to a minimum switch 19 the minimum switch 19 is connected to a pressure regulator 27 furthermore the minimum switch 19 is connected to a cascade point 21 that is connected in turn to a power regulator 23 and to a rotational speed regulator 25 the power regulator 23 is connected to a voltage power converter 41 the rotational speed regulator 25 is connected to a voltage rotational speed converter 43 the pressure regulator 27 is connected to a voltage pressure converter 45 the voltage power converter 41 is connected to the generator 5 the voltage rotational speed converter 43 is connected to a sensor 47 the sensor 47 measures the rotational speed n of the turbine at the gear 3 the voltage pressure converter 45 is connected to a pressure measuring device 46 for measuring the pressure d of the steam 7 the converters and regulators thus connected to one another form the regulating circuit 10 a simulation unit 51 is connected via lines 52a 52b and 52c to the regulating circuit 10 the simulation unit 51 has a measurement data store 53 an input unit 55 and a calculation unit 57 the measurement data store 53 is connected to the input unit 55 the calculation unit 57 is also connected to the input unit 55 moreover the calculation unit 57 is connected via a line 59 to a measurement unit 61 for measuring the mass flow of steam 7 entering the turbine 1 a line 63 which can be used for connecting further simulation units 51 branches off from the line 59 furthermore a monitoring data store 65 is connected to the regulating circuit 10 via lines 67a 69a.