The modes of operat ion of the steam turbine stage in non-steam and motor modes are considered. Analyt ical models of the operat ion of the stage with and without act ive power generat ion are obtained and analyzed calculat ion expressions are given for quant ifying the maximum allowable total power of the turbine stages when cooling steam flows into the flow part of the turbin e from the generator safety condit ion during its emergency disconnect ion from the network. Based on the thermal and balanceequat ions, acondit ion is obtained that excludes the possibility of external steam flows into the intermediate stages of the turbine affect ing the parameters of the steam flowing through the flow part