Auxiliary winding of a multibody traction transformer for filtering psophometric currents produced by interlaced modulation of PWM rectifiers

摘要

The paper deals with the problem of interferences produced by equipments utilized in railway traction systems; in particular the electrical traction drives are considered. A method for filtering harmonic currents produced by modulation of interlaced PWM rectifiers (V.S.R.) is described. An additional winding is introduced in the multibody traction transformer; it is properly sized together with a capacitance in order to minimize the interference level, reducing the psophometric current in the feeding network.