Abstract
This paper presents an application's experience of estimation of the technical condition state of electrical equipment. Federal Grid Company of United Energy System is the biggest Russian Company for the electrical energy transport. The diagnostics of the basic oil-filled equipment of substations is a very complex problem for the personal of electrical networks and stations .At present there are more than 20-30 electrical and other parameters, which must be measured for the inspection of the state of the electrical equipment. Quality and the authenticity of the results of diagnostic measurements are the guarantee of the trouble-free operation of electrical equipment, the absence of damage from the interruptions of the power supply of the users of electric power. Basic errors, which appear with the measurements of the diagnostic parameters of electrical equipment, are the instrument, systematic and subjective of errors. The errors enumerated above can be considerably decreased with the use of information tools, i.e., software and of specialized automated working place (further SAWP).