Operational Risk Analysis for the Electric Power Station Protections

The failures in the operational state of an electric power system and their effects are taken in consideration with the reference to the modern protection types, which need to include the data uncertainties in their risk modelling. The paper presents the possible failures and their effects on the electric installation for the power stations. The protections of the electric power system need a special attention because of their subsystems, waiting for the failure. The risk of not answering to the failures, for a power protection system, must be minimized. The fuzzy logic including uncertainties helps to find a qualitative model for each one of the protections associated with different failure types for an electric power equipment. It gives the operational risk overview of the protections related to the failures associated to the protected electric power equipment.