On-line Monitoring System of DC Intelligent Circuit Breaker Based on ARM and FPGA

In this paper, an on-line monitoring system of DC intelligent circuit breaker based on ARM and FPGA is designed. The system integrates the functions of fault recording, fault diagnosis, fault logging, and current monitoring. Considering the minimum breaking time of the circuit breaker reaches 2ms, collecting enough fault current data within 2ms is a problem in system design. To solve it, the system utilizes the property that FPGA does not occupy CPU and the high-speed throughput rate of AD7606 to realize high-speed sampling of current at the speed of 100 KSPS. ARM's rich hardware resources and perfect development environment ensure the control of the system and current data transmission. After verification, the results show that the recording rate of the system reaches 100KSPS, the time scale accuracy of the current recording data is up to 1ms, and the current monitoring error reaches 0.2%.