Transformer intelligent monitoring and temperature control protection device

Abstract

The invention belongs to the technical field of transformer intelligent equipment, and particularly relates to a transformer intelligent monitoring and temperature control protection device which comprises a multi-parameter sensing module, a multi-mode communication module, a local intelligent decision module, a man-machine interaction module and a master control MCU. The multi-mode communication module supports 4G, Bluetooth and RS485 three-mode parallel transmission to meet the multi-scene communication requirement, the local intelligent decision-making module achieves data verification, dynamic threshold adjustment and offline protection, and the man-machine interaction module facilitates operation of operation and maintenance personnel. The comprehensive monitoring and intelligent control system has the advantages that the fault pre-judgment capability is improved, it is guaranteed that a power system stably adapts to a complex industrial environment, the intelligent level and operation safety of equipment are improved, the operation and maintenance efficiency and convenience are improved, and a powerful guarantee is provided for stable operation of the transformer.

Description

Technical Field

[0001] The present invention belongs to the technical field of intelligent transformer equipment, specifically a transformer intelligent monitoring and temperature control protection device. Background Art

[0002] Transformers play a crucial role in the field of power transmission and distribution. They are devices that use the principle of electromagnetic induction to change alternating current, mainly composed of coils and iron cores. With the continuous and rapid growth of power demand, as the core equipment of power transmission and transformation, transformers need to be effectively monitored to promptly detect faults, improve the efficiency of the power system, and reduce the cost of the power system.

[0003] Currently, there are the following disadvantages in the monitoring of the operating status of transformers in the existing technology: There are many problems in the current monitoring of the operating status of transformers. The functions of traditional temperature controllers are limited, and they cannot comprehensively monitor the parameters of the transformer body, electrical and environmental parameters, resulting in difficulty in obtaining complete operating data, weak fault prediction ability, affecting the stability of the power system. In terms of communication, it is single and cannot meet the requirements of mobile and distributed scenarios. In complex industrial environments, the communication efficiency is low and the compatibility is poor, and there is no backup transmission mode during faults, which limits the flexibility and scalability of the system. The degree of equipment intelligence is low, the data processing ability is poor, the fan control is simple, the alarm is not clear, and there is a lack of local protection strategies and insufficient security when communication or power supply is abnormal; Therefore, in view of the above problems, a transformer intelligent monitoring and temperature control protection device is proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a transformer intelligent monitoring and temperature control protection device that monitors multiple parameters of a transformer, realizes environmental information monitoring, power information monitoring, and transformer temperature monitoring, and performs automatic control and passive signal output according to the parameters.

[0005] The technical solution adopted by the present invention to solve its technical problems is: The transformer intelligent monitoring and temperature control protection device described in the present invention includes:

[0006] Multi-parameter perception module: Integrating PT100 temperature probes, current transformers, voltage transformers, temperature and humidity sensors, air pressure sensors, and noise sensors, used to synchronously collect the winding temperature of the transformer body, the core temperature, or the internal and external temperatures of oil-immersed transformers, and collect electrical parameters including current, voltage, frequency, and phase angle, as well as environmental parameters including temperature and humidity, air pressure, and noise;

[0007] Multi-mode communication module: Supporting parallel transmission of 4G, Bluetooth, and RS485, encapsulating data in JSON format, and realizing multi-scenario communication in remote, near-field, and industrial sites;

[0008] Local intelligent decision-making module: Containing,

[0009] Data verification unit: It is carried out through the analysis of the smoothness of temperature data, the cross-verification of electrical data, combined with the transformer ratio and transformer model, and the abnormal shielding of environmental data (such as resampling humidity when the air pressure is abnormal), to eliminate invalid data and trigger a fault alarm;

[0010] Dynamic threshold adjustment unit: Dynamically correct the temperature protection threshold according to the environmental humidity. When the relative humidity is between 60%-70%, it is lowered by 1°C, between 70%-80% it is lowered by 3°C, and when it is >80%, it is lowered by 5°C, and at the same time trigger a humidity alarm;

[0011] Offline protection unit: Store the reference thresholds T0 = 80°C, T1 = 100°C, T2 = 120°C, T3 = 130°C, and automatically enable the local protection strategy after a communication interruption or power failure;

[0012] Human-machine interaction module: Display parameters in a carousel through a TFT color screen, with fault information displayed preferentially, and distinguish fault types through a combination of short beeps and long beeps of the buzzer;

[0013] Main control MCU: Electrically connected to the multi-parameter sensing module, multi-mode communication module, local intelligent decision-making module, and human-machine interaction module, used to receive and process the data collected by the multi-parameter sensing module, execute the algorithm logic of the local intelligent decision-making module, and control the operation of the multi-mode communication module and human-machine interaction module.

[0014] Preferably, in the multi-parameter sensing module, the PT100 probes of the dry-type transformer are respectively installed in the pre-set temperature measurement holes of the three-phase line package and outside the iron core, and the leads are protected by magnetic shielding sleeves. The probes of the oil-immersed transformer are respectively placed in the thermometer seats inside the heat-conducting copper tubes and on the inner side of the radiator fins of the fuel tank. The signals collected by the probes are input to the main control MCU through an analog-to-digital conversion circuit.

[0015] Preferably, the multi-mode communication module includes a Beidou positioning unit, which is connected to the 4G module through an SMA interface, and the position information collected by the Beidou positioning unit is remotely reported by the 4G module.

[0016] Preferably, the multi-mode communication module defaults to three-mode parallel transmission. When the 4G network is abnormal, the main control MCU automatically switches to Bluetooth or RS485 transmission, and re-uploads the untransmitted data through the multi-mode communication module.

[0017] Preferably, when the humidity > 80% in the dynamic threshold adjustment unit, the main control MCU synchronously reduces the fan start temperature (default T1 = 100°C), and displays the adjusted threshold through the human-machine interaction module.

[0018] Preferably, after a power failure in the offline protection unit, the main control MCU stores the reference threshold in the built-in EEPROM, and automatically restores the preset protection strategy after power-on.

[0019] Preferably, when the current continuously exceeds twice the set value and the temperature does not increase significantly, the main control MCU prompts an incorrect transformer model setting through the human-machine interaction module; when the voltage phase angle deviates from 120°, the main control MCU prompts a wiring error through the human-machine interaction module.

[0020] Preferably, the human-machine interaction module supports touch control for parameter adjustment, and the main control MCU automatically switches to the fault information interface under abnormal conditions.

[0021] Preferably, the PT100 probe adopts Class A accuracy, three-wire connection, and the output signal is input to the main control MCU through an analog-to-digital conversion circuit to ensure that the temperature acquisition error ≤ ±0.15°C.

[0022] Preferably, the protection strategy is executed by the main control MCU. When the temperature of any phase > T1, the main control MCU starts the fan through a PWM signal; when < T0, the main control MCU controls the fan to turn off; when the temperature > T2, the main control MCU triggers an audible and visual alarm and connects the alarm relay; when the temperature > T3, the main control MCU connects the trip relay and continuously gives an alarm.

[0023] Advantages of the present invention:

[0024] 1. Comprehensive monitoring and accurate prediction: The multi-parameter perception module integrates multiple sensors to comprehensively collect various operating parameters of the transformer, breaking through the limitations of traditional monitoring, providing rich data for judging the operating conditions, significantly improving the fault prediction ability, and ensuring the stability of the power system;

[0025] 2. Flexible communication and strong adaptability: The multi-mode communication module supports parallel transmission of 4G, Bluetooth, and RS485. The data is encapsulated in JSON format to meet diverse communication requirements, with efficient and compatible transmission. When the network is abnormal, the transmission mode is automatically switched, reducing the deployment and maintenance costs, improving the flexibility and scalability of the system, and adapting to complex industrial environments;

[0026] 3. Intelligent decision-making, safe and reliable: The local intelligent decision-making module includes multiple units. Data verification ensures reliable data, and dynamic threshold adjustment makes the protection strategy more adaptable to environmental changes. The offline protection is enabled in a timely manner when communication or power supply is abnormal, improving the intelligent level and operating safety of the equipment;

[0027] 4. Convenient interaction and efficient operation and maintenance: The human-machine interaction module displays through a TFT color screen carousel, gives priority to displaying faults, has a buzzer with differentiated alarms, and supports touch control for parameter adjustment, facilitating the operation and maintenance personnel to quickly obtain information, judge faults, and operate, improving the operation and maintenance efficiency and convenience. Description of the Drawings

[0028] The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0029] Figure 1 is a schematic structural diagram of the intelligent monitoring and temperature control protection device for the transformer of the present invention; Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0031] Specific embodiments are given below.

[0032] Please refer to Figure 1 , the intelligent monitoring and temperature control protection device for the transformer of the present invention includes a multi-parameter perception module: integrating a PT100 temperature probe, a current transformer, a voltage transformer, a temperature and humidity sensor, a pressure sensor and a noise sensor, for synchronously collecting the winding temperature of the transformer body, the core temperature or the internal and external temperatures of an oil-immersed transformer, and collecting electrical parameters including current, voltage, frequency and phase angle, as well as environmental parameters including temperature and humidity, pressure and noise;

[0033] A multi-mode communication module: supporting 4G, Bluetooth, and RS485 three-mode parallel transmission. The 4G device is a Quectel 4G CAT-1 module, which encapsulates data in JSON format to achieve multi-scenario communication in remote, near-field and industrial sites;

[0034] A local intelligent decision-making module: including a data verification unit, which is performed through the analysis of the smoothness of temperature data, the cross-verification of electrical data combined with the transformer ratio and the transformer model, and the abnormal shielding of environmental data (such as resampling humidity when the pressure is abnormal), eliminating invalid data and triggering a fault alarm;

[0035] A dynamic threshold adjustment unit: dynamically correcting the temperature protection threshold according to the environmental humidity. When the relative humidity is between 60% and 70%, it is lowered by 1°C, when it is between 70% and 80%, it is lowered by 3°C, and when it is >80%, it is lowered by 5°C, and a humidity alarm is triggered synchronously;

[0036] An offline protection unit: storing the reference thresholds T0 = 80°C, T1 = 100°C, T2 = 120°C, T3 = 130°C, and automatically enabling the local protection strategy after communication interruption or power failure;

[0037] Human - machine interaction module: The parameters are cyclically displayed on the TFT color screen, and the fault information is preferentially displayed. The combination of short beeps and long beeps of the buzzer is used to distinguish the fault types;

[0038] Main control MCU: Electrically connected to the multi - parameter perception module, multi - mode communication module, local intelligent decision - making module, and human - machine interaction module, it is used to receive and process the data collected by the multi - parameter perception module, execute the algorithm logic of the local intelligent decision - making module, and control the operation of the multi - mode communication module and human - machine interaction module;

[0039] In the multi - parameter perception module, the PT100 probes of the dry - type transformer are respectively installed in the pre - set temperature - measuring holes of the three - phase wire package and outside the iron core, and the leads are protected by magnetic shielding sleeves. The probes of the oil - immersed transformer are respectively placed in the thermometer seats inside the heat - conducting copper tubes and on the inner side of the radiator fins of the fuel tank. The signals collected by the probes are input into the main control MCU through the analog - to - digital conversion circuit;

[0040] The multi - mode communication module includes a Beidou positioning unit, which is connected to the 4G module through an SMA interface. The position information collected by the Beidou positioning unit is remotely reported by the 4G module;

[0041] The multi - mode communication module defaults to three - mode parallel transmission. When the 4G network is abnormal, the main control MCU automatically switches to Bluetooth or RS485 transmission and re - uploads the untransmitted data through the multi - mode communication module;

[0042] When the humidity > 80% in the dynamic threshold adjustment unit, the main control MCU synchronously reduces the fan start temperature (default T1 = 100°C) and displays the adjusted threshold through the human - machine interaction module;

[0043] When powered off in the offline protection unit, the main control MCU stores the reference threshold in the built - in EEPROM and automatically restores the preset protection strategy after power - on;

[0044] When the current continuously exceeds twice the set value and the temperature does not increase significantly in the data verification unit, the main control MCU prompts through the human - machine interaction module that the transformer model setting is incorrect; when the voltage phase angle deviates by 120°, the main control MCU prompts through the human - machine interaction module that the wiring is incorrect;

[0045] The human - machine interaction module supports touch - controlled parameter adjustment. In the abnormal state, the main control MCU automatically switches to the fault information interface;

[0046] The PT100 probe adopts Class A accuracy, three - wire connection, and the output signal is input into the main control MCU through the analog - to - digital conversion circuit to ensure that the temperature acquisition error ≤ ±0.15°C;

[0047] The protection strategy is executed by the master MCU. When the temperature of any phase > T1, the master MCU starts the fan through the PWM signal, and when < T0, the master MCU controls the fan to turn off; when the temperature > T2, the master MCU triggers an audible and visual alarm and connects the alarm relay; when the temperature > T3, the master MCU connects the trip relay and continues to give an alarm.

[0048] Working principle:

[0049] In the data acquisition stage, the multi-parameter sensing module integrates a variety of sensors to comprehensively collect the operation data of the transformer. For dry-type transformers, PT100 probes are respectively installed in the preset temperature measurement holes of the three-phase wire packages and outside the iron core, and the probe leads are protected by magnetic shielding sleeves, which can effectively reduce the interference of the strong magnetic field environment of the transformer on the temperature data acquisition. For oil-immersed transformers, one PT100 probe is placed in the thermometer base inside the heat-conducting copper tube to measure the oil temperature inside the fuel tank, and the other is placed inside the heat dissipation fins of the fuel tank to monitor the temperature outside the fuel tank. At the same time, current transformers (5A / 5mA) and voltage transformers (model ZMPT107-1) collect electrical parameters such as current, voltage, frequency, and phase angle on the low-voltage side of the transformer. The temperature and humidity sensor (model AHT20), barometric pressure sensor (Bosch), and noise sensor are responsible for collecting environmental parameters such as temperature, humidity, barometric pressure, and noise in the operating environment of the transformer; then the analog signals collected by the multi-parameter sensing module are converted into digital signals through the analog-to-digital conversion circuit and input to the master MCU for subsequent processing by the master MCU;

[0050] Then it enters the data processing and decision-making stage. After receiving the data transmitted by the multi-parameter sensing module, the master MCU will preprocess it, perform operations such as filtering and calibration. Filtering can remove noise interference in the data, and calibration improves the accuracy of the data; the data verification unit will strictly verify the validity of the collected data. For temperature data, the method of temperature data smoothness analysis is used, combined with historical data and sensor status, to judge whether the data is reasonable. If the reading of any phase probe is abnormal and an abnormal code is read, a sensor fault alarm will be triggered. For electrical data, through cross-checking, combined with the transformer ratio and transformer model, the validity of the data is judged. When the current continuously exceeds twice the set value and the temperature does not increase significantly, the master MCU prompts an incorrect transformer model setting through the human-machine interaction module; when the voltage phase angle deviates from 120°, a wiring error is prompted. For environmental data, when the barometric pressure value is abnormal (such as barometric pressure < 800hPa or > 1100hPa), the current humidity measurement value will be blocked and resampled to ensure the accuracy and reliability of the data;

[0051] The dynamic threshold adjustment unit dynamically corrects the temperature protection threshold according to the ambient humidity. The main control MCU monitors the data transmitted by the ambient humidity sensor in real time. When the relative humidity is between 60% - 70%, the preset temperature protection threshold is lowered by 1°C; when it is between 70% - 80%, it is lowered by 3°C; when the humidity > 80%, it is lowered by 5°C, and a humidity alarm is triggered synchronously. At the same time, the main control MCU will synchronously lower the fan start temperature (default T1 = 100°C) and display the adjusted threshold through the human - machine interaction module;

[0052] The offline protection unit stores the reference thresholds T0 = 80°C, T1 = 100°C, T2 = 120°C, T3 = 130°C. In the case of communication interruption or power failure, the main control MCU will store these reference thresholds in the built - in EEPROM to prevent data loss. After power - on, the main control MCU will automatically restore the preset protection strategy to ensure that the device can continue to work properly.

[0053] During the data communication stage, the multi - mode communication module supports parallel transmission of 4G, Bluetooth, and RS485. The data is encapsulated in JSON format to achieve multi - scenario communication in remote, near - field, and industrial field scenarios. By default, the parallel transmission mode of the three modes can ensure the reliability and timeliness of data transmission. The main control MCU monitors the communication status in real time. The 4G module is connected to the main control MCU through the UART interface and connected to the 4G suction cup antenna through the SMA interface. When the 4G network is abnormal, the main control MCU will automatically switch to the Bluetooth or RS485 transmission mode and re - upload the untransmitted data through the multi - mode communication module to ensure that the data is not lost. And the multi - mode communication module contains a Beidou positioning unit, which is connected to the 4G module through the SMA interface. The position information collected by the Beidou positioning unit is remotely reported by the 4G module, which is convenient for maintenance personnel to grasp the position of the device in real time.

[0054] During the human - machine interaction stage, the human - machine interaction module displays the operating parameters of the transformer, including temperature, voltage, current, configuration parameters, etc., on the TFT color screen in a carousel manner, with each item displayed for 6 seconds. At the same time, this module supports touch - controlled parameter adjustment. Users can directly adjust the parameters on the color screen. The main control MCU receives the touch signal and updates the corresponding parameters. When the device is in an abnormal state, the main control MCU will automatically switch to the fault information priority display mode and display the fault information to the maintenance personnel in time. At the same time, the buzzer emits a differentiated combination of short beeps and long beeps according to different fault codes, which is convenient for maintenance personnel to quickly judge the fault type according to the sound even when they cannot directly observe the display screen;

[0055] During the protection strategy execution phase, the master MCU monitors the temperature of the transformer in real time. When the temperature of any phase > T1 (default 100°C), the master MCU starts the fan for heat dissipation through the PWM signal; when the temperature is lower than T0 (default 80°C), the master MCU controls the fan to turn off to achieve energy-saving operation. When the temperature > T2 (default 120°C), the master MCU triggers the audible and visual alarm circuit and connects the alarm relay to remind the operation and maintenance personnel to pay attention to the equipment anomaly. When the temperature > T3 (default 130°C), the master MCU connects the trip relay and continuously alarms, cuts off the circuit in time to protect the safety of the transformer equipment and avoid equipment damage caused by high temperature;

[0056] The present invention integrates the temperature of the transformer body, electrical parameters (current, voltage, frequency, phase angle) and environmental parameters (temperature and humidity, air pressure, noise). The master MCU performs data processing and decision-making, greatly expanding the monitoring dimension, achieving all-round and multi-dimensional monitoring of the operating state of the transformer, providing rich data support for accurately judging the operating condition of the transformer and fault warning, and significantly improving the fault prediction ability; The adaptive communication mechanism of the multi-mode communication module can meet the remote management requirements in mobile and distributed scenarios, as well as the complex communication environment requirements in the industrial field. By adopting the JSON format to transmit multi-parameter data, it improves the data transmission efficiency and compatibility, reduces the deployment and maintenance costs, and improves the flexibility and scalability of the system; The local intelligent decision-making module performs real-time verification and cleaning on the multi-source sensor data to ensure the credibility of the data; The dynamic threshold adjustment unit dynamically adjusts the temperature protection threshold according to the environmental humidity, making the protection strategy more targeted and adaptable; The offline protection unit can quickly enable the reference threshold and historical data stored locally when the communication is interrupted or the power is cut off and then powered on again, ensuring the timeliness of the protection action and effectively improving the intelligent level and operating safety of the equipment.

[0057] In the description of this specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0058] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. Transformer intelligent monitoring and temperature control protection device, characterized in that: include: Multi-parameter sensing module: Integrates PT100 temperature probe, current transformer, voltage transformer, temperature and humidity sensor, air pressure sensor and noise sensor to synchronously collect the winding temperature of the transformer body, the core temperature or the internal and external temperature of the oil-immersed transformer, and collect electrical parameters including current, voltage, frequency and phase angle, as well as environmental parameters including temperature, humidity, air pressure and noise; Multi-mode communication module: supports 4G, Bluetooth, and RS485 three-mode parallel transmission, uses JSON format to encapsulate data, and realizes multi-scenario communication in remote, near-field and industrial sites; Local intelligent decision-making module: including, Data verification unit: Through temperature data smoothness analysis, electrical data cross-verification combined with mutual inductor ratio and transformer model, and environmental data abnormality shielding (such as resampling humidity when air pressure is abnormal), invalid data is eliminated and fault alarm is triggered; Dynamic threshold adjustment unit: Dynamically correct the temperature protection threshold according to the ambient humidity. When the relative humidity is between 60% and 70%, it is lowered by 1°C; when it is between 70% and 80%, it is lowered by 3°C; when it is greater than 80%, it is lowered by 5°C, and the humidity alarm is triggered synchronously. Offline protection unit: stores reference thresholds T0 = 80°C, T1 = 100°C, T2 = 120°C, T3 = 130°C, and automatically enables local protection strategies after communication interruption or power failure; Human-computer interaction module: Parameters are displayed in a carousel on the TFT color screen, fault information is displayed first, and the fault type is distinguished by the combination of short and long beeps on the buzzer; Main control MCU: electrically connected to the multi-parameter sensing module, multi-mode communication module, local intelligent decision-making module and human-computer interaction module, used to receive and process the data collected by the multi-parameter sensing module, execute the algorithm logic of the local intelligent decision-making module, and control the operation of the multi-mode communication module and the human-computer interaction module.

2. The transformer intelligent monitoring and temperature control protection device according to claim 1 is characterized in that: In the multi-parameter sensing module, the PT100 probes of the dry-type transformer are respectively installed in the preset temperature measuring holes of the three-phase wire package and the outside of the iron core, and the leads are protected by magnetic shielding sleeves. The probes of the oil-immersed transformer are respectively placed in the thermometer seat in the heat-conducting copper tube and on the inside of the oil tank cooling fins. The signals collected by the probes are input into the main control MCU through the analog-to-digital conversion circuit.

3. The transformer intelligent monitoring and temperature control protection device according to claim 1 is characterized in that: The multi-mode communication module includes a Beidou positioning unit, which is connected to the 4G module via an SMA interface. The location information collected by the Beidou positioning unit is remotely reported by the 4G module.

4. The transformer intelligent monitoring and temperature control protection device according to claim 1 is characterized in that: The multi-mode communication module defaults to three-mode parallel transmission. When the 4G network is abnormal, the main control MCU automatically switches to Bluetooth or RS485 transmission, and re-uploads the untransmitted data through the multi-mode communication module.

5. The transformer intelligent monitoring and temperature control protection device according to claim 1 is characterized in that: When the humidity of the dynamic threshold adjustment unit is greater than 80%, the main control MCU synchronously lowers the fan startup temperature (default T1 = 100° C.) and displays the adjusted threshold through the human-computer interaction module.

6. The transformer intelligent monitoring and temperature control protection device according to claim 1 is characterized in that: After the offline protection unit is powered off, the main control MCU stores the reference threshold in the built-in EEPROM and automatically restores the preset protection strategy after power-on.

7. The transformer intelligent monitoring and temperature control protection device according to claim 1 is characterized in that: When the current of the data verification unit continuously exceeds twice the set value and the temperature does not rise significantly, the main control MCU prompts through the human-computer interaction module that the transformer model is set incorrectly; when the voltage phase angle deviates from 120°, the main control MCU prompts through the human-computer interaction module that the wiring is incorrect.

8. The transformer intelligent monitoring and temperature control protection device according to claim 1 is characterized in that: The human-computer interaction module supports touch-control adjustment parameters, and the main control MCU automatically switches to the fault information interface under abnormal conditions.

9. The transformer intelligent monitoring and temperature control protection device according to claim 2 is characterized in that: The PT100 probe adopts Class A accuracy and three-wire wiring. The output signal is input to the main control MCU through an analog-to-digital conversion circuit to ensure that the temperature acquisition error is ≤±0.15°C.

10. The transformer intelligent monitoring and temperature control protection device according to claim 1, characterized in that: The protection strategy is executed by the main control MCU. When the temperature of any phase is greater than T1, the main control MCU starts the fan through a PWM signal. When the temperature is less than T0, the main control MCU controls the fan to shut down; when the temperature is greater than T2, the main control MCU triggers an audible and visual alarm and connects the alarm relay; when the temperature is greater than T3, the main control MCU connects the tripping relay and continues to alarm.

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