Low-voltage circuit breakers are one of the main electrical switches in the low-voltage distribution network of the power system. They can not only connect and disconnect normal load current and overload current, but also connect and disconnect short-circuit current. They are mainly used as power switches in frequently operated low-voltage distribution lines or switch cabinets, and protect lines, electrical equipment, etc. When they have serious overcurrent, overload, short circuit, phase failure, leakage and other faults, they can automatically cut off the line and play a protective role. They are widely used. Intelligent controllers are protection devices on circuit breakers and are also the core control devices of circuit breakers. In the 1990s, with the rapid development of power electronics technology, microelectronics technology, computer technology and communication technology, the protection devices of circuit breakers have developed from traditional electromagnetic overcurrent releases to electronic releases using integrated circuits, and now intelligent controllers with high-performance microprocessors have appeared. The new generation of intelligent controllers adopts a modular structure design, integrating measurement, monitoring, control, communication, protection and other functions, and has been widely used in low-voltage systems. In this topic, the intelligent controller uses the PIC148F448 produced by Microchip Company of the United States as the core processor in hardware, which mainly performs real-time data acquisition and processing and circuit breaker fault protection, and real-time display of line current or fault information during operation. The CAN bus interface is designed using the high-performance PIC18F448 microcontroller with CAN interface, and the hardware circuit and software flow of the CAN interface are given. The circuit has the characteristics of simple hardware design, high reliability, and strong real-time performance. The two-way communication function between the intelligent controller and the PC is realized, and the purpose of remote adjustment and remote control is achieved through the bus system, so that the performance of the intelligent controller is enhanced, which meets the requirements of the power distribution system and meets the research requirements of this topic.
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