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 technique of phase detection
system is discussed in this paper. When phase sequence are reverses at that time a relay system operates and a
three phase sypply gets turns off. A micro-controller is used to incorporate the algorithm into it
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