Resumo:
The power system studies carried out on planning level to define the transmission expansion system, in general, do not include accurate models for substations bus arrangements. On the other hand, as it is known some substations were involved in recent black-outs occurred in the Brazilian system because of failures in its bus arrangements. The main consequences were the multiple and simultaneous outages in the transmission system, showing the necessity of detailed analysis. The main goal of this work is to propose quantitative indices to do comparative studies, taking in account different substations. This kind of analysis will make possible the improvement of the existing substations and to assure that the future ones will not represent a high risk to the system security. Indices are proposed, tests are carried out and the advantages and disadvantages, as long as the limits of the metodology are discussed.
