Generator ( boiler ) is very important equipment at thermal power units , Boiler is the steam supply for the unit to rotate the turbine's rotor , hence produce electricity at Generator's stator.

Boiler usually equipped with solar and Main gas firing equipments , and you can imagine that huge boiler disappear in seconds unless operator take his precaution from operation hazards., hence Boiler always equipped with a protection relays to trip the boiler out of service if hazards conditions has happened , these relays are enclosed at huge protection system is called ( Master Fuel Trip ).

From its name ( Master Fuel Trip ) , it produces trip signal for fuel systems from operation , then trip the boiler out of service away from danger. this relay needs many conditions to operate

MASTER FUEL TRIP , CONDITIONS :-

1-REHEATER PROTECTION2-DELAYED LIGHTING3-LOSS OF ALL FUEL INPUT4-DRUM LEVEL HI HI5-DRUM LEVEL LOW LOW6-ALL FD FAN STOP7-FURNACE PRESSURE HI HI8-CCS WATCHDOG ABNORMAL9-COMBUSTION AIR FLOW LOW LOW10-CONDENSER PROTECTION11-PARTIAL LOSS OF FLAME12-BOILER EMERGENCY TRIP13-LOSS OF ALL FLAME14-HP/LP BYPASS VALVE ABNORMAL CLOSE15-ALL FUEL TRIP DELAY TRIP