mechanism of the gas filling cabinet, and the other side is connected to the position indicator panel.

[0024] Preferably, the position indicator panel is provided with a group of status indicators, which consists of three groups: the disconnect switch closed position, the disconnect switch open position, and the grounding switch closed position. The operation panel is provided with an indicator hole, through which the group of status indicators can be exposed.

[0025] Preferably, the position indicator disc is provided with an indicator groove, the shape of which is adapted to the three-position travel baffle.

[0026] Preferably, the three-position limit switch is electrically connected to the three-position motor in the direct-acting three-position operating mechanism of the gas filling cabinet.

[0027] Preferably, the support plate is fixed on the circuit breaker operating mechanism of the gas-filled switchgear, and the circuit breaker interlocking device further includes a circuit breaker limit switch, which is fixed on the support plate and its position corresponds to the circuit breaker limit baffle.

[0028] Preferably, one end of the limiting baffle is provided with a pressure block, and the pressure block is connected to the connecting rod of the circuit breaker operating mechanism.

[0029] Preferably, the support plate is provided with a limiting stop hole, and the circuit breaker mechanical lock is provided with a circuit breaker locking tongue. The shape of the circuit breaker locking tongue is adapted to the limiting stop hole. One end of the circuit breaker locking tongue corresponds to the position of the limiting stop hole, and the other end is connected to the circuit breaker travel baffle.

[0030] Preferably, the circuit breaker interlocking device further includes a mounting plate and a sliding plate. The mounting plate is fixed on the support plate, and the mounting plate has a mounting hole groove on one side corresponding to the limiting baffle that matches the limiting baffle hole. The sliding plate is slidably connected to the mounting plate.

[0031] Preferably, the skateboard is provided with a handle, and the position where the handle connects to the mounting plate is a cuboid with arcs on both sides, which can be moved or fixed in a corresponding position to the mounting plate.

[0032] Preferably, both the mounting plate and the sliding plate are provided with switch slots, and their shapes are adapted to the opening and closing buttons of the circuit breaker operating mechanism.

[0033] Preferably, the circuit breaker limit switch is electrically connected to the circuit breaker motor in the circuit breaker operating mechanism of the gas-filled cabinet.

[0034] Preferably, the compartment mechanical lock is provided with a compartment lock tongue, and the compartment lock tongue corresponds to the position of the fixing hole.

[0035] Preferably, the automatic limiting device includes a limiting main board and a limiting slide plate. The limiting slide plate is movably mounted on the limiting main board, and the limiting slide plate is connected to the limiting main board via a spring. The position of the limiting slide plate corresponds to the position of the fixed plate.

[0036] Preferably, the fixing plate is installed inside the gas filling cabinet.

[0037] Preferably, the lock cylinder of the three-position mechanical lock is adapted to one of the lock cylinders of the circuit breaker mechanical lock, and the other lock cylinder of the circuit breaker mechanical lock is adapted to the lock cylinder of the compartment mechanical lock.

[0038] Preferably, the circuit breaker mechanical lock is a double-core mechanical lock, while the three-position mechanical lock and the compartment mechanical lock are both single-core mechanical locks. This ensures that the circuit breaker mechanical lock can only be unlocked when key K1 is removed, and key K2 can be operated and removed for unlocking the compartment mechanical lock. This facilitates on-site operators to perform operations in sequence and prevents key K2 from being accidentally removed from the circuit breaker mechanical lock when the three-position operating mechanism is not grounded and locked, thereby improving production and assembly efficiency.

[0039] Preferably, the lock cylinders on the three-position mechanical lock and the circuit breaker mechanical lock can also be matched one-to-one with the lock cylinders on the compartment mechanical lock.

[0040] Preferably, the compartment mechanical lock is a double-core mechanical lock, while the three-position mechanical lock and the circuit breaker mechanical lock are both single-core mechanical locks. This ensures that the compartment door can only be unlocked and opened when the direct-acting three-position operating mechanism is in the closed position of the grounding switch and the circuit breaker operating mechanism is in the closed position and both are in the locked state, preventing personnel from accidentally entering the energized compartment when the grounding switch is not closed. Conversely, the keys K1 and K2 on the compartment mechanical lock can only be removed after the compartment door is closed to unlock the direct-acting three-position operating mechanism and the circuit breaker operating mechanism.

[0041] Compared to existing technologies, this utility model discloses an interlocking device for preventing misoperation of gas-filled switchgear, including a three-position interlocking device, a circuit breaker interlocking device, and a compartment door interlocking device. These three devices work together to achieve their intended function.

[0042] ① Although the form of three locks and two keys has been recorded in the existing technology, none of them can be fully adapted to the gas-filled switchgear of this solution. Due to the special structure of the high-current gas-filled switchgear, the overall interlocking optimization can be carried out without changing the original gas-filled switchgear structure by combining the three-position interlocking device, the circuit breaker interlocking device, and the compartment door interlocking device.

[0043] ② When the circuit breaker mechanical lock is a double-core mechanical lock and both the three-position mechanical lock and the compartment mechanical lock are single-core mechanical locks, the circuit breaker mechanical lock can only be unlocked when key K1 is removed, and key K2 can be operated and removed for unlocking the compartment mechanical lock. This facilitates on-site operators to operate in sequence and prevents key K2 from being accidentally removed from the circuit breaker mechanical lock when the three-position operating mechanism is not grounded and locked, thus improving production and assembly efficiency.

[0044] ③ Utilizing the interlocking principle of mechanical program locks, the interlocking function is realized. The whole system can achieve reliable interlocking and the "five protections" requirements without changing the original cabinet structure and operating principle. The structure is simple, easy to install, debug and operate, the interlocking is stable and safe and reliable. It fundamentally limits human error in manual or electric operation and effectively prevents personnel from accidentally entering the live compartment. After the gas cabinet is reliably grounded, it can ensure that personnel can safely enter the compartment to maintain and inspect the gas cabinet.

[0045] ④ Reasonably allocate the unlocking logic between key K1 and key K2 to make each step interlocked and simplify the key unlocking logic;

[0046] ⑤ When the compartment mechanical lock is a double-core mechanical lock and both the three-position mechanical lock and the circuit breaker mechanical lock are single-core mechanical locks, the compartment door can only be unlocked and opened when the direct-acting three-position operating mechanism is in the closed position of the grounding switch and the circuit breaker operating mechanism is in the closed position and in the locked state, preventing personnel from accidentally entering the energized compartment when the grounding switch is not closed; conversely, the keys K1 and K2 on the compartment mechanical lock can only be pulled out after the compartment door is closed, in order to unlock the direct-acting three-position operating mechanism and the circuit breaker operating mechanism. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the interlocking device for preventing misoperation of a gas-filled cabinet according to this utility model;

[0048] Figure 2 This is an exploded view of the structure of the three-station interlocking device of this utility model;

[0049] Figure 3 This is a schematic diagram of the position indicator disk of this utility model;

[0050] Figure 4 This is a schematic diagram of the structure and working state of the three-position interlocking device of this utility model;

[0051] Figure 5 This is a schematic diagram of the structure and working state of the three-position interlocking device of this utility model;

[0052] Figure 6This is an exploded view of the structure of the circuit breaker interlocking device of this utility model;

[0053] Figure 7 This is a schematic diagram of the circuit breaker interlocking device of this utility model;

[0054] Figure 8 This is a schematic diagram of the structural assembly of the circuit breaker interlocking device of this utility model;

[0055] Figure 9 This is a schematic diagram of the working state of the circuit breaker interlocking device of this utility model;

[0056] Figure 10 This is a schematic diagram of the working state of the circuit breaker interlocking device of this utility model;

[0057] Figure 11 This is an exploded view of the structure of the compartment door interlocking device of this utility model;

[0058] Figure 12 This is a schematic diagram showing the structure of the interlocking device for the compartment door panel of this utility model when closed.

[0059] Figure 13 This is a schematic diagram showing the structure of the interlocking device for the compartment door panel of this utility model when opened.

[0060] Figure 14 This is a schematic diagram of the structural working state of the compartment door interlocking device of this utility model;

[0061] Figure 15 This is a schematic diagram of the three-station secondary control circuit of this utility model;

[0062] Figure 16 This is a schematic diagram of the secondary electric circuit of the circuit breaker of this utility model;

[0063] Figure 17 This is a schematic diagram of the interlocking device for preventing misoperation of the gas-filled cabinet in Embodiment 2 of this utility model;

[0064] Figure 18 This is an exploded view of the three-station interlocking device in Embodiment 2 of this utility model;

[0065] Figure 19 This is a schematic diagram of the position indicator disk in Embodiment 2 of this utility model;

[0066] Figure 20 This is a schematic diagram of the structural working state of the three-station interlocking device in Embodiment 2 of this utility model;

[0067] Figure 21 This is a schematic diagram of the structural working state of the three-station interlocking device in Embodiment 2 of this utility model;

[0068] Figure 22 This is an exploded view of the structure of the circuit breaker interlocking device in Embodiment 2 of this utility model;

[0069] Figure 23 This is a schematic diagram of the circuit breaker interlocking device in Embodiment 2 of this utility model;

[0070] Figure 24 This is a schematic diagram of the structural assembly of the circuit breaker interlock device in Embodiment 2 of this utility model;

[0071] Figure 25 This is a schematic diagram of the working state of the circuit breaker interlock device in Embodiment 2 of this utility model;

[0072] Figure 26 This is a schematic diagram of the working state of the circuit breaker interlock device in Embodiment 2 of this utility model;

[0073] Figure 27 This is an exploded view of the structure of the compartment door interlocking device in Embodiment 2 of this utility model;

[0074] Figure 28 This is a schematic diagram showing the structure of the interlocking device for the compartment door in Embodiment 2 of this utility model when it is closed.

[0075] Figure 29 This is a schematic diagram showing the structure of the interlocking device for the compartment door panel in Embodiment 2 of this utility model.

[0076] Figure 30 This is a schematic diagram of the structural working state of the interlocking device for the compartment door panel in Embodiment 2 of this utility model. Detailed Implementation

[0077] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0078] Example 1

[0079] An interlocking device for preventing misoperation of a gas-insulated switchgear includes a three-position interlocking device 1, a circuit breaker interlocking device 2, and a compartment door interlocking device 3, all three being installed at corresponding positions on the gas-insulated switchgear.

[0080] The three-position interlocking device 1 includes an operation panel 11, a three-position mechanical lock 12, and a three-position travel baffle 13. The operation panel 11 is provided with a handle operation hole 111. The three-position mechanical lock 12 is fixed on the operation panel 11 and connected to the three-position travel baffle 13. The operation panel 11 is fixed on the direct-acting three-position operating mechanism of the gas filling cabinet. The three-position interlocking device 1 also includes a three-position travel switch 14, which is fixed on the operation panel 11.

[0081] The three-position mechanical lock 12 is provided with a three-position locking tongue 121. One end of the three-position locking tongue 121 is connected to the three-position travel baffle 13, and the other end corresponds to the position of the handle operation hole 111.

[0082] The three-position interlocking device 1 also includes a position indicator 15 and a three-position drive shaft 16. One side of the three-position drive shaft 16 is connected to the direct-acting three-position operating mechanism of the gas filling cabinet, and the other side is connected to the position indicator 15.

[0083] The position indicator panel 15 is provided with a status indicator group 151, which has three groups: the disconnect switch closed position 1511, the disconnect switch open position 1512, and the grounding switch closed position 1513. The operation panel 11 is provided with an indicator hole 112, through which the status indicator group 151 can be exposed. The position indicator panel 15 is provided with an indicator groove 152, the shape of which is adapted to the three-position travel baffle 13. The disconnect switch open position 1512 is actually the grounding switch open position, and the two share the same position, which is the middle position in the prior art. The positional relationship will not be described in detail here.

[0084] The three-position limit switch 14 is electrically connected to the three-position motor in the direct-acting three-position operating mechanism of the gas filling cabinet.

[0085] Although the direct-acting three-position operating mechanism of the gas-filled switchgear has been mentioned several times in the above scheme, this scheme aims to optimize and improve the original direct-acting three-position operating mechanism of the gas-filled switchgear without changing the main structural features of the existing direct-acting three-position operating mechanism. The direct-acting three-position operating mechanism is part of the gas-filled switchgear, so it will not be elaborated on here.

[0086] The three positions of the direct-acting three-position operating mechanism refer to closing, opening, and grounding. The drive shaft drives the sprocket and screw to rotate, causing the moving contact in the primary mechanism of the three positions to move back and forth, thus realizing the opening and closing operations of the isolating switch and the grounding switch respectively. This is the conventional structure of the direct-acting three-position operating mechanism. Simultaneously, the three-position drive shaft 16 drives the position indicator disk 15 to rotate, which is used to display the specific opening and closing positions of the direct-acting three-position operating mechanism on the operation panel 11, as follows:

[0087] Unlocked status (e.g.) Figure 4 As shown): When the three-position drive shaft 16 moves to the closed position 1511 or the open position 1512 of the isolating switch on the status indicator group 151, the three-position travel baffle 13 presses against the travel switch contact, causing the three-position travel switch 14 to close, and the three-position secondary control circuit (such as...) Figure 15 When the three-position motor is connected (as shown), it operates normally; the three-position travel baffle 13 cannot be inserted into the indicator groove 152, the three-position mechanical lock 12 cannot be locked, the key K1 cannot be pulled out, the handle operation hole 111 is unobstructed, and the operating handle can be inserted and operated normally.

[0088] Locked state (e.g.) Figure 5 (As shown): When the drive shaft moves to the grounding switch closed position 1513 on the status indicator group 151, the position of the indicator groove 152 rotates to the unlocked position of the three-position travel baffle 13. Turning the key K1 locks the three-position mechanical lock 12, and the three-position travel baffle 13 moves horizontally into the indicator groove 152, causing the three-position travel switch 14 to open. The three-position locking tongue 121 blocks the handle operation hole 111, preventing the operating handle from being inserted and operated. At the same time, the contacts of the three-position travel switch 14 are released, disconnecting the three-position motor control circuit, that is, the three-position secondary control circuit (such as...). Figure 15 As shown, this effectively closes and disconnects the manual or electric operation of the direct-acting three-position operating mechanism, achieving position locking of the grounding switch. At this point, key K1 can be removed and used to unlock the circuit breaker mechanical lock 24.

[0089] The circuit breaker interlocking device 2 includes a support plate 21, a limit baffle 22, a circuit breaker travel baffle 23, and a circuit breaker mechanical lock 24. The circuit breaker mechanical lock 24 is mounted on the support plate 21, and one end of the limit baffle 22 can move on the support plate 21. The support plate 21 is fixed to the circuit breaker operating mechanism of the gas-filled switchgear. The circuit breaker interlocking device 2 also includes a circuit breaker travel switch 25, which is fixed on the support plate 21 and its position corresponds to the circuit breaker travel baffle 23.

[0090] Although the circuit breaker operating mechanism of the gas-insulated switchgear has been mentioned several times in the above scheme, this scheme aims to optimize and improve the original circuit breaker operating mechanism of the gas-insulated switchgear without changing the main structural features of the existing circuit breaker operating mechanism. The circuit breaker operating mechanism is part of the gas-insulated switchgear, so it will not be elaborated on here. The same applies to the gas-insulated switchgear, so it will not be elaborated on here either.

[0091] The limiting baffle 22 is provided with a pressure block 26 at one end. The pressure block 26 is connected to the connecting rod of the circuit breaker operating mechanism. The connecting rod is also part of the original structure of the circuit breaker operating mechanism. This solution achieves certain actions by means of the connecting rod without changing the structure of the connecting rod itself, so it will not be described in detail.

[0092] The support plate 21 is provided with a limiting stop hole 211, and the circuit breaker mechanical lock 24 is provided with a circuit breaker lock tongue 241 inside. The shape of the circuit breaker lock tongue 241 is adapted to the limiting stop hole 211. One end of the circuit breaker lock tongue 241 corresponds to the position of the limiting stop hole 211, and the other end is connected to the circuit breaker travel baffle 23.

[0093] The circuit breaker interlocking device 2 also includes a mounting plate 27 and a sliding plate 28. The mounting plate 27 is fixed on the support plate 21, and the mounting plate 27 has a mounting hole groove on one side corresponding to the limiting baffle 22 that matches the limiting baffle hole 211. The sliding plate 28 is slidably connected to the mounting plate 27.

[0094] The slide plate 28 is provided with a handle 281. The handle 281 is connected to the mounting plate 27 at a position where it is a cuboid with rounded sides, and can be moved or fixed at a corresponding position to the mounting plate 27.

[0095] Both the mounting plate 27 and the sliding plate 28 are provided with switch slots 271, and their shapes are adapted to the opening and closing buttons of the circuit breaker operating mechanism.

[0096] The circuit breaker limit switch 25 is electrically connected to the circuit breaker motor in the circuit breaker operating mechanism of the gas-filled cabinet.

[0097] Its main function is to close the circuit breaker operating mechanism when the grounding switch of the direct-acting three-position operating mechanism is closed, and after completing the effective grounding of the line side, disconnect the secondary motor circuit of the circuit breaker (such as...). Figure 16 (As shown) At the same time, the circuit breaker opening and closing buttons are covered to prevent accidental opening of the circuit breaker switch by personnel, whether electrically or manually. Only after the circuit breaker operating mechanism is closed and the circuit breaker mechanical lock 24 on the support plate 21 is locked, at which point the slide plate 28 is on the upper edge of the circuit breaker locking tongue 241, and the opening and closing buttons of the circuit breaker operating mechanism are covered to prevent human error from the outside, as detailed below:

[0098] When the circuit breaker operating mechanism is in the open state: the connecting rod is in the lowest position. At this time, the limit baffle 22 blocks the circuit breaker locking tongue 241, so that the circuit breaker mechanical lock 24 cannot be locked. The circuit breaker mechanical lock 24 is in the unlocked state, the key K2 cannot be pulled out, and the contacts of the circuit breaker limit switch 25 are released and in the normally closed state. The secondary electric circuit of the circuit breaker is normally connected. At this time, the circuit breaker operating mechanism open and close buttons are unobstructed and can be operated normally.

[0099] When the gas-insulated switchgear cable compartment needs maintenance: the circuit breaker operating mechanism needs to be closed to form an effective grounding on the line side. After the circuit breaker operating mechanism completes the closing, the connecting rod will move upward in a straight line with the rotation of the circuit breaker main shaft, driving the limit baffle 22 on the side of the pressure block 26 to move upward. Then, the handle 281 is operated to lift the slide plate 28 upward, rotate it and lock it. The opening and closing buttons of the circuit breaker operating mechanism are covered, and manual opening and closing cannot be performed. At this time, the circuit breaker mechanical lock 24 can be locked. The circuit breaker lock tongue 241 is inserted into the lower edge of the slide plate 28 to prevent the slide plate 28 from being lowered. After the circuit breaker mechanical lock 24 is locked, the circuit breaker travel baffle 23 presses the contact of the circuit breaker travel switch 25, causing the normally closed contact of the circuit breaker travel switch 25 to open, cutting off the electric operating circuit of the circuit breaker operating mechanism, so that personnel cannot operate the switch buttons of the circuit breaker operating mechanism electrically or manually.

[0100] The compartment door interlocking device 3 includes a fixing plate 31, a lock box 32, a compartment mechanical lock 33, and an automatic limit device 34. Both the compartment mechanical lock 33 and the automatic limit device 34 are installed in the lock box 32 and correspond to each other. The fixing plate 31 has a fixing hole 311, and the compartment mechanical lock 33 has a compartment locking tongue 331. The compartment locking tongue 331 corresponds to the position of the fixing hole 311. The compartment door interlocking device 3 installed in the gas cabinet compartment door is used to unlock the compartment mechanical lock 33 only after the grounding switch of the three-position operating mechanism is closed and the three-position mechanical lock 12 is locked, and the circuit breaker operating mechanism is closed and the circuit breaker mechanical lock 24 is locked. After the circuit breaker operating mechanism is closed and the circuit breaker mechanical lock 24 is locked, the key K2 can be pulled out to unlock the compartment mechanical lock 33 on the compartment door. After the compartment door is opened, the automatic limit device 34 in the lock box 32 will restrict the operation of the compartment mechanical lock 33 on the compartment door. At this time, the key K2 cannot be pulled out to prevent personnel from using the key to unlock the circuit breaker operating mechanism.

[0101] The automatic limiting device 34 includes a limiting main board 341 and a limiting slide plate 342. The limiting slide plate 342 is movably mounted on the limiting main board 341, and the limiting slide plate 342 is connected to the limiting main board 341 through a spring. The position of the limiting slide plate 342 corresponds to the position of the fixed plate 31.

[0102] The fixing plate 31 is installed inside the gas filling cabinet.

[0103] When the compartment door is closed, the fixed plate 31 pushes the limit slide plate 342 on the automatic limit device 34, so that the compartment lock tongue 331 can pass through the lock hole of the limit main plate 341, lock the compartment door and prevent it from being opened.

[0104] After unlocking the compartment door panel with key K2 and opening the compartment door panel, the fixed plate 31 pulls out the automatic limit device 34. The automatic limit device 34 resets the limit slide plate 342 through the spring. At this time, the compartment lock tongue 331 is blocked by the limit slide plate 342 and cannot perform the locking operation, that is, key K2 cannot be pulled out, preventing key K2 from being pulled out and used to unlock the circuit breaker operating mechanism when personnel are performing maintenance operations in the compartment.

[0105] The lock cylinder of the three-position mechanical lock 12 is adapted to one of the lock cylinders of the circuit breaker mechanical lock 24, and the other lock cylinder of the circuit breaker mechanical lock 24 is adapted to the lock cylinder of the compartment mechanical lock 33. Both the three-position mechanical lock 12 and the compartment mechanical lock 33 are single-core mechanical locks, and the circuit breaker mechanical lock 24 is a double-core mechanical lock.

[0106] The three-position mechanical lock 12 is a single lock cylinder. Only when the three-position lock tongue 121 is fully extended in the locked state can the key K1 be pulled out and used to unlock the circuit breaker mechanical lock 24.

[0107] The circuit breaker mechanical lock 24 has a double lock cylinder. In the normal unlocking state, when key K2 is inserted into the circuit breaker mechanical lock 24, the circuit breaker mechanical lock 24 cannot be operated, and key K2 cannot be removed. Only after key K1 is inserted and rotated to the correct position can key K2 perform the locking operation. After locking, key K1 cannot be removed, but key K2 can be removed and used to unlock the compartment mechanical lock 33. Conversely, after key K2 is unlocked and rotated to the correct position, key K1 can be rotated and removed to unlock the three-position mechanical lock 12. In this case, key K2 cannot be removed.

[0108] The compartment mechanical lock 33 is a single lock cylinder. When it is locked, key K2 is inserted and an unlocking operation is performed. After unlocking, key K2 cannot be removed. Conversely, key K2 can only be removed when the compartment mechanical lock 33 is locked, and can be used to unlock the circuit breaker mechanical lock 24.

[0109] Example 2

[0110] Assuming the basic scheme remains unchanged, the interlocking devices for preventing misoperation of the gas-insulated switchgear include a three-position interlocking device 1, a circuit breaker interlocking device 2, and a compartment door interlocking device 3, all of which are installed at corresponding positions on the gas-insulated switchgear.

[0111] The three-position interlocking device 1 includes an operation panel 11, a three-position mechanical lock 12, and a three-position travel baffle 13. The operation panel 11 is provided with a handle operation hole 111. The three-position mechanical lock 12 is fixed on the operation panel 11 and connected to the three-position travel baffle 13. The operation panel 11 is fixed on the direct-acting three-position operating mechanism of the gas filling cabinet. The three-position interlocking device 1 also includes a three-position travel switch 14, which is fixed on the operation panel 11.

[0112] The three-position mechanical lock 12 is provided with a three-position locking tongue 121. One end of the three-position locking tongue 121 is connected to the three-position travel baffle 13, and the other end corresponds to the position of the handle operation hole 111.

[0113] The three-position interlocking device 1 also includes a position indicator 15 and a three-position drive shaft 16. One side of the three-position drive shaft 16 is connected to the direct-acting three-position operating mechanism of the gas filling cabinet, and the other side is connected to the position indicator 15.

[0114] The position indicator panel 15 is provided with a status indicator group 151, which has three groups: the disconnect switch closed position 1511, the disconnect switch open position 1512, and the grounding switch closed position 1513. The operation panel 11 is provided with an indicator hole 112, through which the status indicator group 151 can be exposed. The position indicator panel 15 is provided with an indicator groove 152, the shape of which is adapted to the three-position travel baffle 13. The disconnect switch open position 1512 is actually the grounding switch open position, and the two share the same position, which is the middle position in the prior art. The positional relationship will not be described in detail here.

[0115] The three-position limit switch 14 is electrically connected to the three-position motor in the direct-acting three-position operating mechanism of the gas filling cabinet.

[0116] Although the direct-acting three-position operating mechanism of the gas-filled switchgear has been mentioned several times in the above scheme, this scheme aims to optimize and improve the original direct-acting three-position operating mechanism of the gas-filled switchgear without changing the main structural features of the existing direct-acting three-position operating mechanism. The direct-acting three-position operating mechanism is part of the gas-filled switchgear, so it will not be elaborated on here.

[0117] The three positions of the direct-acting three-position operating mechanism refer to closing, opening, and grounding. The drive shaft drives the sprocket and screw to rotate, causing the moving contact in the primary mechanism of the three positions to move back and forth, thus realizing the opening and closing operations of the isolating switch and the grounding switch respectively. This is the conventional structure of the direct-acting three-position operating mechanism. Simultaneously, the three-position drive shaft 16 drives the position indicator disk 15 to rotate, which is used to display the specific opening and closing positions of the direct-acting three-position operating mechanism on the operation panel 11, as follows:

[0118] Unlocked status (e.g.) Figure 20 As shown): When the three-position drive shaft 16 moves to the closed position 1511 or the open position 1512 of the isolating switch on the status indicator group 151, the three-position travel baffle 13 presses against the travel switch contact, causing the three-position travel switch 14 to close, and the three-position secondary control circuit (such as...) Figure 15 When the three-position motor is connected (as shown), it operates normally; the three-position travel baffle 13 cannot be inserted into the indicator groove 152, the three-position mechanical lock 12 cannot be locked, the key K1 cannot be pulled out, the handle operation hole 111 is unobstructed, and the operating handle can be inserted and operated normally.

[0119] Locked state (e.g.) Figure 21 (As shown): When the drive shaft moves to the grounding switch closed position 1513 on the status indicator group 151, the position of the indicator groove 152 rotates to the unlocked position of the three-position travel baffle 13. Turning the key K1 locks the three-position mechanical lock 12, and the three-position travel baffle 13 moves horizontally into the indicator groove 152, causing the three-position travel switch 14 to open. The three-position locking tongue 121 blocks the handle operation hole 111, preventing the operating handle from being inserted and operated. At the same time, the contacts of the three-position travel switch 14 are released, disconnecting the three-position motor control circuit, that is, the three-position secondary control circuit (such as...). Figure 15 As shown), this effectively closes and disconnects the manual or electric operation of the direct-acting three-position operating mechanism, achieving position locking of the grounding switch. At this point, key K1 can be removed and used to unlock the compartment mechanical lock 33.

[0120] The circuit breaker interlocking device 2 includes a support plate 21, a limit baffle 22, a circuit breaker travel baffle 23, and a circuit breaker mechanical lock 24. The circuit breaker mechanical lock 24 is mounted on the support plate 21, and one end of the limit baffle 22 can move on the support plate 21. The support plate 21 is fixed to the circuit breaker operating mechanism of the gas-filled switchgear. The circuit breaker interlocking device 2 also includes a circuit breaker travel switch 25, which is fixed on the support plate 21 and its position corresponds to the circuit breaker travel baffle 23.

[0121] Although the circuit breaker operating mechanism of the gas-insulated switchgear has been mentioned several times in the above scheme, this scheme aims to optimize and improve the original circuit breaker operating mechanism of the gas-insulated switchgear without changing the main structural features of the existing circuit breaker operating mechanism. The circuit breaker operating mechanism is part of the gas-insulated switchgear, so it will not be elaborated on here. The same applies to the gas-insulated switchgear, so it will not be elaborated on here either.

[0122] The limiting baffle 22 is provided with a pressure block 26 at one end. The pressure block 26 is connected to the connecting rod of the circuit breaker operating mechanism. The connecting rod is also part of the original structure of the circuit breaker operating mechanism. This solution achieves certain actions by means of the connecting rod without changing the structure of the connecting rod itself, so it will not be described in detail.

[0123] The support plate 21 is provided with a limiting stop hole 211, and the circuit breaker mechanical lock 24 is provided with a circuit breaker lock tongue 241 inside. The shape of the circuit breaker lock tongue 241 is adapted to the limiting stop hole 211. One end of the circuit breaker lock tongue 241 corresponds to the position of the limiting stop hole 211, and the other end is connected to the circuit breaker travel baffle 23.

[0124] The circuit breaker interlocking device 2 also includes a mounting plate 27 and a sliding plate 28. The mounting plate 27 is fixed on the support plate 21, and the mounting plate 27 has a mounting hole groove on one side corresponding to the limiting baffle 22 that matches the limiting baffle hole 211. The sliding plate 28 is slidably connected to the mounting plate 27.

[0125] The slide plate 28 is provided with a handle 281. The handle 281 is connected to the mounting plate 27 at a position where it is a cuboid with rounded sides, and can be moved or fixed at a corresponding position to the mounting plate 27.

[0126] Both the mounting plate 27 and the sliding plate 28 are provided with switch slots 271, and their shapes are adapted to the opening and closing buttons of the circuit breaker operating mechanism.

[0127] The circuit breaker limit switch 25 is electrically connected to the circuit breaker motor in the circuit breaker operating mechanism of the gas-filled cabinet.

[0128] Its main function is to close the circuit breaker operating mechanism when the grounding switch of the direct-acting three-position operating mechanism is closed, and after completing the effective grounding of the line side, disconnect the secondary motor circuit of the circuit breaker (such as...). Figure 16 (As shown) At the same time, the circuit breaker opening and closing buttons are covered to prevent accidental opening of the circuit breaker switch by personnel, whether electrically or manually. Only after the circuit breaker operating mechanism is closed and the circuit breaker mechanical lock 24 on the support plate 21 is locked, at which point the slide plate 28 is on the upper edge of the circuit breaker locking tongue 241, and the opening and closing buttons of the circuit breaker operating mechanism are covered to prevent human error from the outside, as detailed below:

[0129] When the circuit breaker operating mechanism is in the open state: the connecting rod is in the lowest position. At this time, the limit baffle 22 blocks the circuit breaker locking tongue 241, so that the circuit breaker mechanical lock 24 cannot be locked. The circuit breaker mechanical lock 24 is in the unlocked state, the key K2 cannot be pulled out, and the contacts of the circuit breaker limit switch 25 are released and in the normally closed state. The secondary electric circuit of the circuit breaker is normally connected. At this time, the circuit breaker operating mechanism open and close buttons are unobstructed and can be operated normally.

[0130] When the gas-insulated switchgear cable compartment needs maintenance: the circuit breaker operating mechanism needs to be closed to form an effective grounding on the line side. After the circuit breaker operating mechanism completes the closing, the connecting rod will move upward in a straight line with the rotation of the circuit breaker main shaft, driving the limit baffle 22 on the side of the pressure block 26 to move upward. Then, the handle 281 is operated to lift the slide plate 28 upward, rotate it and lock it. The opening and closing buttons of the circuit breaker operating mechanism are covered, and manual opening and closing cannot be performed. At this time, the circuit breaker mechanical lock 24 can be locked. The circuit breaker lock tongue 241 is inserted into the lower edge of the slide plate 28 to prevent the slide plate 28 from being lowered. After the circuit breaker mechanical lock 24 is locked, the circuit breaker travel baffle 23 presses the contact of the circuit breaker travel switch 25, causing the normally closed contact of the circuit breaker travel switch 25 to open, cutting off the electric operating circuit of the circuit breaker operating mechanism, so that personnel cannot operate the switch buttons of the circuit breaker operating mechanism electrically or manually.

[0131] The compartment door interlocking device 3 includes a fixing plate 31, a lock box 32, a compartment mechanical lock 33, and an automatic limit device 34. Both the compartment mechanical lock 33 and the automatic limit device 34 are housed within the lock box 32 and correspond to each other. The fixing plate 31 has a fixing hole 311, and the compartment mechanical lock 33 has a compartment locking tongue 331, which corresponds to the fixing hole 311. The compartment door interlocking device 3, installed in the gas-filled cabinet compartment door, locks when the three-position grounding switch is closed. After the three-position mechanical lock 12 on the control panel 11 is closed and the circuit breaker operating mechanism is locked, the key K1 and key K2 can be pulled out to unlock the compartment mechanical lock 33. After the compartment door is opened, the automatic limit device 34 in the lock box 32 is pulled back by the internal spring, which will restrict the operation of the compartment mechanical lock 33 on the compartment door. At this time, the key K1 and key K2 cannot be pulled out to prevent personnel from using the key to unlock the three-position mechanical lock 12 or the circuit breaker mechanical lock 24.

[0132] The automatic limiting device 34 includes a limiting main board 341 and a limiting slide plate 342. The limiting slide plate 342 is movably mounted on the limiting main board 341, and the limiting slide plate 342 is connected to the limiting main board 341 through a spring. The position of the limiting slide plate 342 corresponds to the position of the fixed plate 31.

[0133] The fixing plate 31 is installed inside the gas filling cabinet.

[0134] When the compartment door is closed, the fixed plate 31 pushes the limit slide plate 342 on the automatic limit device 34, so that the compartment lock tongue 331 can pass through the lock hole of the limit main plate 341, lock the compartment door and prevent it from being opened.

[0135] Unlock the compartment mechanical lock 33 on the compartment door panel with key K1 and key K2, and after opening the compartment door panel, the fixed plate 31 pulls out the automatic limit device 34. The automatic limit device 34 resets the limit slide plate 342 through the spring. At this time, the compartment lock tongue 331 cannot be locked because it is blocked by the limit slide plate 342. That is, key K1 and key K2 cannot be pulled out, preventing key K1 or key K2 from being pulled out and used to unlock the three-position operating mechanism or the circuit breaker operating mechanism when personnel are performing maintenance operations in the compartment.

[0136] The lock cylinders on the three-position mechanical lock 12 and the circuit breaker mechanical lock 24 are matched one-to-one with the lock cylinders on the compartment mechanical lock 33. The compartment mechanical lock 33 is a double-core mechanical lock, while the three-position mechanical lock 12 and the circuit breaker mechanical lock 24 are both single-core mechanical locks.

[0137] The three-position mechanical lock 12 is a single lock cylinder. Only when the three-position lock tongue 121 is fully extended in the locked state can the key K1 be pulled out and used to unlock the compartment mechanical lock 33.

[0138] The circuit breaker mechanical lock 24 is a single lock cylinder. The key K2 can only be pulled out and used to unlock the compartment mechanical lock 33 when the circuit breaker lock tongue 241 is fully extended in the locked state.

[0139] The compartment mechanical lock 33 has a double lock cylinder. When locked, it can only be unlocked by inserting both keys K1 and K2 simultaneously. After unlocking, keys K1 and K2 cannot be removed. Conversely, keys K1 and K2 can only be removed when the compartment mechanical lock 33 is locked, that is, when the compartment bolt 331 is fully extended, for unlocking the three-position mechanical lock 12 and the circuit breaker mechanical lock 24.

[0140] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0141] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0142] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An interlocking device for preventing misoperation of a gas-filled cabinet, characterized in that: It comprises three interlocking devices (1), circuit breaker interlocking device (2), compartment door interlocking device (3), and three are installed on the corresponding position of the gas-filled cabinet, The three interlocking devices (1) comprise an operating panel (11), a three-position mechanical lock (12), and a three-position travel baffle (13). The operating panel (11) is provided with a handle operating hole (111). The three-position mechanical lock (12) is fixed on the operating panel (11). The three-position mechanical lock (12) is connected to the three-position travel baffle (13). The circuit breaker interlocking device (2) comprises a support plate (21), a limiting baffle (22), a circuit breaker travel baffle (23), and a circuit breaker mechanical lock (24). The circuit breaker mechanical lock (24) is arranged on the support plate (21). One end of the limiting baffle (22) is movable on the support plate (21). The compartment door interlocking device (3) comprises a fixed plate (31), a lock box (32), a compartment mechanical lock (33), and an automatic limiting device (34). The compartment mechanical lock (33) and the automatic limiting device (34) are both arranged in the lock box (32) and correspond to each other. The fixed plate (31) is provided with a fixed hole (311).

2. The interlocking device for preventing misoperation of an air chamber according to claim 1, characterized in that: The operating panel (11) is fixed on the direct-acting three-position operating mechanism of the gas-filled cabinet. The three interlocking devices (1) further comprise a three-position travel switch (14), which is fixed on the operating panel (11).

3. The interlocking device for preventing misoperation of an air chamber according to claim 1, characterized in that: The three-position mechanical lock (12) is provided with a three-position lock tongue (121). One end of the three-position lock tongue (121) is connected to the three-position travel baffle (13), and the other end corresponds to the position of the handle operating hole (111).

4. The interlocking device for preventing misoperation of an air chamber according to claim 1, characterized in that: The three interlocking devices (1) further comprise a position indicating disc (15) and a three-position transmission shaft (16). One side of the three-position transmission shaft (16) is connected to the direct-acting three-position operating mechanism of the gas-filled cabinet, and the other side is connected to the position indicating disc (15).

5. The interlocking device for preventing misoperation of the surge tank according to claim 4, characterized in that: The position indicating disc (15) is provided with a state indicator group (151). The state indicator group (151) is provided with three groups, which are the isolating switch closing position (1511), the isolating switch opening position (1512), and the grounding switch closing position (1513). The operating panel (11) is provided with an indicating hole (112). The state indicator group (151) can be exposed from the indicating hole (112).

6. The interlocking device for preventing misoperation of an air chamber according to claim 4, characterized in that: The position indicating disc (15) is provided with an indicating groove (152). The shape of the indicating groove (152) is adapted to the three-position travel baffle (13).

7. The interlocking device for preventing misoperation of the surge tank according to claim 2, characterized in that: The three-position travel switch (14) is electrically connected to the three-position motor in the direct-acting three-position operating mechanism of the gas-filled cabinet.

8. The interlocking device for preventing misoperation of an air chamber according to claim 1, characterized in that: The support plate (21) is fixed on the circuit breaker operating mechanism of the gas-filled cabinet. The circuit breaker interlocking device (2) further comprises a circuit breaker travel switch (25), which is fixed on the support plate (21) and corresponds to the position of the circuit breaker travel baffle (23).

9. The interlocking device for preventing misoperation of the surge tank according to claim 8, characterized in that: One end of the limiting baffle (22) is provided with a pressing block (26), which is connected to the connecting rod of the circuit breaker operating mechanism.

10. The interlocking device for preventing misoperation of an air chamber according to claim 1, characterized in that: The support plate (21) is provided with a limiting stop hole (211), the circuit breaker mechanical lock (24) is internally provided with a circuit breaker lock tongue (241), the circuit breaker lock tongue (241) is shaped to be matched with the limiting stop hole (211), one end of the circuit breaker lock tongue (241) corresponds the position of the limiting stop hole (211), and the other end is connected with the circuit breaker stroke stop plate (23).

11. The interlocking device for preventing misoperation of the surge tank according to claim 10, characterized in that: The circuit breaker interlocking device (2) further comprises a mounting plate (27) and a sliding plate (28), the mounting plate (27) is fixed on the support plate (21), and the mounting plate (27) is provided with a mounting hole groove matched with the limiting stop hole (211) on the side corresponding to the limiting stop plate (22), and the sliding plate (28) is slidably connected with the mounting plate (27).

12. The interlocking device for preventing misoperation of an air chamber according to claim 11, characterized in that: The sliding plate (28) is provided with a handle (281), and the position where the handle (281) is connected with the mounting plate (27) is provided with a circular arc on both sides of a cuboid, so that the handle (281) can be moved or fixed at the corresponding position of the mounting plate (27).

13. The interlocking device for preventing misoperation of an air chamber according to claim 12, characterized in that: The mounting plate (27) and the sliding plate (28) are both provided with a switch groove (271), and the shape of the switch groove (271) is matched with the opening and closing button of the circuit breaker operating mechanism.

14. The anti-misoperation interlocking device for the surge tank according to claim 8, characterized in that: The circuit breaker stroke switch (25) is electrically connected with the circuit breaker motor in the circuit breaker operating mechanism of the gas-filled cabinet.

15. The interlocking device for preventing misoperation of an air chamber according to claim 1, characterized in that: The compartment mechanical lock (33) is internally provided with a compartment lock tongue (331), and the compartment lock tongue (331) corresponds the position of the fixed hole (311).

16. The interlocking device for preventing misoperation of an air chamber according to claim 1, characterized in that: The automatic limiting device (34) comprises a limiting main plate (341) and a limiting sliding plate (342), the limiting sliding plate (342) is movably arranged on the limiting main plate (341), and the limiting sliding plate (342) is internally connected with the limiting main plate (341) through a spring, and the position of the limiting sliding plate (342) corresponds the position of the fixed plate (31).

17. The anti-misoperation interlocking device for the surge tank according to claim 1, characterized in that: The fixed plate (31) is arranged in the gas-filled cabinet.

18. The anti-misoperation interlocking device for the surge tank according to claim 1, characterized in that: The lock cylinder of the three-position mechanical lock (12) is matched with one of the lock cylinders of the circuit breaker mechanical lock (24), and the other lock cylinder of the circuit breaker mechanical lock (24) is matched with the lock cylinder of the compartment mechanical lock (33).

19. The anti-misoperation interlocking device for the surge tank according to claim 18, characterized in that: The circuit breaker mechanical lock (24) is a double-cylinder mechanical lock, and the three-position mechanical lock (12) and the compartment mechanical lock (33) are single-cylinder mechanical locks.

20. The interlocking device for preventing misoperation of an air chamber according to claim 1, characterized in that: The respective lock cylinders of the three-position mechanical lock (12) and the circuit breaker mechanical lock (24) can also be matched with the lock cylinder of the compartment mechanical lock (33) one by one.

21. The anti-misoperation interlocking device for the surge tank according to claim 20, characterized in that: The compartment mechanical lock (33) is a double-cylinder mechanical lock, and the three-position mechanical lock (12) and the circuit breaker mechanical lock (24) are single-cylinder mechanical locks.

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