Directional Ground Overcurrent Protection Setting Calculation in Transmission Network by Using Differential Evolution Algorithm

The paper presents the procedure of directional ground overcurrent protection setting calculation in the transmission network by using classical calculation procedure and by using an advanced algorithm of differential evolution. To meet the basic requirements of relay protection systems such as speed, selectivity, coordination and sensitivity, the conditions that need to be considered when setting directional ground overcurrent protection are defined. By using the optimization method, the problem was solved in two ways. In the first case, the settings are designed to minimize the total response time of directional ground overcurrent protection to remote-end high-resistance faults, whereas in the second case the settings are designed so that the maximum response time to remote-end high-resistance fault is minimal. The results obtained using the classical approach are compared with the results obtained using the optimization method and the advantages and disadvantages of both approaches are highlighted.