CN209805511U

CN209805511U - Intelligent power distribution cabinet system based on Internet of things

Info

Publication number: CN209805511U
Application number: CN201921067374.XU
Authority: CN
Inventors: 冉小军
Original assignee: Sichuan Sanqin Electric Co Ltd
Current assignee: Sichuan Sanqin Electric Co Ltd
Priority date: 2019-07-09
Filing date: 2019-07-09
Publication date: 2019-12-17
Anticipated expiration: 2029-07-09

Abstract

The utility model discloses an intelligent power distribution cabinet system based on thing networking, include: the MCU, and a background center and a power distribution cabinet circuit connected with the MCU; the power distribution cabinet circuit comprises a circuit breaker switch, a power transmission circuit, a current sensor, a voltage sensor, a power meter, an electric energy meter and a temperature and humidity sensor; the MCU is connected with the power transmission circuit through a breaker switch; the current sensor, the voltage sensor, the power meter, the electric energy meter and the temperature and humidity sensor are arranged in the power transmission circuit and connected with the MCU. The utility model discloses a MCU gathers the running state of switch board and uses information such as number of times to based on internet of things, unify the control by the backstage center, realized the remote monitoring of switch board, the device that can monitor the switch board is ageing and running state.

Description

Intelligent power distribution cabinet system based on Internet of things

Technical Field

The utility model belongs to the technical field of thing networking switch board, especially, intelligent power distribution cabinet system based on thing networking.

background

In recent years, with the development of science and technology, a national grid company starts point testing work such as power consumer electricity consumption information acquisition, an intelligent substation, state monitoring and maintenance, intelligent scheduling, distribution network automation, intelligent electricity consumption and the like in sequence, so that the breadth and the depth of the point testing are further expanded, and the application of the internet of things technology in an electric power system is effectively promoted. The low-voltage power distribution system is an indispensable link in the power transmission process, and the safety and the reliability of the low-voltage power distribution system are closely related to the lives of a wide range of users.

The low-voltage power distribution cabinet is mainly responsible for controlling, protecting and measuring electric energy in a low-voltage power supply system, and about 80% of electric energy in China is supplied through low-voltage complete switch equipment. The low-voltage power distribution cabinet has wide application occasions and is suitable for power distribution systems in industries such as power plants, petroleum, chemical engineering, metallurgy, textile, high-rise buildings and the like. These application places are generally high in danger, and because the distribution voltage of a power distribution cabinet is high, the safety during manual operation cannot be guaranteed. Therefore, the automatic, intelligent and integrated control of the low-voltage power distribution cabinet is very necessary.

at present, most of power distribution cabinets applied to domestic industry are not intelligent enough, remote monitoring cannot be achieved for the power distribution cabinets, and although the safety and reliability of the protection switch reach the standard, the aging degree of the protection switch cannot be predicted.

Disclosure of Invention

the utility model aims to provide a: to the technical problem, the utility model provides an intelligent power distribution cabinet system based on thing networking.

The utility model adopts the technical scheme as follows:

An intelligent power distribution cabinet system based on the Internet of things comprises: the MCU, and a background center and a power distribution cabinet circuit connected with the MCU; the power distribution cabinet circuit comprises a circuit breaker switch, a power transmission circuit, a current sensor, a voltage sensor, a power meter, an electric energy meter and a temperature and humidity sensor; the MCU is connected with the power transmission circuit through a breaker switch; the current sensor, the voltage sensor, the power meter, the electric energy meter and the temperature and humidity sensor are arranged in the power transmission circuit and connected with the MCU.

Further, the current sensors comprise a first current sensor arranged at the input end of the power transmission circuit and N second current sensors arranged at the output end of the power transmission circuit; the voltage sensors comprise a first voltage sensor arranged at the input end of the power transmission circuit and N second voltage sensors arranged at the output end of the power transmission circuit; the power meter comprises a first power meter arranged at the input end of the power transmission circuit and N second power meters arranged at the output end of the power transmission circuit; the electric energy meter comprises a first electric energy meter arranged at the input end of the power transmission circuit and N second electric energy meters arranged at the output end of the power transmission circuit.

Furthermore, the power transmission circuit is of a three-layer structure and comprises a first layer of power transmission circuit, a second layer of power transmission circuit and a third layer of power transmission circuit; the first layer of power transmission circuits includes a first input circuit; the second layer of power transmission circuit comprises a second input circuit, a fuse and a surge protector; the third power transmission circuit comprises a third input circuit and N output circuits; each output circuit comprises an air switch, a fuse and a leakage protector; the first input circuit is connected with the second input circuit through the first disconnecting link, the first current sensor, the first voltage sensor, the first power meter, the first electric energy meter and the fuse; the second input circuit is connected with a third input circuit through a second disconnecting link, and the surge protector is arranged on the second input circuit; and the third input circuit is connected with the electric equipment through an air switch, a fuse, a second current sensor, a second voltage sensor, a second power meter, a second electric energy meter and a leakage protector.

Furthermore, the intelligent power distribution cabinet system based on the Internet of things further comprises a first radio frequency module connected with the MCU and a second radio frequency module connected with the background center; the first radio frequency module is in wireless connection with the second radio frequency module.

Furthermore, the first radio frequency module and the second radio frequency module both comprise an SIM communication module, an SIM driving module and a communication switching circuit which are connected with the SIM communication module; the communication switching circuit of the first radio frequency module is connected with the MCU; and the communication switching circuit of the second radio frequency module is connected with the background center.

Further, the first radio frequency module and the second radio frequency module further comprise a static suppression chip; the pin 1 of the static suppression chip is connected with the SIM _ RST end of the SIM communication module, the pin 3 is connected with the SIM _ VDD end of the SIM communication module, the pin 4 is connected with the SIM _ CLK end of the SIM communication module, and the pin 6 is connected with the SIM _ DATA end of the SIM communication module.

Furthermore, an SIM _ DATA end, an SIM _ CLK end and an SIM _ RST end of the SIM communication module are respectively connected with an I/O end, a CLK end and an RST end of the SIM driving module through an impedance resistor; the SIM _ VDD end of the SIM communication module is connected with the VCC end of the SIM driving module; the VRTC end of the SIM communication module is grounded through a capacitor C40.

Further, the communication switching circuit comprises a resistor R40, a resistor R41 and a resistor R44; one end of the resistor R40 is connected with the TXD end of the SIM communication module, and the other end is connected with the UART4_ RX end of the MCU or the background center; one end of the resistor R41 is connected with the RXD end of the SIM communication module, and the other end is connected with the UART4_ TX end of the MCU or the background center; the resistor R44 is connected with an electric connection point between one end of the resistor R41 and the RXD end of the SIM communication module.

further, the first radio frequency module and the second radio frequency module further comprise a switching circuit and an indicator light circuit;

the on-off circuit comprises a resistor R42, a resistor R48 and a switching tube; one end of the resistor R42 is connected with the startup and shutdown control end of the MCU or the background center, and the other end is connected with the base electrode of the switching tube; one end of the resistor R48 is connected with an electric connection point between the other end of the resistor R42 and the base electrode of the switch tube, and the other end of the resistor R48 is grounded after being connected with the emitting electrode of the switch tube; the collector of the switching tube is connected with the PWRKEY end of the SIM communication module;

The indicating lamp circuit comprises a light emitting diode D6, a light emitting diode D7, a resistor R39 and a resistor R43; the anode of the light-emitting diode D6 is connected with the NETLED end of the SIM communication module, and the cathode is grounded through a resistor R39; the anode of the light emitting diode D7 is connected to the STATUS end of the SIM communication module, and the cathode is grounded through a resistor R43.

Further, the first radio frequency module and the second radio frequency module further comprise a power supply circuit;

The power supply circuit includes: the LED driving circuit comprises a capacitor C45, a capacitor C46, a capacitor C47, a capacitor C48, a capacitor C49, a capacitor C50, a capacitor C53, a voltage stabilizing chip, a resistor R50, a resistor R51, a resistor R52, a resistor R53, a light emitting diode D8 and a zener diode D9; the power supply end is grounded through a capacitor C45 and a capacitor C46, and is connected with the Vin end and the On/Off end of the voltage stabilizing chip; the Vout end of the voltage stabilizing chip is connected with the VBRT end of the SIM communication module; the electric connection point between the Vout end of the voltage stabilizing chip and the VBRT end of the SIM communication module is grounded through a resistor R50 and a resistor R52, and is grounded through a capacitor C47, a capacitor C48, a capacitor C49, a capacitor C50, a resistor R51 and a capacitor C53, the cathode and the anode of a Zener diode D9, and is grounded through a light-emitting diode D8 and a resistor R53; the FB terminal of the voltage stabilization chip is connected with an electric connection point between the resistor R50 and the resistor R52.

To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:

The utility model discloses a MCU gathers the running state of switch board and uses information such as number of times to based on internet of things, unify the control by the backstage center, realized the remote monitoring of switch board, the device that can monitor the switch board is ageing and running state.

drawings

The invention will now be described, by way of example, with reference to the accompanying drawings, in which:

Fig. 1 is a block diagram of an embodiment of the present invention, which is based on an internet of things.

Fig. 2 is a power transmission circuit diagram of the present invention.

Fig. 3 is a block diagram of an intelligent power distribution cabinet system based on the internet of things in another embodiment of the present invention.

Fig. 4 is a circuit diagram of the SIM communication module of the present invention.

Fig. 5 is a circuit diagram of the SIM driving module of the present invention.

Fig. 6 is a circuit diagram of the static suppressing chip of the present invention.

Fig. 7 is a communication switching circuit diagram of the present invention.

Fig. 8 is a circuit diagram of the switching on and off device of the present invention.

Fig. 9 is a circuit diagram of the indicator light of the present invention.

Fig. 10 is a power supply circuit diagram of the present invention.

Detailed Description

The features and properties of the present invention are described in further detail below with reference to examples.

example 1

As shown in fig. 1, the intelligent power distribution cabinet system based on the internet of things provided by this embodiment includes: the MCU, and a background center and a power distribution cabinet circuit connected with the MCU; the power distribution cabinet circuit comprises a circuit breaker switch, a power transmission circuit, a current sensor, a voltage sensor, a power meter, an electric energy meter and a temperature and humidity sensor; the MCU is connected with the power transmission circuit through a breaker switch; the current sensor, the voltage sensor, the power meter, the electric energy meter and the temperature and humidity sensor are arranged in the power transmission circuit and connected with the MCU. In this embodiment, the MCU may be a processor, a processing device with a processor, or the like, and the MCU may send the alarm information and the original collected information to the back-end center in the form of digital signals to be displayed to the manager or the worker in the back-end center. Therefore, the background center can be a computer, a mobile phone or a tablet computer and the like with a display. Optionally, the MCU employs an STM32F103ZET6 chip.

In one embodiment, the current sensors include a first current sensor disposed at an input of the power transmission circuit, and N second current sensors disposed at an output of the power transmission circuit; the voltage sensors comprise a first voltage sensor arranged at the input end of the power transmission circuit and N second voltage sensors arranged at the output end of the power transmission circuit; the power meter comprises a first power meter arranged at the input end of the power transmission circuit and N second power meters arranged at the output end of the power transmission circuit; the electric energy meter comprises a first electric energy meter arranged at the input end of the power transmission circuit and N second electric energy meters arranged at the output end of the power transmission circuit. Therefore, the embodiment collects information of both input and output of the power transmission circuit.

as shown in fig. 2, in one embodiment, the power transmission circuit is a three-layer structure including a first layer of power transmission circuit, a second layer of power transmission circuit, and a third layer of power transmission circuit; the first layer of power transmission circuits includes a first input circuit; the second layer of power transmission circuit comprises a second input circuit, a fuse and a surge protector; the third power transmission circuit comprises a third input circuit and N output circuits; each output circuit comprises an air switch, a fuse and a leakage protector; the first input circuit is connected with the second input circuit through the first disconnecting link, the first current sensor, the first voltage sensor, the first power meter, the first electric energy meter and the fuse; the second input circuit is connected with a third input circuit through a second disconnecting link, and the surge protector is arranged on the second input circuit; and the third input circuit is connected with the electric equipment through an air switch, a fuse, a second current sensor, a second voltage sensor, a second power meter, a second electric energy meter and a leakage protector.

Illustratively, the first input circuit, the second input circuit and the first input circuit are all three-phase four-wire alternating current input circuits; the first layer of power transmission circuit is used as a master input circuit, and the first disconnecting link is a master switch of the power transmission circuit; the second layer of power transmission circuit is used as a protective layer, and the surge protector is used for restraining instant large current generated when the first knife brake is switched on and switched off. The third layer of power transmission circuit is a voltage distribution circuit, is provided with N branches, and uses a leakage protector to prevent fatal danger to electric personnel when the equipment has leakage fault. The first voltage sensor, the first power meter, the second current sensor, the second voltage sensor, the second power meter and the second electric energy meter support 380V and 50 Hz; the maximum measuring current of the first current sensor is 400A, and the maximum measuring current of the second current sensor is 100A; the maximum current of the fuse is 500A.

As shown in fig. 3, in another embodiment, the intelligent power distribution cabinet system based on the internet of things further includes a first radio frequency module connected to the MCU, and a second radio frequency module connected to the background center; the first radio frequency module is in wireless connection with the second radio frequency module.

The first radio frequency module and the second radio frequency module respectively comprise an SIM communication module, an SIM driving module and a communication switching circuit, wherein the SIM driving module and the communication switching circuit are connected with the SIM communication module; the communication switching circuit of the first radio frequency module is connected with the MCU; and the communication switching circuit of the second radio frequency module is connected with the background center.

The SIM communication module of this embodiment is a GPRS communication module, which is SIM800C manufactured by SIMCOM corporation, where GSM _ ANT is an SMA antenna pin; the SIM driving module is an SIM card, such as a Micro SIM card; in this way,

As shown in fig. 4-5, the SIM _ DATA terminal, the SIM _ CLK terminal, and the SIM _ RST terminal of the SIM communication module are respectively connected to the I/O terminal, the CLK terminal, and the RST terminal of the SIM card through an impedance resistor; and the SIM _ VDD end of the SIM communication module is connected with the VCC end of the SIM card. The SIM _ DATA is an input/output pin of SIM card DATA, the SIM _ CLK pin provides clock input of the SIM card, and the SIM _ RST is a reset pin of the SIM card; the resistor R46, the resistor R47 and the resistor R49 are impedance resistors and are used for impedance matching, and ESD protection is enhanced.

Furthermore, the VRTC end of the SIM communication module is grounded through the capacitor C40, the capacitor C40 can be used as an energy storage battery, when the SIM800C is abnormally powered off, the capacitor C40 can continuously supply power for the SIM800C, the data storage work is completed, and the data loss caused by abnormal power failure is prevented.

Furthermore, the SIM card is very susceptible to radio frequency interference due to its large area. Therefore, the system uses the SMF05C chip as a static suppression chip, and improves the anti-interference capability of the SIM card. Specifically, as shown in fig. 6, pin 1 of the esd chip is connected to the SIM _ RST terminal of the SIM communication module, pin 3 is connected to the SIM _ VDD terminal of the SIM communication module, pin 4 is connected to the SIM _ CLK terminal of the SIM communication module, and pin 6 is connected to the SIM _ DATA terminal of the SIM communication module.

Further, the SIM800C has two serial ports, and the system uses one of the serial ports as a port for communicating with the MCU, as shown in fig. 7, the communication switching circuit includes a resistor R40, a resistor R41, and a resistor R44; one end of the resistor R40 is connected with the TXD end of the SIM communication module, and the other end is connected with the UART4_ RX end of the MCU or the background center; one end of the resistor R41 is connected with the RXD end of the SIM communication module, and the other end is connected with the UART4_ TX end of the MCU or the background center; the resistor R44 is connected with an electric connection point between one end of the resistor R41 and the RXD end of the SIM communication module. The communication switching circuit can convert the 0-0.28V signal level of the SIM800C and the 0-3.3V signal level of the MCU.

The first radio frequency module and the second radio frequency module also comprise a switching circuit and an indicating lamp circuit;

as shown in fig. 8, the switching circuit includes a resistor R42, a resistor R48, and a switching tube; one end of the resistor R42 is connected with the startup and shutdown control end of the MCU or the background center, and the other end is connected with the base electrode of the switching tube; one end of the resistor R48 is connected with an electric connection point between the other end of the resistor R42 and the base electrode of the switch tube, and the other end of the resistor R48 is grounded after being connected with the emitting electrode of the switch tube; the collector of the switching tube is connected with the PWRKEY end of the SIM communication module; the S8050 is adopted by the switching tube, the resistor R42 is a current-limiting resistor, the resistor R48 is a bleeder resistor, when the switching tube is normally disconnected, electric charges exist between the base electrode and the emitter electrode, and the resistor R48 can enable the electric charges to be bled, so that the switching tube stably works.

As shown in fig. 9, the indicator light circuit includes a light emitting diode D6, a light emitting diode D7, a resistor R39 and a resistor R43; the anode of the light-emitting diode D6 is connected with the NETLED end of the SIM communication module, and the cathode is grounded through a resistor R39; the anode of the light emitting diode D7 is connected to the STATUS end of the SIM communication module, and the cathode is grounded through a resistor R43. The resistor R39 and the resistor R43 are both current limiting resistors. The light emitting diode D6 and the light emitting diode D7 are common light emitting diodes, the forward withstand current is usually very small, and the series connection of the resistor R39 and the resistor R43 can make the over current of the light emitting diode D6 and the light emitting diode D7 below 15 mA.

As shown in fig. 10, the voltage input range of the SIM800C is 3.4V to 4.4V, and the recommended voltage is 4.0V. When the module emits at maximum power, the current peak value is up to 2A instantaneously, which results in large voltage drop of the input voltage, so that the power supply circuit of the module must provide a stable voltage of 4V and a maximum current input of 2A. Thus, the first and second radio frequency modules further comprise a power supply circuit; the power supply circuit includes: the LED driving circuit comprises a capacitor C45, a capacitor C46, a capacitor C47, a capacitor C48, a capacitor C49, a capacitor C50, a capacitor C53, a voltage stabilizing chip, a resistor R50, a resistor R51, a resistor R52, a resistor R53, a light emitting diode D8 and a zener diode D9; the power supply end is grounded through a capacitor C45 and a capacitor C46, and is connected with the Vin end and the On/Off end of the voltage stabilizing chip; the Vout end of the voltage stabilizing chip is connected with the VBRT end of the SIM communication module; the electric connection point between the Vout end of the voltage stabilizing chip and the VBRT end of the SIM communication module is grounded through a resistor R50 and a resistor R52, and is grounded through a capacitor C47, a capacitor C48, a capacitor C49, a capacitor C50, a resistor R51 and a capacitor C53, the cathode and the anode of a Zener diode D9, and is grounded through a light-emitting diode D8 and a resistor R53; the FB terminal of the voltage stabilization chip is connected with an electric connection point between the resistor R50 and the resistor R52.

The voltage stabilizing chip adopts SPX29302, and the capacitor C45 and the capacitor C46 to filter the input voltage of the voltage stabilizing chip. The output end of the voltage stabilizing chip regulates the output voltage to be about 4V by using a resistor R50 and a resistor R52. And then, high-frequency and low-frequency components of the output voltage are filtered in a mode of connecting two large capacitors C47 and C50 and two small capacitors C48 and C49 in parallel. The resistor R51 is a load resistance of the output section. D9 is a Zener diode of 4.3V/0.5W, when the output voltage is higher than 4.3V, D9 will work in the breakdown region, clamping the voltage below 4.3V. The capacitor C53 is a 220uF tantalum capacitor, which is used to stabilize the output voltage.

The working principle is as follows:

The method comprises the following steps that the MCU controls the switch of the power distribution cabinet through a breaker switch, after electric energy is input, the electric energy is output through a power transmission circuit to supply power to electric equipment, in the process, the current, the voltage, the power and the electric energy in the power transmission circuit are respectively collected through a current sensor, a voltage sensor, a power meter and an electric energy meter, the temperature and the humidity of the internal environment of the power distribution cabinet are collected through a temperature and humidity sensor, and the collected current, voltage, power, electric energy and temperature and humidity are sent to the MCU; the MCU is pre-stored with a set current threshold, a voltage threshold, a power threshold, an electric energy threshold and a temperature and humidity threshold, so that the MCU can perform corresponding abnormal alarm by comparing the acquired current, voltage, power, electric energy and temperature and humidity with the set current threshold, voltage threshold, power threshold, electric energy threshold and temperature and humidity threshold; on the other hand, the MCU stores the service life (the theoretical maximum number of times of switching) of each period of the power distribution cabinet, and when the MCU sends a control signal to the circuit breaker switch to turn on the power distribution cabinet, the number of uses of each device of the power distribution cabinet in response is increased by 1, and an alarm is given when the number of uses reaches the service life of the corresponding device (or 80%, 90%, 95% and the like of the service life, which are set as required).

According to the above, the utility model discloses an MCU gathers the running state of switch board and uses information such as number of times to based on internet of things, by the unified control in backstage center, realized the remote monitoring of switch board, the device that can monitor the switch board is ageing and running state.

Claims

1. The utility model provides an intelligent power distribution cabinet system based on thing networking which characterized in that includes: the MCU, and a background center and a power distribution cabinet circuit connected with the MCU; the power distribution cabinet circuit comprises a circuit breaker switch, a power transmission circuit, a current sensor, a voltage sensor, a power meter, an electric energy meter and a temperature and humidity sensor; the MCU is connected with the power transmission circuit through a breaker switch; the current sensor, the voltage sensor, the power meter, the electric energy meter and the temperature and humidity sensor are arranged in the power transmission circuit and connected with the MCU.

2. The intelligent power distribution cabinet system based on the internet of things according to claim 1, wherein the current sensors comprise a first current sensor arranged at the input end of the power transmission circuit and N second current sensors arranged at the output end of the power transmission circuit; the voltage sensors comprise a first voltage sensor arranged at the input end of the power transmission circuit and N second voltage sensors arranged at the output end of the power transmission circuit; the power meter comprises a first power meter arranged at the input end of the power transmission circuit and N second power meters arranged at the output end of the power transmission circuit; the electric energy meter comprises a first electric energy meter arranged at the input end of the power transmission circuit and N second electric energy meters arranged at the output end of the power transmission circuit.

3. The intelligent power distribution cabinet system based on the Internet of things according to claim 2, wherein the power transmission circuit is of a three-layer structure and comprises a first layer of power transmission circuit, a second layer of power transmission circuit and a third layer of power transmission circuit; the first layer of power transmission circuits includes a first input circuit; the second layer of power transmission circuit comprises a second input circuit, a fuse and a surge protector; the third power transmission circuit comprises a third input circuit and N output circuits; each output circuit comprises an air switch, a fuse and a leakage protector; the first input circuit is connected with the second input circuit through the first disconnecting link, the first current sensor, the first voltage sensor, the first power meter, the first electric energy meter and the fuse; the second input circuit is connected with a third input circuit through a second disconnecting link, and the surge protector is arranged on the second input circuit; and the third input circuit is connected with the electric equipment through an air switch, a fuse, a second current sensor, a second voltage sensor, a second power meter, a second electric energy meter and a leakage protector.

4. The intelligent power distribution cabinet system based on the Internet of things of claim 1, further comprising a first radio frequency module connected with the MCU, and a second radio frequency module connected with the background center; the first radio frequency module is in wireless connection with the second radio frequency module.

5. The intelligent power distribution cabinet system based on the internet of things according to claim 4, wherein the first radio frequency module and the second radio frequency module respectively comprise an SIM communication module, an SIM driving module and a communication switching circuit, and the SIM driving module and the communication switching circuit are connected with the SIM communication module; the communication switching circuit of the first radio frequency module is connected with the MCU; and the communication switching circuit of the second radio frequency module is connected with the background center.

6. The intelligent power distribution cabinet system based on the internet of things according to claim 5, wherein the first radio frequency module and the second radio frequency module further comprise a static suppression chip; the pin 1 of the static suppression chip is connected with the SIM _ RST end of the SIM communication module, the pin 3 is connected with the SIM _ VDD end of the SIM communication module, the pin 4 is connected with the SIM _ CLK end of the SIM communication module, and the pin 6 is connected with the SIM _ DATA end of the SIM communication module.

7. The intelligent power distribution cabinet system based on the Internet of things of claim 5, wherein the SIM _ DATA end, the SIM _ CLK end and the SIM _ RST end of the SIM communication module are respectively connected with the I/O end, the CLK end and the RST end of the SIM driving module through an impedance resistor; the SIM _ VDD end of the SIM communication module is connected with the VCC end of the SIM driving module; the VRTC end of the SIM communication module is grounded through a capacitor C40.

8. the intelligent power distribution cabinet system based on the Internet of things of claim 6, wherein the communication switching circuit comprises a resistor R40, a resistor R41 and a resistor R44; one end of the resistor R40 is connected with the TXD end of the SIM communication module, and the other end is connected with the UART4_ RX end of the MCU or the background center; one end of the resistor R41 is connected with the RXD end of the SIM communication module, and the other end is connected with the UART4_ TX end of the MCU or the background center; the resistor R44 is connected with an electric connection point between one end of the resistor R41 and the RXD end of the SIM communication module.

9. The intelligent power distribution cabinet system based on the internet of things according to claim 6, wherein the first radio frequency module and the second radio frequency module further comprise a switching circuit and an indicator light circuit;

10. The intelligent power distribution cabinet system based on the internet of things according to claim 6, wherein the first radio frequency module and the second radio frequency module further comprise a power supply circuit;