Micro-controller based 3-phase sequence indicator

Phase sequence is the order in which the rotated voltage or current generated by 3-phase system attain peak or maximum value. Each sequence voltage is 120 degree apart. Therefore, the maximum value achieved by each sequence is at the definite time interval. Based on this individual response time a new technique of phase detection system is discussed in this paper. An algorithm is developed in order to detect phase sequence. A micro-controller is used to incorporate the algorithm into it. The simulation result is illustrated here to verify the proposed algorithm. A prototype device was built to compare the practical and simulated result.