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This paper showed the failure to monitoring, the selection of state variables and parameters of diagnostic, method of identification of failures and the flow of information. The results showed that the controls Partial Discharge (PD) are most effective for diagnostics of insulation, whereas, in the case of the large hydrogenerators of EDELCA filial of CORPOELEC in Venezuela, the predominant PD are corona and barbar (at the endwinding) while, depending on the features and availability of these facilities, there are opportunities to implement the system proposed for the development of real time controls. [ABSTRACT FROM AUTHOR]