DC TRACTION SUBSTATION Russian patent published in 1998 - IPC

FIELD: electrical engineering; power supply to electrified railways and other electrified transport. SUBSTANCE: substation has semiconductor rectifier, three-pole cathode switch, output-voltage main plus and main minus buses, diode discharge devices, ripple device, and bypass disconnecting switches. Three-phase collecting buses connected through three-pole cathode switch to cathodes of isolating valves of cathode group are used as main plus bus to form plus terminal lead of rectifier. Connected to collecting buses are DC feeders that have three-pole switches whose respective poles are connected in series with controlled valves; valve cathodes on each feeder are electrically interconnected to form plus terminal leads of feeders. Voltage across feeder zones is directly regulated by controlled feeder valves with aid of device for stepless or stepped variation of control pulse shift angle; feeder disconnection is effected by canceling control pulses across controlled valves and sending command for disconnecting three-pole switch of feeder. EFFECT: improved service life of DC feeder switches and provision for separate voltage regulation across feeder zones. 2 cl, 1 dwg