Device and method for direct current power supply to a traction system by means of converters from different alternating current or direct current voltages

摘要

The traction supply has convertors (1,2) that can accept a range of supply voltage levels, both alternating and direct (UAC, UDC). The convertors are connected on the alternating current side to first and second secondary windings of a supply transformer. The convertors are connected in series to provide a mid-point (10) to provide a connection (11B) for the supply. The circuit connecting the convertors to the overhead line has switches (8A,8B) so the alternating supply can be connected to the transformer primary or the direct supply connected directly to the convertor output.