Reliability analysis of DC traction power supply system for electric railway

Dc electric railway is one of the important application fields of low voltage dc power supply. The reliability analysis of each component in dc power supply system in East Japan Railway Company whose voltage level is dc 1.5kV was carried out. Such quantitative analysis can realize reasonable proposal of redundant dc circuit configuration. In this paper, the relation between the redundant configuration of traction substation circuit and reliability of power supply is calculated. In the last part of this paper, a novel method to convert influence of downtime of railway power supply system to the influence cost is proposed and the suitability of such a redundant configuration is confirmed.