7/28/2019 Boiler Protection

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BOILER TRIP PROTECTION

MASTER FUEL TRIP PROTECTIONS:

SLNO

PARAMTR TRIPCONDN ALARMTRIP TIME

DELAY REMARKS

1 Both ID Fans OFF -- -- -- 3 hardwired contacts foreach ID fan (2/3) (HTSwitchgear)

2 Both FD Fans OFF -- -- -- 3 hardwired contacts foreach FD fan (2/3) (HTSwitchgear)

4 UCP: EMG PB MFT1and MFT 2

Pressedtogether

-- -- --

5 Any OWS: EMG trip

command

Initiated &

Confirmed

-- -- --

6 Furnace Pressure V LO -100 -175 -- 2/3 Pressure Switches

7 Furnace Pressure V HI +75 +150 -- 2/3 Pressure Switches

8 Drum Level V LO -125 -225 5 sec 2/3 Transmitter

9 Drum Level V HI +125 +225 10 sec 2/3 Transmitter

10 Total Air Flow V LO -- 540rpm) < -0.7 kg/cm

04. Lub Oil pressure very low 2/3. < 1.2 kg/cm

05. HP exhaust steam temp. Very high 2/3. > 450oC

06.Axial shift Very high 2/3.

>

.5 mm

07. Cold gas temp. after H2 cooler high AB 2/3. > 55oC

08. Cold gas temp. after H2 cooler CD 2/3. > 55oC

09. Seal oil temp. after cooler high 2/3. > 55oC

10. Liquid level in main leads high 2/3. > 90 mm

11. Hot air temp. exciter high 2/3. > 85oC

12. Turbine / Generator brg Temp >90 deg / > 130 deg

13. ATRS Trip

14. Over Speed Trip >3210 rpm

15. Boiler trip to Turbine trip. -

16. Generator trip to Turbine trip. -

17. MOT level very low (2/3) (Through Fire Protectionlogic)

< 1050 mm