Monitoring technical state of the power transformers is a necessary condition of the Smart-Grid technology introduction within the industrial electric networks

The purpose structure of the Smart Grid within the industrial electric networks is proposed. The most important part of the intelligent systems for continuous control and diagnostics of the power transformers is mentioned. The paper considers functions of the systems for diagnostics of technical state of the high-voltage transformer equipment. Monitoring systems introduced at the power transformers of the shop of the electric networks and transforming substations and of the combined heat and power plant at OJSC Magnitogorsk Iron and Steel Works are described. The module structure of the system is examined. The paper shows temperature trends of the upper oil layers and partial discharges at the high-voltage inputs. It provides an example of preliminary failure localization according to the parameters of the partial discharges. It also sets a challenge to develop methods of the multi-parameter diagnostics which help to localize and identify a failure according to the set of diagnostic features. Economic efficiency of introduction of the technical state monitoring systems is generally estimated.