Turbine, Generator and Boiler Protections

I am going to share some basic but most important and precious informations with you. Here you will know the power plant main machins protections whch is very very important topic. you will be able to operate main plant safely as well as save human life loss. here you can know the main protection system such as Turbine, Generator and Boiler Protections.

TURBINE PROTECTIONS/TRIP

• Over speed trip device-1 
• Over speed trip device-1
•  Axial Shift vibrations
•  Manual trip device 
• Trip switch (desk) operated
• Trip switch (console) operated
• HPT exhaust temp high
• TG bearing metal temp trip 
• Condenser-1 press trip (VSP)
• Condenser-1 press trip (FSP)
• Condenser-2 press trip (VSP)
• Condenser-2 press trip (FSP)
• Fire protection switch
• Turbine Oil tank level too low
• Lube oil pressure trip
• Low MS temp trip
• Trip command from ATRS
• Gen electrical protection
• Gen mechanical protection
• Master fuel trip relay
• HP casing temp diff Top-Bottom
• IP front temp diff Top-Bottom
• IP rear temp diff Top-Bottom
• Reverse power protection scheme
• Shaft vibration too high

BOILER PROTECTION/TRIP

• Both ID fans OFF
• Both FD Fans OFF
• Emergency trip PB Ch-1
• Furnace pressure very high
• Furnace pressure very low
• RH protection trip
• Drum level very high
• Drum level very low
• Secondary air heater OFF
• BFP tripped
• Water wall circulation low
• 24V DC loss
• Air flow low
• Flame fail trip
• Loss of all fuel trip

GENERATOR PROTECTION/TRIP

• Distance protection (back up impedance trip)
• Stator earth fault protection (95% and 100%)
• Local breaker back up protection
• Negative phase sequence protection
• Dead machine protection
• Over Voltage protection
• Over fluxing protection
• Loss of excitation protection
• Low forward power protection
• Reverse power protection
• Out of step pole slipping protection
• Under frequency protection
• Inter-turn fault protection
• Over all differential protection
• Generator Transformer protection
• Unit transformer protection
  

The high and low values is depends on your plants.