FIELD: power supply systems for electrified transport incorporated in ac traction substations.
SUBSTANCE: proposed method includes uniform distribution of contact-system leading and lagging phase load among three phases of traction transformer due to rectifying three-phase voltage picked off transformer and inverting it into sine-wave voltage at frequency equal to fundamental-harmonic frequency by means of off-line single-phase inverters and applying it to contact-system phase leads.
EFFECT: enhanced operating efficiency of transformer, reduced reverse-sequence unbalance ratio.
1 cl, 2 dwg
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