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