Combined with actual situation in thermal power plants

the objects for fault types

and fault diagnosis methods in thermotechnic control system for thermal power plants have been determined

the diagnosis methods based on signal analysis and data statistics being put forward for important sensors and actuators in the said system. Taking the superheat steam temperature control system of a 300MW unit as example

the diagnosis methods for breakage

gain

deviation

and overspeed faults of the sensors

as well as jam

hysteresisloop

and stickslip faults of the actuators have been studied. Finally

two fault diagnosis examples are given

the field diagnosis results show that the fault diagnosis methods recommended in this paper to be practical and feasible.