Аннотация:
The article aims to contribute to the ongoing study of damage to steam turbine rotors resulting
from asynchronous connection of electric generators to the unified power system. At the present time,
the assessment of the residual life of steam turbine equipment is based on the study of the degradation
of the mechanical properties of steels and the analysis of the thermal stress state. The aim of this work
was to determine the impact of such vibrations on the mechanical properties of rotors and their damage.
This goal was achieved by solving the following tasks: developing a 3D model of the K-1000-60/3000
LMZ turbine unit shaft based on design documentation; calculating the stress-strain state of the shaft
resulting from asynchronous connections using finite element analysis; and evaluating the level of metal
damage in the rotors due to torsional vibrations. The developed mathematical model used a classical
approach, replacing the working blades and bandage fastenings with concentrated masses and moments
of inertia. The most important results are the calculated rotor damages that occur due to asynchronous
connection of the turbogenerator to the unified power system with a synchronization angle of 30°. The
greatest damage to the rotor metal was found in the shaft section between the steam turbine and the
electric generator. The significance of the results obtained is that the use of this data will improve methods for assessing the remaining life of turbogenerators. This, in turn, will improve the reliability and
safety of power plant operations.
