Influence of MV distribution networks structure on voltage dips propagation

In this paper, transient behaviour due to voltage dips which occur in electric power MV distribution networks as a consequence of a fault by using an improved ATP circuit-breaker model are reported. The circuit-breaker is simulated by using a tool written in MODELS language and by arranging a time-variable differential arc-conductance based on the combination of Mayr´s and Cassie´s equations. An accurate analysis of the transient subsequent to circuit-breaker operation, in different fault conditions, are reported in order to show how the amplitude of the dip depends on the fault type, location and network structure.