High-voltage switchgear and interlocking device for high-voltage switchgear

Abstract

The present application provides a high-voltage switchgear and an interlocking device for a high-voltage switchgear. The interlocking device includes a first interlocking assembly, a first program lock assembly, a first elastic locking member, and a second program lock assembly; the second program lock assembly and the first program lock assembly share an unlocking key. The first program lock assembly is used to unlock or lock the first interlocking assembly; the first elastic locking member is used to unlock or lock the first program lock assembly; when the circuit breaker trolley reaches the corresponding test position, the first program lock assembly enters a locked state and locks the first interlocking assembly to lock the circuit breaker trolley in the corresponding test position, so that the isolation trolley can be moved only when the circuit breaker trolley is maintained in the corresponding test position. The interlocking device provided by the present application can effectively prevent the separation of the isolating switch with charge.

Description

Technical Field

[0001] The present application relates to the technical field of high-voltage switchgear, and in particular to a high-voltage switchgear and an interlocking device for the high-voltage switchgear. Background Art

[0002] Over the years, statistics from numerous electrical accidents have shown that personal injuries and fatalities from electric shock and electrical equipment accidents are often directly related to the technical and professional level of electrical workers. Therefore, strictly adhering to the "Five Preventions" electrical safety regulations can effectively reduce and prevent accidents caused by misoperation. The five preventions for high-voltage switchgear are: 1. Prevention of opening and closing disconnectors under load; 2. Prevention of accidental opening and closing of circuit breakers; 3. Prevention of closing grounding switches under load; 4. Prevention of load being applied while the grounding switch is closed; and 5. Prevention of accidental entry into energized compartments. To prevent accidents caused by misoperation, switchgear must be equipped with reliable interlocking and locking devices to ensure correct operating procedures and prevent these five types of misoperation.

[0003] GB / T 3906-2020, Section 6.13 Interlocking Devices, stipulates the following interlocking requirements: Metal-enclosed switchgear and control equipment equipped with disconnectors shall be equipped with interlocks to prevent the disconnectors from being operated outside specified conditions. The disconnectors can only be operated when the associated circuit breaker, load switch, or contactor is in the open position. This means that the switchgear must prevent the disconnectors from being opened or closed under load. However, there is currently no solution in the industry that can reliably implement this function with a door-closing interlock trolley.

[0004] Therefore, how to provide a new interlocking solution to reliably realize the function of preventing the disconnector from opening and closing under load has always been a technical problem that those skilled in the art have been committed to solving.

[0005] The above information disclosed in this Background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the Invention

[0006] An object of the present application is to provide an interlocking device for a high-voltage switchgear that can prevent an isolating switch from being operated under load.

[0007] Another object of the present application is to provide a high-voltage switchgear having an isolating switch capable of preventing load operation.

[0008] To solve the above technical problems, this application adopts the following technical solutions:

[0009] According to one aspect of the present application, the present application provides an interlocking device for a high-voltage switchgear, which includes a circuit breaker cabinet and an isolation cabinet. A circuit breaker trolley is installed inside the circuit breaker cabinet, and an isolation trolley is installed inside the isolation cabinet. The interlocking device includes: a first interlocking component, which is installed on the circuit breaker trolley and is used to move the circuit breaker trolley so that the circuit breaker trolley reaches the test position or working position corresponding to the circuit breaker trolley; a first program lock component, which is fixed to the circuit breaker trolley; the first program lock component has an unlocking key, and the first program lock component is put into an unlocked state or a locked state by rotating the unlocking key to unlock or lock the first interlocking component; the unlocking key can be pulled out only when the first program lock component is in a locked state; a first elastic locking member, which is fixed to the circuit breaker trolley The circuit breaker trolley is used to unlock or lock the first program lock assembly; when the circuit breaker trolley reaches the corresponding test position, the circuit breaker trolley compresses the first elastic locking member to make the first elastic locking member pop out and unlock the first program lock assembly, so that the first program lock assembly can be put into a locked state by turning the unlocking key; when the first program lock assembly is in the locked state, the first interlocking assembly can be locked to lock the circuit breaker trolley in the corresponding test position and enable the unlocking key to be pulled out; and a second program lock assembly is installed on the isolation trolley; the second program lock assembly shares the unlocking key with the first program lock assembly, so that the isolation trolley can be moved by the unlocking key only when the circuit breaker trolley is maintained in the corresponding test position, so as to prevent the isolation switch on the isolation trolley from being separated by charge.

[0010] In some embodiments, the circuit breaker trolley has a corresponding static frame and a movable frame, and the first interlocking assembly is used to move the corresponding movable frame forward or backward relative to the corresponding static frame so that the circuit breaker trolley reaches a corresponding test position or working position; the static frame has a front frame bar; the first interlocking assembly and the first program lock assembly are both disposed on the front frame bar;

[0011] The first program lock assembly includes a first limit member, which has an extended position corresponding to when the first program lock assembly is in a locked state and a retracted position when it is in an unlocked state; the first chain assembly is provided with a movable operating socket, which is used for inserting a movable unlocking member to unlock the first chain assembly; the first limit member extends in the direction of the first chain assembly; when the first program lock assembly is in a locked state, the first limit member extends and blocks the movable operating socket to lock the first chain assembly.

[0012] In some embodiments, a first slot is provided on the first limiting member, and the slot is directed toward the first program lock assembly, and a locking position is provided at the bottom of the first slot; a first through hole is opened on the front end frame bar; the first elastic locking member includes a first straight rod and a first elastic member; the first straight rod is movably inserted into the first through hole; the first elastic member is sleeved on the first straight rod, and one end of the first elastic member is fixed on the rear side wall of the front end frame bar, and the other end is fixed on the first straight rod; a locking portion is provided on the end of the first straight rod away from the first elastic member; when the first limiting member is in the extended position, the position of the locking portion corresponds to the position of the locking position; when the circuit breaker trolley enters the corresponding test position, the moving frame pushes the first straight rod so that the locking portion is pushed out of the locking position to unlock the first program lock assembly.

[0013] In some embodiments, when the circuit breaker trolley is located at the corresponding test position, the first program lock assembly can be put into a locked state and the first interlocking assembly can be locked by turning an unlocking key.

[0014] In some embodiments, when the first program lock assembly is in an unlocked state and the circuit breaker leaves the corresponding test position, the first elastic member rebounds, driving the first locking portion to retract into the first locking slot, thereby locking the first program lock assembly by blocking the extension of the first limit member.

[0015] In some embodiments, the first interlocking component includes a transmission screw, a nut and a pressure-bearing movable plate; through holes corresponding to each other are distributed on the front end frame bar and the movable frame, for the transmission screw to pass through; the inner wall of the through hole corresponding to the movable frame is provided with a thread matching the outer wall of the transmission screw, so as to convert the rotational motion of the transmission screw into the linear motion of the movable frame; the nut is sleeved on the transmission screw and fixed on the front end frame bar; the nut has a first pipe section and a second pipe section, the outer contour of the first pipe section is circular, the outer contour of the second pipe section is polygonal, and the distance between any point on the outer contour of the second pipe section and the center of the nut is greater than or equal to the radius of the first pipe section; the first pipe section is located on the side of the nut close to the front end frame bar; the pressure-bearing movable plate is fixed on the front end frame bar and movably sleeved on the second pipe section; a movable operation socket is formed on the outer side of the pressure-bearing movable plate; when the unlocking member is inserted into the movable operation socket, and the pressure-bearing movable plate is pressed down and movably sleeved on the first pipe section, the first interlocking component is unlocked.

[0016] In some embodiments, the first interlocking assembly further includes a positioning plate; at least one of the transmission screw, the nut, and the pressure-bearing movable plate is fixed to the front frame bar through the positioning plate; when the circuit breaker trolley is located in the corresponding test position, the first extending member extends between the pressure-bearing movable plate and the positioning plate to prevent the pressure-bearing movable plate from pressing down, so that the first interlocking assembly is locked.

[0017] In some embodiments, the isolation trolley also includes a second interlocking assembly and a second elastic locking member. The second interlocking assembly is used to enable the isolation trolley to reach the corresponding test position or working position; when the isolation trolley is in the corresponding working position, the second elastic locking member unlocks the second program lock assembly so that the second program lock assembly can enter a locked state and the unlocking key can be pulled out.

[0018] In some embodiments, the second elastic locking member includes a second straight rod and a second elastic member; the second elastic member is sleeved on the second straight rod, and one end of the second elastic member is fixed on the static frame corresponding to the isolation trolley, and the other end is fixed on the second straight rod; the second straight rod is movably passed through the static frame and the corresponding dynamic frame corresponding to the isolation trolley, and the second straight rod is provided with an avoidance portion at one end of the corresponding static frame and a limit baffle at the other end; the second program lock assembly has an extendable second limit member, and a second card slot facing the second chain assembly is formed on the second limit member; when the isolation trolley enters the corresponding working position, the corresponding dynamic frame pulls the second straight rod through the limit baffle, and makes the avoidance portion in the second card slot.

[0019] In some embodiments, when the isolation trolley is located at the corresponding working position, the second limiting member is extended by rotating the unlocking key, so that the second interlocking assembly can be extended and locked, and the unlocking key can be pulled out.

[0020] In some embodiments, when the isolation trolley leaves the corresponding working position, the second elastic member rebounds to drive the avoidance portion to leave the second slot and allow the second straight rod to be locked in the slot to prevent the second limit member from extending and allow the unlocking key to remain in the second program lock assembly.

[0021] According to another aspect of the present application, a high-voltage switchgear is provided. The high-voltage switchgear has the interlocking device for the high-voltage switchgear as described above.

[0022] It can be seen from the above technical solution that the beneficial effects of this application are:

[0023] In the present application, since the second program lock assembly shares the unlocking key with the first program lock assembly, and the unlocking key can be pulled out only when the circuit breaker trolley is kept in the corresponding test position, the second program lock assembly can be unlocked by the unlocking key, and the isolation trolley can be moved away from the corresponding working position, thereby ensuring that the isolation trolley can be operated only when the circuit breaker trolley is in the test position, thereby preventing the isolation switch on the isolation trolley from being separated by charge.

[0024] It should be understood that the foregoing general description and the following detailed description are merely illustrative and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other objects, features and advantages of the present application will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.

[0026] Figure 1 1 is a schematic structural diagram of an interlocking device for a high-voltage switchgear according to an embodiment of the present application.

[0027] Figure 2 2 is a schematic structural diagram of a first program lock component according to an embodiment of the present application.

[0028] Figure 2 a is a structural diagram of the first program lock component in the unlocked state.

[0029] Figure 2 b is a structural diagram of the first program lock component in the locked state.

[0030] Figure 3 This is a structural schematic diagram of a circuit breaker trolley in a test position and a first program lock assembly in a locked state according to an embodiment of the present application.

[0031] Figure 4 yes Figure 3 Structural diagram of the circuit breaker trolley in the test position and the first program lock assembly in the unlocked state.

[0032] Figure 5 This is a cross-sectional view of a circuit breaker trolley in a test position and a first program lock assembly in a locked state according to an embodiment of the present application.

[0033] Figure 6 This is a structural schematic diagram of an isolation trolley in a corresponding working position according to an embodiment of the present application.

[0034] Figure 7 This is a structural schematic diagram of an isolation trolley not in a corresponding working position according to an embodiment of the present application.

[0035] Figure 8 2 is a schematic structural diagram of a second elastic locking member according to an embodiment of the present application.

[0036] Figure 9 This is an operational flow chart for disconnecting a busbar cabinet of a high-voltage switchgear provided according to an embodiment of the present application.

[0037] Figure 10 This is an operation flow chart of a closing busbar cabinet of a high-voltage switchgear provided according to an embodiment of the present application.

[0038] The following are the descriptions of the reference numerals:

[0039] 10. Circuit breaker trolley; 20. Isolation trolley;

[0040] 11. First elastic locking member; 12. First program lock assembly; 13. First interlocking assembly;

[0041] 21. Second elastic locking member; 22. Second program lock assembly; 23. Second interlocking assembly;

[0042] 101. Front end frame bar; 102. Moving frame; 111. First straight rod; 112. First elastic member; 113. Locking portion; 120. Locking hole; 121. Telescopic member; 121a. First slot; 121b. Positioning; 122. First limiting member; 131. Moving operation socket; 212. Second straight rod; 213. Second elastic member; 214. Avoiding portion; 215. Limit baffle. DETAILED DESCRIPTION

[0043] Although the present application can be easily embodied in different forms of embodiments, only some of the specific embodiments are shown in the drawings and will be described in detail in this specification. It should be understood that this description should be regarded as an exemplary illustration of the principles of the application and is not intended to limit the application to what is described herein.

[0044] Thus, a feature indicated in this specification will be used to illustrate one of the features of one embodiment of the present application, rather than implying that each embodiment of the present application must have the described feature. In addition, it should be noted that this specification describes many features. Although certain features can be combined together to illustrate possible system designs, these features can also be used in other, not explicitly described, combinations. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0045] In the embodiments shown in the accompanying drawings, directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of various components of the present application are not absolute but relative. These descriptions are appropriate when these components are in the positions shown in the accompanying drawings. If the descriptions of the positions of these components are changed, these directional indications will also change accordingly.

[0046] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of this application will be more comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The accompanying drawings are merely schematic illustrations of the present application and are not necessarily drawn to scale. Identical reference numerals in the figures indicate identical or similar parts, and thus repeated descriptions thereof will be omitted.

[0047] The preferred embodiments of the present application are further described in detail below in conjunction with the drawings of this specification.

[0048] To facilitate understanding of the solution provided by this application, the high-voltage switchgear and its structure are first introduced.

[0049] High-voltage switchgear is widely used in power distribution systems to receive and distribute electrical energy. It can activate or deactivate certain electrical equipment based on operational needs, and quickly remove the faulty portion of the system in the event of a fault, thereby ensuring the normal operation of the intact portion of the grid and the safety of both equipment and maintenance personnel. Therefore, high-voltage switchgear is a crucial power distribution device, and its safe and reliable operation is crucial to the system.

[0050] High-voltage switchgear is divided by partitions, typically forming at least a circuit breaker cabinet and an isolation cabinet. The isolation cabinet is used to safely isolate and disconnect points in distribution lines, ensuring the safety of high-voltage electrical equipment and devices during maintenance and isolation. The cabinet is typically made of steel or stainless steel.

[0051] The cabinet is usually equipped with specific guide rails for the trolley to slide and operate, so that the trolley can move between its working position and the test position. The static contact is usually installed on the rear wall of the trolley compartment. When the trolley is pulled out of the cabinet, the moving contact and the static contact separate, and the components on the trolley are disconnected from the high-voltage circuit. Conversely, when the trolley moves in the opposite direction until the trolley is fully closed, the static contact and the moving contact come into contact, establishing a circuit. In other words, it reaches the working position. In order to ensure that the operator does not touch the live parts when operating the trolley, a positioning device is usually installed on the track where the trolley is pulled out to ensure that the circuit is disconnected when the trolley stops at this position. This position is usually called the test position.

[0052] When the circuit breaker cabinet and the isolation chamber are away from the ground, a movable maintenance trolley can be used to assist in pulling out and pushing in the circuit breaker trolley and the isolation trolley. Specifically, the maintenance trolley can be pushed in front of the circuit breaker cabinet or isolation cabinet that needs to be pulled out, and the maintenance trolley positioning rod is aligned with the positioning hole on the switch cabinet. The maintenance trolley is pushed close to the cabinet body, and the maintenance trolley is locked on the cabinet body. The adjusting nut under the maintenance trolley tray is adjusted to connect the maintenance trolley track with the cabinet track, so that the trolley can be pulled out onto the maintenance trolley. In another embodiment, the trolley can also have a chassis car, which has a certain structural rigidity and is provided with a static frame and a movable frame. The circuit breaker body is fixed on the movable frame. The circuit breaker can be moved between the working position and the test position by moving the movable frame.

[0053] The interlocking device in the present application can ensure that the disconnector can be operated only when the circuit breaker is in the open position, thereby ensuring the safety of the operator and preventing unauthorized operation of the disconnector.

[0054] Figure 1FIG. 1 is a schematic diagram of the structure of an interlocking device for a high-voltage switchgear according to an embodiment of the present application. Figure 1 As shown, the high-voltage switchgear includes a circuit breaker cabinet and an isolation cabinet. A circuit breaker trolley 10 is installed inside the circuit breaker cabinet, and an isolation trolley 20 is installed inside the isolation cabinet. The interlocking device includes: a first interlocking component 13, a first program lock component 12, a first elastic locking member 11, and a second program lock component 22.

[0055] The first interlocking assembly 13 is mounted on the circuit breaker trolley and is used to move the circuit breaker trolley 10 so that the trolley 10 reaches the corresponding test position or working position. Specifically, the first interlocking assembly 13 may include a movable trolley movement lever and a movement operation socket provided on the circuit breaker trolley for moving the circuit breaker between the working position and the test position. Typically, after inserting the movement lever, turning it clockwise to move the circuit breaker in, and counterclockwise to move the circuit breaker out.

[0056] The first program lock assembly 12 is fixed to the circuit breaker trolley 10 and is used to control the first interlock assembly 13. Specifically, the first program lock assembly 12 has an unlocking key. By turning the unlocking key, the first program lock assembly can be placed in an unlocked state or a locked state, thereby unlocking or locking the first interlock assembly.

[0057] The first elastic locking member 11 is fixed to the circuit breaker trolley 10 and is used to unlock or lock the first program lock assembly 12. The first elastic locking member 11 can be an elastic blocking piece arranged inside the first program lock assembly 12, or a blocking member arranged outside the first program lock assembly 12 to limit the opening and closing of the first program lock assembly. The first elastic locking member 11 can unlock the first program lock assembly 12 after the circuit breaker reaches the set position.

[0058] In this embodiment, when the circuit breaker trolley 10 reaches the corresponding test position, the circuit breaker trolley 10 compresses the first elastic locking member 11, causing it to pop out and unlock the first program lock assembly 12. The first program lock assembly 12 can then be locked by turning the unlocking key, thereby locking the first interlocking assembly 13 and locking the circuit breaker trolley in the corresponding test position. Only when the first program lock assembly is locked can the unlocking key be removed and used to unlock the second program lock assembly 22 mounted on the isolation trolley 20.

[0059] Thus, the second program lock assembly 22 is used to assist in controlling the movement of the isolation trolley between the working position and the test position corresponding to the isolation trolley 20, and the second program lock assembly 22 and the first program lock assembly 12 share the unlocking key, and only when the circuit breaker trolley 10 is maintained in the corresponding test position can the unlocking key be pulled out, and then the second program lock assembly can be unlocked by the unlocking key, and then the isolation trolley can be moved from the corresponding working position. Therefore, it can be ensured that the isolation trolley 20 can be operated only when the circuit breaker trolley 10 is in the working position, preventing the isolation trolley from being operated during the movement and in the corresponding working position, thereby achieving the effect of preventing the isolating switch on the isolation trolley 20 from being separated by charge.

[0060] Figure 2 1 is a schematic diagram of the structure of the first program lock assembly according to an embodiment of the present application. As mentioned above, the first program lock assembly has an unlocking key, and the first program lock assembly is placed in an unlocked state or a locked state by turning the unlocking key.

[0061] Specifically, such as Figure 2 As shown, Figure 2 include Figure 2 a and Figure 2 b, where Figure 2 a is a structural diagram of the first program lock component in the unlocked state. Figure 2 b is a schematic diagram of the structure of the first program lock component in the locked state. Figure 2 a and Figure 2 As shown in FIG. 2 , the first program lock assembly 12 includes a telescopic member 121 and a lock hole 120. The telescopic member 121 is in an extended position when the first program lock assembly is in a locked state, and in a retracted position when the first program lock assembly is in an unlocked state. The lock hole 120 is used for inserting an unlocking key (not shown in the figure). The telescopic member 121 is used for connecting with a first limiting member (not shown in the figure) to unlock or lock the first interlocking assembly 13 through the first limiting member. Figure 2 In the unlocked state shown in a, the unlocking key cannot be pulled out. Figure 2 In the locked state shown in b, the unlocking key can be pulled out.

[0062] Under the premise that the telescopic member 121 is not constrained, the first program lock assembly 12 can be locked by turning the unlocking key, thereby locking the first interlocking assembly 13 to lock the circuit breaker trolley 10 in the corresponding test position and enable the unlocking key to be pulled out.

[0063] In one embodiment, the circuit breaker trolley can have corresponding static and dynamic frames, connected by specific dynamic and static rails that can be used for guidance and positioning. A first interlocking assembly 13 is used to advance or retract the corresponding dynamic frame relative to the corresponding static frame, allowing the circuit breaker trolley to reach the corresponding test position or operating position. In this embodiment, the static frame has a front frame bar, and the first interlocking assembly 13 and the first program lock assembly 12 are both mounted on the front frame bar. This allows the operator to operate the circuit breaker trolley without having to touch the circuit breaker and achieve separation from live parts.

[0064] Figure 3 This is a structural schematic diagram of a circuit breaker trolley in a test position and a first program lock assembly in a locked state according to an embodiment of the present application. Figure 4 yes Figure 3 Structural diagram of the circuit breaker trolley in the test position and the first program lock assembly in the unlocked state. Figure 5 This is a cross-sectional view of a circuit breaker trolley in a test position and a first program lock assembly in a locked state according to an embodiment of the present application.

[0065] like Figure 3 Shown and Figure 4 As shown, a first slot 121 a is provided on the first limiting member 122 , and the slot opening faces the direction of the first program lock assembly 13 , and a locking position 121 b is provided at the bottom of the first slot 121 a .

[0066] like Figure 5 As shown, the first interlocking assembly 13 is provided with a movable operating socket 131 for inserting a movable unlocking member, which depresses and unlocks the first interlocking assembly 13, thereby allowing the corresponding movable frame to advance or retract relative to the corresponding static frame. A first stopper 122 extends toward the first interlocking assembly 13. When the first program lock assembly 12 is in the locked state, the first stopper 122 extends and blocks the downward pressure of the movable operating socket, thereby locking the first interlocking assembly.

[0067] In this way, it can be ensured that the isolation trolley 20 can be operated only when the circuit breaker trolley 10 is in the working position, thereby achieving the effect of preventing the isolating switch on the isolation trolley 20 from being separated by charge, and dual control of the first interlocking component can be achieved through the first limit member and the movable unlocking member to prevent the circuit breaker trolley from being operated outside the prescribed operation, thereby ensuring the safety of the operator and the equipment.

[0068] In one embodiment, the first stopper comprises a vertical plate and a horizontal plate fixedly connected to each other; the vertical plate is used to be fixedly connected to the telescopic member, and the horizontal plate has an open slot, i.e., a first latching slot, facing the first interlocking assembly. The latching slot has an upper latching wall and a lower latching wall, which respectively form upper and lower latching portions with the upper and lower edges of the horizontal plate. The upper and lower latching portions engage the moving operation socket 131 in the direction of travel to limit the movement of the circuit breaker cart. The thickness of the first stopper gradually decreases from the end connected to the telescopic member 121, thereby increasing the structural rigidity at the connection between the vertical and horizontal plates and facilitating the upper and lower latching portions of the horizontal plate to engage the moving operation socket 131 in the direction of travel.

[0069] like Figure 5 As shown, a first through hole is provided on the front frame bar 101 of the static frame. The first elastic locking member includes a first straight rod 111, a first elastic member 112, and a locking portion 113 provided at one end of the first straight rod 111 away from the first elastic member 112. The first straight rod 111 is movably inserted into the first through hole, and the first elastic member 112 is sleeved on the first straight rod. One end of the first elastic member 112 is fixed to the rear side wall of the front frame bar 101, and the other end is fixed to the first straight rod 111. The first elastic member 112 can be a spring. The locking portion is provided on the front side of the front frame bar 101. Figure 3 and Figure 4 When the first limiter 122 is in the extended position, the position of the locking portion 113 corresponds to the position of the locking portion 121b. When the circuit breaker trolley enters the corresponding test position, the movable frame 102 pushes the first straight rod 111 to push the locking portion out of the locking groove 121a, thereby releasing the constraint on the forward movement of the first limiter 122 and allowing the first limiter 122 to be extended when the unlocking key is turned. At this time, turning the unlocking key can cause the first program lock assembly to lock the first interlocking assembly and allow the unlocking key to be pulled out. In other words, Figure 4 Enter the state Figure 3 status.

[0070] Thus, when the circuit breaker trolley enters the corresponding test position, the first program lock assembly can be unlocked, so that it can be put into the locked state by operating the unlock key. Moreover, when the circuit breaker trolley is in the corresponding test position, the first program lock assembly can be put into the locked state by turning the unlock key, thereby locking the first interlocking assembly and maintaining the position of the circuit breaker trolley in the corresponding test position.

[0071] In one embodiment, when the first program lock assembly is in the unlocked state and the circuit breaker leaves the corresponding test position, the first elastic member rebounds, driving the first locking portion to retract into the slot, thereby locking the first program lock assembly by blocking the extension of the first limit member, thereby preventing the operator from operating the isolation trolley when the circuit breaker trolley is in the swing-in or swing-out or working position.

[0072] In some embodiments, the first interlocking component includes a transmission screw, a nut and a pressure-bearing movable plate; through holes corresponding to each other are distributed on the front end frame bar and the movable frame for the transmission screw to pass through; the inner wall of the through hole corresponding to the movable frame is provided with a thread matching the outer wall of the transmission screw to convert the rotational motion of the transmission screw into the linear motion of the movable frame; the nut is sleeved on the transmission screw and fixed on the front end frame bar; the nut has a first pipe section and a second pipe section, the outer contour of the first pipe section is circular, the outer contour of the second pipe section is polygonal, and the distance between any point on the outer contour of the second pipe section and the center of the nut is greater than or equal to the radius of the first pipe section; the first pipe section is located on the side of the nut close to the front end frame bar; the pressure-bearing movable plate is fixed on the front end frame bar and movably sleeved on the second pipe section; a movable operation socket is formed on the outer side of the pressure-bearing movable plate; when the unlocking member is inserted into the movable operation socket, and the pressure-bearing movable plate is pressed down and movably sleeved on the first pipe section, the first interlocking component is unlocked.

[0073] In some embodiments, the first interlocking assembly further includes a positioning plate; at least one of the drive screw, nut, and pressure-bearing movable plate is secured to the front frame bar via the positioning plate; when the circuit breaker trolley is in the corresponding test position, the first extending member extends between the pressure-bearing movable plate and the positioning plate to prevent the pressure-bearing movable plate from pressing downward, thereby locking the first interlocking assembly. Thus, the positioning plate increases structural rigidity, making the installation of the first interlocking assembly more stable and easier to rock in and out.

[0074] Figure 6 This is a structural schematic diagram of an isolation trolley in a corresponding working position according to an embodiment of the present application. Figure 7 This is a structural schematic diagram of an isolation trolley not in a corresponding working position according to an embodiment of the present application.

[0075] like Figure 6 and Figure 7 As shown, the isolation trolley further includes a second interlocking assembly 23 and a second elastic locking member 21. The second interlocking assembly 23 is used to enable the isolation trolley to reach the corresponding test position or working position. The second interlocking assembly 23 can adopt the same structure as the first interlocking assembly.

[0076] When the isolation trolley is located at the corresponding working position, the second elastic locking member 21 unlocks the second program lock assembly 22 so that the second program lock assembly 22 can enter a locked state and the unlocking key can be pulled out.

[0077] Figure 8 FIG is a schematic structural diagram of a second elastic locking member according to an embodiment of the present application. Figure 8 As shown, the second elastic locking member 21 includes a second straight rod 212 and a second elastic member 213. The second elastic member is sleeved onto the second straight rod, with one end of the second elastic member fixed to the corresponding stationary frame of the isolation trolley and the other end fixed to the second straight rod. The second straight rod is movably inserted into the corresponding stationary frame and the corresponding moving frame of the isolation trolley. The second straight rod has an escape portion 214 on one end located on the corresponding stationary frame and a limit stop 215 on the other end.

[0078] Similar to the first program lock assembly, the second program lock assembly 22 includes an extendable second stopper with a second slot formed therein, which faces the second interlocking assembly. When the isolation trolley enters the corresponding working position, the corresponding movable frame pulls the second straight rod 212 via the stopper 215, positioning the escape portion 214 in the second slot, thereby reserving space for the second stopper to extend.

[0079] like Figure 6 As shown, when the isolation trolley is in the corresponding working position and the avoidance portion 214 is in the second engaging slot, turning the unlocking key extends the second limiter, thereby extending and locking the second interlocking assembly and allowing the unlocking key to be removed. This allows the circuit breaker trolley to be operated while the isolation trolley is in the corresponding working position, ensuring that the operating procedures comply with the operating regulations of the high-voltage switchgear.

[0080] like Figure 7 As shown, when the isolation trolley leaves the corresponding working position, the second elastic member rebounds, driving the avoidance portion away from the second slot and causing the second straight rod to engage the slot, thereby preventing the second limit member from extending and retaining the unlocking key in the second program lock assembly. This prevents the unlocking key from being removed when the isolation trolley is not in the corresponding working position, making it impossible to operate the circuit breaker trolley in other non-working positions. This ensures that the isolation trolley is in the corresponding working position when the circuit breaker trolley is operated.

[0081] Figure 9 This is an operational flow chart of disconnecting the busbar of a high-voltage switchgear according to an embodiment of the present application. Figure 9 As shown, in this embodiment, the operation method of disconnecting the mother coupling cabinet specifically includes the following steps.

[0082] Step S901: Pull the circuit breaker trolley to the test position corresponding to the circuit breaker trolley, and lock the first program lock component so that the circuit breaker trolley cannot move;

[0083] Step S902: Pull out the unlocking key;

[0084] Step S903: insert the unlocking key into the second program lock assembly on the isolation trolley, and move the isolation trolley into the corresponding test position through the second interlocking assembly.

[0085] Figure 10 This is an operation flow chart of the closing busbar cabinet of the high-voltage switchgear provided in accordance with an embodiment of the present application. Figure 10 As shown, in this embodiment, the operation method of closing the main coupling cabinet mainly includes the following steps.

[0086] Step S904: Pull the isolation trolley to the corresponding working position and lock the second program lock assembly so that the isolation trolley cannot move;

[0087] Step S905: Pull out the unlocking key;

[0088] Step S906: insert the unlocking key into the first program lock assembly on the circuit breaker trolley, and move the circuit breaker trolley into the corresponding working position through the first interlocking assembly.

[0089] In this way, it can be ensured that the isolation trolley cannot be operated when the circuit breaker trolley is moving or in the working position, and it can also be ensured that the circuit breaker trolley can only be returned to the working position after the isolation trolley is pushed back to the working position, thereby achieving the effect of preventing the isolating switch from being separated by electric charge.

[0090] Although the present application has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary rather than restrictive. Since the present application can be embodied in various forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all changes and modifications that fall within the scope of the claims or their equivalents are intended to be covered by the appended claims.

Claims

1. An interlocking device for a high-voltage switchgear, characterized in that: The high-voltage switch cabinet includes a circuit breaker cabinet and an isolation cabinet. A circuit breaker trolley is installed inside the circuit breaker cabinet, and an isolation trolley is installed inside the isolation cabinet. The interlocking device includes: a first interlocking assembly, mounted on the circuit breaker trolley, for moving the circuit breaker trolley so as to enable the circuit breaker trolley to reach a test position or a working position corresponding to the circuit breaker trolley; a first program lock assembly, the first program lock assembly being fixed to the circuit breaker trolley; the first program lock assembly having an unlocking key, and the first program lock assembly being placed in an unlocked state or a locked state by turning the unlocking key to unlock or lock the first interlocking assembly; the unlocking key can be removed only when the first program lock assembly is in the locked state; a first elastic locking member fixed to the circuit breaker trolley and used to unlock or lock the first program lock assembly; when the circuit breaker trolley reaches the corresponding test position, the circuit breaker trolley compresses the first elastic locking member to cause the first elastic locking member to pop out and unlock the first program lock assembly, so that the first program lock assembly can be put into the locked state by rotating the unlocking key; when the first program lock assembly is in the locked state, the first interlocking assembly can be locked to lock the circuit breaker trolley in the corresponding test position and enable the unlocking key to be removed; A second program lock assembly is mounted on the isolation trolley; the second program lock assembly and the first program lock assembly share the unlocking key, so that the isolation trolley can be moved by the unlocking key only when the circuit breaker trolley is held in the corresponding test position, thereby preventing the isolation switch on the isolation trolley from being separated by electric charge; The circuit breaker trolley has a corresponding static frame and a movable frame, and the first interlocking assembly is used to make the corresponding movable frame move forward or backward relative to the corresponding static frame, so that the circuit breaker trolley reaches the corresponding test position or working position; The static frame has a front frame bar; the first interlocking component and the first program lock component are both arranged on the front frame bar; The first program lock assembly includes a first limiting member, the first limiting member having an extended position corresponding to when the first program lock assembly is in a locked state and a retracted position corresponding to when the first program lock assembly is in an unlocked state; The first interlocking component is provided with a movable operation socket, and the movable operation socket is used for inserting a movable unlocking member to unlock the first interlocking component; The first limiting member extends toward the direction of the first interlocking component; when the first program lock component is in a locked state, the first limiting member extends and blocks the movable operating socket to lock the first interlocking component.

2. The interlocking device for high-voltage switchgear according to claim 1, characterized in that: The first limiting member is provided with a first card slot, with the slot opening facing the first program lock assembly, and a card position is provided at the bottom of the first card slot; A first through hole is formed in the front frame bar; the first elastic locking member includes a first straight rod and a first elastic member; the first straight rod is movably inserted into the first through hole; the first elastic member is sleeved on the first straight rod, and one end of the first elastic member is fixed to the rear side wall of the front frame bar, and the other end is fixed to the first straight rod; a locking portion is provided at the end of the first straight rod facing away from the first elastic member; when the first limiting member is in the extended position, the position of the locking portion corresponds to the position of the locking position; When the circuit breaker trolley enters the corresponding test position, the movable frame pushes the first straight rod to push the locking portion out of the locking position.

3. The interlocking device for high-voltage switchgear according to claim 2, characterized in that: When the circuit breaker trolley is located at the corresponding test position, the first program lock assembly can be put into the locked state and the first interlocking assembly can be locked by turning the unlocking key.

4. The interlocking device for high-voltage switchgear according to claim 2, characterized in that: When the first program lock assembly is in the unlocked state and the circuit breaker leaves the corresponding test position, the first elastic member rebounds, driving the locking portion to reach the first locking groove, so that the locking portion blocks the extension of the first limiting member to lock the first program lock assembly.

5. The interlocking device for a high-voltage switchgear according to any one of claims 1 to 4, characterized in that: The isolation trolley further comprises a second interlocking assembly and a second elastic locking member, wherein the second interlocking assembly is used to enable the isolation trolley to reach a corresponding test position or a working position; The second elastic locking member is used to unlock the second program lock assembly when the isolation trolley is located at the corresponding working position, so that the second program lock assembly can enter a locked state and the unlocking key can be pulled out.

6. The interlocking device for high-voltage switchgear according to claim 5, characterized in that: The second elastic locking member includes a second straight rod and a second elastic member; the second elastic member is sleeved on the second straight rod, and one end of the second elastic member is fixed to the static frame corresponding to the isolation trolley, and the other end is fixed to the second straight rod; the second straight rod is movably inserted into the static frame and the corresponding dynamic frame corresponding to the isolation trolley, and the second straight rod is provided with an avoidance portion at one end located on the corresponding static frame and a limit baffle at the other end; The second program lock assembly has an extendable second limit piece, and a second card slot facing the second chain assembly is formed on the second limit piece; when the isolation trolley enters the corresponding working position, the corresponding moving frame pulls the second straight rod through the limit baffle and places the avoidance portion in the second card slot.

7. The interlocking device for high-voltage switchgear according to claim 6, characterized in that: When the isolation trolley is located at the corresponding working position, the second limiting member can be extended by rotating the unlocking key, thereby locking the second interlocking assembly and allowing the unlocking key to be pulled out.

8. The interlocking device for high-voltage switchgear according to claim 6, characterized in that: When the isolation trolley leaves the corresponding working position, the second elastic member rebounds and drives the avoidance portion to leave the second slot, and causes the second straight rod to be stuck in the slot to prevent the second limit member from extending and allow the unlocking key to stay in the second program lock assembly.

9. A high voltage switch cabinet, characterized in that: The high-voltage switchgear has the interlocking device for a high-voltage switchgear according to any one of claims 1 to 8.

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