Redundant standby system of UPS (Uninterrupted Power Supply)

Abstract

The utility model discloses a redundant standby system of a UPS (Uninterrupted Power Supply). The system comprises a standby UPS power supply side low-voltage power distribution cabinet, a standby UPS and a battery pack thereof, a standby UPS load side low-voltage power distribution cabinet, a main UPS power supply side low-voltage power distribution cabinet, a main UPS and a battery pack thereof, a main UPS load side low-voltage power distribution cabinet, a 1A # transformer low-voltage side power distribution cabinet horizontal bus, a 1B # transformer low-voltage side power distribution cabinet horizontal bus and a bypass power supply bus. A main UPS power supply side power distribution cabinet internal synchronization detection device; and a main UPS load side power distribution cabinet internal synchronization detection device. An auxiliary control system can be built, misoperation accidents can be avoided to a great extent, and the intelligent degree of operation and maintenance is improved. According to the invention, when a plurality of UPSs exist, a single standby UPS can provide standby for the plurality of UPSs.

Description

Technical Field

[0001] This application relates to the field of UPS power supplies, and more specifically to a redundant backup system for a UPS power supply. Background Art

[0002] Chip factories have extremely high requirements for the continuity and reliability of power supply to production lines. Power supply interruptions and abnormal power quality of key equipment are important reasons for downtime accidents. Therefore, diesel generator sets and UPSs are widely used in chip factories to prevent power supply interruptions and improve power quality. Considering the requirements of chip factories for power supply continuity and reliability, double-conversion UPS systems are adopted and redundant backup is required.

[0003] There are usually two schemes for the redundant design of UPS systems: parallel redundant UPS systems and series redundant UPS systems.

[0004] The series redundant UPS system consists of two or more single-unit UPS systems. One single-unit UPS serves as a standby, and its load side is connected to the static bypass of the main UPS. When a fault occurs in the rectifier-inverter circuit of the main UPS, the main UPS will automatically switch to the static bypass, and the standby UPS will supply power to the load. The series redundant UPS system does not have a common load-side busbar. When a fault occurs in the load-side busbar of a single-unit UPS, the affected range is limited to the equipment powered by this unit only, and the reliability of the power supply system is high; the series redundant UPS system is easy to retrofit later, and UPSs of different models and capacities can form this system; the main UPS and the standby UPS can be maintained separately, ensuring that the load is still protected by the UPS during maintenance. The series redundant UPS system can also form an "N + 1 series redundant system" by setting a common bypass power busbar on the load side of the standby UPS and supplying power to the bypass of the main UPS through this busbar. The N + 1 series redundant system can achieve the purpose of expanding the output capacity by increasing the number of main UPSs. Since the power-side and load-side distribution busbars of the main UPS only consider the capacity of a single-unit UPS, under the current mainstream UPS capacity in the market (single-unit UPS capacity ≤ 1250 kVA), there is no need to consider the main busbar capacity limit of the low-voltage distribution system. Since the standby UPS generally serves as a standby for only one main UPS, when one main UPS switches to the bypass, it is usually necessary to disconnect the connection between the bypass of other main UPSs and the standby UPS. Different from the parallel redundant UPS system, when the mains power fails, the battery life is the cumulative time of all the battery packs of the main UPSs.

[0005] When the load capacity requirement is large, for example, the UPS capacity required by a 12-inch chip factory is more than 50 MVA, the number of UPS main units required will be large. At the same time, the number of UPS power-side distribution transformers required is also large. In order to enable a single standby UPS to provide standby for more main UPSs, a new technical solution needs to be constructed. Summary of the Invention

[0006] Therefore, to solve the above problems, the present utility model provides a redundant standby system for a UPS power supply herein to solve the problem that when there are multiple UPSs, a single standby UPS can provide standby for multiple UPSs.

[0007] The present utility model is implemented as follows. A redundant standby system for a UPS power supply is constructed, which is characterized in that: the system includes a low-voltage distribution cabinet (1) on the power supply side of the standby UPS, the standby UPS and its battery pack (2), a low-voltage distribution cabinet (3) on the load side of the standby UPS, a low-voltage distribution cabinet (4) on the power supply side of the main UPS, the main UPS and its battery pack (5), a low-voltage distribution cabinet (6) on the load side of the main UPS, the horizontal busbar (7) on the low-voltage side of the 1A# transformer low-voltage distribution cabinet, the horizontal busbar (8) on the low-voltage side of the 1B# transformer low-voltage distribution cabinet, the horizontal busbar (9) on the low-voltage side of the 2A# transformer low-voltage distribution cabinet, the horizontal busbar (10) on the low-voltage side of the 2B# transformer low-voltage distribution cabinet, the bypass power busbar (11), the circuit breaker A (14) in the 1A# transformer low-voltage distribution cabinet, the circuit breaker A (18) in the 2A# transformer low-voltage distribution cabinet, the circuit breaker A (19) in the 1B# transformer low-voltage distribution cabinet, the external maintenance bypass busbar (25) of the main UPS, and the external maintenance bypass busbar (26) of the standby UPS;

[0008] The low-voltage distribution cabinet (1) on the power supply side of the standby UPS includes a circuit breaker A (15) in the low-voltage distribution cabinet on the power supply side of the standby UPS;

[0009] The standby UPS and its battery pack (2) include a rectification and inversion circuit (27) of the standby UPS, a static bypass (28) of the standby UPS, and the battery pack of the standby UPS;

[0010] The low-voltage distribution cabinet (3) on the load side of the standby UPS includes a circuit breaker A (16) on the output side of the UPS in the low-voltage distribution cabinet on the load side of the standby UPS and a circuit breaker B (17) on the maintenance bypass side in the low-voltage distribution cabinet on the load side of the standby UPS;

[0011] The low-voltage distribution cabinet (4) on the power supply side of the main UPS includes a synchronization detection device (12) in the power supply side distribution cabinet of the main UPS, a rectification and inversion side circuit breaker C (20) in the low-voltage distribution cabinet on the power supply side of the main UPS, a static bypass side circuit breaker A (21) in the low-voltage distribution cabinet on the power supply side of the main UPS, and a static bypass side circuit breaker B (24) in the low-voltage distribution cabinet on the power supply side of the main UPS;

[0012] The main UPS and its battery pack (5) include the rectifier-inverter circuit (29) of the main UPS, the static bypass (30) of the main UPS, and the battery pack of the main UPS;

[0013] The low-voltage power distribution cabinet (6) on the load side of the main UPS includes the synchronization detection device (13) inside the power distribution cabinet on the load side of the main UPS, the circuit breaker A (22) on the output side of the UPS inside the low-voltage power distribution cabinet on the load side of the main UPS, and the circuit breaker B (23) on the maintenance bypass side inside the low-voltage power distribution cabinet on the load side of the main UPS;

[0014] The UPS adopts the double-conversion mode, including a rectifier-inverter circuit and a static bypass. When the rectifier-inverter circuit fails, it can automatically switch to the static bypass through the static switch without causing power loss to the load; also, when the rectifier-inverter circuit fault is eliminated, it can automatically switch from the static bypass to the rectifier-inverter circuit through the static switch without causing power loss to the load;

[0015] The synchronization detection device detects the voltage difference, frequency difference, and phase difference between the power supplies at two sampling points, and outputs a signal indicating that the synchronization detection is passed when the voltage difference, frequency difference, and phase difference meet the preset conditions;

[0016] The horizontal busbars (7) of the low-voltage side of the 1A# transformer power distribution cabinet, the horizontal busbars (8) of the low-voltage side of the 1B# transformer power distribution cabinet, the horizontal busbars (9) of the low-voltage side of the 2A# transformer power distribution cabinet, and the horizontal busbars (10) of the low-voltage side of the 2B# transformer power distribution cabinet are located on the power supply side of the UPS; the low-voltage power distribution cabinet (1) on the power supply side of the standby UPS is located on the power supply side of the standby UPS and its battery pack (2); the low-voltage power distribution cabinet (3) on the load side of the standby UPS, the low-voltage power distribution cabinet (4) on the power supply side of the main UPS, and the bypass power busbar (11) are located on the load side of the standby UPS and its battery pack (2); the low-voltage power distribution cabinet (4) on the power supply side of the main UPS is located on the power supply side of the main UPS and its battery pack (5); the low-voltage power distribution cabinet (6) on the load side of the main UPS is located on the load side of the main UPS and its battery pack (5); the bypass power busbar (11) is located on the load side of the low-voltage power distribution cabinet (3) on the load side of the standby UPS; the bypass power busbar (11) is located on the power supply side of the low-voltage power distribution cabinet (4) on the power supply side of the main UPS;

[0017] 1A# The horizontal busbar (7) of the low-voltage distribution cabinet on the low-voltage side of the transformer is connected to the low-voltage distribution cabinet (1) on the side of the standby UPS power supply by a cable; the low-voltage distribution cabinet (1) on the side of the standby UPS power supply is connected to the standby UPS and its battery pack (2) by a cable; the standby UPS and its battery pack (2) are connected to the low-voltage distribution cabinet (3) on the load side of the standby UPS by a cable; the low-voltage distribution cabinet (3) on the load side of the standby UPS is connected to the bypass power busbar (11) by a cable; the bypass power busbar (11) is connected to the low-voltage distribution cabinet (4) on the side of the main UPS power supply by a cable; the low-voltage distribution cabinet (4) on the side of the main UPS power supply is connected to the main UPS and its battery pack (5) by a cable; the main UPS and its battery pack (5) are connected to the low-voltage distribution cabinet (6) on the load side of the main UPS by a cable; 2A# The horizontal busbar (9) of the low-voltage distribution cabinet on the low-voltage side of the transformer is connected to the low-voltage distribution cabinet (4) on the side of the main UPS power supply by a cable; 2B# The horizontal busbar (10) of the low-voltage distribution cabinet on the low-voltage side of the transformer is connected to the low-voltage distribution cabinet (4) on the side of the main UPS power supply by a cable;

[0018] Each circuit breaker is fixed in the low-voltage distribution cabinet and is connected to the copper busbar in the distribution cabinet by a copper busbar;

[0019] The synchronization detection device (12) in the low-voltage distribution cabinet on the side of the main UPS power supply and the synchronization detection device (13) in the low-voltage distribution cabinet on the load side of the main UPS are fixed in the low-voltage distribution cabinet and are connected to the sampling points by copper-core insulated wires;

[0020] The horizontal busbar (7) of the low-voltage distribution cabinet on the low-voltage side of the 1A# transformer, the horizontal busbar (8) of the low-voltage distribution cabinet on the low-voltage side of the 1B# transformer, the horizontal busbar (9) of the low-voltage distribution cabinet on the low-voltage side of the 2A# transformer, and the horizontal busbar (10) of the low-voltage distribution cabinet on the low-voltage side of the 2B# transformer are all in a live state.

[0021] According to the redundant standby system of a UPS power supply described in the present application: it can be manually operated, or an auxiliary automatic control system can be set up to improve the automation level to prevent misoperation and improve the operation and maintenance efficiency.

[0022] According to the redundant standby system of a UPS power supply described in the present application: the bypass incoming line sides of the main UPS respectively draw power from the low-voltage distribution cabinet on the low-voltage side of the transformer and the load-side distribution busbar of the standby UPS.

[0023] A redundant standby system for a UPS power supply according to the present application: On the power supply sides of the static bypass and the maintenance bypass of the main UPS, there are two power supplies, namely the power supply led from the transformer and the power supply led from the standby UPS, and a synchronization detection device is provided between the power supply led from the transformer and the power supply led from the standby UPS; so that when the synchronization detection passes, the power supply led from the standby UPS can be put into operation first and then the power supply led from the transformer can be cut off, or the power supply led from the transformer can be put into operation first and then the power supply led from the standby UPS can be cut off, so that the static bypass and the maintenance bypass of the UPS are not powered off when the two power supplies are switched.

[0024] A redundant standby system for a UPS power supply according to the present application: The main circuit power supply and the bypass power supply of the standby UPS adopt the same power line.

[0025] A redundant standby system for a UPS power supply according to the present application: In the low-voltage power distribution cabinet on the load side of the main UPS, there are two power supplies, namely the power supply led from the main UPS and the power supply led from the external maintenance bypass bus of the main UPS, and a synchronization detection device is provided between the power supply led from the main UPS and the power supply led from the external maintenance bypass bus of the main UPS; so that when the synchronization detection passes, the power supply led from the main UPS can be put into operation first and then the power supply led from the external maintenance bypass bus of the main UPS can be cut off, or the power supply led from the external maintenance bypass bus of the main UPS can be put into operation first and then the power supply led from the main UPS can be cut off, so that the load side of the low-voltage power distribution cabinet on the load side of the main UPS is not powered off when the two power supplies are switched.

[0026] A redundant standby system for a UPS power supply according to the present application: Under normal circumstances, the main UPS supplies power to the load through the rectifier-inverter circuit. When its rectifier-inverter circuit fails, the UPS will automatically switch to the static bypass through the static switch and be powered by the transformer to the load. When the synchronization condition is reached between the power supply led from the transformer and the power supply led from the standby UPS, it can be switched to the standby UPS to supply power to the load, and the load is not powered off during the switching process.

[0027] A redundant standby system for a UPS power supply according to the present application: When the main UPS can be put into use, the static bypass of the main UPS is put into operation first, and then it will be automatically switched to the rectifier-inverter circuit to supply power to the load through the static bypass, and then the connection with the external maintenance bypass bus of the main UPS will be disconnected, and the load is not powered off during the switching process.

[0028] A redundant standby system for a UPS power supply according to the present application: When both the main UPS and the standby UPS need to be taken out of operation, the power supply is directly supplied from the low-voltage side of the transformer to the load, and the load is not powered off during the switching process.

[0029] A redundant backup system for a UPS power supply according to the present application: When the main UPS exits operation and the standby UPS can resume operation, the power supply from the low-voltage side of the transformer directly to the load is switched to the power supply from the standby UPS to the load, and the load is continuously powered during the switching process.

[0030] A redundant backup system for a UPS power supply according to the present application: When the main UPS supplies power to the load, the rectifier-inverter circuit of the main UPS is put into operation. When the standby UPS supplies power to the load, the rectifier-inverter circuit of the standby UPS is put into operation. In both operating conditions, the load is powered by the rectifier-inverter circuit.

[0031] A redundant backup method for a UPS power supply, the implementation process is as follows:

[0032] Method 1: Taking the switching between the standby UPS0 and the primary UPSn2 as an example, the process of switching from the primary UPS power supply to the load to the standby UPS power supply to the load is as follows: The initial state is that the UPS0 is in a normal state and in a hot standby state, and the circuit breaker A (16) on the output side of the UPS in the low-voltage power distribution cabinet on the load side of the standby UPS is in the closed state, and the rectifier-inverter circuit (29) of the primary UPS is in the working state and outputs power, and the current at the position of the circuit breaker A (22) on the output side of the UPS in the low-voltage power distribution cabinet on the load side of the primary UPS is greater than zero. At this time, the power supply is supplied to the load through the horizontal busbar (9) of the low-voltage power distribution cabinet on the secondary side of the 2A# transformer, the circuit breaker A (18) in the low-voltage power distribution cabinet on the secondary side of the 2A# transformer, the rectifier-inverter side circuit breaker C (20) in the low-voltage power distribution cabinet on the power supply side of the primary UPS, the rectifier-inverter circuit (29) of the primary UPS, and the circuit breaker A (22) on the output side of the UPS in the low-voltage power distribution cabinet on the load side of the primary UPS; When UPSn2 is planned for maintenance or fails and needs to be switched, and after no current is detected at the position of the circuit breaker A (19) in the low-voltage power distribution cabinet on the secondary side of the 1B# transformer, the circuit breaker A (19) in the low-voltage power distribution cabinet on the secondary side of the 1B# transformer performs the opening action; The static bypass side circuit breaker B (24) in the low-voltage power distribution cabinet on the power supply side of the primary UPS is closed; After confirming that the bypass power supply voltage and frequency of UPSn2 are normal, the rectifier-inverter circuit (29) of the primary UPS performs the shutdown action, and UPSn2 automatically switches from the rectifier-inverter circuit (29) of the primary UPS to the static bypass (30) of the primary UPS for power supply; After confirming that there is three-phase current at the position of the static bypass side circuit breaker B (24) in the low-voltage power distribution cabinet on the power supply side of the primary UPS and the synchronization detection device (13) in the low-voltage power distribution cabinet on the load side of the primary UPS passes the synchronization detection, the maintenance bypass side circuit breaker B (23) in the low-voltage power distribution cabinet on the load side of the primary UPS performs the closing action; After confirming that the current of the maintenance bypass side circuit breaker B (23) in the low-voltage power distribution cabinet on the load side of the primary UPS is greater than zero, the circuit breaker A (22) on the output side of the UPS in the low-voltage power distribution cabinet on the load side of the primary UPS performs the opening action; At this time, the load originally powered by UPSn2 is powered by UPS0, and the process of switching from the primary UPS power supply to the load to the standby UPS power supply to the load is completed; At this time, the power supply is supplied to the load through the horizontal busbar (7) of the low-voltage power distribution cabinet on the secondary side of the 1A# transformer, the circuit breaker A (14) in the low-voltage power distribution cabinet on the secondary side of the 1A# transformer, the circuit breaker A (15) in the low-voltage power distribution cabinet on the power supply side of the standby UPS, the rectifier-inverter circuit (27) of the standby UPS, the circuit breaker A (16) on the output side of the UPS in the low-voltage power distribution cabinet on the load side of the standby UPS, the bypass power supply busbar (11), the static bypass side circuit breaker B (24) in the low-voltage power distribution cabinet on the power supply side of the primary UPS, the external maintenance bypass busbar (25) of the primary UPS, and the maintenance bypass side circuit breaker B (23) in the low-voltage power distribution cabinet on the load side of the primary UPS;

[0033] Method 2: Taking the switching between the standby UPS0 and the main UPSn2 as an example, the process of switching from the standby UPS power supply to the load to the main UPS power supply to the load is as follows: The initial state is that the rectifier-inverter circuit (27) of the standby UPS is in the working state and outputs power, and the load is powered through the external maintenance bypass bus (25) of the main UPS. The maintenance bypass side circuit breaker B (23) in the low-voltage distribution cabinet on the load side of the main UPS is in the closed state, the static bypass side circuit breaker B (24) in the low-voltage distribution cabinet on the power supply side of the main UPS is in the closed state, the UPS output side circuit breaker A (16) in the low-voltage distribution cabinet on the load side of the standby UPS is in the closed state, the UPS output side circuit breaker A (22) in the low-voltage distribution cabinet on the load side of the main UPS is in the open state, and the rectifier-inverter circuit (29) of the main UPS is in the off state. At this time, the power supply passes through the horizontal bus (7) of the low-voltage distribution cabinet on the secondary side of the 1A# transformer, the circuit breaker A (14) in the low-voltage distribution cabinet on the secondary side of the 1A# transformer, the circuit breaker A (15) in the low-voltage distribution cabinet on the power supply side of the standby UPS, the rectifier-inverter circuit (27) of the standby UPS, the UPS output side circuit breaker A (16) in the low-voltage distribution cabinet on the load side of the standby UPS, the bypass power bus (11), the static bypass side circuit breaker B (24) in the low-voltage distribution cabinet on the power supply side of the main UPS, the external maintenance bypass bus (25) of the main UPS, and the maintenance bypass side circuit breaker B (23) in the low-voltage distribution cabinet on the load side of the main UPS to supply power to the load; When the UPSn2 is repaired or the fault is eliminated and a switch needs to be made, and the static bypass (30) of the main UPS is put into operation. When the synchro-check device (13) in the low-voltage distribution cabinet on the load side of the main UPS passes the synchro-check, the UPS output side circuit breaker A (22) in the low-voltage distribution cabinet on the load side of the main UPS performs a closing operation; The maintenance bypass side circuit breaker B (23) in the low-voltage distribution cabinet on the load side of the main UPS performs a tripping operation; After confirming that the power supply voltage and frequency of the power supply side of the rectifier-inverter circuit (29) of the main UPS are normal, and the rectifier-inverter circuit (29) of the main UPS performs an operation to be put into operation, the UPSn2 automatically switches from the static bypass (30) of the main UPS to the rectifier-inverter circuit (29) of the main UPS for power supply; After confirming that there is no current in the three phases at the position of the static bypass side circuit breaker B (24) in the low-voltage distribution cabinet on the power supply side of the main UPS, the static bypass side circuit breaker B (24) in the low-voltage distribution cabinet on the power supply side of the main UPS performs a tripping operation;The circuit breaker A (19) in the low-voltage side distribution cabinet of the 2B# transformer performs the closing operation. At this time, the load originally powered by UPS0 is powered by UPSn2, completing the process of switching from the standby UPS power supply to the load to the main UPS power supply to the load. At this time, the power supply is supplied to the load through the horizontal busbar (9) of the low-voltage side distribution cabinet of the 2A# transformer, the circuit breaker A (18) in the low-voltage side distribution cabinet of the 2A# transformer, the rectifier-inverter circuit breaker C (20) on the power supply side of the main UPS in the low-voltage distribution cabinet, the rectifier-inverter circuit (29) of the main UPS, and the UPS output circuit breaker A (22) on the load side of the main UPS in the low-voltage distribution cabinet;

[0034] Mode 3: When the rectifier-inverter circuit of UPSn2 has stopped operating and the power supply is provided by UPS0, if UPS0 also needs to stop operating due to reasons at this time, the operation process is as follows: The initial state is that the circuit breaker A (14) in the low-voltage side distribution cabinet of the 1A# transformer is in the closing state, the circuit breaker A (15) on the power supply side of the standby UPS in the low-voltage distribution cabinet is in the closing state, the static bypass (28) of the standby UPS is put into operation, the UPS output circuit breaker A (16) on the load side of the standby UPS in the low-voltage distribution cabinet is in the closing state, the static bypass circuit breaker B (24) on the power supply side of the main UPS in the low-voltage distribution cabinet is in the closing state, and the maintenance bypass circuit breaker B (23) on the load side of the main UPS in the low-voltage distribution cabinet is in the closing state. The power supply is supplied to the load through the horizontal busbar (7) of the low-voltage side distribution cabinet of the 1A# transformer, the circuit breaker A (14) in the low-voltage side distribution cabinet of the 1A# transformer, the circuit breaker A (15) on the power supply side of the standby UPS in the low-voltage distribution cabinet, the static bypass (28) of the standby UPS, the UPS output circuit breaker A (16) on the load side of the standby UPS in the low-voltage distribution cabinet, the bypass power busbar (11), the static bypass circuit breaker B (24) on the power supply side of the main UPS in the low-voltage distribution cabinet, the external maintenance bypass busbar (25) of the main UPS, and the maintenance bypass circuit breaker B (23) on the load side of the main UPS in the low-voltage distribution cabinet; When switching is required, the maintenance bypass circuit breaker B (17) on the load side of the standby UPS performs the closing operation, and the UPS output circuit breaker A (16) on the load side of the standby UPS performs the opening operation. When the synchronization detection device (12) on the power supply side of the main UPS detects synchronization, the circuit breaker A (19) in the low-voltage side distribution cabinet of the 2B# transformer performs the closing operation, and then the static bypass circuit breaker B (24) on the power supply side of the main UPS performs the opening operation, and UPS0 shuts down and exits the operation; At this time, the power supply is supplied to the load through the circuit breaker A (19) in the low-voltage side distribution cabinet of the 2B# transformer, the low-voltage distribution cabinet (4) on the power supply side of the main UPS, the external maintenance bypass busbar (25) of the main UPS, and the maintenance bypass circuit breaker B (23) on the load side of the main UPS in the low-voltage distribution cabinet;

[0035] Method 4: When the rectifier-inverter circuit of UPSn2 has been taken out of operation and UPS0 in Method 3 needs to be restarted after troubleshooting, the operation process is as follows: The initial state is that the circuit breaker A (19) in the low-voltage distribution cabinet on the low-voltage side of the 2B# transformer is in the closed state, the static bypass circuit breaker B (24) in the low-voltage distribution cabinet on the main UPS power supply side is in the open state, the maintenance bypass circuit breaker B (23) in the low-voltage distribution cabinet on the main UPS load side is in the closed state, UPS0 has been shut down and taken out of operation, and the power supply is supplied to the load through the circuit breaker A (19) in the low-voltage distribution cabinet on the low-voltage side of the 2B# transformer, the low-voltage distribution cabinet (4) on the main UPS power supply side, the external maintenance bypass bus (25) of the main UPS, and the maintenance bypass circuit breaker B (23) in the low-voltage distribution cabinet on the main UPS load side; When a switchover is required, UPS0 is powered on, and the rectifier-inverter circuit (27) of the standby UPS in the rectifier-inverter circuit of UPS0 is put into operation. The UPS output circuit breaker A (16) in the low-voltage distribution cabinet on the standby UPS load side performs a closing operation. When the synchronization detection device (12) in the low-voltage distribution cabinet on the main UPS power supply side passes the synchronization detection, the static bypass circuit breaker B (24) in the low-voltage distribution cabinet on the main UPS power supply side performs a closing operation, and the circuit breaker A (19) in the low-voltage distribution cabinet on the low-voltage side of the 2B# transformer performs an opening operation; At this time, the power supply is supplied to the load through the circuit breaker A (14) in the low-voltage distribution cabinet on the low-voltage side of the 1A# transformer, the circuit breaker A (15) in the low-voltage distribution cabinet on the standby UPS power supply side, the rectifier-inverter circuit (27) of the standby UPS, the UPS output circuit breaker A (16) in the low-voltage distribution cabinet on the standby UPS load side, the bypass power bus (11), the static bypass circuit breaker B (24) in the low-voltage distribution cabinet on the main UPS power supply side, the external maintenance bypass bus (25) of the main UPS, and the maintenance bypass circuit breaker B (23) in the low-voltage distribution cabinet on the main UPS load side.

[0036] The utility model has the following advantages: the utility model patent discloses a redundant standby system and redundant standby method of UPS power supply, the system includes a transformer, a UPS host, a low-voltage distribution cabinet, a low-voltage circuit breaker, a dense bus, a synchronization device, and an auxiliary control system. The system does not have a common load-side bus. When the load-side bus of a single UPS fails, the impact range is limited to the equipment powered by the machine, and the power supply system has high reliability; the system is easy to realize later transformation, and UPS of different models and capacities can form the system; the main UPS and the standby UPS can be maintained separately, which can ensure that the load is still protected by the UPS during maintenance. After the construction of the chip factory is completed, with the increase in power load as the capacity increases, and the subsequent process transformation and improvement needs, when the UPS system needs to be expanded, UPS of different models and capacities can be connected to the original redundant system. The use of PLC to build an auxiliary control system largely avoids the occurrence of misoperation accidents and improves the intelligence of operation and maintenance. The bypass power supply of the main UPS is drawn from the main power supply and the load side of the standby UPS. When the main UPS is normal, the standby UPS is not loaded, so the loss of the standby UPS is very low. The maintainability and fault tolerance of the UPS system are significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a system wiring scheme diagram in the utility model.

[0038] Wherein: 1 - Low-voltage distribution cabinet on the standby UPS power supply side, 2 - Standby UPS and its battery pack, 3 - Low-voltage distribution cabinet on the standby UPS load side, 4 - Low-voltage distribution cabinet on the main UPS power supply side, 5 - Main UPS and its battery pack, 6 - Low-voltage distribution cabinet on the main UPS load side, 7 - Horizontal busbar of the low-voltage side distribution cabinet of Transformer 1A#, 8 - Horizontal busbar of the low-voltage side distribution cabinet of Transformer 1B#, 9 - Horizontal busbar of the low-voltage side distribution cabinet of Transformer 2A#, 10 - Horizontal busbar of the low-voltage side distribution cabinet of Transformer 2B#, 11 - Bypass power busbar, 12 - In-spection synchroscope in the low-voltage distribution cabinet on the main UPS power supply side, 13 - In-spection synchroscope in the low-voltage distribution cabinet on the main UPS load side, 14 - Circuit breaker A in the low-voltage side distribution cabinet of Transformer 1A#, 15 - Circuit breaker A in the low-voltage distribution cabinet on the standby UPS power supply side, 16 - Circuit breaker A on the UPS output side in the low-voltage distribution cabinet on the standby UPS load side, 17 - Circuit breaker B on the maintenance bypass side in the low-voltage distribution cabinet on the standby UPS load side, 18 - Circuit breaker A in the low-voltage side distribution cabinet of Transformer 2A#, 19 - Circuit breaker A in the low-voltage side distribution cabinet of Transformer 2B#, 20 - Rectifier-inverter circuit breaker C in the low-voltage distribution cabinet on the main UPS power supply side, 21 - Static bypass circuit breaker A in the low-voltage distribution cabinet on the main UPS power supply side, 22 - Circuit breaker A on the UPS output side in the low-voltage distribution cabinet on the main UPS load side, 23 - Circuit breaker B on the maintenance bypass side in the low-voltage distribution cabinet on the standby UPS load side, 24 - Static bypass circuit breaker B in the low-voltage distribution cabinet on the main UPS power supply side, 25 - External maintenance bypass busbar of the main UPS, 26 - External maintenance bypass busbar of the standby UPS, 27 - Rectifier-inverter circuit of the standby UPS, 28 - Static bypass of the standby UPS, 29 - Rectifier-inverter circuit of the main UPS, 30 - Static bypass of the main UPS.

[0039] In the figure, UPS0, UPS1, UPSn1, UPSn2, UPSn3 are UPS numbers. Among them, UPS0 is the standby UPS, and UPS1 to UPSn1, UPSn to UPSn3 are the main UPSs. Detailed implementation manners

[0040] The following will combine with the attached Figure 1 The present invention will be described in detail below. The technical solutions in the embodiments of the present invention will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0041] The present invention provides a redundant standby system for a UPS power supply here. The following will combine with the attached Figure 1 to give a detailed implementation description thereof;

[0042] The system includes the low-voltage power distribution cabinet 1 on the standby UPS power supply side, the standby UPS and its battery pack 2, the low-voltage power distribution cabinet 3 on the standby UPS load side, the low-voltage power distribution cabinet 4 on the main UPS power supply side, the main UPS and its battery pack 5, the low-voltage power distribution cabinet 6 on the main UPS load side, the horizontal busbar 7 of the low-voltage side power distribution cabinet of the 1A# transformer, the horizontal busbar 8 of the low-voltage side power distribution cabinet of the 1B# transformer, the horizontal busbar 9 of the low-voltage side power distribution cabinet of the 2A# transformer, the horizontal busbar 10 of the low-voltage side power distribution cabinet of the 2B# transformer, the bypass power busbar 11, the circuit breaker A14 in the low-voltage side power distribution cabinet of the 1A# transformer, the circuit breaker A18 in the low-voltage side power distribution cabinet of the 2A# transformer, the circuit breaker A19 in the low-voltage side power distribution cabinet of the 1B# transformer, the external maintenance bypass busbar 25 of the main UPS, and the external maintenance bypass busbar 26 of the standby UPS;

[0043] The low-voltage power distribution cabinet 1 on the standby UPS power supply side includes the circuit breaker A15 in the low-voltage power distribution cabinet on the standby UPS power supply side;

[0044] The standby UPS and its battery pack 2 include the rectifier-inverter circuit 27 of the standby UPS, the static bypass 28 of the standby UPS, and the battery pack of the standby UPS;

[0045] The low-voltage power distribution cabinet 3 on the standby UPS load side includes the UPS output side circuit breaker A16 in the low-voltage power distribution cabinet on the standby UPS load side and the maintenance bypass side circuit breaker B17 in the low-voltage power distribution cabinet on the standby UPS load side;

[0046] The low-voltage power distribution cabinet 4 on the main UPS power supply side includes the synchronization detection device 12 in the power distribution cabinet on the main UPS power supply side, the rectifier-inverter side circuit breaker C20 in the low-voltage power distribution cabinet on the main UPS power supply side, the static bypass side circuit breaker A21 in the low-voltage power distribution cabinet on the main UPS power supply side, and the static bypass side circuit breaker B24 in the low-voltage power distribution cabinet on the main UPS power supply side;

[0047] The main UPS and its battery pack 5 include the rectifier-inverter circuit 29 of the main UPS, the static bypass 30 of the main UPS, and the battery pack of the main UPS;

[0048] The low-voltage power distribution cabinet 6 on the main UPS load side includes the synchronization detection device 13 in the power distribution cabinet on the main UPS load side, the UPS output side circuit breaker A22 in the low-voltage power distribution cabinet on the main UPS load side, and the maintenance bypass side circuit breaker B23 in the low-voltage power distribution cabinet on the main UPS load side;

[0049] The UPS adopts the double-conversion mode and includes a rectifier-inverter circuit and a static bypass. When the rectifier-inverter circuit fails, it can automatically switch to the static bypass through the static switch, and the load will not lose power during the switching; also when the rectifier-inverter circuit fault is eliminated, it can automatically switch from the static bypass to the rectifier-inverter circuit through the static switch, and the load will not lose power during the switching;

[0050] The synchronization checking device detects the voltage difference, frequency difference, and phase difference between the power supplies at two sampling points, and outputs a signal indicating that the synchronization check has passed when the voltage difference, frequency difference, and phase difference meet the preset conditions.

[0051] The horizontal busbars 7 of the low-voltage distribution cabinet on the secondary side of the 1A# transformer, the horizontal busbars 8 of the low-voltage distribution cabinet on the secondary side of the 1B# transformer, the horizontal busbars 9 of the low-voltage distribution cabinet on the secondary side of the 2A# transformer, and the horizontal busbars 10 of the low-voltage distribution cabinet on the secondary side of the 2B# transformer are located on the power supply side of the UPS; the low-voltage distribution cabinet 1 on the power supply side of the standby UPS is located on the power supply side of the standby UPS and its battery pack 2; the low-voltage distribution cabinet 3 on the load side of the standby UPS, the low-voltage distribution cabinet 4 on the power supply side of the main UPS, and the bypass power busbar 11 are located on the load side of the standby UPS and its battery pack 2; the low-voltage distribution cabinet 4 on the power supply side of the main UPS is located on the power supply side of the main UPS and its battery pack 5; the low-voltage distribution cabinet 6 on the load side of the main UPS is located on the load side of the main UPS and its battery pack 5; the bypass power busbar 11 is located on the load side of the low-voltage distribution cabinet 3 on the load side of the standby UPS; the bypass power busbar 11 is located on the power supply side of the low-voltage distribution cabinet 4 on the power supply side of the main UPS.

[0052] A cable is used to connect the horizontal busbars 7 of the low-voltage distribution cabinet on the secondary side of the 1A# transformer and the low-voltage distribution cabinet 1 on the power supply side of the standby UPS; a cable is used to connect the low-voltage distribution cabinet 1 on the power supply side of the standby UPS and the standby UPS and its battery pack 2; a cable is used to connect the standby UPS and its battery pack 2 and the low-voltage distribution cabinet 3 on the load side of the standby UPS; a cable is used to connect the low-voltage distribution cabinet 3 on the load side of the standby UPS and the bypass power busbar 11; a cable is used to connect the bypass power busbar 11 and the low-voltage distribution cabinet 4 on the power supply side of the main UPS; a cable is used to connect the low-voltage distribution cabinet 4 on the power supply side of the main UPS and the main UPS and its battery pack 5; a cable is used to connect the main UPS and its battery pack 5 and the low-voltage distribution cabinet 6 on the load side of the main UPS; a cable is used to connect the horizontal busbars 9 of the low-voltage distribution cabinet on the secondary side of the 2A# transformer and the low-voltage distribution cabinet 4 on the power supply side of the main UPS; a cable is used to connect the horizontal busbars 10 of the low-voltage distribution cabinet on the secondary side of the 2B# transformer and the low-voltage distribution cabinet 4 on the power supply side of the main UPS.

[0053] Each circuit breaker is fixed in the low-voltage distribution cabinet and connected to the busbars in the distribution cabinet using copper bars.

[0054] The synchronization checking device 12 in the low-voltage distribution cabinet on the power supply side of the main UPS and the synchronization checking device 13 in the low-voltage distribution cabinet on the load side of the main UPS are fixed in the low-voltage distribution cabinet and connected to the sampling points using copper-core insulated wires.

[0055] The horizontal busbars 7 of the low-voltage distribution cabinet on the secondary side of the 1A# transformer, the horizontal busbars 8 of the low-voltage distribution cabinet on the secondary side of the 1B# transformer, the horizontal busbars 9 of the low-voltage distribution cabinet on the secondary side of the 2A# transformer, and the horizontal busbars 10 of the low-voltage distribution cabinet on the secondary side of the 2B# transformer are all in a live state.

[0056] For this system, it can be manually operated. Or, to improve the automation level to prevent misoperation and enhance the operation and maintenance efficiency, an auxiliary automatic control system can be set up.

[0057] For this system, the bypass incoming line sides of the main UPS respectively draw power from the low-voltage side power distribution cabinet of the transformer and the load side power distribution bus of the standby UPS.

[0058] For this system, on the power supply sides of the static bypass and maintenance bypass of the main UPS, there are two power supplies, one from the transformer and the other from the standby UPS. And a synchronization checking device is set between the power supply from the transformer and the power supply from the standby UPS. When the synchronization check passes, it is possible to first switch on the power supply from the standby UPS and then cut off the power supply from the transformer, or first switch on the power supply from the transformer and then cut off the power supply from the standby UPS, so that the static bypass and maintenance bypass of the UPS are continuously powered during the mutual switching of the two power supplies.

[0059] For this system, the main circuit power supply and the bypass power supply of the standby UPS adopt the same power line.

[0060] For this system, in the low-voltage power distribution cabinet on the load side of the main UPS, there are two power supplies, one from the main UPS and the other from the external maintenance bypass bus of the main UPS. And a synchronization checking device is set between the power supply from the main UPS and the power supply from the external maintenance bypass bus of the main UPS. When the synchronization check passes, it is possible to first switch on the power supply from the main UPS and then cut off the power supply from the external maintenance bypass bus of the main UPS, or first switch on the power supply from the external maintenance bypass bus of the main UPS and then cut off the power supply from the main UPS, so that the load side of the low-voltage power distribution cabinet on the load side of the main UPS is continuously powered during the mutual switching of the two power supplies.

[0061] For this system, under normal circumstances, the main UPS supplies power to the load through the rectifier-inverter circuit. When its rectifier-inverter circuit fails, the UPS will automatically switch to the static bypass through the static switch and be powered by the transformer to the load. When the synchronization condition is met between the power supply from the transformer and the power supply from the standby UPS, it can be switched to the standby UPS to supply power to the load, and the load is continuously powered during the switching process.

[0062] For this system, when the main UPS can be put into use, the static bypass of the main UPS is first put into operation, and then it will automatically switch to the rectifier-inverter circuit to supply power to the load through the static bypass, and then disconnect the connection with the external maintenance bypass bus of the main UPS. The load is continuously powered during the switching process.

[0063] For this system, when both the main UPS and the standby UPS need to be taken out of service, power is directly supplied to the load from the low-voltage side of the transformer, and the load remains powered during the switching process.

[0064] For this system, when the main UPS is taken out of service and the standby UPS can resume operation, power supply to the load from the low-voltage side of the transformer is switched to power supply by the standby UPS to the load, and the load remains powered during the switching process.

[0065] For this system, when the main UPS supplies power to the load, the rectifier-inverter circuit of the main UPS is put into operation. When the standby UPS supplies power to the load, the rectifier-inverter circuit of the standby UPS is put into operation. In both operating conditions, the load is powered by the rectifier-inverter circuit.

[0066] A redundant standby method for a UPS power supply, the implementation process is as follows:

[0067] Method 1: Taking the switching between the standby UPS0 and the main UPSn2 as an example, the process of switching from the main UPS power supply to the load to the standby UPS power supply to the load is as follows: The initial state is that the UPS0 is in a normal state and in a hot standby state, and the circuit breaker A16 on the output side of the UPS in the low-voltage distribution cabinet on the load side of the standby UPS is in the closed state, and the rectifier-inverter circuit 29 of the main UPS is in the working state and outputs power, and the current at the position of the circuit breaker A22 on the output side of the UPS in the low-voltage distribution cabinet on the load side of the main UPS is greater than zero. At this time, the power supply is supplied to the load through the horizontal bus 9 of the low-voltage distribution cabinet on the low-voltage side of the 2A# transformer, the circuit breaker A18 in the low-voltage distribution cabinet on the low-voltage side of the 2A# transformer, the rectifier-inverter side circuit breaker C20 in the low-voltage distribution cabinet on the power supply side of the main UPS, the rectifier-inverter circuit 29 of the main UPS, and the circuit breaker A22 on the output side of the UPS in the low-voltage distribution cabinet on the load side of the main UPS; When the UPSn2 is planned for maintenance or fails and needs to be switched, after the circuit breaker A19 at the position in the low-voltage distribution cabinet on the low-voltage side of the 1B# transformer detects no current, the circuit breaker A19 in the low-voltage distribution cabinet on the low-voltage side of the 1B# transformer performs the opening action; The static bypass circuit breaker B24 in the low-voltage distribution cabinet on the power supply side of the main UPS is closed; After confirming that the bypass power supply voltage and frequency of the UPSn2 are normal, the rectifier-inverter circuit 29 of the main UPS performs the closing action, and the UPSn2 automatically switches from the rectifier-inverter circuit 29 of the main UPS to the static bypass 30 of the main UPS for power supply; After confirming that there is three-phase current at the position of the static bypass circuit breaker B24 in the low-voltage distribution cabinet on the power supply side of the main UPS and the synchronization detection device 13 in the low-voltage distribution cabinet on the load side of the main UPS passes the synchronization detection, the maintenance bypass circuit breaker B23 in the low-voltage distribution cabinet on the load side of the main UPS performs the closing action; After confirming that the current of the maintenance bypass circuit breaker B23 in the low-voltage distribution cabinet on the load side of the main UPS is greater than zero, the circuit breaker A22 on the output side of the UPS in the low-voltage distribution cabinet on the load side of the main UPS performs the opening action; At this time, the load originally powered by the UPSn2 is powered by the UPS0, and the process of switching from the main UPS power supply to the load to the standby UPS power supply to the load is completed; At this time, the power supply is supplied to the load through the horizontal bus 7 of the low-voltage distribution cabinet on the low-voltage side of the 1A# transformer, the circuit breaker A14 in the low-voltage distribution cabinet on the low-voltage side of the 1A# transformer, the circuit breaker A15 in the low-voltage distribution cabinet on the power supply side of the standby UPS, the rectifier-inverter circuit 27 of the standby UPS, the circuit breaker A16 on the output side of the UPS in the low-voltage distribution cabinet on the load side of the standby UPS, the bypass power supply bus 11, the static bypass circuit breaker B24 in the low-voltage distribution cabinet on the power supply side of the main UPS, the external maintenance bypass bus 25 of the main UPS, and the maintenance bypass circuit breaker B23 in the low-voltage distribution cabinet on the load side of the main UPS;

[0068] Method 2: Taking the switching between the standby UPS0 and the main UPSn2 as an example, the process of switching from the standby UPS power supply to the load to the main UPS power supply to the load is as follows: The initial state is that the rectifier-inverter circuit 27 of the standby UPS is in the working state and outputs power, and the load is powered by the external maintenance bypass bus 25 of the main UPS. The maintenance bypass side circuit breaker B23 in the low-voltage power distribution cabinet on the load side of the main UPS is in the closed state, the static bypass side circuit breaker B24 in the low-voltage power distribution cabinet on the power supply side of the main UPS is in the closed state, the UPS output side circuit breaker A16 in the low-voltage power distribution cabinet on the load side of the standby UPS is in the closed state, the UPS output side circuit breaker A22 in the low-voltage power distribution cabinet on the load side of the main UPS is in the open state, and the rectifier-inverter circuit 29 of the main UPS is in the closed state. At this time, the power supply passes through the horizontal bus 7 of the low-voltage power distribution cabinet on the secondary side of the 1A# transformer, the circuit breaker A14 in the low-voltage power distribution cabinet on the secondary side of the 1A# transformer, the circuit breaker A15 in the low-voltage power distribution cabinet on the power supply side of the standby UPS, the rectifier-inverter circuit 27 of the standby UPS, the UPS output side circuit breaker A16 in the low-voltage power distribution cabinet on the load side of the standby UPS, the bypass power bus 11, the static bypass side circuit breaker B24 in the low-voltage power distribution cabinet on the power supply side of the main UPS, the external maintenance bypass bus 25 of the main UPS, and the maintenance bypass side circuit breaker B23 in the low-voltage power distribution cabinet on the load side of the main UPS to supply power to the load; When the maintenance of UPSn2 is completed or the fault is eliminated and a switch needs to be made, and the static bypass 30 of the main UPS is put into operation. When the synchronization detection device 13 in the low-voltage power distribution cabinet on the load side of the main UPS passes the synchronization detection, the UPS output side circuit breaker A22 in the low-voltage power distribution cabinet on the load side of the main UPS performs a closing operation; The maintenance bypass side circuit breaker B23 in the low-voltage power distribution cabinet on the load side of the main UPS performs an opening operation; After confirming that the power supply voltage and frequency of the power supply side of the rectifier-inverter circuit 29 of the main UPS are normal, and the rectifier-inverter circuit 29 of the main UPS performs an operation to put into operation, UPSn2 automatically switches from the static bypass 30 of the main UPS to the rectifier-inverter circuit 29 of the main UPS for power supply; After confirming that there is no current in the three phases at the position of the static bypass side circuit breaker B24 in the low-voltage power distribution cabinet on the power supply side of the main UPS, the static bypass side circuit breaker B24 in the low-voltage power distribution cabinet on the power supply side of the main UPS performs an opening operation; The circuit breaker A19 in the low-voltage power distribution cabinet on the secondary side of the 2B# transformer performs a closing operation. At this time, the load originally powered by UPS0 is powered by UPSn2, and the process of switching from the standby UPS power supply to the load to the main UPS power supply to the load is completed. At this time, the power supply passes through the horizontal bus 9 of the low-voltage power distribution cabinet on the secondary side of the 2A# transformer, the circuit breaker A18 in the low-voltage power distribution cabinet on the secondary side of the 2A# transformer, the rectifier-inverter side circuit breaker C20 in the low-voltage power distribution cabinet on the power supply side of the main UPS, and the rectifier-inverter circuit 29 of the main UPS, and the UPS output side circuit breaker A22 in the low-voltage power distribution cabinet on the load side of the main UPS to supply power to the load;

[0069] Method 3: When the rectifier-inverter circuit of UPSn2 has been taken out of operation and powered by UPS0, if UPS0 also needs to be taken out of operation due to reasons at this time, the operation process is as follows: The initial state is: the circuit breaker A14 in the low-voltage distribution cabinet on the low-voltage side of the 1A# transformer is in the closed state, the circuit breaker A15 in the low-voltage distribution cabinet on the standby UPS power supply side is in the closed state, the static bypass 28 of the standby UPS is put into operation, the circuit breaker A16 on the UPS output side in the low-voltage distribution cabinet on the standby UPS load side is in the closed state, the circuit breaker B24 on the static bypass side in the low-voltage distribution cabinet on the main UPS power supply side is in the closed state, the circuit breaker B23 on the maintenance bypass side in the low-voltage distribution cabinet on the main UPS load side is in the closed state, and the power supply is supplied to the load through the horizontal busbar 7 in the low-voltage distribution cabinet on the low-voltage side of the 1A# transformer, the circuit breaker A14 in the low-voltage distribution cabinet on the low-voltage side of the 1A# transformer, the circuit breaker A15 in the low-voltage distribution cabinet on the standby UPS power supply side, the static bypass 28 of the standby UPS, the circuit breaker A16 on the UPS output side in the low-voltage distribution cabinet on the standby UPS load side, the bypass power busbar 11, the circuit breaker B24 on the static bypass side in the low-voltage distribution cabinet on the main UPS power supply side, the external maintenance bypass busbar 25 of the main UPS, and the circuit breaker B23 on the maintenance bypass side in the low-voltage distribution cabinet on the main UPS load side; when switching is required, the circuit breaker B17 on the maintenance bypass side in the low-voltage distribution cabinet on the standby UPS load side performs a closing operation, and the circuit breaker A16 on the UPS output side in the low-voltage distribution cabinet on the standby UPS load side performs a tripping operation. When the synchronism detection device 12 in the low-voltage distribution cabinet on the main UPS power supply side passes the synchronism detection, the circuit breaker A19 in the low-voltage distribution cabinet on the low-voltage side of the 2B# transformer performs a closing action, and then the circuit breaker B24 on the static bypass side in the low-voltage distribution cabinet on the main UPS power supply side performs a tripping operation, and UPS0 shuts down and exits operation; at this time, the power supply is supplied to the load through the circuit breaker A19 in the low-voltage distribution cabinet on the low-voltage side of the 2B# transformer, the low-voltage distribution cabinet 4 on the main UPS power supply side, the external maintenance bypass busbar 25 of the main UPS, and the circuit breaker B23 on the maintenance bypass side in the low-voltage distribution cabinet on the main UPS load side;

[0070] Mode 4: When the rectifier-inverter circuit of UPSn2 has been taken out of service and UPS0 in Mode 3 needs to be put back into service after troubleshooting, the operation process is as follows: The initial state is that the circuit breaker A19 in the low-voltage distribution cabinet on the low-voltage side of the 2B# transformer is in the closed state, the static bypass circuit breaker B24 in the low-voltage distribution cabinet on the power supply side of the main UPS is in the open state, the maintenance bypass circuit breaker B23 in the low-voltage distribution cabinet on the load side of the main UPS is in the closed state, UPS0 has been shut down and taken out of service, and the power supply is supplied to the load through the circuit breaker A19 in the low-voltage distribution cabinet on the low-voltage side of the 2B# transformer, the low-voltage distribution cabinet 4 on the power supply side of the main UPS, the external maintenance bypass bus 25 of the main UPS, and the maintenance bypass circuit breaker B23 in the low-voltage distribution cabinet on the load side of the main UPS; When a switchover is required, turn on UPS0, and the rectifier-inverter circuit 27 of the standby UPS in the rectifier-inverter circuit of UPS0 is put into operation. The UPS output circuit breaker A16 in the low-voltage distribution cabinet on the load side of the standby UPS performs a closing operation. When the synchronization detection device 12 in the low-voltage distribution cabinet on the power supply side of the main UPS passes the synchronization detection, the static bypass circuit breaker B24 in the low-voltage distribution cabinet on the power supply side of the main UPS performs a closing operation, and the circuit breaker A19 in the low-voltage distribution cabinet on the low-voltage side of the 2B# transformer performs an opening operation; At this time, the power supply is supplied to the load through the circuit breaker A14 in the low-voltage distribution cabinet on the low-voltage side of the 1A# transformer, the circuit breaker A15 in the low-voltage distribution cabinet on the power supply side of the standby UPS, the rectifier-inverter circuit 27 of the standby UPS, the UPS output circuit breaker A16 in the low-voltage distribution cabinet on the load side of the standby UPS, the bypass power bus 11, the static bypass circuit breaker B24 in the low-voltage distribution cabinet on the power supply side of the main UPS, the external maintenance bypass bus 25 of the main UPS, and the maintenance bypass circuit breaker B23 in the low-voltage distribution cabinet on the load side of the main UPS.

[0071] The switchover between the standby UPS0 and any other main UPS can also follow the above process. Although this switchover process only describes the switchover process between the standby UPS and one main UPS, obviously, when the capacity of the standby UPS is sufficient, it can be used as a standby for multiple main UPSs.

[0072] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A redundant backup system for a UPS power supply, characterized in that: The system comprises a low-voltage distribution cabinet (1) on the power supply side of a standby UPS, a standby UPS and its battery pack (2), a low-voltage distribution cabinet (3) on the load side of a standby UPS, a low-voltage distribution cabinet (4) on the power supply side of a main UPS, a main UPS and its battery pack (5), a low-voltage distribution cabinet (6) on the load side of a main UPS, a horizontal busbar (7) on the low-voltage side distribution cabinet of a 1A# transformer, a horizontal busbar (8) on the low-voltage side distribution cabinet of a 1B# transformer, a horizontal busbar (9) on the low-voltage side distribution cabinet of a 2A# transformer, a horizontal busbar (10) on the low-voltage side distribution cabinet of a 2B# transformer, a bypass power busbar (11), a circuit breaker A (14) in the low-voltage side distribution cabinet of a 1A# transformer, a circuit breaker A (18) in the low-voltage side distribution cabinet of a 2A# transformer, a circuit breaker A (19) in the low-voltage side distribution cabinet of a 1B# transformer, an external maintenance bypass busbar (25) of a main UPS, and an external maintenance bypass busbar (26) of a standby UPS; The low-voltage distribution cabinet (1) on the backup UPS power supply side comprises a circuit breaker A (15) in the low-voltage distribution cabinet on the backup UPS power supply side; The backup UPS and its battery pack (2) include a rectifier inverter circuit (27) of the backup UPS, a static bypass circuit (28) of the backup UPS, and a battery pack of the backup UPS; The standby UPS load-side low-voltage distribution cabinet (3) comprises a UPS output-side circuit breaker A (16) in the standby UPS load-side low-voltage distribution cabinet and a maintenance bypass-side circuit breaker B (17) in the standby UPS load-side low-voltage distribution cabinet; The main UPS power supply side low-voltage distribution cabinet (4) comprises a detection synchronization device (12) in the main UPS power supply side distribution cabinet, a rectifier inverter side circuit breaker C (20) in the main UPS power supply side low-voltage distribution cabinet, a static bypass side circuit breaker A (21) in the main UPS power supply side low-voltage distribution cabinet, and a static bypass side circuit breaker B (24) in the main UPS power supply side low-voltage distribution cabinet; The main UPS and its battery pack (5) comprise a main UPS rectification and inversion circuit (29), a main UPS static bypass (30) and a main UPS battery pack; The main UPS load-side low-voltage distribution cabinet (6) comprises a detection synchronization device (13) in the main UPS load-side distribution cabinet, a UPS output-side circuit breaker A (22) in the main UPS load-side low-voltage distribution cabinet, and a maintenance bypass-side circuit breaker B (23) in the main UPS load-side low-voltage distribution cabinet; The horizontal busbar (7) of the 1A# transformer low-voltage side distribution cabinet, the horizontal busbar (8) of the 1B# transformer low-voltage side distribution cabinet, the horizontal busbar (9) of the 2A# transformer low-voltage side distribution cabinet, and the horizontal busbar (10) of the 2B# transformer low-voltage side distribution cabinet are located on the power supply side of the UPS; the low-voltage distribution cabinet (1) on the power supply side of the standby UPS is located on the power supply side of the standby UPS and its battery pack (2); the low-voltage distribution cabinet (3) on the load side of the standby UPS, the low-voltage distribution cabinet (4) on the power supply side of the main UPS, and the bypass power supply The busbar (11) is located on the load side of the standby UPS and its battery pack (2); the low-voltage distribution cabinet (4) on the power supply side of the main UPS is located on the power supply side of the main UPS and its battery pack (5); the low-voltage distribution cabinet (6) on the load side of the main UPS is located on the load side of the main UPS and its battery pack (5); the bypass power busbar (11) is located on the load side of the low-voltage distribution cabinet (3) on the load side of the standby UPS; the bypass power busbar (11) is located on the power supply side of the low-voltage distribution cabinet (4) on the power supply side of the main UPS; A cable is used to connect the horizontal busbar (7) of the 1A# transformer low-voltage side distribution cabinet to the low-voltage distribution cabinet (1) on the standby UPS power supply side; a cable is used to connect the low-voltage distribution cabinet (1) on the standby UPS power supply side to the standby UPS and its battery pack (2); a cable is used to connect the standby UPS and its battery pack (2) to the low-voltage distribution cabinet (3) on the standby UPS load side; a cable is used to connect the low-voltage distribution cabinet (3) on the standby UPS load side to the bypass power busbar (11); and a cable is used to connect the bypass power busbar (11) to the low-voltage distribution cabinet (4) on the main UPS power supply side. A cable is used to connect the low-voltage distribution cabinet (4) on the power supply side of the main UPS and the main UPS and its battery pack (5); a cable is used to connect the main UPS and its battery pack (5) and the low-voltage distribution cabinet (6) on the load side of the main UPS; a cable is used to connect the horizontal busbar (9) of the distribution cabinet on the low-voltage side of the 2A# transformer and the low-voltage distribution cabinet (4) on the power supply side of the main UPS; and a cable is used to connect the horizontal busbar (10) of the distribution cabinet on the low-voltage side of the 2B# transformer and the low-voltage distribution cabinet (4) on the power supply side of the main UPS.

2. The redundant backup system of a UPS power supply according to claim 1, characterized in that: Each circuit breaker is fixed in the low-voltage distribution cabinet and connected to the copper busbar in the distribution cabinet by a copper busbar; The main UPS power supply side distribution cabinet internal inspection synchronization device (12) and the main UPS load side distribution cabinet internal inspection synchronization device (13) are fixed in the low-voltage distribution cabinet and connected to the sampling point using copper core insulated wires.

3. The redundant backup system of a UPS power supply according to claim 1, characterized in that: The bypass incoming line side of the main UPS draws power from the low-voltage side distribution cabinet of the transformer and the load-side distribution bus of the standby UPS.

4. The redundant backup system of a UPS power supply according to claim 1, characterized in that: On the power supply side of the static bypass and maintenance bypass of the main UPS, there are two power supplies, the power supply drawn from the transformer and the power supply drawn from the standby UPS, and a synchronization check device is set between the power supply drawn from the transformer and the power supply drawn from the standby UPS.

5. The redundant backup system of a UPS power supply according to claim 1, characterized in that: The main power supply and bypass power supply of the standby UPS use the same power circuit.

6. The redundant backup system of a UPS power supply according to claim 1, characterized in that: The low-voltage distribution cabinet on the load side of the main UPS is provided with two power supplies, one from the main UPS and the other from the external maintenance bypass bus of the main UPS, and a synchronization detection device is provided between the power supply from the main UPS and the power supply from the external maintenance bypass bus of the main UPS.

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