Crucial requirements to the diagnostics systems of electrical equipment have been formulated which take into account the conception of Smart Grid. Results pertaining to the issues of diagnostic signals formation in operating electrical equipment are considered. Informational support for multilevel systems of electrical equipment has been presented. The basic components of the informational support are discussed, including mathematical models of diagnostic signals, and also models simulating the process of forming the training datasets; the latter cover both certain defects of investigated electrical equipment units and their operating modes. Various representations of training datasets have been introduced and investigated; the datasets cover certain technical conditions of electrical equipment units in the variety of operating modes.
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