The use of information for condition monitoring of the substations refurbishment is a very important problem. The ensuring continuous supplies of electricity to customers require the improvement of the equipment operation reliability and safety as a continuous process. The constantly monitoring and the diagnose techniques can contribute, in an essential way, at an improvement of equipment reliability. We can identify in advance the deteriorating tendencies and if it is the case, respective elements can be isolated before reaching the state of total failure. The paper present the main requirements of the monitoring installations in the EHV and HV substations, different devices of monitoring primary equipments located in the substations and the Romanian solutions for power transformer and autotransformer monitoring and the web based acknowledge.
