A Novel Objective Function for Directional Overcurrent Relays Coordination

Directional overcurrent relays (DOCRs) are widely used to protect power systems. For optimalcoordination of DOCRs, several techniques have been proposed to solve this problem. A common wayof optimal coordination of DOCRs is using evolutionary algorithms such as genetic algorithm (GA). Inthis paper, a novel strategy for DOCRs coordination is proposed. In the proposed strategy, a newobjective function (OF) is introduced. The proposed objective function can removed mis-coordinationbetween paired relays and can result in better coordination. Proposed OF is applied to 6-bus and 30-bussample networks.