The issue of coordination of overcurrent relays includes
time setting multipliers (TSM) and plug setting (PS) with applying related constraints on operating time difference between backup and primary relays [4]. Over the past five Decades, several studies have been carried out on optimal coordination of overcurrent relays. These studies can be divided into three categories: 1) Trial and error method 2) Structural analysis method 3) Optimization method [5]. In recent years, artificial intelligence methods and nature-inspired algorithms such as Evolution Programming