Browsing by Author "Zemskyi, Denys R."
Now showing 1 - 2 of 2
Results Per Page
Sort Options
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.Item Increasing Power Supply Efficiency for “Two Wire-Rail” Line Consumers(Instytut Kolejnictwa, Warszawa, 2020) Bosyi, Dmytro O.; Zemskyi, Denys R.EN: The article is devoted to the problem of non-traction consumers power supply of AC railways. Th e low efficiency of energy transfer is caused by the design of a non-traction power supply line. Th e absence of bilateral power is typical for non-traction network 27,5 kV which consist of “two wire-rail” lines. This line is outdated technology, which does not correspond to modern requirements on the power quality, but used on AC railways with three-phase traction transformers. The purpose of the article is to investigate the methods of power supply improvements for non-traction consumers in terms of voltage unbalance, harmonic distortions and energy losses. Connection of the phasing device to delta winding traction transformer for bilateral supplying non-traction customers from network 27,5 kV is suggested in the article. The implementation of a method to increase the efficiency of electricity transmission in the non-traction network power supply allows to reduce power losses from 720 MWh / year to 441 MWh / year, the voltage unbalance from 1,9% to 1,3% and the total harmonic distortion from 8 % to 6 % respectively. Additionally, investment attractiveness of the decision was evaluated.