Low-voltage power distribution intelligent internet-of-things system device circuit

Abstract

The invention relates to the technical field of power grid electric power, in particular to a low-voltage power distribution intelligent Internet of Things system device circuit, which comprises a protocol converter unit and a low-voltage power distribution intelligent Internet of Things device unit, and is characterized in that the protocol converter unit comprises a power supply conversion module, a first communication module, a first power line carrier communication module and a first MCU circuit module; the low-voltage power distribution intelligent internet-of-things device unit comprises a current monitoring module, a voltage monitoring module, a smoke sensing module, a temperature and humidity detection circuit module, a power conversion circuit, a liquid crystal display module, a second communication module, a second power line carrier communication module, a 4G communication module, a remote signaling module, a FLASH external expansion circuit module and a second MCU circuit module. The problems that an existing low-voltage power distribution unit area device cannot monitor environment temperature and humidity changes in a transformer room, cannot monitor the smoke condition in the transformer room and cannot give an alarm on fire smoke are solved.

Description

Technical Field

[0001] The present invention relates to the field of power grid technology, and specifically to a low-voltage power distribution smart Internet of Things system device circuit. Background Art

[0002] As we all know, with the rapid development of society, populations are becoming increasingly concentrated. Electricity, as an essential necessity for people's lives, has become a crucial factor in ensuring the normal operation of urban life. As the demand for electricity in densely populated areas grows, the regular supply of electricity requires more support from grid technologies.

[0003] As the power supply system connecting the high-voltage terminals of individual distribution transformers to a group of users, distribution substations significantly impact the power supply of a region and are closely linked to people's lives. Distribution substations are often located in open, remote environments, and their operation is significantly affected by the environment. Weather-related failures often cause widespread power outages, impacting people's lives. Furthermore, unstable current and voltage levels in distribution substations can easily lead to short circuits and failures, compromising the quality and reliability of power supply within the substations. Improving this quality and reliability has become a major concern.

[0004] The existing technology is mainly used to monitor the operating conditions of low-voltage distribution stations, including operating parameters such as voltage, current, power, frequency, electricity, harmonics, and power outages. It can only monitor the electric energy meter data in the transformer room on site, and cannot monitor the electric meters in the bottom cable branch box, meter box, etc. If the transmission is carried out through the GPRS module, the cost of laying the overall network is too high, and it is not suitable for power distribution transformation. It cannot monitor the changes in ambient temperature and humidity in the transformer room, cannot provide moisture-proof warning under high temperature and high humidity, cannot monitor the smoke situation in the transformer room, cannot provide fire smoke alarm, cannot monitor the water immersion situation in the transformer room, cannot provide water ingress alarm, cannot monitor the partial discharge of the transformer in the transformer room, cannot perform partial discharge monitoring, cannot perform carrier communication within the area, collect the electric meter data in the bottom cable branch box, meter box, etc., and manage the electric meter data within the range in the whole range. It cannot realize remote data transmission and platform management, and cannot arbitrarily connect to equipment from different manufacturers for data exchange. Summary of the Invention

[0005] (1) Technical problems solved In view of the shortcomings of the existing technology, the present invention provides a low-voltage power distribution smart Internet of Things system device circuit.

[0006] (2) Technical solution To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a low-voltage power distribution smart Internet of Things system device circuit, comprising a protocol converter unit and a low-voltage power distribution smart Internet of Things device unit, the protocol converter unit comprising a power conversion module, a first communication module, a first power carrier communication module and a first MCU circuit module, the power conversion module being used for system voltage conversion, the first communication module being used for data docking with external equipment, the first power carrier communication module being used for data output, the first MCU circuit module being used for data interaction and control of the entire system operation, the low-voltage power distribution smart Internet of Things device unit comprising a current monitoring module, a voltage monitoring module, a smoke sensing module, a temperature and humidity detection circuit module, a power conversion circuit, a liquid crystal display module, a second communication module, a second power carrier communication module, a 4G communication module, a remote signaling module, a FLASH expansion circuit module, a second MCU circuit module, a water immersion monitoring module and a partial discharge monitoring module.

[0007] In order to facilitate voltage monitoring of the transformer indoor cable, the present invention is improved in that the current monitoring module is used for current monitoring of the transformer indoor cable, and the voltage monitoring module is used for voltage monitoring of the transformer indoor cable.

[0008] In order to facilitate the monitoring of the temperature and humidity of the transformer indoor environment, the present invention has the following improvements: the smoke sensor module is used to monitor the smoke alarm in the transformer indoor environment; and the temperature and humidity monitoring circuit module is used to monitor the temperature and humidity in the transformer indoor environment.

[0009] In order to facilitate communication with external communication modules, the present invention has the following improvements: the liquid crystal display module is used for local liquid crystal display and operation, and the second communication module is used for data collection of electric meters in the transformer room and for communication between external communication modules.

[0010] In order to facilitate the collection and aggregation of data from each sub-meter, the present invention has an improvement in that the second power carrier communication module is used to collect and aggregate data from each sub-meter in the bottom cable branch box and the meter box, and is used for precise positioning.

[0011] In order to facilitate remote monitoring and control, the present invention has been improved in that the 4G communication module is used for data interaction between IoT platforms and can be used for remote monitoring and control.

[0012] In order to facilitate the alarm of local telemetry fault signals, the present invention is improved in that the telemetry module is used to alarm the local telemetry fault signals.

[0013] In order to facilitate data interaction and control of the entire system operation, the present invention has improvements in that the FLASH external expansion circuit module is used for storing and querying data, and the second MCU circuit module is used for data interaction and control of the entire system operation of the low-voltage power distribution smart IoT device unit.

[0014] In order to facilitate confirmation of the waterproof effect, the present invention is improved in that the water immersion monitoring module is used to monitor the water immersion situation in the transformer room to confirm the waterproof effect.

[0015] In order to facilitate monitoring of partial discharge, the present invention has been improved in that the partial discharge monitoring module is used to monitor partial discharge of the transformer in the transformer room to prevent partial discharge from causing discharge.

[0016] (3) Beneficial effects Compared with the prior art, the present invention provides a low-voltage power distribution smart IoT system device circuit, which has the following beneficial effects: The low-voltage power distribution smart IoT system device circuit, the power conversion module is used to convert the system required voltage, the first communication module is used to connect data with equipment from different manufacturers, and is used for all-round access of different equipment types, the first power carrier communication module is used to upload data accessed by equipment types from different manufacturers through power carrier mode, and upload it to the low-voltage power distribution smart IoT device to meet various different application requirements, the current monitoring module and the voltage monitoring module are used to monitor the current, voltage and other data in the transformer room, the smoke sensor module and the temperature and humidity monitoring module are used to monitor the environment in the transformer room, the second power carrier communication module collects bottom data, the remote signaling module collects remote signaling fault information, the partial discharge monitoring module collects partial discharge data, and the water immersion monitoring module collects water immersion status data. All information can be displayed on the local LCD screen and can be exchanged externally through the second communication module, 4G communication module, etc., for remote viewing of data by operating personnel and full-range online monitoring of the boutique substation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a circuit diagram of the first power carrier communication module of the present invention; Figure 2 This is a circuit diagram of the second power carrier communication module of the present invention; Figure 3 This is the circuit diagram of the smoke sensor module of the present invention; Figure 4 This is the circuit diagram of the water immersion monitoring module of the present invention; Figure 5 This is a circuit diagram of a partial discharge monitoring module of the present invention; Figure 6 This is a circuit diagram of a liquid crystal display module according to the present invention; Figure 7 This is the circuit diagram of the remote signaling module of the present invention; Figure 8 This is the circuit diagram of the FLASH external expansion circuit module of the present invention. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] See also Figure 1-8 The present invention is a low-voltage power distribution smart Internet of Things system device circuit, including a protocol converter unit and a low-voltage power distribution smart Internet of Things device unit. The protocol converter unit includes a power conversion module, a first communication module, a first power carrier communication module and a first MCU circuit module. The power conversion module is used for converting system voltage, the first communication module is used for data docking with external equipment, the first power carrier communication module is used for data output, and the first MCU circuit module is used for data interaction and control of the entire system operation. The low-voltage power distribution smart Internet of Things device unit includes a current monitoring module, a voltage monitoring module, a smoke detection module, a temperature and humidity detection circuit module, a power conversion circuit, a liquid crystal display module, a second communication module, a second power carrier communication module, a 4G communication module, a remote signaling module, a FLASH external expansion circuit module, a second MCU circuit module, a water immersion monitoring module and a partial discharge monitoring module.

[0020] In this embodiment, the current monitoring module is used to monitor the current of the indoor cable of the transformer, and the voltage monitoring module is used to monitor the voltage of the indoor cable of the transformer, which facilitates the voltage monitoring of the indoor cable of the transformer.

[0021] In this embodiment, the smoke sensor module is used to monitor the smoke alarm in the transformer room, and the temperature and humidity monitoring circuit module is used to monitor the temperature and humidity of the transformer room environment, which facilitates the monitoring of the temperature and humidity of the transformer room environment.

[0022] In this embodiment, the liquid crystal display module is used for local liquid crystal display and operation, and the second communication module is used for data collection of electric meters in the transformer room and for communication between external communication modules to facilitate communication with external communication modules.

[0023] In this embodiment, the second power carrier communication module is used to collect and summarize data from each sub-meter in the bottom cable branch box and the meter box, and is used for precise positioning to facilitate the collection and summary of data from each sub-meter.

[0024] In this embodiment, the 4G communication module is used for data exchange between IoT platforms and can be used for remote monitoring and control, facilitating remote monitoring and control.

[0025] In this embodiment, the telemetry module is used to alarm the local telemetry fault signal, which facilitates the alarm of the local telemetry fault signal.

[0026] In this embodiment, the FLASH external expansion circuit module is used for storing and querying data, and the second MCU circuit module is used for data interaction and control of the entire system operation of the low-voltage power distribution smart IoT device unit, which facilitates data interaction and control of the entire system operation of the low-voltage power distribution smart IoT device unit.

[0027] In this embodiment, the water immersion monitoring module is used to monitor the water immersion situation in the transformer room and confirm the waterproof effect.

[0028] In this embodiment, the partial discharge monitoring module is used to monitor the partial discharge of the transformer in the transformer room to prevent the partial discharge from causing discharge.

[0029] In summary, the low-voltage power distribution smart IoT system device circuit, when in use, the power conversion module is used to convert the system required voltage, the first communication module is used to connect data with equipment from different manufacturers, and is used for all-round access to different types of equipment, the first power carrier communication module is used to upload data accessed by equipment from different manufacturers through power carrier mode, and upload it to the low-voltage power distribution smart IoT device to meet various application requirements, monitor the current of the transformer indoor cable through the current monitoring module, monitor the voltage of the transformer indoor cable through the voltage monitoring module, monitor the smoke alarm in the transformer indoor through the smoke sensor module, and monitor the temperature and humidity of the transformer indoor environment through the temperature and humidity monitoring circuit module. The second carrier communication module receives Collect bottom data, the remote signaling module collects remote signaling fault information, the partial discharge monitoring module collects partial discharge data, and the flood monitoring module collects flood status data. All information can be displayed on the local LCD screen and can be exchanged externally through the second communication module, 4G communication module, etc., for operation personnel to remotely view data and for full-range online monitoring of boutique substations. The first power carrier communication module is to process the data of different types of equipment from different manufacturers through MCU and transmit it to the low-voltage distribution smart IoT device through carrier communication for data processing. The low-voltage distribution smart IoT device can also send control signals to the power carrier module of the protocol converter through the power carrier communication module circuit to realize the control of equipment of different types of equipment from different manufacturers, such as Figure 1In the middle: R8 is a varistor, which belongs to the power input lightning protection, C15 is a safety capacitor, which filters out the DC component in the power grid, T1 is an AC transformer, which can convert AC 220V into AC5V, C13 is a filter capacitor, which can make the output voltage of T1 more stable, U2MB10S is a rectifier bridge, which can convert AC voltage into DC voltage, among which C13 is a filter capacitor, which makes the DC 5V output more stable, R9 is a current limiting resistor, which separates the transformer ground from the internal circuit ground, The fuse acts as a fuse, D1 and D2 form a double protection tube to discharge the leakage current in the circuit, C8, C12, C10, and C11 are the matching capacitors of U2, C9 and R4, C16 and R7 respectively form a filter circuit to remove the high-frequency component, R5 and R6 form a voltage divider circuit, U2 detects the voltage at pin 11, and can determine whether U2 is in the sending stage or receiving moment. When pin 5 of U2 is high, the data signal is input to the FSK modulator from pin 17 of U2 to form a switch control current And drive the oscillator to generate a triangle wave with a frequency deviation of ±2.2%, and output a sine wave signal through the sine wave shaping circuit, which is then transmitted to the power line by the coupling coil after power amplification. When pin 5 of U2 is ground level, the circuit is in receiving mode. The signal on the power line is input to pin 10 of U2 through the coupling transformer and enters the limiting amplifier for amplification. The DC component and 50Hz / 100Hz industrial frequency signal in the signal are filtered out, and then the phase-locked loop circuit demodulates and the RC filter circuit filters out the high-frequency component to output the data signal. In order to keep the data signal reliable, it is shaped by the comparator and filtered by the noise filter, and finally the complete data signal is output from pin 12. The second power carrier communication module transmits the power quality information of all meters in the cable branch box and meter box to the MCU on the energy controller through carrier communication for data processing. The energy controller can also send control signals to the corresponding power carrier module of the bottom meter through the power carrier communication module circuit to realize control of the meter, such as Figure 2In the middle: R63 is a varistor, which belongs to the power input lightning protection, C37 is a safety capacitor, which filters the DC component in the power grid, T1 is an AC transformer, which can convert AC 220V into AC5V, C36 is a filter capacitor, which can make the voltage at the output of T1 more stable, U2MB10S is a rectifier bridge, which can convert AC voltage into DC voltage, among which C33 is a filter capacitor, which makes the DC 5V output more stable, R64 is a current limiting resistor, which separates the transformer ground from the ground of the internal circuit and acts as a fuse, D11 and D12 form a double protection tube to discharge the leakage current in the circuit, C25, C31, C27, and C30 are matching capacitors for U12, C26 and R59, C62 and R38 respectively form filter The high-frequency component, R60 and R61 form a voltage divider circuit. U12 detects the voltage at pin 11 and can determine whether U12 is in the sending stage or receiving moment. When pin 5 of U12 is high, the data signal is input into the FSK modulator from pin 17 of U12, forming a switch control current and driving the oscillator to generate a triangle wave with a frequency deviation of ±2.2%. The sine wave shaping circuit outputs a sine wave signal, which is then transmitted to the power line by the coupling coil after power amplification. When pin 5 of U12 is ground level, the circuit is in receiving mode. The signal on the power line is input into pin 10 of U12 through the coupling transformer and enters the limiting amplifier for amplification. The DC component and 50Hz / 100Hz power frequency signal in the signal are filtered out and then The data signal is demodulated by the phase-locked loop circuit and filtered out by the RC filter circuit to remove the high-frequency components. In order to keep the data signal reliable, it is shaped by the comparator and filtered by the noise filter. Finally, the complete data signal is output from pin 12. Power line carrier communication uses existing power lines to transmit signals. Its working principle is briefly described as follows: the data is modulated on a carrier frequency of tens to hundreds of kHz and sent out through the power line. The receiving end receives the carrier carrying the signal on the power line and demodulates it to restore the original data. The communication carrier is the existing power line. There is no need to re-lay the communication line like wired communication, nor does it require complex sending and receiving equipment to transmit information like wireless transmission. It does not require the establishment of additional communication lines and does not occupy valuable space. Wireless spectrum resources are available, so it is very suitable for forming a local area network within a small group (usually within the same power transformer room) to achieve the purpose of data or voice transmission (the power line carrier communication module, such as the LM1893, is a power line carrier communication integrated circuit developed by National Semiconductor Devices Corporation of the United States. It integrates all the functions of sending and receiving data and can realize half-duplex communication of serial data. Only a small number of external components are needed to form a complete power line carrier communication system). The smoke sensor module monitors whether there is smoke in the transformer room and plays a fire alarm role. If fire smoke is detected, the smoke alarm information data is transmitted to the MCU and uploaded to the background for alarm. U8 is a smoke sensor module that can detect smoke particles in the air in real time. Figure 3Middle: C16 is a filter capacitor to ensure that the working power supply of the smoke sensor module U8 is in a stable state. R34 is a current limiting resistor to protect the module from overcurrent. When there is no smoke in the air, pin 1 of U8 outputs a low level. At this time, the LED lamp D6 is turned on and is in a light-emitting state, indicating that it is currently in a normal state. Pin 2 of U8 outputs a high level. At this time, the LED lamp D7 is not turned on and is not in a light-emitting state, indicating that it is currently in a normal state. Pin 4 of U8 outputs a low level and cannot drive the transistor Y1 to work. Then the voltage at the YGBJ point is at a high level. When the MCU detects that the voltage at the YGBJ point is high, it indicates that it is currently in a normal state. When there is smoke in the air, pin 1 of U8 outputs a high level. At this time, the LED lamp D6 is not turned on and is not in a light-emitting state, indicating that it is currently in a smoke state. In the alarm state, the 2nd pin of U8 outputs a low level. At this time, the LED lamp D7 is turned on and is in the light-emitting state, indicating that it is currently in the smoke alarm state. The 4th pin of U8 outputs a high level. Through the current-limiting resistor R35, a small current can be generated, so that the driving switch transistor Y1 works, and the voltage of the YGBJ point is at a low level. When the MCU detects the low voltage of the YGBJ point, it indicates that it is currently in the smoke alarm state. R36 is a low-level discharge resistor to prevent the level of the output of the 4th pin of U8 from breaking down Y1 when the level changes too much, thereby protecting Y1. R30 is a current-limiting resistor. When Y1 is turned on, it ensures that VCC3.3V will not be directly pulled down to the ground level, causing abnormal system voltage. The water immersion monitoring module monitors whether there is water in the transformer room to prevent water leakage in the transformer room. Figure 4 In the figure, the SJ_RX pin is the AD acquisition pin of the microcontroller and is pulled down to a low level through the pull-down resistor R24. SJ_IN and SJ_OUT are connected to the two pins of the water immersion sensor respectively. When there is water at the monitoring point, the two pins of the water immersion sensor will be turned on, that is, SJ_IN and SJ_OUT will be turned on, and the voltage value read by the microcontroller pin SJ_RX will change, thereby judging that a water immersion alarm has occurred. D1 and D4 are voltage-stabilizing diodes, whose function is to control the voltage across SJ_OUT and SJ_IN within 5.1V to protect the U11 microcontroller chip. R17 and R25 are voltage-dividing resistors. When SJ_OUT and SJ_IN are turned on, the SJ_RX voltage is approximately 3.3V. (R17 / R17+R25), the partial discharge monitoring module monitors the change value of ultrasonic data when the transformer generates partial discharge, such as Figure 5In the figure: U1, U4, and U5 are three ultrasonic sensors of different frequency bands. They can be connected in parallel to form an ultrasonic group with a measurement frequency of 20K~60KHZ. C1 and C6 are DC-blocking capacitors to remove the DC component in the signal. R4 and R11 are current-limiting resistors to protect U2 from being broken down by the ultrasonic group. R2 and R13 are ground-stabilizing resistors. U2 is a first-stage amplifier with an amplification factor of 1+R15 / R13=6 times. C3 is a DC-blocking capacitor to remove the DC component in the signal. R9 and R12 form a second-stage amplifier circuit with an amplification factor of 1+R12 / R9=6. R1 is a ground-stabilizing resistor. C2 is a DC-blocking capacitor to remove the DC component in the signal. R16 and R5 form a third-stage amplifier circuit with an amplification factor of 1+R16 / R5=2 times, C7 is a filter capacitor to ensure a smooth output waveform; C4 and R10 form an RC filter circuit to perform RC filtering on the signal, R3 and R10 form a four-stage amplifier circuit, the amplification factor = 1+R10 / R3=201, R14 is a ground balancing resistor, R6 and C5 form an RC filter to protect U6 from being broken down by the front end and play a filtering role at the same time, U6 is an analog-to-digital signal conversion chip that can convert the analog signal of the front end into a digital signal output and connect to the single-chip microcomputer MCU, among which R7 and R8 are pull-up resistors of the U6 data pin to improve the driving capability, the LCD display module displays the data processed by the MCU through the LCD screen, and the operator can query the relevant data information through the LCD screen, such as Figure 6 In the figure: U10's 1, 3, 4, 5, and 6 are connected to the MCU's IO ports respectively, indicating that U10 and MCU interact through a protocol, and MCU data can be transmitted through these pins. C39 is a filter capacitor, which makes the U10 system operating voltage run smoothly. YJ_BG is the LCD screen backlight controller pin, which is connected to the MCU. When YJ_BG=1, the switch transistor Q6 can be turned on, that is, at this time, U10's 8th pin is also high level = 3.3V, then the LCD screen is bright, indicating that the LCD screen is lit. When YJ_BG=0, the switch transistor Q6 is not turned on, that is, at this time, U10's 8th pin is also low level = 0V, then the LCD screen is off, indicating that the LCD screen is off. The remote signal module is used to monitor external telemetry signals. When the external telemetry signal alarms, the alarm information can be uploaded to the background, such as Figure 7 In the middle: R72 is a current limiting resistor, R69 is a pull-up resistor. When there is no external telemetry fault signal, IN1=0V, which is a low level, and the IC1 optocoupler is not turned on, then NET_IN1=3.3V, the MCU detects a high level, and the system does not alarm. When there is an external telemetry fault signal, IN1=3.3V, which is a high level, and the IC1 optocoupler is turned on, then NET_IN1=0V, the MCU detects a low level, and the system alarms. The FLASH external expansion circuit module is to ensure that when the data capacity is insufficient, the data can be stored on the chip to ensure that the data can be permanently saved. Figure 8Middle: C48 is a filter capacitor to ensure stable operation of the chip voltage.

[0030] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A low-voltage power distribution intelligent IoT system device circuit, characterized in that: It includes a protocol converter unit and a low-voltage power distribution smart Internet of Things device unit. The protocol converter unit includes a power conversion module, a first communication module, a first power carrier communication module and a first MCU circuit module. The power conversion module is used for converting system voltage, the first communication module is used for data docking with external equipment, the first power carrier communication module is used for data output, and the first MCU circuit module is used for data interaction and control of the entire system operation of the protocol converter unit. The low-voltage power distribution smart Internet of Things device unit includes a current monitoring module, a voltage monitoring module, a smoke detection module, a temperature and humidity detection circuit module, a power conversion circuit, a liquid crystal display module, a second communication module, a second power carrier communication module, a 4G communication module, a remote signaling module, a FLASH expansion circuit module, a second MCU circuit module, a water immersion monitoring module and a partial discharge monitoring module.

2. The low-voltage power distribution intelligent IoT system device circuit according to claim 1, characterized in that: The current monitoring module is used to monitor the current of the indoor cable of the transformer, and the voltage monitoring module is used to monitor the voltage of the indoor cable of the transformer.

3. The low-voltage power distribution intelligent IoT system device circuit according to claim 2, characterized in that: The smoke sensor module is used to monitor the smoke alarm in the transformer room, and the temperature and humidity monitoring circuit module is used to monitor the temperature and humidity of the transformer room environment.

4. The low-voltage power distribution intelligent IoT system device circuit according to claim 3, characterized in that: The liquid crystal display module is used for local liquid crystal display and operation, and the second communication module is used for data collection from the electric meters in the transformer room and for communication between external communication modules.

5. The low-voltage power distribution intelligent IoT system device circuit according to claim 4, characterized in that: The second power carrier communication module is used to collect and summarize data from the bottom cable branch box and each sub-meter in the meter box, and to use it for precise positioning.

6. The low-voltage power distribution intelligent IoT system device circuit according to claim 5, characterized in that: The 4G communication module is used for data exchange between IoT platforms and can be used for remote monitoring and control.

7. The low-voltage power distribution intelligent IoT system device circuit according to claim 6, characterized in that: The telemetry module is used to alarm local telemetry fault signals.

8. The low-voltage power distribution intelligent IoT system device circuit according to claim 7, characterized in that: The FLASH external expansion circuit module is used for storing and querying data, and the second MCU circuit module is used for data interaction and control of the entire system operation of the low-voltage power distribution smart IoT device unit.

9. The low-voltage power distribution intelligent IoT system device circuit according to claim 8, characterized in that: The water immersion monitoring module is used to monitor the water immersion situation in the transformer room and confirm the waterproof effect.

10. The low-voltage power distribution intelligent IoT system device circuit according to claim 9, characterized in that: The partial discharge monitoring module is used to monitor the partial discharge of the transformer in the transformer room to prevent the partial discharge from causing discharge.

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