The article presents transformer winding connection schemes used for powering high-speed railway traction and equations describing instantaneous changes in voltages and currents at the terminals of these transformers. The presented equations allow for the determination of energy transfer rate coefficients for individual transformer winding connection schemes. These coefficients are helpful in making decisions regarding the selection of an appropriate transformer for given power supply conditions.The increase in the power of railway propulsion systems and the need to limit power losses in transmission systems create a need to supply railway traction networks with alternating voltage of 25 kV or 2 x 25 kV. The frequency of the voltage supplying railway traction as well as the value and frequency of the three-phase voltage of the power system supplying the traction substation depend mainly on historical conditions. Nevertheless, in every such power supply system, there is a need to transform voltages from a three-phase system to a two-phase voltage system. Such a widely known and long-used transformer serving this purpose is the Scott transformer [1]. (…)
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Source: Logistyka Magazine