NETWORK MODELING OF TRACTION SUBSTATION TRANSFORMERS FOR STUDYING UNBALANCE EFFECTS

The paper presents network mathematical models of traction substation transformers for simulation of the unbalance effects, due to railway d emands, on the power supply system. The admittance models consider win ding connections and phase-angle displacement between primary and seco ndary voltage. The proposed models are presented for the single-phase, V- and Scott connections of transformers used in, among other places, high-speed railway stations.