Short circuit conditions can occur unexpectedly in any part
of a power system at any time due to various physical problems. Such situations cause a large amount of fault current flow through some power system apparatus. The occurrence of the fault is harmful and must be isolated promptly by a set of protective devices. Over several decades, protective relaying has become the brain of power system protection [1]. Its basic function is to monitor abnormal operations as a "fault sensor" and the relay will open a contractor to isolate a faulty part from the other parts of the