Back-front door interlock of gas insulated metal enclosed switchgear
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BEIJING SOJO ELECTRIC CO LTD
- Filing Date
- 2026-03-11
- Publication Date
- 2026-06-12
Smart Images
Figure CN122202085A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of electrical equipment technology, and more particularly to a rear-front door interlocking system for a gas-insulated metal-enclosed switchgear. Background Technology
[0002] During the operation of a power system, the safe and stable operation of switching equipment is directly related to the reliability of power grid supply and the personal safety of maintenance personnel. Among them, gas-insulated metal-enclosed switchgear (C-GIS) is widely used in various power scenarios due to its small size and excellent insulation performance. Its safety is directly related to the stable power supply of the power system and the personal safety of maintenance personnel.
[0003] The core operating mechanisms of gas-insulated metal-enclosed switchgear (C-GIS) include the circuit breaker and the three-position isolating mechanism. The safety of their coordinated operation directly determines the overall operational safety of the equipment. According to the "five-prevention" standard, clear interlocking constraints must be met: when the circuit breaker is in the closed position, the three-position isolating mechanism must not perform closed isolation or closed grounding operations; when the three-position isolating mechanism is in the open position or during closed grounding operations, the circuit breaker must remain open and is prohibited from closing; the front door of the cable compartment may only be opened when the three-position isolating mechanism is in the closed position and the circuit breaker is in the closed position, and before the energized compartment is grounded.
[0004] However, the existing door interlocking mechanisms of switchgear still have the drawbacks of being prone to misoperation and having a relatively complex structure. In addition, the existing door interlocking mechanisms of switchgear usually involve the rear door lock and the front door lock being unlocked or locked separately, which is quite troublesome to operate. Summary of the Invention
[0005] This invention provides a rear-front door interlock for a gas-insulated metal-enclosed switchgear, which solves the problem that the rear-front door interlock of existing gas-insulated metal-enclosed switchgear is still prone to misoperation, and effectively prevents misoperation.
[0006] This invention provides a rear and front door interlock for a gas-insulated metal-enclosed switchgear, including an interlocking limiter, a tension spring, a lifting transmission assembly, a rotating crank arm, a rear door lock, a support, a door connecting rod, a limit block, a front door lock, a circuit breaker crank arm, and a tripping stop plate. The interlocking limiter slides with one of the support rods of the three-position isolation mechanism and is at least partially located between the isolation slider and the rear mounting plate of the three-position isolation mechanism. A tension spring connects the interlocking limiter to the front mounting plate of the three-position isolation mechanism. The lifting transmission assembly can be moved up and down and is mounted on the circuit breaker. When the circuit is closed, the interlocking limiter abuts against the upper end of the lifting transmission assembly to restrict the downward movement of the lifting transmission assembly. When the circuit is grounded, the isolation slider of the three-position isolation mechanism pushes the interlocking limiter to separate from the upper end of the lifting transmission assembly. The circuit breaker crank arm is mounted on the main shaft of the circuit breaker and is used to abut against the lifting transmission assembly when the circuit breaker is open. The circuit breaker stop plate is mounted on the lifting transmission assembly and is used to abut against the circuit breaker's ... The rear door lock is used to lock the rear compartment door of the ring main unit. The support is installed inside the ring main unit. The door linkage is movably inserted into the support. The limit block is installed on the door linkage. The support is located between the limit block and the rear door lock and there is a gap between the support and the limit block. One end of the rotating crank arm is connected to the lower end of the lifting transmission assembly through a rotating shaft. The other end of the rotating crank arm is connected to the support through a rotating shaft. The rotating crank arm is located between the limit block and the support. When power is supplied, the lifting transmission assembly moves upward to drive the rotating crank arm to rotate until the side abuts against the side of the limit block. When grounding is under maintenance, the lifting transmission assembly moves downward to drive the rotating crank arm to rotate until it separates from the limit block. The front door lock is used to lock the front compartment door of the ring main unit. The rear door lock and the front door lock are respectively connected to both ends of the door linkage. The door linkage is used to unlock or lock the rear door lock and the front door lock.
[0007] In addition, the rear-front door interlock of the gas-insulated metal-enclosed switchgear according to the present invention may also have the following additional technical features: In some embodiments of the present invention, a front locking plate is also included. The front locking plate is installed on the front door of the ring main unit. The front door lock includes a front abutment plate, a front lock hook, and a front abutment member. The front abutment plate is installed on the front door of the ring main unit. A transition hole is formed between the front abutment plate and the front locking plate. The front lock hook is connected to the door linkage through a pivot. The front abutment member is installed on the front lock hook and abuts against the front abutment plate. When the front door lock is locked, the front locking plate engages with the front lock hook, and the front abutment member is inserted into the transition hole.
[0008] In some embodiments of the present invention, the rear door lock includes a rear lock hook, a rear lock body, and a rear abutment bracket. The rear lock body is installed on the rear compartment door of the ring main unit. The rear lock hook is connected to the door connecting rod by a pivot. One end of the rear lock hook is provided with an inclined surface. The rear abutment bracket is installed on the ring main unit and abuts against the inclined surface. A slot is opened on the rear lock hook. A rear lock block is fixedly installed at the end of the rear lock body. When the rear door lock is locked, the rear lock block is inserted into the slot.
[0009] In some embodiments of the present invention, a tripping pressure plate and a main shaft baffle are also included. The tripping pressure plate is installed on the tripping coil drive shaft of the circuit breaker. The tripping baffle and the main shaft baffle are installed vertically and horizontally on the lifting transmission assembly. When the circuit is closed, the tripping baffle and the tripping pressure plate abut against each other to restrict the rotation of the tripping coil drive shaft of the circuit breaker. When the circuit is opened, the main shaft baffle abuts against the upper end of the crank arm of the circuit breaker.
[0010] In some embodiments of the present invention, the rear lock body includes a rear lock block, a rear connecting seat, and a rear lock handle. The rear connecting seat is installed on the rear compartment door of the ring main unit. One end of the rear lock block is connected to the rear connecting seat, and the rear lock block is fixedly installed on the other end of the rear lock block. The upper end of the rear lock handle is connected to the rear connecting seat through a rotating shaft.
[0011] In some embodiments of the present invention, the lifting transmission assembly includes a lifting rod and a lifting limit plate, and the interlocking limit component includes an interlocking frame and an interlocking limit plate. The interlocking frame is slidably mounted on one of the support rods of the three-position isolation mechanism and is at least partially located between the isolation slider and the rear mounting plate of the three-position isolation mechanism. A tension spring is connected between the interlocking frame and the front mounting plate of the three-position isolation mechanism. The interlocking limit plate is fixedly connected to the interlocking frame. The lifting rod is movable up and down on the circuit breaker, and the lifting limit plate is mounted on the upper end of the lifting rod. When the circuit is closed, the lifting limit plate overlaps with the interlocking limit plate to restrict the lifting rod from moving downward. When the circuit is grounded, the isolation slider of the three-position isolation mechanism drives the interlocking frame to move, which in turn drives the interlocking limit plate to move until it separates from the lifting limit plate.
[0012] In some embodiments of the present invention, the interlocking frame includes a first connecting plate, a second connecting plate, a limiting plate, and a third connecting plate. The first connecting plate and the second connecting plate are respectively fixedly installed at the left and right ends of the third connecting plate. The limiting plate is installed at the upper end of the third connecting plate, and the interlocking limiting plate is installed at the lower end of the third connecting plate. The first connecting plate and the second connecting plate are both slidably connected to one of the support rods of the three-station isolation mechanism. The limiting plate abuts against the isolation slider of the three-station isolation mechanism and is located between the isolation slider of the three-station isolation mechanism and the rear mounting plate. A tension spring is connected between the first connecting plate and the front mounting plate of the three-station isolation mechanism.
[0013] In some embodiments of the present invention, an interlocking bracket is also included. The interlocking bracket is installed at the upper end of the circuit breaker. The upper end of the lifting rod passes through the circuit breaker and the interlocking bracket in sequence. A lifting limit plate is installed in front of the lifting rod. An adjustment hole is provided on the interlocking bracket. The lifting transmission assembly also includes a lifting adjustment rod, which passes through an adjustment hole and is fixedly connected to the lifting rod, and the lifting adjustment rod can move up and down relative to the interlocking bracket.
[0014] In some embodiments of the present invention, a connecting plate, a vertical connecting rod, and a connecting block are also included. One end of the connecting plate is connected to the lower end of the lifting rod via a rotating shaft, and the connecting block is connected to the other end of the connecting plate via a rotating shaft. The upper end of the vertical connecting rod is fixedly connected to the connecting block, and the lower end of the vertical connecting rod is connected to the rotating crank arm via a rotating shaft.
[0015] In some embodiments of the present invention, the lifting transmission assembly further includes a support plate and a lifting connecting plate. The support plate is fixedly installed inside the ring main unit, and the middle part of the connecting plate is connected to the support plate through a rotating shaft. The lifting connecting plate is installed at the lower end of the lifting rod, and the connecting plate is connected to the lifting connecting plate through a rotating shaft.
[0016] In summary, this application includes the following beneficial technical effects: Through the coordinated arrangement of the rear door lock, door linkage, front door lock, rotating crank arm, support, limit block, lifting transmission assembly, tripping stop plate, circuit breaker crank arm, interlocking limit component, and tension spring, the three-position isolation mechanism is prohibited from performing isolation or grounding operations when the circuit breaker is in the closed state; during the operation of the three-position isolation mechanism in the open position or grounding operation, the circuit breaker must remain open and is prohibited from closing; the cable compartment rear front door can only be opened when the three-position isolation mechanism is in the closed position and the circuit breaker is in the closed position, and before the energized room is grounded; furthermore, the door interlocking structure is relatively simple, and the mechanical blocking by the limit block and rotating crank arm ensures good interlocking reliability; moreover, this mechanical interlock adopts a purely mechanical structure without electrical components, avoiding the risk of accidental triggering and effectively preventing safety hazards caused by misoperation and equipment failure. At the same time, this interlock achieves synchronous locking and unlocking of the rear door lock and the front door lock, making operation more convenient. Attached Figure Description
[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A first perspective view of a gas-insulated metal-enclosed switchgear according to some embodiments of the present invention is shown schematically.
[0018] Figure 2 A partial enlarged view of part I of a first perspective view of a gas-insulated metal-enclosed switchgear with a front and rear door interlock according to some embodiments of the present invention is shown schematically.
[0019] Figure 3 Part II of a partially enlarged view of a first perspective view of a gas-insulated metal-enclosed switchgear with a front and rear door interlock according to some embodiments of the present invention is shown schematically.
[0020] Figure 4 Part III of a partially enlarged view of a first perspective view of a gas-insulated metal-enclosed switchgear with a front and rear door interlock according to some embodiments of the present invention is shown schematically.
[0021] Figure 5A second perspective view of a gas-insulated metal-enclosed switchgear according to some embodiments of the present invention is shown schematically.
[0022] Figure 6 A partial enlarged view of part I of a second perspective view of a gas-insulated metal-enclosed switchgear with a front and rear door interlock according to some embodiments of the present invention is shown schematically.
[0023] Figure 7 A partial enlarged view of part II of a second perspective view of a gas-insulated metal-enclosed switchgear with a front and rear door interlock according to some embodiments of the present invention is shown schematically.
[0024] Figure 8 A third perspective view of a gas-insulated metal-enclosed switchgear according to some embodiments of the present invention is shown schematically.
[0025] Figure 9 A partial enlarged view of part I of the third perspective view of a gas-insulated metal-enclosed switchgear with a front and rear door interlock according to some embodiments of the present invention is shown schematically.
[0026] Figure 10 A perspective view schematically illustrating the connection between the front locking hook and the front stop of the rear-front door interlock of a gas-insulated metal-enclosed switchgear according to some embodiments of the present invention is shown.
[0027] Figure 11 A first perspective view schematically illustrating the connection between the rear and front door interlocking of a gas-insulated metal-enclosed switchgear according to some embodiments of the present invention and the circuit breaker, the three-position isolation mechanism, and the front compartment door.
[0028] Figure 12 The diagram schematically shows a partial enlarged view of part I of a first perspective view of a gas-insulated metal-enclosed switchgear according to some embodiments of the present invention, showing the connection between the rear and front door interlocking and the circuit breaker, the three-position isolation mechanism, and the front compartment door.
[0029] Figure 13 Part II of a partial enlarged view of a first perspective view of a gas-insulated metal-enclosed switchgear according to some embodiments of the present invention is shown. The view shows the connection between the rear and front door interlocking and the circuit breaker, the three-position isolation mechanism and the front compartment door.
[0030] Figure 14 The diagram schematically shows a second perspective view of the connection between the rear and front door interlocking of a gas-insulated metal-enclosed switchgear according to some embodiments of the present invention and the circuit breaker, the three-position isolation mechanism, and the front compartment door.
[0031] Figure 15The diagram schematically shows a partial enlarged view of part I of a second perspective view of a gas-insulated metal-enclosed switchgear according to some embodiments of the present invention, showing the connection between the rear and front door interlocking and the circuit breaker, the three-position isolation mechanism, and the front compartment door.
[0032] Figure 16 A partial enlarged view of part II of a second perspective view of a gas-insulated metal-enclosed switchgear according to some embodiments of the present invention is shown. The view shows the connection between the rear and front door interlocking and the circuit breaker, the three-position isolation mechanism and the front compartment door.
[0033] Figure 17 A schematic diagram of the front compartment door of a gas-insulated metal-enclosed switchgear with rear-front door interlocking is shown according to some embodiments of the present invention.
[0034] Figure 18 A partially enlarged view schematically illustrates the structure of the front compartment door of a gas-insulated metal-enclosed switchgear with rear-front door interlocking according to some embodiments of the present invention.
[0035] Figure 19 A schematic plan view of a gas-insulated metal-enclosed switchgear according to some embodiments of the present invention is shown, showing a front and rear door interlock mounted on the switchgear and with a partially concealed housing.
[0036] Figure 20 A partially enlarged plan view schematically illustrating a gas-insulated metal-enclosed switchgear according to some embodiments of the present invention, wherein the rear and front door interlock is mounted on the switchgear and the partial housing is concealed.
[0037] Figure label: Interlocking limiting component, 11, interlocking frame, 111, first connecting plate, 112, second connecting plate, 113, limiting plate, 114, third connecting plate, 12, tension spring, 13, interlocking limiting plate; Lifting transmission assembly, 21. Lifting limit plate, 22. Rotating crank arm, 221. Crank arm notch, 23. Opening pressure plate, 231. Opening baffle, 24. Main shaft baffle, 241. Circuit breaker crank arm, 25. Lifting rod; 3. Rear door lock; 31. Rear lock hook; 311. Groove; 32. Rear lock body; 321. Rear lock block; 322. Rear connecting seat; 323. Rear lock handle; 324. Rear lock block; 33. Rear stop bracket. 4. Interlocking bracket base; 41. Adjustment hole; 411. First arc hole; 412. Transition strip hole; 413. Second arc hole; 5. Lifting and adjusting rod; 51. Connecting rod; 52. Adjusting shaft; 6. Support; 61. Door connecting rod; 62. Limit block; 63. Support plate; 64. Lifting connecting plate; 7. Front door lock; 71. Front latch plate; 711. Latch hole; 72. Front stop plate; 73. Front lock hook; 731. Rotating body; 732. Hook body; 74. Front stop piece; 741. Transition hole. 8. Connecting plate; 81. Vertical connecting rod; 82. Connecting block; 9. Three-position isolation mechanism; 91. Support rod; 92. Front mounting plate; 93. Isolation slider; 94. Rear mounting plate; 95. Isolation operation lever; 96. Grounding operation hole. 10. Circuit breaker; 101. Energy storage operating lever; 102. Energy storage indicator hole; 103. Main shaft; 104. Closing button; 105. Opening button. Detailed Implementation
[0038] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
[0039] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” used herein may also refer to the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a specific order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.
[0040] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.
[0041] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, then an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below..." can include both upper and lower orientations. The device may also be rotated 90 degrees or in other orientations, and the spatial relative descriptors used in the text will be interpreted accordingly.
[0042] like Figures 1 to 20 As shown, according to an embodiment of the first aspect of the present invention, a rear and front door interlock of a gas-insulated metal-enclosed switchgear is provided, including an interlocking limiter 1, a tension spring 12, a lifting transmission assembly 2, a rotating crank arm 22, a rear door lock 3, a support 6, a door connecting rod 61, a limit block 62, a front door lock 7, a circuit breaker crank arm 241, and a tripping baffle 231. The interlocking limiter 1 is slidably engaged with one of the support rods 91 of the three-position isolation mechanism 9 and is at least partially located between the isolation slider 93 and the rear mounting plate 94 of the three-position isolation mechanism 9. A tension spring 12 is connected between the interlocking limiter 1 and the front mounting plate 92 of the three-position isolation mechanism 9. The lifting transmission assembly 2 can be moved up and down and is mounted on the circuit breaker 10. When the circuit is closed, the interlocking limiter 1 abuts against the upper end of the lifting transmission assembly 2 to restrict the lifting transmission assembly 2 from moving downward. When the circuit is grounded, the isolation slider 93 of the three-position isolation mechanism 9 pushes the interlocking limiter 1 to separate it from the upper end of the lifting transmission assembly 2. The circuit breaker crank arm 241 is mounted on the main shaft 103 of the circuit breaker 10 and is used to abut against the lifting transmission assembly 2 when the circuit breaker is open. The opening stop plate 231 is mounted on the lifting transmission assembly 2 and is used to abut against the opening coil drive shaft of the circuit breaker 10 when the circuit breaker is closed to limit the rotation of the opening coil drive shaft of the circuit breaker 10. The rear door lock 3 is used to lock the rear compartment door of the ring main unit. The support 6 is installed inside the ring main unit. The door connecting rod 61 is movably inserted into the support 6. The limit block 62 is installed on the door connecting rod 61. The support 6 is located between the limit block 62 and the rear door lock 3 and has a gap between it and the limit block 62. One end of the rotating crank arm 22 is connected to the lower end of the lifting transmission assembly 2 through a rotating shaft. The other end of the rotating crank arm 22 is connected to the support 6 through a rotating shaft. The rotating crank arm 22 is located between the limit block 62 and the support 6. When power is supplied, the lifting transmission assembly 2 moves upward to drive the rotating crank arm 22 to rotate until it abuts against the side of the limit block 62. When grounding is inspected, the lifting transmission assembly 2 moves downward to drive the rotating crank arm 22 to rotate until it separates from the limit block 62. The front door lock 7 is used to lock the front compartment door of the ring main unit. The rear door lock 3 and the front door lock 7 are respectively connected to both ends of the door linkage 61. The door linkage 61 is used to unlock or lock the rear door lock 3 and the front door lock 7.
[0043] In the above embodiment, it should be noted that the rotating crank arm 22 is provided with a crank arm notch 221. When power is supplied, the bottom wall of the crank arm notch 221 abuts against the door connecting rod 61 so that the side of the rotating crank arm 22 and the side of the limiting block 62 come into contact with each other.
[0044] The above at least part refers to the fact that at least part of the structure of the interlocking limiter 1 is located between the isolation slider 93 and the rear mounting plate 94 of the three-position isolation mechanism 9.
[0045] The working principle of this mechanical interlock is as follows: When power needs to be supplied: In the initial state, both the circuit breaker 10 and the three-position isolation mechanism 9 are in the open position. At this time, the isolation operation lever 95 of the three-position isolation mechanism 9 is moved to avoid the isolation operation hole. Then, the isolation handle of the three-position isolation mechanism 9 is rotated clockwise to move the isolation slider 93 of the three-position isolation mechanism 9 to the isolation closing position. At the same time, the movement of the isolation slider 93 causes the tension spring 12 to shorten, which moves the interlocking limiter 1 to the position where it abuts against the lifting transmission assembly 2 to restrict the lifting transmission assembly 2 from moving up and down. At this time, the lifting transmission assembly 2 cannot move down. Then, the energy storage operation lever 101 of the circuit breaker 10 is operated. When the energy storage indicator hole 102 of the circuit breaker 10 shows "energy stored", the closing button 104 of the circuit breaker 10 is pressed to perform the closing operation. The circuit breaker 10 is closed.
[0046] When maintenance is required, press the trip button 105 of circuit breaker 10. Then, the interlocking limit plate between circuit breaker 10 and three-position isolation mechanism 9 opens, releasing the limit on the isolation operation lever 95 of three-position isolation mechanism 9. Then, move the isolation mechanism operation lever on the three-position isolation mechanism to open the isolation operation hole, and then rotate the isolation handle until the three-position isolation mechanism 9 is in the trip position. Then, continue to move the isolation mechanism operation lever of the three-position isolation mechanism 9 to open the grounding operation hole 96, and then rotate the grounding handle to move the isolation slider 93 of the three-position isolation mechanism 9 to the grounding position. At the same time, the movement of the isolation slider 93 moves the interlocking limit member 1 to a position separated from the lifting transmission assembly 2, and the energy storage operation of circuit breaker 10 is operated. When the energy storage indicator hole 102 on rod 101 displays "energy stored", press the closing button 104 of circuit breaker 10 to close circuit breaker 10. The main shaft 103 of circuit breaker 10 drives the circuit breaker crank arm 241 to rotate downward to avoid the lifting transmission assembly 2. At this time, the lifting transmission assembly 2 can move downward to drive the rotating crank arm 22 to rotate until it is separated from the limit block 62 and drives the tripping plate 231 to move to the state of abutting against the tripping coil drive shaft of circuit breaker 10. Circuit breaker 10 cannot perform tripping operation and the limit block 62 can move towards the rear door of the ring main unit. The movement of the limit block 62 can drive the door connecting rod 61 to move, and the rear door lock 3 is unlocked. At the same time, the movement of the door connecting rod 61 drives the front door lock 7 to unlock. Both the rear door and the front door can be opened.
[0047] When it is necessary to restore to the initial state, maintenance is completed. Close the rear and front doors of the ring main unit, move the lifting transmission assembly 2 upward, and drive the rotating crank arm 22 to rotate to the position where the side abuts against the side of the limit block 62. The door linkage 61 cannot move, and both the rear door lock 3 and the front door lock 7 are locked. Neither the rear nor the front door of the ring main unit can be opened. The tripping baffle 231 moves upward with the lifting transmission assembly 2 to avoid the tripping coil drive shaft of the circuit breaker 10, allowing the circuit breaker 10 to perform tripping operations. At this time, the interlocking limit plate between the circuit breaker 10 and the three-position isolation mechanism 9 opens to release the limit on the isolation operation lever 95 of the three-position isolation mechanism 9. Move the isolation operation lever 95 of the three-position isolation mechanism to open the grounding operation hole 96, and then rotate the grounding handle to trip the isolation mechanism. At this time, both the circuit breaker 10 and the three-position isolation mechanism 9 are in the tripping position.
[0048] It should be noted that the purpose of closing the circuit breaker 10 during maintenance is to form a grounding circuit and prevent residual electrical energy before opening from causing the risk of electric shock during maintenance.
[0049] The technical effects achieved by the above embodiments are as follows: Through the coordinated arrangement of the rear door lock 3, door connecting rod 61, front door lock 7, rotating crank arm 22, support 6, limit stop 62, lifting transmission assembly 2, tripping stop 231, circuit breaker crank arm 241, interlocking limit component 1, and tension spring 12, the three-position isolation mechanism 9 is prohibited from performing isolation or grounding operations when the circuit breaker 10 is in the closed state; during the operation of the three-position isolation mechanism 9 in the open position or grounding operation, the circuit breaker 10 must remain open and is prohibited from closing; only when the three-position isolation mechanism 9 is in the open position... The cable compartment front door can only be opened after structure 9 is in the closed position, circuit breaker 10 is in the closed position, and the energized room has been grounded. In addition, the interlocking structure of this door is relatively simple. The mechanical blocking of limit block 62 and rotating crank arm 22 makes the interlocking reliability of this interlocking good. Furthermore, this mechanical interlock adopts a pure mechanical structure without electrical components, avoiding the risk of accidental triggering and effectively preventing safety hazards caused by misoperation and equipment failure. At the same time, this interlock realizes the synchronous locking and unlocking of rear door lock 3 and front door lock 7, making operation more convenient.
[0050] Optional, such as Figure 1 , Figure 4 , Figure 8 , Figure 10 as well as Figures 16 to 18 As shown, it also includes a front locking plate 71, which is installed on the front door of the ring main unit. The front door lock 7 includes a front abutment plate 72, a front lock hook 73, and a front abutment member 74. The front abutment plate 72 is installed on the front door of the ring main unit, and a transition hole 741 is formed between the front abutment plate 72 and the front locking plate 71. The front lock hook 73 is connected to the door connecting rod 61 through a pivot. The front abutment member 74 is installed on the front lock hook 73 and abuts against the front abutment plate 72. When the front door lock 7 is locked, the front locking plate 71 is engaged with the front lock hook 73, and the front abutment member 74 is inserted into the transition hole 741.
[0051] In the above optional embodiments, it should be noted that the front lock hook 73 includes a rotating body 731 and a hook body 732. The rotating body 731 is connected to the door connecting rod 61 through a rotating shaft. The hook body 732 is installed on the rotating body 731 by welding or integral molding. The front stop 74 is installed on the rotating body 731 by welding or integral molding. The hook body 732 and the front stop 74 are located on opposite sides of the rotating body 731, and the included angle between the hook body 732 and the front stop 74 is an obtuse angle. A locking hole 711 is formed between the front locking plate 71 and the front compartment door. When the front door lock 7 is locked, the front locking plate 71 and the hook body 732 are engaged, and the hook body 732 is inserted into the locking hole 711.
[0052] Optional, such as Figure 1 , Figure 5 , Figure 7 and Figure 8As shown, the rear door lock 3 includes a rear lock hook 31, a rear lock body 32, and a rear abutment bracket 33. The rear lock body 32 is installed on the rear compartment door of the ring main unit. The rear lock hook 31 is connected to the door connecting rod 61 by a pivot. One end of the rear lock hook 31 is provided with an inclined surface. The rear abutment bracket 33 is installed on the ring main unit and abuts against the inclined surface. The rear lock hook 31 is provided with a slot 311. The end of the rear lock body 32 is fixedly installed with a rear lock block 324. When the rear door lock 3 is locked, the rear lock block 324 is inserted into the slot 311.
[0053] In the above optional embodiments, it should be noted that the locking principle of the rear door lock 3 and the front door lock 7 is as follows: After locking, first close the front compartment door of the ring main unit, then close the rear compartment door of the ring main unit. When the rear compartment door of the ring main unit is closed, the rear lock block 321 can move the door connecting rod 61 toward the front compartment door of the ring main unit as the rear compartment door moves, causing the rear lock hook 31 to rotate to a horizontal state, while the rear lock block 324 is inserted into the slot 311, and the rear door lock 3 is locked. As the door linkage 61 moves, it drives the rear lock hook 31 to rotate, which in turn drives the front lock hook 73 and the front stop 74 to move toward the front door. Due to the gravity of the hook body 732 of the front lock hook 73 and the blocking effect of the front stop 72, the hook body 732 of the front lock hook 73 will gradually rotate downward until it engages with the front stop plate 71 and is inserted into the stop hole 711, thus locking the front door lock 7.
[0054] The advantages of the above optional embodiments are: the coordinated arrangement of the door linkage 61, the front latch plate 71, the front stop 74, the front stop plate 72 and the front lock hook 73 enables the rear door lock 3 and the front door lock 7 to be locked or unlocked simultaneously, thereby increasing the convenience of operation.
[0055] Optional, such as Figures 1 to 3 , Figure 5 , Figure 8 and Figure 13 As shown, it also includes a tripping plate 23 and a main shaft baffle 24. The tripping plate 23 is installed on the tripping coil drive shaft of the circuit breaker 10. The tripping baffle 231 and the main shaft baffle 24 are installed on the lifting transmission assembly 2 at intervals. When closing, the tripping baffle 231 and the tripping plate 23 abut against each other to restrict the rotation of the tripping coil drive shaft of the circuit breaker 10. When opening, the main shaft baffle 24 abuts against the upper end of the circuit breaker crank arm 241.
[0056] In the above optional embodiments, it should be noted that the tripping pressure plate 23 is connected to the tripping coil drive shaft of the circuit breaker 10 by means of bolt connection or welding, and the tripping baffle 231 and the main shaft baffle 24 are both installed on the lifting transmission assembly 2 by means of bolt connection or welding.
[0057] The advantages of the above optional embodiments are: by setting the tripping pressure plate 23 and the tripping baffle 231, the situation of incorrect tripping or incorrect closing caused by misoperation can be effectively avoided, thereby improving safety performance.
[0058] Optional, such as Figure 1 , Figure 5 , Figure 7 and Figure 8 As shown, the rear lock body 32 includes a rear lock block 321, a rear connecting seat 322, and a rear lock handle 323. The rear connecting seat 322 is installed on the rear compartment door of the ring main unit. One end of the rear lock block 321 is connected to the rear connecting seat 322. The rear lock block 324 is fixedly installed on the other end of the rear lock block 321. The upper end of the rear lock handle 323 is connected to the rear connecting seat 322 through a pivot.
[0059] In the above optional embodiments, it should be noted that part of the structure of the rear lock handle 323 is exposed on the outside of the rear compartment door.
[0060] Optional, such as Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 8 , Figure 9 , Figure 14 and Figure 15 As shown, the lifting transmission assembly 2 includes a lifting rod 25 and a lifting limit plate 21. The interlocking limit component 1 includes an interlocking frame 11 and an interlocking limit plate 13. The interlocking frame 11 is slidably mounted on one of the support rods 91 of the three-position isolation mechanism 9 and is at least partially located between the isolation slider 93 and the rear mounting plate 94 of the three-position isolation mechanism 9. A tension spring 12 is connected between the interlocking frame 11 and the front mounting plate 92 of the three-position isolation mechanism 9. The interlocking limit plate 13 is fixedly connected to the interlocking frame 11. The lifting rod 25 is movably mounted on the circuit breaker 10. The lifting limit plate 21 is mounted on the upper end of the lifting rod 25. When the circuit is closed, the lifting limit plate 21 and the interlocking limit plate 13 overlap to restrict the lifting rod 25 from moving downward. When the circuit is grounded, the isolation slider 93 of the three-position isolation mechanism 9 drives the interlocking frame 11 to move and the interlocking limit plate 13 to move until it is separated from the lifting limit plate 21.
[0061] In the above optional embodiments, it should be noted that the interlocking frame 11 and the interlocking limit plate 13 are integrally bent and formed; the tripping baffle 231 and the main shaft baffle 24 are installed on the lifting rod 25 at intervals.
[0062] The beneficial effects of the above optional embodiments are as follows: the coordinated arrangement of the lifting rod 25, the lifting limit plate 21, the interlocking frame 11 and the interlocking limit plate 13 ensures the reliability of the lifting limit component in restricting the downward movement of the lifting transmission assembly 2.
[0063] Optional, such as Figure 5 and Figure 6 As shown, the interlocking frame 11 includes a first connecting plate 111, a second connecting plate 112, a limiting plate 113, and a third connecting plate 114. The first connecting plate 111 and the second connecting plate 112 are respectively fixedly installed at the left and right ends of the third connecting plate 114. The limiting plate 113 is installed at the upper end of the third connecting plate 114, and the interlocking limiting plate 13 is installed at the lower end of the third connecting plate 114. The first connecting plate 111 and the second connecting plate 112 are slidably connected to one of the support rods 91 of the three-station isolation mechanism 9. The limiting plate 113 abuts against the isolation slider 93 of the three-station isolation mechanism 9 and is located between the isolation slider 93 of the three-station isolation mechanism 9 and the rear mounting plate 94. A tension spring 12 is connected between the first connecting plate 111 and the front mounting plate 92 of the three-station isolation mechanism 9.
[0064] In the above optional embodiments, it should be noted that the first connecting plate 111, the second connecting plate 112, the limiting plate 113 and the third connecting plate 114 are integrally bent and formed. The first connecting plate 111 and the second connecting plate 112 are each provided with hexagonal holes and are slidably sleeved on one of the support rods 91 of the three-position isolation mechanism 9 through the hexagonal holes.
[0065] Optional, such as Figure 1 , Figure 2 , Figure 5 , Figure 8 and Figure 9 As shown, it also includes an interlocking bracket 4, which is installed on the upper end of the circuit breaker 10. The upper end of the lifting rod 25 passes through the circuit breaker 10 and the interlocking bracket 4 in sequence and is then fitted with a lifting limit plate 21. An adjustment hole 41 is provided on the interlocking bracket 4. The lifting transmission assembly 2 also includes a lifting adjustment rod 5, which passes through the adjustment hole 41 and is fixedly connected to the lifting rod 25. The lifting adjustment rod 5 can move up and down relative to the interlocking bracket 4.
[0066] In the above optional embodiments, it should be noted that the interlocking bracket 4 is installed on the circuit breaker 10 by means of bolt connection or snap-fit, etc. The adjustment hole 41 includes a first arc hole 411, a transition strip hole 412 and a second arc hole 413 connected sequentially from top to bottom. The diameter of the first arc hole 411 is equal to the diameter of the second arc hole 413 and is greater than the width of the transition strip hole 412. One end of the lifting adjustment rod 5 is connected to the lifting rod 25 by a bearing. When the rear door lock 3 and the front door lock 7 are locked, the other end of the lifting adjustment rod 5 is inserted into the position of the second arc hole 413. When the rear door lock 3 and the front door lock 7 are unlocked, the other end of the lifting adjustment rod 5 is inserted into the position of the first arc hole 411.
[0067] The lifting adjustment rod 5 includes a connecting rod 51 and an adjusting shaft 52. One end of the connecting rod 51 is connected to the lifting connecting rod through a bearing. The adjusting shaft 52 is welded to or integrally formed with the other end of the connecting rod 51. When the rear door lock 3 and the front door lock 7 are locked, the adjusting shaft 52 is inserted at the position of the second arc hole 413. When the rear door lock 3 and the front door lock 7 are locked, the adjusting shaft 52 is inserted at the position of the first arc hole 411. The cross-sectional shape of the connecting rod 51 can be rectangular, with the width of the rectangle being less than the width of the transition strip hole 412 and the length being greater than the width of the transition strip hole 412 and less than the diameter of the first arc hole 411. Alternatively, the four sides of the connecting rod 51 can be two opposing arc surfaces and two opposing planes, respectively. The distance between the two opposing arc surfaces is greater than the distance between the two opposing planes, the distance between the two opposing planes is less than the width of the transition strip hole 412, and the maximum distance between the two opposing arc surfaces is greater than the width of the transition strip hole 412 and less than the diameter of the first arc hole 411.
[0068] The beneficial effects of the above optional embodiments are as follows: the interlocking bracket 4 and the lifting adjustment rod 5 ensure the controllability and reliability of the lifting rod 25, thereby ensuring the reliability of locking and unlocking of the rear door lock 3 and the front door lock 7.
[0069] Optional, such as Figure 1 , Figure 4 , Figure 5 and Figure 8 As shown, it also includes a connecting plate 8, a vertical connecting rod 81, and a connecting block 82. One end of the connecting plate 8 is connected to the lower end of the lifting rod 25 via a rotating shaft. The connecting block 82 is connected to the other end of the connecting plate 8 via a rotating shaft. The upper end of the vertical connecting rod 81 is fixedly connected to the connecting block 82. The lower end of the vertical connecting rod 81 is connected to the rotating crank arm 22 via a rotating shaft.
[0070] In the above optional embodiments, it should be noted that the upper end of the vertical connecting rod 81 is screwed or welded to the connecting block 82.
[0071] The advantages of the above optional embodiments are that the reliability of the operation of the rotating crank arm 22 is ensured by the arrangement of the connecting plate 8, the vertical connecting rod 81 and the connecting block 82.
[0072] Optional, such as Figure 1 , Figure 4 , Figure 5 and Figure 8 As shown, the lifting transmission assembly 2 also includes a support plate 63 and a lifting connecting plate 64. The support plate 63 is fixedly installed inside the ring main unit. The middle part of the connecting plate 8 is connected to the support plate 63 through a rotating shaft. The lifting connecting plate 64 is installed at the lower end of the lifting rod 25. The connecting plate 8 is connected to the lifting connecting plate 64 through a rotating shaft.
[0073] In the above optional embodiments, it should be noted that the support plate 63 is installed inside the ring main unit by bolts.
[0074] The advantages of the above optional embodiments are: the cooperative arrangement of the support plate 63 and the lifting connecting plate 64 ensures the reliability of the rotation of the connecting plate 8.
[0075] In summary, as Figures 1 to 20 As shown, the working principle of this door interlock is as follows: When power needs to be supplied: In the initial state, both the circuit breaker 10 and the three-position isolation mechanism 9 are in the open position. At this time, the isolation operation lever 95 of the three-position isolation mechanism 9 is moved to avoid the isolation operation hole. Then, the isolation handle of the three-position isolation mechanism 9 is rotated clockwise to move the isolation slider 93 of the three-position isolation mechanism 9 to the isolation closing position. At the same time, the movement of the isolation slider 93 causes the tension spring 12 to shorten, which moves the interlocking frame 11 and the interlocking limit plate 13 to the position where it overlaps with the lifting limit plate 21 to restrict the lifting rod 25 from moving downward. At this time, the lifting rod 25 cannot move downward. Then, the energy storage operation lever 101 of the circuit breaker 10 is operated. When the energy storage indicator hole 102 of the circuit breaker 10 shows "energy stored", the closing button 104 of the circuit breaker 10 is pressed to perform the closing operation. The circuit breaker 10 is closed.
[0076] When maintenance is required, press the trip button 105 of circuit breaker 10. Then, the interlock limit plate between circuit breaker 10 and three-position isolation mechanism 9 opens, releasing the limit on the isolation operation lever 95 of three-position isolation mechanism 9. Then, move the isolation mechanism operation lever on the three-position isolation mechanism to open the isolation operation hole, and then rotate the isolation handle until the three-position isolation mechanism 9 is in the trip position. Then, continue to move the isolation operation lever 95 of the three-position isolation mechanism 9 to open the grounding operation hole 96, and then rotate the grounding handle to drive the isolation of the three-position isolation mechanism 9. The slider 93 moves to the grounding position; simultaneously, the movement of the isolating slider 93 drives the interlocking frame 11 to move, causing the interlocking limit plate 13 to move to a position separated from the lifting limit plate 21. When the energy storage operating lever 101 of the circuit breaker 10 displays "energy stored" on the energy storage indicator hole 102, the closing button 104 of the circuit breaker 10 is pressed to perform the closing operation of the circuit breaker 10. The main shaft 103 of the circuit breaker 10 drives the circuit breaker crank arm 241 to rotate downward until the main shaft baffle 24 separates from the circuit breaker crank arm 241. At this time, the lifting rod 25 can move downward. The movement of the tripping stop plate 231 causes it to abut against the tripping pressure plate 23, preventing the circuit breaker 10 from tripping. The lifting rod 25 moves downwards, causing the connecting plate 8 to rotate, which in turn causes the vertical connecting rod 81 to move downwards, rotating the crank arm 22. Then, the crank arm 22 rotates until it separates from the limit block 62, allowing the limit block 62 to move towards the rear door of the ring main unit. The limit block 62 moves to a position coinciding with the crank arm notch 221. At this point, the limit block 62 abuts against the bottom wall of the crank arm notch 221 of the crank arm 22, preventing the lifting transmission assembly 2 from tripping. When the door moves upward, even if the circuit breaker is accidentally operated, it cannot be closed when the door is open. As a result, the door linkage 61 can move towards the rear compartment door. The movement of the door linkage 61 drives the rear lock hook 31 to move and rotate downward due to gravity, disengaging from the rear lock body 32. The rear door lock 3 is unlocked, and the rear compartment door of the ring main unit can be opened. At the same time, due to the action of the front abutment plate 72 on the front abutment member 74, the movement of the door linkage 61 can also drive the front lock hook 73 to gradually rotate upward until the hook body 732 is separated from the front locking plate 71. The front door lock 7 is unlocked, and the front compartment door of the ring main unit can be opened.
[0077] When it is necessary to restore to the initial state, the maintenance is completed. First, close the front compartment door of the ring main unit, and then close the rear compartment door of the ring main unit. When the rear compartment door of the ring main unit is closed, the rear lock block 321 can move the door connecting rod 61 towards the front compartment door of the ring main unit as the rear compartment door moves. This causes the rear lock hook 31 to rotate to a horizontal state, while the rear lock block 324 is inserted into the slot 311, and the rear door lock 3 is locked. As the door linkage 61 moves, it drives the rear lock hook 31 to rotate, which in turn drives the front lock hook 73 and the front stop 74 to move toward the front door. Due to the gravity of the hook body 732 of the front lock hook 73 and the blocking effect of the front stop 72, the hook body 732 of the front lock hook 73 will gradually rotate downward until it engages with the front stop plate 71 and is inserted into the stop hole 711, thus locking the front door lock 7.
[0078] Then, move the lifting adjustment rod 5 upward to the position where the lifting adjustment is inserted into the second arc hole 413. The upward movement of the lifting adjustment rod 5 drives the lifting rod 25 upward, which in turn drives the connecting plate 8 to rotate, causing the vertical connecting rod 81 to move upward. This can drive the rotating crank arm 22 to rotate to the position where its side abuts against the side of the limit stop block 62. At this time, the door connecting rod 61 cannot move, and neither the rear door lock 3 nor the front door lock 7 can be unlocked. The rear compartment door and the front compartment door of the ring main unit cannot be opened. At the same time, the... The stop plate 231 moves upward with the lifting rod 25 to avoid the tripping pressure plate 23, and the circuit breaker 10 can perform the tripping operation. At this time, the interlocking limit plate between the circuit breaker 10 and the three-position isolation mechanism 9 opens to release the limit on the isolation operation lever 95 of the three-position isolation mechanism 9. The isolation operation lever 95 of the three-position isolation mechanism is moved to open the grounding operation hole 96, and then the grounding handle is rotated to trip the three-position isolation mechanism 9. At this time, both the circuit breaker 10 and the three-position isolation mechanism 9 are in the tripping position.
[0079] It should be clarified here that the rear and front doors of the ring main unit are existing structures on the ring main unit and will not be explained in detail here; the interlocking limit plate between the circuit breaker 10 and the three-position isolation mechanism 9, the isolation operation lever 95, grounding handle, grounding operation hole 96, support rod 91, isolation slider 93, front mounting plate 92, rear mounting plate 94 and other structures on the three-position isolation mechanism 9; as well as the energy storage operation lever 101, energy storage indicator hole 102, main shaft 103, closing button 104, and opening button 105 of the circuit breaker 10 are all existing structures, and their specific structures will not be explained in detail here.
[0080] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.
Claims
1. A rear-front door interlocking system for a gas-insulated, metal-enclosed switchgear, characterized in that, It includes interlocking limit component (1), tension spring (12), lifting transmission assembly (2), rotating crank arm (22), rear door lock (3), support (6), door connecting rod (61), limit block (62), front door lock (7), circuit breaker crank arm (241) and tripping plate (231). The interlocking limiting member (1) is slidably engaged with one of the support rods (91) of the three-position isolation mechanism (9) and is at least partially located between the isolation slider (93) and the rear mounting plate (94) of the three-position isolation mechanism (9). A tension spring (12) is connected between the interlocking limiting member (1) and the front mounting plate (92) of the three-position isolation mechanism (9). The lifting transmission assembly (2) can be moved up and down on the circuit breaker (10). When the circuit is closed, the interlocking limiting member (1) abuts against the upper end of the lifting transmission assembly (2) to restrict the lifting transmission assembly (2) from moving downward. When the circuit is grounded, the isolation slider (93) of the three-position isolation mechanism (9) pushes the interlocking limiting member (1) to separate from the upper end of the lifting transmission assembly (2). The circuit breaker crank arm (241) is mounted on the main shaft (103) of the circuit breaker (10) and is used to abut against the lifting transmission assembly (2) when the circuit breaker is opened. The opening baffle (231) is mounted on the lifting transmission assembly (2) and is used to abut against the opening coil drive shaft of the circuit breaker (10) when the circuit breaker is closed to limit the rotation of the opening coil drive shaft of the circuit breaker (10). The rear door lock (3) is used to lock the rear compartment door of the ring main unit. The support (6) is installed inside the ring main unit. The door connecting rod (61) is movably inserted into the support (6). The limiting block (62) is installed on the door connecting rod (61). The support (6) is located between the limiting block (62) and the rear door lock (3) and has a gap with the limiting block (62). One end of the rotating crank arm (22) is connected to the lower end of the lifting transmission assembly (2) through a rotating shaft. The other end of the rotating crank arm (22) is connected to the support (6) via a rotating shaft. The rotating crank arm (22) is located between the limiting block (62) and the support (6). When power is supplied, the lifting transmission assembly (2) moves upward to drive the rotating crank arm (22) to rotate until its side abuts against the side of the limiting block (62). When grounding is being repaired, the lifting transmission assembly (2) moves downward to drive the rotating crank arm (22) to rotate until it separates from the limiting block (62). The front door lock (7) is used to lock the front compartment door of the ring network cabinet. The rear door lock (3) and the front door lock (7) are respectively connected to the two ends of the door linkage (61). The door linkage (61) is used to unlock or lock the rear door lock (3) and the front door lock (7).
2. The rear and front door interlock of the gas-insulated metal-enclosed switchgear according to claim 1, characterized in that, It also includes a front locking plate (71), which is installed on the front compartment door of the ring main unit; the front door lock (7) includes a front abutment plate (72), a front lock hook (73) and a front abutment member (74), the front abutment plate (72) is installed on the front compartment door of the ring main unit, a transition hole (741) is formed between the front abutment plate (72) and the front locking plate (71), the front lock hook (73) is connected to the door connecting rod (61) through a rotating shaft, and the front abutment member (74) is installed on the front lock hook (73) and abuts against the front abutment plate (72); when the front door lock (7) is locked, the front locking plate (71) is engaged with the front lock hook (73), and the front abutment member (74) is inserted into the transition hole (741).
3. The rear and front door interlock of the gas-insulated metal-enclosed switchgear according to claim 1, characterized in that, The rear door lock (3) includes a rear lock hook (31), a rear lock body (32), and a rear stop bracket (33). The rear lock body (32) is installed on the rear compartment door of the ring main unit. The rear lock hook (31) is connected to the door connecting rod (61) by a pivot. One end of the rear lock hook (31) is provided with an inclined surface. The rear stop bracket (33) is installed on the ring main unit and abuts against the inclined surface. The rear lock hook (31) is provided with a slot (311). The end of the rear lock body (32) is fixedly installed with a rear lock block (324). When the rear door lock (3) is locked, the rear lock block (324) is inserted into the slot (311).
4. The rear and front door interlock of the gas-insulated metal-enclosed switchgear according to claim 1, characterized in that, It also includes a tripping plate (23) and a main shaft baffle (24). The tripping plate (23) is installed on the tripping coil drive shaft of the circuit breaker (10). The tripping baffle (231) and the main shaft baffle (24) are installed on the lifting transmission assembly (2) at intervals. When the circuit is closed, the tripping baffle (231) and the tripping plate (23) abut against each other to restrict the rotation of the tripping coil drive shaft of the circuit breaker (10). When the circuit is opened, the main shaft baffle (24) abuts against the upper end of the crank arm (241) of the circuit breaker.
5. The rear and front door interlock of the gas-insulated metal-enclosed switchgear according to claim 3, characterized in that, The rear lock body (32) includes a rear lock block (321), a rear connecting seat (322), and a rear lock handle (323). The rear connecting seat (322) is installed on the rear compartment door of the ring main unit. One end of the rear lock block (321) is connected to the rear connecting seat (322). The rear lock block (324) is fixedly installed on the other end of the rear lock block (321). The upper end of the rear lock handle (323) is connected to the rear connecting seat (322) through a pivot.
6. The rear and front door interlock of the gas-insulated metal-enclosed switchgear according to claim 4, characterized in that, The lifting transmission assembly (2) includes a lifting rod (25) and a lifting limit plate (21). The interlocking limit component (1) includes an interlocking frame (11) and an interlocking limit plate (13). The interlocking frame (11) is slidably installed on one of the support rods (91) of the three-position isolation mechanism (9) and is at least partially located between the isolation slider (93) and the rear mounting plate (94) of the three-position isolation mechanism (9). A tension spring (12) is connected between the interlocking frame (11) and the front mounting plate (92) of the three-position isolation mechanism (9). The interlocking limit plate (13) is fixedly connected to the interlocking frame (11). The lifting rod (25) is movable up and down on the circuit breaker (10). The lifting limit plate (21) is installed on the upper end of the lifting rod (25). When the circuit is closed, the lifting limit plate (21) and the interlocking limit plate (13) overlap to restrict the lifting rod (25) from moving downward. When the circuit is grounded, the isolation slider (93) of the three-position isolation mechanism (9) drives the interlocking frame (11) to move and drives the interlocking limit plate (13) to move until it is separated from the lifting limit plate (21).
7. The rear-front door interlock of the gas-insulated metal-enclosed switchgear according to claim 6, characterized in that, The interlocking frame (11) includes a first connecting plate (111), a second connecting plate (112), a limiting plate (113), and a third connecting plate (114). The first connecting plate (111) and the second connecting plate (112) are respectively fixedly installed at the left and right ends of the third connecting plate (114). The limiting plate (113) is installed at the upper end of the third connecting plate (114), and the interlocking limiting plate (13) is installed at the lower end of the third connecting plate (114). The first connecting plate (111) and the second connecting plate (112) are both slidably connected to one of the support rods (91) of the three-station isolation mechanism (9). The limiting plate (113) abuts against the isolation slider (93) of the three-station isolation mechanism (9) and is located between the isolation slider (93) of the three-station isolation mechanism (9) and the rear mounting plate (94). The tension spring (12) is connected between the first connecting plate (111) and the front mounting plate (92) of the three-station isolation mechanism (9).
8. The rear and front door interlock of the gas-insulated metal-enclosed switchgear according to claim 6, characterized in that, It also includes an interlocking bracket (4), which is installed on the upper end of the circuit breaker (10). The upper end of the lifting rod (25) passes through the circuit breaker (10) and the interlocking bracket (4) in sequence, and the lifting limit plate (21) is installed in front of it. The interlocking bracket (4) has an adjustment hole (41). The lifting transmission assembly (2) also includes a lifting adjustment rod (5), which passes through the adjustment hole (41) and is fixedly connected to the lifting rod (25), and the lifting adjustment rod (5) can move up and down relative to the interlocking bracket (4).
9. The rear and front door interlock of the gas-insulated metal-enclosed switchgear according to claim 6, characterized in that, It also includes a connecting plate (8), a vertical connecting rod (81) and a connecting block (82). One end of the connecting plate (8) is connected to the lower end of the lifting rod (25) via a rotating shaft. The connecting block (82) is connected to the other end of the connecting plate (8) via a rotating shaft. The upper end of the vertical connecting rod (81) is fixedly connected to the connecting block (82). The lower end of the vertical connecting rod (81) is connected to the rotating crank arm (22) via a rotating shaft.
10. The rear and front door interlock of the gas-insulated metal-enclosed switchgear according to claim 9, characterized in that, The lifting transmission assembly (2) also includes a support plate (63) and a lifting connecting plate (64). The support plate (63) is fixedly installed inside the ring main unit. The middle part of the connecting plate (8) is connected to the support plate (63) through a rotating shaft. The lifting connecting plate (64) is installed at the lower end of the lifting rod (25). The connecting plate (8) is connected to the lifting connecting plate (64) through a rotating shaft.