Abstract: The invention relates to a method for operating a steam turbine (5, 5′) in which steam supplied as fresh steam (FD) that is expanded in order to effect work. According to the invention, the fresh steam (FD) is generated in a gas turbine (2, 2′) by heating cool steam (KD) that is supplied thereto. To this end, the steam turbine (5, 5′) that is cooled with the water vapor (WD) is connected on the inlet side to the steam-cooled gas turbine (2, 2′) via a fresh steam line (6, 6′) through which the heated cool steam (KD) is supplied as fresh steam (FD) from the gas turbine (2, 2′) to the steam turbine (5, 5′).

Abstract: A steam turbogenerator set includes a common shaft for a steam turbine and a driven machine with a generator, downstream of which a frequency converter is connected. Electrical power can be fed at a predetermined frequency through the frequency converter into a load network. Bearings of the common shaft are cooled and lubricated with water. Since there is no gearing requiring cooling and lubricating, and control valves for the steam are also driven without oil, the risk of contamination or fire caused by oil is avoided. A method for operation of the steam turbogenerator set is also provided.