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Item Energy Efficient Modes of Distribution Power Supply Systems with Different Vector Group of Transformer(National Technical University of Ukraine "Igor Sikorsky Kiev Polytechnic Institute", 2019) Zemskyi, Denys R.; Bosyi, Dmytro O.EN: The article is devoted to the experiment, what was performed on the local distribution networks with poort power quality. As a rule, these networks are subsystem of AC traction power supply system, and their design causes voltage unbalance and other power quality problems in consumers.Often, the network is powered by transformers with different vector groups, therefore their parallel operation is impossible. The purpose of the experiment is to assess the effect on energyquality of a regime with sources on both sides. The quality of electrical energy was estimated, considerable attention is devoted to unbalance voltage. Using the statistics methods measurement data are studied. During the experiment, the energy quality improved when the parallel mode was used. The tconcept of smart grid has been proposed to reduce energy losses for dynamic power management.