Thermal power units have implemented a series of transformation under the goals of “carbon neutrality and carbon peaking”. These transformation measures include: various measures for energy conservation and consumption reduction

the transformation of large flow heat supply and industrial steam extraction

flexible operation for thermal power units

and the adoption of AC series compensation and UHVDC transmission technology for long-distance transmission. With the implementation of these measures

the safety and reliability problems of steam turbine and auxiliary equipment become increasingly prominent. Based on the field cases and experiences

this paper systematically summarizes the mechanism and characteristics of typical faults

such as the shafting vibration of main and auxiliary equipment

rotor cracks and rotating parts fall off

vibration and corrosion of long turbine blades

stuck and vibration of steam inlet valve

and so on. Moreover

corresponding countermeasures are given to provide technical support for the safe and stable operation of thermal power units under the current situation.