Main Equipments Tripped

S.No	Fault	Consequence	Actions
1	1 mill Tripped out of 6	Ø  Runback will Act Ø  Capability - 466 MW Ø  Machine Comes in IP mode	Ø  Reduce Load Ø  Observe Drum Level( will go up) Ø  Reduce Throttle Pressure SP Ø  Take another Mill
2	2 mills Tripped out of 6	Ø  Runback will Act Ø  Capability - 372 MW Ø  Machine Comes in IP mode	Ø  Reduce Load Ø  Observe Drum Level( will go up) Ø  Observe Flame Scanner Ø  If Necessary take Oil gun at an elevation Ø  Reduce Throttle Pressure SP Ø  Take another Mill
3	Any one ID Fan Trips	Ø  Runback will Act Ø  Unit Capability-300 MW Ø  Trip command to Respective FD Fan/ If not Tripped, Trip FD Ø  Only 5 mills will Remain , rest will trip from top/ If not tripped, Trip from top leaving only 5 mills Ø  Machine Comes in IP Mode	Ø  Observe Furnace Pressure Ø  Observe Total Air Flow Ø  Ensure Tripped FD Discharge Damper Closed Ø  Ensure running FD Fan current in limit Ø  Ensure Tripped ID Fan IGV closed on auto Ø  Observe Drum Level Ø  Observe Scanner Ø  Reduce throttle Pr SP Ø  Inform Maintenance for check
4	Both ID Fans Tripped	Ø  Unit will trip on MFT	Ø  Do shutdown Activities
5	Any one FD Fan Trips	Ø  Runback will Act Ø  Unit Capability-300 MW Ø  Trip command to Respective ID Fan/ If not Tripped, Trip ID Ø  Only 5 mills will Remain , rest will trip from top/ If not tripped, Trip from top leaving only 5 mills Ø  Machine Comes in IP Mode	Ø  Observe Furnace Pressure Ø  Observe Total Air Flow Ø  Ensure Tripped FD Discharge Damper Closed Ø  Ensure running FD Fan current in limit Ø  Ensure Tripped ID Fan IGV closed on auto Ø  Observe Drum Level Ø  Observe Scanner Ø  Reduce throttle Pr SP Ø  Inform Maintenance for check
4	Both FD Fans Tripped	Ø  Unit will trip on MFT	Ø  Do shutdown Activities
5	Anyone PA Fans Trip	Ø  Unit Capability-300 MW Ø  If PA Header comes to 625 mmWC and not increased within 5 Seconds, all Mills will Trip on PA Header Pressure Low and Unit will trip on Loss of All Fuel Ø  If PA Header comes to 500 mmWC, all Mills will Trip on PA Header Pressure Low and Unit will trip on Loss of All Fuel	Ø  Observe PA Header Pressure Ø  Ensure Discharge Damper of PA Fan got closed Ø  Observe Drum, Furnace, Total air flow Ø  Observe Flame Scanner, Take Oil gun in elevation if required Ø  Inform concerned Department for Tripping of Fan
4	Both PA Fans Tripped	Ø  all Mills will Trip on PA Header Pressure Low and Unit will trip on Loss of All Fuel(MFT)	Ø  Do shutdown Activities
5	Any1 BCW trips out of 2	Ø  Standby will come Ø  If standby BCW pump do not come, runback will Act Ø  Capability- 300 MW Ø  Only 5 mills will Remain , rest will trip from top/ If not tripped, Trip from top leaving only 5 mills	Ø  Inform Concerned /department for the Tripping Ø  Observe Drum level Ø  Observe Flame Scanner Ø  Observe running Pump DP
6	2 BCW pumps Trip	Ø  Standby BCW will come Ø  Runback will Act Ø  Only 5 mills will Remain , rest will trip from top/ If not tripped, Trip from top leaving only 5 mills Ø  If standby donot come, Boiler will trip on MFT due to Waterwall Circulation Incorrect	Ø  Observe Drum,Furnace, BCW DP, flame Scanner Ø  If unit trips, Follow the shutdown activities
7	Anyone SAPH Trips	Ø  Air Motor Comes in auto Ø  If air Motor do not come, runback will act Ø  Capability:300 MW Ø  Only 5 mills will Remain , rest will trip from top/ If not tripped, Trip from top leaving only 5 mills	Ø  Observe SAPH FG /Air Outlet Temperature Ø  Inform concerned deptt for Tripping of SAPH Ø  If air Motor does not come , Ensure Closing of SAPH FG & Air Inlet & Outlet dampers Ø  Observe Secondary air temperature at Windbox inlet
8	Both SAPH Trips	Ø  Air motor comes in auto Ø  Air motor do not come, Unit will trip on Both SAPH Tripped (MFT)	Ø  Observe SAPH FG /Air Outlet Temperature Ø  Inform concerned deptt for Tripping of SAPH Ø  If air motor do not come, Follow the shutdown activities
9	Anyone SAPH Trips	Ø  Air Motor Comes in auto Ø  If air Motor do not come,	Ø  Observe PAPH FG /Air Outlet Temperature Ø  Inform concerned deptt for Tripping of SAPH Ø  Ensure Closing of PAPH FG & Air Inlet & Outlet dampers Ø  Observe PAPH FG /Air Outlet Temperature Ø  Reduce load to 300 MW Ø  Keep 4/5 Mills in service Ø  Observe Mill Outlet temp
10	Both PAPH Trips	Ø  Air Motor Comes in auto Ø  If air Motor do not come,	Ø  Observe PAPH FG /Air Outlet Temperature Ø  Inform concerned deptt for Tripping of SAPH Ø  Try to restore at least one PAPH Ø  Take Maximum Oil guns Ø  Stop All Mills One by One, Stop PA Fan Ø  Observe Furnace Pr, Total air Flow, Reduce Throttle Pr SP Ø  Take MDBFP & Maintain Drum Level Ø  Load May get stabilized at 100 MW
11	Anyone TDBFP Trips	Ø  MDBFP will come in auto Ø  MDBFP do not come in 10 seconds, Runback will Act Ø  Unit Capability: 270 MW Ø  Only 4 mills will remain Ø  Machine will come in IP mode	Ø  MDBFP R/C Valve close on Auto, If not Close it Ø  Inform Concerned Deptt Ø  Ensure running TDBFP in auto, Drum Level in auto. Otherwise Increase Speed Reference Ø  Observe Difference b/w BLI and FW, If its still High, Reduce Coal flow Ø  Still Drum is not Rising, Trip 1 mill and take one oil gun Ø  Reduce Th Pr SP Ø  Inform concerned  Deptt
12	Both TDBFP trips	Ø  MDBFP comes in Auto Ø  Only 4 mills remains Ø  Machine comes in IP Mode	Ø  Increase MDBFP Scoop to maintain Drum Level. Close its r/c valve Ø  Still Drum is not Rising, Trip 1 mill and take one oil gun Ø  Reduce Th Pr SP Ø  Inform concerned  Deptt
13	Both TDBFP Trips	Ø  MDBFP does not come in auto Ø  Unit will trip on MFT(No BFP)	Ø  Do shutdown activities Ø  Inform concerned Deptt
14	Any 1 CEP Trips	Ø  Standby CEP comes in auto Ø  If  standby does not come , runback will act, Capability: 275 MW Ø  Only 5 mills will Remain , rest will trip from top/ If not tripped, Trip from top leaving only 5 mills Ø  Machine comes in IP Mode	Ø  Inform concerned Deptt Ø  Close D/A CV to raise CEP discharge Header Pr Ø  Observe D/A level Ø  Reduce Pressure SP
15	Both CEP Trips	Ø  Standby CEP comes in auto Ø  Only 5 mills will Remain , rest will trip from top/ If not tripped, Trip from top leaving only 5 mills Ø  Machine comes in IP Mode Ø  Standby CEP does not come in auto Ø  Only 5 mills will Remain , rest will trip from top/ If not tripped, Trip from top leaving only 5 mills Ø  Machine comes in IP Mode	Ø  Close D/A CV to raise CEP discharge Header Pr Ø  Observe D/A level Ø  Reduce Pressure SP Ø  Try to restore at least one CEP Ø  Trip Mills one by one & Reduce load < 100 MW Ø  Take one/two elevation guns Ø  Observe D/A , H/W and Vacuum Ø  Take MDBFP to maintain Drum Ø  Unit May trip on D/A Level Low, Vacuum if any of the CEPs cannot be revived