POWER SUPPLY DEVICE FOR AC RAILWAYS AND REGIONAL NON-TRACTION CONSUMERS Russian patent published in 1995 - IPC

FIELD: electrified railways. SUBSTANCE: device has three-phase transformer 1 with primary and secondary windings. Symmetrical primary winding 2 is connected to supply line. Non-symmetrical coils 4,5 and 6 of secondary winding have tap-offs in all phases and are connected according to non-standard circuit diagram which makes it possible to use transformer for simultaneous supply of two single-phase traction loads and two regional consumers at standard voltages. Owing to the fact that traction load is distributed in one secondary winding of transformer, higher efficiency of transformer is provided which makes is possible to less frequently connect standby equipment in parallel with main one and thus save energy. EFFECT: higher efficiency, cut down power consumption. 2 dwg