AUXILIARY POWER SUPPLY SYSTEM FOR POWER STATION UNIT Russian patent published in 2005 - IPC

FIELD: electrical and power engineering; power stations using unit-type power supply circuits.

SUBSTANCE: proposed system designed to provide for auxiliary power supply to station power unit, as well as to maintain desired voltage level across switchgear installation and auxiliary power consumers of power unit both in the course of variations in the parameters of the latter and in case of short circuits in station switchgear installation and adjacent supply mains has generator, unit transformer, station switchgear and auxiliary power installations, operating and additional auxiliary-power transformers. Line leads of generator stator winding are connected through unit transformer and operating transformer to switchgear installations and to auxiliary-power installations, respectively. Second winding of additional transformer is connected in parallel with power circuit between secondary winding of operating transformer and auxiliary-power switchgear installation. Primary winding of additional transformer is connected in series with power unit load circuit, that is, this transformer runs under load-specified conditions. Power supply system may be provided with additional auxiliary-power switchgear installation, additional transformer being provided with additional secondary windings. This power supply system may be also provided with current-limiting reactors.

EFFECT: enlarged functional capabilities, enhanced operating reliability.

3 cl, 9 dwg