In thermal power plants dc motors are employed for certain control and critical emergency operations which are supplied by dedicated batteries. DC motors operate as backup drives for normal ac drive systems when ac power supply to the plant is lost.

In thermal power plant, the dc motors finds applications for performing control functions such as

☛ Turbine governor motor

☛ Governor limit setting

☛ Motor operated rheostats

☛ Emergency lubrication for the turbines (main, boiler feed pumps)

☛ Generator (H2 oil seal).

☛ DC motor operated valves