Mechanical interlocking system for dual-power switch cabinet

Abstract

The invention relates to the field of electrical equipment, in particular to a mechanical interlocking system for a dual-power switch cabinet, which comprises a main power switch cabinet and a standby power switch cabinet which are adjacently arranged, a first circuit breaker and a second circuit breaker are respectively arranged in the two power switch cabinets, a first cabinet internal locking mechanism is arranged in the first circuit breaker, and a second cabinet internal locking mechanism is arranged in the second circuit breaker. A second cabinet inner lock mechanism is arranged in the second circuit breaker; and the inter-cabinet interlocking shaft passes through a space between the two power switch cabinets, and two ends of the inter-cabinet interlocking shaft are respectively connected with the first in-cabinet locking mechanism and the second in-cabinet locking mechanism. The in-cabinet locking mechanism is simple in structure, the existing power switch cabinet and the internal circuit breaker are slightly changed, the in-cabinet locking mechanism is directly preset in the circuit breaker, the cost is low, the function is complete, and an extra interlocking device is not needed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electrical equipment, in particular to a mechanical interlocking system for dual power switch cabinet. BACKGROUND

[0002] With the rapid development of the national economy, the demand for electricity is growing, and higher requirements are put forward for the continuous power supply of the medium voltage system, especially in the specific application fields of power transmission and distribution, such as new energy, security and protection, data center, fire protection, military, financial system, etc. In the medium voltage system, the standby power automatic switching (SPAS) mode is adopted, and through the specific operation of two medium voltage switches, the main power circuit is switched to realize the continuous power supply of the system.

[0003] At present, in the medium voltage system, the implementation of the standby power automatic switching function is mostly realized by adopting the secondary system for collection + control + interlocking (electrical) mode to realize the switching of the power supply circuit. However, for the execution element (medium voltage switch) of the standby power automatic switching function, there is a lack of effective, reliable and simple interlocking (mechanical) design.

[0004] At present, in order to realize the interlocking of the power switch cabinet, a mechanical interlocking device needs to be additionally arranged between the two power switch cabinets, see the prior patent - CN115410842A Mechanical interlocking system of dual power switch cabinet, which will result in high manufacturing cost. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a mechanical interlocking system for dual power switch cabinet to solve the technical problems of complex interlocking structure and poor stability between the standby power automatic switching switches.

[0006] The technical scheme adopted by the present application to solve the technical problem is: A mechanical interlocking system for dual power switch cabinet is provided, comprising Two adjacent main power switch cabinets and standby power switch cabinets, first circuit breakers and second circuit breakers are arranged in the two power switch cabinets respectively, a first cabinet interlocking mechanism is arranged in the first circuit breaker, and a second cabinet interlocking mechanism is arranged in the second circuit breaker; A cabinet interlocking shaft passes through between the two power switch cabinets, and the two ends of the cabinet interlocking shaft are connected with the first cabinet interlocking mechanism and the second cabinet interlocking mechanism respectively, so that the two cabinet interlocking mechanisms move synchronously; When the first circuit breaker is energized in the closing position, the first cabinet interlocking mechanism locks the first closing push plate and simultaneously drives the second cabinet interlocking mechanism to synchronously lock the second closing push plate, so that one of the power switch cabinets is limited to close when the other power switch cabinet is energized in the closing position; When the first circuit breaker is de-energized in the opening position, the first cabinet interlocking mechanism unlocks the first closing push plate and simultaneously drives the second cabinet interlocking mechanism to synchronously unlock the second closing push plate.

[0007] Furthermore, both the first cabinet internal locking mechanism and the second cabinet internal locking mechanism include A cam is mounted on the switch spindle, and a groove is formed on the cam, through which a stop shaft passes. A drive shaft is configured to rotate laterally within the circuit breaker. The drive shaft is equipped with a drive crank arm, a locking plate, and a reset torsion spring. The reset torsion spring is adapted to drive the locking plate to rotate in a reset manner. The end of the drive shaft is adapted to be connected to an interlock shaft between cabinets. The transmission rod has its upper end hinged to the transmission crank arm and its lower end connected to the stop shaft; When the circuit breaker is closed and energized, the main shaft of the switch drives the cam to rotate downward to the closed position. The cam drives the stop shaft and transmission rod to move downward, thereby driving the transmission crank arm and transmission shaft to rotate, and driving the locking plate to lock the closing push plate. When the circuit breaker trips and disconnects power, the switch main shaft drives the cam to rotate upward to the trip position. At this time, the cam unlocks the stop shaft, and the locking plate rotates back to the trip position under the action of the reset torsion spring. The locking plate unlocks the closing push plate and simultaneously drives the stop shaft to reset upward.

[0008] Furthermore, the drive shaft includes The inner shaft of the transmission rotates on the spring operating mechanism module inside the circuit breaker; At least one external transmission shaft, one end of which is detachably connected to the internal transmission shaft, and the other end of which is detachably connected to the interlocking shaft between cabinets.

[0009] Furthermore, both the inner and outer transmission shafts are splined shafts; The inner and outer transmission shafts are connected by interlocking sleeves.

[0010] Furthermore, a flat block is formed at the end of the transmission outer shaft, and a flat groove is formed at the end of the inter-cabinet interlock shaft. The flat block is inserted into the flat groove so that the transmission outer shaft and the inter-cabinet interlock shaft rotate synchronously.

[0011] Furthermore, a support plate is provided inside the circuit breaker, and the inner drive shaft passes through the support plate.

[0012] Furthermore, a closing pin is provided on the closing push plate, and when the power switch cabinet is closed and energized, the locking plate abuts against the closing pin.

[0013] The beneficial effects of this invention are: The mechanical interlocking system for dual power switchgear of this invention has a simple internal locking mechanism structure, requires minimal modification to existing power switchgear and internal circuit breakers, and the internal locking mechanism is directly pre-installed in the circuit breaker, resulting in low cost, full functionality, and no need for additional interlocking devices.

[0014] The two power switch cabinets are pre-installed with internal locking mechanisms. The main power switch cabinet and the backup power switch cabinet are interchangeable in structure, meeting the interchangeability requirements of the switches and the "five protections" requirements. Attached Figure Description

[0015] The invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the mechanical interlock system for the dual-power switchgear of the present invention; Figure 2 This is a schematic diagram of the first circuit breaker; Figure 3 This is a structural diagram of the relationship between the first drive shaft and the first spring operating mechanism module; Figure 4 These are schematic diagrams of the locking mechanisms inside the first and second cabinets. Figure 5 This is a schematic diagram of the first drive shaft; Figure 6 This is a schematic diagram showing the first locking plate abutting against the first closing pin when the circuit is closed; Among them, 1 is the first circuit breaker, 11 is the first switch spindle, 12 is the first spring operating mechanism, 13 is the first closing push plate, 14 is the first closing shaft pin, and 15 is the first support block; 1' Second circuit breaker; 11' Second switch spindle; 12' Second spring operating mechanism; 2. First cabinet internal locking mechanism, 21. First cam, 211. First slide groove, 22. First stop shaft, 23. First transmission rod, 24. First transmission crank arm, 25. First transmission inner shaft, 26. First transmission outer shaft, 27. First locking plate, 28. First reset torsion spring, 29. First interlock sleeve; 2' Second cabinet internal locking mechanism, 21' Second cam, 211' Second slide rail, 22' Second stop shaft, 23' Second transmission rod, 24' Second transmission crank arm, 25' Second transmission inner shaft, 26' Second transmission outer shaft, 27' Second locking plate, 28' Second reset torsion spring, 29' Second interlock sleeve; 3' First support hanging plate, 3' Second support hanging plate; 4. Interlocking shaft between cabinets. Detailed Implementation

[0017] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0018] This application provides a mechanical interlocking system for a dual-power switchgear, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0019] To address the technical problems of complex interlocking structures and poor stability between backup automatic transfer switches in existing technologies, one embodiment of this application provides a mechanical interlocking system for dual-power switchgear. This is described in detail below.

[0020] like Figures 1 to 5 As shown, a mechanical interlock system for a dual-power switchgear includes... Two adjacent main power switch cabinets and a backup power switch cabinet are provided. A first circuit breaker 1 is installed in the main power switch cabinet, and a second circuit breaker 1' is installed in the backup power switch cabinet. A first cabinet internal locking mechanism 2 is installed in the first circuit breaker 1, and a second cabinet internal locking mechanism 2' is installed in the second circuit breaker 1'. The interlocking shaft 4 between the cabinets passes between the two power switch cabinets, and its two ends are respectively connected to the first cabinet internal locking mechanism 2 and the second cabinet internal locking mechanism 2', so that the two cabinet internal locking mechanisms can operate synchronously. When the first circuit breaker 1 is energized in the closed position, the first cabinet internal locking mechanism 2 locks the first closing push plate 13 and simultaneously drives the second cabinet internal locking mechanism 2' to lock the second closing push plate 13', thereby restricting the other power switch cabinet from closing when one power switch cabinet is energized. When the first circuit breaker 1 is de-energized in the open position, the first cabinet internal locking mechanism 2 unlocks the first closing push plate 13 and simultaneously drives the second cabinet internal locking mechanism 2' to unlock the second closing push plate 13'.

[0021] In this embodiment, the structures of the two circuit breakers and the internal locking mechanism are identical.

[0022] Specifically, as an optional implementation method in this embodiment, such as Figure 4 and Figure 5 As shown, the first cabinet internal locking mechanism 2 includes A first cam 21 is disposed on a first switch main shaft 11. A first groove 211 is formed on the first cam 21, and a first stop shaft 22 passes through the first groove 211. The first drive shaft is configured to rotate laterally within the first circuit breaker 1. The first drive shaft is equipped with a first drive crank arm 24, a first locking plate 27, and a first reset torsion spring 28. The first reset torsion spring 28 is adapted to drive the first locking plate 27 to perform reset rotation. The end of the first drive shaft is adapted to be connected to the interlocking shaft 4 between cabinets. The first transmission rod 23 has its upper end hinged to the first transmission crank arm 24 and its lower end connected to the first stop shaft 22. When the first circuit breaker 1 is closed and energized, the first switch main shaft 11 drives the first cam 21 to rotate downward to the closed position. The first cam 21 drives the first stop shaft 22 and the first transmission rod 23 to move downward, thereby driving the first transmission crank arm 24 and the first transmission shaft to rotate, and driving the first locking plate 27 to lock the first closing push plate 13. When the first circuit breaker 1 trips and disconnects power, the first switch main shaft 11 drives the first cam 21 to rotate upward to the trip position. At this time, the first cam 21 unlocks the first stop shaft 22, and the first locking plate 27 rotates and resets to the trip position under the action of the first reset torsion spring 28. The first locking plate 27 unlocks the first closing push plate 13 and simultaneously drives the first stop shaft 22 to reset upward.

[0023] like Figure 4 As shown, the second cabinet internal locking mechanism 2' includes The second cam 21' is disposed on the second switch main shaft 11'. A second slide groove 211' is formed on the second cam 21', and a second stop shaft 22' passes through the second slide groove 211'. The second drive shaft is configured to rotate laterally within the second circuit breaker 1'. The second drive shaft is equipped with a second drive crank arm 24', a second locking plate 27', and a second reset torsion spring 28'. The second reset torsion spring 28' is adapted to drive the second locking plate 27' to perform reset rotation. The end of the second drive shaft is adapted to be connected to the interlock shaft 4 between cabinets. The second transmission rod 23' has its upper end hinged to the second transmission crank arm 24' and its lower end connected to the second stop shaft 22'; When the second circuit breaker 1' is closed and energized, the second switch main shaft 11' drives the second cam 21' to rotate downward to the closed position. The second cam 21' drives the second stop shaft 22' and the second transmission rod 23' to move downward, thereby driving the second transmission crank arm 24' and the second transmission shaft to rotate, and driving the second locking plate 27' to lock the second closing push plate 13'. When the second circuit breaker 1' trips and disconnects the power, the second switch main shaft 11' drives the second cam 21' to rotate upward to the trip position. At this time, the second cam 21' unlocks the second stop shaft 22', and the second locking plate 27' rotates back to the trip position under the action of the second reset torsion spring 28'. The second locking plate 27' unlocks the second closing push plate 13' and simultaneously drives the second stop shaft 22' to reset upward.

[0024] In this embodiment, as Figures 1 to 5 As shown, the first drive shaft and the second drive shaft are connected by the interlocking shaft 4 between the cabinets. When the first cabinet internal locking mechanism 2 performs the closing and opening operations, the first drive shaft drives the second drive shaft to rotate synchronously via the interlocking shaft 4 between the cabinets.

[0025] In this embodiment, the interlocking shaft 4 passes through the cabinets of the two switchgear cabinets and is supported by the cabinets. Specifically, the support is achieved through bearings or support holes on the cabinets. like Figure 1 and Figure 2 As shown in this embodiment, the circuit breaker structure is an existing basic structure, mainly including a frame, a spring operating mechanism module and a switch spindle. The switch spindle is connected to the spring operating mechanism module. The spring operating mechanism module is equipped with a tripping push plate and a closing push plate. When the spring operating mechanism module closes the circuit, it drives the switch spindle to rotate counterclockwise downwards, and when it trips the circuit, it drives the switch spindle to rotate clockwise.

[0026] The spring operating mechanism module is an existing pre-built module unit that can be directly purchased from the market. The spring operating mechanism module has a support block that abuts against the locking plate in the open position. The support blocks on the two spring operating mechanism modules are designated as the first support block 15 and the second support block, respectively.

[0027] Specifically, as an optional implementation method in this embodiment, such as Figure 4 and Figure 5 As shown, The first drive shaft includes The first transmission inner shaft 25 rotates on the first spring operating mechanism 12 module inside the first circuit breaker 1; At least one first transmission outer shaft 26, one end of the first transmission outer shaft 26 is detachably connected to the first transmission inner shaft 25, and the other end of the first transmission outer shaft 26 is detachably connected to the interlock shaft 4 between cabinets.

[0028] The number of first transmission outer shafts 26 can be one or two. If there is only one first transmission outer shaft 26, it needs to be installed on the side closer to the backup power switch cabinet in advance. If there are two first transmission outer shafts 26, the two first transmission outer shafts 26 are respectively on both sides of the first transmission inner shaft 25. In this case, there is no need to consider whether the backup power switch cabinet is located on the left or right side of the main power switch cabinet.

[0029] Specifically, as an optional implementation method in this embodiment, such as Figure 4 and Figure 5 As shown, both the first inner transmission shaft 25 and the first outer transmission shaft 26 are splined shafts; The first inner transmission shaft 25 and the first outer transmission shaft 26 are connected by a first interlocking sleeve 29.

[0030] Specifically, as an optional implementation method in this embodiment, such as Figure 4 and Figure 5As shown, a flat block is formed at the end of the first transmission outer shaft 26, and a flat groove is formed at the end of the inter-cabinet interlock shaft 4. The flat block is inserted into the flat groove so that the first transmission outer shaft 26 and the inter-cabinet interlock shaft 4 rotate synchronously.

[0031] Specifically, as an optional implementation in this embodiment, a first support plate 3 is provided inside the first circuit breaker 1, and the first transmission inner shaft 25 passes through the first support plate 3.

[0032] The first support plate 3 is used to hoist the first transmission inner shaft 25, so that the first transmission inner shaft 25 remains stable within the frame.

[0033] Specifically, as an optional implementation method in this embodiment, such as Figure 6 As shown, a first closing pin 14 is provided on the first closing push plate 13. When the main power switch cabinet is closed and energized, the first locking plate 27 abuts against the first closing pin 14.

[0034] Similarly, such as Figure 4 and Figure 5 As shown, the second drive shaft includes The second transmission inner shaft 25' rotates on the second spring operating mechanism 12' module inside the second circuit breaker 1'; At least one second transmission outer shaft 26', one end of the second transmission outer shaft 26' is detachably connected to the second transmission inner shaft 25', and the other end of the second transmission outer shaft 26' is detachably connected to the interlock shaft 4 between cabinets.

[0035] The second transmission outer shaft 26' has a flat block at its end, and the inter-cabinet interlock shaft 4 has a flat groove at its end. The flat block is inserted into the flat groove so that the second transmission outer shaft 26' and the inter-cabinet interlock shaft 4 rotate synchronously.

[0036] The second inner drive shaft 25' and the second outer drive shaft 26' are connected by a second interlocking sleeve 29'.

[0037] The second circuit breaker 1' is provided with a second support plate 3', through which the second transmission inner shaft 25' passes. The second support plate 3' is used to suspend the second transmission inner shaft 25', so that the second transmission inner shaft 25' remains stable within the frame.

[0038] The second closing push plate 13' is provided with a second closing pin. When the standby power switch cabinet is closed and energized, the second locking plate 27' abuts against the second closing pin.

[0039] The working process of the dual-power switchgear is as follows: The closing action of the main power switch cabinet is initiated by the release of the closing half shaft in the first spring operating mechanism 12 module. As the closing half shaft releases, the first closing push plate 13 undergoes a rapid rotation and reset process at the moment of release, which takes about 20 milliseconds.

[0040] During the closing process, the first switch main shaft 11 drives the first cam 21 to rotate downwards. After rotating a certain angle, the first cam 21 contacts the first stop shaft 22, then drives the first stop shaft 22 to move downwards, simultaneously driving a transmission rod to move downwards, causing the first transmission shaft to rotate, and finally driving the first locking plate 27 to rotate, causing the first locking plate 27 to abut against the first closing shaft pin 14, achieving mechanical forced locking, i.e. Figure 6 As shown.

[0041] When the first locking plate 27 presses against the first closing pin 14 on the first closing push plate 13, the second locking plate 27' of the standby power switch cabinet simultaneously abuts against the second closing pin on the second closing push plate 13' under the drive of the interlocking shaft 4 between cabinets, restricting the standby power switch cabinet from closing. At this time, even if someone accidentally operates the standby power switch cabinet to close, its second closing push plate 13' will not rotate because it is locked by the second locking plate 27'. At this time, the main power switch cabinet is powered on and the standby power switch cabinet is powered off for protection.

[0042] As the main power switchgear trips, the first switch shaft 11 resets upwards. Without the obstruction of the first cam 21, the first stop shaft 22 can move upwards. The first drive shaft rotates under the first reset torsion spring 28, causing the first locking plate 27 to disengage from the first closing pin 14, thus moving the first stop shaft 22 upwards. In its reset state, the first locking plate 27 abuts against the first support block 15. Simultaneously, driven by the inter-cabinet interlock shaft 4, the second locking plate 27' of the standby power switchgear abuts against the second support block.

[0043] In practical applications of the mechanical interlocking system for dual-power switchgear of the present invention, two switchgears can be arranged side by side and have interchangeability, and the two switchgears can be interchanged left and right.

[0044] The inner drive shaft, which serves as the internal locking mechanism of the cabinet, can be pre-installed on the spring operating mechanism module. The cam is pre-installed on the switch main shaft. The remaining parts can be left uninstalled and assembled on-site. With the inner drive shaft and spring operating mechanism module pre-installed, the circuit breaker can be used as a normal circuit breaker. When the circuit breaker is used in a dual-power switch cabinet, it is only necessary to install it on the outer drive shaft, drive crank arm, drive rod, and stop shaft.

[0045] The entire cabinet locking mechanism can be selectively pre-installed within the circuit breaker, offering low cost, full functionality, and eliminating the need for additional interlocking devices.

[0046] The components of the internal locking mechanism are designed to be universal, allowing for left-right interchange to meet switch interchange requirements. They can also be flexibly configured and installed as needed, improving the efficiency of mass design and production of switches and switch cabinets.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A mechanical interlocking system for dual power switchgear cabinet, characterized in that, Comprising Two adjacent main power switch cabinets and standby power switch cabinets, first and second circuit breakers are arranged in the two power switch cabinets respectively, the first circuit breaker is provided with a first cabinet interlocking mechanism, and the second circuit breaker is provided with a second cabinet interlocking mechanism; A cabinet interlocking shaft passes through the two power switch cabinets, and the two ends of the cabinet interlocking shaft are connected with the first cabinet interlocking mechanism and the second cabinet interlocking mechanism respectively, so that the two cabinet interlocking mechanisms move synchronously; When the first circuit breaker is energized in the closing position, the first cabinet interlocking mechanism locks the first closing push plate and simultaneously drives the second cabinet interlocking mechanism to lock the second closing push plate synchronously, so that one of the two power switch cabinets is limited to close when the other power switch cabinet is energized in the closing position; When the first circuit breaker is de-energized in the opening position, the first cabinet interlocking mechanism unlocks the first closing push plate and simultaneously drives the second cabinet interlocking mechanism to unlock the second closing push plate synchronously.

2. The mechanical interlocking system for dual power switch cabinets according to claim 1, characterized in that The first cabinet interlocking mechanism and the second cabinet interlocking mechanism each comprise A cam provided on a switch main shaft, a sliding groove is formed on the cam, and a blocking shaft is arranged in the sliding groove; A transmission shaft, the transmission shaft is arranged to rotate horizontally in the circuit breaker, a transmission crank, a locking plate and a reset torsion spring are arranged on the transmission shaft, the reset torsion spring is suitable for driving the locking plate to rotate to reset, and the end of the transmission shaft is suitable for being connected with the cabinet interlocking shaft; A transmission rod, the upper end of the transmission rod is hinged with the transmission crank, and the lower end of the transmission rod is connected with the blocking shaft; When the circuit breaker is energized in the closing position, the switch main shaft drives the cam to rotate downward to the closing position, the blocking shaft and the transmission rod are driven to move downward by the cam, so as to drive the transmission crank and the transmission shaft to rotate, and drive the locking plate to lock the closing push plate; When the circuit breaker is de-energized in the opening position, the switch main shaft drives the cam to rotate upward to the opening position, at this time, the cam unlocks the blocking shaft, the locking plate rotates to reset to the opening position under the action of the reset torsion spring, the locking plate unlocks the closing push plate, and simultaneously drives the blocking shaft to reset upward.

3. The mechanical interlocking system for dual power switch cabinets according to claim 2, characterized in that The transmission shaft comprises A transmission inner shaft, which rotates on a spring operating mechanism module in the circuit breaker; At least one transmission outer shaft, one end of the transmission outer shaft is detachably connected with the transmission inner shaft, and the other end of the transmission outer shaft is detachably connected with the cabinet interlocking shaft.

4. The mechanical interlocking system for dual power switch cabinets according to claim 3, characterized in that The transmission inner shaft and the transmission outer shaft are spline shafts; The transmission inner shaft and the transmission outer shaft are connected by a connecting sleeve.

5. The mechanical interlocking system for dual power switch cabinets according to claim 3, characterized in that The end of the transmission outer shaft is formed into a flat block, the end of the cabinet interlocking shaft is formed into a flat groove, and the flat block is inserted into the flat groove, so that the transmission outer shaft and the cabinet interlocking shaft rotate synchronously.

6. The mechanical interlocking system for dual power switch cabinets according to claim 3, characterized in that The circuit breaker is provided with a support hanging plate, and the transmission inner shaft passes through the support hanging plate.

7. The mechanical interlocking system for dual power switch cabinets according to claim 2, characterized in that The closing shaft pin is arranged on the closing push plate, and the lock plate abuts against the closing shaft pin when the power switch cabinet is closed and powered on.

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