%0 Journal Article %T Improving Operational Efficiency Transformers Used in Commercial Power Systems %A Gracheva, E.. %A Mukhametzyanova, A.. %K demand factor, transfer performance factor, capacity losses, efficiency improvement of power transformers´ exploitation %J Actual directions of scientific researches of the XXI century: theory and practice %D 2014 %N 2 %P 9 %I FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov