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The calculations of permanent regimes of high and very high voltage power substations are performed to predetermine the optimal operation of the analyzed power substation and the energy system from a technical point of view and economic. This paper presents the behavior of the 220/110/20 kV Sardanesti power substation for the current operating conditions, if the electricity consumption increases or decreases, checking the stability of the system in the Oltenia area and developing a strategy on the safety and security of the National Energy System. [ABSTRACT FROM AUTHOR]

The need to analyze the power subsector, which generates critical infrastructure, comes in the context in which the possible occurrence of cases of non-energy supply (black-out), generates major issues of national interest, with European and NATO implications. The authors consider that addressing the power subsector is a strictly national security issue because the lack of electricity can cause enormous damage to national power system and the national economy, which are almost total dependent on the power subsector. [ABSTRACT FROM AUTHOR]