Power supply and distribution system

Abstract

Provided in the present application is a power supply and distribution system. The power supply and distribution system comprises a first busbar, a second busbar, a controller, and an uninterruptible power supply. The first busbar is connected to a power grid, and the second busbar is connected to a load. The uninterruptible power supply comprises a main circuit, a bypass circuit, and a maintenance bypass circuit. The main circuit is connected to the first busbar by means of a main switch and is connected to the second busbar by means of an output switch. The bypass circuit is connected to the first busbar by means of a bypass switch and is connected to the second busbar by means of the output switch. The maintenance bypass circuit is connected to the first busbar and the second busbar by means of a maintenance bypass switch. Before being turned on, the maintenance bypass switch performs switching between signals to be sent. On the basis of signals before and after switching, the controller can control the uninterruptible power supply to switch, before the maintenance bypass switch is turned on, from the main circuit to the bypass circuit to connect to the first busbar and the second busbar, so as to prevent, during the maintenance of the uninterruptible power supply, the utility power from the power grid from causing voltage surges to an inverter of the uninterruptible power supply.

Description

A power supply and distribution system

[0001] Cross-reference of related applications

[0002] This application claims priority to Chinese Patent Application No. 202421158428.4, filed on May 25, 2024, entitled "A Power Supply and Distribution System", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of power equipment technology, and in particular to a power supply and distribution system. Background Technology

[0004] An uninterruptible power supply (UPS) is a type of power supply containing energy storage devices, primarily used to provide uninterrupted power to equipment with high power stability requirements. When the mains input is normal, the UPS stabilizes the mains voltage and supplies it to the load; in this state, the UPS can be considered an AC voltage regulator, while simultaneously charging the battery. When the mains power is interrupted or fails, the UPS immediately supplies the DC power stored in the battery to the load through an inverter, ensuring the load continues to operate normally and protecting it from damage. Furthermore, the UPS includes a bypass unit with two sets of bidirectional silicon-controlled rectifiers (SCRs). By controlling the inverter to standby mode and activating the SCRs, the UPS can switch from inverter mode to bypass mode, directly supplying mains power to the load.

[0005] Power supply and distribution systems typically consist of multiple uninterruptible power sources connected in parallel. In such systems, switches such as circuit breakers or fuses are usually used to distribute electrical energy. Taking circuit breakers as an example, in addition to controlling the opening and closing of circuits, they also provide certain protective functions. Specifically, circuit breakers can be equipped with mechanical switches, which operators can use to switch the circuit breaker between closed and open states, thereby enabling or discontinuing the circuit.

[0006] However, at the moment the circuit breaker opens or closes, the total voltage of the power supply and distribution system will change instantaneously, which can easily cause overshoot to the inverters and loads in the system and is not conducive to the stability of the system's voltage output. Summary of the Invention

[0007] This application provides a power supply and distribution system and its control method, which switches the circuit of the uninterruptible power supply in advance before the switch is turned on or off, so as to avoid voltage overshoot phenomenon on the inverter of the uninterruptible power supply.

[0008] In one aspect, this application provides a power supply and distribution system. The power supply and distribution system includes a first busbar, a second busbar, a controller, and an uninterruptible power supply (UPS). Specifically, the first busbar is electrically connected to the power grid, and the second busbar is electrically connected to the load. The UPS includes a main circuit, a bypass circuit, and an output switch. The main circuit and bypass circuit are respectively connected to the first busbar, and the main circuit and bypass circuit are connected in parallel and then in series with the output switch, which is connected to the second busbar. The main circuit includes a main switch and an inverter connected in series. The main switch is connected to the first busbar, and the inverter is connected to the output switch. The bypass circuit includes a bypass switch, one end of which is connected to the first busbar, and the other end is connected to the second busbar. The UPS also includes a maintenance bypass circuit, which includes a maintenance bypass switch, one end of which is connected to the first busbar, and the other end is connected to the second busbar. The aforementioned main circuit switch and output switch are used to connect and disconnect the main circuit, the bypass switch and output switch are used to connect and disconnect the bypass circuit, and the maintenance bypass switch is used to connect and disconnect the maintenance bypass circuit. Furthermore, the output switch, main circuit switch, bypass switch, and maintenance bypass switch are each electrically connected to the controller. The controller is used to control the connection of only one of the main circuit and bypass circuit to the first bus and the second bus to form a loop, or to control the bypass circuit and maintenance bypass circuit to be connected in parallel to the first bus and the second bus to form a loop, by controlling the connection or disconnection of the output switch, main circuit switch, bypass switch, and maintenance bypass switch. When the main circuit is connected to the first bus and the second bus, and the maintenance bypass switch is open, during the process of the maintenance bypass switch switching from the open state to the on state, the maintenance bypass switch is used to switch from sending a first signal to the controller to sending a second signal to the controller before the switch is turned on. The first signal and the second signal are different. The controller is used to control the uninterruptible power supply corresponding to the maintenance bypass switch to switch from the main circuit to the bypass circuit before the maintenance bypass switch is turned on when the first signal is switched to the second signal.

[0009] In the power supply and distribution system of this application, the main circuit and bypass circuit of the uninterruptible power supply (UPS) are connected in parallel and then connected to the second busbar via an output switch to form a power supply circuit. The maintenance bypass circuit is connected in parallel with the power supply circuit. By controlling the on / off state of each switch, different circuits can be connected to the first and second buses. In fault repair scenarios, the UPS needs to activate the maintenance bypass circuit and switch the main circuit to the bypass circuit. Before activating the maintenance bypass circuit, only the main circuit is connected to the first and second buses. Activating the maintenance bypass circuit is achieved by turning on the maintenance bypass switch. During the closing process of the maintenance bypass switch, the signal sent by the maintenance bypass switch to the controller can be switched from a first signal to a second signal. When the controller switches from the first signal to the second signal, it can control the main circuit to switch to the bypass circuit before the maintenance bypass switch is turned on, thereby avoiding voltage surges from the mains power grid to the inverter of the main circuit at the moment the maintenance bypass circuit is turned on.

[0010] In a power supply and distribution system, when the main circuit is disconnected from the first and second buses, this can be achieved by controlling the inverter to switch to operating mode and / or controlling the main circuit switch to open. In one possible implementation, the uninterruptible power supply (UPS) switches from the main circuit to the bypass circuit, specifically including: the controller controlling the inverter to switch to standby mode before the maintenance bypass switch is turned on, and controlling the bypass switch to turn on before the maintenance bypass switch is turned on. In this way, the controller can disconnect the main circuit from the first and second buses by controlling the inverter's operating state without disconnecting the main circuit switch, thus facilitating control.

[0011] In the aforementioned power supply and distribution system, the bypass switch may be a single switching device or may include multiple devices. In one possible implementation, the bypass switch includes a circuit breaker and a switching transistor. When the bypass circuit is open, at least one of the circuit breaker and the switching transistor is in the open state. If only one of the circuit breaker and the switching transistor is in the open state, during the process of the bypass switch switching from the open state to the on state, the controller controls the circuit breaker or the switching transistor to turn on before the maintenance bypass switch turns on. Alternatively, if both the circuit breaker and the switching transistor are in the open state, during the process of the bypass switch switching from the open state to the on state, the controller controls the circuit breaker and the switching transistor to turn on respectively before the maintenance bypass switch turns on. In another possible implementation, the bypass switch is a circuit breaker. When the bypass circuit is open, the circuit breaker is in the open state. During the process of the circuit breaker switching from the open state to the on state, the controller controls the circuit breaker to turn on respectively before the maintenance bypass switch turns on. Of course, in other implementations, the bypass switch may include a disconnecting switch and a fuse, or the bypass switch may include a disconnecting switch, a fuse, and a switching transistor.

[0012] In parallel operation mode, when it is necessary to add or remove uninterruptible power supplies (UPS) connected to the first and second buses in the power supply and distribution system, this can be achieved by controlling the main circuit switch to turn on or off. Before turning the main circuit switch on or off, the signal sent to the controller can be switched. During the process of turning the switch on or off, the controller can control the inverters of other UPSs to adjust their output voltage according to the received signal, so that the voltage output from the second bus to the load remains stable at the moment when the UPS is added or removed from the power supply and distribution system. This maintains the output voltage stability of the power supply and distribution system and avoids voltage overshoot or undershoot for the UPS and the load.

[0013] In one possible scenario, uninterruptible power supplies (UPS) can be added to the power supply and distribution system, connecting to both the first and second busbars. Specifically, the power supply and distribution system may include m and n UPSs, where m and n are positive integers greater than or equal to 1. The main circuits of the m UPSs are connected to the first and second busbars respectively, while the main circuits of the n UPSs are not connected to either busbar. In one possible implementation, within at least one of the n UPSs, one of the main circuit switch and the output switch is in a conducting state, while the other is in a disconnected state. During the process of connecting the main circuit of the aforementioned at least one UPS to the first and second busbars, during the switching of the main circuit switch or output switch from a disconnected state to a conducting state, the main circuit switch or output switch is used to switch from sending a third signal to the controller to sending a fourth signal to the controller before the switch is turned on. The third signal and the fourth signal are different. The controller is used to reduce the output voltage of the inverters of the m uninterruptible power supplies (UPS) when the third signal switches to the fourth signal, so that the voltage output by the m UPS to the second bus remains stable after the main circuit of at least one UPS is connected to the first bus and the second bus, to prevent the voltage supplied to the load from being too high. Alternatively, in another possible implementation, the main circuit switch and output switch of at least one of the n UPS are in the open state. During the process of the main circuit of the aforementioned at least one UPS being connected to the first bus and the second bus, during the process of the main circuit switch and output switch switching from the open state to the on state, at least one of the main circuit switch and output switch is used to switch from sending the third signal to sending the fourth signal to the controller before being turned on. The controller is used to reduce the output voltage of the inverters of the m UPS when the third signal switches to the fourth signal, so that the voltage output by the m UPS to the second bus remains stable after the main circuit of at least one UPS is connected to the first bus and the second bus, to prevent the voltage supplied to the load from being too high.

[0014] In the above implementation, the switch that sends the third and fourth signals to the controller can be a first circuit breaker. The first circuit breaker includes a housing, an operating handle, a moving contact assembly, a stationary contact, and a first micro switch. Specifically, the operating handle, moving contact assembly, stationary contact, and first micro switch are located inside the housing, with the operating handle extending out of the housing. The moving contact assembly includes a main shaft and a rotating rod, which are rotatably connected to the housing. The operating handle is drivenly connected to the main shaft. One end of the rotating rod is positioned close to the main shaft, and the other end extends away from the operating handle and has a moving contact thereon, which is used to contact or separate from the stationary contact. The operating handle is used to drive the main shaft to rotate. The main shaft has a boss, which drives the rotating rod to rotate, thereby separating the moving contact from the stationary contact. The main shaft also has a lever, which is used to turn the first micro switch on or off. When the first circuit breaker is in the open state, the moving contact separates from the stationary contact, the boss contacts the rotating rod, and the lever presses the first micro switch to activate it and send a third signal to the controller. During the switching process from the open to the closed state, the operating handle drives the main shaft to rotate, causing the lever to move away from the first micro switch and the rotating rod to rotate towards the stationary contact. This allows the first micro switch to open and send a fourth signal before the moving contact contacts the stationary contact. When the first circuit breaker is in the closed state, the moving contact contacts the stationary contact, and the first micro switch sends a fourth signal to the controller. In this technical solution, during the rotation of the main shaft, the lever gradually moves away from the first micro switch, while the moving contact moves towards the stationary contact. Before the moving contact contacts the stationary contact, the first micro switch opens and can switch the signal sent to the controller. The main shaft continues to rotate, and the moving contact contacts the stationary contact, closing the first circuit breaker. In other words, the first micro switch opens before the moving contact contacts the stationary contact. The controller can receive different signals from the first circuit breaker, and thus adjust the output voltage of the uninterruptible power supply connected to the first bus and the second bus according to the changes in the signal, so as to ensure the stability of the output voltage and improve the voltage overshoot phenomenon of the inverter.

[0015] In another possible scenario, the number of uninterruptible power supplies (UPS) connected to the first and second buses in the power supply and distribution system can be reduced. Specifically, the power supply and distribution system may include N UPSs, where N is a positive integer greater than 1. The main circuits of the aforementioned N UPSs are respectively connected to the first and second buses. In one possible implementation, during the disconnection of the main circuits of M UPSs from the first and second buses, one of the main circuit switches and output switches of the aforementioned M UPSs is disconnected first. This disconnector is used to switch from sending a fourth signal to the controller to sending a third signal to the controller before disconnection. The third signal is different from the fourth signal, where M is a positive integer greater than or equal to 1 and less than N. When the fourth signal is switched to the third signal, the controller controls the output voltage of the inverters of the remaining N UPSs to increase, so that after the main circuits of the M UPSs are disconnected from the first and second buses, the voltage output by the remaining UPSs to the second bus remains stable, preventing the voltage supplied to the load from being too low. Alternatively, in another possible implementation, during the disconnection of the main circuits of M out of the aforementioned N uninterruptible power supplies (UPS) from the first and second buses, the main circuit switches and output switches of the aforementioned M UPSs are simultaneously disconnected. Before disconnection, the main circuit switches and output switches switch from sending a fourth signal to the controller to sending a third signal to the controller. The third signal is different from the fourth signal. M is a positive integer greater than or equal to 1, and M is less than N. The controller, when switching from the fourth signal to the third signal, controls the output voltage of the inverters of the remaining N UPSs to increase, so that after the main circuits of the aforementioned M UPSs are disconnected from the first and second buses, the voltage output by the remaining UPSs to the second bus remains stable, preventing the voltage supplied to the load from being too low.

[0016] In the above implementation, the switch that sends the third and fourth signals to the controller is a second circuit breaker. The second circuit breaker includes a housing, an operating handle, a moving contact assembly, a stationary contact, and a second micro switch. Specifically, the operating handle, moving contact assembly, stationary contact, and second micro switch are located inside the housing, with the operating handle extending out of the housing. The moving contact assembly includes a main shaft and a rotating rod, which are rotatably connected to the housing. The operating handle is drively connected to the main shaft. One end of the rotating rod is positioned close to the main shaft, and the other end extends away from the operating handle and has a moving contact thereon, which is used to contact or separate from the stationary contact. The operating handle drives the main shaft to rotate. The main shaft has a boss, which drives the rotating rod to rotate, causing the moving contact to separate from the stationary contact. The main shaft also has a lever, which is used to turn the second micro switch on or off. When the second circuit breaker is in the closed state, the moving contact is in contact with the stationary contact, the boss and the rotating rod are spaced a set distance apart, and the lever presses the second micro switch to turn it on and send a fourth signal to the controller. During the process of switching the second circuit breaker from the closed state to the open state, the operating handle drives the main shaft to rotate, causing the lever to move away from the second micro switch and the boss to move towards the rotating rod. Before the boss contacts the rotating rod, the second micro switch opens and sends a third signal. When the second circuit breaker is in the open state, the moving contact separates from the stationary contact, and the second micro switch sends a third signal to the controller. In this technical solution, during the rotation of the main shaft, the lever gradually moves away from the second micro switch, while the boss moves towards the rotating rod. Before the boss contacts the rotating rod, the first micro switch opens and can switch the signal sent to the controller. The main shaft continues to rotate, the boss contacts the rotating rod and begins to push the rotating rod to rotate, thereby causing the moving contact to separate from the stationary contact, thus opening the second circuit breaker. In other words, the second micro switch opens before the moving contact separates from the stationary contact. The controller can receive different signals from the second circuit breaker, and thus adjust the output voltage of the uninterruptible power supply connected to the first bus and the second bus according to the changes in the signal, so as to ensure the stability of the output voltage and improve the voltage overshoot phenomenon of the inverter.

[0017] In this application, the maintenance bypass switch can be a third circuit breaker, which includes a housing, an operating handle, a moving contact assembly, a stationary contact, and a third micro switch. Specifically, the operating handle, moving contact assembly, stationary contact, and third micro switch are located inside the housing, with the operating handle extending out of the housing. The moving contact assembly includes a main shaft and a rotating rod, which are rotatably connected to the housing. The operating handle is drively connected to the main shaft. One end of the rotating rod is located near the main shaft, and the other end extends away from the operating handle and has a moving contact thereon, which is used to contact or separate from the stationary contact. The operating handle is used to drive the main shaft to rotate, and the main shaft has a boss that drives the rotating rod to rotate, thereby separating the moving contact from the stationary contact. The main shaft also has a lever for turning the third micro switch on or off. When the third circuit breaker is in the open state, the moving contact separates from the stationary contact, the boss contacts the rotating rod, and the lever presses the third micro switch, causing the third micro switch to turn on and send a first signal to the controller. During the switching process of the third circuit breaker from open to closed, the operating handle drives the main shaft to rotate, causing the lever to move away from the third micro switch and rotate the rotating rod towards the stationary contact. This allows the third micro switch to open and send a second signal before the moving contact contacts the stationary contact. When the third circuit breaker is closed, the moving contact contacts the stationary contact, and the third micro switch sends a first signal to the controller. In this technical solution, during the rotation of the main shaft, the lever gradually moves away from the third micro switch, while the moving contact moves towards the stationary contact. Before the moving contact contacts the stationary contact, the third micro switch opens and can switch the signal sent to the controller. The main shaft continues to rotate, and the moving contact contacts the stationary contact, closing the third circuit breaker. In other words, the third micro switch opens before the moving contact contacts the stationary contact, allowing the controller to receive different signals from the third circuit breaker. This allows the controller to adjust the output voltage of the uninterruptible power supply connected to the first and second buses based on signal changes, ensuring output voltage stability and mitigating voltage overshoot in the inverter.

[0018] In this application, the main circuit switch, output switch, and maintenance bypass switch can be other types of switches besides circuit breakers. For example, the main circuit switch can be a circuit breaker, or it can also include disconnecting switches and fuses. The output switch can be a circuit breaker, or it can also include disconnecting switches and fuses. The maintenance bypass switch can be a circuit breaker, or it can also include disconnecting switches and fuses.

[0019] Secondly, this application also provides a power supply and distribution system. The power supply and distribution system includes a first busbar, a second busbar, a controller, and multiple uninterruptible power supplies (UPS). Specifically, the first busbar is electrically connected to the power grid, and the second busbar is electrically connected to the load. Each of the multiple UPS includes a main circuit, a bypass circuit, and an output switch. The main circuit and bypass circuit are respectively connected to the first busbar, and the main circuit and bypass circuit are connected in parallel and then in series with the output switch, which is connected to the second busbar. The main circuit includes a main switch and an inverter connected in series. The main switch is connected to the first busbar, and the inverter is connected to the output switch. The bypass circuit includes a bypass switch, one end of which is connected to the first busbar, and the other end is connected to the output switch. The main switch and the output switch are used to connect and disconnect the main circuit, and the bypass switch and the output switch are used to connect and disconnect the bypass circuit. The output switch, the main switch, and the bypass switch are all electrically connected to the controller. The controller controls the connection of only one of the main circuit and bypass circuit to the first and second buses to form a loop by controlling the on / off state of the output switch, main circuit switch, and bypass switch. During the process of the output switch switching from the off state to the on state, the output switch switches from sending a third signal to the controller to sending a fourth signal (different from the fourth signal) before the switch is turned on. During the process of the output switch switching from the on state to the off state, the output switch switches from sending a fourth signal to the controller to sending a third signal before the switch is turned off. The controller controls the inverters of the multiple uninterruptible power supplies to adjust the output voltage before the output switches are turned on or off, so as to keep the voltage output by the multiple uninterruptible power supplies to the second bus stable, when the third signal switches to the fourth signal, or when the fourth signal switches to the third signal.

[0020] In the power supply and distribution system of this application, the main circuit and bypass circuit of the uninterruptible power supply (UPS) are connected in parallel and then connected to the second bus via an output switch to form a power supply circuit. In parallel operation mode, when it is necessary to add or remove UPS connections to the first and second buses in the power supply and distribution system, this can be achieved by controlling the main circuit switch to be turned on or off. Before turning the main circuit switch on or off, the signal sent to the controller can be switched. During the process of turning the switch on or off, the controller can control the inverters of other UPS to adjust their output voltage according to the received signal, so that the voltage output from the second bus to the load remains stable at the moment when the UPS is added or removed from the power supply and distribution system, thereby maintaining the output voltage stability of the power supply and distribution system and avoiding voltage overshoot or undershoot for the UPS and the load.

[0021] In one possible scenario, uninterruptible power supplies (UPS) can be added to the power supply and distribution system, connecting to both the first and second busbars. Specifically, the power supply and distribution system includes m UPSs and n UPSs, where m and n are positive integers greater than or equal to 1. The main circuits of the aforementioned m UPSs are connected to the first and second busbars respectively, while the main circuits of the aforementioned n UPSs are not connected to either the first or second busbars. In one possible implementation, within at least one of the n UPSs, the main circuit switch is in the ON state, and the output switch is in the OFF state. During the process of connecting the main circuit of at least one UPS to the first and second busbars, during the process of the output switch switching from the OFF state to the ON state, the output switch is used to switch from sending a third signal to the controller to sending a fourth signal to the controller before being turned on. The controller is used to reduce the output voltage of the inverters of the aforementioned m uninterruptible power supplies (UPS) when the third signal switches to the fourth signal, so as to keep the voltage output by the aforementioned m UPS to the second bus stable after the main circuit of at least one UPS is connected to the first bus and the second bus, thereby preventing the voltage supplied to the load from being too high. Alternatively, in another possible implementation, in at least one of the aforementioned n UPS, the main circuit switch and the output switch are in the open state; during the process of the main circuit of at least one UPS being connected to the first bus and the second bus, during the process of the main circuit switch and the output switch simultaneously switching from the open state to the on state, the output switch is used to switch from sending the third signal to the controller to sending the fourth signal to the controller before being turned on. The controller is used to reduce the output voltage of the inverters of the aforementioned m UPS when the third signal switches to the fourth signal, so as to keep the voltage output by the aforementioned m UPS to the second bus stable after the main circuit of at least one UPS is connected to the first bus and the second bus, thereby preventing the voltage supplied to the load from being too high.

[0022] In another possible scenario, the number of uninterruptible power supplies (UPS) connected to the first and second buses in the power supply and distribution system can be reduced. Specifically, the power supply and distribution system includes N UPSs, where N is a positive integer greater than 1; the main circuits of the N UPSs are respectively connected to the first and second buses. During the process of disconnecting the main circuits of M UPSs from the first and second buses, the output switches of the aforementioned M UPSs are opened first, and the output switches are used to switch from sending a fourth signal to the controller to sending a third signal to the controller before disconnection, where M is a positive integer greater than or equal to 1, and M is less than N. When the fourth signal switches to the third signal, the controller controls the output voltage of the inverters of the remaining N UPSs to increase, so that after the main circuits of the aforementioned M UPSs are disconnected from the first and second buses, the voltage output by the remaining UPSs to the second bus remains stable, preventing the voltage supplied to the load from being too low. Alternatively, in another possible implementation, during the disconnection of the main circuits of M out of the aforementioned N uninterruptible power supplies (UPS) from the first and second buses, the main circuit switches and output switches of the aforementioned M UPS are simultaneously disconnected. Before disconnection, the main circuit switches and output switches switch from sending a fourth signal to the controller to sending a third signal to the controller, where M is a positive integer greater than or equal to 1 and less than N. The controller, upon switching from the fourth signal to the third signal, controls the output voltage of the inverters of the remaining N UPS to increase, so that after the main circuits of the aforementioned M UPS are disconnected from the first and second buses, the voltage output by the remaining UPS to the second bus remains stable, preventing the voltage supplied to the load from being too low. Attached Figure Description

[0023] Figure 1 is a schematic diagram of a power supply and distribution system provided in an embodiment of this application;

[0024] Figure 2 is a schematic diagram of an uninterruptible power supply provided in an embodiment of this application;

[0025] Figure 3 is a schematic diagram of an uninterruptible power supply provided in an embodiment of this application;

[0026] Figure 4 is another schematic diagram of the uninterruptible power supply provided in the embodiment of this application;

[0027] Figure 5 is a schematic diagram of a circuit breaker provided in an embodiment of this application;

[0028] Figure 6 is a schematic diagram of the circuit breaker in Figure 5 along the AA direction;

[0029] Figure 7 is a cross-sectional view of the circuit breaker in Figure 5 along the AA direction;

[0030] Figure 8 is a schematic diagram of a spindle provided in an embodiment of this application;

[0031] Figure 9 is another schematic diagram of the spindle provided in an embodiment of this application;

[0032] Figure 10 is a schematic diagram of a moving contact assembly provided in an embodiment of this application;

[0033] Figure 11 is another schematic diagram of the moving contact assembly provided in an embodiment of this application;

[0034] Figure 12 is a magnified view of the area within the dashed box in Figure 7;

[0035] Figure 13 is a schematic diagram of the travel and level of the first micro switch provided in an embodiment of this application;

[0036] Figure 14 is another cross-sectional view of the circuit breaker in Figure 5 along the AA direction;

[0037] Figure 15 is a magnified view of the area within the dashed box in Figure 14;

[0038] Figure 16 is a schematic diagram of the travel and level of the second micro switch provided in the embodiment of this application.

[0039] Figure reference numerals: 10-Power supply and distribution system; 11-First busbar; 12-Second busbar; 13-Uninterruptible power supply; 30-Circuit breaker; 31-Casing; 32-Operating handle; 33-Operating mechanism; 34-Current-carrying assembly; 35-Arc-extinguishing chamber; 36-First microswitch; 37-Second microswitch; 38-Baffle; 130-User operating surface; 131-Rack; 132-Rectifier; 133-Inverter; 134-Charging circuit; 135-Battery; 136-Switching transistor; 310-Circuit breaker operating surface; 341 - Moving contact assembly 342 - Stationary contact 361 - First fixed plate 362 - First moving contact 363 - First stationary contact 364 - First spring 371 - Second fixed plate 372 - Second moving contact 373 - Second stationary contact 374 - Second spring 381 - Opening 3411 - Moving contact 3412 - Main shaft 3413 - Rotating rod 3414 - Third spring 3611 - First limiting rib 3711 - Second limiting rib 34121 - Boss 34122 - Lever Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0041] To facilitate understanding of the circuit breakers and power equipment provided in the embodiments of this application, their application scenarios are described below. The circuit breakers and power equipment provided in the embodiments of this application can be widely used in various power supply and distribution systems. In one example provided in this application, the circuit breaker can be used in the power supply and distribution system of a data center to connect, carry, and disconnect the current between the power grid and the data center. Figure 1 is a schematic diagram of a power supply and distribution system provided in an embodiment of this application. As shown in Figure 1, the power supply and distribution system 10 may include a first busbar 11, a second busbar 12, a controller (not shown in the figure), and at least one uninterruptible power supply (UPS) 13. When the power supply and distribution system 10 includes multiple UPSs 13, these UPSs 13 are connected in parallel to the first busbar 11 and the second busbar 12. Specifically, the first busbar 11 is connected to the power grid, the second busbar 12 is connected to the load, and the multiple UPSs 13 are used to stabilize the mains power input from the power grid and output it to the load, while simultaneously charging the battery in the UPS 13.

[0042] Figure 2 is a schematic diagram of an uninterruptible power supply (UPS) provided in an embodiment of this application. As shown in Figure 2, the UPS 13 includes a cabinet 131, and a power supply, controller, multiple power modules (Q1, ..., Qn), and multiple circuit breakers (K1, ..., Km) located within the cabinet 131. The side of the cabinet 131 facing the operator is the user operating surface 130. In this application, taking the cabinet 131 placed on the ground as an example, the dimension of the user operating surface 130 parallel to the ground is its width, the dimension of the user operating surface 130 perpendicular to the ground is its height, and the dimension of the cabinet 131 perpendicular to the user operating surface 130 is its depth. The aforementioned multiple power modules are stacked sequentially along the height direction H of the cabinet 131, and the aforementioned multiple circuit breakers are sequentially placed along the width direction W of the cabinet 131 on one side of the multiple power modules. The power modules are used to convert the voltage from the power grid to output an adapted voltage to the load device. Specifically, the power modules may be AC / AC modules or AC / DC modules. The power supply is used to power the aforementioned power modules. Each of the aforementioned power modules is correspondingly and electrically connected to one of the aforementioned circuit breakers. The power supply and the aforementioned circuit breakers are each electrically connected to the controller.

[0043] Figure 3 is a schematic diagram of an uninterruptible power supply (UPS) provided in an embodiment of this application, and Figure 4 is another schematic diagram of a UPS provided in an embodiment of this application. As shown in Figures 3 and 4, the UPS 13 includes a main circuit C1, a bypass circuit C2, and a maintenance bypass circuit C3. The main circuit C1 and the bypass circuit C2 are respectively connected to the first bus 11. The main circuit C1 and the bypass circuit C2 are connected in parallel and then connected in series with the output switch K3. The output switch K3 is connected to the second bus 12 to form a power supply circuit. The maintenance bypass circuit C3 is connected in parallel with the power supply circuit. Each of the main circuit C1, the bypass circuit C2, and the maintenance bypass circuit C3 is equipped with a corresponding switch. Specifically, the main circuit C1 includes a main switch K1 and an inverter 133 connected in series. Further, the main circuit C1 also includes a rectifier 132, and the main switch K1, the rectifier 132, and the inverter 133 are connected in series. The main circuit switch K1 is connected to the first bus 11, and the inverter 133 is connected to the output switch K3. The main circuit C1 also includes multiple power modules connected in parallel and series. The bypass circuit C2 includes a bypass switch K2, one end of which is connected to the first bus 11, and the other end is connected to the output switch K3. Further, the bypass circuit C2 may also include a switching transistor 136 connected in series with the bypass switch K2, with the bypass switch K2 connected to the first bus 11 and the switching transistor 136 connected to the output switch K3. In one specific embodiment, the switching transistor 136 can be a silicon controlled rectifier (SCR). When the bypass circuit C2 is connected to the first bus 11 and the second bus 12, the switching transistor 136 supplies power from the grid to the load, wherein the switching transistor 136 can adjust the electrical parameters input from the first bus 11 to the electrical parameters required by the load. The maintenance bypass circuit C3 includes a maintenance bypass switch K4, one end of which is connected to the first bus 11, and the other end is connected to the second bus 12. Additionally, the uninterruptible power supply 13 includes a charging circuit 134 and a battery 135 connected in series. The charging circuit 134 is connected between the rectifier 132 and the inverter 133. The main circuit switch K1 and the output switch K3 are used to connect and disconnect the main circuit C1, the bypass switch K2 and the output switch K3 are used to connect and disconnect the bypass circuit C3, and the maintenance bypass switch K4 is used to connect and disconnect the maintenance bypass circuit C3. When the main circuit C1 is connected to the first bus 11 and the second bus 12, the rectifier 132 outputs power to the inverter 133 and the charging circuit 134, respectively. That is, part of the mains power input from the first bus 11 is output to the load through the uninterruptible power supply 13, and the other part charges the battery 135 within the uninterruptible power supply 13. When the mains power is interrupted or there is a power outage, the uninterruptible power supply 13 can output the electrical energy stored in the battery 135 to the load through the inverter 133.

[0044] In this application, "circuit connected to the first busbar 11 and the second busbar 12" means that the switch on the circuit is in a conducting state, so that the electricity from the first busbar 11 is output to the second busbar 12 after passing through the electrical components of the circuit. "Connection" refers to the physical connection between components, which may actually be in a powered-on state or a de-powered state.

[0045] When it is necessary to connect the power grid (or power supply) to the data center, the main switch K1 and output switch K3 can be switched to the closed state; when it is necessary to disconnect the power grid from the data center, the main switch K1 or output switch K3 can be switched to the open state. In this way, the power supply status of the data center is controlled by controlling the on and off states of the switches. When the data center's electrical equipment needs inspection or maintenance, the main switch K1 can be switched to the open state, and the bypass switch K2, output switch K3, and maintenance bypass switch K4 can be switched to the closed state to facilitate inspection and maintenance of the electrical equipment.

[0046] When different circuits of the uninterruptible power supply 13 are connected to the first bus 11 and the second bus 12, the on / off states of each switch and device are different. When the main circuit C1 of the uninterruptible power supply 13 is in operation, the main switch K1 and the output switch K3 are in the ON state, and the inverter 133 is in operation, that is, the main circuit C1 is connected to the first bus 11 and the second bus 12. At this time, the bypass circuit C2 is not connected to the first bus 11 and the second bus 12. Specifically, in one embodiment, the bypass switch K2 may be in the OFF state, or in another embodiment, the bypass switch K2 may be in the ON state and the switching transistor 136 may be in the OFF state.

[0047] When the bypass circuit C2 of the uninterruptible power supply 13 is in operation, the bypass switch K2 and the output switch K3 are in the ON state, and the switching transistor 136 is in the ON state. That is, the bypass circuit C2 is connected to the first bus 11 and the second bus 12. At this time, the main circuit C1 is not connected to the first bus 11 and the second bus 12. Specifically, in one embodiment, the main switch K1 may be in the OFF state, or in another embodiment, the main switch K1 may be in the ON state and the inverter 133 may be in the standby state.

[0048] When the uninterruptible power supply 13 fails, the maintenance bypass circuit C3 is activated. At this time, the maintenance bypass circuit C3 is in a conducting state, meaning it is connected to the first bus 11 and the second bus 12. Meanwhile, the main circuit C1 is not connected to the first bus 11 and the second bus 12, and the bypass circuit C2 is connected to both. In the main circuit C1, in one embodiment, the main switch K1 may be in an open state; or, in another embodiment, the main switch K1 may be in a conducting state and the inverter 133 may be in a standby state. In the bypass circuit C2, the bypass switch K2 is in a conducting state, and the switching transistor 136 is in a conducting state.

[0049] When an uninterruptible power supply (UPS) switches its circuit, the switch sends a signal to the power supply and distribution system at the instant of closing or opening. However, by the time the controller of the power supply and distribution system receives this signal, the total voltage in the system has already undergone a momentary change. This can easily cause voltage overshoot to the UPS inverter and the load in the system, which is detrimental to the system's safety and voltage output stability. Therefore, this application provides a power supply and distribution system and its control method to switch the UPS circuit in advance before the switch is turned on or off, thereby maintaining the output voltage stability of the power supply and distribution system and avoiding voltage overshoot to the UPS and the load.

[0050] It should be noted that the terminology used in the following embodiments is for the purpose of describing specific embodiments only and is not intended to be a limitation of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise.

[0051] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0052] Please refer to Figures 3 and 4. The main circuit switch K1, bypass switch K2, output switch K3, and maintenance bypass switch K4 of the uninterruptible power supply 13 are electrically connected to the controller. The controller is used to control the main circuit C1 and bypass circuit C3 to be connected to the first bus 11 and the second bus 12 to form a loop by controlling the conduction or disconnection of the main circuit switch K1, bypass switch K2, output switch K3, and maintenance bypass switch K4, or to control the bypass circuit C3 and maintenance bypass circuit C3 to be connected in parallel to the first bus 11 and the second bus 12 to form a loop. When the main circuit C1 is connected to the first bus 11 and the second bus 12, and the maintenance bypass switch K4 is open, during the process of switching the maintenance bypass switch K4 from the open state to the on state, the maintenance bypass switch K4 is used to switch from sending a first signal to sending a second signal to the controller before being turned on. The first signal and the second signal are different. The controller can be used to control the uninterruptible power supply 13 corresponding to the maintenance bypass switch K4 to switch from the main circuit C1 to the bypass circuit C2 before the maintenance bypass switch K4 is turned on when the first signal is switched to the second signal.

[0053] In fault repair scenarios, the uninterruptible power supply 13 needs to activate the maintenance bypass circuit C3 and switch the main circuit C1 to the bypass circuit C2. In one embodiment, before activating the maintenance bypass circuit C3, the main switch K1, bypass switch K2, and output switch K3 in the power supply circuit are all in the on state, but only the main circuit C1 is connected to the first bus 11 and the second bus 12. Activating the maintenance bypass circuit C3 is achieved by turning on the maintenance bypass switch K4. When the maintenance bypass switch K4 performs a closing operation (i.e., when the maintenance bypass switch K4 switches from the open state to the closed state), the signal sent by the maintenance bypass switch K4 to the controller changes from a first signal to a second signal. After receiving the first and second signals, the controller controls the main circuit C1 to switch to the bypass circuit C2 before the maintenance bypass switch K4 is turned on when the first signal changes to the second signal, thereby avoiding voltage surges from the mains power to the inverter 133 of the main circuit at the moment the maintenance bypass circuit C3 is turned on.

[0054] In the aforementioned fault diagnosis and repair scenario, the controller can directly switch the operating states of the inverter 133 and the switching transistor 136 to switch between the main circuit C1 and the bypass circuit C2. Specifically, the controller controls the inverter 133 to switch to standby mode before the maintenance bypass switch K4 is turned on. When the inverter 133 is in standby mode, even if the main switch K1 and the output switch K3 are turned on, the main circuit C1 will not supply mains power to the load, thus disconnecting the main circuit C1 from the first bus 11 and the second bus 12. Furthermore, the controller also controls the switching transistor 136 to turn on before the maintenance bypass switch K4 is turned on, so that the bypass circuit C2 is connected to the first bus 11 and the second bus 12.

[0055] In another embodiment, before the maintenance bypass circuit C3 is activated, only the main circuit C1 is connected to the first bus 11 and the second bus 12. The main switch K1 and output switch K3 are both in the ON state, while the bypass switch K2 is in the OFF state. At this time, the switching transistor 136 can be turned on or off. When the maintenance bypass switch K4 performs a closing operation (i.e., during the process of switching the maintenance bypass switch K4 from the OFF state to the OFF state), the signal sent by the maintenance bypass switch K4 to the controller is switched from the first signal to the second signal. After receiving the first signal and the second signal, when the first signal switches to the second signal, the controller controls the inverter 133 to switch to standby mode before the maintenance bypass switch K4 is turned on, controls the bypass switch K2 to switch from open to on state before the maintenance bypass switch K4 is turned on, and (when the switching transistor 136 is open before the maintenance bypass switch K4 is closed) controls the switching transistor 136 to turn on before the maintenance bypass switch K4 is turned on, thereby avoiding voltage surges from the mains power to the inverter 133 on the main circuit at the moment the maintenance bypass circuit C3 is turned on.

[0056] In actual operation, the power supply and distribution system 10 includes multiple uninterruptible power supplies (UPS) 13, and these UPS 13 operate in parallel mode, that is, the multiple UPS 13 are connected in parallel to the first busbar 11 and the second busbar 12. In parallel mode, the power supply and distribution system 10 can increase or decrease the number of UPS 13 according to actual needs.

[0057] In parallel operation mode, when it is necessary to increase or decrease the number of uninterruptible power supplies (UPS) 13 operating in the power supply and distribution system 10, this can be achieved by controlling the switching of the main circuit C1. For example, the output switch K3 can be used to switch the signal sent to the controller before switching on or off. The controller is used to control the inverter 133 of other UPS 13 to adjust the output voltage according to the different signals before and after the switch, so that the voltage output from the second bus 12 to the load remains stable at the moment when the UPS 13 is increased or decreased, thereby maintaining the output voltage stability of the power supply and distribution system 10 and avoiding voltage overshoot or undershoot for the UPS 13 and the load. Similarly, the main switch K1 can also be used to switch the signal sent to the controller before switching on or off, which will not be elaborated here.

[0058] Taking the addition of uninterruptible power supplies (UPS) 13 connected to the first busbar 11 and the second busbar 12 in the power supply and distribution system 10 as an example, the power supply and distribution system 10 may include m UPS 13 and n UPS 13, where m and n are positive integers greater than or equal to 1. The main circuits C1 of the m UPS 13 are respectively connected to the first busbar 11 and the second busbar 12, while the main circuits C1 of the n UPS 13 are not connected to the first busbar 11 and the second busbar 12.

[0059] In one embodiment, in at least one of the n uninterruptible power supplies (UPS) 13, one of the main circuit switch K1 and the output switch K3 is in a conducting state, while the other is in a disconnected state. During the process of the main circuit C1 of the aforementioned at least one UPS 13 being connected to the first bus 11 and the second bus 12, during the process of the other disconnecting device switching from a disconnected state to a conducting state, this other device is used to switch from sending a third signal to the controller to sending a fourth signal to the controller before being turned on. The third signal is different from the fourth signal. The controller is used to control the output voltage of the inverter 133 of the m UPS 13 to decrease when the third signal switches to the fourth signal, so that after the main circuit C1 of at least one UPS 13 is connected to the first bus 11 and the second bus 12, the voltage output by the m UPS 13 to the second bus 12 remains stable, preventing excessively high voltage supplied to the load.

[0060] In another embodiment, in at least one of the n uninterruptible power supplies 13, the main circuit switch K1 and the output switch K3 can be simultaneously in the off state. During the process of the main circuit C1 of the aforementioned at least one uninterruptible power supply 13 being connected to the first bus 11 and the second bus 12, during the simultaneous switching of the main circuit switch K1 and the output switch K3 from the off state to the on state, at least one of the main circuit switch K1 and the output switch K3 is used to switch from sending a third signal to sending a fourth signal to the controller before being turned on. The controller is used to control the output voltage of the inverter 133 of the aforementioned m uninterruptible power supplies 13 to decrease when the third signal is switched to the fourth signal, so that after the main circuit C1 of at least one uninterruptible power supply 13 is connected to the first bus 11 and the second bus 12, the voltage output by the aforementioned m uninterruptible power supplies 13 to the second bus 12 remains stable, preventing excessively high voltage supplied to the load. Of course, in actual operation of this embodiment, the main circuit switch K1 and the output switch K3 may also be closed in a sequential order. At this time, the controller controls the output voltage of inverter 133 based on the third and fourth signals sent by the latter.

[0061] Taking the reduction of uninterruptible power supplies 13 connected to the first busbar 11 and the second busbar 12 in the power supply and distribution system 10 as an example, the power supply and distribution system 10 may include N uninterruptible power supplies 13, where N is a positive integer greater than 1. The main circuit C1 of the aforementioned N uninterruptible power supplies 13 has been connected to the first busbar 11 and the second busbar 12 respectively.

[0062] In one embodiment, during the disconnection of the main circuit C1 of M out of the aforementioned N uninterruptible power supplies 13 from the first bus 11 and the second bus 12, one of the main circuit switch K1 and the output switch K3 of the aforementioned M uninterruptible power supplies 13 is disconnected first. This disconnecting switch is used to switch from sending a fourth signal to the controller to sending a third signal to the controller before disconnection. The third signal is different from the fourth signal, M is a positive integer greater than or equal to 1, and M is less than N. When the fourth signal is switched to the third signal, the controller controls the output voltage of the inverter 133 of the remaining N uninterruptible power supplies 13 to increase, so that after the main circuit C1 of the M uninterruptible power supplies 13 is disconnected from the first bus 11 and the second bus 12, the voltage output by the remaining uninterruptible power supplies 13 to the second bus 12 remains stable, preventing the voltage supplied to the load from being too low.

[0063] In another embodiment, during the disconnection of the main circuit C1 of M out of the aforementioned N uninterruptible power supplies 13 from the first bus 11 and the second bus 12, the main circuit switch K1 and the output switch K3 of the aforementioned M uninterruptible power supplies 13 are disconnected. Before disconnection, the main circuit switch K1 and the output switch K3 are switched from sending a fourth signal to the controller to sending a third signal to the controller. The third signal is different from the fourth signal. M is a positive integer greater than or equal to 1, and M is less than N. The controller is used to increase the output voltage of the inverter 133 of the remaining uninterruptible power supplies 13 when the fourth signal is switched to the third signal. This ensures that after the main circuit C1 of the aforementioned M uninterruptible power supplies 13 is disconnected from the first bus 11 and the second bus 12, the voltage output by the remaining uninterruptible power supplies 13 to the second bus 12 remains stable, preventing the voltage supplied to the load from being too low.

[0064] In this application, the specific types of the main circuit switch K1, bypass switch K2, output switch K3, and maintenance bypass switch K4 are not limited. For example, the main circuit switch K1 can be a circuit breaker, or the main circuit switch K1 can include a disconnecting switch and a fuse. The bypass switch K2 can be a circuit breaker, or the bypass switch K2 can include a disconnecting switch and a fuse. The output switch K3 can be a circuit breaker, or the output switch K3 can include a disconnecting switch and a fuse. The maintenance bypass switch K4 can be a circuit breaker, or the maintenance bypass switch K4 can include a disconnecting switch and a fuse.

[0065] The signals sent to the controller by the main circuit switch K1, output switch K3, and maintenance bypass switch K4 before they are turned on or off can be switched using microswitches. In one embodiment, each of the main circuit switch K1, output switch K3, and maintenance bypass switch K4 may include a microswitch. The first signal, second signal, third signal, and fourth signal can all be level signals of the microswitch. When the aforementioned main circuit switch K1, output switch K3, and maintenance bypass switch K4 are in the on state, the microswitch is used to send a first level signal to the controller. When the aforementioned switches are in the off state, the microswitch is used to send a second level signal to the controller, wherein the first level signal and the second level signal are different. During the process of the aforementioned switches switching from a closed state to an open state, the microswitch is used to switch from sending a first level signal to sending a second level signal to sending a second level signal to sending a second level signal to sending a second level signal to sending a second level signal to sending a first ... The controller further controls the inverter 133 and the switching transistor 136 based on the switching changes of the first and second level signals. The use of microswitches avoids complicating the structure of the main switch K1, output switch K3, and maintenance bypass switch K4. Furthermore, by observing the level signal changes of the microswitches, the controller can directly determine whether the corresponding switch is performing a closing or opening operation, thereby controlling the circuit switching of the uninterruptible power supply 13.

[0066] In one embodiment, the main circuit switch K1, the output switch K3, and the maintenance bypass switch K4 are all circuit breakers. Figure 5 is a schematic diagram of a circuit breaker provided in an embodiment of this application, and Figure 6 is a schematic diagram of the circuit breaker in Figure 5 along the AA direction. As shown in Figures 5 and 6, the circuit breaker 30 includes a housing 31, an operating handle 32, an operating mechanism 33, and a current-carrying assembly 34. Specifically, the operating handle 32 and the operating mechanism 33 are connected. The current-carrying assembly 34 includes a moving contact assembly 341 and a stationary contact 342. The moving contact assembly 341 is rotatable relative to the housing 31. The moving contact assembly 341 includes a moving contact 3411. The stationary contact 342 can be disposed along the depth direction of the circuit breaker 30 on the side of the moving contact assembly 341 away from the operating mechanism 33, or the stationary contact 342 can also be disposed along the height direction of the circuit breaker 30 on the side of the moving contact assembly 341 away from the operating mechanism 33. In one embodiment, the end of the operating handle 32 furthest from the operating mechanism 33 can extend out of the housing 31, allowing the operator to push the operating handle 32 to perform closing and opening operations. In another embodiment, the housing 31 is provided with a knob for manual operation of the circuit breaker 30. Specifically, the end of the operating handle 32 furthest from the operating mechanism 33 is connected to the knob. When the operator manually operates the knob, rotating the knob drives the operating handle 32 to move along the height h of the circuit breaker 30. In another embodiment, the circuit breaker 30 may further include a remote controller and an electric operating device. The electric operating device is connected to the operating handle 32 and is communicatively connected to the remote controller to electrically operate the circuit breaker 30 to close and open. When the operator performs electric operation, a closing command or an opening command is sent to the remote controller. The remote controller can control the electric operating device to push the operating handle 32. In this embodiment, the operator can issue commands from close proximity to the circuit breaker 30 or remotely via a communication device.

[0067] As shown in Figure 6, in one embodiment, at least a portion of the operating handle 32 near the operating mechanism 33, the operating mechanism 33, and the moving contact assembly 341 are sequentially disposed within the housing 31 along the depth direction d of the circuit breaker 30. The operating handle 32 controls the operating mechanism 33 to move the moving contact assembly 341, causing the moving contact 3411 to contact or separate from the stationary contact 342. Further, the circuit breaker 30 may also include an arc-extinguishing chamber 35, located along the depth direction d of the circuit breaker 30 on the side of the moving contact assembly 341 away from the operating mechanism 33. The arc-extinguishing chamber 35 is used to eliminate the electric arc generated when the moving contact 3411 separates from the stationary contact 342. In one embodiment, the stationary contact 342 is located on one side of the arc-extinguishing chamber 35 along the height direction h of the circuit breaker 30. The movement trajectory of the moving contact 3411 extends along the height direction h of the circuit breaker 30 from the stationary contact 342 to the other side of the arc-extinguishing chamber 35.

[0068] In this application, the side of the operating handle 32 extending out of the housing 31 is the circuit breaker operating surface 310. Taking the circuit breaker operating surface 310 as an example, the dimension of the circuit breaker 30 along the pushing direction of the operating handle 32 is the height, the dimension perpendicular to the height direction h is the width, and the dimension perpendicular to the circuit breaker operating surface 310 is the depth. In other words, the operating handle 32, the operating mechanism 33, the current-carrying assembly 34, and the arc-extinguishing chamber 35 are arranged sequentially along the depth direction d of the circuit breaker 30. As shown in Figure 3, when the circuit breaker 30 is placed in the cabinet 131, in one embodiment, the height direction h of the circuit breaker 30 can be in the same direction as the width direction W of the cabinet 131, the width direction w of the circuit breaker 30 can be in the same direction as the height direction H of the cabinet 131, and the depth direction d of the circuit breaker 30 can be in the same direction as the depth direction D of the cabinet 131. Therefore, when the operator performs a closing or opening operation on the circuit breaker 30, the operator pushes the operating handle 32 along the width direction W of the cabinet 131. When the operating handle 32 is pushed to perform a tripping or closing operation, the operating mechanism 33 moves with the operating handle 32 to cause the moving contact 3411 to separate from or contact the stationary contact 342. When the moving contact 3411 is in contact with the stationary contact 342, the circuit breaker 30 is in the closed state; when the moving contact 3411 is separated from the stationary contact 342, the circuit breaker 30 is in the tripping state. Of course, in another embodiment, the width direction w of the circuit breaker 30 can be in the same direction as the width direction W of the cabinet 131, the height direction h of the circuit breaker 30 can be in the same direction as the height direction H of the cabinet 131, and the depth direction d of the circuit breaker 30 can be in the same direction as the depth direction D of the cabinet 131. This application does not impose specific limitations.

[0069] As shown in Figure 6, when the operating handle 32, operating mechanism 33, current-carrying assembly 34, and arc-extinguishing chamber 35 are arranged sequentially along the depth direction d of the circuit breaker 30, the housing 31 may include a front cover 311 and a rear cover assembly 312 arranged sequentially along the depth direction d of the circuit breaker 30. At least the portion of the operating handle 32 near the operating mechanism 33, the operating mechanism 33, the moving contact assembly 341, and the arc-extinguishing chamber 35 are arranged sequentially along the depth direction d of the circuit breaker 30 within the rear cover assembly 312, and the operating handle 32 is positioned near the front cover 311. Therefore, the operating handle 32, operating mechanism 33, moving contact assembly 341, and arc-extinguishing chamber 35 are considered to be arranged in a layered manner, thereby reducing the height of the circuit breaker 30, reducing the space occupied by the circuit breaker 30, and increasing the number of circuit breakers 30 that can be arranged in the cabinet 131. Specifically, the operating handle 32 is located in the first layer (electric or manual operation layer), the operating mechanism 33 is located in the second layer (operation layer), a portion of the current-carrying assembly 34 is located in the third layer (current-carrying layer), and the arc-extinguishing chamber 35 is located in the fourth layer (arc-extinguishing layer). The moving contact 3411 can extend along the depth direction d of the circuit breaker 30, thus reducing its size in the height direction h of the circuit breaker 30, which is beneficial for minimizing the height of the circuit breaker 30. Furthermore, while achieving miniaturization, the moving contact 3411 also allows for a larger driving force arm for closing the circuit with the stationary contact 342, thereby reducing the driving force of the operating mechanism 33 and improving its operational stability.

[0070] Figure 7 is a cross-sectional view of the circuit breaker in Figure 5 along the AA direction. The operating handle, operating mechanism, and arc-extinguishing chamber are omitted in Figure 7, and the circuit breaker is in the closed state. As shown in Figure 7, the moving contact assembly 341 includes a main shaft 3412 and a rotating rod 3413, which are rotatably connected to the housing 31. One end of the rotating rod 3413 is located near the main shaft 3412. The rotating rod 3413 extends away from the operating mechanism 33, and the moving contact 3411 is located at the end of the rotating rod 3413 away from the operating mechanism 33. The operating mechanism 33 is drively connected to the main shaft 3412. The operating handle 32 is used to control the operating mechanism 33 to drive the main shaft 3412 to rotate, so that the moving contact 3411 contacts or separates from the stationary contact 342.

[0071] Figure 8 is a schematic diagram of a spindle provided in an embodiment of this application, and Figure 9 is another schematic diagram of a spindle provided in an embodiment of this application. Figure 9 shows a cross-sectional view of the spindle in Figure 8 along the BB direction. As shown in Figures 8 and 9, the spindle 3412 is provided with a boss 34121, which is used to contact the rotating rod 3413 and drive the rotating rod 3413 to rotate, so that the moving contact 3411 is separated from the stationary contact 342. The circuit breaker 30 also includes a first micro switch 36, which is electrically connected to the controller. The spindle 3412 is provided with a lever 34122, which is used to turn the first micro switch 36 on or off. When the circuit breaker 30 is in the closed state, the moving contact 3411 is in contact with the stationary contact 342, the boss 34121 is spaced a set distance from the rotating rod 3413, and the lever 34122 presses the first micro switch 36 to turn it on.

[0072] Figure 10 is a schematic diagram of a moving contact assembly provided in an embodiment of this application, and Figure 11 is another schematic diagram of a moving contact assembly provided in an embodiment of this application. Figure 11 shows a cross-sectional view of the main shaft in Figure 10 along the CC direction. As shown in Figures 10 and 11, when the circuit breaker 30 performs a tripping operation, the circuit breaker 30 switches from a closed state to a tripping state. During the process of the circuit breaker 30 switching from a closed state to a tripping state, the operating mechanism 33 drives the main shaft 3412 to rotate along a first direction (clockwise as shown in Figure 7), causing the lever 34122 to gradually move away from the first micro switch 36, and causing the boss 34121 to move toward the rotating rod 3413. Before the boss 34121 contacts the rotating rod 3413, the first micro switch 36 is opened and switches from sending a first level signal to the controller to sending a second level signal to the controller. Thus, during the rotation of the spindle 3412, the lever 34122 gradually moves away from the first micro switch 36, while the boss 34121 moves towards the rotating rod 3413. Before the boss 34121 contacts the rotating rod 3413, the first micro switch 36 disconnects and switches the signal sent to the controller. Subsequently, the boss 34121 contacts the rotating rod 3413 and pushes it to rotate, thereby separating the moving contact 3411 from the stationary contact 342. In other words, the first micro switch 36 disconnects before the moving contact 3411 separates from the stationary contact 342. The controller can then judge the first and second level signals sent by the first micro switch 36, thereby controlling the uninterruptible power supply 13 circuit to switch or adjust the output voltage in advance to ensure output voltage stability and improve voltage overshoot or undershoot phenomena, ensuring smoother parallel current sharing control of the power supply and distribution system 10.

[0073] Figure 12 is a partial enlarged view within the dashed box in Figure 7. As shown in Figure 12, when the first micro switch 36 is specifically configured, the first micro switch 36 includes a first fixed plate 361, a first moving contact 362, a first stationary contact 363, and a first spring 364. The first fixed plate 361 is fixed relative to the housing 31. The first moving contact 362 is slidably connected to the first fixed plate 361. The first stationary contact 363 and the first spring 364 are respectively located on the side of the first moving contact 362 away from the lever 34122. The first stationary contact 363 is fixed relative to the first fixed plate 361. One end of the first spring 364 is fixed relative to the first moving contact 362, and the other end of the first spring 364 is fixed relative to the first fixed plate 361. The lever 34122 is used to push the first moving contact 362, so that the first moving contact 362 slides on the first fixed plate 361 in a direction close to the first stationary contact 363 and contacts the first stationary contact 363, so that the first micro switch 36 is turned on. The lever 34122 is also used to separate from the first moving contact 362, allowing the first moving contact 362 to slide on the first fixed plate 361 in a direction away from the first stationary contact 363 and separate from it, thereby disengaging the first micro switch 36. The first micro switch 36 has a simple structure. As the lever 34122 rotates with the main shaft 3412, it pushes the first moving contact 362, causing it to contact the first stationary contact 363, thus enabling the first micro switch 36 to conduct and preventing accidental operation. Additionally, the first spring 364 can push the first moving contact 362 away from the first stationary contact 363 as the lever 34122 moves away from the first moving contact 362. Furthermore, when the lever 34122 pushes the first moving contact 362, the first spring 364 acts as a buffer to reduce the impact force of the first moving contact 362 on the first stationary contact 363.

[0074] In one embodiment, a first limiting rib 3611 is provided at one end of the first fixed plate 361 near the lever 34122. The first limiting rib 3611 is used to limit the position of the first moving contact 362 relative to the first fixed plate after the first micro switch 36 is opened, thereby limiting the maximum distance between the first moving contact 362 and the first stationary contact 363, and causing the lever 34122 to begin moving away from the first moving contact 362 when the main shaft 3412 begins to rotate in the first direction. In other words, when the first moving contact 362 slides toward the first limiting rib 3611 and contacts the first limiting rib 3611, the first moving contact 362 is disconnected from the first stationary contact 363. Furthermore, during the closing process of the circuit breaker 30, the lever 34122 approaches the first moving contact 362 and pushes the first moving contact 362 toward the first stationary contact 363, so that after closing, the first moving contact 362 and the first stationary contact 363 contact each other, turning on the first micro switch 36.

[0075] Figure 13 is a schematic diagram of the stroke and level of the first micro switch provided in this application embodiment. As shown in Figure 13, when the main shaft 3412 is at stroke 1, the circuit breaker 30 is in the closed state, and the moving contact 3411 and the stationary contact 342 are in contact. When the main shaft 3412 starts to rotate in the first direction, at stroke 2, the first moving contact 362 and the first stationary contact 363 separate. At this time, the level signal of the first micro switch 36 changes from the first level signal to the second level signal. The main shaft 3412 continues to rotate, from stroke 2 to stroke 3. The first moving contact 362 moves away from the first stationary contact 363. At this time, the level signal of the first micro switch 36 remains unchanged. At point A, the first moving contact 362 is at the maximum stroke, that is, the distance between the first moving contact 362 and the first stationary contact 363 is the largest. After this, the first moving contact 362 stops moving. At stroke 3, the boss 34121 contacts the rotating rod 3413. As the spindle 3412 continues to rotate from stroke 3, the boss 34121 begins to drive the rotating rod 3413 to rotate.

[0076] Figure 14 is another cross-sectional view of the circuit breaker in Figure 5 along the AA direction, and Figure 15 is a partial enlarged view within the dashed box in Figure 14. In Figure 14, the operating handle, operating mechanism, and arc-extinguishing chamber are omitted, and the circuit breaker is in the open state. As shown in Figures 14 and 15, the circuit breaker 30 may also include a second microswitch 37 located near the lever 34122. The lever 34122 is also used to turn the second microswitch 37 on or off. When the circuit breaker 30 is in the open state, the moving contact 3411 separates from the stationary contact 342, the boss 34121 contacts the rotating rod 3413, and the lever 34122 presses the second microswitch 37 to turn it on. When the circuit breaker 30 performs a closing operation, the circuit breaker 30 switches from the open state to the closed state. During the switching process of circuit breaker 30 from open to closed state, the operating mechanism 33 drives the main shaft 3412 to rotate in a second direction (opposite to the first direction), causing the lever 34122 to gradually move away from the second micro switch 37, and the rotating rod 3413 to rotate towards the stationary contact 342. Before the moving contact 3411 contacts the stationary contact 342, the second micro switch 37 opens and switches from sending a first-level signal to sending a second-level signal to the controller. During the rotation of the main shaft 3412, the lever 34122 gradually moves away from the second micro switch 37, while the moving contact 3411 moves towards the stationary contact 342. Before the moving contact 3411 contacts the stationary contact 342, the second micro switch 37 opens and switches the signal sent to the controller. Subsequently, the moving contact 3411 contacts the stationary contact 342, closing the circuit breaker 30. In other words, the second micro switch 37 is disconnected before the moving contact 3411 contacts the stationary contact 342. The controller can judge the first level signal and the second level signal sent by the second micro switch 37, thereby controlling the circuit switching of the uninterruptible power supply 13 in advance or adjusting the output voltage of the uninterruptible power supply 13 to ensure the stability of the output voltage and improve the overshoot or undershoot phenomenon, so as to ensure smoother parallel current sharing control of the power supply and distribution system 10.

[0077] In the above embodiment, in order to prepare for the next opening operation, when the circuit breaker 30 performs the closing operation (i.e., during the process of the circuit breaker 30 switching from the opening state to the closing state), after the moving contact 3411 contacts the stationary contact 342, the main shaft 3412 continues to rotate in the second direction, so that the boss 34121 separates from the rotating rod 3413 and is spaced at a set distance.

[0078] As shown in Figure 15, when the second micro switch 37 is specifically configured, the second micro switch 37 includes a second fixed plate 371, a second moving contact 372, a second stationary contact 373, and a second spring 374. The second fixed plate 371 is fixed relative to the housing 31. The second moving contact 372 is slidably connected to the second fixed plate 371, and the second stationary contact 373 and the second spring 374 are respectively located on the side of the second moving contact 372 away from the lever 34122. The second stationary contact 373 is fixed relative to the second fixed plate 371. One end of the second spring 374 is fixed relative to the second moving contact 372, and the other end of the second spring 374 is fixed relative to the second fixed plate 371. The lever 34122 is used to push the second moving contact 372, so that the second moving contact 372 slides on the second fixed plate 371 in a direction close to the second stationary contact 373 and contacts the second stationary contact 373, so that the second micro switch 37 is turned on. The lever 34122 is also used to separate from the second moving contact 372, allowing the second moving contact 372 to slide on the second fixed plate 371 away from the second stationary contact 373 and separate from it, thereby disengaging the second micro switch 37. This second micro switch 37 has a simple structure; the lever 34122 rotates with the main shaft 3412 and pushes the second moving contact 372, causing it to contact the second stationary contact 373, thus enabling the second micro switch 37 to conduct and preventing accidental operation. Additionally, the second spring 374 can push the second moving contact 372 away from the second stationary contact 373 as the lever 34122 moves away from the second moving contact 372. Furthermore, when the lever 34122 pushes the second moving contact 372, the second spring 374 acts as a buffer to reduce the impact force of the second moving contact 372 on the second stationary contact 373.

[0079] In one embodiment, a second limiting rib 3711 is provided at one end of the second fixed plate 371 near the lever 34122. The second limiting rib 3711 limits the position of the second moving contact 372 relative to the second fixed plate 371 when the second micro switch 37 is open, thereby limiting the maximum distance between the second moving contact 372 and the second stationary contact 373, and causing the lever 34122 to begin moving away from the second moving contact 372 when the main shaft 3412 begins to rotate in the second direction. In other words, when the second moving contact 372 slides toward and contacts the second limiting rib 3711, the second moving contact 372 is disconnected from the second stationary contact 373. Furthermore, during the opening process of the circuit breaker 30, the lever 34122 approaches the second moving contact 372 and pushes the second moving contact 372 toward the second stationary contact 373, so that after closing, the second moving contact 372 and the second stationary contact 373 come into contact, causing the second micro switch 37 to conduct.

[0080] Figure 16 is a schematic diagram of the stroke and level of the second micro switch provided in this embodiment. As shown in Figure 16, when the main shaft 3412 is at stroke 1, the circuit breaker 30 is in the open state, and the moving contact 3411 and the stationary contact 342 are separated. When the main shaft 3412 starts to rotate in the second direction, at stroke 2, the second moving contact 372 and the second stationary contact 373 separate. At this time, the level signal of the second micro switch 37 changes and switches the transmitted signal. The main shaft 3412 continues to rotate from stroke 2 to stroke 3. The second moving contact 372 moves away from the second stationary contact 373. At this time, the level signal of the second micro switch 37 remains unchanged. At point B, the second moving contact 372 is at the maximum stroke, that is, the distance between the second moving contact 372 and the second stationary contact 373 is the largest. After this, the second moving contact 372 stops moving.

[0081] In the circuit breaker 30 of this application, the moving contact assembly 341 may further include a third spring 3414. One end of the third spring 3414 is connected to the rotating rod 3413, and the other end is connected to the main shaft 3412. The third spring 3414 is used to keep the rotating rod 3413 in contact with the boss 34121, so that the rotating rod 3413 and the main shaft 3412 are relatively fixed. That is, when the rotating rod 3413 contacts the boss 34121, the third spring 3414 can fix the rotating rod 3413 and the main shaft 3412 relatively.

[0082] In the embodiments of this application, the circuit breaker 30 may be equipped with only the first micro switch 36, or only the second micro switch 37, or both the first micro switch 36 and the second micro switch 37 may be equipped.

[0083] As shown in Figures 7 and 14, in one embodiment, the first micro switch 36 and the second micro switch 37 are arranged opposite each other along the height direction h of the circuit breaker 30, and the first micro switch 36 and the second micro switch 37 are located between the moving contact assembly 341 and the operating mechanism 33, with a lever 34122 extending between the first micro switch 36 and the second micro switch 37. That is, during the process of the moving contact 3411 and the stationary contact 342 switching from a contact state to a disconnected state and from a disconnected state to a contact state, the lever 34122 moves between the first micro switch 36 and the second micro switch 37.

[0084] Specifically, the positions of the first micro switch 36 and the second micro switch 37 are configured, and a baffle 38 is provided inside the housing 31. The baffle 38 is located between the moving contact assembly 341 and the operating mechanism 33, and extends along the height direction h of the circuit breaker 30. The baffle 38 has an opening 381 through which the lever 34122 passes. The first micro switch 36 and the second micro switch 37 are located on the side of the baffle 38 closer to the operating mechanism 33, and are positioned opposite each other on both sides of the opening 381. Therefore, this embodiment utilizes the space between the operating mechanism 33 and the moving contact assembly 341 to configure the first micro switch 36 and the second micro switch 37, which helps to simplify the structure of the circuit breaker 30. In one embodiment, the first fixing plate 361 and the second fixing plate 371 can be fixedly connected to the housing 31. In another embodiment, the first fixing plate 361 and the second fixing plate 371 can be part of the housing 31 and together form the baffle 38.

[0085] Based on the same technical concept, this application also provides a control method for a power supply and distribution system. This control method can be used to control the power supply and distribution system 10 of any of the above embodiments. Specifically, the control method of this application includes:

[0086] Step 101: Receive the first signal and the second signal sent by the maintenance bypass switch. The first signal and the second signal are different.

[0087] Step 102: When the first signal is switched to the second signal, the uninterruptible power supply corresponding to the maintenance bypass switch is switched from the main circuit to the bypass circuit before the maintenance bypass switch is turned on.

[0088] In the power supply and distribution system 10 where the above control method is applied, the main circuit C1, bypass circuit C2, and maintenance bypass circuit C3 of the uninterruptible power supply 13 are connected to the first bus 11 and the second bus 12 through different switches. By controlling the on or off of each switch, the different circuits of the uninterruptible power supply 13 can be switched for operation. In a fault repair scenario, the uninterruptible power supply 13 needs to activate the maintenance bypass circuit C3 and switch the main circuit C1 to the bypass circuit C2. Before activating the maintenance bypass circuit C3, only the main circuit C1 is connected to the first bus 11 and the second bus 12, and the maintenance bypass switch K4 is in the off state. Activating the maintenance bypass circuit C3 is achieved by turning on the maintenance bypass switch K4. When the maintenance bypass switch K4 performs a closing operation (i.e., when the maintenance bypass switch K4 switches from the open state to the closed state), the signal sent by the maintenance bypass switch K4 is switched from the first signal to the second signal. When the first signal is switched to the second signal, the main circuit C1 can be switched to the bypass circuit C2 before the maintenance bypass switch K4 is turned on, thereby avoiding the voltage surge of the main grid power to the inverter 133 of the main circuit at the moment when the maintenance bypass circuit C3 is turned on.

[0089] The control method can also be applied to parallel operation mode. Specifically, when an uninterruptible power supply (UPS) 13 is added in parallel operation mode, the power supply and distribution system 10 includes m UPS 13 and n UPS 13, where m and n are positive integers greater than or equal to 1. The main circuits C1 of the aforementioned m UPS 13 are connected to the first bus 11 and the second bus 12, respectively, while the main circuits C1 of the aforementioned n UPS 13 are not connected to the first bus 11 and the second bus 12.

[0090] In one embodiment, when one of the main switch K1 and the output switch K3 is in the ON state and the other is in the OFF state, the control method specifically includes:

[0091] Step 201: Receive the third and fourth signals sent by the other party mentioned above;

[0092] Step 202: When the third signal is switched to the fourth signal, the output voltage of the inverters connected to the first bus and the second bus of other uninterruptible power supplies is reduced.

[0093] In another embodiment, when the main switch K1 and the output switch K3 are in the open state, the control method specifically includes:

[0094] Step 301: Receive the third and fourth signals sent by the main circuit switch and the output switch;

[0095] Step 302: When the third signal is switched to the fourth signal, the output voltage of the inverters connected to the first bus and the second bus is reduced.

[0096] In this way, after adding the uninterruptible power supply 13, the voltage output by the other uninterruptible power supplies 13 to the second bus 12 remains stable, preventing the voltage supplied to the load from being too high.

[0097] When reducing the number of uninterruptible power supplies 13 in parallel operation mode, the power supply and distribution system 10 includes N uninterruptible power supplies 13, where N is a positive integer greater than 1. The main circuit C1 of the aforementioned N uninterruptible power supplies 13 has been connected to the first bus 11 and the second bus 12, respectively.

[0098] In one embodiment, during the disconnection of the main circuit C1 of M of the aforementioned N uninterruptible power supplies 13 from the first bus 11 and the second bus 12, one of the main circuit switch K1 and the output switch K3 of the aforementioned M uninterruptible power supplies 13 is disconnected first. The control method specifically includes:

[0099] Step 401: Receive the third and fourth signals sent by one of the above;

[0100] Step 402: When the fourth signal is switched to the third signal, the output voltage of the inverter of the other uninterruptible power supply among the above N uninterruptible power supplies is increased.

[0101] In another embodiment, during the disconnection of the main circuit C1 of M of the aforementioned N uninterruptible power supplies 13 from the first bus 11 and the second bus 12, the main circuit switch K1 and the output switch K3 of the aforementioned M uninterruptible power supplies 13 are simultaneously disconnected. The control method specifically includes:

[0102] Step 501: Receive the third and fourth signals sent by the main circuit switch and the output switch;

[0103] Step 502: When the fourth signal is switched to the third signal, the output voltage of the inverter of the other uninterruptible power supply among the above N uninterruptible power supplies is increased.

[0104] In this way, after reducing the number of uninterruptible power supplies 13, the voltage output by the remaining uninterruptible power supplies 13 to the second bus 12 remains stable, preventing the voltage supplied to the load from being too low.

[0105] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power distribution system, characterized by, The UPS comprises a first bus, a second bus, a controller and an uninterrupted power supply, wherein: The first bus is electrically connected with a power grid, and the second bus is electrically connected with a load; The uninterrupted power supply comprises a main circuit, a bypass circuit and an output switch, the main circuit and the bypass circuit are respectively connected with the first bus, the main circuit and the bypass circuit are connected in parallel and then connected in series with the output switch, and the output switch is connected with the second bus; the main circuit comprises a main switch and an inverter connected in series, the main switch is connected with the first bus, and the inverter is connected with the output switch; the bypass circuit comprises a bypass switch, one end of the bypass switch is connected with the first bus, and the other end of the bypass switch is connected with the output switch; each uninterrupted power supply further comprises a maintenance bypass circuit, the maintenance bypass circuit comprises a maintenance bypass switch, one end of the maintenance bypass switch is connected with the first bus, and the other end of the maintenance bypass switch is connected with the second bus; The main switch and the output switch are used for turning on and turning off the main circuit, the bypass switch and the output switch are used for turning on and turning off the bypass circuit, and the maintenance bypass switch is used for turning on and turning off the maintenance bypass circuit; the output switch, the main switch, the bypass switch and the maintenance bypass switch are respectively electrically connected with the controller; The controller is used for controlling the main circuit and the bypass circuit to access to the first bus and the second bus and form a loop only by controlling the turning on or turning off of the output switch, the main switch, the bypass switch and the maintenance bypass switch, or controlling the bypass circuit and the maintenance bypass circuit to access to the first bus and the second bus in parallel and form a loop; In the case that the main circuit accesses to the first bus and the second bus and the maintenance bypass switch is turned off, in the process that the maintenance bypass switch is switched from the off state to the on state, the maintenance bypass switch is used for switching from sending a first signal to the controller to sending a second signal to the controller before being turned on, the first signal is different from the second signal; the controller is used for controlling the uninterrupted power supply to switch from the main circuit to the bypass circuit before the maintenance bypass switch is turned on when the first signal is switched to the second signal.

2. The power distribution system of claim 1, wherein, The switching of the uninterrupted power supply from the main circuit to the bypass circuit specifically comprises: The controller controls the inverter to switch to a standby state before the maintenance bypass switch is turned on, and controls the bypass switch to be turned on before the maintenance bypass switch is turned on.

3. The power distribution system of claim 2, wherein, The bypass switch comprises a circuit breaker and a switching transistor; In the case that at least one of the circuit breaker and the switching transistor is in the off state when the bypass circuit is turned off, wherein: In the case that only one of the circuit breaker and the switching transistor is in the off state, in the process that the bypass switch is switched from the off state to the on state, the controller controls the circuit breaker or the switching transistor to be turned on before the maintenance bypass switch is turned on; or In a case where the circuit breaker and the switching transistor are both in an off state, during a process in which the bypass switch is switched from an off state to an on state, the controller controls the circuit breaker and the switching transistor to be turned on before the maintenance bypass switch is turned on, respectively.

4. The power distribution system of any one of claims 1 to 3, wherein, The power supply system comprises m uninterrupted power supplies and n uninterrupted power supplies, wherein m and n are positive integers greater than or equal to 1; the main circuit of the m uninterrupted power supplies is connected to the first bus and the second bus, respectively, and the main circuit of the n uninterrupted power supplies is not connected to the first bus and the second bus; In at least one of the n uninterrupted power supplies, one of the main switch and the output switch is in an on state, and the other is in an off state; during a process in which the main circuit of the at least one uninterrupted power supply is connected to the first bus and the second bus, during a process in which the main switch or the output switch is switched from an off state to an on state, the main switch or the output switch is switched from sending a third signal to the controller to sending a fourth signal to the controller before being turned on, the third signal being different from the fourth signal; The controller is configured to control the output voltage of the inverter of the m uninterrupted power supplies to decrease when the third signal is switched to the fourth signal, so that after the main circuit of the at least one uninterrupted power supply is connected to the first bus and the second bus, the voltage output by the m uninterrupted power supplies to the second bus remains stable; or In at least one of the n uninterrupted power supplies, the main switch and the output switch are in an off state; during a process in which the main circuit of the at least one uninterrupted power supply is connected to the first bus and the second bus, during a process in which the main switch and the output switch are switched from an off state to an on state, at least one of the main switch and the output switch is switched from sending a third signal to the controller to sending a fourth signal to the controller before being turned on, the third signal being different from the fourth signal; The controller is configured to control the output voltage of the inverter of the m uninterrupted power supplies to decrease when the third signal is switched to the fourth signal, so that after the main circuit of the at least one uninterrupted power supply is connected to the first bus and the second bus, the voltage output by the m uninterrupted power supplies to the second bus remains stable.

5. The power distribution system of claim 4, wherein, The switch that sends the third signal and the fourth signal to the controller is a first circuit breaker, and the first circuit breaker comprises a housing, an operating handle, a moving contact assembly, a stationary contact, and a first micro switch, wherein: The operation handle, the movable contact assembly, the static contact and the first micro switch are located in the shell, and the operation handle extends out of the shell; the movable contact assembly comprises a main shaft and a rotating rod, and the main shaft and the rotating rod are rotatably connected with the shell respectively; the operation handle is in transmission connection with the main shaft; one end of the rotating rod is arranged close to the main shaft, and the other end extends away from the operation handle and is provided with a movable contact for contacting or separating from the static contact; The operation handle is used to drive the main shaft to rotate, and the main shaft is provided with a boss for driving the rotating rod to rotate so as to separate the movable contact from the static contact; The main shaft is further provided with a push rod for turning on or off the first micro switch; When the first circuit breaker is in the open state, the movable contact is separated from the static contact, the boss is in contact with the rotating rod, and the push rod presses the first micro switch, so that the first micro switch is turned on and the third signal is sent to the controller; during the process of switching the first circuit breaker from the open state to the closed state, the operation handle drives the main shaft to rotate, so that the push rod moves away from the first micro switch, and the rotating rod rotates towards the static contact, so that the first micro switch is turned off and the fourth signal is sent before the movable contact contacts the static contact; when the first circuit breaker is in the closed state, the movable contact is in contact with the static contact, and the first micro switch is used to send the fourth signal to the controller.

6. The power distribution system of any one of claims 1 to 3, wherein, The power supply and distribution system comprises N uninterrupted power supplies, N is a positive integer greater than 1; the main circuit of the N uninterrupted power supplies has been connected to the first bus and the second bus respectively; During the process of disconnecting the main circuit of M uninterrupted power supplies from the first bus and the second bus, one of the main switch and the output switch of the M uninterrupted power supplies is first disconnected, and the one is used to switch from sending the fourth signal to the controller to sending the third signal to the controller before being disconnected, the third signal is different from the fourth signal, M is a positive integer greater than or equal to 1, and M is less than N; The controller is used to control the output voltage of the inverter of the remaining uninterrupted power supplies in the N uninterrupted power supplies to increase when the fourth signal is switched to the third signal, so that the voltage output by the remaining uninterrupted power supplies to the second bus remains stable after the main circuit of the M uninterrupted power supplies is disconnected from the first bus and the second bus; or In the process that the main circuit of M uninterrupted power supplies among the N uninterrupted power supplies is disconnected from the first busbar and the second busbar, the main switch and the output switch of the M uninterrupted power supplies are simultaneously disconnected, and the main switch and the output switch are switched from sending the fourth signal to the controller to sending the third signal to the controller before being disconnected, the third signal is different from the fourth signal, M is a positive integer greater than or equal to 1, and M is less than N; The controller is used to control the output voltage of the inverter of the remaining uninterrupted power supply among the N uninterrupted power supplies to increase when the fourth signal is switched to the third signal, so that the voltage output by the remaining uninterrupted power supply to the second busbar remains stable after the main circuit of the M uninterrupted power supplies is disconnected from the first busbar and the second busbar.

7. The power distribution system of claim 6, wherein, The switch for sending the third signal and the fourth signal to the controller is a second circuit breaker, and the second circuit breaker comprises a housing, an operating handle, a moving contact assembly, a stationary contact and a second micro switch, wherein: The operating handle, the moving contact assembly, the stationary contact and the second micro switch are located in the housing, and the operating handle extends out of the housing; the moving contact assembly comprises a main shaft and a rotating rod, and the main shaft and the rotating rod are respectively rotationally connected with the housing; the operating handle is in transmission connection with the main shaft; one end of the rotating rod is arranged close to the main shaft, and the other end thereof extends away from the operating handle and is provided with a moving contact, and the moving contact is used to contact or separate from the stationary contact; The operating handle is used to drive the main shaft to rotate, and the main shaft is provided with a boss, and the boss is used to drive the rotating rod to rotate, so that the moving contact separates from the stationary contact; The main shaft is further provided with a dial rod, and the dial rod is used to turn on or turn off the second micro switch; When the second circuit breaker is in the closed state, the moving contact contacts the stationary contact, the boss is spaced apart from the rotating rod by a certain distance, and the dial rod presses the second micro switch, so that the second micro switch is turned on and is used to send the fourth signal to the controller; in the process that the second circuit breaker is switched from the closed state to the open state, the operating handle drives the main shaft to rotate, so that the dial rod moves away from the second micro switch, and the boss moves towards the rotating rod, so that the second micro switch is turned off and sends the third signal before the boss contacts the rotating rod; when the second circuit breaker is in the open state, the moving contact separates from the stationary contact, and the second micro switch is used to send the third signal to the controller.

8. The power supply and distribution system as described in any one of claims 1 to 7, characterized in that, The maintenance bypass switch is a third circuit breaker, and the third circuit breaker comprises a housing, an operating handle, a moving contact assembly, a stationary contact and a third micro switch, wherein: The operating handle, the moving contact assembly, the static contact and the third micro switch are located in the shell, and the operating handle extends out of the shell; the moving contact assembly comprises a main shaft and a rotating rod, and the main shaft and the rotating rod are rotatably connected with the shell respectively; the operating handle is in transmission connection with the main shaft; one end of the rotating rod is arranged close to the main shaft, and the other end extends away from the operating handle and is provided with a moving contact, which is used for contacting or separating from the static contact; The operating handle is used to drive the main shaft to rotate, and the main shaft is provided with a boss, which is used to drive the rotating rod to rotate, so that the moving contact separates from the static contact; The main shaft is further provided with a push rod, which is used to turn on or turn off the third micro switch; When the third circuit breaker is in the open state, the moving contact separates from the static contact, the boss contacts the rotating rod, and the push rod presses the third micro switch, so that the third micro switch is turned on and sends the first signal to the controller; during the process that the third circuit breaker is switched from the open state to the closed state, the operating handle drives the main shaft to rotate, so that the push rod moves away from the third micro switch, and the rotating rod rotates towards the static contact, so that the third micro switch is turned off and sends the second signal before the moving contact contacts the static contact; when the third circuit breaker is in the closed state, the moving contact contacts the static contact, and the third micro switch is used to send the first signal to the controller.

9. A power distribution system, characterized by The method comprises the following steps: The first bus and the second bus are electrically connected with the power grid and the load respectively; Each uninterruptible power supply comprises a main circuit, a bypass circuit and an output switch, the main circuit and the bypass circuit are connected with the first bus respectively, the main circuit and the bypass circuit are connected in parallel and then connected in series with the output switch, and the output switch is connected with the second bus; the main circuit comprises a main circuit switch and an inverter connected in series, the main circuit switch is connected with the first bus, and the inverter is connected with the output switch; the bypass circuit comprises a bypass switch, one end of the bypass switch is connected with the first bus, and the other end is connected with the output switch; The main circuit switch and the output switch are used to turn on and turn off the main circuit, and the bypass switch and the output switch are used to turn on and turn off the bypass circuit; the output switch, the main circuit switch and the bypass switch are electrically connected with the controller respectively; The controller is used to control only one of the main circuit and the bypass circuit to access to the first bus and the second bus and form a loop by controlling the turn-on or turn-off of the output switch, the main circuit switch and the bypass switch. In the process of switching the output switch from the off state to the on state, the output switch is configured to switch from sending the third signal to the controller to sending the fourth signal to the controller before being on, the third signal being different from the fourth signal; in the process of switching the output switch from the on state to the off state, the output switch is configured to switch from sending the fourth signal to the controller to sending the third signal to the controller before being off; the controller is configured to control the inverters of the plurality of uninterruptible power supplies to adjust the output voltage before the output switch is on or off when the third signal is switched to the fourth signal or when the fourth signal is switched to the third signal, so as to keep the voltage output by the plurality of uninterruptible power supplies to the second bus stable.

10. The power distribution system of claim 9, wherein, The power supply and distribution system comprises m uninterruptible power supplies and n uninterruptible power supplies, wherein m and n are positive integers greater than or equal to 1; the main circuit of the m uninterruptible power supplies has been connected to the first bus and the second bus respectively, and the main circuit of the n uninterruptible power supplies has not been connected to the first bus and the second bus; In at least one of the n uninterruptible power supplies, the main switch is in the on state and the output switch is in the off state; in the process of connecting the main circuit of the at least one uninterruptible power supply to the first bus and the second bus, in the process of switching the output switch from the off state to the on state, the output switch is configured to switch from sending the third signal to the controller to sending the fourth signal to the controller before being on; The controller is configured to control the output voltage of the inverters of the m uninterruptible power supplies to decrease when the third signal is switched to the fourth signal, so that the voltage output by the m uninterruptible power supplies to the second bus remains stable after the main circuit of the at least one uninterruptible power supply is connected to the first bus and the second bus; or In at least one of the n uninterruptible power supplies, the main switch and the output switch are in the off state; in the process of connecting the main circuit of the at least one uninterruptible power supply to the first bus and the second bus, in the process of switching the main switch and the output switch from the off state to the on state at the same time, the output switch is configured to switch from sending the third signal to the controller to sending the fourth signal to the controller before being on; The controller is configured to control the output voltage of the inverters of the m uninterruptible power supplies to decrease when the third signal is switched to the fourth signal, so that the voltage output by the m uninterruptible power supplies to the second bus remains stable after the main circuit of the at least one uninterruptible power supply is connected to the first bus and the second bus.

11. The power distribution system of claim 9, wherein, The power supply and distribution system comprises N uninterruptible power supplies, N being a positive integer greater than 1; the main circuit of the N uninterruptible power supplies has been connected to the first bus and the second bus respectively; In a process that the main circuit of the M uninterrupted power supplies among the N uninterrupted power supplies is disconnected from the first busbar and the second busbar, the output switch of the M uninterrupted power supplies is first disconnected, and the output switch is used to switch from sending the fourth signal to the controller to sending the third signal to the controller before being disconnected, M is a positive integer greater than or equal to 1, and M is less than N; The controller is used to control the output voltage of the inverter of the remaining uninterrupted power supply among the N uninterrupted power supplies to increase when the fourth signal is switched to the third signal, so that the voltage output by the remaining uninterrupted power supply to the second busbar remains stable after the main circuit of the M uninterrupted power supplies is disconnected from the first busbar and the second busbar; or In a process that the main circuit of the M uninterrupted power supplies among the N uninterrupted power supplies is disconnected from the first busbar and the second busbar, the main switch and the output switch of the M uninterrupted power supplies are simultaneously disconnected, and the output switch is used to switch from sending the fourth signal to the controller to sending the third signal to the controller before being disconnected, M is a positive integer greater than or equal to 1, and M is less than N; The controller is used to control the output voltage of the inverter of the remaining uninterrupted power supply among the N uninterrupted power supplies to increase when the fourth signal is switched to the third signal, so that the voltage output by the remaining uninterrupted power supply to the second busbar remains stable after the main circuit of the M uninterrupted power supplies is disconnected from the first busbar and the second busbar.

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