2×350 MW steam turbine DEH system of unit 1 and 2 of Liaoning Orient Power Co.
Ltd.are a closed-loop regulation which made up of adjusting valve position feedback signal
HSS03 and servo valve
inaccurate feedback due to improper adjustments or failure of position feedback sensors LVDT and servo card will bring threat to the safe operation of the unit.Several failure reasons of the LVDT position feedback sensor
servo card HSS03 and servo valve during the DEH run are analyzed.Adjustments and maintenance considerations of servo card and position feedback sensor LVDT are advanced and ensure the safe and stable operation of DEH system and implementation of the function from the source.