Parametrização das funções direcional de sobrecorrente (67) e de distância (21) dos relês de proteção de um sistema de distribuição em anel

Abstract

Due to the increase in demand for electricity consumption, transmission networks have become more extensive and increasingly complex, requiring more robust and adjusted protection systems the guarantee a high level of reliability to reduce the disconnection time on the lines and consequently, avoiding physical damage to equipment and materials to customers who use it. In view of this, the study presents a parameterization of directional overcurrent and distance by electrical impedance protection relays in an electrical power microsystem composed of 6 buses and 2 generations. The methodology consisted of parameterization of relays 50/51, 67 and 21 and simulation of faults at different points in the network. The results presented the value of the short circuit current and the performance of the electrical system through an expected response of the protection for each of the simulated faults. It was possible to conclude that the protections must be combined to provide greater assertiveness of the ideal parameters to serve a given network, improving its reliability, and seeking to increase its availability in the electrical power system.