A main transformer cooling control system operation control method, system, device and medium

Abstract

The present application relates to the technical field of power equipment cooling control, and particularly relates to a main transformer cooling control system operation control method, system, device and medium, steps are as follows: collecting main transformer live state data and main transformer load current data, and sending to the PLC control cabinet of the main transformer cooling control system; comparing the main transformer live state data and the main transformer load current data with corresponding preset threshold values respectively, when any one is greater than the corresponding preset threshold value, sending a first control instruction, the first control instruction is used to instruct two main pumps to start; monitoring the operation state of the PLC control cabinet, when it is determined that the PLC control cabinet is faulty, sending a second control instruction, the second control instruction is used to instruct the emergency pump air opening to close, so as to start the emergency pump. The present application avoids the limitation of single parameter triggering, and through forming a redundant cooling path independent of the PLC control, ensures that the main transformer can still obtain basic cooling protection when the core control unit fails.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power equipment cooling control, in particular to a main transformer cooling control system operation control method, system, device and medium. BACKGROUND

[0002] The power transformer (referred to as "main transformer") is the core equipment in the power system, and its operation stability directly affects the safety and reliable power supply of the power grid. The main transformer will generate a large amount of heat due to electromagnetic induction, resistance loss, etc. during operation, and if the heat cannot be dissipated in time, the winding temperature will rise, accelerating the insulation aging, and even causing short circuit, burning, etc. Therefore, the efficient operation control of the main transformer cooling system is the key link to ensure the safe operation of the main transformer.

[0003] At present, the mainstream main transformer cooling control system adopts the oil pump forced circulation cooling mode, and adjusts the cooling intensity by controlling the start and stop of the oil pump. In the prior art, the control logic of the cooling system usually relies on a single parameter to trigger the oil pump start, and there is a risk of response lag or misoperation. For example, when the main transformer is in a live but low load state, if only the load current is used as the trigger condition, the cooling may not be timely due to the current not reaching the threshold; on the contrary, if only the live state is relied on to trigger, the oil pump may run invalidly when the main transformer is empty and live, increasing energy consumption and equipment loss.

[0004] At the same time, the core control unit of the existing cooling control system lacks effective redundancy protection mechanism. When the PLC control cabinet fails due to power supply failure, program exception or hardware damage, the cooling system will lose control, the oil pump cannot be started, and the main transformer faces the risk of overheating and burning.

[0005] Therefore, in view of the problems of single trigger logic and insufficient emergency protection of the existing main transformer cooling control system, there is an urgent need for a cooling control method that can comprehensively judge the operation state of the main transformer and has a redundant emergency mechanism to improve the operation stability and fault tolerance ability of the main transformer cooling system. SUMMARY

[0006] The purpose of the present application is to provide a main transformer cooling control system operation control method, system, device and medium to solve the technical problems pointed out in the background.

[0007] The present application is realized by the following technical scheme: a main transformer cooling control system operation control method, applicable to a main transformer cooling control system composed of three oil pumps for each phase, two of which are used as main pumps and one as an emergency pump, and an emergency pump air gap is connected in parallel on the power supply branch of the emergency pump, the method comprising the following steps:

[0008] Collect main transformer electrification state data and main transformer load current data, and send the main transformer electrification state data and the main transformer load current data to a PLC control cabinet of a main transformer cooling control system;

[0009] Compare the main transformer electrification state data and the main transformer load current data with corresponding preset threshold values respectively, and when any of the main transformer electrification state data and the main transformer load current data is greater than the corresponding preset threshold value, send a first control instruction, the first control instruction being used to instruct two main pumps to start;

[0010] The method further comprises monitoring an operation state of the PLC control cabinet, and when it is determined that the PLC control cabinet is faulty, sending a second control instruction, the second control instruction being used to instruct an emergency pump air break to open and close to start the emergency pump.

[0011] According to a preferred embodiment, the main transformer electrification state data is a main transformer low-voltage side PT voltage, and the main transformer load current data is a main transformer high-voltage side CT current.

[0012] The application further provides a main transformer cooling control system operation control system applied to the main transformer cooling control system operation control method described above, and the system comprises:

[0013] A data collection module is configured to collect main transformer electrification state data and main transformer load current data, and send the main transformer electrification state data and the main transformer load current data to a PLC control cabinet of a main transformer cooling control system;

[0014] The PLC control cabinet is configured to compare the main transformer electrification state data and the main transformer load current data with corresponding preset threshold values respectively, and when any of the main transformer electrification state data and the main transformer load current data is greater than the corresponding preset threshold value, send a first control instruction, the first control instruction being used to instruct two main pumps to start;

[0015] A PLC control cabinet monitoring module is configured to monitor an operation state of the PLC control cabinet, and when it is determined that the PLC control cabinet is faulty, send a second control instruction, the second control instruction being used to instruct an emergency pump air break to open and close to start the emergency pump.

[0016] According to a preferred embodiment, each phase oil pump main circuit of the system comprises a circuit breaker Q11, a normally open contact of a contactor KM11, a thermal relay FR11, a first main pump, a normally open contact of a contactor KM12, a thermal relay FR12, a second main pump, a normally open contact of a contactor KM13, a thermal relay FR13, and an emergency pump;

[0017] The incoming line end of the circuit breaker Q11 is connected to three-phase line, and the outgoing line end of the circuit breaker Q11 is divided into four power supply branches, each of which is connected to the normally open contact incoming line end of the contactor KM11, the normally open contact incoming line end of the contactor KM12, the normally open contact incoming line end of the contactor KM13 and the oil pump control loop of each phase. The normally open contact outgoing line end of the contactor KM11 is connected to the incoming line end of the thermal relay FR11, the normally open contact outgoing line end of the contactor KM12 is connected to the incoming line end of the thermal relay FR12, the normally open contact outgoing line end of the contactor KM13 is connected to the incoming line end of the thermal relay FR13, the outgoing line end of the thermal relay FR11 is connected to the incoming line end of the first main pump, the outgoing line end of the thermal relay FR12 is connected to the incoming line end of the second main pump, the outgoing line end of the thermal relay FR13 is connected to the incoming line end of the emergency pump, the outgoing line end of the emergency pump air gap is connected to the upstream of the normally open contact incoming line end of the contactor KM13, and the incoming line end of the emergency pump air gap is connected to the downstream of the outgoing line end of the thermal relay FR13.

[0018] According to a preferred embodiment, each phase oil pump control loop of the system comprises a fuse F11, a relay K11, a control relay K12, a coil of a contactor KM11, a control relay K13, a coil of a contactor KM12, a control relay K14 and a coil of a contactor KM13.

[0019] The outgoing line end of the fuse F11 is divided into four control branches, each of which is connected to the incoming line end of the relay K11, the incoming line end of the control relay K12, the incoming line end of the control relay K13 and the incoming line end of the control relay K14. The outgoing line end of the control relay K12 is connected to the coil incoming line end of the contactor KM11, the outgoing line end of the control relay K13 is connected to the coil incoming line end of the contactor KM12, and the outgoing line end of the control relay K14 is connected to the coil incoming line end of the contactor KM13.

[0020] According to a preferred embodiment, the PLC control cabinet is powered by an AC / DC dual input power supply, which comprises a power conversion module U11, a power conversion module U12, a DC monitoring relay K01, an AC monitoring relay K02, a 24V power monitoring relay K03 and a 24V monitoring relay K04, the incoming line end of the DC monitoring relay K01 is connected to a 220V DC input, the outgoing line end of the DC monitoring relay K01 is connected to the incoming line end of the power conversion module U11, the input 220V DC power is converted into 24V DC power through the power conversion module U11, the outgoing line end of the power conversion module U11 is connected to the incoming line end of the 24V power monitoring relay K03, the incoming line end of the AC monitoring relay K02 is connected to a 220V AC input, the outgoing line end of the AC monitoring relay K02 is connected to the incoming line end of the power conversion module U12, the input 220V AC power is converted into 24V DC power through the power conversion module U12, the outgoing line end of the power conversion module U12 is connected to the incoming line end of the 24V power monitoring relay K04, and the outgoing line ends of the 24V power monitoring relay K03 and the 24V power monitoring relay K04 are connected to the PLC control cabinet.

[0021] According to a preferred embodiment, the alarm loop of the system adopts a dual redundancy configuration.

[0022] According to a preferred embodiment, the alarm loop comprises a network communication alarm loop and a hardwired alarm loop, wherein the network communication alarm loop comprises two Ethernet converters, the signal input end of the Ethernet converter is connected to the signal output end of the system communication module, and the signal output end of the Ethernet converter is connected to the signal input end of the monitoring system.

[0023] The application further provides an electronic device, which comprises a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the main transformer cooling control system operation control method when executing the computer program.

[0024] The application further provides a computer readable storage medium, which stores a computer program, and the computer program implements the main transformer cooling control system operation control method when executed by a processor.

[0025] The technical scheme of the main transformer cooling control system operation control method, system, device and medium provided by the application has at least the following advantages and beneficial effects: (1) by simultaneously collecting the main transformer live state data and load current data, and comparing the two with the preset threshold, when any parameter exceeds the limit, two main pumps are started immediately, which avoids the limitation of single parameter triggering, prevents cooling delay caused by current not reaching the threshold when the main transformer is live but low load, and reduces the invalid operation of the oil pump when the main transformer is live but empty, thereby reducing energy consumption and equipment loss while ensuring the heat dissipation demand of the main transformer; (2) in view of the risk of cooling system failure caused by PLC control cabinet failure, a PLC operation state monitoring mechanism is added, when the PLC control cabinet failure is detected, the emergency pump air gap is forcibly closed by the second control instruction to start the emergency pump, forming a redundant cooling path independent of the PLC control, which ensures that the main transformer can still obtain basic cooling protection when the core control unit fails, and significantly reduces the probability of serious failure such as burning caused by overheating of the main transformer. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A flowchart of the main transformer cooling control system operation control method provided for embodiment 1 of the application is shown in the figure.

[0027] Figure 2 An oil pump main circuit schematic diagram provided for embodiment 3 of the application is shown in the figure.

[0028] Figure 3 An oil pump control circuit schematic diagram provided for embodiment 3 of the application is shown in the figure.

[0029] Figure 4 An AC-DC dual-input power supply schematic diagram provided for embodiment 4 of the application is shown in the figure.

[0030] Figure 5 An alarm circuit schematic diagram provided for embodiment 4 of the application is shown in the figure. DETAILED DESCRIPTION

[0031] To make the purpose, technical scheme and advantages of the embodiments of the application clearer, the technical scheme of the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments of the application. The components of the embodiments of the application described and shown in the drawings can be arranged and designed in various different configurations.

[0032] Embodiment 1

[0033] The embodiment provides a main transformer cooling control system operation control method, which is suitable for a main transformer cooling control system composed of three oil pumps for each phase, two of which are used as main pumps and one of which is used as an emergency pump, and an emergency pump air gap is connected in parallel on the power supply branch of the emergency pump,Figure 1 For the flowchart of the main transformer cooling control system operation control method, see Figure 1 The main transformer cooling control system operation control method includes the following steps:

[0034] Data acquisition:

[0035] The main transformer live state data and the main transformer load current data are collected, and the main transformer live state data and the main transformer load current data are sent to the PLC control cabinet of the main transformer cooling control system. In this embodiment, the main transformer live state data is the main transformer low-voltage side PT voltage, and the main transformer load current data is the main transformer high-voltage side CT current.

[0036] Data comparison:

[0037] The main transformer low-voltage side PT voltage and the main transformer high-voltage side CT current are compared with the corresponding preset threshold values, respectively. When any of the main transformer low-voltage side PT voltage and the main transformer high-voltage side CT current is greater than the corresponding preset threshold value, a first control instruction is sent, and the first control instruction is used to instruct the start of the two main pumps.

[0038] By using the above-mentioned double signal source as the oil pump start criterion, the limitation of single parameter triggering can be effectively avoided, which not only prevents the cooling lag caused by the fact that the main transformer is live but the load is low and the current does not reach the threshold value, but also reduces the invalid operation of the oil pump when the main transformer is live but empty, thereby reducing energy consumption and equipment loss while ensuring the heat dissipation demand of the main transformer.

[0039] PLC operation state monitoring:

[0040] In view of the risk of cooling system failure caused by PLC control cabinet failure, the embodiment adds a PLC operation state monitoring mechanism. When it is determined that the PLC control cabinet fails, a second control instruction is sent, and the second control instruction is used to instruct the opening and closing of the emergency pump to start the emergency pump.

[0041] By forming a redundant cooling path independent of the PLC control, the PLC operation state monitoring mechanism added in this embodiment can ensure that the main transformer can still obtain basic cooling protection when the core control unit fails, thereby significantly reducing the probability of serious failures such as burning caused by overheating of the main transformer.

[0042] Embodiment 2

[0043] Based on the technical solution provided in Embodiment 1, this embodiment provides a main transformer cooling control system operation control system. The system is applied to the main transformer cooling control system operation control method described in Embodiment 1, and the system includes a data acquisition module, a PLC control cabinet, and a PLC control cabinet monitoring module.

[0044] The data acquisition module is used to collect the main transformer's energized status data and load current data, and send these data to the PLC control cabinet of the main transformer cooling control system. The PLC control cabinet compares the main transformer's energized status data and load current data with corresponding preset thresholds. When either the energized status data or the load current data exceeds the preset threshold, a first control command is sent to instruct the two main pumps to start. The PLC control cabinet monitoring module monitors the operating status of the PLC control cabinet. When a fault is detected in the PLC control cabinet, a second control command is sent to instruct the emergency pump circuit breaker to close, thereby starting the emergency pump.

[0045] The functions of each module of the main transformer cooling control system operation control system in this embodiment are the same as those in the embodiment of the main transformer cooling control system operation control method, and the technical effects are the same. Therefore, they will not be repeated here.

[0046] Example 3

[0047] This embodiment, based on the technical solution provided in Embodiment 2, further explains the main circuit and control circuit of the oil pump:

[0048] In this embodiment, see Figure 2 As shown, each phase of the system's main oil pump circuit includes circuit breaker Q11, normally open contact of contactor KM11, thermal relay FR11, first main pump, normally open contact of contactor KM12, thermal relay FR12, second main pump, normally open contact of contactor KM13, thermal relay FR13, and emergency pump.

[0049] See Figure 3 As shown, each phase oil pump control circuit of the system includes fuse F11, relay K11, control relay K12, coil of contactor KM11, control relay K13, coil of contactor KM12, control relay K14, and coil of contactor KM13.

[0050] The circuit breaker Q11 has its input terminal connected to the three-phase lines, and its output terminal branched into four power supply branches. Each power supply branch is connected to the normally open contact input terminals of contactors KM11, KM12, and KM13, as well as the input terminal of fuse F11. In this embodiment, the circuit breaker Q11 acts as the main switch, capable of forcibly disconnecting power in extreme conditions such as circuit short circuits and overcurrents, thus providing cascading protection for the entire oil pump system and reducing the risk of electrical fires.

[0051] In the main circuit, a thermal relay is connected in series on the power supply branch of each oil pump; specifically, the normally open contact outlet end of the contactor KM11 is connected to the inlet end of the thermal relay FR11, the normally open contact outlet end of the contactor KM12 is connected to the inlet end of the thermal relay FR12, and the normally open contact outlet end of the contactor KM13 is connected to the inlet end of the thermal relay FR13; the outlet end of the thermal relay FR11 is connected to the inlet end of the first main pump, the outlet end of the thermal relay FR12 is connected to the inlet end of the second main pump, and the outlet end of the thermal relay FR13 is connected to the inlet end of the emergency pump. Through the arrangement of the thermal relay, the overload and overheating states of the oil pump during operation can be monitored in real time. When the oil pump has an abnormal current or the temperature exceeds the standard, the thermal relay can quickly cut off the circuit to avoid damage to the oil pump due to continuous failure and prolong the service life of the equipment.

[0052] Further, the inlet end of the emergency pump air gap is connected upstream of the normally open contact inlet end of the contactor KM13, and the outlet end of the emergency pump air gap is connected downstream of the outlet end of the thermal relay FR13, forming an emergency starting circuit independent of the contactor control. Therefore, when the PLC control cabinet fails, the emergency pump can be directly started by closing the emergency pump air gap without relying on the action of the contactor KM13, thereby ensuring that the emergency cooling function does not depend on the conventional control logic and further enhancing the redundancy protection capability of the system, providing double protection for the safety of the main transformer when the PLC fails.

[0053] The control circuit realizes total overcurrent protection through the fuse F11 and controls the coils of the contactors corresponding to the three oil pumps through independent control relays; specifically, in this embodiment, the outlet end of the fuse F11 has four control branches, and each control branch is connected to the inlet end of the relay K11, the inlet end of the control relay K12, the inlet end of the control relay K13, and the inlet end of the control relay K14; the outlet end of the control relay K12 is connected to the coil inlet end of the contactor KM11, the outlet end of the control relay K13 is connected to the coil inlet end of the contactor KM12, and the outlet end of the control relay K14 is connected to the coil inlet end of the contactor KM13. Through the above design, the start-stop instruction transmission path of each oil pump is independent of each other, thereby avoiding the influence of a single control circuit failure on other oil pumps. For example, when the relay K12 controlling the first main pump fails, only the control of the main pump is affected, and the second main pump and the emergency pump can still respond normally to the instructions through their respective control branches, ensuring that part of the cooling system is not affected by a single failure point.

[0054] Embodiment 4

[0055] Based on the technical solution provided in Embodiment 3, the power supply and alarm of the system are configured with double redundancy, which is further described as follows:

[0056] Regarding the power supply of the system, in the present embodiment, the PLC control cabinet is powered by an AC / DC dual-input power supply.

[0057] Among them, referring to Figure 4 The AC / DC dual-input power supply includes power conversion module U11, power conversion module U12, DC monitoring relay K01, AC monitoring relay K02, 24V power supply monitoring relay K03, and 24V monitoring relay K04.

[0058] The incoming line end of the DC monitoring relay K01 is connected to the 220V DC input, and the outgoing line end of the DC monitoring relay K01 is connected to the incoming line end of the power conversion module U11. The input 220V DC power is converted to 24V DC power through the power conversion module U11, and the outgoing line end of the power conversion module U11 is connected to the incoming line end of the 24V power supply monitoring relay K03.

[0059] The incoming line end of the AC monitoring relay K02 is connected to the 220V AC input, and the outgoing line end of the AC monitoring relay K02 is connected to the incoming line end of the power conversion module U12. The input 220V AC power is converted to 24V DC power through the power conversion module U12, and the outgoing line end of the power conversion module U12 is connected to the incoming line end of the 24V power supply monitoring relay K04.

[0060] The outgoing line ends of the 24V power supply monitoring relays K03 and K04 are connected to the PLC control cabinet. The above-mentioned dual-input power supply forms two independent power supply links. When one of them is interrupted due to power failure, line fault or power module failure, the other can seamlessly switch to continue power supply, avoiding the overall failure of the PLC control cabinet due to single power failure, and ensuring the continuous operation of the control logic. In addition, in the present embodiment, the DC monitoring relay K01 and the AC monitoring relay K02 respectively monitor the on-off state of the 220V DC and AC input, and the 24V power supply monitoring relays K03 and K04 monitor whether the converted 24V DC output is normal. Through the configuration of the above-mentioned multi-stage relays, the abnormalities of different nodes in the power supply link can be captured in real time, such as input power failure, conversion module failure, output voltage abnormality, etc., providing accurate power supply state feedback for the system, and facilitating timely troubleshooting of power supply problems.

[0061] Regarding the fault alarm of the system, in the present embodiment, the alarm circuit of the system adopts a dual-redundancy configuration, including a network communication alarm circuit and a hard-wired alarm circuit. Network communication alarm and hard-wired alarm belong to different transmission media and are affected by different interference sources, so the dual-redundancy configuration can reduce the overall impact of external interference on the alarm function, and further reduce the risk of information interruption caused by single alarm path failure.

[0062] In the embodiment, referring to Figure 5 As shown in the figure, the network communication alarm loop comprises two Ethernet converters, signal input ends of the Ethernet converters are connected with signal output ends of the system communication module, and signal output ends of the Ethernet converters are connected with signal input ends of the monitoring system, so that when one of the Ethernet converters or the corresponding communication link fails, the other converter can continue to complete the transmission of the alarm signal to the monitoring system; at the same time, the hard-wired alarm loop serves as a physically independent backup path and is independent of the network environment, and can guarantee the effective reporting of core alarm information when the network communication completely fails.

[0063] The embodiment provides an electronic device based on the technical scheme in the embodiment 1, and the electronic device comprises a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and the processor implements the main transformer cooling control system operation control method in the embodiment 1 when executing the computer program.

[0064] Embodiment 6

[0065] The embodiment provides a computer readable storage medium based on the technical scheme in the embodiment 1, and the computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the main transformer cooling control system operation control method in the embodiment 1.

[0066] The above only provides preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for controlling the operation of a main transformer cooling control system, characterized in that, This method is applicable to the main transformer cooling control system consisting of three oil pumps per phase, where two oil pumps are used as main pumps and one oil pump is used as an emergency pump. An emergency pump circuit breaker is connected in parallel on the power supply branch of the emergency pump. The method includes the following steps: Collect the main transformer's energized status data and main transformer load current data, and send the main transformer's energized status data and main transformer load current data to the PLC control cabinet of the main transformer cooling control system; The PLC control cabinet is used to compare the main transformer energized status data and the main transformer load current data with the corresponding preset thresholds respectively. When either the main transformer energized status data or the main transformer load current data is greater than the corresponding preset threshold, a first control command is sent. The first control command is used to instruct the two main pumps to start. The method also includes a PLC control cabinet monitoring module monitoring the operating status of the PLC control cabinet. When a fault is detected in the PLC control cabinet, a second control command is sent. The second control command is used to instruct the emergency pump circuit breaker to close, thereby starting the emergency pump and forming a redundant cooling path independent of the PLC control.

2. The operation control method of the main transformer cooling control system as described in claim 1, characterized in that, The main transformer energized status data is the PT voltage on the low-voltage side of the main transformer, and the main transformer load current data is the CT current on the high-voltage side of the main transformer.

3. A main transformer cooling control system operation control system, characterized in that, The system employs the main transformer cooling control system operation control method as described in any one of claims 1 to 2, and the system includes: The data acquisition module is used to collect the main transformer's energized status data and main transformer load current data, and send the main transformer's energized status data and main transformer load current data to the PLC control cabinet of the main transformer cooling control system. The PLC control cabinet is used to compare the main transformer energized status data and the main transformer load current data with the corresponding preset thresholds respectively. When either the main transformer energized status data or the main transformer load current data is greater than the corresponding preset threshold, a first control command is sent. The first control command is used to instruct the two main pumps to start. The PLC control cabinet monitoring module is used to monitor the operating status of the PLC control cabinet. When a fault is detected in the PLC control cabinet, a second control command is sent. The second control command is used to instruct the emergency pump circuit breaker to close, so as to start the emergency pump and form a redundant cooling path independent of the PLC control.

4. The main transformer cooling control system operation control system as described in claim 3, characterized in that, Each phase of the system's main oil pump circuit includes circuit breaker Q11, normally open contact of contactor KM11, thermal relay FR11, first main pump, normally open contact of contactor KM12, thermal relay FR12, second main pump, normally open contact of contactor KM13, thermal relay FR13, and emergency pump. The circuit breaker Q11 has its input terminal connected to the three-phase line. Its output terminal branches into four power supply branches, each connected to the normally open contact input terminal of contactor KM11, the normally open contact input terminal of contactor KM12, the normally open contact input terminal of contactor KM13, and the oil pump control circuit for each phase. The normally open contact output terminal of contactor KM11 is connected to the input terminal of thermal relay FR11, and the normally open contact output terminal of contactor KM12 is connected to the input terminal of thermal relay FR12. The normally open contact output terminal of the contactor KM13 is connected to the input terminal of the thermal relay FR13. The output terminal of the thermal relay FR11 is connected to the input terminal of the first main pump. The output terminal of the thermal relay FR12 is connected to the input terminal of the second main pump. The output terminal of the thermal relay FR13 is connected to the input terminal of the emergency pump. The input terminal of the emergency pump circuit breaker is connected upstream of the normally open contact input terminal of the contactor KM13, and the output terminal of the emergency pump circuit breaker is connected downstream of the output terminal of the thermal relay FR13.

5. The main transformer cooling control system operation control system as described in claim 4, characterized in that, Each phase of the system's oil pump control circuit includes fuse F11, relay K11, control relay K12, coil of contactor KM11, control relay K13, coil of contactor KM12, control relay K14, and coil of contactor KM13. The output terminal of the fuse F11 is divided into four control branches. Each control branch is connected to the input terminal of relay K11, the input terminal of control relay K12, the input terminal of control relay K13, and the input terminal of control relay K14. The output terminal of control relay K12 is connected to the coil input terminal of contactor KM11, the output terminal of control relay K13 is connected to the coil input terminal of contactor KM12, and the output terminal of control relay K14 is connected to the coil input terminal of contactor KM13.

6. The main transformer cooling control system operation control system as described in claim 5, characterized in that, The PLC control cabinet is powered by a dual AC / DC input power supply, which includes a power conversion module U11, a power conversion module U12, a DC monitoring relay K01, an AC monitoring relay K02, a 24V power monitoring relay K03, and a 24V monitoring relay K04. The input terminal of the DC monitoring relay K01 is connected to a 220V DC input, and the output terminal of the DC monitoring relay K01 is connected to the input terminal of the power conversion module U11. The power conversion module U11 converts the input 220V DC power to 24V DC power. The output terminal of 11 is connected to the input terminal of the 24V power monitoring relay K03. The input terminal of the AC monitoring relay K02 is connected to the 220V AC input. The output terminal of the AC monitoring relay K02 is connected to the input terminal of the power conversion module U12. The power conversion module U12 converts the input 220V AC power into 24V DC power. The output terminal of the power conversion module U12 is connected to the input terminal of the 24V power monitoring relay K04. The output terminals of the 24V power monitoring relay K03 and the 24V power monitoring relay K04 are connected to the PLC control cabinet.

7. The main transformer cooling control system operation control system as described in claim 3, characterized in that, The system's alarm loop adopts a dual-redundancy configuration.

8. The main transformer cooling control system operation control system as described in claim 7, characterized in that, The alarm circuit includes a network communication alarm circuit and a hard-wired alarm circuit. The network communication alarm circuit includes two Ethernet converters. The signal input terminal of the Ethernet converter is connected to the signal output terminal of the system communication module, and the signal output terminal of the Ethernet converter is connected to the signal input terminal of the monitoring system.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the main transformer cooling control system operation control method as described in any one of claims 1 to 2.

10. A computer-readable storage medium, characterized in that, A computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, it implements the main transformer cooling control system operation control method as described in any one of claims 1 to 2.

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