TRANSFORMER UNIT Russian patent published in 2003 - IPC

FIELD: transformers for high-power converter substations. SUBSTANCE: transformer unit has two coil-and-core assemblies and tap changer incorporating movable and fixed contacts. First coil-and-core assembly is connected to supply mains and has regulating winding with regulating taps designed for connection to fixed contacts of tap changer. Second coil-and-core assembly has secondary winding connected to load and primary winding. Novelty is introduction of two adjustable components. Coil-and-core assembly connected to supply mains is provided with auxiliary winding. One of auxiliary-winding leads and first lead of one of regulating components are connected to movable contact of tap changer. Other lead of auxiliary winding is connected to one of first leads of second regulating component. Second leads of regulating components are connected to primary winding of coil-and-core assembly. EFFECT: reduced voltage regulation stage; enhanced service life of tap changer. 1 cl, 2 dwg