Avaliação de Sobretensões Resultantes de Faltas Monofásicas em Sistemas de Distribuição com Geração Distribuída

This paper evaluates different scenarios of single-phase faults in the medium voltage system operating island and supplied by distributed generation (DG) with synchronous generator steady state, observing resulting overvoltages due to delta connection primary coupling transformer. In this context, present document proposes contribute technical issues related DG, presenting a series simulations carried out ATP Draw, considering installations framed simplified standard. It is not intended here exhaust all possible possibilities but rather assess how each main parameters influences from whether or neutral overvoltage protection function (ANSI 59N) mandatory for these installations. The results indicate that significant may occur depending on load, generation, fault impedance conditions.