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This article deals with the problem of calculating the additional real-power losses in double-wound supply transformers with voltage class 6 (10)/0,4 kV, caused by unbalanced active inductive load connected in a star connection with an insulated neutral. When solving the problem, authors used the theory of electric circuits, method of balanced components, field and comparative experiment, modern devices for the analysis and synthesis of electric circuits. With the research results authors obtained the functional dependence, allowing calculating the additional losses in the transformer caused by unbalanced load, which differ from the similar ones due to the use phase resistance. In order to confirm the obtained functional dependence, researchers measured current, voltage and real power for each phase of "distribution transformer-unbalanced load" module. The experiment results allowed making a conclusion that the real-power losses, calculated according to the classical formula, should be adjusted in accordance with the developed functional dependence. The application of functional dependence is possible in organizations involved in the design, replacement and upgrading of transformer substations of urban and industrial distribution networks of electric power systems in order to increase energy savings in them.

1Boy Crusoe

By Allan Eric

Also published as" A Yankee Crusoe" . A 15 year old hard working and studious farm boy finds the lure of adventure on the seas as a merchant seaman more than he can resist. This is his story. " I was born in a little town in the State of Maine, near the close of the Civil War. My boyhood life did not differ materially from that of the average farmer's son in the remote country districts of New England--except, perhaps, that I read more and thought more. Hard work on the rugged soil, two terms each year in the little yellow country schoolhouse, a day's fishing now and then filled the early years of my life full to over-flowing. " What he gets is enough excitement and adventure to overflow his wildest dreams. How he experiences disaster and uses his wits and knowledge to overcome every problem makes for a great read. - Summary by Phil Chenevert