Patent ID: 7765807

Claim:
A method for warming-up a steam turbine having a high-pressure turbine section, an intermediate-pressure turbine section and a rotor, comprising: fluidically connecting the high-pressure turbine section on the inlet side via a live steam line to a steam generator; arranging a steam valve between the high-pressure turbine section and the intermediate-pressure turbine section; warming up the high-pressure turbine section, the live steam line and the steam generator simultaneously by: increasing an outlet side back-pressure of the high-pressure turbine section, opening a valve, arranged upstream of an inlet of the high-pressure turbine section, as soon as the conductivity of the steam which is produced in the steam generator falls below a tolerance value, closing the steam valve arranged between the high-pressure turbine section and the intermediate-pressure turbine section, governing a rotational speed of the rotor of the high-pressure turbine section at a rotational speed below the nominal speed, reducing the back-pressure as soon as the conductivity of the steam produced in the steam generator falls below a limiting value, wherein the limiting value is lower than the tolerance value, and warming-up the intermediate-pressure turbine section with the steam produced by the steam generator and the conductivity of which is below the limiting value, by opening the steam valve arranged between the high-pressure turbine section and the intermediate-pressure turbine section.