A power distribution system suitable for a two-of-one backup cooling system

Abstract

The utility model relates to the technical field of distribution system, especially suitable for distribution system of two -in -one standby cooling system, including alternating -current distribution unit, first cooling water pump, second cooling water pump, third cooling water pump, first starting unit, second starting unit, third starting unit and power switching unit, alternating -current distribution unit includes first alternating -current busbar and second alternating -current busbar of mutual electricity connection, first alternating -current busbar is connected with power switching unit and first starting unit electricity respectively, first starting unit is connected with first cooling water pump electricity, second alternating -current busbar is connected with power switching unit and third starting unit electricity respectively, third starting unit is connected with third cooling water pump electricity, second starting unit is connected with power switching unit and second cooling water pump electricity respectively, can when any one alternating -current busbar failure, cooling system still keeps 100% cooling capacity, reduces the number of distribution switch and power switching unit simultaneously, to reduce the equipment size and reduce cost.

Description

Technical Field

[0001] This utility model relates to the field of power distribution system technology, and in particular to a power distribution system suitable for a two-in-one-out cooling system. Background Technology

[0002] In the field of shipbuilding and marine engineering, cooling systems are a crucial component for ensuring the stable operation of equipment. They are mainly divided into seawater cooling systems and freshwater cooling systems. Seawater and freshwater cooling pumps serve as the power source for these systems, and their quantity, configuration, and power distribution stability directly determine the reliability of the cooling system. To ensure uninterrupted cooling capacity, conventional cooling systems typically employ a redundant configuration of "two in use and one standby," meaning two main pumps and one backup. This necessitates designing a suitable power distribution scheme for the three cooling pumps.

[0003] In existing technologies, there are two main power distribution methods for "two-in-one-out" cooling water pumps: The first method is segmented power distribution: two of the three cooling water pumps are powered by AC busbar A, and one is powered by AC busbar B. This method has a simple architecture, but it has a significant drawback: when a single point of failure (such as a short circuit) occurs on AC busbar A, the two main cooling water pumps will lose power at the same time, leaving only the cooling water pump powered by AC busbar B to work. The cooling system capacity will drop directly to 50%, which cannot meet the high requirements of ships and marine engineering for the redundancy of the cooling system, and may cause core equipment to shut down due to insufficient cooling.

[0004] The second method is a dual-circuit power distribution system: each cooling water pump is equipped with a dual-circuit power supply via an A-section AC busbar and a B-section AC busbar. This requires six power distribution switches on the AC power distribution unit, and each cooling water pump's starting unit needs to be equipped with a power switching unit. Although this method can ensure 100% cooling capacity even if any section of the AC busbar fails, it adds three power distribution switches and three power switching units, resulting in a significant increase in the size of the AC power distribution unit and starting unit. This not only occupies the limited equipment layout space on the ship, but also significantly increases the equipment procurement and installation costs, which does not meet the design requirements of "compact layout and controllable cost" in the field of shipbuilding and marine engineering.

[0005] In summary, existing power distribution solutions cannot simultaneously achieve "high redundancy", "small space occupation" and "low cost". Therefore, there is an urgent need for a power distribution system that can balance these three aspects to solve the power distribution pain points of ship and marine engineering cooling systems. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a power distribution system suitable for a dual-use, single-standby cooling system, which can maintain 100% cooling capacity when any AC busbar fails, while reducing the number of power distribution switches and power switching units to reduce equipment size and cost.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A power distribution system suitable for a dual-use, single-standby cooling system includes an AC power distribution unit, a first cooling water pump, a second cooling water pump, a third cooling water pump, a first starting unit, a second starting unit, a third starting unit, and a power switching unit. The AC power distribution unit includes a first AC busbar and a second AC busbar that are electrically connected to each other. The first AC busbar is electrically connected to the power switching unit and the first starting unit, respectively, and the first starting unit is electrically connected to the first cooling water pump; The second AC busbar is electrically connected to the power switching unit and the third starting unit, respectively, and the third starting unit is electrically connected to the third cooling water pump; The second starting unit is electrically connected to the power switching unit and the second cooling water pump.

[0008] Furthermore, the AC power distribution unit also includes a first power distribution switch, a second power distribution switch, a third power distribution switch, and a fourth power distribution switch; The first AC busbar is electrically connected to the first starting unit via the first power distribution switch; The first AC busbar is electrically connected to the power switching unit via the second power distribution switch; The second AC busbar is electrically connected to the power switching unit via the third power distribution switch; The second AC busbar is electrically connected to the third starting unit via the fourth power distribution switch.

[0009] Furthermore, the first, second, third, and fourth power distribution switches are all circuit breakers.

[0010] Furthermore, the AC power distribution unit also includes a tie switch, through which the first AC busbar and the second AC busbar are electrically connected.

[0011] Furthermore, the connecting switch is a circuit breaker.

[0012] Furthermore, the first and second cooling water pumps are the main cooling water pumps, the third cooling water pump is the standby cooling water pump, and the third starting unit is equipped with a selection switch.

[0013] Furthermore, the selection switch is a circuit breaker.

[0014] Furthermore, the voltages of the first AC busbar and the second AC busbar are equal.

[0015] Furthermore, the voltage of both the first AC busbar and the second AC busbar is AC400V or AC450V.

[0016] Furthermore, the voltages of the first, second, and third cooling water pumps are equal.

[0017] The beneficial effects of this utility model are as follows: This solution constructs a core architecture with dual AC busbar differentiated power supply (i.e., a differentiated power distribution mode where the dual AC busbars provide dual power to the second cooling water pump and single power to the first and third cooling water pumps) and a single power switching unit, by setting up an AC power distribution unit, a first cooling water pump, a second cooling water pump, a third cooling water pump, a first starting unit, a second starting unit, a third starting unit, and a power switching unit. Compared with the existing segmented power distribution method, this architecture, with the help of the power switching unit to support dual power supply to the second cooling water pump, allows the second AC busbar to supply power to the second cooling water pump through the power switching unit when the first AC busbar fails, while the third starting unit drives the third cooling water pump; when the second AC busbar fails, the first AC busbar... The second cooling water pump can be powered by a power switching unit, while the first starting unit drives the first cooling water pump to operate and maintain normal operation. This completely avoids the problem of cooling capacity being halved due to a single AC busbar failure in the existing segmented power distribution method, and significantly improves the power supply redundancy and operational reliability of the cooling system. Compared with the existing dual-path power distribution method, this architecture only requires one power switching unit to meet the dual-path power supply switching requirements. It does not require a power switching unit for each cooling water pump, which greatly reduces the number of power switching units used. This not only reduces equipment procurement costs and subsequent maintenance costs, but also effectively reduces the overall size of the AC power distribution unit and the starting unit, making it more suitable for the actual scenarios in the shipbuilding and marine engineering fields where equipment layout space is limited. Attached Figure Description

[0018] Figure 1 This is a connection block diagram of the power distribution system applicable to the two-in-one-standby cooling system of this utility model; Figure 2 This is the electrical schematic diagram of the power distribution system applicable to the two-in-one-standby cooling system of this utility model; Label Explanation: 1. AC power distribution unit; 101. First AC busbar; 102. Second AC busbar; 103. First power distribution switch; 104. Second power distribution switch; 105. Third power distribution switch; 106. Fourth power distribution switch; 107. Tie switch; 2. First cooling water pump; 3. Second cooling water pump; 4. Third cooling water pump; 5. First starting unit; 6. Second starting unit; 7. Third starting unit; 8. Power switching unit. Detailed Implementation

[0019] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0020] Please refer to Figure 1 A power distribution system suitable for a dual-use, single-standby cooling system includes an AC power distribution unit 1, a first cooling water pump 2, a second cooling water pump 3, a third cooling water pump 4, a first starting unit 5, a second starting unit 6, a third starting unit 7, and a power switching unit 8. The AC power distribution unit 1 includes a first AC busbar 101 and a second AC busbar 102 that are electrically connected to each other; The first AC busbar 101 is electrically connected to the power switching unit 8 and the first starting unit 5 respectively, and the first starting unit 5 is electrically connected to the first cooling water pump 2; The second AC busbar 102 is electrically connected to the power switching unit 8 and the third starting unit 7 respectively, and the third starting unit 7 is electrically connected to the third cooling water pump 4; The second starting unit 6 is electrically connected to the power switching unit 8 and the second cooling water pump 3.

[0021] As can be seen from the above description, the beneficial effects of this utility model are as follows: This solution constructs a core architecture with dual AC busbar differentiated power supply (i.e., a differentiated power distribution mode where the dual AC busbars provide dual power supply to the second cooling water pump 3 and single power supply to the first cooling water pump 2 and the third cooling water pump 4) and a single power switching unit 8, by setting up AC power distribution unit 1, first cooling water pump 2, second cooling water pump 3, third cooling water pump 4, first starting unit 5, second starting unit 6, third starting unit 7, and power switching unit 8. Compared with the existing segmented power distribution method, this architecture, with the dual power supply support for the second cooling water pump 3 by the power switching unit 8, allows the second AC busbar 102 to supply power to the second cooling water pump 3 through the power switching unit 8 when the first AC busbar 101 fails, while the third starting unit 7 drives the third cooling water pump 4 to operate; when the second AC busbar 102 fails... At the same time, the first AC busbar 101 can supply power to the second cooling water pump 3 through the power switching unit 8, while the first starting unit 5 drives the first cooling water pump 2 to operate and maintain normal operation. This completely avoids the problem of cooling capacity being halved due to a single AC busbar failure in the existing segmented power distribution method, and significantly improves the power supply redundancy and operational reliability of the cooling system. Compared with the existing dual-path power distribution method, this architecture only needs to be configured with one power switching unit 8 to meet the dual-path power supply switching requirements. It does not need to equip each cooling water pump with a power switching unit 8, which greatly reduces the number of power switching units 8 used. This not only reduces equipment procurement costs and subsequent maintenance costs, but also effectively reduces the overall size of the AC power distribution unit 1 and the starting unit, making it more suitable for the actual scenario of limited equipment layout space in the field of shipbuilding and marine engineering.

[0022] For further details, please refer to Figure 2 The AC power distribution unit 1 further includes a first power distribution switch 103, a second power distribution switch 104, a third power distribution switch 105 and a fourth power distribution switch 106; The first AC busbar 101 is electrically connected to the first starting unit 5 through the first power distribution switch 103; The first AC busbar 101 is electrically connected to the power switching unit 8 through the second power distribution switch 104; The second AC busbar 102 is electrically connected to the power switching unit 8 via the third power distribution switch 105; The second AC busbar 102 is electrically connected to the third starting unit 7 via the fourth power distribution switch 106.

[0023] As can be seen from the above description, by adding a first power distribution switch 103, a second power distribution switch 104, a third power distribution switch 105, and a fourth power distribution switch 106 to the AC power distribution unit 1, the first AC busbar 101 is connected to the first starting unit 5 through the first power distribution switch 103 and to the power switching unit 8 through the second power distribution switch 104. The second AC busbar 102 is connected to the power switching unit 8 through the third power distribution switch 105 and to the third starting unit 7 through the fourth power distribution switch 106. This achieves independent control of each power supply path, facilitates fault diagnosis and isolation, eliminates the need to shut down the entire system during maintenance, and improves the electrical safety of operators.

[0024] Furthermore, the first power distribution switch 103, the second power distribution switch 104, the third power distribution switch 105 and the fourth power distribution switch 106 are all circuit breakers.

[0025] As can be seen from the above description, by utilizing the short-circuit protection and overload protection functions of the circuit breaker, it can quickly trip when a short circuit occurs in the corresponding power supply path or the cooling water pump is overloaded, cut off the fault circuit, prevent the fault from spreading to the AC busbar, starting unit or cooling water pump, avoid equipment damage, and eliminate the need for additional protection devices, thus simplifying the system protection structure.

[0026] For further details, please refer to Figure 2 The AC power distribution unit 1 also includes a tie switch 107, through which the first AC busbar 101 and the second AC busbar 102 are electrically connected.

[0027] As can be seen from the above description, the addition of a tie switch 107 in the AC power distribution unit 1 enables the electrical connection of the first AC busbar 101 and the second AC busbar 102. Under normal operating conditions, closing the tie switch 107 can balance the load of the two AC busbars and prevent overheating of a single AC busbar. When any AC busbar fails, disconnecting the tie switch 107 can isolate the faulty AC busbar and prevent the fault from spreading. When a single AC busbar is under maintenance, it can be temporarily powered by another AC busbar through the tie switch 107 to avoid the cooling system from shutting down.

[0028] Furthermore, the connecting switch 107 is a circuit breaker.

[0029] As can be seen from the above description, the tie switch 107 is clearly a circuit breaker, which has the functions of connecting / disconnecting the two AC busbars and short-circuit and overload protection. It can automatically trip when there is a circulating current between the two AC busbars or when a section of the AC busbar is faulty, shortening the fault isolation time without manual operation. It also has a design to prevent misoperation, avoiding power supply disorder caused by human operation and improving system stability.

[0030] Furthermore, the first cooling water pump 2 and the second cooling water pump 3 are the main cooling water pumps, the third cooling water pump 4 is the standby cooling water pump, and the third starting unit 7 is equipped with a selection switch.

[0031] As can be seen from the above description, when the first cooling water pump 2 and the second cooling water pump 3 are set as the main cooling water pumps and the third cooling water pump 4 is set as the standby cooling water pump, a selection switch is set on the third starting unit 7. The standby water pump status can be flexibly adjusted by the selection switch (such as setting the first cooling water pump 2 or the second cooling water pump 3 as standby), avoiding excessive wear and tear from a single cooling water pump being used as the main pump for a long time or being idle for a long time, thus extending the service life of the equipment.

[0032] Furthermore, the selection switch is a circuit breaker.

[0033] As can be seen from the above description, the circuit breaker is clearly selected as the switch, which enables it to perform the switching control function of the standby cooling water pump while also having short-circuit and overload protection capabilities. It can automatically trip when the power supply path of the standby cooling water pump fails, protecting the standby cooling water pump and the starting unit, ensuring that the standby cooling water pump is always available, and the interlocking design of the circuit breaker can prevent accidental switching of the standby pump during operation, avoiding interruption of cooling capacity.

[0034] Furthermore, the voltages of the first AC busbar 101 and the second AC busbar 102 are equal.

[0035] As can be seen from the above description, ensuring that the voltages of the first AC busbar 101 and the second AC busbar 102 are equal can guarantee that when the power switching unit 8 switches power between the two AC busbars, the second cooling water pump 3 will not be damaged by voltage fluctuations. At the same time, it ensures that the operating voltages of the first cooling water pump 2 and the third cooling water pump 4 are consistent, avoiding uneven load distribution, extending the motor life, and eliminating the need to design a voltage conversion device, thus simplifying the structure of the AC power distribution unit 1.

[0036] For further details, please refer to Figure 2 The voltage of the first AC busbar 101 and the second AC busbar 102 is either AC400V or AC450V.

[0037] As can be seen from the above description, the voltage of the first AC busbar 101 and the second AC busbar 102 is clearly AC400V or AC450V, which is in line with the commonly used voltage level of low-voltage power distribution systems in the field of ships and marine engineering. They can be directly connected to the existing ship main power distribution network without additional modification. Moreover, this voltage level can match the needs of medium and high power cooling water pumps, cover the cooling needs of core equipment, and at the same time reduce the power loss of AC busbar transmission and improve power distribution efficiency.

[0038] For further details, please refer to Figure 2The voltages of the first cooling water pump 2, the second cooling water pump 3, and the third cooling water pump 4 are equal.

[0039] As can be seen from the above description, ensuring that the voltages of the first cooling water pump 2, the second cooling water pump 3, and the third cooling water pump 4 are equal facilitates the unified procurement of water pump models, reduces procurement costs, eliminates the need to adjust the power supply circuit voltage when replacing water pumps later, and reduces maintenance difficulty; the same voltage ensures that the water pump operating parameters (such as speed and power) are consistent, the cooling capacity of the main cooling water pump is stable, and the cooling effect can be quickly matched after the standby cooling water pump is put into operation, avoiding fluctuations in cooling capacity, while simplifying the design of the start-up unit control logic.

[0040] Please refer to Figure 1 and Figure 2 As shown, Embodiment 1 of this utility model is as follows: Please refer to Figure 1 A power distribution system suitable for a dual-use, single-standby cooling system includes an AC power distribution unit 1, a first cooling water pump 2 (model CLH125-100-17Z), a second cooling water pump 3 (model CLH125-100-17Z), a third cooling water pump 4 (model CLH125-100-17Z), a first starting unit 5 (model QC91), a second starting unit 6 (model QC91), a third starting unit 7 (model QC91), and a power switching unit 8 (model WATSN A-160). The AC power distribution unit 1 includes a first AC busbar 101 (model PZJ92) and a second AC busbar 102 (model PZJ92) that are electrically connected to each other. The first AC busbar 101 is electrically connected to the power switching unit 8 and the first starting unit 5 respectively, and the first starting unit 5 is electrically connected to the first cooling water pump 2; The second AC busbar 102 is electrically connected to the power switching unit 8 and the third starting unit 7 respectively, and the third starting unit 7 is electrically connected to the third cooling water pump 4; The second starting unit 6 is electrically connected to the power switching unit 8 and the second cooling water pump 3.

[0041] Please refer to Figure 2 The AC power distribution unit 1 also includes a first power distribution switch 103 (model NSX160N), a second power distribution switch 104 (model NSX160N), a third power distribution switch 105 (model NSX160N), and a fourth power distribution switch 106 (model NSX160N). The first AC busbar 101 is electrically connected to the first starting unit 5 through the first power distribution switch 103; The first AC busbar 101 is electrically connected to the power switching unit 8 through the second power distribution switch 104; The second AC busbar 102 is electrically connected to the power switching unit 8 via the third power distribution switch 105; The second AC busbar 102 is electrically connected to the third starting unit 7 via the fourth power distribution switch 106.

[0042] The first power distribution switch 103, the second power distribution switch 104, the third power distribution switch 105 and the fourth power distribution switch 106 are all circuit breakers.

[0043] Please refer to Figure 2 The AC power distribution unit 1 also includes a tie switch 107 (model NSX630N), through which the first AC busbar 101 and the second AC busbar 102 are electrically connected.

[0044] The connecting switch 107 is a circuit breaker.

[0045] The first cooling water pump 2 and the second cooling water pump 3 are the main cooling water pumps, the third cooling water pump 4 is the standby cooling water pump, and the third starting unit 7 is equipped with a selection switch.

[0046] The selector switch is a circuit breaker.

[0047] The voltages of the first AC busbar 101 and the second AC busbar 102 are equal.

[0048] The voltage of the first AC busbar 101 and the second AC busbar 102 is either AC400V or AC450V.

[0049] The voltages of the first cooling water pump 2, the second cooling water pump 3, and the third cooling water pump 4 are equal.

[0050] The voltage of the first cooling water pump 2, the second cooling water pump 3, and the third cooling water pump 4 is AC380V or AC440V.

[0051] The specific working principle of the power distribution system in this scheme is as follows: 1. Power supply and operation under normal working conditions: AC power distribution unit 1 power supply: The first AC busbar 101 (i.e. AC busbar A section) and the second AC busbar 102 (i.e. AC busbar B section) are both connected to the ship's main power distribution system, and the voltage is AC400V or AC450V. The closing of the tie switch 107 enables the two AC busbars to supply power in coordination to balance the load. The first cooling water pump 2 operates as follows: The first AC busbar 101 supplies power to the first starting unit 5 through the closed first power distribution switch 103. The first starting unit 5 drives the first cooling water pump 2 (as the main cooling water pump) to operate. The overload protector monitors the current of the first cooling water pump 2 in real time to prevent overload. The second cooling water pump 3 operates as follows: The first AC busbar 101 supplies power to the power switching unit 8 through the closed second power distribution switch 104, and the second AC busbar 102 supplies power to the power switching unit 8 through the closed third power distribution switch 105. The power switching unit 8 selects the power supply of one of the busbars (such as the first AC busbar 101) by default to supply power to the second starting unit 6, driving the second cooling water pump 3 (as the main cooling water pump) to run; if the default busbar voltage is normal, the second cooling water pump 3 will continue to run. The third cooling water pump 4 is on standby: The second AC busbar 102 supplies power to the third starting unit 7 through the closed fourth power distribution switch 106, but the third starting unit 7 does not drive the third cooling water pump 4 because the selector switch is in the "standby" state, and the third cooling water pump 4 is in standby state; the selector switch can be adjusted according to needs, such as setting the first cooling water pump 2 as standby and the third cooling water pump 4 as the main pump, at which time the first cooling water pump 2 is on standby and the third cooling water pump 4 is running.

[0052] 2. Automatic switching and protection under busbar failure conditions: (1) When the first AC busbar 101 fails: Fault detection: When the first AC busbar 101 is short-circuited or loses power, the first power distribution switch 103 will automatically trip due to short circuit / loss of voltage, cutting off the power supply path of the first cooling water pump 2, and the first cooling water pump 2 will stop; at the same time, the power switching unit 8 will detect the abnormal voltage of the first AC busbar 101. Power switching: The power switching unit 8 immediately drives the relay to switch the power supply to the second AC bus 102, and continues to supply power to the second starting unit 6 through the third power distribution switch 105, and the second cooling water pump 3 continues to run; Fault isolation: The tie switch 107 automatically trips due to a fault in the first AC busbar 101, which can prevent the fault from spreading to the second AC busbar 102; Standby cooling water pump activated: The first starting unit 5 detects that the first cooling water pump 2 has stopped and sends a signal to the third starting unit 7. The selector switch is switched to the "activated" state, and the third starting unit 7 drives the third cooling water pump 4 (i.e., the standby cooling water pump) to run. Cooling capacity maintenance: At this time, the second cooling water pump 3 (i.e., the main cooling water pump) and the third cooling water pump 4 (i.e., the standby cooling water pump) are operating normally, and the cooling system still maintains 100% cooling capacity.

[0053] (2) When the second AC busbar 102 fails: Fault detection: When the second AC busbar 102 fails, the fourth power distribution switch 106 trips automatically, and the standby circuit of the third cooling water pump 4 (i.e., the standby cooling water pump) is de-energized; the power switching unit 8 detects an abnormal voltage on the second AC busbar 102. Power switching: Power switching unit 8 switches the power supply to the first AC busbar 101, and continues to supply power to the second starting unit 6 through the second power distribution switch 104, so that the second cooling water pump 3 continues to run; Fault isolation: The automatic tripping of the tie switch 107 can prevent the fault from spreading to the second AC busbar 102; Standby cooling water pump activated: The third starting unit 7 detects a fault in the circuit of the third cooling water pump 4 and sends a signal to the first starting unit 5. If the first cooling water pump 2 is set as the standby cooling water pump, the first starting unit 5 drives the first cooling water pump 2 to start operation. Cooling capacity maintenance: With the first cooling water pump 2 (put into operation as a backup cooling water pump) and the second cooling water pump 3 (i.e. the main cooling water pump) operating normally, the cooling system still maintains 100% cooling capacity.

[0054] 3. Backup power supply in case of cooling water pump failure: If the first cooling water pump 2 (i.e. the main cooling water pump) is overloaded due to motor failure, the overload protector of the first starting unit 5 will be triggered, cutting off the power supply to the first cooling water pump 2 and stopping the first cooling water pump 2. The first starting unit 5 immediately sends a fault signal to the third starting unit 7, the selector switch automatically switches to the "engaged" state, and the third starting unit 7 drives the third cooling water pump 4 (i.e. the standby cooling water pump) to run; The second cooling water pump 3 continues to operate. At this time, the second cooling water pump 3 (i.e., the main cooling water pump) and the third cooling water pump 4 (put into operation as a backup cooling water pump) are operating normally, and there is no loss of cooling capacity. Similarly, if the second cooling water pump 3 fails, the power switching unit 8 can switch the power supply, and at the same time, the backup cooling water pump (the first cooling water pump 2 or the third cooling water pump 4) is put into operation. If the third cooling water pump 4 fails, the first cooling water pump 2 or the second cooling water pump 3 can be switched to the backup cooling water pump through the selection switch.

[0055] 4. Operation under maintenance and debugging conditions: When the first cooling water pump 2 needs to be repaired, disconnect the first power distribution switch 103 and the tie switch 107 (if the first AC busbar 101 needs to be repaired), and set the third cooling water pump 4 as the main cooling water pump through the selector switch. The third cooling water pump 4 runs, the second cooling water pump 3 continues to run, and the cooling system works normally. When the power switching unit 8 needs to be replaced, disconnect the second power distribution switch 104 and the third power distribution switch 105 to cut off the power supply to the power switching unit 8. At this time, the second cooling water pump 3 stops, but the first cooling water pump 2 and the third cooling water pump 4 (set as the main cooling water pump) operate normally, and the cooling capacity is maintained at 67% (to meet the emergency cooling needs). After the replacement is completed, close the switch and the second cooling water pump 3 resumes operation.

[0056] In summary, this utility model provides a power distribution system suitable for a dual-use, one-standby cooling system. By setting up an AC power distribution unit, a first cooling water pump, a second cooling water pump, a third cooling water pump, a first starting unit, a second starting unit, a third starting unit, and a power switching unit, it constructs a core architecture with differentiated power supply from dual AC buses (i.e., a differentiated power distribution mode where the dual AC buses provide dual power supply to the second cooling water pump and single power supply to the first and third cooling water pumps) and a single power switching unit for adaptation. Compared to existing segmented power distribution methods, this architecture, with the dual power supply support for the second cooling water pump from the power switching unit, allows the second AC bus to supply power to the second cooling water pump through the power switching unit in the event of a fault in the first AC bus, while the third starting unit drives the third cooling water pump to operate simultaneously. When two AC busbars fail, the first AC busbar can supply power to the second cooling water pump through the power switching unit. At the same time, the first starting unit drives the first cooling water pump to operate and maintain normal operation. This completely avoids the problem of cooling capacity being halved due to a single AC busbar failure in the existing segmented power distribution method, and significantly improves the power supply redundancy and operational reliability of the cooling system. Compared with the existing dual-path power distribution method, this architecture only needs to be configured with one power switching unit to meet the dual-path power supply switching requirements. It does not need to equip each cooling water pump with a power switching unit, which greatly reduces the number of power switching units used. This not only reduces equipment procurement costs and subsequent maintenance costs, but also effectively reduces the overall size of the AC power distribution unit and the starting unit, making it more suitable for the actual scenarios in the field of shipbuilding and marine engineering where equipment layout space is limited.

[0057] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A power distribution system suitable for a dual-use, single-standby cooling system, characterized in that, It includes an AC power distribution unit, a first cooling water pump, a second cooling water pump, a third cooling water pump, a first starting unit, a second starting unit, a third starting unit, and a power switching unit; The AC power distribution unit includes a first AC busbar and a second AC busbar that are electrically connected to each other. The first AC busbar is electrically connected to the power switching unit and the first starting unit, respectively, and the first starting unit is electrically connected to the first cooling water pump; The second AC busbar is electrically connected to the power switching unit and the third starting unit, respectively, and the third starting unit is electrically connected to the third cooling water pump; The second starting unit is electrically connected to the power switching unit and the second cooling water pump.

2. The electrical distribution system suitable for a 2N+1 cooling system according to claim 1, characterized in that, The AC power distribution unit also includes a first power distribution switch, a second power distribution switch, a third power distribution switch, and a fourth power distribution switch; The first AC busbar is electrically connected to the first starting unit via the first power distribution switch; The first AC busbar is electrically connected to the power switching unit via the second power distribution switch; The second AC busbar is electrically connected to the power switching unit via the third power distribution switch; The second AC busbar is electrically connected to the third starting unit via the fourth power distribution switch.

3. The power distribution system for a dual-use, single-standby cooling system according to claim 2, characterized in that, The first, second, third, and fourth power distribution switches are all circuit breakers.

4. The power distribution system suitable for a 2N-1 standby cooling system according to claim 1, wherein, The AC power distribution unit also includes a tie switch, through which the first AC busbar and the second AC busbar are electrically connected.

5. The power distribution system suitable for a 2N-1 standby cooling system according to claim 4, wherein, The connecting switch is a circuit breaker.

6. The electrical distribution system suitable for a 2N-1 redundant cooling system according to claim 1, characterized in that, The first and second cooling water pumps are the main cooling water pumps, the third cooling water pump is the standby cooling water pump, and the third starting unit is equipped with a selection switch.

7. The electrical distribution system suitable for a 2N-1 redundant cooling system according to claim 6, characterized in that, The selector switch is a circuit breaker.

8. The electrical distribution system suitable for a 2N-1 redundant cooling system according to claim 1, characterized in that, The voltages of the first AC busbar and the second AC busbar are equal.

9. The electrical distribution system suitable for a 2N-1 redundant cooling system according to claim 8, characterized in that, The voltage of both the first AC busbar and the second AC busbar is AC400V or AC450V.

10. The power distribution system for a dual-use, single-standby cooling system according to claim 1, characterized in that, The voltages of the first, second, and third cooling water pumps are equal.

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