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This paper describes a procedure to generate an adaptive Dimo equivalent. Fictitious nodes aggregate buses belonging to the same class of REI equivalence. As a result, an equivalent that preserves the physical characteristics of the power system is obtained. The reduced model is updated by using a realtime calibrating procedure. The resulting adaptive Dimo equivalent is suitable for subsequent use to reliably perform the security analysis function in a multi-area power system environment. Shunts are found to be of fundamental importance, and their treatment in network analysis algorithms is assessed. Numerical results are also discussed in this paper.