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Protection relays play an important role in the power systems to maintain stability, reliability, selectivity, and security for the power systems. In this paper, genetic algorithm (GA) optimization technique with pilot protection (PP) and without pilot protection (WPP) has been used to obtain proper coordination and the optimum value of transmission lines protection relays between distance relays (DRs) and directional overcurrent relays (DOCRs), as well as the critical case for fails in high voltage circuit breaker (HVCB) during faults, so using breaker failure relays (BFRs) for IEEE-8 bus system. The main aim of the used PP to reduce the overall time of DOCRs. A comparison is made with previous work in literature to show the efficiency and accuracy of the proposed algorithm with PP and the total operation time of DOCRs in the network is minimized.

Coordination of Directional overcurrent, Distance, and Breaker failure relays using Genetic Algorithm including pilot protection.