Support three-way power supply for protection control system, method, device, processor and storage medium of preventing cooler total stop

Abstract

The present application relates to a kind of support three-way power supply for preventing the protection control system of cooler total stop, including first incoming line power circuit breaker, second incoming line power circuit breaker, third incoming line power circuit breaker, first path cooler power circuit breaker, multiple groups of cooler power circuit breaker, first through core mutual inductor, second through core mutual inductor, multiple groups of monitoring cooler current through core mutual inductor, first through core mutual inductor and second through core mutual inductor are used to monitor transformer cooling system, through core mutual inductor is used to monitor cooler current, multiple groups of cooler power circuit breaker and multiple groups of monitoring cooler current through core mutual inductor, for the protection control of each cooler branch.The support three-way power supply for preventing the protection control system, method, device, processor and its computer readable storage medium of cooler total stop of the present application, improve the reliability and flexibility of power supply, effectively avoid cooler total stop, prevent transformer oil temperature from being abnormally increased due to cooling system failure, cause greater operation accident.

Description

Technical Field

[0001] This invention relates to the field of power transformers, and more particularly to the field of cooling systems, specifically to a protection control system, method, apparatus, processor, and computer-readable storage medium thereof that supports three power supplies to prevent a complete shutdown of the cooler. Background Technology

[0002] To ensure that large power transformers operate within permissible temperatures, they are all equipped with forced oil circulation air cooling (referred to as forced oil air cooling). Under constant load and ambient temperature, if a forced oil air cooling transformer experiences a complete cooler shutdown during operation, the oil temperature will rise sharply, posing a significant threat to the transformer's internal insulation materials, potentially causing insulation aging and breakdown. If not handled promptly or properly, this can lead to transformer damage and even larger power grid accidents. Therefore, large forced oil circulation air cooling transformers are all equipped with cooler shutdown protection.

[0003] The traditional cooler protection principle involves using two parallel power supply lines connected to the same busbar as backup power for each other. During normal operation, the two lines are connected to the same busbar, with one line open and the other closed. The line with the closed switch is called the primary power supply, and the line with the open switch is called the backup power supply. When the primary power supply experiences a busbar voltage loss due to a fault or other reason, the system automatically switches on the other power supply after the primary power supply switch trips. After the automatic backup power supply is activated, the backup power supply can be disconnected and the primary power supply switched on when the primary power supply is re-energized, thus achieving a self-recovery function for the primary power supply.

[0004] However, in actual operation, transformer coolers may have the following problems:

[0005] (1) The main power supply is faulty, and the power supply cannot be switched automatically when switching to the backup power supply or the switching fails due to a fault in the contactor component of the backup power supply circuit.

[0006] (2) When both power supplies of the cooler fail, the entire busbar loses voltage because the two incoming lines are connected to the same busbar, causing the cooler to stop completely. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a protection control system, method, device, processor and computer-readable storage medium that supports three power supplies to prevent the cooler from shutting down completely, and has a high degree of intelligence, flexible and reliable protection methods and high power supply reliability.

[0008] To achieve the above objectives, the present invention provides a protection control system, method, apparatus, processor, and computer-readable storage medium supporting three power supplies to prevent a complete shutdown of the cooler, as follows:

[0009] This protection and control system, which supports three power supplies to prevent a complete shutdown of the cooler, is characterized by comprising a first incoming power circuit breaker, a second incoming power circuit breaker, a third incoming power circuit breaker, a first cooler power circuit breaker, multiple sets of cooler power circuit breakers, a first through-core current transformer, a second through-core current transformer, and multiple sets of through-core current transformers for monitoring the cooler current.

[0010] One end of the first incoming power circuit breaker is connected to the first power supply, and the other end is directly connected to the bus. The electric operating mechanism of the first incoming power circuit breaker is connected to the corresponding output terminal of the system, and the status contact of the first incoming power circuit breaker is connected to the corresponding input sampling terminal of the system.

[0011] One end of the second incoming power circuit breaker is connected to the second power supply, and the other end is connected to the busbar. The electric operating mechanism of the second incoming power circuit breaker is connected to the corresponding output terminal of the system, and the status contact of the second incoming power circuit breaker is connected to the corresponding input sampling terminal of the system. The first incoming power circuit breaker and the second incoming power circuit breaker are used to control the operation of the first power supply and the second power supply.

[0012] One end of the third incoming power circuit breaker is connected to the third power supply, and the other end is connected to the first set of cooler power circuit breakers. It is also connected to the busbar through the first cooler power circuit breaker. The electric operating mechanism of the third incoming power circuit breaker is connected to the corresponding output terminal of the system. The status contact of the third incoming power circuit breaker is connected to the corresponding input sampling terminal of the system. The third incoming power circuit breaker is used to control the opening and closing of the third power supply.

[0013] The first cooler power circuit breaker is linked to the third incoming power circuit breaker for switching. One end of the first cooler power circuit breaker is connected to the busbar, and the other end is connected in parallel with the third incoming power circuit breaker to the first group of cooler power circuit breakers. The electric operating mechanism of the first cooler power circuit breaker is connected to the corresponding output terminal of the system, and the status contact of the first cooler power circuit breaker is connected to the corresponding input sampling terminal of the system. The first cooler power circuit breaker is used to control the power selection of the first group of coolers.

[0014] The first and second through-core current transformers are used to monitor the transformer cooling system. The through-core current transformers are used to monitor the cooler current. The multiple sets of cooler power circuit breakers and multiple sets of through-core current transformers for monitoring the cooler current are used for protection and control of each cooler branch.

[0015] Preferably, one end of the first group of cooler power circuit breakers is connected to the parallel connection point of the third incoming power circuit breaker and the first cooler power circuit breaker, and the other end is connected to the first cooler. One end of the other groups of cooler power circuit breakers is connected to the incoming power bus, and the other end is connected to the other coolers.

[0016] Preferably, the system converts the first power supply and the second power supply into sampleable small current signals through the first and second through-core transformers. The three-phase current signal lines on the secondary side of the first and second through-core transformers are connected to the corresponding current sampling terminals of the system. The system monitors the incoming first power supply, the second power supply, and the bus voltage of the transformer cooling system through voltage transformers, and monitors the position status of the molded case circuit breakers of the first and second power supplies through the status contacts of the first and second incoming power supply circuit breakers.

[0017] Preferably, the first incoming power circuit breaker, the second incoming power circuit breaker, the third incoming power circuit breaker, the first cooler power circuit breaker, and the cooler power circuit breaker are molded case circuit breakers with electric operating mechanisms. The electric operating mechanisms use two 220V DC pulse signals as operating commands for opening and closing the circuit breakers.

[0018] Preferably, the system includes a main power supply, which includes a first power supply and a second power supply, and the first power supply and the second power supply are backups for each other. The system also includes a backup power supply, which is a third power supply. The first power supply, the second power supply and the third power supply constitute a main and backup three-stage incoming power supply.

[0019] The protection control method for preventing a complete shutdown of the cooler based on the aforementioned system and supporting three power supplies is characterized by the following steps:

[0020] (1) In the initial state, based on the closing and opening states of the first incoming power circuit breaker, the second incoming power circuit breaker, the third incoming power circuit breaker and the first cooler power circuit breaker, as well as the state of the first incoming power supply with bus, the current state and power supply fault state are detected, and the power supply operation is controlled.

[0021] (2) When the third incoming power supply is running with the busbar, the first power supply and its voltage are checked for recovery and the fault status of the busbar based on the closing and opening status of the first incoming power supply circuit breaker, the second incoming power supply circuit breaker, the third incoming power supply circuit breaker and the first cooler power supply circuit breaker. The third incoming power supply circuit breaker, the first cooler power supply circuit breaker, the first incoming power supply circuit breaker or the second incoming power supply circuit breaker are then controlled to close or open, and the first power supply or the second power supply is connected to make the cooler power supply circuit breaker run.

[0022] Preferably, step (1) specifically includes the following steps:

[0023] (1.1) If the following conditions are met: the first incoming power circuit breaker is in the closed position, the second incoming power circuit breaker is in the open position, the third incoming power circuit breaker is in the open position, the first cooler power circuit breaker is in the closed position, the first incoming power supply is running with the bus, and the bus is running with a portion of the coolers, then continue to step (1.2).

[0024] If the following conditions are met: the first incoming power circuit breaker is in the open position, the second incoming power circuit breaker is in the closed position, the third incoming power circuit breaker is in the open position, the first cooler power circuit breaker is in the closed position, the second incoming power supply is running with the bus, and the bus is running with a portion of the coolers, then continue to step (1.3).

[0025] (1.2) When the system detects that the first power supply is undervoltage and the current of the first through-core transformer becomes zero, the first power supply is faulty. The system controls the first incoming power supply circuit breaker to open, disconnecting the first incoming power supply, and controls the second incoming power supply circuit breaker to close. The second power supply supplies power to the bus, and the coolers that were originally put into operation under the bus remain energized.

[0026] When the system detects a loss of voltage in the first power supply, the current in the first through-core transformer becomes zero and the second power supply still fails, and the current in the second through-core transformer becomes zero, both the first and second power supplies are faulty. The system controls the first and second incoming power supply circuit breakers to open, disconnecting the first and second incoming power supplies, controlling the first cooler power supply circuit breaker to open and the third incoming power supply circuit breaker to close, and connecting the third power supply. The third power supply only operates one set of cooler power supply circuit breakers.

[0027] When the system detects that the first power supply is energized and the current of the first through-core transformer suddenly increases to the preset value, the bus fault occurs. The system controls the first incoming power circuit breaker to quickly trip, disconnecting the first incoming power supply. The bus loses voltage, and all coolers below the bus stop supplying power. The system controls the first cooler power circuit breaker to trip and the third incoming power circuit breaker to close. The third power supply only drives one set of cooler power circuit breakers.

[0028] (1.3) When the system detects that the second power supply is undervoltage and the current of the second through-core transformer becomes zero, the second power supply is faulty. The system controls the second incoming power supply circuit breaker to open, disconnects the second incoming power supply, controls the first incoming power supply circuit breaker to close, and the first power supply supplies power to the bus. The coolers that were originally put into operation under the bus remain energized.

[0029] When the system detects a loss of voltage in the second power supply, the current in the second current transformer becomes zero and the first power supply still fails to provide voltage, and the current in the first current transformer becomes zero, then both the first and second power supplies are faulty. The system controls the first and second incoming power circuit breakers to open, disconnecting the first and second incoming power supplies, controls the first cooler power circuit breaker to open, and the third incoming power circuit breaker to close, connecting the third power supply. The third power supply only powers one set of cooler power circuit breakers.

[0030] When the system detects that the second power supply is energized and the current of the second current transformer suddenly increases to the preset value, the busbar is faulty. The system controls the second incoming power supply circuit breaker to quickly trip, disconnecting the second incoming power supply. The busbar loses voltage, and all coolers below the busbar stop receiving power. The system controls the first cooler power supply circuit breaker to trip and the third incoming power supply circuit breaker to close. The third power supply only powers one set of cooler power supply circuit breakers.

[0031] Preferably, step (2) specifically includes the following steps:

[0032] (2.1) If the following conditions are met when the third power supply of the incoming line is running with the busbar, the first incoming power supply circuit breaker is in the open position, the second incoming power supply circuit breaker is in the open position, the third incoming power supply circuit breaker is in the closed position, and the first cooler power supply circuit breaker is in the open position, then continue to step (2.2).

[0033] (2.2) When the system detects that the first power supply voltage has recovered and the bus has not experienced a fault, the system controls the third incoming power supply circuit breaker to open and the first cooler power supply circuit breaker to close. The first incoming power supply circuit breaker is closed, the first power supply is connected, and the bus runs with the originally connected cooler power supply circuit breaker, restoring to the initial state.

[0034] When the system detects that the second power supply voltage has recovered and no fault has occurred on the bus, the system controls the third incoming power circuit breaker to open, the first cooler power circuit breaker to close, and controls the second incoming power circuit breaker to close, putting the second incoming power supply into operation. The bus then operates with the previously activated cooler power circuit breaker, restoring it to its initial state.

[0035] The device for implementing protective control to prevent a complete shutdown of the cooler while supporting three power supplies is characterized in that the device comprises:

[0036] A processor is configured to execute computer-executable instructions;

[0037] The memory stores one or more computer-executable instructions, which, when executed by the processor, implement the steps of the above-described protection control method for preventing a complete shutdown of the cooler by supporting three power supplies.

[0038] The processor used to implement protection control to prevent the cooler from shutting down completely when supporting three power supplies is characterized in that the processor is configured to execute computer-executable instructions, which, when executed by the processor, implement the various steps of the above-described protection control method for preventing the cooler from shutting down completely when supporting three power supplies.

[0039] The computer-readable storage medium is characterized in that it stores a computer program thereon, which can be executed by a processor to implement the various steps of the above-described protection control method for preventing the cooler from shutting down completely and supporting three power supplies.

[0040] The present invention employs a protection control system, method, apparatus, processor, and computer-readable storage medium that supports three power supplies to prevent a complete shutdown of the cooler. By introducing a third power supply, when both incoming power supplies fail, a third backup power supply is activated to provide backup power for the control circuit to continue operation. This improves the reliability and flexibility of power supply, effectively avoids a complete shutdown of the cooler, and prevents the transformer oil temperature from rising abnormally due to cooling system failure, thus preventing a larger operational accident. Attached Figure Description

[0041] Figure 1 This is the main wiring diagram for an existing air-cooled system.

[0042] Figure 2 This is the main wiring diagram of the protection control system of the present invention, which supports three power supplies to prevent the cooler from shutting down completely. Detailed Implementation

[0043] To more clearly describe the technical content of the present invention, the following description is provided in conjunction with specific embodiments.

[0044] The present invention provides a protection and control system that supports three power supplies to prevent a complete shutdown of the cooler, comprising a first incoming power circuit breaker CB1, a second incoming power circuit breaker CB2, a third incoming power circuit breaker Q3, a first cooler power circuit breaker Q4, multiple cooler power circuit breakers CB11-CB81, a first through-core current transformer CT1, a second through-core current transformer CT2, and multiple through-core current transformers CT11-CT82 for monitoring the cooler current.

[0045] One end of the first incoming power circuit breaker CB1 is connected to the first power source, and the other end is directly connected to the bus. The electric operating mechanism of the first incoming power circuit breaker CB1 is connected to the corresponding output terminal of the system, and the status contact of the first incoming power circuit breaker CB1 is connected to the corresponding input sampling terminal of the system.

[0046] One end of the second incoming power circuit breaker CB2 is connected to the second power supply, and the other end is connected to the busbar. The electric operating mechanism of the second incoming power circuit breaker CB2 is connected to the corresponding output terminal of the system, and the status contact of the second incoming power circuit breaker CB2 is connected to the corresponding input sampling terminal of the system. The first incoming power circuit breaker CB1 and the second incoming power circuit breaker CB2 are used to control the operation of the first power supply and the second power supply.

[0047] One end of the third incoming power circuit breaker Q3 is connected to the third power supply, and the other end is connected to the first set of cooler power circuit breakers. It is also connected to the busbar through the first cooler power circuit breaker Q4. The electric operating mechanism of the third incoming power circuit breaker Q3 is connected to the corresponding output terminal of the system, and the status contact of the third incoming power circuit breaker Q3 is connected to the corresponding input sampling terminal of the system. The third incoming power circuit breaker Q3 is used to control the opening and closing of the third power supply.

[0048] The first cooler power circuit breaker is linked to the third incoming power circuit breaker for switching. One end of the first cooler power circuit breaker Q4 is connected to the bus, and the other end is connected in parallel with the third incoming power circuit breaker Q3 to the first group of cooler power circuit breakers. The electric operating mechanism of the first cooler power circuit breaker Q4 is connected to the corresponding output terminal of the system, and the status contact of the first cooler power circuit breaker Q4 is connected to the corresponding input sampling terminal of the system. The first cooler power circuit breaker Q4 is used to control the power selection of the first group of coolers.

[0049] The first through-core transformer CT1 and the second through-core transformer CT2 are used to monitor the transformer cooling system. The through-core transformers are used to monitor the cooler current. The multiple sets of cooler power circuit breakers and multiple sets of through-core transformers CT11 to CT82 for monitoring the cooler current are used for protection and control of each cooler branch.

[0050] In a preferred embodiment of the present invention, one end of the first group of cooler power circuit breakers CB11 is connected to the parallel connection point of the third incoming power circuit breaker Q3 and the first cooler power circuit breaker Q4, and the other end is connected to the first cooler. One end of the other groups of cooler power circuit breakers is connected to the incoming power bus, and the other end is connected to the other coolers.

[0051] The three-phase power supply line of the oil pump of the first cooler passes through the first set of through-core current transformers CT11. The secondary side three-phase current signal line of the first set of through-core current transformers CT11 is connected to the corresponding current sampling terminal of the system. The same applies to CT21 to CT81, and so on.

[0052] The three-phase power supply line of the fan of the first cooler passes through the second set of through-core current transformers CT12. The secondary side three-phase current signal line of the second set of through-core current transformers CT12 is connected to the corresponding current sampling terminal of the system. The same applies to CT22 to CT82, and so on.

[0053] In a preferred embodiment of the present invention, the system converts the first power supply and the second power supply into sampleable small current signals through the first through-core transformer CT1 and the second through-core transformer CT2. The secondary side three-phase current signal lines of the first through-core transformer CT1 and the second through-core transformer CT2 are connected to the corresponding current sampling terminals of the system. The system monitors the incoming first power supply, the second power supply and the bus voltage of the transformer cooling system through voltage transformers, and monitors the position status of the molded case circuit breakers of the first power supply and the second power supply through the status contacts of the first incoming power circuit breaker CB1 and the second incoming power circuit breaker CB2.

[0054] In a preferred embodiment of the present invention, the first incoming power circuit breaker CB1, the second incoming power circuit breaker CB2, the third incoming power circuit breaker Q3, the first cooler power circuit breaker Q4, and the cooler power circuit breakers CB11 to CB81 are molded case circuit breakers with electric operating mechanisms. The electric operating mechanisms use two 220V DC pulse signals as operating commands for opening and closing the circuit breakers.

[0055] In a preferred embodiment of the present invention, the system includes a main power supply, which includes a first power supply and a second power supply, and the first power supply and the second power supply are backups for each other. The system also includes a backup power supply, which is a third power supply. The first power supply, the second power supply and the third power supply constitute a main and backup three-stage incoming power supply.

[0056] The present invention provides a protection control method for preventing a complete shutdown of the cooler based on the aforementioned system, wherein the method includes the following steps:

[0057] (1) In the initial state, based on the closing and opening states of the first incoming power circuit breaker, the second incoming power circuit breaker, the third incoming power circuit breaker and the first cooler power circuit breaker, as well as the state of the first incoming power supply with bus, the current state and power supply fault state are detected, and the power supply operation is controlled.

[0058] (2) When the third incoming power supply is running with the busbar, the first power supply and its voltage are checked for recovery and the fault status of the busbar based on the closing and opening status of the first incoming power supply circuit breaker, the second incoming power supply circuit breaker, the third incoming power supply circuit breaker and the first cooler power supply circuit breaker. The third incoming power supply circuit breaker, the first cooler power supply circuit breaker, the first incoming power supply circuit breaker or the second incoming power supply circuit breaker are then controlled to close or open, and the first power supply or the second power supply is connected to make the cooler power supply circuit breaker run.

[0059] In a preferred embodiment of the present invention, step (1) specifically includes the following steps:

[0060] (1.1) If the following conditions are met: the first incoming power circuit breaker CB1 is in the closed position, the second incoming power circuit breaker CB2 is in the open position, the third incoming power circuit breaker Q3 is in the open position, the first cooler power circuit breaker Q4 is in the closed position, the first incoming power supply is running with the bus, and the bus is running with a part of the cooler, then continue to step (1.2).

[0061] If the following conditions are met: the first incoming power circuit breaker CB1 is in the open position, the second incoming power circuit breaker CB2 is in the closed position, the third incoming power circuit breaker Q3 is in the open position, the first cooler power circuit breaker Q4 is in the closed position, the second incoming power supply is running with the bus, and the bus is running with a portion of the coolers, then continue to step (1.3).

[0062] (1.2) When the system detects that the first power supply is lost and the current of the first through-core transformer CT1 becomes zero, the first power supply is faulty. The system controls the first incoming power circuit breaker CB1 to open, disconnecting the first incoming power supply, and controls the second incoming power circuit breaker CB2 to close, so that the second power supply supplies power to the bus. The coolers that were originally put into operation under the bus remain energized.

[0063] When the system detects a loss of voltage in the first power supply, the current of the first through-core transformer CT1 becomes zero and the second power supply still fails to provide voltage, and the current of the second through-core transformer CT2 becomes zero, both the first and second power supplies are faulty. The system controls the first incoming power circuit breaker CB1 and the second incoming power circuit breaker CB2 to open, disconnecting the first and second incoming power supplies. It also controls the first cooler power circuit breaker Q4 to open and the third incoming power circuit breaker Q3 to close, putting the third power supply into operation. The third power supply only powers one set of cooler power circuit breakers.

[0064] When the system detects that the first power supply is energized and the current of the first current transformer CT1 suddenly increases to the preset value, the busbar is faulty. The system controls the first incoming power circuit breaker CB1 to quickly trip, disconnecting the first incoming power supply. The busbar loses voltage, and all coolers below the busbar stop receiving power. The system controls the first cooler power circuit breaker Q4 to trip and the third incoming power circuit breaker Q3 to close. The third power supply only drives one set of cooler power circuit breakers.

[0065] (1.3) When the system detects that the second power supply is undervoltage and the current of the second through-core transformer CT2 becomes zero, the second power supply is faulty. The system controls the second incoming power supply circuit breaker CB2 to open, disconnecting the second incoming power supply, and controls the first incoming power supply circuit breaker CB1 to close. The first power supply supplies power to the bus, and the coolers that were originally put into operation under the bus remain energized.

[0066] When the system detects a loss of voltage in the second power supply, the current of the second through-core transformer CT2 becomes zero and the first power supply still fails to provide voltage, and the current of the first through-core transformer CT1 becomes zero, then both the first and second power supplies are faulty. The system controls the first incoming power circuit breaker CB1 and the second incoming power circuit breaker CB2 to open, disconnecting the first and second incoming power supplies. It also controls the first cooler power circuit breaker Q4 to open and the third incoming power circuit breaker Q3 to close, thus connecting the third power supply. The third power supply only powers one set of cooler power circuit breakers.

[0067] When the system detects that the second power supply is energized and the current of the second current transformer CT2 suddenly increases to the preset value, a bus fault occurs. The system controls the second incoming power circuit breaker CB2 to trip quickly, disconnecting the second incoming power supply. The bus loses voltage, and all coolers below the bus stop receiving power. The system controls the first cooler power circuit breaker Q4 to trip and the third incoming power circuit breaker Q3 to close. The third power supply operates with only one set of cooler power circuit breakers.

[0068] In a preferred embodiment of the present invention, step (2) specifically includes the following steps:

[0069] (2.1) If the following conditions are met when the third power supply of the incoming line is running with the busbar, the first incoming power supply circuit breaker CB1 is in the open position, the second incoming power supply circuit breaker CB2 is in the open position, the third incoming power supply circuit breaker Q3 is in the closed position, and the first cooler power supply circuit breaker Q4 is in the open position, then continue to step (2.2).

[0070] (2.2) When the system detects that the first power supply voltage has recovered and the bus has not experienced a fault, the system controls the third incoming power supply circuit breaker Q3 to open and the first cooler power supply circuit breaker Q4 to close, and closes the first incoming power supply circuit breaker CB1 to put the first power supply into the line. The bus runs with the originally put-in cooler power supply circuit breaker and returns to the initial state.

[0071] When the system detects that the second power supply voltage has recovered and no fault has occurred on the bus, the system controls the third incoming power circuit breaker Q3 to open, the first cooler power circuit breaker Q4 to close, and controls the second incoming power circuit breaker CB2 to close, thus putting the second power supply into operation. The bus then operates with the previously activated cooler power circuit breaker, restoring it to its initial state.

[0072] The present invention relates to a device for implementing protective control to prevent a complete shutdown of a cooler supporting three power supplies, wherein the device comprises:

[0073] A processor is configured to execute computer-executable instructions;

[0074] The memory stores one or more computer-executable instructions, which, when executed by the processor, implement the steps of the above-described protection control method for preventing a complete shutdown of the cooler by supporting three power supplies.

[0075] The present invention discloses a processor for implementing protection control to prevent a complete shutdown of the cooler supporting three power supplies, wherein the processor is configured to execute computer-executable instructions, which, when executed by the processor, implement the various steps of the above-described method for implementing protection control to prevent a complete shutdown of the cooler supporting three power supplies.

[0076] The computer-readable storage medium of the present invention stores a computer program that can be executed by a processor to implement the various steps of the above-described protection control method for preventing the cooler from shutting down completely and supporting three power supplies.

[0077] In a specific embodiment of the present invention, the shortcomings of existing power supply devices are overcome, and a protection and control device supporting three power supplies to prevent a complete cooler shutdown is provided. By introducing a third backup power supply and using current transformers to comprehensively monitor the operating conditions of the first and second incoming power lines, the device automatically disconnects the faulty power supply and switches to the second power supply when the first incoming power supply fails. When both the first and second incoming power supplies fail, the device disconnects the faulty bus from the system and connects to the third backup power supply to provide backup power for the control circuit to continue operation. This ensures that a complete cooler shutdown does not occur in the event of a failure of the two main incoming power supplies, preventing a complete cooler shutdown accident and preventing the power outage from spreading. The present invention requires less equipment, has a high degree of intelligence, offers flexible and reliable protection methods, and provides high power supply reliability.

[0078] like Figure 2 As shown, a protection control device for preventing a complete shutdown of the cooler that supports three power supplies is characterized in that the system includes:

[0079] The system includes a first incoming power circuit breaker CB1, a second incoming power circuit breaker CB2, a third incoming power circuit breaker Q3, a first cooler power circuit breaker Q4 that is switched in conjunction with the third incoming power circuit breaker Q3, cooler power circuit breakers CB11 to CB81, a first through-core transformer CT1 and a second through-core transformer CT2 used to monitor the two incoming currents of the transformer cooling system, and through-core transformers CT11 to CT82 used to monitor the cooler current.

[0080] One end of CB11 is connected to the parallel connection point of the third incoming power circuit breaker Q3 and the first cooler power circuit breaker Q4, and the other end is connected to cooler #1.

[0081] One end of CB21 is connected to the incoming power bus, and the other end is connected to cooler #2. CB31 to CB81 are connected similarly, and so on.

[0082] The three-phase power supply line of the oil pump for cooler #1 passes through the coil of CT11, and the three-phase current signal line on the secondary side of CT11 is connected to the corresponding current sampling terminal of the system. The same applies to CT21 to CT81, and so on.

[0083] The three-phase power supply line of the fan of cooler #1 passes through CT12, and the three-phase current signal line on the secondary side of CT12 is connected to the corresponding current sampling terminal of the system. The same applies to CT22 to CT82, and so on.

[0084] Among them, the first incoming power circuit breaker CB1, the second incoming power circuit breaker CB2, the third incoming power circuit breaker Q3, the first cooler power circuit breaker Q4, and the cooler power circuit breakers CB11 to CB81 are molded case circuit breakers equipped with electric operating mechanisms. Their electric operating mechanisms use two 220V DC pulse signals as the operation commands for opening and closing the circuit breakers. The circuit breakers themselves also have basic protection functions such as short-circuit tripping and thermal overload tripping, and can automatically trip to protect the cooling system according to a certain fault current magnitude.

[0085] The first incoming power circuit breaker CB1 and the second incoming power circuit breaker CB2 are used to control the operation of the first and second incoming power supplies. The third incoming power circuit breaker Q3 is used to control the operation of the third power supply. The first cooler power circuit breaker Q4 is used to control the power selection of the first group of coolers. All four circuit breakers simultaneously serve as fault isolation and protection functions for the power supply and busbars.

[0086] Among them, one end of the first incoming power circuit breaker CB1 is connected to the first power supply, and the other end is directly connected to the bus. The electric operating mechanism of the first incoming power circuit breaker CB1 is connected to the corresponding output terminal of the device, and the status contact of the first incoming power circuit breaker CB1 is connected to the corresponding input sampling terminal of the device.

[0087] One end of the second incoming power circuit breaker CB2 is connected to the second power supply, and the other end is connected to the bus. The electric operating mechanism of the second incoming power circuit breaker CB2 is connected to the corresponding output terminal of the device, and the status contact of the second incoming power circuit breaker CB2 is connected to the corresponding input sampling terminal of the device.

[0088] The third incoming power circuit breaker Q3 is connected to the third power supply at one end and to the first set of coolers at the other end. It is connected to the busbar through the first cooler power circuit breaker Q4. The electric operating mechanism of the third incoming power circuit breaker Q3 is connected to the corresponding output terminal of the device, and the status contact of the third incoming power circuit breaker Q3 is connected to the corresponding input sampling terminal of the device.

[0089] One end of the first cooler power circuit breaker Q4 is connected to the bus, and the other end is connected to the first group of coolers in parallel with the third incoming power circuit breaker Q3. The electric operating mechanism of the first cooler power circuit breaker Q4 is connected to the corresponding output terminal of the device, and the status contact of the first cooler power circuit breaker Q4 is connected to the corresponding input sampling terminal of the device.

[0090] The device converts the first and second power supplies into sampleable small current signals through the first through-core transformer CT1 and the second through-core transformer CT2. The three-phase current signal lines on the secondary side of the first through-core transformer CT1 and the second through-core transformer CT2 are connected to the corresponding current sampling terminals of the device. At the same time, the device monitors the first power supply, the second power supply, and the bus voltage of the transformer cooling system through voltage transformers, and monitors the position status of the molded case circuit breakers of the first and second power supplies through the status contacts of the first incoming power supply circuit breaker CB1 to the second incoming power supply circuit breaker CB2, thus comprehensively monitoring the operating status of the power supply equipment of the transformer cooling system.

[0091] Meanwhile, the device of the present invention includes circuit breakers CB11 to CB81 with electric operating mechanism and current transformers CT11 to CT82 for monitoring cooler current for protection and control of each cooler branch. The device automatically switches the cooler group and monitors and protects the cooler fan and oil pump in real time by monitoring the real-time operating status of the transformer and cooler.

[0092] The main power supply of the control device consists of a first power supply and a second power supply, with the first power supply and the second power supply serving as backups for each other. Through a power circuit breaker and an introduced third power supply, a main and backup three-stage incoming power supply is formed.

[0093] The control device supports three power supplies, which improves the reliability and flexibility of power supply and effectively avoids the occurrence of a complete shutdown of the cooler.

[0094] The present invention provides a protection control method for preventing a complete shutdown of the cooler based on the above-mentioned system supporting three power supplies, comprising the following steps:

[0095] Step 1:

[0096] (1.1) In the initial state, the first incoming power circuit breaker CB1 is in the closed position, the second incoming power circuit breaker CB2 is in the open position, the third incoming power circuit breaker Q3 is in the open position, and the first cooler power circuit breaker Q4 is in the closed position. The first incoming power supply is running on the bus, and at this time, the bus is running on a portion of the coolers. When the device detects that the first power supply is undervoltage and the current of the first current transformer CT1 becomes zero, the first power supply is faulty. The device first controls the first incoming power circuit breaker CB1 to open, disconnecting the first incoming power supply, and then controls the second incoming power circuit breaker CB2 to close. At this time, the second power supply supplies power to the bus, and the coolers that were originally in operation on the bus remain energized.

[0097] (1.2) In the initial state, the first incoming power circuit breaker CB1 is in the open position, the second incoming power circuit breaker CB2 is in the closed position, the third incoming power circuit breaker Q3 is in the open position, and the first cooler power circuit breaker Q4 is in the closed position. The second incoming power supply is running on the bus, and at this time, the bus is running on a portion of the coolers. When the device detects that the second power supply is undervoltage and the current of the second current transformer CT2 becomes zero, the second power supply is faulty. The device first controls the second incoming power circuit breaker CB2 to open, disconnecting the second incoming power supply, and then controls the first incoming power circuit breaker CB1 to close. At this time, the first power supply supplies power to the bus, and the coolers that were originally in operation on the bus remain energized.

[0098] (1.3) In the initial state, the first incoming power circuit breaker CB1 is in the closed position, the second incoming power circuit breaker CB2 is in the open position, the third incoming power circuit breaker Q3 is in the open position, and the first cooler power circuit breaker Q4 is in the closed position. The first incoming power supply is running with the busbar, and at this time, the busbar is running with a portion of the coolers. When the device detects that the first power supply is undervoltage, the current of the first through-core transformer CT1 becomes zero and the second power supply is still undervoltage, and the current of the second through-core transformer CT2 becomes zero, then both the first and second power supplies are faulty. The device first controls the first incoming power circuit breaker CB1 and the second incoming power circuit breaker CB2 to open, disconnecting the first and second incoming power supplies. Then, it controls the first cooler power circuit breaker Q4 to open and the third incoming power circuit breaker Q3 to close, connecting the third power supply. At this time, the third power supply only runs with one set of coolers.

[0099] (1.4) In the initial state, the first incoming power circuit breaker CB1 is in the open position, the second incoming power circuit breaker CB2 is in the closed position, the third incoming power circuit breaker Q3 is in the open position, and the first cooler power circuit breaker Q4 is in the closed position. The second incoming power supply is running with the busbar, and at this time, the busbar is running with a portion of the coolers. When the device detects that the second power supply is undervoltage, the current of the second through-core transformer CT2 becomes zero and the first power supply is still undervoltage, and the current of the first through-core transformer CT1 becomes zero, then both the first and second power supplies are faulty. The device first controls the first incoming power circuit breaker CB1 and the second incoming power circuit breaker CB2 to open, disconnecting the first and second incoming power supplies. Then, it controls the first cooler power circuit breaker Q4 to open and the third incoming power circuit breaker Q3 to close, connecting the third power supply. At this time, the third power supply only runs with one set of coolers.

[0100] (1.5) In the initial state, the first incoming power circuit breaker CB1 is in the closed position, the second incoming power circuit breaker CB2 is in the open position, the third incoming power circuit breaker Q3 is in the open position, and the first cooler power circuit breaker Q4 is in the closed position. The first incoming power supply is running with the busbar, and at this time, the busbar is running with a portion of the coolers. When the device detects that the first power supply is energized and the current of the first current transformer CT1 suddenly increases to the preset value, the busbar is faulty. The device controls the first incoming power circuit breaker CB1 to quickly open, disconnecting the first incoming power supply. The busbar loses voltage, and all coolers below the busbar stop receiving power. At this time, the device controls the first cooler power circuit breaker Q4 to open and the third incoming power circuit breaker Q3 to close. The third power supply is running with only one set of coolers.

[0101] (1.6) In the initial state, the first incoming power circuit breaker CB1 is in the open position, the second incoming power circuit breaker CB2 is in the closed position, the third incoming power circuit breaker Q3 is in the open position, and the first cooler power circuit breaker Q4 is in the closed position. The second incoming power supply is running on the bus, and at this time, the bus is running on a portion of the coolers. When the device detects that the second power supply is energized and the current of the second current transformer CT2 suddenly increases to the preset value, the bus fault occurs. The device controls the second incoming power circuit breaker CB2 to quickly open, disconnecting the second incoming power supply. The bus loses voltage, and all coolers below the bus stop receiving power. At this time, the device controls the first cooler power circuit breaker Q4 to open and the third incoming power circuit breaker Q3 to close. The third power supply only runs on one set of coolers.

[0102] Step 2:

[0103] (2.1) When the third incoming power supply is running with the busbar, the first incoming power supply circuit breaker CB1 is in the open position, the second incoming power supply circuit breaker CB2 is in the open position, the third incoming power supply circuit breaker Q3 is in the closed position, and the first cooler power supply circuit breaker Q4 is in the open position. If the device detects that the first power supply voltage has recovered and the busbar has not experienced a fault, the device controls the third incoming power supply circuit breaker Q3 to open and the first cooler power supply circuit breaker Q4 to close. Then, the first incoming power supply circuit breaker CB1 is closed to put the first incoming power supply into operation. At this time, the first incoming power supply is put into operation, and the busbar runs with the previously put-in cooler, restoring to the initial state.

[0104] (2.2) When the third incoming power supply is running with the busbar, the first incoming power supply circuit breaker CB1 is in the open position, the second incoming power supply circuit breaker CB2 is in the open position, the third incoming power supply circuit breaker Q3 is in the closed position, and the first cooler power supply circuit breaker Q4 is in the open position. If the device detects that the second power supply voltage has recovered and the busbar has not experienced a fault, the device controls the third incoming power supply circuit breaker Q3 to open and the first cooler power supply circuit breaker Q4 to close. Then, it controls the second incoming power supply circuit breaker CB2 to close, putting the second incoming power supply into operation. At this time, the second incoming power supply is put into operation, and the busbar runs with the previously put-in cooler, returning to the initial state.

[0105] This invention discloses a protection and control device that supports three power supplies to prevent a complete cooler shutdown. The device monitors the operating status of the three power supplies in real time. When the main power supply fails, it disconnects the main power supply and switches to the backup power supply. When both the main and backup power supplies fail, or the automatic transfer switch function of two incoming lines fails, it automatically switches to the third power supply to partially power the cooler, thus ensuring the stability of the incoming power supply, effectively reducing the probability of a complete cooler shutdown, and improving the reliability of the cooling system. By introducing a third power supply and automatically controlling the switching of the incoming power supply in case of a fault, this invention ensures the stability of the incoming power supply, thereby effectively reducing the probability of a complete cooler shutdown.

[0106] Compared with the traditional transformer cooling control system, the invention in this case introduces the configuration of a third power supply and the corresponding automatic control method, which overcomes the disadvantage that the bus voltage loss may still cause the cooler to stop completely when the two power supplies are used as backups for each other, and effectively reduces the probability of the cooler stopping completely.

[0107] After the introduction of a third power source, when the first incoming power source fails, it can automatically disconnect the faulty power source and switch to the second power source to continue supplying power. When both incoming power sources lose power or the automatic transfer switch of the two incoming power sources fails, the device automatically disconnects the bus from the system and connects to the third backup power source to continue operating the cooler. This ensures that even if both the main and backup incoming power sources cannot be connected normally, a serious accident of complete cooler shutdown will not occur, thus improving the flexibility and reliability of power supply.

[0108] The introduction of a third backup power supply is not merely a simple extension of the conventional automatic transfer switch logic. It also includes an optimized design scheme for the main circuit of the third power supply operating with a portion of the cooler, a more complex and rigorous state logic judgment algorithm, and a circuit breaker control method closely related to the reasonable switching of operating modes, etc.

[0109] For the specific implementation scheme of this embodiment, please refer to the relevant descriptions in the above embodiments, which will not be repeated here.

[0110] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0111] It should be noted that in the description of this invention, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means at least two.

[0112] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which embodiments of the invention pertain.

[0113] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution device. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0114] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The corresponding program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0115] Furthermore, the functional units in the various embodiments of the present invention can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0116] The storage media mentioned above can be read-only memory, disk, or optical disk, etc.

[0117] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0118] The present invention employs a protection control system, method, apparatus, processor, and computer-readable storage medium that supports three power supplies to prevent a complete shutdown of the cooler. By introducing a third power supply, when both incoming power supplies fail, a third backup power supply is activated to provide backup power for the control circuit to continue operation. This improves the reliability and flexibility of power supply, effectively avoids a complete shutdown of the cooler, and prevents the transformer oil temperature from rising abnormally due to cooling system failure, thus preventing a larger operational accident.

[0119] In this specification, the invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and variations can be made without departing from the spirit and scope of the invention. Therefore, the specification and drawings should be considered illustrative rather than restrictive.

Claims

1. A protection control system supporting three power supplies to prevent a complete shutdown of the cooler, characterized in that, The system includes a first incoming power circuit breaker, a second incoming power circuit breaker, a third incoming power circuit breaker, a first cooler power circuit breaker, multiple sets of cooler power circuit breakers, a first through-core current transformer, a second through-core current transformer, and multiple sets of through-core current transformers for monitoring cooler current. One end of the first incoming power circuit breaker is connected to the first power supply, and the other end is directly connected to the bus. The electric operating mechanism of the first incoming power circuit breaker is connected to the corresponding output terminal of the system, and the status contact of the first incoming power circuit breaker is connected to the corresponding input sampling terminal of the system. One end of the second incoming power circuit breaker is connected to the second power supply, and the other end is connected to the busbar. The electric operating mechanism of the second incoming power circuit breaker is connected to the corresponding output terminal of the system, and the status contact of the second incoming power circuit breaker is connected to the corresponding input sampling terminal of the system. The first incoming power circuit breaker and the second incoming power circuit breaker are used to control the operation of the first power supply and the second power supply. One end of the third incoming power circuit breaker is connected to the third power supply, and the other end is connected to the first set of cooler power circuit breakers. It is also connected to the busbar through the first cooler power circuit breaker. The electric operating mechanism of the third incoming power circuit breaker is connected to the corresponding output terminal of the system. The status contact of the third incoming power circuit breaker is connected to the corresponding input sampling terminal of the system. The third incoming power circuit breaker is used to control the opening and closing of the third power supply. The first cooler power circuit breaker is linked to the third incoming power circuit breaker for switching. One end of the first cooler power circuit breaker is connected to the busbar, and the other end is connected in parallel with the third incoming power circuit breaker to the first group of cooler power circuit breakers. The electric operating mechanism of the first cooler power circuit breaker is connected to the corresponding output terminal of the system, and the status contact of the first cooler power circuit breaker is connected to the corresponding input sampling terminal of the system. The first cooler power circuit breaker is used to control the power selection of the first group of coolers. The first and second through-core current transformers are used to monitor the transformer cooling system. The through-core current transformers are used to monitor the cooler current. The multiple sets of cooler power circuit breakers and multiple sets of through-core current transformers for monitoring the cooler current are used for protection and control of each cooler branch. The system described above provides protection and control to prevent the cooler from shutting down completely, supporting three power supplies. Specifically, it includes the following steps: (1) In the initial state, based on the closing and opening states of the first incoming power circuit breaker, the second incoming power circuit breaker, the third incoming power circuit breaker and the first cooler power circuit breaker, as well as the state of the first incoming power supply with bus, the current state and power supply fault state are detected, and the power supply operation is controlled. (2) When the third incoming power supply is running with the busbar, the first power supply and its voltage are checked and the fault status of the busbar are checked according to the closing and opening status of the first incoming power supply circuit breaker, the second incoming power supply circuit breaker, the third incoming power supply circuit breaker and the first cooler power supply circuit breaker. The third incoming power supply circuit breaker, the first cooler power supply circuit breaker, the first incoming power supply circuit breaker or the second incoming power supply circuit breaker are then closed or opened to connect the first power supply or the second power supply and make the cooler power supply circuit breaker run. Step (1) specifically includes the following steps: (1.1) If the following conditions are met: the first incoming power circuit breaker is in the closed position, the second incoming power circuit breaker is in the open position, the third incoming power circuit breaker is in the open position, the first cooler power circuit breaker is in the closed position, the first incoming power supply is running with the bus, and the bus is running with a portion of the coolers, then continue to step (1.2). If the following conditions are met: the first incoming power circuit breaker is in the open position, the second incoming power circuit breaker is in the closed position, the third incoming power circuit breaker is in the open position, the first cooler power circuit breaker is in the closed position, the second incoming power supply is running with the bus, and the bus is running with a portion of the coolers, then proceed to step (1.3). (1.2) When the system detects that the first power supply is lost and the current of the first through-core transformer becomes zero, the first power supply is faulty. The system controls the first incoming power supply circuit breaker to open, disconnecting the first incoming power supply, and controls the second incoming power supply circuit breaker to close. The second power supply supplies power to the bus, and the coolers that were originally put into operation under the bus remain energized. When the system detects a loss of voltage in the first power supply, the current in the first through-core transformer becomes zero and the second power supply still fails, and the current in the second through-core transformer becomes zero, both the first and second power supplies are faulty. The system controls the first and second incoming power supply circuit breakers to open, disconnecting the first and second incoming power supplies, controlling the first cooler power supply circuit breaker to open and the third incoming power supply circuit breaker to close, and connecting the third power supply. The third power supply only operates one set of cooler power supply circuit breakers. When the system detects that the first power supply is energized and the current of the first through-core transformer suddenly increases to the preset value, the bus fault occurs. The system controls the first incoming power circuit breaker to quickly trip, disconnecting the first incoming power supply. The bus loses voltage, and all coolers below the bus stop supplying power. The system controls the first cooler power circuit breaker to trip and the third incoming power circuit breaker to close. The third power supply only drives one set of cooler power circuit breakers. (1.3) When the system detects that the second power supply is undervoltage and the current of the second through-core transformer becomes zero, the second power supply is faulty. The system controls the second incoming power supply circuit breaker to open, disconnects the second incoming power supply, controls the first incoming power supply circuit breaker to close, and the first power supply supplies power to the bus. The coolers that were originally put into operation on the bus remain energized. When the system detects a loss of voltage in the second power supply, the current in the second current transformer becomes zero and the first power supply still fails to provide voltage, and the current in the first current transformer becomes zero, then both the first and second power supplies are faulty. The system controls the first and second incoming power circuit breakers to open, disconnecting the first and second incoming power supplies, controls the first cooler power circuit breaker to open, and the third incoming power circuit breaker to close, connecting the third power supply. The third power supply only powers one set of cooler power circuit breakers. When the system detects that the second power supply is energized and the current of the second current transformer suddenly increases to the preset value, the busbar is faulty. The system controls the second incoming power supply circuit breaker to quickly trip, disconnecting the second incoming power supply. The busbar loses voltage, and all coolers below the busbar stop receiving power. The system controls the first cooler power supply circuit breaker to trip and the third incoming power supply circuit breaker to close. The third power supply only powers one set of cooler power supply circuit breakers.

2. The protection control system supporting three power supplies to prevent the cooler from completely shutting down, as described in claim 1, is characterized in that... One end of the first group of cooler power circuit breakers is connected to the parallel connection point of the third incoming power circuit breaker and the first cooler power circuit breaker, and the other end is connected to the first cooler. One end of the other group of cooler power circuit breakers is connected to the incoming power bus, and the other end is connected to the other coolers.

3. The protection control system supporting three power supplies to prevent the cooler from completely shutting down, as described in claim 1, is characterized in that... The system converts the first and second power supplies into sampleable small current signals through the first and second through-core transformers. The three-phase current signal lines on the secondary side of the first and second through-core transformers are connected to the corresponding current sampling terminals of the system. The system monitors the incoming first power supply, second power supply, and bus voltage of the transformer cooling system through voltage transformers, and monitors the position status of the molded case circuit breakers of the first and second power supplies through the status contacts of the first and second incoming power supply circuit breakers.

4. The protection control system supporting three power supplies to prevent the cooler from completely shutting down, as described in claim 1, is characterized in that... The first incoming power circuit breaker, the second incoming power circuit breaker, the third incoming power circuit breaker, the first cooler power circuit breaker, and the cooler power circuit breaker are molded case circuit breakers with electric operating mechanisms. The electric operating mechanisms use two 220V DC pulse signals as operating commands for opening and closing the circuit breakers.

5. The protection control system supporting three power supplies to prevent a complete shutdown of the cooler according to claim 1, characterized in that, The system includes a main power supply, which includes a first power supply and a second power supply, and the first power supply and the second power supply are backups for each other. The system also includes a backup power supply, which is a third power supply. The first power supply, the second power supply and the third power supply constitute a main and backup three-stage incoming power supply.

6. A protection control method for preventing a complete shutdown of the cooler by supporting three power supplies, based on the system described in claim 1, characterized in that, The method includes the following steps: (1) In the initial state, based on the closing and opening states of the first incoming power circuit breaker, the second incoming power circuit breaker, the third incoming power circuit breaker and the first cooler power circuit breaker, as well as the state of the first incoming power supply with bus, the current state and power supply fault state are detected, and the power supply operation is controlled. (2) When the third incoming power supply is running with the busbar, the first power supply and its voltage are checked and the busbar fault status is checked based on the closing and opening status of the first incoming power supply circuit breaker, the second incoming power supply circuit breaker, the third incoming power supply circuit breaker and the first cooler power supply circuit breaker. The third incoming power supply circuit breaker, the first cooler power supply circuit breaker, the first incoming power supply circuit breaker or the second incoming power supply circuit breaker are then closed or opened to connect the first power supply or the second power supply and make the cooler power supply circuit breaker run.

7. The protection control method for preventing a complete shutdown of the cooler by supporting three power supplies, as described in claim 6, is characterized in that... Step (1) specifically includes the following steps: (1.1) If the following conditions are met: the first incoming power circuit breaker is in the closed position, the second incoming power circuit breaker is in the open position, the third incoming power circuit breaker is in the open position, the first cooler power circuit breaker is in the closed position, the first incoming power supply is running with the bus, and the bus is running with a portion of the coolers, then continue to step (1.2). If the following conditions are met: the first incoming power circuit breaker is in the open position, the second incoming power circuit breaker is in the closed position, the third incoming power circuit breaker is in the open position, the first cooler power circuit breaker is in the closed position, the second incoming power supply is running with the bus, and the bus is running with a portion of the coolers, then proceed to step (1.3). (1.2) When the system detects that the first power supply is lost and the current of the first through-core transformer becomes zero, the first power supply is faulty. The system controls the first incoming power supply circuit breaker to open, disconnecting the first incoming power supply, and controls the second incoming power supply circuit breaker to close. The second power supply supplies power to the bus, and the coolers that were originally put into operation under the bus remain energized. When the system detects a loss of voltage in the first power supply, the current in the first through-core transformer becomes zero and the second power supply still fails, and the current in the second through-core transformer becomes zero, both the first and second power supplies are faulty. The system controls the first and second incoming power supply circuit breakers to open, disconnecting the first and second incoming power supplies, controlling the first cooler power supply circuit breaker to open and the third incoming power supply circuit breaker to close, and connecting the third power supply. The third power supply only operates one set of cooler power supply circuit breakers. When the system detects that the first power supply is energized and the current of the first through-core transformer suddenly increases to the preset value, the bus fault occurs. The system controls the first incoming power circuit breaker to quickly trip, disconnecting the first incoming power supply. The bus loses voltage, and all coolers below the bus stop supplying power. The system controls the first cooler power circuit breaker to trip and the third incoming power circuit breaker to close. The third power supply only drives one set of cooler power circuit breakers. (1.3) When the system detects that the second power supply is undervoltage and the current of the second through-core transformer becomes zero, the second power supply is faulty. The system controls the second incoming power supply circuit breaker to open, disconnects the second incoming power supply, controls the first incoming power supply circuit breaker to close, and the first power supply supplies power to the bus. The coolers that were originally put into operation on the bus remain energized. When the system detects a loss of voltage in the second power supply, the current in the second current transformer becomes zero and the first power supply still fails to provide voltage, and the current in the first current transformer becomes zero, then both the first and second power supplies are faulty. The system controls the first and second incoming power circuit breakers to open, disconnecting the first and second incoming power supplies, controls the first cooler power circuit breaker to open, and the third incoming power circuit breaker to close, connecting the third power supply. The third power supply only powers one set of cooler power circuit breakers. When the system detects that the second power supply is energized and the current of the second current transformer suddenly increases to the preset value, the busbar is faulty. The system controls the second incoming power supply circuit breaker to quickly trip, disconnecting the second incoming power supply. The busbar loses voltage, and all coolers below the busbar stop receiving power. The system controls the first cooler power supply circuit breaker to trip and the third incoming power supply circuit breaker to close. The third power supply only powers one set of cooler power supply circuit breakers.

8. The protection control method for preventing a complete shutdown of the cooler by supporting three power supplies as described in claim 6, characterized in that, Step (2) specifically includes the following steps: (2.1) If the following conditions are met when the third power supply line is running with the busbar, the first power supply circuit breaker is in the open position, the second power supply circuit breaker is in the open position, the third power supply circuit breaker is in the closed position, and the first cooler power supply circuit breaker is in the open position, then continue to step (2.2). (2.2) When the system detects that the first power supply voltage has recovered and the bus has not experienced a fault, the system controls the third incoming power supply circuit breaker to open and the first cooler power supply circuit breaker to close. The first incoming power supply circuit breaker is closed, the first power supply is connected, and the bus runs with the originally connected cooler power supply circuit breaker, restoring to the initial state. When the system detects that the second power supply voltage has recovered and no fault has occurred on the bus, the system controls the third incoming power circuit breaker to open, the first cooler power circuit breaker to close, and controls the second incoming power circuit breaker to close, putting the second incoming power supply into operation. The bus then operates with the previously activated cooler power circuit breaker, restoring it to its initial state.

9. A device for implementing protective control to prevent a complete shutdown of a cooler supporting three power supplies, characterized in that, The device includes: A processor is configured to execute computer-executable instructions; The memory stores one or more computer-executable instructions, which, when executed by the processor, implement the steps of any one of the protection control methods for preventing a complete shutdown of the cooler that supports three power supplies, as described in any one of claims 6 to 8.

10. A processor for implementing protective control to prevent a complete shutdown of the cooler when supporting three power supplies, characterized in that, The processor is configured to execute computer-executable instructions, which, when executed by the processor, implement the steps of any one of claims 6 to 8 in the protection control method for preventing a complete shutdown of the cooler that supports three power supplies.

11. A computer-readable storage medium, characterized in that, It stores a computer program that can be executed by a processor to implement the steps of any of the claims 6 to 8 to implement the protection control method for preventing the cooler from shutting down completely, which supports three power supplies.

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