Uma Avaliação Comparativa Entre as Funções Direcional de Sequência Negativa e de Distância Aplicadas em Reatores Shunt

Abstract

Shunt reactors play a fundamental role in electrical power systems, helping to maintain voltage levels within acceptable limits. Given the importance of this equipment, this article proposes a comparative evaluation between two protection schemes for shunt reactors, the negative sequence directional function and the distance function. To support the proposed evaluation, several simulations of faults in shunt reactors are carried out using the Alternative Transients Program software. Then, the modeling used for the reactor is presented, which allows the application of turn-to-ground faults and inter-turn faults, considering the effect of mutual coupling between the subwindings formed in the fault phase, through the value of the leakage factor. The implemented simulations made it possible to evaluate the operating time and behavior of each protection function. Furthermore, it was possible to analyze how the performance of protection functions is affected by the number of short-circuited turns, the value of the leakage factor and the type of fault.