In order to know the working condition of three-phase electrical equipment, we use a device that can detect various parameters of three-phase electrical equipment through a chip and display the parameters through an LCD screen. At the same time, users can use the touch screen to select functions such as drawing and storage. This device is low-priced and has stable performance. It can be used to detect more than 40 parameters of three-phase AC electrical equipment in industry.
Keywords: Internet of Things; three-phase electric meter; automatic control
Content:
2.1 Three-phase power reading module design
2.2 Core Control Module Design
2.3 IoT modules and peripheral network facilities
With the modernization of China's industrial technology, more and more industrial equipment has begun to combine with the Internet of Things technology and has burst out a huge market and potential. Most of the AC power equipment in the industry uses three-phase AC power. In order to know the working conditions of three-phase electrical equipment, electrical secondary equipment - three-phase meters were introduced. In China, after decades of development, three-phase meters have evolved from the original mechanical type to the most widely used digital type. At the same time, the device also has a storage function. When the three-phase electrical equipment is powered off, the detection device can still save the various parameters of the three-phase electrical equipment.
2.1 Three-phase power reading module design
This design uses the SPI bus to communicate with the main control chip. A small resistor is connected in series to the SPI signal line to reduce interference or jitter. This resistor, combined with the parasitic capacitance C at the IC input, can form a low-pass filter to eliminate any oscillation on the SPI interface signal. The resistor used this time is 100Ω. By adding an external capacitor (about 10pF) to the input end, the internal capacitance of the digital input end can be increased.
2.2 Core Control Module Design
The main control has powerful performance and low power consumption, meeting all the requirements of three-phase electricity meters. It connects to the measurement chip through the SPI bus and reads the data in its registers.
2.3 IoT modules and peripheral network facilities
For the IoT part, we selected an infinite high-fidelity network module dedicated to embedded systems, which is connected to the main control chip through a serial port. It has a built-in TCP/IP protocol and can be connected to the Wi-Fi network to achieve networking functions. The cloud server used in this project is an open and easy-to-develop IoT open platform. Through the platform, the measurement equipment is connected to the cloud. Through development and deployment, it can check the online status and abnormal conditions of the equipment data online.
This system focuses on the operation status monitoring of three-phase electrical equipment in the industrial field. By integrating chip detection, IoT communication and automatic control technology, a low-cost, high-performance intelligent detection solution is constructed. The equipment can collect more than 40 kinds of electrical parameters of three-phase AC electrical appliances in real time, visualize them on the LCD screen, and support touch screen operation to realize data drawing, storage and other functions. Parameter storage can still be maintained during power outages to ensure data integrity.