Justification of power decrease of electric locomotive at three-phase system of electric traction when traction rectifier switches to open-phase mode

Abstract

The paper presents a short description of electric traction systems used on electrified railways in the world. For the proposed three-phase system of electric traction the authors consider features of operation of 6-pulse bridge rectifiers in full-phase and open-phase modes. The paper also demonstrates principal schemes and time diagrams that explain operation of 6-pulse bridge rectifiers in the open-phase mode at connection of valveside windings of a transformer «star» / «star» and «star» / «delta». On the basis of executed research the authors present relations that connect voltages, currents and power of 6-pulse bridge rectifiers in the open-phase mode for controlled and uncontrolled transformers.