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The advanced age of electrical equipment from the high voltage power stations, correlated with the power sector restructure, the reduction of personnel, the increasing competition in the service market, and more recently with the economic crisis, determine the need to introduce new solutions and criteria for the correct on-line evaluation of the current technical condition of the electrical equipment in power stations, in order to assess correctly the withdrawal of the equipment from operation, to plan the need for maintenance works, to increase the financial and technical efficiency of these works, to support a correct operation risk evaluation. For the power companies, one of the main methods to obtain the mentioned benefits, including cost reduction, is to use intelligent systems for on-line monitoring of primary equipment from electrical power stations. The current paper describes the parts of the intelligent system, dedicated to on-line monitoring of primary equipment from high voltage electrical substations, respectively the components of the complex system NOVA EMCSIT, designed for the on-line monitoring of power transformers, shunt reactors, circuit breakers, disconnectors, voltage & current transformers and surge arresters. These intelligent monitoring systems can be used stand-alone or within an integrated system for on-line monitoring of electric power stations and substations - Smart Grids.