Design of Molded Case Circuit-breaker Four Level Protect Function Testing System Based on Digital Signal Processor

A testing system of molded case circuit-breaker four level protect function was designed and analyzed. The system made the digital signal processor(DSP) TMS320F28035 as the core, with the corresponding circuits and testing molded case circuit-breaker four level protect function. Overall structure diagram and the interface circuit of the protect function testing system were expounded. This system adopted RS-485 serial bus to communicate with the PC. The PC set the parameters and displayed the result.