Plataforma didática embarcada para reprodução de arquivos COMTRADE e emulação de relés de proteção em sistemas elétricos de potência

Abstract

This work presents the development of an embedded educational platform for COMTRADE file playback and emulation of power-system protection functions. The platform uses two ESP32 boards: one interprets the oscillographic record and reproduces one analog voltage channel and one current channel through an MCP4728 digital-to-analog converter; the other acquires these signals, estimates their fundamental phasors, and executes ANSI 21, 27, 50, 51, 59, and 67 functions. The records originate from three-phase fault simulations in Simulink, whereas the bench processes voltage and current from one selected phase in binary COMTRADE files. A JSON file generated after processing preserves the scales and reference values shared by both units. The platform brings protection theory closer to an accessible and reconfigurable practical experience. Experimental characterization established 1000 samples/s as the prototype’s operating limit for coherent playback of 60 Hz signals; above this rate, loss of timing synchronization was observed.