Abstract
The domestic AC railway power supply system uses a scott transformer with two single-phase transformers T-connected for resolving the unbalance on the AC 3-phase power supply side. However, when single-phase M-phase and T-phase railway vehicles on the secondary side of the scott transformer exist as single-phase loads with different capacity, unbalance of current on the power supply side occurs.<BR>In this paper, In this paper, simulations were performed according to theoretical considerations and experiments were performed using a prototype simulator. The current unbalance on the power supply system was investigated when there was an impedance deviation between the windings of the Scott transformer and electric railway vehicles with different capacities were present on the secondary side catenary. The average error rate of the calculated value obtained through the formula and the simulation result value was within 1.68%, confirming that the implementation of railway power supply system modeling was confirmed. Also, it was confirmed that the impedance difference between the Scott transformer windings and the M-phase and T-phase load capacity unbalance cause unbalance in the current flowing in the power system.
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