Bosyi, Dmytro O.Zemskyi, Denys R.2021-01-162021-01-162020Bosyi D., Zemskyi D. Increasing Power Supply Efficiency for “Two WireRail” Line Consumers. Problemy Kolejnictwa. 2020. Iss. 188. P. 93–102. DOI: 10.36137/1881E.0552-2145 (print)2544-9451 (on-line)http://eadnurt.diit.edu.ua/jspui/handle/123456789/12405https://problemykolejnictwa.pl/images/PDF/188_1E.pdfD. Bosyi: ORCID 0000-0003-1818-2490, D. Zemskyi: ORCID 0000-0003-4322-0727EN: 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 This line is outdated technology, which does not correspond to modern requirements on the power quality, but used on AC railways with three-phase traction transformers.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.ennon-traction customerstwo wire-rail linephase coordinatesAC railwaypower qualityКІСЕArticle