By definition the power system is an integrator system: the system activity on the whole techological chain can be tackled in the same integrator and pragmatic manner which to allow the investigation of any side.Presently, any power politic has three fundamental elements: security of the energy supply, compatibility with the environment and competitivity.Obviously, the energy market creation have no contribution to increasing of the energy supply security because:• the market encourages a short term interests while the security assurance of the energy supply asks a long term approach.• the market by the utilisation of the cheapest solution of energy represents a danger for the economic balance on the long term.In this paper are tackled the elements concerning the behaviour in operation of the automation and protection equipments, the framing of the power plants in the loads curve and the system services integration as part as the safety of the system activity.This paper has like the basic reference an experience in the infrastrucure of the production, transport and distribution system over thirty years, paper which is detailed by all teaching staff from the Electrical Power Engineering department, within Valahia University of Târgoviste.
