Study on electrified rail transit systems and energy quality and recovery of urban rail transportation systems

Electrified rail transportation systems are indispensable in today?s world. Its importance at both urban and suburban is increasing every other day. So that, traction power substations are installed for supplying continuos, safe and good quality enegy to the rail vehicles. Energy supplement of electrical railroad vehicles is different from the consumer feeding.Beside of all necessities, conditions explained below should be considered:? Uninterrupted energy should be supplied by contact wires or third rails.? Absorption ability of braking energy from running rails.? To provide the voltage defined in international standarts and other related specifications.This study is about main rail energy supply, control concept and possibilities of quality energy and redesigning a public bus line as metro.