Evaluation of energy loss in d.c. traction power supply system

For the purpose of further energy consumption reduction in d.c. traction power supply system, it is important to understand the overview of energy flow from generation and consumption and evaluate energy loss in each energy conversion stage. In this paper, supposing traction power supply system of East Japan Railway Company who has own power plants for railway and 154kV transmission line, the rough estimations of energy flow and energy loss are carried out.