10kv integrated node ring main unit with lever mechanical interlocking mechanism

Abstract

The utility model belongs to the technical field of electric power switch equipment, disclose a 10kV integrated node ring main unit of lever type mechanical interlock mechanism. The ring main unit includes: the positive front of switch room is equipped with node unit mechanism, first electromagnetic lock subassembly, PT unit mechanism, second electromagnetic lock subassembly, first electromagnetic lock subassembly is installed on node unit mechanism, the node unit mechanism between rear upper door subassembly and cabinet body front part is provided with lever mechanical interlock subassembly for the operating mechanism across whole cabinet body space from the front, accurately transmits movement to the cabinet door lock on rear side. The utility model realizes the perfect combination of mechanical anti - mistake and electrical monitoring, both satisfy the highest safety standard, also have intelligent interface, be convenient for into distribution automation system. Mechanical structure is simple and direct, and the failure point is few, and the daily maintenance and debugging are more simple than the complex rope mechanism.

Description

Technical Field

[0001] This utility model belongs to the field of power switchgear technology, and in particular relates to a 10kV integrated node ring main unit with a lever-type mechanical interlocking mechanism. Background Technology

[0002] The 10kV integrated node-type ring main unit series products are the latest solution to solve the problem of uninterrupted and rapid grid connection in medium-voltage power restoration technology. Its design concept is to add a bypass (branch) closing station to the original ring main unit switch station, and design the bypass (branch) as a fast interface. The ring main unit will be installed at line concentration points, multi-line intersections, near key users, densely populated residential areas, etc., as the access point for distribution network power restoration equipment.

[0003] The 10kV integrated node-type ring main unit does not increase the number of incoming and outgoing ring main units, has no special requirements for cable network line design, and has its own branch node power control and quick-plug interface, which can perform uninterrupted power supply transfer without occupying the spare interval, greatly improving the efficiency of uninterrupted operation and reducing power outages for users; it can also provide test access points for the maintenance of ring main units and cables; it can also be combined with other node equipment (node ​​pole-mounted circuit breakers, node low-voltage distribution boxes, etc.) to form a distribution network emergency operation network, which, while gridding the distribution network, assists in the automation equipment to realize the grid management of the distribution network emergency operation area.

[0004] Based on the ease of on-site implementation, the product design is divided into two types: front-mounted and rear-mounted. The front-mounted type is mainly used when the equipment is placed against the wall and the rear door cannot be opened. The rear-mounted design can meet the requirements of mechanical "five protections" and electrical "five protections" for branch circuits while optimizing the size.

[0005] 10kV integrated node ring main units are key equipment in power distribution network systems and are widely used in industrial parks, urban residential areas, commercial centers, etc., as nodes for power distribution and control.

[0006] When the design scheme is a rear-mounted design, its core component, the power supply device—a gas box filled with insulating gases such as SF6 / dry air—is usually located at the rear of the cabinet, while the operating mechanism (such as the operating handle or electric mechanism of a three-position isolating / grounding switch, circuit breaker, or other similar device) is located at the front of the cabinet for easy operation.

[0007] To ensure operational safety and prevent accidental entry into energized compartments, the rear door of the ring main unit must have a reliable interlocking function. That is, the rear door can only be opened when the load switch / disconnecting switch inside the switch box is reliably grounded and the internal components are not energized; conversely, when the rear door is open, it should be impossible to perform closing and energizing operations on the ring main unit.

[0008] Existing technologies for interlocking the rear door of integrated node ring network cabinets mainly have the following solutions, each with its own significant drawbacks: (1) No interlocking device: Some products or cabinets that are simplified to reduce costs lack physical interlocking and rely solely on regulations and warning signs for management. This poses a great risk of misoperation and personal safety, and does not meet the requirements of power safety regulations.

[0009] (2) Electromagnetic lock interlocking: The controller judges the switch status (such as whether the grounding is in place) and then controls the power on and off of the electromagnetic lock to realize the unlocking and locking of the back door.

[0010] Disadvantages: Its reliability is highly dependent on the normal operation of the secondary circuit, control power supply, and electronic components. In the event of component failure, power failure of the control power supply, or signal acquisition error, the interlocking function may fail ("failing to lock when it should" or "failing to open when it should"), posing safety hazards or affecting normal operation and maintenance.

[0011] Soft interlock (pull rope interlock): A lock that uses a steel wire rope or nylon pull rope to transmit the movement of the front operating mechanism to the rear door. For example, patent: A novel gas cabinet rear door interlock device (publication number CN217182059U, publication date 20220812).

[0012] shortcoming: Poor reliability: The rope is at risk of elongation, deformation, wear or even breakage, which can lead to increased interlocking stroke error or direct failure.

[0013] Low precision: Rope transmission has idle stroke and elastic deformation, which makes it impossible to achieve precise and rigid interlocking point docking, and easily leads to incomplete interlocking.

[0014] Installation is complex: The ropes are laid over a long distance through the cabinet, the path is complex, the installation process is demanding, and the subsequent maintenance and adjustment are inconvenient. Utility Model Content

[0015] To overcome the problems existing in related technologies, the present invention discloses a 10kV integrated node ring main unit with a lever-type mechanical interlocking mechanism.

[0016] The technical solution is as follows: A 10kV integrated node ring main unit with a lever-type mechanical interlocking mechanism includes a cable compartment, a switch compartment, a mechanism compartment, a control box compartment, a rear upper door assembly, a rear lower door assembly, a control box panel, a mechanism compartment panel, and a cable compartment door; a node unit mechanism, a first electromagnetic lock assembly, a PT unit mechanism, and a second electromagnetic lock assembly are installed at the front of the switch compartment; a node switch and a disconnect switch are installed inside the switch compartment, and the node unit mechanism and the PT unit mechanism are installed outside the switch compartment; a sheet metal front plate, a sheet metal left side plate, a sheet metal right side plate, and a sheet metal rear wall plate are welded and installed in the switch compartment, and the interior is filled with insulating gas for insulation and arc extinguishing; there are nails inside the sheet metal front plate for installing the node switch and the disconnect switch; there are nails outside the sheet metal front plate for installing the node unit mechanism and the PT unit mechanism; the external mechanism and the internal switch are connected together by a dynamic fit. The first electromagnetic lock assembly is installed at the front of the node unit mechanism and locks the grounding operation hole of the node unit mechanism when energized. This ensures that when the circuit is energized, the electromagnetic lock is locked, and the grounding operation shaft of the node unit mechanism cannot be operated. The first electromagnetic lock assembly is an electrical interlock, and the lever mechanical interlock assembly is a mechanical interlock. The second electromagnetic lock assembly is installed at the front of the PT unit mechanism and locks the grounding operation hole of the PT unit mechanism when energized. The first electromagnetic lock assembly is installed on the node unit mechanism. A lever mechanical interlock assembly is provided between the rear upper door assembly and the node unit mechanism at the front of the cabinet to accurately transmit the movement from the front operating mechanism across the entire cabinet space to the rear cabinet door lock.

[0017] The cable compartment door is installed directly in front of the cable compartment. An interlocking device is designed between the cable compartment door and the PT unit mechanism. When the grounding switch of the PT unit mechanism is open or the load switch of the PT unit mechanism is closed, the cable compartment door cannot be opened.

[0018] An integrated node bushing is installed at the rear lower part of the switch compartment.

[0019] The first electromagnetic lock assembly consists of an electromagnetic lock, an electromagnetic lock bracket, a first electromagnetic lock rod, and an electromagnetic lock baffle, which are installed together by a fixed connection. The first electromagnetic lock assembly is designed at the front of the cabinet and is used for the grounding operation hole of the energized locking node unit mechanism. During normal operation, the power switch of the electromagnetic lock is in the closed state, the electromagnetic lock is energized and locked, and the grounding switch operation hole of the node unit mechanism is blocked. During emergency maintenance or emergency power supply, the power switch of the electromagnetic lock is opened, the electromagnetic lock is de-energized, and the electromagnetic lock is unlocked. When the lever on the electromagnetic lock is moved to the unlock position, the first electromagnetic lock lever and the electromagnetic lock stop plate are displaced to the left. At this time, the electromagnetic lock stop plate no longer blocks the grounding switch operation hole.

[0020] The rear upper door assembly consists of a rear upper door, a rear upper door handle, a rear door electromagnetic lock, a second electromagnetic lock rod, and a rear upper door interlocking bend plate; the rear upper door interlocking bend plate is designed with an interlocking bend plate slot.

[0021] The lever mechanical interlock assembly consists of a first vertical connecting rod, a first connecting plate, a first horizontal connecting rod, a vertical support plate, a second connecting plate, a second vertical connecting rod, a first vertical guide plate, a second horizontal connecting rod, a rotating shaft, a third connecting plate, a third horizontal connecting rod, a first horizontal guide plate, a fourth connecting plate, a lever bend plate, a vertical guide shaft, and a lever interlock. The lever interlock head is designed with a round hole at its end. After the upper door component is closed, the interlocking bend plate slot will press down on the upper edge of the lever interlock head. Under the interaction of the lever mechanical interlocking components, the baffle on the interlocking device will move downward. At this time, the grounding switch operating hole of the node unit mechanism is not blocked.

[0022] In normal operation, the rear upper door assembly is in the closed state, the rear door electromagnetic lock is energized and locked, and the second electromagnetic lock rod will extend out of the rear door electromagnetic lock and into the round hole at the end of the lever interlock head; the electromagnetic lock is energized, and the second electromagnetic lock rod locks the lever mechanical interlock assembly. When the power switch of the electromagnetic lock is in the open state, the electromagnetic lock is de-energized and unlocked. When the lever on the electromagnetic lock is moved to the unlock position, the second electromagnetic lock rod retracts into the rear door electromagnetic lock, and the rear upper door assembly is opened.

[0023] The first vertical link is fixedly connected to the interlocking device, which moves downward / upward when the rear upper door assembly is in the closed / open position; the first vertical link is fixedly connected to the first horizontal link through the first connecting plate, and the vertical support plate provides fixed support and guidance for the first horizontal link, and the vertical support plate is fixedly installed on the bottom plate of the mechanism chamber; the second vertical link is fixedly connected to the first horizontal link through the second connecting plate, and the first vertical guide plate provides vertical guidance for the second vertical link; A rotating shaft is provided on the left side plate of the cable compartment. Under the action of the rotating shaft, the second horizontal connecting rod rotates around the rotating shaft. The third horizontal connecting rod is fixedly connected to the second horizontal connecting rod through a third connecting plate. A square hole is designed in the partition plate of the cable compartment corresponding to the position of the third horizontal connecting rod. At the same time, a positioning shaft is designed on the first horizontal guide plate. The lever bending plate is fixedly connected to the third horizontal connecting rod through a fourth connecting plate. The vertical guide shaft fixes and guides the movement of the lever bending plate. Under the action of the vertical guide shaft, the lever bending plate moves vertically up and down.

[0024] The upper curved edge of the rear upper door is designed with a rear upper door strip hole, and the rear upper door moves up and down under the action of the rear upper door guide plate; The upper rear beam of the cable compartment is installed at the upper rear of the cable compartment. A rear upper beam interlocking plate is designed at the bend on one side of the upper rear beam. A round hole, i.e. a padlock hole, is designed at the end of the upper rear beam. When the upper rear door assembly is closed, the round hole at the end of the upper rear beam interlocking plate is exposed. The padlock can be used to lock the upper rear door assembly, and the upper rear door assembly cannot be opened.

[0025] The rear lower door assembly consists of the rear lower door, a latch bracket, a latch, and a rotating device, which are fixedly connected by welding or assembly.

[0026] Combining all the above technical solutions, the beneficial effects of this utility model are as follows: This invention solves the problem of "electrical dependence" of pure electromagnetic locks: it overcomes the problem of interlocking function failure caused by power failure or electronic malfunction, and provides a purely mechanical interlocking guarantee that does not rely on electrical energy.

[0027] The problem of "unreliability" of soft interlocking has been solved: overcoming the inherent mechanical defects of rope transmission such as low precision, easy deformation and short life, a mechanical transmission scheme with good transmission rigidity, accurate action and long service life has been designed.

[0028] The system achieves a higher level of security with "double insurance": In addition to providing reliable mechanical interlocks, how to integrate electromagnetic locks to form a dual interlocking mechanism that is "mechanical as the main component and electrical as the auxiliary component"? This ensures the absolute reliability of the basic mechanical interlocks and enables remote monitoring or more complex logic control through electrical signals, thereby improving the intelligence level and safety redundancy of the equipment.

[0029] A compact and efficient mechanism was designed to stably transmit motion accurately from the front operating mechanism across the entire cabinet space to the lever-type mechanical interlocking device on the rear cabinet door lock.

[0030] Multi-locking design: The mechanical baffle is equipped with padlock holes, allowing maintenance personnel to apply personal padlocks during maintenance to achieve physical isolation and meet the highest requirements for safe production. Attached Figure Description

[0031] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure; Figure 1 This is a schematic diagram of a 10kV integrated node ring main unit with a lever-type mechanical interlocking mechanism provided in this embodiment of the utility model; Figure 2 This is a diagram showing the connection between the mechanism chamber panel and other structures provided in this embodiment of the utility model; Figure 3 This is a schematic diagram showing the connection between the first electromagnetic lock assembly and other structures provided in this embodiment of the utility model; Figure 4This is an enlarged view of the structure of the first electromagnetic lock assembly provided in this embodiment of the present invention; Figure 5 This is a schematic diagram showing the connection between the interlocking device provided in this embodiment of the utility model and other structures; Figure 6 This is a schematic diagram showing the connection between the lever mechanical interlock assembly provided in this embodiment of the utility model and other structures; Figure 7 A partial enlarged view of the lever mechanical interlocking assembly provided in this embodiment of the utility model; Figure 8 This is a partial view of the connection between the lever interlock head, the electromagnetic lock rod, and the rear upper door interlocking bent plate provided in this embodiment of the utility model; Figure 9 This is a partially enlarged view of the connection between the lever interlock head, the electromagnetic lock rod, and the rear upper door interlocking bent plate provided in this embodiment of the utility model; Figure 10 This is a schematic diagram of the structure of the rear lower door assembly provided in this embodiment of the utility model; Figure 11 This is a schematic diagram showing the location of the integrated node sleeve provided in this embodiment of the utility model; Figure 12 This is a schematic diagram showing the connection between the rear door electromagnetic lock and other structures provided in this embodiment of the utility model; Figure 13 This is a schematic diagram showing the connection between the rear upper beam interlocking plate and other structures provided in this embodiment of the utility model; In the diagram: 1. Cable compartment; 2. Switch compartment; 3. Mechanism compartment; 4. Control box compartment; 5. Rear upper door assembly; 6. Rear lower door assembly; 610. Rear lower door; 620. Pin bracket; 630. Pin; 640. Rotating device; 7. Control box panel; 8. Mechanism compartment panel; 9. Cable compartment door; 10. Node unit mechanism; 11. First electromagnetic lock assembly; 110. Electromagnetic lock; 120. Electromagnetic lock bracket; 130. First electromagnetic lock rod; 140. Electromagnetic lock baffle; 12. PT unit mechanism; 13. Second electromagnetic lock assembly; 14. PT unit bushing; 15. PT cable; 16. Voltage transformer (PT); 17. Grounding switch operating shaft; 18. Interlocking device; 19. Lever mechanical interlocking assembly; 1901. First vertical connecting rod; 1902. First connecting plate; 1903. First horizontal connecting rod; 1904. Vertical support plate; 1905. Second connecting plate; 1906, Second vertical connecting rod; 1907, First vertical guide plate; 1908, Second horizontal connecting rod; 1909, Rotating shaft; 1920, Third connecting plate; 1921, Third horizontal connecting rod; 1922, First horizontal guide plate; 1923, Fourth connecting plate; 1924, Lever bent plate; 1925, Vertical guide shaft; 1926, Lever interlock head; 20, Mechanism chamber bottom plate; 21, Left side of cable chamber 21. Side panel; 22. Cable compartment partition; 23. Linkage crank arm; 24. Swing rod; 25. Rear door electromagnetic lock; 26. Second electromagnetic lock rod; 27. Rear upper door interlocking bend plate; 28. Interlocking bend plate slot; 29. ​​Integrated node sleeve; 30. Guide groove; 31. Rear upper door; 32. Rear upper door handle; 33. Rear upper door strip hole; 34. Padlock; 35. Cable compartment rear upper beam; 36. Rear upper beam interlocking plate; 37. Rear upper door guide plate. Detailed Implementation

[0032] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0033] Example 1: This utility model designs a rigid mechanical interlocking mechanism based on the lever transmission principle and organically combines it with an electromagnetic lock 110 to construct a mechatronic dual interlocking system for the rear door of a 10kV integrated node ring network cabinet. It also features a multi-locking point design: padlock holes are provided on the mechanical baffle, allowing maintenance personnel to apply personal padlocks during maintenance.

[0034] Specifically, such as Figures 1-2As shown, the 10kV integrated node ring main unit with lever-type mechanical interlocking mechanism provided in this embodiment of the utility model includes: cable compartment 1, switch compartment 2, mechanism compartment 3, control box compartment 4, upper rear door assembly 5, lower rear door assembly 6, control box panel 7, mechanism compartment panel 8, and cable compartment door 9.

[0035] The switch compartment 2 houses one contact switch and one disconnect switch. The exterior (front) of the switch compartment 2 contains a contact unit mechanism 10 and a PT unit mechanism 12. The switch compartment 2 is constructed of a sheet metal front panel, a sheet metal left side panel, a sheet metal right side panel, and a sheet metal rear panel, all welded together. The interior is filled with insulating gas for insulation and arc extinguishing. The front panel contains mounting pins for installing the contact switch and disconnect switch; the exterior of the front panel also contains mounting pins for installing the contact unit mechanism 10 and the PT unit mechanism 12. The external mechanisms are connected to the internal switches via a dynamic fit.

[0036] The first electromagnetic lock assembly 11 is installed at the front of the node unit mechanism 10. Its main function is to lock the grounding operation hole of the node unit mechanism 10 when it is energized. When this circuit is energized, the electromagnetic lock 110 is locked, and the grounding operation shaft of the node unit mechanism 10 cannot be operated. The first electromagnetic lock assembly 11 is an electrical interlock, while the lever mechanical interlock assembly 19 is a mechanical interlock, which achieves the higher safety requirement of "double insurance".

[0037] The second electromagnetic lock assembly 13 is installed at the front of the PT unit mechanism 12. Its main function is to energize and lock the grounding operation hole of the PT unit mechanism 12, achieving the "double insurance" safety requirement with the mechanical interlocking device on the PT unit mechanism 12 (not described in the case). The PT unit mechanism 12, the second electromagnetic lock assembly 13, and the lever mechanical interlocking assembly 19 are not structurally related.

[0038] A switch compartment 2 is installed above and behind cable compartment 1, and a mechanism compartment 3 is installed above and in front of cable compartment 1. Mechanism compartment 3 and switch compartment 2 are fixedly connected together. A control box compartment 4 is installed on top of mechanism compartment 3. Inside control box compartment 4 are various secondary components that control the various states of the ring main unit. Control box panel 7 is installed at the front of control box compartment 4, protecting the secondary components inside. Mechanism compartment panel 8 is installed at the front of mechanism compartment 3, and the two are fixed together by screws (not shown in the figure). Cable compartment door 9 is installed at the front of cable compartment 1, and cable compartment door 9 is connected to PT unit mechanism 12 (such as...). Figure 3 An interlocking device 18 is designed between the PT unit mechanism 12 and the load switch of the PT unit mechanism 12. When the grounding switch of the PT unit mechanism 12 is open or the load switch of the PT unit mechanism 12 is closed, the cable compartment door 9 cannot be opened to prevent accidental entry into the energized compartment.

[0039] This design scheme is a rear-insertion design for the integrated node cabinet. The integrated node sleeve 29 is installed at the lower rear of the switch chamber 2. For emergency power supply needs, the rear upper door assembly 5 and the rear lower door assembly 6 are installed at the rear of the cable chamber 1.

[0040] Integrated node sleeve 29 (e.g.) Figure 11 The core value of this system lies in providing a "plug-and-play" safe connection point, eliminating the risks and cumbersome procedures of temporarily disconnecting and connecting high-voltage busbars. The flexible high-voltage cable used for temporarily establishing power bypass channels features a standardized and safe "socket" integrated with the node bushing 29, achieving a fast, insulated, and sealed connection.

[0041] like Figure 3 As shown, the node unit mechanism 10, the first electromagnetic lock assembly 11, the PT unit mechanism 12, and the second electromagnetic lock assembly 13 are installed directly in front of the switch chamber 2.

[0042] like Figure 4 The first electromagnetic lock assembly 11 is mounted on the node unit mechanism 10. The first electromagnetic lock assembly 11 is assembled together by a fixed connection of an electromagnetic lock 110, an electromagnetic lock bracket 120, a first electromagnetic lock rod 130, and an electromagnetic lock baffle 140. One end of the grounding switch operating shaft 17 is connected to the electromagnetic lock baffle 140, and the other end is connected to the node unit mechanism 10. The grounding switch operating shaft 17 is part of the node unit mechanism 10, fixed to it, and used to control the closing or opening of the grounding of the node switch inside the switch chamber 2. The grounding switch operating shaft 17 is not a component of the first electromagnetic lock assembly 11; the first electromagnetic lock assembly 11 is an independent assembly, and the grounding switch operating shaft 17 is also an independent assembly. The first electromagnetic lock assembly 11 is simply installed at the front of the node unit mechanism 10 to achieve the function of electrical interlocking.

[0043] The first electromagnetic lock assembly 11 is designed on the operating mechanism side, i.e., the front of the cabinet. Its main function is to energize and lock the grounding operation hole of the node unit mechanism 10. The power supply of the electromagnetic lock 110 is independent and taken from the control box 4 of this circuit. When the integrated node-type ring main unit is running normally, the power switch of the electromagnetic lock 110 is in the closed state. At this time, the electromagnetic lock 110 is energized and locked, and the grounding switch operation hole of the node unit mechanism 10 is blocked and cannot be operated. During emergency maintenance or emergency power supply, the power switch of the electromagnetic lock 110 is opened, the electromagnetic lock is de-energized, and the electromagnetic lock 110 can be unlocked. When the lever on the electromagnetic lock 110 is moved to the unlock position, the first electromagnetic lock lever 130 and the electromagnetic lock baffle 140 are displaced to the left. At this time, the electromagnetic lock baffle 140 no longer blocks the grounding switch operation hole. This is only one interlock (this interlock is an electrical interlock). Whether the grounding switch can be operated also depends on whether the upper door assembly 5 is in the closed state. If the rear door assembly 5 is in the closed state, the grounding switch of the node unit mechanism 10 can be operated; if the rear door assembly 5 is in the open state, it cannot be operated.

[0044] A compact and efficient mechanism is designed between the rear upper door assembly 5 and the node unit mechanism 10 at the front of the cabinet. This mechanism can stably transmit motion accurately from the front operating mechanism across the entire cabinet space to the lever-type mechanical interlocking device 18 on the rear cabinet door lock. This interlocking device 18 is called the lever-type mechanical interlocking assembly 19. The interlocking device 18 is equipped with a linkage crank arm 23, and a swing rod 24 is movably mounted on the linkage crank arm 23. Figure 5 As shown; like Figure 12 As shown, the rear upper door assembly 5 consists of a rear upper door 31, a rear upper door handle 32, a rear door electromagnetic lock 25, a second electromagnetic lock rod 26, and a rear upper door interlocking bend plate 27. The rear upper door interlocking bend plate 27 is designed with an interlocking bend plate slot 28.

[0045] like Figure 7 As shown, the lever mechanical interlocking assembly 19 mainly consists of a first vertical connecting rod 1901 and (all the way to) a lever interlocking head 1926, with a round hole designed at the end of the lever interlocking head 1926.

[0046] After the upper door assembly 5 is closed, the interlocking bend plate slot 28 will press down on the upper edge of the lever interlock head 1926. Under the interaction of the lever mechanical interlock assembly 19, the baffle on the interlocking device 18 will move downward. At this time, the grounding switch operation hole of the node unit mechanism 10 is not blocked, and the grounding switch can be operated.

[0047] like Figures 6-9As shown. Under normal operating conditions, the rear upper door assembly 5 is in the closed state. The power supply for the rear door electromagnetic lock 25 is also taken from the control box 4 of this circuit. When the integrated node-type ring main unit is operating normally, the power switch of the electromagnetic lock is in the closed state, the rear door electromagnetic lock 25 is energized, and it is locked while energized. At this time, the second electromagnetic lock rod 26 will extend out of the rear door electromagnetic lock 25 and into the round hole at the end of the lever interlock head 1926. The electromagnetic lock is energized, and the second electromagnetic lock rod 26 locks the lever mechanical interlock assembly 19. Only when the power switch of the electromagnetic lock is in the open state, the electromagnetic lock is de-energized, and the electromagnetic lock can be unlocked. The lever on the electromagnetic lock can be moved to the unlock position, the second electromagnetic lock rod 26 will retract into the rear door electromagnetic lock 25, and the rear upper door assembly 5 can be opened. (This part describes a dual interlocking mechanism of "mechanical as the main component and electrical as the auxiliary component") The first vertical link 1901 is fixedly connected to the interlocking device 18, which moves downward / upward when the rear upper door assembly 5 is in the closed / open position. The first vertical link 1901 is fixedly connected to the first horizontal link 1903 via the first connecting plate 1902. The vertical support plate 1904 provides fixed support and guidance for the first horizontal link 1903 and is fixedly installed on the bottom plate 20 of the mechanism chamber. The second vertical link 1906 is fixedly connected to the first horizontal link 1903 via the second connecting plate 1905. The first vertical guide plate 1907 provides vertical guidance for the second vertical link 1906, which can only move up and down.

[0048] like Figure 6 , Figure 7 As shown, a rotating shaft 1909 is provided on the left side plate 21 of the cable compartment. Under the action of the rotating shaft 1909, the second horizontal connecting rod 1908 can rotate around it. The third horizontal connecting rod 1921 is fixedly connected to the second horizontal connecting rod 1908 through the third connecting plate 1920. The partition plate 22 in the cable compartment is designed with a square hole corresponding to the position of the third horizontal connecting rod 1921. At the same time, a positioning shaft is designed on the first horizontal guide plate 1922. Under the action of the two, the third horizontal connecting rod 1921 can move back and forth. The lever bending plate 1924 is fixedly connected to the third horizontal connecting rod 1921 through the fourth connecting plate 1923. The vertical guide shaft 1925 fixes and guides the lever bending plate 1924. Under the action of the vertical guide shaft 1925, the lever bending plate 1924 can only move vertically up and down.

[0049] The integrated node ring main unit is based on the PT cabinet, with an added bypass (branch) closing station, and the bypass (branch) is designed as a quick interface. The PT cabinet consists of a load switch and conductive components inside the switch compartment 2, and a PT unit mechanism 12, a second electromagnetic lock assembly 13, a PT unit bushing 14, a PT cable 15, and a voltage transformer (PT) 16 outside the switch compartment 2; for example... Figure 3 As shown; A PT (Power Transformer) cabinet is a unit in a ring main unit system specifically designed for receiving voltage signals. Its core function is to proportionally convert the system's high voltage to a standard low voltage for use in measurement, protection, monitoring, and metering.

[0050] like Figure 13 The upper curved edge of the rear upper door 31 is designed with a rear upper door strip hole 33. The rear upper door moves upward and downward under the action of the rear upper door guide plate 37. Moving upward opens it, and moving downward closes it. The cable compartment rear upper beam 35 is installed at the rear upper part of the cable compartment 1. The bend on one side of the cable compartment rear upper beam 35 is designed with a rear upper beam interlocking plate 36, and its end is designed with a round hole, i.e., a padlock hole. When the rear upper door assembly 5 is closed, the round hole at the end of the rear upper beam interlocking plate 36 is exposed. At this time, the padlock 34 can be used to lock it. At this time, the rear upper door assembly 5 cannot be opened unless the maintenance personnel open it with a special key. The purpose of this design is that, during normal operation, the rear upper door assembly 5 cannot be opened except under the interlock of the lever mechanical interlocking assembly 19 and the rear door electromagnetic lock 25. With this design, the addition of a padlock can achieve physical isolation, prevent accidental entry into the live compartment, and ensure the safety of maintenance personnel.

[0051] like Figure 10 As shown, the rear lower door assembly 6 is fixedly connected by welding or assembly of the rear lower door 610, the pin bracket 620, the pin 630, and the rotating device 640. The rotating device 640 is fixedly installed on the rear lower crossbeam of the cable chamber 1. When the rear lower door assembly 6 is closed, the pin rod on the pin 630 extends into the left side plate 21 of the cable chamber 1 and the right side plate (not shown in the figure) of the cable chamber.

[0052] Working Principle: The cabinet features a double-door design behind the cable compartment 1. A lever-operated mechanical interlock assembly 19 connects the upper rear door 31 to the integrated node mechanism at the front of the cabinet. When the upper rear door is closed, the interlock prevents the grounding switch operating hole from being blocked, allowing the operating handle to be inserted. When the upper rear door is open, the interlock prevents the grounding switch operating hole from being blocked, preventing the operating handle from being inserted. The upper rear door 31 is also equipped with an electromagnetic lock, powered by the control room of this circuit. Under normal operating conditions, the electromagnetic lock is energized and locked, with its locking lever inserted into the mechanical stop, preventing the upper rear door 31 from being opened. Only during emergency maintenance or emergency power supply, when the power to the electromagnetic lock is turned off, the lock can be switched to the open position, its locking lever retracting into its body, allowing the upper rear door 31 to be opened. A guide groove 30 is installed on the side of the upper rear door 31.

[0053] The cabinet has a double-door design at the back. The lower rear door 610 is a hinged structure. The lower part of the lower rear door 610 is connected to the lower rear crossbeam of the cable compartment via a hinge. The upper left and right sides of the lower rear door 610 are equipped with latches 630. The latches can block the left and right vertical beams of the cable compartment working chamber, so that the lower rear door 610 cannot be opened. In case of emergency maintenance or emergency power supply, the electromagnetic lock power supply is cut off, the electromagnetic lock 110 unlocks, and the upper rear door is opened; the latch 630 on the upper part of the lower rear door 610 is closed, the lower rear door 610 is opened, and the emergency power cable of the emergency power supply vehicle is installed so that the cable extends from the position of the lower rear door 610. At this time, the upper rear door is closed, the lever-type mechanical interlock assembly 19 will move downward, and the grounding switch operating shaft 17 will no longer be blocked. At this time, the grounding switch can be operated (grounding trip, isolating switch closes), and this circuit is energized, the emergency cable is energized, and the purpose of emergency power supply is achieved. Since the height of the lower rear door 610 is only 115mm, only the three-phase emergency cable can extend, and maintenance personnel will not accidentally enter the energized area. At the same time, the personal padlock is locked to prevent other personnel from opening the upper rear door assembly 5 and disconnecting the emergency power supply.

[0054] After maintenance is completed, the isolating switch is opened, the grounding switch is closed, the personal padlock is unlocked, the upper door is opened, the emergency cable is disconnected, the lower door 610 is closed, the upper door 31 is closed, the electromagnetic lock power is reset, the electromagnetic lock 110 is energized, the locking rod of the front electromagnetic lock blocks the grounding switch operating hole, the grounding switch cannot be operated; the electromagnetic lock is energized, the electromagnetic lock of the rear door is inserted into the mechanical stop plate, the lower door 610 cannot be opened, and the padlock is locked at the same time.

[0055] As can be seen from the above embodiments, the technical solution of this utility model is novel, the structure is simple, and the solution takes into account both low cost and high reliability, and is flexible and convenient to install.

[0056] High safety and reliability: The core interlocking function is guaranteed by a purely mechanical means, and is not affected by electrical problems such as power grid fluctuations and component failures, which meets the requirements of "inherent safety" in power safety.

[0057] Precise and stable transmission: The lever linkage mechanism is a rigid transmission with no delay or deformation, ensuring accurate and reliable operation and a lifespan far exceeding that of soft interlocks.

[0058] High degree of functional integration: It achieves a perfect combination of mechanical anti-misoperation and electrical monitoring, which not only meets the highest safety standards, but also has intelligent interfaces, making it easy to integrate into the power distribution automation system.

[0059] Easy to maintain: The mechanical structure is intuitive and simple, with fewer points of failure, and daily maintenance and debugging are simpler than complex rope mechanisms.

[0060] Compliant with regulations and standards: This design fully meets the mandatory requirements of the power grid and related industries for the "five-proof" interlocking of high-voltage switchgear, and has broad market application prospects.

[0061] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any modifications, equivalent substitutions and improvements made by those skilled in the art within the scope of the technology disclosed in the present utility model, within the spirit and principles of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A 10kV integrated node ring main unit with a lever-type mechanical interlocking mechanism, comprising a cable compartment (1), a switch compartment (2), a mechanism compartment (3), a control box compartment (4), a rear upper door assembly (5), a rear lower door assembly (6), a control box panel (7), a mechanism compartment panel (8), and a cable compartment door (9); characterized in that, The switch chamber (2) is equipped with a node unit mechanism (10), a first electromagnetic lock assembly (11), a PT unit mechanism (12), and a second electromagnetic lock assembly (13) directly in front of it. Inside the switch compartment (2) are installed node switches and disconnect switches. Outside the switch compartment (2) are installed node unit mechanisms (10) and PT unit mechanisms (12). The switch compartment (2) is welded with a sheet metal front plate, a sheet metal left side plate, a sheet metal right side plate and a sheet metal rear wall plate, which are filled with insulating gas for insulation and arc extinguishing. There are nails inside the sheet metal front plate for installing node switches and disconnect switches. There are nails outside the sheet metal front plate for installing node unit mechanisms (10) and PT unit mechanisms (12). The external mechanisms are connected to the internal switches through dynamic engagement. The first electromagnetic lock assembly (11) is installed at the front of the node unit mechanism (10) and locks the grounding operation hole of the node unit mechanism (10) when energized. This enables the electromagnetic lock to be locked when the circuit is energized, preventing the operation of the grounding operation shaft of the node unit mechanism (10). The first electromagnetic lock assembly (11) is an electrical interlock, and the lever mechanical interlock assembly (19) is a mechanical interlock. The second electromagnetic lock assembly (13) is installed at the front of the PT unit mechanism (12) and locks the grounding operation hole of the PT unit mechanism (12) when energized. The first electromagnetic lock assembly (11) is installed on the node unit mechanism (10). A lever mechanical interlock assembly (19) is provided between the rear upper door assembly (5) and the node unit mechanism (10) at the front of the cabinet for accurately transmitting the movement from the front operating mechanism across the entire cabinet space to the rear cabinet door lock.

2. The 10kV integrated node ring main unit with lever-type mechanical interlocking mechanism according to claim 1, characterized in that, The cable compartment door (9) is installed in front of the cable compartment (1). An interlocking device (18) is designed between the cable compartment door (9) and the PT unit mechanism (12). When the grounding switch of the PT unit mechanism (12) is open and the load switch of the PT unit mechanism (12) is closed, the cable compartment door (9) cannot be opened.

3. The 10kV integrated node ring main unit with lever-type mechanical interlocking mechanism according to claim 1, characterized in that, An integrated node bushing (29) is installed at the rear lower part of the switch chamber (2).

4. The 10kV integrated node ring main unit with lever-type mechanical interlocking mechanism according to claim 1, characterized in that, The first electromagnetic lock assembly (11) is assembled together by means of an electromagnetic lock (110), an electromagnetic lock bracket (120), a first electromagnetic lock rod (130), and an electromagnetic lock baffle (140) through a fixed connection; The first electromagnetic lock assembly (11) is designed at the front of the cabinet and is used for the grounding operation hole of the live locking node unit mechanism (10). During normal operation, the power switch of the electromagnetic lock (110) is in the closed state, the electromagnetic lock (110) is live locked, and the grounding switch operation hole of the node unit mechanism (10) is blocked. During emergency maintenance or emergency power supply, the power switch of the electromagnetic lock (110) is opened, the electromagnetic lock is de-energized, the electromagnetic lock (110) is unlocked, and the lever on the electromagnetic lock (110) is moved to the unlock position. The first electromagnetic lock rod (130) and the electromagnetic lock baffle (140) are displaced to the left. At this time, the electromagnetic lock baffle (140) no longer blocks the grounding switch operation hole.

5. The 10kV integrated node ring main unit with lever-type mechanical interlocking mechanism according to claim 1, characterized in that, The rear upper door assembly (5) consists of a rear upper door (31), a rear upper door handle (32), a rear door electromagnetic lock (25), a second electromagnetic lock rod (26), and a rear upper door interlocking bend plate (27); the rear upper door interlocking bend plate (27) is designed with an interlocking bend plate slot (28).

6. The 10kV integrated node ring main unit with lever-type mechanical interlocking mechanism according to claim 1, characterized in that, The lever mechanical interlock assembly (19) consists of a first vertical connecting rod (1901), a first connecting plate (1902), a first horizontal connecting rod (1903), a vertical support plate (1904), a second connecting plate (1905), a second vertical connecting rod (1906), a first vertical guide plate (1907), a second horizontal connecting rod (1908), a rotating shaft (1909), a third connecting plate (1920), a third horizontal connecting rod (1921), a first horizontal guide plate (1922), a fourth connecting plate (1923), a lever bend plate (1924), a vertical guide shaft (1925), and a lever interlock head (1926). The lever interlock head (1926) has a round hole at its end. After the rear door assembly (5) is closed, the interlocking bend plate slot (28) will press down on the upper edge of the lever interlock head (1926). Under the interaction of the lever mechanical interlock assembly (19), the baffle on the interlocking device (18) will move downward. At this time, the grounding switch operation hole of the node unit mechanism (10) will not be blocked.

7. The 10kV integrated node ring main unit with lever-type mechanical interlocking mechanism according to claim 6, characterized in that, In normal operation, the rear upper door assembly (5) is closed, the rear door electromagnetic lock (25) is energized and locked, the second electromagnetic lock rod (26) will extend out of the rear door electromagnetic lock (25) and into the round hole at the end of the lever interlock head (1926); the electromagnetic lock is energized, the second electromagnetic lock rod (26) locks the lever mechanical interlock assembly (19), when the power switch of the electromagnetic lock is in the open state, the electromagnetic lock is de-energized and unlocked, the lever on the electromagnetic lock is moved to the unlock position, the second electromagnetic lock rod (26) retracts into the rear door electromagnetic lock (25), and the rear upper door assembly (5) is opened.

8. The 10kV integrated node ring main unit with lever-type mechanical interlocking mechanism according to claim 6, characterized in that, The first vertical link (1901) is fixedly connected to the interlocking device (18), which moves downward / upward when the upper rear door assembly (5) is closed / open; the first vertical link (1901) is fixedly connected to the first horizontal link (1903) through the first connecting plate (1902), and the vertical support plate (1904) provides fixed support and guidance for the first horizontal link (1903), which is fixedly installed on the bottom plate (20) of the mechanism chamber; the second vertical link (1906) is fixedly connected to the first horizontal link (1903) through the second connecting plate (1905), and the first vertical guide plate (1907) provides vertical guidance for the second vertical link (1906); A rotating shaft (1909) is provided on the left side plate (21) of the cable compartment. Under the action of the rotating shaft (1909), the second horizontal connecting rod (1908) rotates around the rotating shaft (1909). The third horizontal connecting rod (1921) is fixedly connected to the second horizontal connecting rod (1908) through the third connecting plate (1920). A square hole is designed on the middle partition plate (22) of the cable compartment corresponding to the position of the third horizontal connecting rod (1921). At the same time, a positioning shaft is designed on the first horizontal guide plate (1922). The lever bending plate (1924) is fixedly connected to the third horizontal connecting rod (1921) through the fourth connecting plate (1923). The vertical guide shaft (1925) fixes and guides the movement of the lever bending plate (1924). Under the action of the vertical guide shaft (1925), the lever bending plate (1924) moves vertically up and down.

9. The 10kV integrated node ring main unit with lever-type mechanical interlocking mechanism according to claim 6, characterized in that, The upper curved edge of the upper rear door (31) is designed with a strip hole (33) for the upper rear door. The upper rear door moves upward and downward under the action of the upper rear door guide plate (37). The upper rear beam (35) of the cable compartment is installed on the upper rear of the cable compartment (1). The upper rear beam interlocking plate (36) is designed at the bend on one side of the upper rear beam (35). A round hole, i.e. a padlock hole, is designed at the end of the upper rear door assembly (5). When the upper rear door assembly (5) is closed, the round hole at the end of the upper rear beam interlocking plate (36) is exposed and locked with a padlock (34). The upper rear door assembly (5) cannot be opened.

10. The 10kV integrated node ring main unit with lever-type mechanical interlocking mechanism according to claim 6, characterized in that, The rear lower door assembly (6) is fixedly connected by welding or assembly of the rear lower door (610), the latch bracket (620), the latch (630), and the rotating device (640).

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