9 Conclusion

This implemented emulation model for phase sequence detection of a three-phase A/C supply using the ZCD, UART, ADCC and Timer peripherals of the PIC18F56Q24 microcontroller. The application note also describes phase reversal, phase-loss fault detection and RMS voltage measurement on the three-phase A/C supply using the PIC18F56Q24 Curiosity Nano development board, Curiosity Nano adapter board and Waveform Click boards.

The usage of zero-cross detection enables faster, more precise and reliable detection of the phase sequence compared to the traditional approach using ADCC only, because the ADCC-related computation time is eliminated. Also, availability of the ZCD peripheral within the microcontroller makes the application more cost-effective and efficient by reducing both board space and bill of materials cost. The ZCD peripheral together with a set of analog and advanced digital peripherals of the PIC18F-Q24 microcontrollers are well-suited for the applications monitoring the phase-reversal and single-phasing faults of A/C power supplies.