Proteção Seletiva Contra Faltas à Terra no Estator de Múltiplos Geradores Conectados em Paralelo

Abstract

The protection against earth faults in the stator of generators is one of the main topics evaluated during the protection studies. In this context, several methods of protection against this type of defect have been developed over the years, however, none of the traditional methods is able to guarantee the selectivity of the protection system in scenarios that consider the operation of multiple generators in parallel, grounded by high impedance. Therefore, this paper proposes a test platform through a real-time simulation scope and evaluates a selective protection scheme against ground faults in the stator of synchronous generators. The results obtained allow us to conclude that the coverage and efficiency of the evaluated method is conditioned to the harmonic level present in each one of the generators that share the same busbar.