Intelligent monitoring system for switch cabinet

Abstract

The invention discloses an intelligent monitoring system for a switch cabinet, and relates to the technical field of intelligent monitoring of power equipment and the Internet of Things, the system comprises a main control unit, and a high-voltage live detection module connected with the main control unit and used for detecting the live state of three-phase high voltage in the switch cabinet in real time through a photoelectric isolation circuit; the environment monitoring module is used for detecting environment states in the switch cabinet, and the environment states comprise a temperature and humidity state, a smoke state and an infrared state; the safety interlocking control module is used for driving a cabinet door control relay of the switch cabinet through the level signal; the local display module is used for displaying the detection data and the environment state through an LCD display screen; and the wireless communication module is used for uploading the data of the environment state through the Wi-Fi module and receiving a remote control instruction of a terminal, and a simplified hardware circuit also reduces the production and maintenance difficulty and cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent monitoring of power equipment and Internet of Things, and more particularly, it relates to a switch cabinet intelligent monitoring system. BACKGROUND

[0002] The safe operation and intelligent monitoring of high-voltage switch cabinets are important guarantees for the reliability of power grids. In the prior art, some switch cabinet monitoring terminals integrating sensors and wireless communication have appeared, such as a scheme based on Bluetooth technology. However, such schemes have obvious limitations:

[0003] Firstly, the Bluetooth communication distance is short, and the operation and maintenance personnel need to be close to the cabinet to interact, which cannot realize remote and centralized monitoring. Secondly, the human-machine interface (such as an LED display screen) often uses a parallel interface, which occupies many microcontroller pins and the circuit wiring is complex. Thirdly, the driving of the relay usually uses a triode amplification circuit, which has potential risks such as component aging and insufficient driving current, and the reliability of the control link needs to be improved.

[0004] Therefore, it is necessary to upgrade the existing switch cabinet intelligent monitoring system to overcome the distance limitation of the Bluetooth scheme, optimize the hardware structure, and improve the reliability, maintainability and remote control ability of the system. SUMMARY

[0005] The present application relates to the technical field of intelligent monitoring of power equipment and Internet of Things, and more particularly, it relates to a switch cabinet intelligent monitoring system.

[0006] The above technical purpose of the present application is achieved by the following technical scheme:

[0007] In a first aspect, the present application provides a switch cabinet intelligent monitoring system, comprising a main control unit, and connected with the main control unit:

[0008] A high-voltage live detection module for real-time detection of the live state of three-phase high voltage in the switch cabinet through an optoelectronic isolation circuit;

[0009] An environment monitoring module for detecting the environmental state in the switch cabinet, the environmental state including temperature and humidity state, smoke state, and infrared state;

[0010] A safety interlocking control module for driving a cabinet door control relay of the switch cabinet through a level signal;

[0011] A local display module for displaying detection data and environmental state through an LCD display screen;

[0012] A wireless communication module for uploading data of the environmental state through a Wi-Fi module and receiving remote control instructions of a terminal.

[0013] On the basis of the above technical solutions, the application can also be improved as follows.

[0014] Further, the safety interlocking control module comprises a level driving circuit, the level driving circuit is connected with a GPIO pin of the master control unit, the GPIO pin outputs a high level or a low level to the level driving circuit, and the level driving circuit outputs a high level or a low level to control the on-off of the coil of the cabinet door control relay, and the on-off of the cabinet door lock power supply loop is controlled through the on-off of the coil of the cabinet door control relay.

[0015] Further, the LCD display screen is connected with the master control unit through a four-wire SPI interface, and the four-wire SPI interface comprises a serial clock line, a host output slave input data line, a host input slave output data line and a chip selection line.

[0016] Further, the Wi-Fi module is an ESP32 series Wi-Fi module, the Wi-Fi module is connected with the master control unit through a UART serial port, and the Wi-Fi module accesses a wireless local area network through a configured AT instruction or a built-in SDK.

[0017] Further, the high-voltage live detection module comprises a voltage transformer, a rectifier circuit and an optoelectronic coupler, the output end of the optoelectronic coupler is connected with an external interrupt pin of the master control unit, and the master control unit judges whether the live state is live through detection of a pulse rising edge.

[0018] Further, the smoke state is obtained through detection of a smoke sensor, the smoke sensor is an MQ-2 type sensor, and an analog output end of the smoke sensor is connected with an ADC input pin of the master control unit.

[0019] Further, the temperature and humidity state is obtained through a temperature and humidity sensor, the temperature and humidity sensor is a digital output type sensor, and the temperature and humidity sensor is connected with the master control unit through a single bus interface.

[0020] In the second aspect, the application provides a use method of the switch cabinet intelligent monitoring system, comprising the following steps:

[0021] The four-wire SPI interface is configured to drive the LCD display screen, the Wi-Fi module is initialized and connected to a preset network, and each sensor and a control GPIO pin are configured;

[0022] The master control unit collects a high-voltage live state, a temperature and humidity state, a smoke state and an infrared state, and refreshes the collected data of each state to the LCD display screen through the four-wire SPI interface; the master control unit also uploads a data packet formed by each state to a cloud server through the Wi-Fi module according to a predetermined protocol;

[0023] The master control unit listens to an instruction from a terminal through the Wi-Fi module, if a door opening request instruction is received, the master control unit queries the current high-voltage live state;

[0024] If the high-voltage live state is live, return the operation prohibition alarm through the Wi-Fi module, and keep the cabinet door locked state;

[0025] If the high-voltage live state is no live, control the GPIO pin to switch to the unlocking level signal, and drive the switch cabinet door to open.

[0026] In a third aspect, the present application provides an electronic device, comprising: at least one processor, at least one memory and a data bus;

[0027] The processor and the memory complete mutual communication through the data bus; the memory stores program instructions executable by the processor, and the processor calls the program instructions to execute the method of the second aspect.

[0028] In a fourth aspect, the present application provides a non-transitory computer readable storage medium, which stores computer instructions, and the computer instructions make the computer execute the method of the second aspect.

[0029] Compared with the prior art, the present application has at least the following beneficial effects:

[0030] In the present application, the switch cabinet intelligent monitoring system has long communication distance and flexible access. The Wi-Fi communication enables the system to access the existing local area network, supports remote monitoring, big data analysis and mobile APP cross-regional access, and realizes real remote intelligent management. The hardware structure is simplified and has high reliability. The SPI interface greatly reduces the connection of the display part, and the level direct-drive relay saves the peripheral driving circuit. The overall hardware is more simple, the potential fault points are reduced, and the reliability is improved. The control response is rapid and direct. The level signal control has no intermediate amplification link, and the GPIO state change directly causes the relay to act, so the response delay is lower and the control is more direct. At the same time, it is easy to expand and integrate. The Wi-Fi access capability facilitates the integration of terminals and other Internet of Things devices or system platforms. The I / O resources saved by the SPI interface can be used for future function expansion. The simplified hardware circuit also reduces the production and maintenance difficulty and cost. BRIEF DESCRIPTION OF DRAWINGS

[0031] The accompanying drawings, which are included to provide a further understanding of the embodiments of the application and constitute a part of this application, do not constitute a limitation to the embodiments of the application. In the drawings:

[0032] Figure 1 It is a schematic diagram of the overall structure in the embodiments of the present application;

[0033] Figure 2 It is a flowchart of the main program in the embodiments of the present application;

[0034] Figure 3The use logic diagram of the monitoring system in the embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0037] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0038] In the description of the embodiments of the present application, "a plurality of" represents at least 2.

[0039] Embodiment 1: With the development of industrial Internet of Things technology, Wi-Fi communication becomes a better choice for remote monitoring of devices due to its wide coverage, high bandwidth, easy access to existing network infrastructure and other advantages; at the same time, SPI serial peripheral interface is widely used in display driving and other fields due to its simple wiring and high communication rate; directly using the GPIO level of the microcontroller to drive the relay can simplify circuit design and improve response speed and control directness; therefore, an intelligent monitoring system for switch cabinets can be designed, which uses Wi-Fi to realize remote data interaction, SPI to drive local display, and level signal to directly control the relay of the switch cabinet, so the intelligent monitoring system for switch cabinets provided in this embodiment includes a master control unit, and connected with the master control unit are:

[0040] A high-voltage live detection module is used to detect the live state of three-phase high voltage in the switch cabinet in real time through an opto-isolation circuit.

[0041] Specifically, the high-voltage live detection module includes a voltage transformer, a rectifier circuit and an opto-coupler, the output end of the opto-coupler is connected to the external interrupt pin of the master control unit, and the master control unit judges the live state of whether live by detecting the rising edge of the pulse; the high-voltage live detection module adopts a high-reliability opto-isolation scheme to ensure the safe isolation of strong electricity and weak electricity.

[0042] The switch cabinet intelligent monitoring system further comprises a:

[0043] An environment monitoring module is configured to detect an environment state in the switch cabinet, and the environment state comprises a temperature and humidity state, a smoke state, and an infrared state.

[0044] Specifically, the smoke state is detected by a smoke sensor, and the smoke sensor is an MQ-2 sensor, and an analog output end of the smoke sensor is connected to an ADC input pin of the main control unit.

[0045] The switch cabinet intelligent monitoring system further comprises a:

[0046] A safety interlocking control module is configured to drive a cabinet door control relay of the switch cabinet by a level signal.

[0047] Specifically, the safety interlocking control module comprises a level driving circuit, and a GPIO pin of the main control unit is connected to the level driving circuit.

[0048] In the above, the safety interlocking control module directly controls the relay by the level signal; one GPIO pin of the main control unit can output a high level or a low level (such as 3.3V high level driving), and directly drives the relay coil through a simple current limiting resistor; this mode eliminates the amplifying elements such as triodes, and the circuit is more simple and reliable, reduces the fault points, and the response speed of the level signal is faster.

[0049] The switch cabinet intelligent monitoring system further comprises a:

[0050] A local display module is configured to display the detection data and the environment state on an LCD display screen.

[0051] Specifically, the LCD display screen is connected to the main control unit through a four-wire SPI interface, and the four-wire SPI interface comprises a serial clock line, a host output slave input data line, a host input slave output data line, and a chip selection line; the local display module adopts the LCD display screen with the SPI interface to replace the traditional parallel interface LED screen and the parallel port LCD. The SPI interface can complete high-speed data transmission only by a few lines (SCK, MOSI, MISO, and CS), greatly saves the I / O resources of the main control unit, simplifies the PCB wiring, and reduces the hardware complexity.

[0052] The switch cabinet intelligent monitoring system further comprises a wireless communication module connected with the main control unit.

[0053] The wireless communication module is used for uploading data of the environment state through the Wi-Fi module and receiving remote control instructions of the terminal.

[0054] Specifically, the Wi-Fi module is a Wi-Fi module of an ESP32 series, the Wi-Fi module is connected with the main control unit through a UART serial port, and is accessed to a wireless local area network through configured AT instructions or a built-in SDK; the Wi-Fi module is used to replace the original Bluetooth module; the module communicates with the main control unit through the UART, supports a STA / AP mode, can be accessed to a wireless local area network in a transformer substation or composed of a temporary network, realizes IP network connection of the terminal with a remote cloud platform, a monitoring background or a mobile phone APP, breaks through the distance limit, and is convenient for remote collection of data and issuance of instructions.

[0055] As shown in Figure 1 The intelligent monitoring terminal is modularly designed and constructed with a microprocessor (the main control unit in the above description) as a core; a power management module provides stable and reliable power supply for the whole system, usually converts AC power obtained in the switch cabinet into DC voltage required by the terminal; a sensor unit is a sensing front end of the system and directly interacts with the environment and electrical circuit in the switch cabinet; it comprises: a temperature and humidity sensor that monitors the environmental temperature and relative humidity in the cabinet in real time; a smoke sensor that detects smoke concentration caused by electrical overheating or failure; an infrared sensor that adopts a passive pyroelectric infrared sensor and is used for detecting whether small animals or personnel illegally invade the inside of the cabinet body; a high-voltage electrical detection sensor that adopts a detection circuit based on the photoelectric isolation principle and is used for non-contact sensing of the live state of the three-phase bus; a cabinet door switch photoelectric sensor that is used for detecting the opening and closing state of the cabinet door; analog signals collected by the sensor are converted into digital signals by an A / D converter for reading by the microprocessor; the microprocessor serves as a control center and is responsible for scheduling all tasks, processing data and executing logical judgment. The output of the microprocessor and a communication interface comprise: Wi-Fi communication through a built-in or externally connected wireless communication device, the microprocessor uploads data to a cloud server or responds to a remote instruction to realize remote monitoring; SPI communication is used for driving an LCD display screen to display real-time monitoring data and device states in a local area in an efficient serial mode; one or more GPIO pins of the microprocessor directly output high / low level signals and are used for controlling a relay of a cabinet door lock to realize electrical locking and unlocking of the cabinet door.

[0056] Referring to Figure 2After the device is powered on, system initialization is first performed; in this stage, the microprocessor completes the configuration of its own clock, interrupt system, peripheral interface (GPIO, SPI, ADC, UART, etc.), and initializes the FreeRTOS real-time operating system, while creating tasks such as LCD display screen, Wi-Fi module, network connection, and each sensor module also completes self-checking or calibration in this stage. After initialization is completed, the system enters task scheduling and executes multiple detection tasks in parallel: photoelectric detection reads the opening and closing state of the cabinet door; high-voltage electric detection judges whether three-phase is live by querying the output of the high-voltage electric detection sensor; infrared detection scans whether there is an intrusion signal; smoke detection obtains a smoke concentration analog value and performs A / D conversion; temperature and humidity detection reads the current temperature and humidity values; all collected data are filtered, calibrated and formatted in the microprocessor. In addition, the system changes the level signal of the specified GPIO pin to directly drive the relay coil and control the power-on and power-off of the cabinet door electromagnetic lock according to the high-voltage live state and remote command, etc. comprehensive logic, to realize the locking or unlocking of the door. Through the SPI interface, the formatted key information (live state "live / non-live", temperature, humidity, smoke alarm, door status, etc.) is refreshed to the LCD display screen to provide a local human-machine interface. Subsequently, the system actively reports the packaged sensor data, state information and event log to the remote server through the Wi-Fi network, and on the other hand, continuously listens to the control instructions or query requests issued by the server.

[0057] In summary, the entire system operates according to this process to realize real-time local sensing, display, safety control and remote monitoring of the high-voltage switch cabinet state, forming a complete intelligent monitoring closed loop.

[0058] Embodiment 2: The application provides a use method of a switch cabinet intelligent monitoring system. After the system is powered on, the SPI, Wi-Fi and other peripherals are initialized, and the Wi-Fi module automatically connects to the preset network. The collected data are refreshed to the local LCD through the SPI and uploaded through the Wi-Fi. When a remote door opening instruction is received through the Wi-Fi, the terminal strictly executes the logic: first, detect the high-voltage live state, if live, refuse and alarm; if not live, directly change the level of the control GPIO to drive the relay to open the door; the specific steps include the following steps:

[0059] S1, configure the four-wire SPI interface to drive the LCD display screen, initialize the Wi-Fi module and connect to the preset network, and configure each sensor and control GPIO pin.

[0060] S2, the master control unit collects high-voltage live state, temperature and humidity state, smoke state and infrared state, and refreshes the collected data of each state to the LCD display screen through the four-wire SPI interface; the master control unit also uploads the data packet formed by each state to the cloud server according to the predetermined protocol through the Wi-Fi module.

[0061] S3, the master control unit listens to the instructions from the terminal through the Wi-Fi module, and if the door opening request instruction is received, the master control unit queries the current high-voltage live state.

[0062] S4, if the high-voltage live state is live, return the prohibition operation alarm through the Wi-Fi module, and keep the cabinet door locked state.

[0063] S5, if the high-voltage live state is no electricity, control the GPIO pin to switch to the unlocking level signal, and drive the switch cabinet door to open.

[0064] Referring to Figure 3 , the two key logic flows in the Wi-Fi communication process are as follows: when the microprocessor receives a data request instruction from the user end (such as a mobile phone APP or background) through Wi-Fi, it will immediately package all the sensor data (including high-voltage detection data, temperature and humidity, smoke concentration, etc.) and device status (cabinet door status, etc.) collected and processed at the current time, and send them back to the user end through the Wi-Fi link; and the key process involving safety interlocking, when receiving a remote door opening instruction, the system first interrupts the regular process, immediately executes the judgment of "whether there is high-voltage inside", if it detects that there is high-voltage inside, the system will refuse to open the door, and immediately send a response message containing the high-voltage live warning to the user end through Wi-Fi; at the same time, ensure that the level signal controlling the cabinet door remains in the locked state; if it detects that there is no high-voltage inside, the system will execute the "open cabinet door" operation, that is, change the control level to drive the relay to open the door lock; at the same time, send a confirmation information of successful operation to the user end through Wi-Fi.

[0065] Embodiment 3: The electronic device provided in the embodiment of the application comprises at least one processor, at least one memory and a data bus.

[0066] The processor and the memory complete mutual communication through the data bus; the memory stores program instructions executable by the processor, and the processor calls the program instructions to execute the method of embodiment 2.

[0067] Embodiment 4: The non-transitory computer readable storage medium provided in the embodiment of the application stores computer instructions, and the computer instructions make the computer execute the method of embodiment 2.

[0068] Those skilled in the art will appreciate that embodiments of the application can be readily used as software, hardware, or a combination of software and hardware. In a software embodiment, various routines according to embodiments of the application can be stored in the memories of a general purpose computer, special purpose computer, or microprocessor. Such data can he downloaded to the memories 5 from computer program product available over the network, from computer program

[0069] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0070] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0071] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0072] Those skilled in the art will appreciate that all or portions of the methods and apparatuses described herein can be embodied in one or more various forms, including, but not limited to, program code, computer readable storage media, computer readable media, and / or the like. The program code, when executed by a computer, can implement one or more elements of the methods described herein. The program code can be stored in a computer readable storage medium, which can include, but is not limited to, any type of disk including floppy disks, optical disks, CD-ROMs, magnetic-optical disks, read-only memories (ROMs), random access memories (RAMs), erasable programmable read-only memories (EPROMs), electrically erasable programmable read-only memories (EEPROMs), magnetic or optical cards, flash memory, or any other type of media suitable for storing electronic instructions.

[0073] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A switchgear intelligent monitoring system, characterized in that, Includes a main control unit, and components connected to the main control unit: The high-voltage live detection module is used to detect the live status of three-phase high voltage in the switch cabinet in real time through opto-isolation circuit; The environmental monitoring module is used to detect the environmental conditions inside the switch cabinet, including temperature and humidity conditions, smoke conditions, and infrared conditions. The safety interlock control module is used to drive the cabinet door control relay of the switchgear through a level signal; The local display module is used to display detection data and environmental status via an LCD screen. The wireless communication module is used to upload environmental status data and receive remote control commands from the terminal via the Wi-Fi module.

2. The intelligent monitoring system for switchgear according to claim 1, characterized in that, The safety interlock control module includes a level driving circuit, which is connected to the GPIO pin of the main control unit. The GPIO pin outputs a high level or a low level to the level driving circuit. The level driving circuit outputs a high level or a low level to control the coil of the cabinet door control relay, and controls the power circuit of the cabinet door lock by controlling the coil of the cabinet door control relay.

3. The intelligent monitoring system for switchgear according to claim 2, characterized in that, The LCD display screen is connected to the main control unit via a four-wire SPI interface, which includes a serial clock line, a master output / slave input data line, a master input / slave output data line, and a chip select line.

4. The intelligent monitoring system for switchgear according to claim 3, characterized in that, The Wi-Fi module is an ESP32 series Wi-Fi module. The Wi-Fi module is connected to the main control unit via a UART serial port and accesses the wireless local area network via configured AT commands or the built-in SDK.

5. The intelligent monitoring system for switchgear according to claim 4, characterized in that, The high-voltage live detection module includes a voltage transformer, a rectifier circuit, and an optocoupler. The output terminal of the optocoupler is connected to the external interrupt pin of the main control unit. The main control unit determines whether the device is live by detecting the rising edge of the pulse.

6. The intelligent monitoring system for switchgear according to claim 5, characterized in that, The smoke state is obtained by detecting a smoke sensor, which is an MQ-2 type sensor. The analog output terminal of the smoke sensor is connected to the ADC input pin of the main control unit.

7. The intelligent monitoring system for switchgear according to claim 6, characterized in that, The temperature and humidity status is obtained through a temperature and humidity sensor, which is a digital output sensor and is connected to the main control unit through a single bus interface.

8. The method of using the intelligent monitoring system for switchgear according to claim 7, characterized in that, Includes the following steps: Configure the four-wire SPI interface to drive the LCD display, initialize the Wi-Fi module and connect it to the preset network, and configure each sensor and control GPIO pin; The main control unit collects data on high voltage energization, temperature and humidity, smoke, and infrared status, and refreshes the collected data on the LCD display screen through a four-wire SPI interface; the main control unit also uploads the data packets generated by each status to the cloud server through the Wi-Fi module according to a predetermined protocol. The main control unit listens for instructions from the terminal via the Wi-Fi module. If it receives a door opening request instruction, the main control unit queries the current high-voltage energization status. If the high voltage is energized, an operation-prohibited alarm will be returned via the Wi-Fi module, and the cabinet door will remain locked. If the high-voltage energized state is de-energized, the control GPIO pin switches to an unlock level signal and drives the switch cabinet door to open.

9. An electronic device, characterized in that, include: At least one processor, at least one memory, and a data bus; The processor and the memory communicate with each other via the data bus. The memory stores program instructions that can be executed by the processor, which invokes the program instructions to perform the method as described in claim 7.

10. A non-transitory computer-readable storage medium, characterized in that, The non-transitory computer-readable storage medium stores computer instructions that cause the computer to perform the method of claim 7.

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