Ring main unit and interlocking device thereof

Abstract

The invention relates to a ring main unit and an interlocking device thereof. The ring main unit comprises a three-position mechanism, a three-position switch and a circuit breaker mechanism which are arranged in a cabinet body. The interlocking device comprises a first interlocking module on the three-station mechanism side, a second interlocking module on the cable chamber door side and a third interlocking module on the circuit breaker mechanism side. The first interlocking module is connected with the second interlocking module through the first transmission member, connected with the third interlocking module through the second transmission member and the third transmission member, and connected with the output shaft of the circuit breaker through the fourth transmission member so as to realize a five-prevention interlocking mechanism.

Description

TECHNICAL FIELD

[0001] The present application relates to medium voltage switchgear, in particular to ring main unit and its interlocking device. BACKGROUND

[0002] Ring main unit is a switchgear used in ring network power supply system. In recent years, with the continuous improvement of environmental protection requirements, ring main unit continues to evolve in technology and product form, and gradually develops into medium voltage switchgear using environmentally friendly gas (mainly dry air or nitrogen) as insulation medium, i.e. environmentally friendly cabinet. However, in the prior art, the isolation interlocking device used in the environmentally friendly cabinet still has some defects, for example, due to the need to cover three-position mechanism and circuit breaker mechanism in interlocking design, the structure size of the involved sheet metal parts is large, the flatness and strength are relatively low, and the assembly reference is not uniform. In addition, in the process of assembly and transportation, the parts are easy to be deformed by impact or vibration, which further causes the interlocking mechanism to be stuck in motion, the flexibility to be reduced, and the electrical switching to be unreliable.

[0003] Therefore, the industry urgently needs to optimize and improve the existing interlocking device to improve the assembly convenience, interlocking reliability and electrical switching stability. SUMMARY

[0004] The present application aims to provide an interlocking device of ring main unit, which at least solves some of the above technical problems.

[0005] The present application also aims to provide a ring main unit applying the improved interlocking device.

[0006] According to one aspect of the present application, there is provided an interlocking device for a ring main unit, the ring main unit comprising: a cabinet defining a cable chamber, the cable chamber being provided with a cable chamber door openable and closable; a three-position mechanism and a three-position switch installed in the cabinet, the three-position switch having a main contact movable between a closed position, an isolated position and a grounded position, the three-position mechanism comprising a first output shaft connected to the main contact, and a closed operation shaft and a grounded operation shaft drivingly connected to the first output shaft; a circuit breaker mechanism installed in the cabinet, comprising a second output shaft, and a closed mechanism and an open mechanism drivingly connected to the second output shaft. The interlocking device comprises: a first interlocking module installed in the cabinet close to the three-position mechanism; a second interlocking module connected to the cable chamber door and connected to the first interlocking module through a first transmission member; a third interlocking module installed in the cabinet close to the circuit breaker mechanism and connected to the first interlocking module through a second transmission member and a third transmission member respectively; wherein when the cable chamber door is closed, the second interlocking module drives the first interlocking module to move linearly away from the first output shaft through the first transmission member, to allow the first output shaft to rotate and drive the main contact to move to the closed position or the isolated position; when the main contact moves to the closed position or the isolated position, the first interlocking module is restricted to move linearly close to the first output shaft, to keep the cable chamber door in the closed state; when the circuit breaker mechanism is open, the second interlocking module is locked by the second output shaft, to keep the cable chamber door in the closed state; when the main contact moves to the grounded position and the circuit breaker mechanism is closed, the first interlocking module is released to allow the cable chamber door to be opened, while the second interlocking module locks the open mechanism; when the main contact is in the isolated position, the first interlocking module drives the third interlocking module to move to lock the closed mechanism through the second transmission member; the first interlocking module is further connected to the second output shaft through a fourth transmission member, the second output shaft drives the first interlocking module to move away from the closed operation shaft and the grounded operation shaft through the fourth transmission member when the circuit breaker mechanism is open, and the first interlocking module is automatically reset and locks the closed operation shaft and the grounded operation shaft when the circuit breaker mechanism is closed; when the closed operation shaft and the grounded operation shaft are allowed to be operated, the first interlocking module drives the third interlocking module to move to lock the closed mechanism through the third transmission member.

[0007] The interlocking device provided by the scheme decomposes complex interlocking logic into clear modular structure by setting three functionally clear and interrelated interlocking modules. The design simplifies the structure and overall assembly relationship. The interlocking pieces can adopt smaller mold pieces, have higher integration, and help unify the part size, thereby reducing assembly difficulty and cost. Single transmission piece (such as a pull rod or a pull plate) is used for power transmission and coupling between the modules. This mechanical transmission mode is direct and reliable, optimizes the force flow transmission path, has a large tolerance, is convenient for adjusting the assembly error between the modules, and ensures smooth and high reliability of the interlocking action. The interlocking device of the scheme is fully functional, realizes strict mechanical interlocking between the three-position mechanism, the circuit breaker mechanism and the cable chamber door, and prevents the operator from mistakenly entering the live compartment. This comprehensive and logically rigorous interlocking mechanism greatly improves the safety of device operation and eliminates the possibility of misoperation. The modular design makes the structure of each functional unit more compact and more targeted, helps to design better structure strength and action stability for key components, and improves the reliability of long-term running equipment.

[0008] In some embodiments, the first interlocking module comprises: a cam engaged with the first output shaft; a movable rod capable of linear motion to approach or move away from the first output shaft, the movable rod being rigidly connected to one end of the first transmission piece; and a reset spring connected to the movable rod and applying a force to the movable rod to linearly move the movable rod in the direction of approaching the first output shaft.

[0009] In some embodiments, the second interlocking module comprises: a sliding frame rigidly connected to the other end of the first transmission piece, the sliding frame having a limiting slot and a long slot extending at an angle with respect to the sliding direction of the sliding frame; a stop cam pivotally arranged in the cabinet body and provided with a rod, the rod being inserted into the long slot of the sliding frame and capable of moving along the long slot; and a hanging rod detachably connected to the cable chamber door and provided with a limiting rod inserted into the limiting slot of the sliding frame; wherein the cable chamber door moving in the closing direction drives the sliding frame through the hanging rod, the sliding frame drives the movable rod to linearly move away from the first output shaft through the first transmission piece, to allow the first output shaft to drive the main contact to move to the closed position or the isolated position; when the main contact moves to the closed position or the isolated position, the cam abuts against the movable rod and limits the linear movement of the movable rod in the direction of approaching the first output shaft, to keep the cable chamber door in the closed state; when the first output shaft drives the main contact to move to the grounding position, the cam moves away from the movable rod.

[0010] In some embodiments, the second output shaft of the circuit breaker mechanism is connected with a radially extending top plate, when the circuit breaker mechanism is opened, the second output shaft is rotated to make the top plate press against the slide frame to keep the cable chamber door in closed state.

[0011] In some embodiments, the opening mechanism of the circuit breaker mechanism comprises a pivotable opening drive shaft and an opening plate engaged with the opening drive shaft, when the cable chamber door is closed in place, the slide frame clears the opening plate to allow the circuit breaker mechanism to open, while when the cable chamber door is moved in opening direction, the slide frame locks the opening plate to restrict the circuit breaker mechanism from opening.

[0012] In some embodiments, a door proximity switch is installed adjacent to the movable rod, the door proximity switch is triggered by the movable rod moving away from the first output shaft to provide a signal.

[0013] In some embodiments, the first interlock module comprises a toggle arm engaged with the first output shaft, the third interlock module comprises a pivotable first interlock baffle having a first arc-shaped slot, one end of the second transmission member is connected to the toggle arm, and the other end is inserted into and movable along the first arc-shaped slot, when the main contact is in the isolation position, the toggle arm drives the first interlock baffle to pivot through the second transmission member to lock the closing mechanism to restrict the circuit breaker mechanism from closing.

[0014] In some embodiments, the first interlock module comprises: a first interlock assembly disposed adjacent to the grounding operation shaft and comprising a first toggle and a first rotating member, during operation of the grounding handle on the grounding operation shaft, the first toggle is driven to push the first rotating member to pivot; a second interlock assembly disposed adjacent to the closing operation shaft and comprising a second toggle and a second rotating member, during operation of the closing handle on the closing operation shaft, the second toggle is driven to push the second rotating member to pivot, wherein one of the first rotating member and the second rotating member is connected to one end of the third transmission member; a connecting rod connected between the first rotating member and the second rotating member.

[0015] In some embodiments, the first rotating member and the second rotating member each comprise: a shaft rod pivotably disposed within the cabinet; an arm radially extending from the shaft rod and having spaced apart first and second apertures, one of the first and second apertures is for mounting the connecting rod, and the other is for mounting the third transmission member; a ramp extending from the shaft rod and gradually approaching the corresponding toggle in the operation direction of the closing handle or the grounding handle.

[0016] In some embodiments, a ground micro switch is mounted adjacent to the first lever, the first lever is driven during the operation of the ground handle on the ground operating shaft, and the ground micro switch is triggered by the first lever to provide a signal; a close micro switch is mounted adjacent to the second lever, the second lever is driven during the operation of the close handle on the close operating shaft, and the close micro switch is triggered by the second lever to provide a signal.

[0017] In some embodiments, the third interlocking module comprises a second pivotable interlocking baffle, the second interlocking baffle has a second arc-shaped slot, a pin fixed in the cabinet is arranged in the second arc-shaped slot, the pin can move along the second arc-shaped slot, the second interlocking baffle is connected to the other end of the third transmission member, the first interlocking module drives the second interlocking baffle to pivot to lock the closing mechanism to limit the closing of the circuit breaker mechanism during the operation of the close handle on the close operating shaft or during the operation of the ground handle on the ground operating shaft.

[0018] In some embodiments, the first interlocking module comprises a movable interlocking cover plate, the second output shaft of the circuit breaker mechanism is connected with a radially extending top plate, one end of the fourth transmission member is connected to the top plate, and the other end is connected to the interlocking cover plate, the top plate drives the interlocking cover plate to move away from the close operating shaft and the ground operating shaft through the fourth transmission member during the opening of the circuit breaker mechanism.

[0019] According to another aspect of the present application, there is provided a ring main unit, comprising: a cabinet defining a cable chamber, the cable chamber is provided with an openable and closable cable chamber door; a three-position mechanism and a three-position switch installed in the cabinet, the three-position switch has a main contact capable of moving between a closed position, an isolated position and a grounded position, the three-position mechanism comprises a first output shaft connected to the main contact, and a close operating shaft and a ground operating shaft driven connected to the first output shaft; a circuit breaker mechanism installed in the cabinet, comprising a second output shaft, and a closing mechanism and an opening mechanism driven connected to the second output shaft; the ring main unit further comprises the aforementioned interlocking device.

[0020] Some of the other features and advantages of the present application will become apparent from the specification, and from the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] Embodiments of the present application will now be described, by way of example, with reference to the accompanying drawings, in which:

[0022] Figure 1 is a schematic view of an interlocking device of a ring main unit according to an embodiment of the present application;

[0023] Figure 2 is a schematic diagram of the interlock of the three-position switch and the cable chamber door in the interlock device according to an embodiment of the present application;

[0024] Figure 3 and Figure 4 is a schematic diagram of different angles of the second interlock module in the interlock device according to an embodiment of the present application;

[0025] Figure 5 is a schematic diagram of the interlock of the three-position switch and the circuit breaker in the interlock device according to an embodiment of the present application;

[0026] Figure 6 is a schematic diagram of the operation of the three-position switch and the circuit breaker interlock in the interlock device according to an embodiment of the present application;

[0027] Figure 7 is a schematic diagram of the assembly of the interlock, the sliding shaft and the electrical switch in the interlock device according to an embodiment of the present application;

[0028] Figure 8 is a schematic diagram of the assembly of the second interlock module and the interlock cover plate in the interlock device according to an embodiment of the present application;

[0029] Figure 9 is a schematic diagram of the status indicator of the three-position mechanism in the interlock device according to an embodiment of the present application.

[0030] BRIEF DESCRIPTION OF DRAWINGS

[0031] 1 - three-position mechanism; 11 - first support; 121 - fixed plate; 12 - closing operation shaft; 13 - grounding operation shaft; 14 - first output shaft; 15 - closing handle; 16 - grounding handle; 17 - indicator; 171 - through hole; 172 - handle; 2 - circuit breaker mechanism; 21 - second support; 22 - closing lever; 23 - closing drive shaft; 24 - spring; 25 - top plate; 26 - second output shaft; 3 - cable chamber door; 4 - first interlocking module; 40 - cam; 41 - crank arm; 42 - movable lever; 421 - return spring; 43 - door closing micro switch; 44 - interlocking cover plate; 41 - through hole; 442 - long slot; 45 - first interlocking assembly; 451 - first hook; 452 - first rotating piece; 46 - second interlocking assembly; 461 - second hook; 462 - second rotating piece; 463 - shaft; 464 - arm; 465 - first orifice; 466 - second orifice; 467 - inclined ridge; 47 - closing micro switch; 48 - grounding micro switch; 49 - connecting rod; 5 - second interlocking module; 51 - hanging lever; 511 - limiting rod; 52 - fixed frame; 521 - first sliding groove; 522 - second sliding groove; 53 - sliding frame; 531 - long slot; 532 - rod; 533 - limiting slot; 54 - stop cam; 541 - pivot; 542 - rod; 6 - third interlocking module; 61 - first interlocking baffle; 611 - first hole; 612 - first arc-shaped slot; 62 - second interlocking baffle; 621 - second hole; 622 - second arc-shaped slot; 63 - pin; 100 - first transmission piece; 200 - second transmission piece; 300 - third transmission piece; 400 - fourth transmission piece DETAILED DESCRIPTION

[0032] With reference to the drawings, the illustrative aspects of the disclosed technology will be described in detail. Although the drawings are provided to illustrate some embodiments of the disclosed technology, the drawings are not necessarily drawn to scale and certain features can be exaggerated, removed, or partially sectioned to better illustrate and explain the disclosed technology. Some components in the drawings can be adjusted in position according to actual needs without affecting the technical effects. The phrase "in the drawings" or similar language appearing in the specification is not necessarily referring to all of the drawings or examples.

[0033] Some directional terms used to describe the drawings in the following, such as "inner", "outer", "upper", "lower", and other directional terms, will be understood to have their normal meanings and refer to those directions involved when normally viewing the drawings. Unless otherwise indicated, the directional terms described in the specification are basically according to the conventional directions as understood by those skilled in the art.

[0034] The terms "first", "the first", "second", "the second", and the like, used in the present invention, do not indicate any order, number or importance in the present invention, but are used to distinguish one component from another.

[0035] The modular design interlocking device provided by the present invention is applied to a ring main unit, especially an environmentally friendly cabinet. The ring main unit has a metal cabinet body, and a plurality of compartments are separated by partitions in the cabinet body for arranging electrical devices, such as a three-position mechanism, a three-position switch, a circuit breaker mechanism, and a busbar. The three-position mechanism is an operating mechanism of the three-position switch. The main contact of the three-position switch can move between a closed position, an isolated position, and a grounding position under the drive of the three-position mechanism. One compartment in the cabinet body is a cable chamber, and a door that can be opened and closed is provided for the cable chamber.

[0036] Figures 1 to 8 A part of the cabinet body of the ring main unit is exemplarily shown. As shown in the figure, the three-position mechanism 1 is installed to a first support 11, which can be a metal partition in the cabinet body or a part of the wall of the cabinet body. The first output shaft 14, the closing operation shaft 12, and the grounding operation shaft 13 of the three-position mechanism 1 are installed on the first support 11 in parallel and spaced apart from each other, and can each pivot around its own central axis. The first output shaft 14 is connected to the main contact of the three-position switch. In the embodiment shown, the closing operation shaft 12 and the grounding operation shaft 13 are arranged vertically, and the first output shaft 14 is located on one side of them and between them in height. The closing operation shaft 12 and the grounding operation shaft 13 can drive the first output shaft 14 to pivot, respectively, to drive the main contact of the three-position switch to switch between the closed position, the isolated position, and the grounding position. Figure 9 The three-position state indicator 17 shown is installed on the first output shaft 14, such as passing the first output shaft 14 through the through hole 171 of the indicator 17. The indicator 17 can move synchronously with the rotation of the first output shaft 14.

[0037] The circuit breaker mechanism 2 is installed to a second support 21 on one side of the three-position mechanism 1, in the illustrated embodiment, below the three-position mechanism 1. The second support 21 can be a metal partition in the cabinet or a part of the wall of the cabinet. The second output shaft 26, the closing drive shaft 23 and the opening drive shaft (not shown in the figure) of the circuit breaker mechanism 2 are installed parallel to and spaced from each other on the second support 21 and can each pivot about its own central axis. In the illustrated embodiment, the second output shaft 26 is located between the closing drive shaft 23 and the opening drive shaft. The second output shaft 26 is connected to the movable contact of the circuit breaker mechanism 2. A radially extending closing lever 22 is fixedly installed on the closing drive shaft 23. A spring 24 is sleeved on the closing drive shaft 23 and provides a restoring force. Turning the closing lever 22 drives the closing drive shaft 23 to pivot, which can further drive the second output shaft 26 to rotate in the closing direction, thereby driving the movable contact to approach the stationary contact and achieving closing of the circuit breaker mechanism 2. When the circuit breaker mechanism 2 is opened, the closing drive shaft 23 can be automatically reset under the action of the spring 24. A radially extending opening plate is installed on the opening drive shaft of the circuit breaker mechanism 2. Turning the opening plate drives the opening drive shaft to pivot, which can further drive the second output shaft 26 to rotate in the opening direction, thereby driving the movable contact to move away from the stationary contact and achieving opening of the circuit breaker mechanism 2. When the circuit breaker mechanism 2 is closed, the opening drive shaft can be automatically reset under the action of its own reset spring.

[0038] The cable compartment door 3 and the three-position mechanism 1 are located on opposite sides of the circuit breaker mechanism 2. Driving the cable compartment door 3 away from the three-position mechanism 1 and the circuit breaker mechanism 2 can close the cable compartment compartment. Driving the cable compartment door 3 towards the three-position mechanism 1 and the circuit breaker mechanism 2 can open the cable compartment compartment. In the illustrated embodiment, the cable compartment door 3 is located below the circuit breaker mechanism 2, and moving the cable compartment door 3 vertically downward will close the cable compartment compartment, and moving the cable compartment door 3 vertically upward will open the cable compartment compartment.

[0039] The interlocking device is divided into three modules according to function and area, namely a first interlocking module 4 on the side of the three-position mechanism, a second interlocking module 5 on the side of the cable compartment door, and a third interlocking module 6 on the side of the circuit breaker mechanism. The three modules are connected by a single longitudinal transmission member, such as a connecting plate or a pull rod, to achieve force transmission and establish an interlocking mechanism. The three interlocking modules are described below in conjunction with the drawings.

[0040] First interlocking module

[0041] The first interlocking module 4 is installed close to the three-position mechanism 1. In the first interlocking module 4, the cam 40 and the toggle arm 41 are sleeved on the first output shaft 14 of the three-position mechanism 1 and are arranged spaced apart in the radial direction of the first output shaft 14. As shown in Figure 2As shown, the movable rod 42 associated with the cam 40 in positional and movement relationship can move linearly to approach or move away from the first output shaft 14. In order to mount the movable rod 42, a fixed frame 121 can be mounted on the first bracket 11, which is formed with an opening for the movable rod 42 to pass through, thereby defining the movement track of the movable rod 42. The end of the movable rod 42 approaching the first output shaft 14 can be formed with a lateral cantilever, which can form a stop around the opening of the fixed frame 121 to limit the stroke of the movable rod 42, or can serve as a limiting member cooperating with the cam 40.

[0042] When the cable chamber door 3 is closed, the movable member 42 can be driven by the second interlocking module 5 to be described later to move linearly away from the first output shaft 14, thereby leaving the rotating path of the cam 40 to allow the first output shaft 14 to drive the main contact of the three-position switch to move to the closed position or the isolated position. When the main contact moves to the closed position or the isolated position, the cam 40 rotates to a position where it can abut against the movable rod 42 from the side of the movable rod 42 away from the cable chamber door 3 to prevent the movable rod 42 from being reset. In the embodiment shown, when the main contact moves to the closed position or the isolated position, the cam 40 rotates to a position where it can press the top surface of the lateral cantilever of the movable rod 42 with the outer convex arc edge thereof, so that the movable rod 42 cannot move linearly to the first output shaft 14 and reset under the action of the reset spring 421, keeping the cable chamber door 3 in the closed state. When the first output shaft 14 drives the main contact of the three-position switch to move to the grounding position, the cam 40 moves synchronously and away from the movable rod 42, at which time the movable rod 42 has a tendency to move to the first output shaft 14 to reset under the drive of the reset spring 421.

[0043] The closed operation shaft 12 and the grounding operation shaft 13 of the three-position mechanism 1 can pass through the fixed frame 121, and the front ends of each of them extending out of the fixed frame 121 can serve as operation ends to engage the closed handle 15 and the grounding handle 16, respectively. The closed operation shaft 12 and the grounding operation shaft 13 are respectively provided with interlocking assemblies. For the sake of clarity, the interlocking assembly corresponding to the upper grounding operation shaft 13 is defined as the first interlocking assembly 45, and the interlocking assembly corresponding to the lower closed operation shaft 12 is defined as the second interlocking assembly 46. The first interlocking assembly 45 and the second interlocking assembly 46 can have the same or similar structure. As shown, the first interlocking assembly 45 includes a first slider 451 mounted on the fixed frame 121 and a first rotating member 452. The first slider 451 can move in the axial direction of the grounding operation shaft 13. The first rotating member 452 can rotate under the drive of the first slider 451. The second interlocking assembly 46 includes a second slider 461 mounted on the fixed frame 121 and a second rotating member 462. The second slider 461 can move in the axial direction of the closed operation shaft 12. The second rotating member 462 can rotate under the drive of the second slider 461.

[0044] Since the first interlocking component 45 and the second interlocking component 46 in this embodiment adopt basically the same structure, therefore Figure 7 The second interlocking assembly 46 is shown only as an example for reference. As shown, the front end of the second latch 461 can extend from the mounting bracket 121. The closing handle 15 can be fitted onto the operating end of the closing operating shaft 12 and moved axially along the closing operating shaft 12 a certain unlocking distance. Afterward, rotating the closing handle 15 can drive the closing operating shaft 12 to rotate synchronously. When the closing handle 15 moves axially along the closing operating shaft 12, the second latch 461 can be synchronously pushed to move axially along the closing operating shaft 12. The second rotating member 462 is a one-piece molded part, and the two ends of its shaft 463 can be used to fit a mounting bracket and connect the mounting bracket to the mounting bracket 121. An arm 464 can be integrally extended from approximately the middle position of the shaft 463. The arm 464 has openings formed at two spaced-apart positions, including a first opening 465 near the shaft 463 and a second opening 466 away from the shaft 463. Adjacent to arm 464, a ridge 467 extends integrally from shaft 463. This ridge 467 gradually approaches the second latch 461 from front to back, such that the distance between the ridge 467 and the second latch 461 gradually decreases towards the rear end of the second latch 461. Therefore, when the closing handle 15 pushes the second latch 461, the second latch 461 simultaneously pushes the second rotating member 462 to rotate around the central axis of shaft 463.

[0045] A grounding microswitch 48 can be installed near the first latch 451. When the first latch 451 is pushed by the grounding handle 16, the grounding microswitch 48 can be triggered to send a signal, which is then fed into the closing circuit of the circuit breaker mechanism. Similarly, a closing microswitch 47 can be installed near the second latch 461. When the second latch 461 is pushed by the closing handle 15, the closing microswitch 47 can be triggered to send a signal, which is then fed into the closing circuit of the circuit breaker mechanism.

[0046] The first interlocking assembly 45 and the second interlocking assembly 46 can be linked together by a connecting rod 49 connecting the first rotating member 452 and the second rotating member 462. In the illustrated embodiment, one end of the connecting rod 49 is inserted into the first hole of the upper first rotating member 452, and the lower end of the connecting rod 49 is inserted into the first hole 465 of the lower second rotating member 462, so as to realize the force transmission between the two rotating members.

[0047] The fixed frame 121 is further provided with an interlocking cover plate 44, which can be moved to lock the closing operation shaft 12 and the grounding operation shaft 13, for example, to block in front of the closing operation shaft 12 and the grounding operation shaft 13 to prevent the operator from operating the corresponding operation shaft by the handle. The interlocking cover plate 44 can also be moved away from the closing operation shaft 12 and the grounding operation shaft 13 to allow the operator to operate the corresponding operation shaft by the handle. A sliding groove extending along the movement direction of the interlocking cover plate 44 can be formed on the fixed frame 121, and a pin is installed on the interlocking cover plate 44. By inserting the pin into the sliding groove, the interlocking cover plate 44 can be moved along the path defined by the sliding groove. Alternatively, the sliding groove can be formed on the interlocking cover plate, and the pin can be installed on the fixed frame 121. Figure 8 An exemplary through hole 441 for installing the pin is formed on the interlocking cover plate 44.

[0048] The interlocking cover plate 44 is further provided with a long slot 442 extending along its movement direction, and one end of a fourth transmission member 400 configured as a pull rod is inserted into the long slot 442 of the interlocking cover plate 44 and can move along the long slot 442, and the other end of the fourth transmission member 400 is inserted into a through hole of a top plate 25 on the second output shaft 26 of the circuit breaker mechanism 2, so that the interlocking between the opening and closing states of the circuit breaker mechanism 2 and the operation shafts of the three-position mechanism 1 is established by the fourth transmission member 400.

[0049] Specifically, when the circuit breaker mechanism 2 is opened, the second output shaft 26 rotates in the counterclockwise opening direction shown in the figure, driving the top plate 25 to press down. The top plate 25 pulls the interlocking cover plate 44 to move downward in the vertical direction through the fourth transmission member 400, thereby exposing the closing operation shaft 12 and the grounding operation shaft 13, and at this time the operator can operate the closing operation shaft 12 or the grounding operation shaft 13 by means of the closing handle 15 or the grounding handle 16. When the circuit breaker mechanism 2 is closed, the interlocking cover plate 44 can be automatically moved upward by means of the reset spring connected between it and the fixed frame 121, and is blocked in front of the closing operation shaft 12 and the grounding operation shaft 13 again, preventing the operator from operating any operation shaft of the three-position mechanism 1 during the closing of the circuit breaker mechanism 2.

[0050] As previously described, a three-position state indicator 17 can also be provided on the first output shaft 14 of the three-position mechanism 1. When the first output shaft 14 drives the main contact of the three-position switch to move to the isolating position, the indicator 17 moves with the first output shaft 14, so that the radially extending handle 172 of the indicator 17 moves between the closing operation shaft 12 and the grounding operation shaft 13, so that the closing operation shaft 12 and the grounding operation shaft 13 are exposed at the same time. When the first output shaft 14 drives the main contact of the three-position switch to move to the closing position, the indicator 17 moves with the first output shaft 14 to block the grounding operation shaft 13 with the handle 172, so as to limit the operation of the grounding operation shaft 13 during the closing of the three-position switch. When the first output shaft 14 drives the main contact of the three-position switch to move to the grounding position, the indicator 17 moves with the first output shaft 14 to block the closing operation shaft 12 with the handle 172, so as to limit the operation of the closing operation shaft 12 during the grounding of the three-position switch.

[0051] Second interlocking module

[0052] The second interlocking module 5 is installed close to the cable chamber door 3. In the second interlocking module 5, a longitudinal hanging rod 51 is movably arranged through a fixed frame 52, and the length direction of the hanging rod 51 corresponds to the movement direction of the cable chamber door 3. One end of the hanging rod 51 is detachably connected to the cable chamber door 3, and the other end extends away from the cable chamber door 3. The fixed frame 52 can be a part of a fixed partition or frame in the cabinet. A limiting rod 511 extending at an angle (for example, perpendicular to the length direction of the hanging rod 51) from the hanging rod 51 is installed on the hanging rod 51, and the limiting rod 511 passes through a first sliding groove 521 on the fixed frame 52 extending along the length direction of the hanging rod 51 and can move along the first sliding groove 521. A sliding frame 53 is movably arranged to the fixed frame 52 along the length direction of the hanging rod 51. In one embodiment, the fixed frame 52 is formed with a second sliding groove 522 extending along the length direction of the hanging rod 51, and the sliding frame 52 is provided with a rod 532. By inserting the rod 532 into the second sliding groove 522, the sliding frame 53 can move along the path defined by the second sliding groove 522. Alternatively, the second sliding groove can be formed on the sliding frame 53, and the rod can be installed on the fixed frame 52. The limiting rod 511 on the hanging rod 51 passes through the first sliding groove 521 of the fixed frame 52 and is inserted into a limiting groove 533 of the sliding frame 53. The limiting groove 533 is open on the side away from the cable chamber door 3, so as to allow the limiting rod 511 to move out of the containing groove 533.

[0053] The second interlocking module 5 further comprises a stop cam 54 pivotable about a pivot shaft 541 mounted to the fixed frame 52, and a lever 542 is provided on the stop cam 54. The sliding frame 52 has an elongated slot 531 extending at an angle to the direction of movement of the sliding frame 52, for example, perpendicular to the direction of movement of the sliding frame 52. The lever 542 of the stop cam 54 passes through the elongated slot 531 of the sliding frame 53 and is movable along the elongated slot 531. Through the movement of the sliding frame 53, the stop cam 54 can be driven to rotate about the pivot shaft 541, so that the protruding arc edge of the stop cam 54 is suspended above the limiting rod 511 away from the cable chamber door 3, or the stop cam 54 is driven to rotate about the pivot shaft 541 to clear the limiting rod 511.

[0054] The sliding frame 53 is rigidly connected to one end of the first transmission member 100 configured as a connecting plate, and the other end of the first transmission member 100 is rigidly connected to the end of the movable rod 42 of the first interlocking module 4. In this way, the first transmission member 100 establishes the interlocking between the state of the three-position switch and the opening and closing of the cable chamber door 3.

[0055] Specifically, when the cable chamber door 3 is closed, for example, the cable chamber door 3 is pulled vertically downward in the embodiment shown, the cable chamber door 3 drives the hanging rod 51 of the second interlocking module 5 to move vertically downward, and the hanging rod 51 drives the sliding member 53 to move synchronously through the limiting rod 511. The sliding member 53 drives the first transmission member 100 to move vertically downward, and in turn drives the movable rod 42 of the first interlocking module 4 to move linearly downward away from the first output shaft 14, clearing the rotating path of the cam 40. At this time, the main contact can be driven to move to the closed position or the isolation position by the first output shaft 14. When the main contact moves to the closed position or the isolation position, the cam 40 presses the movable rod 42 with the outer protruding arc edge, preventing the movable rod 42 from moving upward to reset under the drive of the reset spring 421. The downward movement of the movable rod 42 triggers the door closing microswitch 43 mounted to the fixed frame 121, providing a signal that the cable chamber door 3 is closed. When the sliding member 53 moves downward with the closing of the cable chamber door 3, the stop cam 54 is driven to pivot by the sliding member 53 so that the outer protruding arc edge of the stop cam 54 is suspended above the limiting rod 511, thereby blocking the upward movement of the limiting rod 511. When the cable chamber door 3 is completely closed, if an upward opening external force is applied, due to the blocking of the limiting rod 511 by the stop cam 54, the external force will not cause the cable chamber door 3 to open accidentally. In addition, the external force will hardly be fed back to the sliding frame 53 or the first transmission member 100, so that the remaining interlocking members will not be impacted by the external force.

[0056] When the main contact of the three-position mechanism 1 is in the ground position, the first output shaft 14 is rotated to move the cam 40 away from the movable lever 42. At this time, as mentioned above, the movable lever 42 has a tendency to move upward linearly to reset under the action of the reset spring 421. Here, whether the movable lever 42 can move upward to reset depends on the state of the circuit breaker mechanism 2, because if the circuit breaker mechanism 2 is in the open state, the depressed top plate 25 will abut against the top surface of the sliding frame 53, forcing the sliding frame 53 to remain closed together with the cable compartment door 3. In other words, when the first output shaft 14 is rotated to move the cam 40 away from the movable lever 42, if the circuit breaker mechanism 2 is in the open state, such that the top plate 25 is still depressed and abuts against the sliding frame 53, the force of the reset spring 421 is not enough to drive the movable lever 42 to move upward, and the cable compartment door 3 remains in the fully closed state. Only when the first output shaft 14 is rotated to move the cam 40 away from the movable lever 42, and the circuit breaker mechanism 2 is also in the closed state, such that the top plate 25 is moved upward and leaves the sliding frame 53, the sliding frame 53 is allowed to move upward under the action of the reset spring 421 of the movable lever 42, and the cable compartment door 3 can move in the opening direction. In summary, only when the main contact of the three-position mechanism 1 is in the ground position and the circuit breaker mechanism 2 is closed, the cable compartment door 3 can be opened. If either of the two conditions is not met, the cable compartment door 3 is forcibly locked in the closed state and cannot be opened by force, eliminating the possibility of the operator mistakenly entering the live compartment.

[0057] In addition, once the sliding frame 53 moves in the door opening direction, it will block the opening plate on the opening drive shaft and restrict the opening of the circuit breaker mechanism 2. Only when the cable compartment door 3 is closed in place, the sliding frame 53 will move to leave the opening plate of the opening drive shaft, allowing the circuit breaker mechanism 2 to open.

[0058] Third interlocking module

[0059] The third interlocking module 6 is installed close to the circuit breaker mechanism 2, specifically, it can be installed on the second bracket 21 of the circuit breaker mechanism 2. The third interlocking module 6 includes a first interlocking baffle 61 and a second interlocking baffle 62, which respectively establish an interlocking mechanism with the first interlocking module 4 through the second transmission member 200 and the third transmission member 300.

[0060] The first interlock baffle 61 has a first hole 611 through which a pin shaft can be passed to mount the first interlock baffle 61 to the first bracket 21 so that the first interlock baffle 61 can pivot about the pin shaft. The first interlock baffle 61 is formed with a first arcuate slot 612 concentric with the first hole 611 at a location spaced from the first hole 611. One end of the second transmission member 200, which is configured as a pull rod, is inserted into the first arcuate slot 612 and can move along the first arcuate slot 612. The other end of the second transmission member 200 is connected to the toggle arm 41 on the first output shaft 14 of the three-position cubicle 1. Rotation of the first output shaft 14 can drive the first interlock baffle 61 to rotate about the pin shaft through the second transmission member 200.

[0061] When the main contact of the three-position cubicle 1 is in the isolated position, rotation of the first output shaft 14 is transmitted to the first interlock baffle 61 through the second transmission member 200, causing the first interlock baffle 61 to pivot to lock the closing lever 22 on the closing drive shaft 23 of the circuit breaker mechanism 2 to restrict the closing of the circuit breaker mechanism 2. In the illustrated embodiment, the first interlock baffle 61 has a bent protruding section and locks the closing lever 22 on the closing drive shaft 23 of the circuit breaker mechanism 2 by pivoting to block the protruding section in the path of rotation of the closing lever 22 to restrict the closing of the circuit breaker mechanism 2. When the main contact of the three-position cubicle 1 is in the grounded or closed position, rotation of the first output shaft 14 is transmitted to the first interlock baffle 61 through the toggle arm 41 and the second transmission member 200, causing the first interlock baffle 61 to pivot to clear the closing lever 22 on the closing drive shaft 23 of the circuit breaker mechanism 2 to allow the closing of the circuit breaker mechanism 2.

[0062] The second interlock baffle 62 has a second hole 621 through which a pin shaft can be passed to mount the second interlock baffle 62 to the first bracket 21 so that the second interlock baffle 62 can pivot about the pin shaft. In one embodiment, the first hole 611 of the first interlock baffle 61 and the second hole 621 of the second interlock baffle 62 are aligned and mounted to the first bracket 21 by means of the same pin shaft. The second interlock baffle 62 is formed with a second arcuate slot 622 concentric with the second hole 621 at a location spaced from the second hole 621. A pin 63 fixed to the second bracket 21 passes through the second arcuate slot 622 and can move along the second arcuate slot 622. One end of the third transmission member 300, which is configured as a pull rod, is connected to the second interlock baffle 62 at a location spaced from the second hole 621 and the second arcuate slot 622, and the other end is connected to the second aperture of the first rotation member 452 or the second aperture 466 of the second rotation member 462. In the illustrated embodiment, the other end of the third transmission member 300 is inserted into the second aperture 466 of the second rotation member 462.

[0063] When the breaker mechanism 2 is open, as described above, the top plate 25, which is pressed down by the second output shaft 26 rotating in the opening direction, pulls the interlock cover plate 44 to expose the closing operation shaft 12 and the grounding operation shaft 13, and allows the operation shafts to be operated. Whether the second catch 461 is pushed by the closing handle 15 or the first catch 451 is pushed by the grounding handle 16, due to the presence of the connecting rod 49, the first rotating piece 452 and the second rotating piece 462 are synchronously driven, and then the second interlock baffle 62 is driven to move to the closing lever 22 on the closing drive shaft 23 of the breaker mechanism 2 by the third transmission member 300, so as to limit the closing of the breaker mechanism 2. In the embodiment shown, the second interlock baffle 62 has a bent protruding section, and the closing lever 22 of the breaker mechanism 2 is locked by pivoting the protruding section to block the rotating path of the closing lever 22, so as to limit the closing of the breaker mechanism 2.

[0064] By means of the interlocking device of the application, the following interlocking mechanisms are realized:

[0065] 1. When the main contacts of the three-position switch are in the closed position or the isolated position, the cable chamber door cannot be opened;

[0066] 2. When the breaker mechanism is open, the cable chamber door cannot be opened;

[0067] 3. When the breaker mechanism is closed, the main contacts cannot be operated;

[0068] 4. When the main contacts of the three-position switch are in the grounding position and the breaker mechanism is closed, the cable chamber door can be opened;

[0069] 5. Only when the cable chamber door is completely closed, the breaker mechanism can be opened (including manual opening and electric opening);

[0070] 6. When the main contacts of the three-position switch are operated, the breaker mechanism cannot be closed;

[0071] 7. When the main contacts of the three-position switch are in the isolated position, the breaker mechanism cannot be closed;

[0072] 8. When the main contacts of the three-position switch are in the isolated position, the grounding or closing can be operated; when the main contacts of the three-position switch are in the grounding position, the closing cannot be operated; and when the main contacts of the three-position switch are in the closed position, the grounding cannot be operated.

[0073] It should be understood that although the present specification is described in terms of various embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

[0074] The above description is only illustrative of the present application and is not intended to limit the scope of the present application. Any variations and modifications of the present application, which are obvious to those skilled in the art, are intended to be within the scope of the present application.

Claims

1. An interlocking device for a ring main unit, the ring main unit comprising: The cabinet includes a cable compartment, which is equipped with an openable and closable cable compartment door (3). The cabinet contains a three-position mechanism (1) and a three-position switch. The three-position switch has a main contact that can move between a closed position, an isolated position and a grounded position. The three-position mechanism (1) includes a first output shaft (14) connected to the main contact, and a closed operation shaft (12) and a grounding operation shaft (13) that drive the first output shaft (14). The circuit breaker mechanism (2) installed in the cabinet includes a second output shaft (26), and a closing mechanism and a opening mechanism that drive the connection of the second output shaft (26); The interlocking device is characterized in that it comprises: The first interlocking module (4) is installed in the cabinet near the three-station mechanism (1); The second interlocking module (5) is connected to the cable room door (3) and is connected to the first interlocking module (4) through the first transmission component (100). The third interlocking module (6) is installed in the cabinet near the circuit breaker mechanism (2) and is connected to the first interlocking module (4) through the second transmission component (200) and the third transmission component (300) respectively. When the cable compartment door (3) is closed, the second interlock module (5) drives the first interlock module (4) to move linearly away from the first output shaft (14) via the first transmission component (100), so as to allow the first output shaft (14) to rotate and drive the main contact to move toward the closed position or the isolated position; when the main contact moves to the closed position or the isolated position, the first interlock module (4) is restricted to move linearly in a direction close to the first output shaft (14) to keep the cable compartment door (3) closed; when the circuit is broken... When the circuit breaker mechanism (2) is open, the second interlocking module (5) is locked by the second output shaft (26) to keep the cable compartment door (3) closed; when the main contact moves to the ground position and the circuit breaker mechanism (2) is closed, the first interlocking module (4) is released to allow the cable compartment door (3) to open, while the second interlocking module (5) locks the opening mechanism; when the main contact is in the isolation position, the first interlocking module (4) drives the third interlocking module (6) to move to lock the closing mechanism through the second transmission component (200); The first interlocking module (4) is also connected to the second output shaft (26) via the fourth transmission member (400). When the circuit breaker mechanism (2) is opened, the second output shaft (26) drives the first interlocking module (4) to leave the closing operation shaft (12) and the grounding operation shaft (13) via the fourth transmission member (400). When the circuit breaker mechanism (2) is closed, the first interlocking module (4) automatically resets and locks the closing operation shaft (12) and the grounding operation shaft (13). When the closing operation shaft (12) and the grounding operation shaft (13) are allowed to operate, the first interlocking module (4) drives the third interlocking module (6) to move to lock the closing mechanism via the third transmission member (300).

2. The interlocking device for the ring main unit according to claim 1, characterized in that, The first interlocking module (4) includes: Cam (40) is engaged with the first output shaft (14); The movable rod (42) is capable of linear movement to move closer to or away from the first output shaft (14), and the movable rod (42) is rigidly connected to one end of the first transmission member (100); A return spring (421) is connected to the movable rod (42) and applies a force to the movable rod (42) to make it move linearly in a direction close to the first output shaft (14).

3. The interlocking device for the ring main unit according to claim 1 or 2, characterized in that, The second interlocking module (5) includes: The sliding frame (53) is rigidly connected to the other end of the first transmission member (100). The sliding frame (53) has a limiting groove (533) and an elongated groove (531) extending at an angle relative to its sliding direction. A stop cam (54) is pivotally mounted in the cabinet and has a rod (542) inserted into the long groove (531) of the sliding frame (53) and can move along the long groove (531); The hanging rod (51) is detachably connected to the cable compartment door (3) and is provided with a limiting rod (511) inserted into the limiting groove (533) of the sliding frame (53). The cable compartment door (3) moving in the closing direction drives the sliding frame (53) via the hanging rod (51). The sliding frame (53) drives the movable rod (42) to move linearly away from the first output shaft (14) via the first transmission member (100), so as to allow the first output shaft (14) to drive the main contact to move to the closing position or the isolation position. When the main contact moves to the closing position or the isolation position, the cam (40) presses against the movable rod (42) and restricts the movable rod (42) to move linearly in the direction close to the first output shaft (14), so as to keep the cable compartment door (3) in the closed state. When the first output shaft (14) drives the main contact to move to the grounding position, the cam (40) moves away from the movable rod (42).

4. The interlocking device for the ring main unit according to claim 3, characterized in that, The second output shaft (26) of the circuit breaker mechanism (2) is connected to a radially extending top plate (25). When the circuit breaker mechanism (2) is tripped, the second output shaft (26) rotates to press the top plate (25) against the sliding frame (53) to keep the cable compartment door (3) closed.

5. The interlocking device for the ring main unit according to claim 3, characterized in that, The tripping mechanism of the circuit breaker mechanism (2) includes a pivotable tripping drive shaft and a tripping plate engaged with the tripping drive shaft. When the cable compartment door (3) is closed in place, the sliding frame (53) releases the tripping plate to allow the circuit breaker mechanism (2) to trip. When the cable compartment door (3) moves in the opening direction, the sliding frame (53) locks the tripping plate to restrict the tripping of the circuit breaker mechanism (2).

6. The interlocking device for the ring main unit according to claim 3, characterized in that, A door-closing microswitch (43) is installed adjacent to the movable rod (42), which is triggered by the movable rod (42) moving away from the first output shaft (14) to provide a signal.

7. The interlocking device for the ring main unit according to claim 1, characterized in that, The first interlocking module (4) includes a crank arm (41) engaged with the first output shaft (14), and the third interlocking module (6) includes a pivotable first interlocking baffle (6) having a first arc groove (612). One end of the second transmission member (200) is connected to the crank arm (41), and the other end is inserted into the first arc groove (612) and can move along the first arc groove (612). When the main contact is in the isolation position, the crank arm (41) drives the first interlocking baffle (6) to pivot to lock the closing mechanism through the second transmission member (200) to restrict the closing of the circuit breaker mechanism (2).

8. The interlocking device for the ring main unit according to claim 1, characterized in that, The first interlocking module (4) includes: A first interlocking assembly (45) is disposed near the grounding operating shaft (13) and includes a first latch (451) and a first rotating member (452). During grounding operation of the grounding operating shaft (13) by the grounding handle (16), the first latch (451) is driven to drive the first rotating member (452) to pivot. The second interlocking assembly (46), located near the closing operation shaft (12), includes a second latch (461) and a second rotating member (462). During operation of the closing operation shaft (12) by the closing handle (15), the second latch (461) is driven to drive the second rotating member (462) to pivot. One of the first rotating member (452) and the second rotating member (462) is connected to one end of the third transmission member (300). A connecting rod (49) is connected between the first rotating member (452) and the second rotating member (462).

9. The interlocking device for the ring main unit according to claim 8, characterized in that, The first rotating member (452) and the second rotating member (462) each include: A shaft (463) is pivotally mounted inside the cabinet. An arm (464) extends radially from the shaft (463) and has a spaced-apart first opening (465) and second opening (466), one of which is for mounting the connecting rod (49) and the other is for mounting the third transmission member (300). A ridge (467) extends from the shaft (463) and gradually approaches the corresponding latch along the operating direction of the closing handle (15) or the grounding handle (16).

10. The interlocking device for the ring main unit according to claim 8, characterized in that, A grounding micro switch (48) is installed adjacent to the first handpiece (451). During the operation of the grounding operating shaft (13) by the grounding handle (16), the first handpiece (451) is driven, and the grounding micro switch (48) is triggered by the first handpiece (451) to provide a signal. A closing microswitch (47) is installed adjacent to the second handpiece (461). During the operation of the closing operation shaft (12) by the closing handle (15), the second handpiece (461) is driven, and the closing microswitch (47) is triggered by the second handpiece (461) to provide a signal.

11. The interlocking device for the ring main unit according to any one of claims 1 to 10, characterized in that, The third interlocking module (6) includes a pivotable second interlocking baffle (62) having a second arcuate groove (622) through which a pin fixed to the cabinet body passes. The pin can move along the second arcuate groove (622). The second interlocking baffle (62) is connected to the other end of the third transmission member (300). During the operation of the closing operation shaft (12) by the closing handle (15) or the operation of the grounding operation shaft (13) by the grounding handle (16), the first interlocking module (4) drives the second interlocking baffle (62) to pivot to lock the closing mechanism to restrict the closing of the circuit breaker mechanism (2).

12. The interlocking device for the ring main unit according to claim 1, characterized in that, The first interlocking module (4) includes a movable interlocking cover plate (44). The second output shaft (26) of the circuit breaker mechanism (2) is connected to a radially extending top plate (25). One end of the fourth transmission member (400) is connected to the top plate (25), and the other end is connected to the interlocking cover plate (44). During the opening of the circuit breaker mechanism (2), the top plate (25) drives the interlocking cover plate (44) away from the closing operation shaft (12) and the grounding operation shaft (13) through the fourth transmission member (400).

13. A ring main unit, comprising: The cabinet includes a cable compartment, which is equipped with an openable and closable cable compartment door (3). The cabinet contains a three-position mechanism (1) and a three-position switch. The three-position switch has a main contact that can move between a closed position, an isolated position and a grounded position. The three-position mechanism (1) includes a first output shaft (14) connected to the main contact, and a closed operation shaft (12) and a grounding operation shaft (13) connected to the first output shaft (14). The circuit breaker mechanism (2) installed in the cabinet includes a second output shaft (26), and a closing mechanism and a opening mechanism that drive the connection to the second output shaft (26); The ring main unit is characterized in that it further includes the interlocking device as described in any one of claims 1 to 12.

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