interlocks & protections-ntpc

8/22/2019 Interlocks & Protections-NTPC

1/87

PLANT INTERLOCK AND PROTECTIONStage II ( 2 x 500 MW )

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Sn Protection & Interlocks Sn Protection & Interlocks S

n

Protection &

Interlocks

1 MFT 21 AC SCANNER FAN 41 SEAL OIL INT & PROT

2 Loss of Flame Trip 22 COAL MILL 42 TURBOVISORY LIMITS

3 Unit Purging 23 COAL FEEDER 43 CASING TEMP. LIMITS

4 Lossof Reheater Protection 24 SECONDARY APH 44 DIFFERENT LEVELS5 WaterWall Circuit

Incorrect

25 PRIMARY APH 45 OTHERS TG ALARMS

6 Light OilTrip v/v 26 BCW 46 COMPRESSOR7 Heavy Oil Trip v/v 27 MILL RELATED

PARAMETERS

47 FIRE FIGHTING

SYSTEMS8 HONV & LONV 28 BCW CW BOOSTRPP 48 PT CW

9 Atomising Steam & Air

Nozzle valves

29 MILL DAMPERS &

GATES

49

10 HORV & Scavg NV 30 CW PUMP 50

11 SADC 31 ACW PUMP 51

12 PRDS 32 ECW (SG) 52

13 HP BYPASS 33 ECW (TG) 53

14 HPBP OIL UNIT 34 ECW TANK 5415 LP BYPASS 35 CEP 55

16 LDO / HFO / ATOM AIR &

STEAM PR. AND TEMP.36 MD BFP 56

17 ID FAN 37 TD BFP 57


2/87


18 FD FAN 38 TG PROTECTION 58

19 PA FAN 39 TG LUB OIL INT & PROT 59

20 SEAL AIR FAN 40 HPCF INT & PROT 60


3/87


HOME

1. MASTER FUEL TRIP PROTECTIONS:SL

NO

PARAMTR TRIPCONDN

ALARM

TRIP TIME

DELAY

REMARKS

1 Both ID Fans OFF -- -- -- 3 hardwired contacts for each ID fan

(2/3)

2 Both FD Fans OFF -- -- -- 3 hardwired contacts for each FD fan(2/3)

3 Water wall Circulation Incorrect 5 sec

4 UCP: EMG PB &

Release

Pressed

together

-- -- --

5 Any OWS: EMG trip

comd

Initiated &

Confirmed

-- -- --

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

7 Furnace Pressure V HI -- 2/3 Pressure Switches

8 Drum Level V LO 5 sec 2/3 EWLI

9 Drum Level V HI 10 sec 2/3 EWLI

10 Total Air Flow V LO -- < 30% Flow Transmitters

11 Loss of Reheat Protn Acted -- -- 10 sec Arming:

12 Unit 220V DC Not Avlbl 2 sec 220V DC for LOTV/ HOTVsolenoids

13 Unit 24V DC

(FSSS internal)

Not Avlbl -- -- -- 24V for MFT Panel

Hardwired trip14 Less than FB & loss ofAC in any elevn i/s

Loss of110V AC

-- -- 2 sec 110V AC for nozzle valve solenoidsArming: All feeders off

15 Unit Flame Failure

Trip

Activated -- -- -- Arming: Any feeder proven

16 Loss of All Fuel Trip Activated -- -- -- Arming: Any LO/HO nozzle valve


4/87


not closed

17 Both SAH OFF -- -- 5 sec for

indiv

SAH

SAH OFF = Main mtr OFF & Air pr

Low

18 All BFP OFF 10 sec

NOTE: All Trip Conditions are individually sensed by each MFT panel.

Final 2/3 Logic for Master Fuel Trip is hardwired in Purge Panel.

WATERWALL CIRCULATION INCORRECT

SN PARAMETER TRIP CONDN ALARM VAL TRIP VAL REMARKS

1 All BCWP OFF & Boiler working 5 sec

2 All Three BCWP ON & Each DP < 10psi None

3 Any Two BCWP ON & Both DP < 10psi 5 sec4 Any One BCWP ON & Its DP < 10psi 5 sec

HOME

LOSS OF REHEATER PROTECTION (Arming: )


1 Gen. CB Opened & HPBP or LPBP Closed -- --

2 Turbine HP v/v & HPBP Closed -- --

3 Turbine IP v/v & LPBP Closed -- --

LOSS OF ALL FUEL TRIP (Arming: Any Nozzle valve Not closed)

Note: All conditions to be satisfied for trip


5/87



(1. All feeders Off AND2. LOTV Not Open OR All AB all LONV

Closed OR Elevation AB Backup Trip AND

3. HOTV Not Open OR all HO Elevation

HONV Closed. )

OR

ALL Elevation Backup Trip.

* loss of all fuel Trip Arming is done when any elevation any nozzle valve not closed signal becomes true.

UNIT FLAME FAILURE TRIP (Arming: Any Feeder proven)

SN PARAMETER TRIP CONDN

ALARM

VAL TRIP VAL

REMARKS

Any Feeder proven & All Elevation A-K Votedno flame **

** No flame VOTING LOGIC For Elevation A

1. Feeder A STOP For More Than 4 sec or2. EL AA FB No flame & any of the

conditions below2.1 EL AB Start And Loss of AC Power OR

2.2 EL AB 2/4 Nozzle V/V Not Proven &

Elevation AB FB 3 / 4 No flame.

-- --


6/87


HOME

LESS THAN FIREBALL OR LOSS OF AC IN ANY ELEV IN SERVICE

SN PARAMETER TRIP CONDNALARM

VAL TRIP VALREMARKS

1. All Feeders Off &

2. Any Oil Feeders Start Memory Active &

AC Power NA ( TD 2 sec)

-- --

FSSS : PURGE PERMISSIVES:

S.

No

PARAMETER REQ. STATUS SET

VALUE

REMARKS

All PA Fans OFF --

HOTV Closed --

All Elevations All HONV Closed --

LOTV Closed --

AB Elevation All LONV Closed --

All Feeders OFF --

All Hot Air Gates Closed --

All Elevations Discr

Scanners

No Flame --

All Elevations Fireball

Scanners

No Flame --

All Auxiliary Air Dampers Modulating Taken from inlet pressure switches for eachdamper

Total Air Flow > 30%

< 40%

> Tph

< Tph

100% = Total Air Flow at MCR =

Tph


7/87


No Boiler Trip: all 3 MFT

ch-A,B,C (No MFT as

given in 2)

True MFT condition not present (but

MFT Not reset)

NOTE: Purge Timer = 9 minutes, Post-Trip Purge Timer = 5 minutes.


8/87


HOME

LIGHT OIL TRIP V/V :

LIGHT OIL TRIP VALVE LIGHT OIL ELEVATION

OPENING PERMISSIVES:

1.Unit 24 V DC Poweravailable

2.No close PB command3.Open PB command Yes4.LO Supply Pressure OK

> 14.5 kg/cm2

5.El AB All LONV closedNo Auto Closing Conditions

Present.

7. NO MFT

AUTO CLOSING

CONDITIONS:

LO Hdr. Pr.V Low (


9/87


1. HO Supply PressureAdequate > 16 kg/cm2 &

2. HO Supply Temperature

Adequate > 120 C &3.No MFT &

4.All Elevation HONV Closed

&5.No closing Command from

APS or MMI &

6.No Auto Closing conditions

7.Above Conditions orcondition

below 8-9 & 24 V Power

available

8. HO Recirculation ValveOpen

&9. No Auto OR Manual close

commands.

CONDITIONS:

1.HO Hdr. Temp. V Low

& any HONV not

closed


10/87


HOME

HEAVY & LIGHT OIL NOZZLE V/VS :

HEAVY OIL NOZZLE VALVE LIGHT OIL NOZZLE VALVE


1. Atom steam valve open &

2. No scavenging &

3. (HONV not open or scanner

shows flame)4. 24 V DC power available &

5. Atomising steam nozzle

valve auto close conditions

not present.

AUTO CLOSING

CONDITIONS:

1.Atom steam auto closingconditions present or

2.MFT operated or3.Scavenging on or

HONV not operated and

disc. Scanner show noflame

OPENING

PERMISSIVES:

Atomising Air Nozzle valve

open &AA Nozzle Valve No Auto

closing conditions &

(LONV not open or Scannershows flame ) &

Scavenging not on &

24 V DC Power SupplyAvailable

HO not selected.

AUTO CLOSING

CONDITIONS:

1.Scavenging Mode on or2.LONV Not closed & No

Flame Conditions for10sec OR

3.MFT Operated OR

AA Nozzle valves autoclose conditions present

ATOMISING STEAM AND AIR CORNER V/VS :

ATOMISING STEAM NOZZLE VALVE ATOMISING AIR NOZZLE VALVE


1.HEA Rod advanced &

AUTO CLOSING

CONDITIONS:

OPENINGPERMISSIVES:

AUTO CLOSING

CONDITIONS:


11/87


2 Oil Gun Engaged &

3.Heavy Oil Corner Start. &

conditions 4-7

4.HO Manual Isolating Valve

Open & EL HO Selected &5. Atom Steam Manual

Isolating Valve Open6. Scavenge Nozzle valve

closed &

7. LGM switch in remote8. Above conditions & No

auto

closing conditions or

9. HONV closed &10. No auto closing

conditions

present &11. LGM in Scavenge or

corner stop time not

elapsed

12. Above condition 11 &Scavenge incomplete.

1.LGM off or Oil Gun notEngaged or BU Trip or

2.Atom stream manual

isolating valve not open

or3.Elevation AB LO selected

or4.HO manual isolating

valve not open or

conditions below5.No scavenge and corner

start time elapsed &

6.HO or Atom steamNozzle valve not open or

disc. Scanner show no

flame

1.HEA Rod advanced &2.Oil Gun Engaged. &

3.El AB LO Selected &

light oil corner start &4.Manual Isolation valve

for LO & AA Open &5.Scavenge Nozzle Valve

Closed &

6.No auto ClosingConditions.

Above conditions or

7.LONV closed &8.EL AB LO selected &

Scavenging ON & No

Auto closing conditions

present

. AA Manual Isolatingvalve not open or

. LO manual isolating valve

not open or

. EL AB HO selected or

. EL AB back up trip or

. LGM in off or

. Oil Gun Not Engaged or

. LO Corner Start timeexpired & conditions 8

below

. EL AB LO Selected andscavenge not on & any of

the conditions at 9-11. Scanner Show no flame or0.LO Nozzle valve not open

or1.Atom Air Nozzle valve

not open.

HOME


12/87


HEAVY OIL RETURN VALVE AND SCAVENGE NOZZLE VALVE:

HEAVY OIL RETURN VALVE SCAVENGE NOZZLE VALVE


1. All Elevation NozzleValve Closed &

2. No Master Fuel TripOperated &

3. No auto Closing conditions

AUTO CLOSING

CONDITIONS:

1.Any Elevation NozzleValve Not closed or

2.Master Fuel trip operated.

OPENING

PERMISSIVES:

Atomising steam valve open

&

Atomising steam auto closeconditions not present &

No auto closing conditions

present & conditions at 4-6

HONV closed &

Atomising steam auto

closing conditions notpresent &

Scavenge incomplete &

(LGM in scavenge orcorner Stop Time)

AUTO CLOSING

CONDITIONS:

1. Scavenging not on or anyof the following

conditions

2. LGM in off position or3. Oil Gun not Engaged or

4.Back up Trip


13/87


HOME

LDO / HFO / ATOMISING AIR & STEAM PRESSURE AND TEMP.

S.

N

PARAMETER REQ.

STATUS

SET VALUE REMARKS

LDO :

1 LDO pump discharge Header pr. low Low 17.5 Ksc falling Discharge Hdr. At FOP/p house.

2 LDO pump S/B pump auto start Low 17.0 Ksc falling Discharge Hdr. At FOP/p house.

3 LDO header pressure OKpermissive

Normal 14.0 Ksc At firing floor

4 LDO header pressure low alarm. Low 3.5 Ksc falling At firing condition of AB-4

corners

5 LDO header pressure low Trip LoLo 3.0 Ksc falling At firing condition of AB-4

corners6 Atomising Air hdr. Pr. Low alarm Low 4.0 Ksc falling At firing condition of AB-4

corners

7 Atomising Air hdr. Pr. Low Trip LoLo 3.5 Ksc falling At firing condition of AB-4

corners

8 LDO suction strainer chocked

alarm

DP high 0.35 Ksc At FOP/P house & firing

floor.

9 LDO tank level low alarm Low - 1.85 falling

10 LDO tank level High alarm High - 0.75 rising

HFO :

1 HFO pump discharge Header pr. low Low 29.0 Ksc falling Discharge Hdr. At FOP/p house.

2 HFO pump S/B pump auto start Low 28.5 Ksc falling Discharge Hdr. At FOP/p house.

3 HFO pump discharge Header pr. high High 30.0 Ksc rising Discharge Hdr. At FOP/p house.

4 HFO header pressure OKpermissive

Normal 23.0 Ksc At firing floor befor strainer

5 HFO header pressure low alarm. Low 5.0 Ksc falling At firing condition after Flow


14/87


CV.

6 HFO header pressure low Trip Lo Lo 4.0 Ksc falling At firing condition after Flow

CV.

7 Atomising Steam hdr. Pr. Lowalarm Low 4.0 Ksc falling At firing condition afterASPRV

8 Atomising Steam hdr. Pr. Low

Trip

LoLo 3.5 Ksc falling At firing condition after

ASPRV

9 HFO header Temp. OK

permissive

Normal 120 oC At firing floor befor strainer

10 HFO header Temp. Low alarm Low 115 oC At firing condition after Flow

CV.

11 HFO header Temp. Low Trip LoLo 105oC At firing condition after Flow

CV.

12 HFO pump suct. strainer chocked

alarm

DP high 0.35 Ksc At FOP/P house pump

suction.13 HFO pump dish. strainer chocked

alarmDP high 0.70 Ksc At HFO heater.

14 HFO dish. strainer chocked alarm DP high 0.70 Ksc At firing floor strainer

START / OPEN PERMISSIVES TRIP / CLOSE

LIGHT OIL TRIP V/V ( LOTV )

1 Unit 24 V DC Power Available 1 LDO Hdr. Pr.V Low (< 3.0 Ksc) & EL AB any

LONV not closed ( TD 5 sec)

2 No close PB command 2 Atomising Air Pr. V Low < 3.5 kg/cm2 ( TD 5 s&EL AB any LONV not closed & No LDO Start

stop in

EL AB.

3 Open PB command Yes 3 Master Fuel Trip Operated 2/3 Logic


15/87


4 LDO Supply Pressure OK > 14.0 kg/cm2 4 Loss of unit +24V power supply

5 El AB All LONV closed

6 No Auto Closing Conditions Present.

7 NO MFTHEAVY OIL TRIP V/V ( HOTV)

1 HO Supply Pressure Adequate > 16 kg/cm2 1 HO Hdr. Temp. V Low & any HONV not

closed 120 C 2 HO Hdr. Temp. V Low & any HONV not

closed


16/87


HOME

LDO / HFO / ATOMISING AIR & STEAM PRESSURE AND TEMP.

S.

N

PARAMETER REQ.

STATUS

SET VALUE REMARKS

LDO :

1 LDO pump discharge Header pr. low Low 17.5 Ksc falling Discharge Hdr. At FOP/p house.

2 LDO pump S/B pump auto start Low 17.0 Ksc falling Discharge Hdr. At FOP/p house.

3 LDO header pressure OKpermissive

Normal 14.0 Ksc At firing floor

4 LDO header pressure low alarm. Low 3.5 Ksc falling At firing condition of AB-4 corners

5 LDO header pressure low Trip LoLo 3.0 Ksc falling At firing condition of AB-4 corners

6 Atomising Air hdr. Pr. Low alarm Low 4.0 Ksc falling At firing condition of AB-4 corners

7 Atomising Air hdr. Pr. Low Trip LoLo 3.5 Ksc falling At firing condition of AB-4 corners8 LDO suction strainer chocked

alarm

DP high 0.35 Ksc At FOP/P house & firing floor.

9 LDO tank level low alarm Low - 1.85 falling

10 LDO tank level High alarm High - 0.75 rising

HFO :

1 HFO pump discharge Header pr. low Low 29.0 Ksc falling Discharge Hdr. At FOP/p house.

2 HFO pump S/B pump auto start Low 28.5 Ksc falling Discharge Hdr. At FOP/p house.

3 HFO pump discharge Header pr. high High 30.0 Ksc rising Discharge Hdr. At FOP/p house.

4 HFO header pressure OKpermissive

Normal 23.0 Ksc At firing floor befor strainer

5 HFO header pressure low alarm. Low 5.0 Ksc falling At firing condition after Flow CV.

6 HFO header pressure low Trip Lo Lo 4.0 Ksc falling At firing condition after Flow CV.

7 Atomising Steam hdr. Pr. Lowalarm

Low 4.0 Ksc falling At firing condition after ASPRV

8 Atomising Steam hdr. Pr. Low LoLo 3.5 Ksc falling At firing condition after ASPRV


17/87


Trip

9 HFO header Temp. OK

permissive

Normal 120oC At firing floor befor strainer

10 HFO header Temp. Low alarm Low 115

o

C At firing condition after Flow CV.11 HFO header Temp. Low Trip LoLo 105 oC At firing condition after Flow CV.

12 HFO pump suct. strainer chocked

alarm

DP high 0.35 Ksc At FOP/P house pump suction.

13 HFO pump dish. strainer chocked

alarm

DP high 0.70 Ksc At HFO heater.

14 HFO dish. strainer chocked alarm DP high 0.70 Ksc At firing floor strainer

START / OPEN PERMISSIVES TRIP / CLOSE

LIGHT OIL TRIP V/V ( LOTV )

1 Unit 24 V DC Power Available 1 LDO Hdr. Pr.V Low (< 3.0 Ksc) & EL AB anyLONV not closed ( TD 5 sec)

2 No close PB command 2 Atomising Air Pr. V Low < 3.5 kg/cm2 ( TD 5 sec )

EL AB any LONV not closed & No LDO Start / sto

EL AB.

3 Open PB command Yes 3 Master Fuel Trip Operated 2/3 Logic

4 LDO Supply Pressure OK > 14.0 kg/cm2 4 Loss of unit +24V power supply

5 El AB All LONV closed

6 No Auto Closing Conditions Present.

7 NO MFT

HEAVY OIL TRIP V/V ( HOTV)1 HO Supply Pressure Adequate > 16 kg/cm2 1 HO Hdr. Temp. V Low & any HONV not closed

120 C 2 HO Hdr. Temp. V Low & any HONV not closed


18/87


3.5Ksc & No HO Start/Stop in any elevation

4 All Elevation HONV Closed 4 Master Fuel Trip Operated 2/3 Logic

5 No closing Command from APS or MMI 5 Close command from APS logic or ManualCommands.

6 No Auto Closing conditions 6 Loss of unit +24V power supply

7 HO Recirculation Valve Open

8 No Auto OR Manual close commands

9 Unit 24 V DC Power Available

HEAVY OIL RETURN V?V ( HORV )

1 All Elevation Nozzle Valve Closed 1 Any Elevation Nozzle Valve Not closed

2 No Master Fuel Trip Operated 2 Master Fuel trip operated 2/3 Logic

3 No auto Closing conditions


19/87


HOME

SECONDARY AIR DAMPER CONTROL:

AUX. AIR DAMPER OPEN CONDITION: (APPLICABLE TO AB,BC,CD,DE, EF,FG,GH,HJ,JK, KK)

1. * Open command from FSSS OR2. Furnace to WB DP 30 %4. EL AB back up trip5. Close command for HEA Ignition Permit* Once the Boiler Load Reaches > 30% the aux air dampers close in a timed sequence starting from top with a t ime delay of 10

Sec provided all other conditions for closing are satisfied.

FUEL AIR DAMPERS (A-K) & OFA DAMPER OPENING CONDITIONS:

1. MFT Operated Or 2/3 Volting

2. Either both ID OR both FD Fans are off

*The opening command is removed once the post purge time has expired and all opening conditions are removedinstantaneously for fuel air dampers F-K and for A-E with 30 sec time delay. The close command is extended with a time delay

of 50 sec after the corresponding feeder is out of service.


20/87


HOME

PRDS

MS PRDS ISO VLV ASV 21

Open Permissive: ASV- 21 integral bypass valve LS open feedback

Auto Open:1. MS PRDS Pr. Control valve ASV-22 demand > 2 % AND

2. AS21 intergal bypass valve LS open feedback

Auto Close:

1. MS PRDS control valve ASV- 22 open feedback >2%

Protection CloseHT PRDS Temperature V High > 373 C ORLT PRDS Temperature V High > 280 C

MS PRDS ISO IBV ASV 21 IBV

Auto Open: MS PRDS control valve ASV-22 demand > 2%

Auto Close: MS PRDS Isolation valve ASV-21 Open

Protection CloseHT PRDS Temperature V High > 373 C OR

LT PRDS Temperature V High > 280 C

MS PRDS PR CONTROL VLV ASV 22

Auto Close:


21/87


HT PRDS Temperature V High > 373 C OR


LT PRDS ISO VLV ASV 25

Auto Open: LT PRDS control valve Asv-25 demand > 2%

Auto Close: LT PRDS control valve ASV-26 Open feedback 373 C ORLT PRDS Temperature V High > 280 C

LT PRDS Main Control VLV ASV 26

Auto Close:HT PRDS Temperature V High > 373 C ORLT PRDS Temperature V High > 280 C

HOME

LT PRDS CBV BYP VLV ASV=28

Close permissive: CRH PRDS BP control valve ASV-29 Limit switch FB close with 1 min. delay

Protection CloseHT PRDS Temperature V High > 373 C OR


LT PRDS BP Spray Water ISO VLV FDV- 37

Auto Close:1. Spray BP valve FDV- 38 LS FB close ( 1min delay) AND

2. Spray BP valve FDV- 39 LS FB close ( 1min delay)


22/87


HT PRDS Spray Water ISO VLV FDV- 29

Auto Open: MS PRDS control valve ASV-22 demand > 2%Auto Close: MS PRDS control valve ASV-22 demand AND position feedback 2%

Auto Close: ASV- 22 AND ASV- 26 demand AND feedback 2% (5 sec delay)Forced Auto:

MS PRDS control valve ASV-22 demand > 2%

LT PRDS main Temp control VLV FDV- 35

Auto Close:i. LT PRDS control valve ASV-26 demand > 2% (5 sec delay) AND

ii. LT PRDS control valve ASV-26 demand & position < 2% (5 min delay)Forced Auto:

i. MS PRDS control valve ASV-22 demand > 2% ORii. LT PRDS control valve ASV-26 demand & position > 2% OR

iii. HT PRDS Pr. AND Temp demand adequatePr. > 14.4 ksc Temp > 275 C

HT PRDS Spray Water Pr. control VLV FDV- 31


23/87


Auto Close:

MS PRDS control valve ASV-22 demand > 2% (5 sec delay) &Forced Auto:

MS PRDS control valve ASV- 22 demand > 2%

LT PRDS Spray Water Pr. control VLV FD 34

Auto Close:i. MS PRDS control valve ASV-22 demand > 2% (5 sec delay) AND

ii. LT PRDS control valve ASV-26 demand & position < 2% (5 sec delay)Forced Auto:

i. MS PRDS control valve ASV-22 demand > 2% ORii. LT PRDS control valve ASV-26 demand & position > 2%

APRDS ALARMS

1. HT PRDS Header Pressure Low < 9Kg/cm2

2. HT PRDS Header Pressure Low < 9Kg/cm2

3. HT PRDS Header Temperature Low < 334 C

4. HT PRDS Header Temperature High > 336 C5. HT PRDS Header Temperature V Low > 373 C

6. LT PRDS Header Temperature Low < 204 C7. LT PRDS Header Temperature High > 230 C

8. LT PRDS Header Temperature V High > 280 C

OIL SUPPLY PUMP FOR HP BYPASS:

1. Pump off: >156Kg/cm2


24/87


2. Pump on: 160 Kg/cm24. Pressure too low 8 Kg/cm26. Any one of the above & No. Priority close

BY PASS PRIORITY CLOSE CONDITIONS:1. Condenser vacuum low 480C

BP VALVE AUTO BLOCKING CONDITIONS:

1. BP Valve Priority Closed Command2. BP Valve Position Transmitter failed

3. OSU-1 & OSU-2 Oil Pressure Very Low4. MSL PR TX Disturbed

BD VALVE AUTO OPEN CONDTIONS:1. BP Valve PI demand >2% or

2. BP-1 Or BP-2 Valve open >2%

BD VALVE AUTO CLOSE CONDITIONS:


25/87


1. No auto open command

2. BD valve LS FB Open

BPE VALVE AUTO BLOCKING CONDITIOS:

1. BPE both DS Temp Signal disturbed2. BPE Valve Position TX failed3. BP-1 Auto Command blocking yes4. BPE-1 Temp TX Deviations high

LP BYPASS SYSTEM:

LP Bypass Protections1. LP Bypass Reset Trip SOV Protection valve will act at condenser wall temp > 90 deg C2. CEP spray water pressure low

Bypass Alarms1. Steam Temperature after LP Bypass valve High > 90C

2. Injection water valve open command will be issued at steam pressure before bypass valve 1 & 2 > 6.8 ksc


26/87


HOME

ID FAN :

ID FAN VFD CHANNEL-1 DRIVE START PERMISSIVES:

Sl

No

PARAMETER REQUIRED

STATUS

SET VALUE REMARKS

1 Ch-1 SRC Breaker Not Disturbed --

2 Ch-1 SRC Breaker ON --

3 Ch-1 SRC Breaker Available --

4 VFD Ch-1 No Alarm --

5 VFD Ch-1 Ready --

6 VFD Ch-1 Start Permissive Available --

7 Ch-1 No Fault --

8 VFD System Aux Supply OK --9 Reg. Damper Pos Min & I/L Gates Closed & O/L Gates Closed (OR) ID Fan VFD Ch-2 ON

10 Either LOP (A or B) ON --

11 ID Fan Exciter Winding temp Not HI 0.8 ksc

13 Fan/Mtr Brg temp. Not HI


27/87


2 Ch-2 SRC Breaker ON

3 Ch-1 SRC Breaker Available --

4 VFD Ch-2 No Alarm

5 VFD Ch-2 Ready

6 VFD Ch-2 Start Permissive Available

7 Ch-2 No Fault

8 VFD System Aux Supply OK --

9 Reg Damper Pos Min & I/L Gates Closed & O/L Gates Closed (OR) ID Fan VFD Ch-1 ON

10 Either LOP (A or B) ON

11 ID Fan Exciter Winding temp Not HI 0.8 ksc

13 Fan/Mtr Brg temp Not HI 130 deg C

5) Fan/Mtr Brg

Vibration

V HI > 10 mm/s

6) Exciter Wdg temp V HI >105 deg C

7) IDF-A Post Purge TRIP /FSSS


28/87


8) Fan ON* for sec & Disch damperCLSD

2min 30 sec *VFD Ch-1or 2 min

speed achieved

9) Fan ON* for sec & I/L gate CLSD 2min 30 sec *VFD Ch-1or 2 minspeed achieved

10) Both ID and both FD ON & FD-Atrip

FD to ID inter trip

VFD CHANNEL-2TRIP PROTECTIONS:

SL

NO

PARAMTR TRIPCONDN

ALARM TRIP REM

SET VAL SET VAL

1) VFD Ch-2 FAULT /VFD

2) Ch-2 SRC Breaker Elect Trip

3) Fan/Mtr Brg temp V HI > 90 deg C

4) Mtr Wdg temp V HI >130 deg C5) Fan/Mtr Brg

Vibration

V HI > 10 mm/s

6) Exciter Wdg temp V HI >105 deg C

7) IDF-A Post Purge TRIP /FSSS

8) Fan ON* for sec & Disch damper

CLSD


speed achieved

9) Fan ON* for sec & I/L gateCLSD


speed achieved

10) Both ID and both FD ON & FD-A

trip

FD to ID intertrip

ID FAN LOP-A:

Sl

No

PARAMETER REQUIRED

STATUS

SET VALUE REMARKS


29/87


START PERMISSIVES

1) Lub Oil Tank Lvl NOT LO

AUTO STARTOther LOP TrippedID Fan Group Control Select LOP-A Commd

ON

STOP RELEASE

1) ID Fan OFF 30 min. delay

2) IDF-A LOP:B- ON & Lub Oil Pr OK ( > 0.8ksc)

AUTO STOP

1) ID Fan Group Control Select LOP-A CommdOFF

ID FAN LOP-B:

Sl

No

PARAMETER REQUIRED

STATUS

SET VALUE REMARKS

START PERMISSIVES

2) Lub Oil Tank Lvl NOT LO

AUTO STARTOther LOP TrippedID Fan Group Control Select LOP-B Commd

ON

STOP RELEASE

3) ID Fan OFF 30 min. delay4) IDF-A LOP:A- ON & Lub Oil Pr OK ( > 0.8

ksc)

AUTO STOP

2) ID Fan Group Control Select LOP-B Commd


30/87


OFF


31/87


HOME

FD FAN :

START PERMISSIVES:

Sl

No

PARAMETER REQUIRED

STATUS

SET VALUE REMARKS

Motor winding temperature Not high

Fan/ motor bearing temperature Not high

Lub oil pressure OK > 0.8 ata

Control oil pressure OK > 8.0 ata

Lub oil cooler outlet temp Not high

Any LOP ON

Lub oil tank level Not low

Impeller position Min & Manual

Fan outlet damper Closed

Switchgear Available

Switchgear Not disturbed

Both ID Fans Through* (or) Any ID FanThrough*

and Other FD Fan OFF

*Through = Both I/L gates open &Both O/L gates open & Fan ON

TRIP PROTECTIONS:

SNO PARAMTR TRIP CONDN ALARM VAL TRIP VAL REM

11) FDF-A elect. protection Acted

12) FDF-A Post purge Trip13) FDF-A fan/ motor bearing

temp.

V high

14) FDF-A motor winding temp. V high

15) FDF-A fan/ motor vibration V high


32/87


16) Both ID Fans OFF

17) Both FD Fans ON (and) IDF-A OFF

18) FDF-A ON (and) Outlet gate Closed T2 min T1 min (>T2)

FD FAN LOP-A:

S

NO

PARAMETER REQ.

STATUS

SET VALUE REMARKS

START PERMISSIVES

3) FD Fan Lub Oil Tank Level Adequate

AUTO STARTOther LOP Tripped LOP was running &OFF status appeared

without manual OFF command.

Other LOP ON &

Cont Oil Pressure LO (time

delay)

< 5 ata

STOP RELEASE

5) FD Fan OFF

6) Other LOP ON & Lub Oil Pr OK ( > 0.8 ksc) & Control Oil Pr OK( > 8 ksc)

AUTO STOP

3) FD Fan Group Control Select LOP A Commd OFF

FD FAN LOP-B:

Sl

No

PARAMETER REQ. STATUS SET VALUE REMARKS

START PERMISSIVES

4) FD Fan Lub Oil Tank Level Adequate

AUTO STARTOther LOP Tripped LOP was running & OFF status appeared

without manual OFF command

Other LOP ON &


33/87


Cont Oil Pressure LO (time

delay)

< 5 ata

STOP RELEASE

7) Other LOP ON & Lub Oil Pr OK ( > 0.8 ksc) &Control Oil Pr OK (

> 8 ksc)

AUTO STOP

4) FD Fan Group Control Select LOP-B Commd OFF

FAN DISCHARGE DAMPER:

Sl

No

PARAMETER REQUIRED

STATUS

SET VALUE REMARKS

PROTECTION OPEN:

5) Both FD Fans OFF 15 min pulse

AUTO OPEN:

FD Fan ON for (T sec)AUTO CLOSE: (Permissive: FD Fan OFF)

8) Other FD Fan ON &Other FD Fan Outlet Damper Open &

FD Fan OFF

HOME

PA FAN1 Start Permissive 1. Fan Lube Oil Pressure Adequate >0.8kg/cm2

2. Fan Motor Winding Temp not High


34/87


8. Both FD FAN On Or(Either FD FAN On & Other PA FAN Off)

9. Fan Switchgear Available10. No Disturbance From Switchgear11. Fan Lube Oil Cooler O/L Temp. not High 90Civ. Fan Brg. Temp. Very High (TD 5 Sec) >110Cv. Fan Motor Winding Temp V High (TD 5 Sec) >125C

vi. Fan/Motor Vibration V High (TD 5 Sec) > 9 mm/svii. MFT Operated

SEAL AIR FAN1 Auto Start

ConditionsEither PA Fan On & SA HDR/Cold PA Duct Low ( TD 10Sec)


35/87


SECONDARY APH :

SAH ELECTRICAL MOTOR

Sl

No

PARAMETER REQUIRED

STATUS

SET

VALUE

REMARKS

ON RELEASE:SAH GB oil temp Not V.HI


36/87


SAH SUPPORT Brg. LOP

Sl

No

PARAMETER REQUIRED

STATUS

SET

VALUE

REMARKS

ON RELEASE:SB oil temp Adequate >35

oC

AUTO ON:SAH SGC Startup Sequence Step#01 -- Either SB LOP ON

To be checked in

SGC

SAH ON &

Other SB LOP OFF (2 sec pulse)

--

SAH ON &

Other SB LOP ON for 30 sec &SB Oil flow Low

SAH ON &Other SB LOP ON to OFF

--

AUTO OFF: (Rel always available)SAH SGC Shutdown Seq Step#59 -- To be checked in

SGC

SAH SB Oil temp Not HI 40 oC

AUTO ON:SAH SGC Startup Sequence Step#02 -- Either GB LOP


37/87


ON

To be checked in

SGC

SAH ON &

Other GB LOP OFF (2 sec pulse)

--

SAH ON &

Other GB LOP ON for 30 sec &GB Oil flow Low

SAH ON &Other GB LOP ON to OFF

--

AUTO OFF: (Rel always available)SAH SGC Shutdown Seq Step#59 -- To be checked in

SGC

SAH GB Oil temp Not HI


38/87


SGC

PAH AIR MOTOR

SlNo

PARAMETER REQUIREDSTATUS

SETVALUE

REMARKS

ON RELEASE:PAH GB oil temp Not HI


39/87


PAH ON &

Other SB LOP ON for 30 sec &

SB Oil flow Low

PAH ON &

Other SB LOP ON to OFF

--

AUTO OFF: (Rel always available)PAH SGC Shutdown Seq Step#59 -- To be checked in

SGC

PAH SB Oil temp Not HI 40oC

AUTO ON:PAH SGC Startup Sequence Step#02 -- Either GB LOP

ON

To be checked inSGC

PAH ON &

Other GB LOP OFF (2 sec pulse)

--

PAH ON &

Other GB LOP ON for 30 sec &

GB Oil flow LowPAH ON &

Other GB LOP ON to OFF

--

AUTO OFF: (Rel always available)PAH SGC Shutdown Seq Step#59 -- To be checked in


40/87


SGC

PAH GB Oil temp Not HI


41/87


HOME

COAL MILL : Start Permissive1 Mill Start Permit from

PLOS1. Any Lub Oil Pump ON2. Sump/Lube Oil Temp. not High 3.5kg/cm24. Lube Oil Filter DP Not high < 1.5 kg/cm25. Sump Oil Level Adequate (10mm below CL)6. Lube Oil Pressure not very Low >3 kg/cm2

2 Mill Ready Conditions 1. No Pulv. Unsuccessful elevation start2. Bunker Outlet Gate open3. Feeder Inlet Gate open4. Mill Discharge valve open5. Mill start permit from PLOS (See Conditions as above)

6. Mill outlet temp not high 350 mm W3. MILL motor switchgear available4. MILL status off & ignition permit available

MILL PROTECTIONS:

1 Mill Protections Motor winding temp. V high (TD 5 sec)> 130CMotor Brg. Temp. V high (TD 5 sec) >90C


42/87


Mill Brg. Temp very high ( TD 5 sec) >90CMill vibration very high (TD 15 sec) >18mm/sMill trip from PLOSPulv H/W Trip from MCC

Pulv. On & SA HDR/Bowl DP low (TD 1 min) 80

C2. MILL On & Both Lube Oil Pumps off (TD 2 Sec)3. LO Pres V low & LOP in Service ( TD 10 Sec)


43/87


Loss of BFP- at least 2 BFPs offLoss of SAH at least 1 SAH offBCW pumping not O.K,-2P/P on & DP 5 MIN2. Both Lube oil pumps on

3 Standby LOP AutoStart Conditions

1. Lub Oil pump running & pressure low55C &4. Mill status on &5. Auto/manual stop commands not present &6. Feeder seal air valve open &7. Mill current not low or Coal on belt) &8. Mill ready & Fdr. Speed Min & Auto/Man start

Command &Feeder outlet Gate open &

10. Mill Ignition Permit Available or mill ignition supportnot required

2 Protections 1. Feeder Switch not in remote OR2. MFT operated OR

PLANT INTERLOCK AND PROTECTION


44/87


3. Mill outlet temp Low 5sec & no coal on belt & Mill motorcurrent not low OR

8. Pulv. Ignition Permit Not available and ignitionSupport required OR

9. Feeder outlet gate not open

HOME

Mills Related Operating Data

SN Description Operating Data Remarks

Milling System Operating Data1 Hot air Header Press. 803 mm WC Max. Press. -876 mm WC

Press. Lo alarm -625 mm WCVery Low trip -500 mm WC

2 Hot Air Header Temp. 346 Deg. C Max. Temp. - 360 Deg. C

3 Cold air Header Press. 876 mm WC Press. Lo. Alarm-635 mm WC

4 Cold Air Header Temp. 35 Deg. C

5 Mixed Air Press.(Before Mill A-K)

728 mm WC

6 Mixed Air Temp.(Before Mill A-K)

337 Deg. C Max. Temp. 344 mm WC

7 Mixed Air Flow(Before Mill A-K)

Constant air flowof 90.9 T/Hr

Max. Flow -102 T/Hr.Limitation- Motor current, Diff. Press,O/L temp, Mill Reject



45/87


8 Mill A-K O/L Press. 324 mm WC Max. Press. 366 mm WC

9 Mill A-K O/L Temp. 75-800 C Max. Temp- 90 Deg. CWith lo volatile mater 75-800 CWith hi volatile mater 65-750 C

With high Sulpher less than750C10 Mill DP 200 mm WC

11 Mill Bearing Temp. 70 Deg. C

12 Mill Motor Brg. Temp.(NDE)

T Deg. C Trip= T + 5 to10 Deg C* Max. temp. during trial

13 Mill Motor Brg. Temp.(DE)

Trip= T + 5 to10 Deg C

14 Mill Motor WindingTemp.

15 Mill Motor Vib. 4.5 mm/ S Trip=7.1 mm/ S

16 Cooling water I/L press-4.5 KSc/Press drop acrosscooler 0.7 KScQuantity 10m3/hr

17 Coal fineness +50 - 1%-100 - 90.2%-200 - 70.4%

Seal Air System

1 Dynavane Filter OutletPress.

690 mm WC Filter Changeover Press.-250 mm WC(Normal >200 mm WC

2 Seal Air DischargePress. 1198 mm WC

3 Seal Discharge to ColdPA Header

1198-876 = 322mm WC

4 Seal AIR to Mill Diff. 250 mm WC Low Trip- 200 mm WC



46/87


Press.

MILL DAMPERS:

MILL HOT AIR DAMPER

AUTO CLOSE CONDITION1. Auto air flow decrease command from APS OR

2. Hot Air Gate Close Command OR3. MILL Status Off

AUTO OPERATION ENABLED CONDITIONS:

1. HAG Open & MILL On & HAG No command persists & MILL air flow control auto permissive

AUTO REGULATION COMMANDS DISABLED CONDITIONS:1. Same conditions as Auto Close Conditions

MILL COLD AIR DAMPER

AUTO CLOSE CONDITIONS:

1. MILL Status Off &

2. MFT Not Operated & any PA Fan start Pulse conditions are present. In case auto-closing pulse is active thenthe minimum demand is set to 5%* Auto Close shall be disable if

MFT Has operated > 5 min.



47/87


AUTO OPEN CONDITIONS:

MFT Operated for more than 5 minMILL status on & ( Either HAG is closed or HAG Close command is persisting).

* A command of 1 sec is generated in case auto open conditions are present.

OPERATION ENABLED CONDITIONS:

HAG Open & MILL On & HAG No close command persists & Mill Temp control auto permissive is present.

AUTO REGULATION COMMANDS DIABLED CONDITIONS:

1. Auto close command persists OR

Auto Open Command persists

MILL HOT AIR GATE

PROTECTION CLOSE# (Command 2) CONDITION:

a. MILL Status Not On OR any of the conditions at 2-3b. MILL Outlet Temp High > 94C OR

c. Feeder Off OR Pulv. > Unsuccessful Start# Closed Command 2 is issued Instantaneously whereas the protection close command for conditions b-c is

issued with Time delay of 30 Sec. The close command will persist till close feedback is received

CLOSE PERM # ( Command 1) CONDITIONS:

1. Mill HAG Manual Closed Command OR

2. Close command from SGC Logic# Closed command 1 is issued instantaneously whereas the Permissive for close will be issued after a time delayof 30 Sec. The close command will persist till close feedback is received.

OPEN PERMISSIVES CONDITIONS:



48/87


MILL Status on & No HAG Close command 1 & 2.

MILL COLD AIR GATE

CLOSE PERMISSIVES CONDITIONS:

MILL On & Outlet Temp Not Adequate < 55C

AC SCANNER AIR FAN

AUTO START CONDITIONS:

1. No MFT & Scanner dis. Pr - Furnace Pr. DP Low (TD 10 Sec) < 150 mmWC2. Running fan trips (ON Order from VPC/Pushbuttons)

PERMISSIVE FOR OFF:1.Either MFT Operated or Scan Duct to Furnace DP Not Low &

2. Both Scanner fans Running of (MFT & Either Scanner fans On)

HOME

BCW PUMP :START PERMISSIVES:

S

N

PARAMETER REQ. STATUS SET VALUE REMARKS



49/87


1 Pump prot criteria Not present --

2 Pump LP cooling water flow Not low > 75 LPM

3 Pump casing to suct manifold DT Not high < 38oC

4 Pump Motor Cavity temp Not high < 57oC

5 Pump Disch Valve Stem-1 Open --6 Pump Disch Valve Stem-2 Open --

7 Pump Switchgear Available Remote & in service

8 Boiler drum vent valves Closed --

9 Pump Switchgear Not disturbed --

10 CW supply to BCW pumps Normal Any booster p/p ON & Header pressNot low & Emg CW tank lvl OK

TRIP PROTECTIONS:

S N PARAMETER TRIP CONDN ALARM

VAL

TRIP VAL

REMARKS

1 Pump Motor Cavity temp V HI 57oC 60

oC

2 Pump Disch Valve Stem-1 Not Open -- --

3 Pump Disch Valve Stem-2 Not Open -- --

PUMP AUTO START (in standby selection):

S

N

PARAMETER REQ.

STATUS

SET

VALUE

REMARKS

1 Any other running BCWP Tripped --2 BCWP-C ON for 30 sec & DP low (5 sec delay) * (18 psi for >60% MCR, 12 psi for

60% MCR, 12 psi for


50/87


BCW CW BOOSTER P/P

AUTO START CONDITIONS:Running Other Pumps Tripped Or

Other P/P On & Discharge Pressure Low


51/87


Disturbed

9 BFV Operation Selection Remote BFVP Remote & LCP Remote

10 BFV Oil System NO Trouble BFV Oil Disch Pr OK & Oil-tank Level NotLow & BFV Hyd Motor No Over-current

trip

11 Any other Not-running CWP

Disch BFV status

Closed

12 Protection NOT Acted From Sequence Protection Logic

13 Any other pump Startup Sequence NOT ON

14 Pump Discharge Pressure NOT HI < 2.8 ksc

15 EPB NOT Pressed

16 Any Other Pump started & 60 sec over

17 CW path for U# 3 Available OR

CW path for U# 4 Available

Cond # 3: Left I/L & O/L Open (or) Right I/L

& O/L OpenCond#4 (do) & CWV-1 Open & CWV-2

Open.

TRIP PROTECTIONS:

S

N

PARAMTR TRIP CONDN ALARM

VAL

TRIP

VALREM

1 EPB Operated

2 Disch BFV Fast Close command PB/OWS initiated

3 Motor Thrust Brg Temp V HI > 95oC > 100 oC

4 Motor Winding Temp V HI > 130oC > 135oC

5 Upper Guide brg temp(nde) V HI > 95oC > 100oC

6 Lower Guide Brg temp(de) V HI > 95oC > 100oC

7 Vibration V HI > 150 m > 200 m

8 Sump Level V LO < (-) 2.2m < (-)2.4m

9 Motor Elect. Protection Operated -- --

10 Discharge Pressure V HI > 2.8 ksc > 3.0 ksc



52/87


11 Disch BFV Not Open >90% within 90 sec of Pump ON

(CB closing)

12 Pump ON for 150 sec & BFV closes 4.3 Ksc

5 Pump Suct. Hdr Pr. Lo Lo < 0.2 Ksc

PUMP AUTO START:

S N PARAMETER REQ. STATUS REMARKS

1) Pump-3A Selected Standby & 3C Tripped (No delay) OR 3B Tripped

(Delay 2 sec)

2) Pump-3A Selected Standby & Any other pump (3B/3C) ON

& Disch. Hdr. Pr. Low. (< 5.4 ksc) 2/3 logic LVM

3) Pump-3A SGC Startup Sequence Step # 03 ON To be checked in

SGC

HOME

ECW PUMP (BOILER):

START PERMISSIVES:

S N PARAMETER REQ.

STATUS

SET

VALUE

REMARKS

1 ECW PUMP OFF

2 ECWP Suction Valve OPEN

3 ECWP Suct.Hdr.Pr Adequate > 2.5 Ksc 2 / 3 Logic(LVM)

4 ECWP O/H Tank Level NORMAL

5 ECWP SWGR Available Remote & in

service



54/87


6 ECWP SWGR Not Disturbed

7 ECWP Not Tripped

8 ECWP MTR. WDG.Temp. NOT HI < 125 oC

9 ECWP MTR. BRG Temp. NOT HI < 85oC

10 ECWP Selected Stdby & Its Discharge Valve Open ORIts Disch.Valve Close

TRIP PROTECTIONS:

SN

O

PARAMTR TRIPCONDN

ALARM

VAL

TRIP

VALREMARKS

1 ECWP-D ONfor 10sec & Its Disch. Pr. Low &ECWP-E ON & Its Disch. Pr Not Low

2 ECWP ON for 60sec & Its Disch. Valve Not Open

3 ECWP Suction Valve Not Open

4 ECWP Disch. Hdr. Pr. V.HI >8.1 Ksc 2/3 logic(LVM)5 ECWP Suct. Hdr. Pr. V.LOW < 2.5 Ksc 125 oC > 130 oC

7 ECWP MTR.BRG.Temp V.HI > 85 oC > 90 oC

PUMP-D or E AUTO START:

SL

NO.

PARAMETER REQ.

STATUS

REMARKS

1) Pump-D Selected Standby & Other Running pump (E) Tripped

2) Pump-D Selection Standby & Other pump (E) ON For 30.sec & Its Disch.Pr. Low.

(60.sec Delay)

3) Pump-D Selection Standby &Other pump (E) ON For 30.sec & Disch. Hdr.Pr. Low.

4) SGC Start Up Seq Step-03 ON To be checked inSGC



55/87


HOME

ECW PUMP (TURBINE) :

START PERMISSIVES:

S N PARAMETER REQ. STATUS SET VALUE REMARKS

1 ECWP SWGR Available Remote & in service

2 ECWP SWGR Not Distbd

3 ECWP MTR. WDG.Temp. NOT HI < 125oC

4 ECWP MTR. BRG.Temp. NOT HI < 85 oC

5 ECWP Not Tripped

6 ECWP OFF

7 ECWP Suction Valve OPEN

8 ECWP Suct.Hdr.Pr Adequate > 2.5 KSC 2/3 logic

9 ECWPs O/H TNK LVL NOT LOW

TRIP PROTECTIONS:

S N PARAMTR TRIP CONDN ALARM

VAL

TRIP VAL REMARKS

1 ECWP ON for 10sec & Its Disch. Pr. Low

2 ECWP ON for 60sec & Its Disch. Valve Not Open

3 ECWP Suction Valve Not Open

4 ECWP-A ON & ECWP-B OFF & ECWP-C OFF &Disch. Hdr. Pr. Very High

> 8.1 KSC

6 ECWP Suct.Hdr.Pr. Low Low < 2.5 Ksc < 0.2 KSC 2/3 logic

7 ECWP MTR. WDG Temp V.HI. > 125oC > 130

oC

8 ECWP MTR. BRG Temp. V.HI > 85 oC > 90 oC



56/87

Stage II ( 2 x 500 MW )

PUMP A or B or C =AUTO START:

S N PARAMETER REQ.

STATUS

REMARKS

1 Pump-A Selection Standby & Any other pump (B/C) Tripped

2 Pump-A Selection Standby & Any other pump ON (B/C) & Disch. Hdr. Pr.Low.

3 SGC Start Up Sequence Step-03 ON To be checked inSGC

ECW O/H TANK LEVEL :

S

N

PARAMETER REQ. STATUS REMARKS

ECW O/H TANK EMG MU VALVE AUTO OPEN

1 ECWs O/H Tank Level V.LOW

ECW O/H TANK EMG MU VALVE AUTO CLOSE

2 ECWs O/H Tank Level HIGH

ECW O/H TANK NORMAL MU VALVE AUTO OPEN

3 ECWs O/H Tank Level LOW

ECW O/H TANK NORMAL MU VALVE AUTO CLOSE

4 ECWs O/H Tank Level HIGH



57/87


HOME

CEP :

START PERMISSIVES:

S No PARAMETER REQ. STATUS SET VALUE REMARKS

1 CEP Suct.Valve OPEN

2 Hotwell Level Not Low >-250. mm 2/3 Logic

3 CEP Swgr. Available (Remote & in Service)

4 CEP Swgr Not Disturbed

5 CEP Thrust Brg.Temp Not HI. 125oC >130oC *Two Tx for each Phase.

7 CEP Suct.Valve Not Open



58/87


PUMP AUTO START:

(*Release: Drive Start Permissive Available)

SNO. PARAMETER REQ. STATUS REMARKS

1) Pump Selection Standby & Other Running pump Tripped

2) Pump Selection Standby & Other Pump ON For 30.sec &

Disch. Pr. Inadequate (Delay)

3) Pump Selection Standby & Any other Pump ON For 30.sec

&Disch. Hdr. Pr. Low.

S

NO

PARAMETER REQ. STATUS REMARKS

DISCHARGE VALVE AUTO OPEN: (*Release: Discharge Valve I.B.V Open)

Pump ON & Disch.Pr.Not Low (2.sec Delay)

CEP Disch.Pr.Not low &CEP-B or CEP-C ON & CEP-A SGC StartPermissive Available & CEP-A Standby Selected (5.sec Delay)

DISCHARGE VALVE AUTO CLOSE: (*Release: CEP OFF)

CEP Standby Selected & Disch.Hdr.Pr. Low (120.sec Delay)CEP OFF *1.5sec Pulse

DISCHARGE VALVE I.B.V. AUTO OPEN:

1) CEP ON & Disch.Pr.Not Low (2.sec delay)

2) CEP Disch.Pr.Not low & CEP-B or CEP-C ON & CEP-A SGC Start

Permissive Available & CEP-A Standby Selected (5.sec Delay)

*1.5 sec Pulse

DISCHARGE VALVE I.B.V. AUTO CLOSE:

1) Disch.Valve OPENED

VENT VALVE AUTO OPEN: (*Release: CEP OFF)



59/87


1) CEP Disch.Pr.Not low & CEP-B or CEP-C ON & CEP-A SGC Start

Permissive Available & CEP-A Standby Selected (5.sec Delay) &

CEP OFF.

VENT VALVE AUTO CLOSE:

1) CEP ON (120.sec Delay)

HOME

MD BFP :

START PERMISSIVES:

S N PARAMETER REQ.STATUS

SET VALUE REMARKS

1 MDBFP AOP ON & Lub Oil Pr. OK >2.0 ksc (2 sec Delay)

2 MDBFP Suct. Valve OPEN

3 D/A Level Not Low > +20 mm 2/3 logic

4 Working oil Temp. upstream

CLRS

Not HI < 110 oC 2/3 logic

5 LUB Oil down stream CLRS

Temp.

Not HI < 55oC 2/3 logic

6 BFP Casing TOP/BOT

Diff.Temp.

Not HI < 22 oC

7 BFP JOURN. BRG. Temp. Not HI < 90oC

8 BFP THRUST BRG. Temp. Not HI < 100oC

9 HYD.COUPL.BRG.Temp Not HI < 90 oC

10 BFP MTR. JOURN. BRG. Temp Not HI < 85 oC



60/87


11 BFP MTR.WDG.Temp Not HI < 125oC Two Tx for each phase

12 SWGR. Available

13 SWGR. Not Disturbed

14 BFP Recir.Valve OPEN

15 BFP CW Valve CLOSE16 BFP Disch. Valve & its IBV CLOSED OR BFP Standby

Selected

17 BFP Rapid Start Up Solenoid SOV92 & SOV93

ON &Scoop Position Min. (0%) OR HYD.COUP.

MIN/CLS

18 Booster Pump JOUR. BRG.

Temp.

Not HI. < 90 oC

19 Booster Pump Thrust BRG.Temp

Not HI. < 100oC

20 BFP FW Disch/ Suct.

Diff.Temp.

Not HI. < 10oC Difference of MVN

21 BFP CW Hdr.Pr. Adequate >3.0 ksc

22 BFP HC Tank Level Not Low

23 BFP HC Tank Level Not HI

24 MD BFP not in standby OR Reverse Rotation Not

acted

25 Working Oil down stream CLRS

Temp

Not HI < 75 oC

MDBFP TRIP PROTECTIONS:

S N PARAMTR TRIP CONDN ALARM

VAL

TRIP VAL REM



61/87


1 MD BFP ON & MDBFP Corrected speed is.

more than the Suct. Flow for 15 sec

> 50 T/Hr

2 MD BFP Suct. Flow Low < 200 T/Hr.

3 Lub Oil Pr.in Hdr. V.LOW < 0.8 ksc 2/3 Logic

4 Working Oil Temp. V.HI > 130o

C 2/3 Logic5 MD BFP Suct. Flow Low < 200 T/Hr.

6 Lub Oil Pr.in Hdr. V.LOW < 0.8 ksc 2/3 Logic

7 MD BFP Suct. & Disch. Diff. Temp. > 15 o C 2/3 Logic

8 Lub Oil Temp. D/S L.O CLR V.HI > 60 o C

9 MD BFP Jour. BRG.Temp V.HI > 95 o C

10 MD BFP Thrust BRG. Temp. V.HI > 105 o C

11 MD BFP MTR. WDG Temp. V.HI > 130 o C Two Tx for each phase

12 D/A Level V.LOW < -

1610mm

2/3 Logic

13 MD BFP MTR.Jour.BRG.Temp. V.HI > 90

o

C

14 Hyd.Coup.BRG.Temp. V.HI > 95 o C .

15 Booster Pump Thrust brg

temp

V.HI > 105 o C

16 Booster Pump Jour.

BRG.Temp

V.HI > 95oC



62/87


HOME

TD BFP :

START PERMISSIVES:

S N PARAMETER REQ. STATUS SET VALUE REMARKS

1 P/P Suction valve open Open

2 Deaerator level not low Not low > +20 mm GC

3 P/P recirculation valve open Open

4 Discharge valve closed Closed

5 Discharge Hdr pr. Not low Not low > 1.5 ksc

6 Pump casing top/bottom DT Not high < 20 C

7 Condenser pressure < 0.5 Ksc8 Lub oil header pressure Not low

9 Lub oil Temp. after cooler Not High

10 Governing oil pressure Not low

11 Dear box brg. Temp Not High

12 Brg. temp Not High

13 BP Brg. Temp. Not High

14 BP Thrust brg. Temp. Not High

15 Journal Brg. Temp. Not High

16 Thrust Brg. Temp. Not High

17 LOP A or B on

18 BFP not working

19 Speed > 30 rpm

20 Aux. Steam Block valve opened

21 Aux. Steam Pressure > 12 Ksc.

PLANT INTERLOCK AND PROTECTIONS II ( 2 500 MW )


63/87


22 Aux. Steam Temp. > 250oC

23 Aux. Steam SH > 50oC

PLANT INTERLOCK AND PROTECTIONSt II ( 2 500 MW )

N VAL

G VALUE

1 TDBFP working AND suction flow& R i l ti l l d d

Low < 200 TPH


64/87

Stage II ( 2 x 500 MW )& Re circulation valve closed andTDBFP Speed >1000rpm

2 De aerator level lo lo Lo Lo < - 1610 mmWC < 50.0 > 0.0mmWC

3 Lube oil Hdr.. Pr. lo-lo Lo Lo < 1.5 Ksc < 1.0 Ksc < 0.6 ksc- EOP starts 2.5 Ksc

4 P/P Suction valve not open Not open

5 TDBFP Exhaust stm temp very high HI HI > 85 C > 120 C > 85 C hood spray on - 0.87 Ksc/ 44C

6 Live steam pressure very high HI HI > 10.9 Ksc > 12.5 Ksc < 4.5 Ksc low alarm 10.3 Ksc/ 320C

7 Exhaust steam pr.very high HI HI > - 0.6 Ksc > - 0.4 Ksc - 0.87 Ksc

8 Gland Steam pressure >700 mmWC- high alarm 150 mmWC high alarm 13 Ksc/ 330C

10 Turbine Drai < 130 C low alarm Atm / 100 C

11 Gov. ( Control ) oil Pr. Very low Lo Lo < 4.5 Ksc < 6.5 Ksc low alarm 7.5 Ksc/ 45 C

12 Trip oil pr. very low Lo Lo < 2.0 Ksc > 4.5 Ksc ESV interlock. 5.0 Ksc/ 45 C

13 Start up oil pr. > 5.5 Ksc Interlock 6.0 Ksc/ 45 C

14 Secondary oil pr. < 1.4 Ksc ESV interlock 4.5 Ksc/ 45 C15 LP Secondary oil pr. > 1.4 Ksc To ETH 5.0 Ksc/ 45 C

16 Turbine Axial shift high0.7 mm

HI HI +/- 0.5 mm +/- 0.7 m

17 Turbine eccentricity high>80 mic

HI >137micron

92 micron

18 Turbine Differential Expansion HI HI > 1.95 mm > 2.60 mm

19 Casing Expansion HI > 5.0 mm

20 Turbine FJB & RJB Vibration High HI HI > 77micron

> 70 micron 77 micron

21 Trip PB operated

22 Remote trip command23 Turbine speed V high ( Overspeed) HI HI 6300 rpm

24 Gear Box O/P & I/P vibration high HI HI >70 micron

25 Turbine bearing Temp V high HI HI > 105 C > 120 C 60 to 80 C

26 Gear Box brg Temp V high HI HI > 90 C > 95 C 60 to 80 C

27 Main pp & Booster P/P brg Temp Vhigh

HI HI > 90 C > 95 C 60 to 80 C

28 Main pp & Booster pp thrust brgTemp V high

HI HI > 95 C > 105C 60 to 80 C

PLANT INTERLOCK AND PROTECTIONSt II ( 2 500 MW )


65/87


TDBFP TRIP PROTECTIONS:

HOME

TDBFP OIL SYSTEM INTERLOCKS & PROTECTIONS:

S N PARAMTR TRIPCONDN

ALARM

VAL

TRIP

VALREMARKS OPERATING

VALUE

1 Lub oil pump discharge pressure Low < 7.0 Ksc S/B pump start, 2 secdelay

11.6 Ksc./45oC

2 Lub oil pump discharge headerpr.

High > 12.0Ksc

11.6 Ksc./45oC

3 Lube oil Hdr.. Pr. lo-lo Lo Lo < 1.5 Ksc < 1.0 Ksc < 0.6 ksc- EOP starts 2.5 Ksc./ 45oC

4 Turbine brg. Oil Drain pr. High > 100 Ksc Atm. pr./ 70oC

5Lub oil tank level low

Low< 1150

mm1250 mm high alarm

Atm. pr./ 60oC

6 Lub oil DP across Filter high High > 1.0 Ksc 0.5 Ksc./ 45oC

7 Lub oil DP across EOP Filter high High > 1.5 Ksc 0.5 Ksc./ 45oC

8 Gov. oil DP across gov. oil Filterhigh

High > 1.0 Ksc 0.5 Ksc./ 45oC

9 Lub oil Temp. after Cooler hig High > 45oC 10.0 Ksc./ 45

oC

10 Lub oil Tank Temp. High High > 65oC Atm. pr./ 60

oC

11 Jacking oil Header pressure low Low < 100Ksc

100 Ksc./ 45oC

12 Remote Engagement > 5.0 Ksc 4.5 Ksc./ 45oC

LUB OIL PUMP:SL NO. PARAMETER

LUB OIL PUMP AUTO START:

1 LO p/p OFF & ON COMMAND FROM START-UP SEQUENCE-02



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2 Other LOP/p TRIPPED (2.Sec Pulse)

3 ON COMMMAND (10 Sec. Delay) GIVEN BUT PUMP NOT ON (2 Sec Pulse)

4 {TDBFP WORKING ORLO P/p ON (90 Sec Delay)}

&

{LOP- DISCH PR.LOW (< 7.KSC) ORLOP HDR PR


67/87


3 TDBFP SPEED 540 RPMJOP AUTO STOP :

1 START UP SEQUENCE -07

2 SHUT DOWN SEQUENCE -56

3 TDBFP SPEED >540 RPM

TURNING GEAR VALVE:

SL NO. PARAMETER

TURNING GEAR VALVE AUTO OPEN :

1 {TG VALVE CLOSE ORTDBFP SPEED 540 RPM4 TDBFP SPEED >200 RPM & TG VALVE OPEN FEEDBACK AVAILABLE



68/87


TURBINE PROTECTION :

S

N

Description of Permissive/ Protection ALARM VAL TRIP VAL REMARKS OPERATINGVALUE

1 OVERSPEED TRIP-1 > 8 to 9 % OF RATED SPEED HYDRAULIC

2 OVERSPEED TRIP-2 > 8 to 9 % OF RATED SPEED

3 AXIAL SHIFT +/- 0. 5 mm +/- 1.0 mm 2/3 LOGIC

4 LOW VACUUM TRIP DEV -- HYDRAULIC

5 MANUAL TRIP DEVICE -- HYDRAULIC

6 EMERG TRIP SWITCH 1 DESK --7 EMERG TRIP SWITCH 2 DESK --8 HP EXHAUST TEMP. HIGH > 485C > 500C 2 OUT OF 3

9 LP OUTER CASING TEMP. HIGH > 90C > 110C10 COND. PRESS. TRIP (VSP) > 0 2 OUT OF 3

11 COND. PRESS. TRIP (FSP) AND Turbine speed> 540 rpm.

- 0.7 bar 2 OUT OF 3

12 FIRE PROT SWITCH

13 OIL TANK LEVEL VERY LOW 2 OUT OF 3

14 LUB OIL PRSS. VERY LOW < 4.5 ksc (s/bpp auto start)

< 1.2 Ksc 2 OUT OF 3

15 EMERG TRIP SWITCH 1 BKUP PANEL CONNCETED IN

16 EMERG TRIP SWITCH 2 BKUP PANEL ANDED LOGIC

17 TRIP COMMD FROM ATRS

18 GEN. ELCTRICAL PROTECTION 2 OUT OF 3

19 GEN PROT ( MECH) CLASS B 2 OUT OF 320 MASTER FUEL TRIP RELAY 2 OUT OF 3

21 HP CASING TOP-BOT DT HIGH > +90 & < -90o C > +100 & < -100 o C 2 OUT OF 3 510

o C22 IP FRONT TOP-BOT DT (ABS) > +30 & < -30

o C > +45 & < -45 o C 2 OUT OF 3

23 IP REAR TOP-BOT DT ( ABS) > +30 & < -30o C > +45 & < -45 o C 2 OUT OF 3



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24 LIQUID IN GEN MAIN LEADS TOP-TRIP LVL> max.25 COLD GAS TEM AFT CLR A/B 60 o C 2 OUT OF 3

26 COLD GAS TEM AFT CLR C/D 60 o C 2 OUT OF 3

27 SEAL OIL TEM HIGH AFT CLR AIR SIDE > 55 o C 2 OUT OF 3

28 HOT AIR MAIN EXCITER TEMP HIGH > 80o

C 2 OUT OF 329 PRIMARY WATER TEMP AFT CLR HIGH > 71 o C 2 OUT OF 3

30 STATOR WIND FLOW LO LO 48 M3/hr 2 OUT OF 3

31 STATOR MAIN BUSHING R FLOW LO LO 1.33 M /hr 2 OUT OF 3

32 STATOR MAIN BUSHING S FLOW LO LO 1.33 M /hr 2 OUT OF 3

33 STATOR MAIN BUSHING T FLOW LO LO 1.33 M3/hr 2 OUT OF 3



70/87


TURBINE LUB OIL SYSTEM:INTERLOCKS & PROTECTIONS:

1. Oil Ta k level High > 700 mm

2. AOP 1 / 2 Tripped1. AOP 1 Tripped OR

2. AOP 2 Tripped1. Oil Tank level High > 700 mm2. AOP 1 / 2 Tripped

3. AOP 1 Tripped OR4. AOP 2 Tripped

3. Jacking Oil Pressure Low1. Turbine Speed < 510 rpm &2. Turbine Speed > 15 rpm &3. Jacking Oil Pressure < 100 Kg/cm2

4. Reserve Oil Pump ONEmergency Oil Pump On ORJOP 2 On OR JOP 3 On5. Switch off oil pumps AOP 1 OR AOP 2 ON &

Turbine speed > 2850 rpm & Pr. Oil Pressure > 7 Kg/cm26. Lube Oil Pressure low

I)Turbine Speed > 15 rpm &II) Lube oil pressure < 4.5 Kg/cm2

7. Lube Oil Pressure L LowIII)Turbine Speed > 15 rpm &IV) Lube oil pressure < 1.1 Kg/cm2

8. Gate valve gearing not closed.1. Turning gear limit switch not close status.

9. DP across Lube oil filter High > 0.9 Kg/cm2

10. Leak oil tank level Hi2. Level > 50 %

3. Power supply of Lvl switch not failed.1. J O Filter chocked > 4.2 kg/cm22. Oil temp after cooler High > 50 C3. SLC Turning system not ON OR

SLC JOPs not OnJOP Discharge header pressure

TG AOP Auto Start

SGC oil supply step 2 command i.e, SGC oil supply ON

ORSLC AOP 1 On AND ( AOP 2 tripped OR

Oil Pressure < 4.8 Kg/cm2)TG AOP Auto Stop:Through SGC Oil SupplyTurbine Speed > 2850 rpm &Oil Pressure > 7 Kg/cm2 ORThrough SGC Oil Shutdown

Lube Oil temp control manual mode &

SLC Jack oil pumps OFF &SLC Jack oil pump -3 OFF &Jack oil pump 1 Off &Jack oil pump 2 Off &Jack oil pump 3 Off

Protection Stop Oil tank level V Low OR

Fire protection 2 Pushed

DC EOP Protection on:SLC EOP On &Lube oil Pressure < 1.1 Kg/cm2 ORTemperature HP Casing Top > 120 C OR

Temperature HP Casing Top > 120 CL.O.Pr < 1.1 Kg/m2 ( Direct from Pr. Switch)

JOP 1 Auto StartSLC JOPs ON &

JOP-2 OFF &Turbine Speed < 510 rpm

JOP 1 Auto Stop:SLC JOPs ON &Turbine Speed < 510 rpmJOP 2 ON Command through SLC. ] OR

[i.Turbine Speed < 510 rpm &ii. Jacking oil pressure < 100 Kg/cm2 &



71/87


iii. SLC JOP 3 ON (7 Sec Delay)]

Protection Stop Oil tank level V Low OR Fire protection 2 Pushed

DC JOP 3

Permissi ve: Both JOP 1 AND JOP 2 in OFF ConditionDC JOP Auto Start1. Turbine Speed < 510 rpm &

Jacking oil pressure < 100 Kg/cm2 &SLC JOP 3 ON (7 Sec Delay) OR

2. Turbine Speed < 2800 rpm &JOP 1 Voltage failed &JOP 2 Voltage failed &SLC JOP 3 ON OR

JOP 2 Tripped AND SLC JOP 3 ON ORProtection Stop Oil tank level V Low OR Fire protection 2 Pushed

Turning Gear Permissive :1. Turbine speed > 15 rpm

OR2. [ i. DP S/O Air H2 side TE > 1.2 Kg/cm2 &

ii. DP S/O Air H2 side EE > 1.2 Kg/cm2 &iii. Seal Oil Pr. H2 side > 7.0 Kg/cm2

Auto OpenSLC Turning gear ON AND Turbine Speed < 210 rpm

Auto Close1. [i. SLC Turning gear ON &

ii. Turbine Speed > 240 rpm ] OR2. Through SGC Oil Supply step 51 i.e SGC Oil Shut down On & HP Outer Casing Top AND bottom Temp < 100 C

Protection Close : Lube Oil Pressure < 1.2 kg/cm2Oil Vapour Extractor -1 Auto Starti. Other Vapour Extractor ON &

ii. Oil Vapour Extr heater Pr. > Max ( 2 min delay ) OR Other Vapour extractortripped OROther SGC Supply STEP 2 ( As soon as SGC oil Supply made ON) ForExtractor 1 only.).



72/87


Leakage Oil Pump:Auto Start: Leakage oil tank level > 50%Auto Stop: Leakage oil tank level < Minimum



73/87

g ( )

CONTOL FLUID SYSTEM: INTERLOCKS & PROTECTIONS:

1. Leakage Level High

Speed change over device leakage detected

OR

Hydraulic pr. water injection valves leakage detectedOR

Over speed governor leakage detected2. Hydraulic control fluid pressure low.

HPCF Pressure after P/P 1 < 26 Kg/cm2AND

HPCF Pressure after P/P 2 < 26 Kg/cm2

ANDTurbine speed > 15 rpm3. HPCF Filter DP highFilter Supply Units DP OR

CF filter DP OR

LP Bypass filter DP >0.6Kg/cm2

4. Water CF Tank High

CF Conductivity High

5. HPCF Temperature Low/Fault < 50 C

6. HPCF Temperature High/Fault > 62.C

7. HPCF Pumps Fault

SLC HPCFs on with 10 sec delay &Any HPCF auto on command

8. HPCF Tank Temp. Low < 20 C

9. HPCF Tank level High > 59 %

10. HPCF Tank level Low < 53 %

HP Control Fluid pump - 1 Auto StartSLC HPCF Pumps On &HPCF pump 2 Disch. Pr. 40 % &

Gland steam control valve closed

Protection Off:Fire Protection-1 OR Fire Protection-2 Pressed.

HPCF VAP EXTR-1 Auto StartHP Control Fluid Press > 30 Kg/cm2 ORHPCF Vapour Extractor 2 tripped

HPCF Circulation Pump-1 Start Permissive: HPCF Circulation P/P-2 OFFAuto StartSGC HPCF on &

HPCF Pr. > 30 Kg/cm2 &

HPCF Vap Extr on

Auto Stop

Through SGC HPCF OFF Command 71

Protection Off

HP Protection suction vessel level < Min OR

HP Protection 1 Or Fire Protection 2 Pressed.



74/87

g ( )

11. HPCF Tank level V Low < 50 %



75/87

g ( )

SEAL OIL SYSTEM: INTERLOCKS & PROTECTIONS:Oil level in Pre chamber (TE/EE) HighSO level pre chamber (TE) > maxSO level pre chamber (EE) > maxLiquid at main leads top High

Liquid at main leads top, high sensed by any two of the three levelswitches.

Level in SOST lowSO storage tank level low sensed by any one of the two level

switches.1. Pressure after AC SOP 1/2 (AS) low i.e., < 7.5 Kg/cm22. Pressure after DC SOP 3 (AS) low i.e., < 7.5 Kg/cm23.. Pressure after AC SOP 4 (H2S) low (i.e., < 7.5 Kg/cm24. DP across SO filter AS/H2S High ( > 0.9 Kg/cm2)5. SO Pr. (TE/EE) Air side Low ( < 4.9 Kg/cm2)6. SO temp after cooler (AS) High (> 50 C)7. SO temp after cooler (H2S) High (> 50 C)8. SO temp after cooler V High (> 55 C)

9. SO/H2 Diff Pr (TE AND EE ) High (>1.7Kg/cm2)10.SO/H2 Diff Pr (TE AND EE ) low (> 0.9Kg/cm2)12.H2 Pressure in Manifold low ( < 15 Kg/cm2)13.H2 Pressure in Gen Casing low ( < 3.3Kg/cm2)14.H2 Pressure in Gen Casing High ( > 3.8Kg/cm2)15.H2 Pressure in Gen Casing low ( < 95 %)

16.PW Pr. after Pump low ( 5 Kg/cm2)

17.DP Pr. Winding High ( > 1.5 Kg/cm2)

18.PW temp after cooler V High ( > Kg/cm2)

19. Stator Wdg Flow low ( < 54 m3/hr)

20. Stator Wdg Flow V low ( < 48 m3/hr)21. Flow through R bush V low ( < 1.33 m3/hr)

22. Flow through S bush V low ( < 1.33 m3/hr)

23. Flow through T bush V low ( < 1.33 m3/hr)

Seal Oil P/p (air side) Auto Start:SLC SO Pump 1 / 2 (AS) on &SO storage tank level not low &Other SO pump (AS) off. &SO pr after SOP/p (AS) < 7.5Kg/cm2.(2 Sec delay ORSO SGC Step-1 command ( SO SGC start up ON).

DC SOP Auto Start:DC SOP local PB On command ORSLC DC SOP 3 On &SO/H2 DP ( TE/EE) < 0.9 Kg/cm2 ( 2 sec delay)

Seal Oil P/p ( H2 side) Auto Start::Through SGC SO Step 3 Command i.e.,

SLC SO pumps 1/2 (AS) on &SLC BC EXH fan 1/2 on &SLC DC SOP onProtection Stop:SO tank low ORSOP Pressure air side < 4.5 kgcm2 (3 sec delay)

Other BC Exhaust Fan Auto startSLC BC EXH fan On &Other BC Exhaust Fan on &

Pr at respective BC Exh fan > -5 mbar ( 2 s delay) ORSLC BC EXH fan On &Other BC Exhaust Fan off ORSO SGC step-1 command (i.e., SO SGC start up ON)

Primary water Pump Auto Start:SLC PW Pumps on &PW Tank level > 41.49 % &Other PW Pump 2 Off ] ORSLC PW Pumps on &PW Tank level > 41.49 % &Stand by PW Pump on &

Pressure after Stand by PW Pump < 5Kg/cm2 ]

Gas drier heater Start permissive:Gas drier blower ON for 10 minSLC gas drier ON AND Air temp at drier out let < 60 C( 10 Sec delay)



76/87

24. PW Pr. at stator Wdg I/L High ( > 3.8 Kg/cm2)

25. Hot Gas temp. Coolers A AND B High ( > 80 C)

26. Hot Gas temp. Coolers C AND D High ( > 80 C)

27. Cold Gas temp. Coolers A AND B High ( > 55 C)

28. Cold Gas temp. Coolers C AND D High ( > 55 C)

29 Cold Gas temp. Coolers V High ( > 60C)

30. Temperature Hot Air Main Exciter High ( > 75 C)

31. Temperature Hot Air Main Exciter V High ( > 75 C)

32. PW Pr. Stator I/L Low ( > 3Kg/cm2)

33. SO Pr. AS (TR/EE) Liw ( 70 C)

35.Conductivity after Winding High > 3 micro S/cm

36. Conductivity after main filter High ( > 3 micro S/cm37. Conductivity after Ion exchanger Low < 1 micro S/cm

Auto off: Air temp. at Gas exhaust > 80 deg c

Protection off: Gas drier blower off ORGas drier heater temp > 150 C.Gas drier blower Start permissive:

Gas drier blower LS-1 open ORGas drier blower LS-2 open

Auto on : SLC gas drier ONOff Permissive: Gas drier heater offAuto off: SLC gas drier ON AND Air temp. at drier Out let 240 rpm &Exciter Shut down Heater Off &SLC Air Drier On.

TURBINE TURBOVISORY

Alarm Trip

Axial Shift 0.5 mm 1 mm

Differential Expansions

(i) HPT(ii) IPT -5.0 to +3.5 mm-1.0 to +5.5 mm

Overall Expansion of IP + LP Rotor -3 to + 30 mm



77/87

Vibration

Absolute Brg. Housing Vibn Absolute Shaft Vibn.

Standard Alarm setting 25m above normal level

Maximum Alarm setting 42m (85-MMI) 100m (200 MMI)

Limit Value for Tripping 53m (106-MMI) 160m (320-MMI)

Alar Trip

Bearing Temperatures 90 to 115oC (depending on

operating temp. of bearing)

130oC

Fixed Points

For HP casing Turbine bearing pedestal - 2

For IP casing Turbine bearing pedestal - 2

For LP casing Turbine bearing pedestal - 3

For Turbine Rotor Thrust bearing.

All HP, IP & LP Turbine Bearing Pedestals are Fixed.

CASING TEMPERATURE LIMITING VALUES

Alar M/C must be shutdown at

HP turbine casing exhaust 485oC 500

oC

Outer casing of LP cylinder(Spray water to L.P. turbine must be switched on at

90oC 110

oC



78/87

90oC).

Temperature difference

Between upper & lower casing of HPT. (Middle) 90oC 100oC

IPT Top / Bottom Diff. temp. (Front) 30oC 45oC

IPT Top / Bottom Diff. temp. (Rear) 30o

C 45o

CPermissible temperature difference between parallelsteam supply lines

No time limitation 17oC

Short time period (15 min) 28 oC

DIFFERENT LEVELS

DRUM LEVEL

( FROM HYFRASTEP )S No PARAMETER VALUE REMARKS

1 NORMAL LEVEL 0 50 mm

2 HIGH LEVEL ALARM + 125 mm 6th

PORT FROM TOP

3 HI HI LEVEL TRIP +250 mm 2n

PORT FROM TOP

4 LOW LEVEL ALARM - 175 mm 6t

PORT FROM BOTTOM

5 LO LO LEVEL TRIP - 375 mm 2nd

PORT FROM BOTTOM

DEAERATOR LEVEL

S No PARAMETER VALUE REMARKS


2 HIGH LEVEL ALARM + 300 mm

3 HI HI LEVEL TRIP +500 mm

4 LOW LEVEL ALARM - 680 mm

5 LO LO LEVEL TRIP - 1350 mm

6 VERY LOW LEVEL BFP TRIP FROM LEVEL SWITCH 2/3



79/87

HOTWELL LEVEL

S No PARAMETER VALUE REMARKS


2 HIGH LEVEL ALARM + 100 mm3 HI HI LEVEL TRIP +150 mm

4 LOW LEVEL ALARM - 250 mm

5 LO LO LEVEL TRIP - 1955 mm

MOT LEVEL

S No PARAMETER VALUE

( From TOP )

REMARKS

1 NORMAL LEVEL 750 mm Range 0 to 1600 mm

2 HIGH LEVEL ALARM 900 mm

3 LOW LEVEL ALARM 1050 mm

4 LO LO LEVEL ALARM 1350 mm

HCF LEVELS No PARAMETER VALUE

( From TOP )

REMARKS

1 NORMAL LEVEL 700 mm Range 0 to 1600 mm

2 HIGH LEVEL ALARM 650 mm


4 LO LO LEVEL ALARM 800 mm

BFPs OIL LEVEL


( From BOTTOM )

REMARKS

1 NORMAL LEVEL ----- Range 0 to 1400 mm




80/87

HEATERS LEVEL

S No HEATERS RANGE NORMAL LOW HIGH HIGH HIGH

1 LPH 1 -275 to +275 - 25 - 225 0 + 50

2 LPH 2 -800 to 0 - 525 - 610 - 440 - 1403 LPH 3 -750 to + 50 - 460 - 545 - 375 - 140

4 HPH 5A/5B &

6A/6B -275 to +525 0 - 195 + 135 + 415ALL VALUE IN MM

CBD TANK LEVEL


( From BOTTOM )

REMARKS

1 NORMAL LEVEL + 300 to + 350 MM Control V/V sets2 LOW LEVEL ALARM + 130 mm

3 HIGH LEVEL ALARM + 530 mm

OTHERS TG ALARMS

DESCRIPTION ALARM VALUE

1 HPT EXHAUST STEAM PRESSURE VERY HIGH > 50 Ksc

2 LEAK STEAM HPT U-RING > 350 deg C

3LUB OIL FILTER CHOCKED > 0.9 Ksc

4 OIL TEMP. AFTER OIL COOLERS HIGH > 50 deg C

5 CONTROL OIL PR. LOW < 4.5 Ksc

6 JACKING OIL PR. LOW < 150 Ksc

7 JACKING OIL FILTER CHOCKED > 4.2 Ksc



81/87

8 HP CONTROL FLUID TANK TEMP LOW < 20 deg C

9 CONTIN FLOW HEATER TEMP. HIGH > 75 deg C

10 HP CONTROL FLUID PIPE TEMP. FAULT > 60 deg C & < 50 deg C

11 HPCF PRESSURE LOW < 26.0 Ksc

12 HPCF FILTER DP HIGH > 0.6 Ksc13 WASTE FLUID TANK LEVEL HIGH > 50%

14 VACUUM PUMP S/B START > 0.15 KSc

15 VACUUM PUMP S/B OFF < 0.15 Ksc

16 TURBINE TRIPPED ( LOW TRIP OIL PRESSURE) < 2.0 Ksc

17 GLAND STEAM PRESSURE ABNORMAL > 450 MMWC & < 200 MMWC

18 SEAL STEAM VALVE INTERLOCK OPERATED(CLOSE) < 210 deg C

19 OIL FLTR. FOR GL. SEAL STEAM VALVE CHOCKED > 5.0 Ksc

20 SEPARATOR WATER (VAC. PP) TANK MAKEUP V/V Open < 330 mm; Close > 360 mm with5 sec Time Delay.

21 SEAL WATER (VAC.PP) PUMP FLOW LOW < 20 M3/hr

22 VACUUM PUMP SEAL WATER TEMP. HIGH > 40 deg C

23

24

25

26

27



82/87

HOME

COMPRESSOR :

START PERMISSIVES:


1 Cooling Water flow OK

2 Supply Voltage. 24 V (+/-) 10% AC OK

3 Any Trip. ( Safety interlocks) Not present

TRIP PROTECTIONS:

S

NO

PARAMETER TRIP CONDN ALARM

VAL

TRIP VAL REMARKS

1 Emergency Push Button Trip Operated

2 Lub Oil pressure low Low 1.33 Ksc 1.20 Ksc 20 sec delay

3 Lub Oil Temp. High. High 70 oC 80 oC 50 sec delay

4 LP Outlet Air Temp. High High 225 oC 235 oC 1 sec delay

5 HP Inlet Air Temp. High High 65 oC 70 oC 1 sec delay

6 HP Outlet Air Temp. High High 225oC 235

oC 1 sec delay

7 Motor Winding Temp. High.

(R, Y, B ) phase

High 140 oC 150 oC Tripping from mainPLC

8 Motor DE Brg. Temp. High High 85oC 90

oC Tripping from main

PLC9 Motor NDE Brg. Temp.

High

High 85 oC 90 oC Tripping from main

PLC

10 Cooling Water Flow low Low Tripping from mainPLC



83/87

HOME

FIRE FIGHTING SYSTEM :

FIRE HYDRANT PUMPs:

S

NO

PARAMETER SET VAL REMARKS FAIL TO START

After pp

NRV Ksc

Before pp

NRV Ksc

Hydrant p/p normal dis. Pr.= 11 to 12 Ksc.

1 Main Hydrant P/p 1 (H-M-01) auto start


84/87

1 Electric Spray water P/p (WS-M-01)auto start


85/87

3 Running Jockey pumps auto stop above3665 mm

Lvl. Switch: LS-8003

from Hydro-pneumatic

Tank.

4 Air Compressor 1 ( AC-01 ) auto start 10.3 Kscfalling

Pr. Switch: AC-1001A

5 Air Compressor 1 ( AC-01 ) auto stopt 10.7 Kscrising

Pr. Switch: AC-1001A

6 Air Compressor 2 ( AC-02 ) auto start 9.8 Kscfalling

Pr. Switch: AC-1001B

7 Air Compressor 2 ( AC-02 ) auto stopt 10.7 Kscrising

Pr. Switch: AC-1001B

8 HP TankAir pressure High 10.9 Ksc Pr. Switch: PS-6031

9 HP TankAir pressure Low 4.5 Ksc Pr. Switch: PS-6032

10 HP Tank Solenoid valve open 11.0 Ksc Pr. Switch: PS-6029

11 HP Tank Solenoid valve close 10.7 Ksc Pr. Switch: PS-6030

HOME

PT CW SYSTEM :

START PERMISSIVES:


RAW WATER PUMP

1 RW Pump MCC Not distrubed

2 RW sump level Not low 2.35 mtr. rising3 Lubrication water pressure Not low 2.0 Ksc. falling

4 RW Pump discharge MOV closed

5 Cascade aerator inlet CV>25%open or Bypass v/v open.



86/87

CLAEIFIED WATER PUMP

1 CLW Pump MCC Not distrubed

2 Inlet valves on both

compartments

Not closed

3 CLW storage tank level Not low 1.35 mtr.

4 CLW Pump discharge MOV closed

LUBRICATING WATER PUMP ( For RW Pump)

1 Lub Pump MCC Not distrubed

2 Overhead Storage tank level Not low > 1.7 mtr.

TRIP PROTECTIONS:

S

NO

PARAMETER TRIP CONDN ALARM

VAL

TRIP VAL REMARKS

RAW WATER PUMP

1 RW sump level Low 2.35 mtr.

falling

2.25 mtr.

falling

2 RW Pump disch. headerpressure

High 2.0 Kscrising

10 sec delay

3 Lubrication water pressure High 2. 5 Ksc

falling

4 RW Pump on & disch. MOV notopen

Not open 60 sec delay

CLAEIFIED WATER PUMP

1 CLW storage tank level Low 1.35 mtr.

falling

1.25 mtr.

falling



87/87

2 CLW Pump disch. header

pr.

High

3 CLW Pump on & disch. MOVnot open

Not open 60 sec delay

LUBRICATING WATER PUMP ( For RW Pump)

1 Overhead Storage tank level Low < 1.7 mtr. < 1.8 mtr.

Sludge Pump: Sludge tank lvl high : > 2.3 m ( pump auto start )

Sludge tank lvl high : < 0.4 m ( pump trips )

interlocks & protections-ntpc

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