Protection and Interlock-NTPC

7/27/2019 Protection and Interlock-NTPC

1/89

KAHALGAON STAGE-II 3x500 MW

INDEXSG Side PAGE

NO.1. Master fuel trip 12. Unit purge logic 13 Light oil valve 24 Heavy oil valve 25 Mills 36 Raw Coal feeder 67 ID fan 78 FD fan 9

9 PA fan 1110 BCW pumps 1311 Secondary pre heater 1412 Primary air heater 1613 HPBP 1814 Scanner fan 2015 Seal Air fan 2116 LDO HFO pump 2217 ERV 23

TG Side

1 Turbine Protection 242 Turbine lub oil system 253 Turbine HPCF System 284 Evacuation system 325 Turbine fire protection 366 EHTC 387 GENERATOR AUXLIARIES 418 TDBFP 479 MDBFP 5410 CEP 5911 ACW PUMP 6112 ECW PUMP 6313 LPBP GSPC 6514 AUX PRDS 6615 LP HEATERS 7116 HP HEATERS 7417 DEAERATOR 8018 CW PUMP 8219 CONDENSATE TRANSFER SYSTEM 85

20 LEVEL SETTINGS 86


2/89

PROTECTIONS AND INTERLOCKS DIARY

KAHALGAON STAGE II 3 X 500 MW 1

1. MASTER FUEL TRIP

1. Both ID Fan OFF

2. Both FD Fan OFF

3. Water Wall Circulation Incorrect

4. Both EPB-1,2 Pressed

5. Furnace Pressure Very Low < -175 mm WC

6. Furnace Pressure Very High > 150 mm WC

7. Drum LVL V High TD 10 Sec > 250 mm above NWL

8. Drum LVL V Low TD 5 Sec < -375 mm below NWL

9. Air Flow < 30 % < 600 TPH

10. Loss Of Reheater Protection ( TD 10 Sec)

11. Unit 24 V DC Not Available

12. Unit 220 V DC Not Available ( TD 2 Sec)

13. Less Than FB & Loss of AC in any Elevation in service

14. Unit Flame Failure Trip

15. Loss Of All Fuel Trip

16. All Secondary Air Heaters Off

17. All Boiler Feed Pumps Tripped TD 10 Sec

18. MFT network failure

19. Soft EPB trip

2. UNIT PURGE LOGIC

1 MFT DPUs unfreezed

2 No Boiler Trip Conditions In all the Three Channels

3 Both PA Fans Off.

4 HOTV Closed.

5 All Elevations HONV Closed.

6 LOTV Closed

7 EL AB All LONV Closed.

8 All Feeders Off.

9 All Hot Air Gates Closed.

10 All Elevations Show No Flame.

11 All Auxiliary Air Dampers Modulating.

12 Air Flow < 40% & > 30 %


3/89



3. LIGHT OIL TRIP VALVE

3.1 OPENING PERMISSIVES:

1. Unit 24 V DC Power Available.

2. No Close PB Command3. LO Supply Pressure OK > 15 Kg/cm2

4. EL AB All LONV Closed

5. No Auto Closing Conditions Present.

6. NO MFT

3.2 AUTO CLOSING CONDITIONS:

1. LO Hdr Pr V Low (< 3 Kg/cm2) & EL AB any LONV not closed(

TD 5 Sec) OR

2. Atomising Air Pr. V Low < 3.5 Kg/cm2 ( TD 5 Sec) & EL AB any

LONV not closed & No LO Start/Stop in EL AB OR

3. Master Fuel Trip Operated. 2/3 Logic OR

4. Loss of unit +24V power supply

4.0 EQUIPMENT: HEAVY OIL TRIP VALVE

4.1 OPENING PERMISSIVE:

1. HO Supply Pressure Adequate > 21.2 Kg/cm2 &

2. HO Supply Temperature Adequate > 110 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 Or condition below 8-9 & 24 V Power available

8. HO Recirculation Valve Open &9. No Auto OR Manual close commands.

4.2 AUTO CLOSING CONDITIONS:

1. HO Hdr Temp V Low & Any HONV not closed


4/89



5. EQUIPMENT : MILLS

5.1 MILL READY CONDITIONS :

1. No Pulv Unsuccessful elevation start2. Bunker Outlet Gate open

3. Feeder Inlet Gate open

4. Mill Discharge Valve open

5. Mill start permit from PLOS ( See Conditions Below)

6. Mill Outlet temp not high < 90 C

7. Cold Air Gate open

8. Tramp Iron Hopper Valve open

9. Mill/ Oil Elevation Start Permit

10. No MILL Trip

11. Primary Air Permit Yes

12. All Burner Isolation Gates open

5.2 MILL START PERMIT FROM PLOS:

1. Any Lub Oil Pump ON

2. Sump / Lube Oil Temperature not high < 80 O C

3. LOP discharge pressure not low > 3.5 Kg/cm2

4. Lube Oil Filter DP Not High < 1.5 Kg/cm2

5. Sump Oil Level Adequate (10mm below CL)

6. Lube Oil Pressure Not Very Low > 3 Kg/cm2

5.3 MILL START PERMISSIVES:

1. MILL Ready Conditions As Above

2. SA HDR/ Pulv Bowl DP Adequate > 350 mm WC3. MILL Motor Switchgear Available

4. MILL Status Off & Igntion Permit Available


5/89



MILL PROTECTIONS :

1. Motor Winding Temp V high (TD 5 Sec) > 130 0 C

2. Motor Brg Temp V high ( TD 5 Sec ) > 90 0 C

3. Mill Brg Temp Very High ( TD 5 Sec ) > 90 0 C4. Mill Trip From PLOS

5. Pulv H/W Trip from MCC

6. Pulv on & SA HDR/Bowl DP low( TD 1 Min)< 200 mm WC

7. MFT Acted

8. Pulv. Ignition support required & permit NA

9. Pulv. command On and failed to start TD 10 Sec

10. Pulv. discharge valve not open

11. Any burner isolating gates not open

12. Loss of primary air ( See Conditions Below)

13. PA Trip.( TD J0,H2,G4,F6,E8 Sec)

14. Loss of elevation +24 V power supply

15. EPB pressed

5.4 MILL TRIP FROM PLOS :

1. MILL On and LO Temp high (TD 60 Min)> 80 0 C

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

4. Lube oil level very low.

5.5 LOSS OF PRIMARY AIR CONDITIONS (TRIP):

1. PA HDR Pressure very low < 500 mm WC Or

2. All PA or FD Fans off and fast cut back ONOr

3. PA HDR pressure low (TD 5 Sec) < 625 mm WC

5.6 START PERMISSIVES FOR LOP:

1. Lube Oil Level Adequate

2. No Lube Oil Trip Command

5.7 STOP PERMISSIVES FOR LOP:

1. MILL off > 5 min


6/89



5.8 STANDBY LOP AUTO START CONDITIONS:

1. Lube oil pump running & pressure low < 3.5 kg/cm2

2. Lube oil pump fail to start ( TD 5 Sec)

DESCRIPTION OF PA TRIP : On fast cut back

(Applicable to Mills J,H,G,F,E Progressive time Delay of 2 sec

starting from Mill J whose trip is instantaneous)

1. 5 Or More MILL On & any One Of the Following

2. Any FD Fan Off

3. Any PA Fan Off

4. Loss of BFP - at least 2 BFPs - OFF

5. Loss Of SAH - at least 1 SAH - OFF

6. BCW pumping Not O.K - 2 P/Ps ON & DP 500 mm WC &

2. [All PA or FD Fans off and Any Pulv On and No fast cut back OR

Any PA fan ON and More than 5 Mills not ON] &3. PA HDR pressure low (TD 5 Sec) > 625 mm WC


7/89



6. RAW COAL FEEDER

6.1 START PERMISSIVES:

1. Feeder Switch In Remote &2. MFT Not Acted &

3. Mill Outlet Temp Not low > 55 0 C &

4. Mill Status On &

5. Feeder Seal Air Valve Open &

6. Fdr Speed Min &

7. Mill Ready &

8. Feeder Outlet Gate Open &

9. Mill Ignition Permit Available or mill ignition support not required

6.2 PROTECTIONS:

1. Feeder Switch Not In Remote Or

2. MFT Operated Or

3. Mill Outlet Temp Low < 55 Deg C Or

4. Mill Status Off Or

5. Auto/Manual Stop Command Or

6. Fdr Seal Air valve not open Or7. Fdr On > 5 sec & no coal on belt & Mill Motor current Not low Or

8. Pulv Ignition Permit Not available and Ignition Support Required


8/89



7. ID FAN

7.1 START PERMISSIVES FOR VFD CH-1:

1. VFD CH-1 No Fault

2. VFD Source Breaker On

3. No VFD alarm persisting

4. VFD CH-1 Ready

5. VFD Start Permissive available.

6. VFD CH-2 On Or 7,8 Below

7. Fan Control Damper Posn Min

8. Fan Inlet & Outlet Gates Closed

9. Fan Either Lube Oil Pumps On.

10. Fan Lube Oil Pressure > 0.8 Kg/cm2

11. Fan Motor Temp Not high < 85 o C

12. Fan Brg. Temp Not high < 90 o C

13. Fan Motor & Exciter Winding Temp Not high < 125 o C

14. Fan VFD Aux Supply OK

15. FG Path Available or Other ID Fan On

16. Lube Oil Temp Aft Cooler Not high < 50 o C

17. ID Fan-B Lub oil tank level > MIN

7.2 PROTECTIONS FOR VFD CH-1 :

1. VFD Ch-1 FAULT

2. ID Fan-B Ch-1 SRC Breaker Elect Trip

3. Mtr Brg temp V HI>=90 deg C

4. FAN Brg temp V HI, >=82 deg C

5. Mtr Wdg temp V HI, >=130 deg C

6. MTR Brg Vibration V HI, >=7.1 rms mm/sec TD-05 SEC

7. FAN Brg Vibration V HI, >=19.8 0-p mm/sec TD-05 SEC

8. Exciter Wdg temp V HI, >=130 deg C

9. IDF-A Post Purge TRIP

10. ID Fan-B ON for 30 sec & Disch damper CLSD, TD-05 sec

11. ID Fan-B ON for 30 sec & I/L gate CLSD, TD-05 sec

12. Both ID and both FD ON & FD-B trips

13. EPB pressed


9/89



7.3. ID FAN LOP

1 ON PERMISSIVE:

1. Lub oil tank level not low.

2. No MCC disturbance

2 OFF PERMISSIVE:

1. ID Fan off OR

2. Other LOP on and Lube oil pressure > 0.8 Kg/cm2

3 AUTO ON:

1. ID Fan On & LOP-B trips

2. ID fan ON and Lube oil pressure < 0.6 Kg/cm2

3. LOP-B ON and Lube oil pressure < 0.6 Kg/cm2


10/89



8. FD FAN

8.0.1 START PERMISSIVES:

1. Fan L O Pressure Adequate > 0.8 Kg/cm2

2. Fan Motor Winding Temp Not high < 125 o C

3. Fan Brg Temp Not high < 90 o C

4. Fan Motor Brg Temp Not high < 85 o C

5. Fan Control Oil Pressure Adequate > 8 Kg/cm2

6. Fan Control Damper Position Minimum

7. Fan Outlet Damper Closed

8. Either LOP on

9. FAN Switchgear Available

10. Lub Oil tank level not MIN

11. Fan Lube Oil Cooler O/L Temp. Not High < 50 o C

12. Both ID Fans On & I/L, O/L gates OPEN

13. Either ID Fan On & I/L, O/L gates OPEN & Other FD Fan Off

8.0.2 PROTECTIONS

1. Fan On & O/L Damper Closed (TD 30 Sec)

2. Both FD Fans On & both ID fans ON & ID Fan-B OFF3. Both ID Fans OFF

4. Post Purge Trip From FSSS

5. Fan Brg Temp Very High ( TD 5 Sec)> 110 o C

6. Motor Brg Temp Very High ( TD 5 Sec )> 90 o C

7. Fan Motor Winding Temp V High( TD 5 Sec)> 130 o C

8. Fan/ Motor Vibration V High TD 05 Sec)> 7.1 rms mm/s /19.8 p-p

mm/s

9. EPB pressed


11/89



8.1 EQUIPMENT: FD FAN LOP

ON PERMISSIVE:


OFF PERMISSIVE:

1. FD Fan off OR

2. Other LOP on and conditions at 3-4 below

3. Lube oil pressure > 0.8 Kg/cm2 &

4. Control Oil Pressure > 8 Kg/cm2

AUTO ON:

1. FD Fan On & LOP-B trips

2. FD fan ON and (Lub oil pr < 0.6 Kg/cm2 OR cntrl oil pr < 6

kg/cm2)

3. LOP-B ON and (Lube oil pr < 0.6 Kg/cm2 OR control oil Pr < 6

kg/cm2)


12/89



9 PA FAN

1. START PERMISSIVES:

1. Motor Winding temperature Not High < 125 Deg C

2. Fan Bearing Temperature Not High < 85 Deg C

3. Motor Bearing temperature Not High < 90 Deg C

4. Lub Oil Pressure Adequate > 0.8 ata

5. Control Oil Pressure Adequate > 8 ata

6. Lub Oil Cooler O/L Temperature Not High < 50 Deg C

7. Any Lub Oil Pump On

8. Lub Oil Tank Level Not Low

9. Blade Pitch Position Min < 2 %

10. Fan O/L Damper Closed

11. Both FDs On OR [Any FD ON & PA-B OFF]

12. Both PAPH ON & Air path available OR [Any PAPH ON &

Air path available & PA-B OFF]

13. PA fan start permissible available OR Other pa fan ON

2 PROTECTIONS:

1. MFT Operated2. Temperature V. Hi [ DE & NDE] >=110 deg C

3. Brg temp V HI >=90 deg C

4. Mtr Wdg temp V HI >=130 deg C

5. MTR Brg Vibration V HI [RMS] >=7.1 rms mm/sec TD-05 SEC

6. FAN Brg Vibration V HI[Peak] >=19.8 0-p mm/sec TD-05 SEC

7. Both FD Fans Off

8. PA Fan-B On & O/L Damper Closed TD 35 SEC

9. EPB pressed


13/89



9.1 PA FAN LOP

ON PERMISSIVE:


OFF PERMISSIVE:

1. PA Fan off OR

2. Other LOP on and conditions at 3-4 below

3. Lube oil pressure OK > 0.8 Kg/cm2 &

4. Control Oil Pressure OK > 8 Kg/cm2

OFF PERMISSIVE:

1. PA Fan On & LOP-B trips

2. PA fan ON and (Lube oil pr < 0.6 Kg/cm2 OR control oil pr < 6

kg/cm2)

3. LOP-B ON and (Lube oil pr < 0.6 Kg/cm2 OR control oil pr < 6

kg/cm2)


14/89



10 EQUIPMENT: BOILER CIRCULATING PUMP

10.1 START PERMISSIVE:

1. BCW PUMP-C Disch. Valve-1 OPEN

2. BCW PUMP-C Disch. Valve-2 OPEN

3. BCW PUMP-C Cooling water flow Not low >=32 gpm

4. BCW PUMP-C motor cavity Temp. O.K >2o C & 60C TD 5 Sec

2. Discharge V/V Stem-1 Not Open

3. Discharge V/V Stem-2 Not Open

10.3 BCW CW BOOSTER P/P

AUTO START CONDITIONS:

1. Running Other Pump Tripped. Or

2. Other P/P On & Discharge Pressure Low< 3.5 Kg/cm2

3. MCC Disturbance Not Present

4. Local Intervention Not There

OFF PERMISSIVES:1. Boiler Not Working Or

2. Other Pump On & Discharge Pressure Not Low.

Auto OFF:

1. Overhead tank level high


15/89



11 EQUIPMENT : SECONDARY AIR HEATER.

START PERMISSIVES : Electrical Motor

1. Guide Bearing oil temp Not high < 70 o C

2. Support Bearing oil temp Not high < 70 o C

START PERMISSIVES : Air Motor

1. Thrust Brg Temp Not high < 70 o C

2. Guide Brg Temp Not high < 70 o C

3. Electrical motor OFF

INTERLOCKS :

AUTO ON:

If SAH Electric Motor Trips Air Motor takes start in auto in 1.5 sec

AUTO OFF:

If SAH Electric Motor takes start , Air Motor Stops in auto.

13.4 Air Motor running status from pr switch (setting 3.0 kg)

13.5 Fire sensing alarm (setting 450C)

11.1 SAH GUIDE BEARING LOP

START PERMISSIVES:

1. MCC Not Disturbed.

AUTO ON:

1. Other LOP OFF and start command

2. LOP-B On & LUb oil flow low (


16/89



11.2 SAH SUPPORT BEARING LOP

START PERMISSIVES:

1. Guide Bearing Temperature not low > 35 o C

2. No Auto Off Command3. MCC Not Disturbed.

AUTO ON:




17/89



12 PRIMARY AIR HEATER.

START PERMISSIVES : Electrical Motor

1. Guide Bearing oil temp Not high < 70 o C

2. Support Bearing oil temp Not high < 70 o C

3. No auto Off Command from SGC

4. Electrical motor MCC Not Disturbed.

START PERMISSIVES : Air Motor

1. Thrust Brg Temp Not high < 70 o C

2. Guide Brg Temp Not high < 70 o C

INTERLOCKS :

AUTO ON:

If SAH Electric Motor Trips Air Motor takes start in auto in 1.5 sec

AUTO OFF:

If SAH Electric Motor takes start , Air Motor Stops in auto.

19.4 Air Motor running status from pr switch (setting 3.0 kg)

19.5 Fire sensing alarm (setting 450C)

12.1 PAH GUIDE BEARING LOP

START PERMISSIVES:


2. No Auto Off Command


AUTO ON:




18/89



AUTO OFF:

1. Bearing temp < 35C

2. OFF CMD

12.2 PAH SUPPORT BEARING LOP

START PERMISSIVES:


2. No Auto Off Command


AUTO ON:




19/89



13 HP BYPASS SYSTEM

13.1 OIL SUPPLY PUMP FOR HP BYPASS

1. Pump off: >150 Kg/cm2

2. Pump on: 160 Kg/cm2

4. Pressure too low: 8 Kg/cm2

6. Any one of the above & No Priority close

2 BP VALVE PRIORITY CLOSE CONDITIONS:

1. Condenser vacuum low < 0.6 Kg/cm2 OR

2. Selected Downstream temp signal v high > 480 0 C

3 BP VALVE AUTO BLOCKING CONDITIONS:

1. BP Valve Priority Close Command OR

2. BP Valve Position Transmitter failed. OR3. OSU-1 & OSU-2 Oil Pressure Very Low. OR

4. MSL PR TX Disturbed.

4 BD VALVE AUTO OPEN CONDITIONS:

1. BP Valve PI demand > 2% OR

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


20/89



5 BD VALVE AUTO CLOSE CONDITIONS:

1. No auto open command AND

2. BD valve LS FB Open.

6 BPE VALVE AUTO BLOCKING CONDITIONS:

1. BPE both DS Temp Signal disturbed

2. BPE Valve Position TX failed

3. BP-1 Auto Command blocking yes

4. BPE-1 Temp TX Deviation high


21/89



14 EQUIPMENT: AC SCANNER AIR FAN


1. No MFT & Scan - Furnace DP Low( TD 10 Sec) < 150 mm WC

2. ON Order from APS/SGC

3. Scanner Air Fan B (DC fan) did not take start within 5 sec. after

receiving the start command

PERMISSIVE FOR OFF:

1. Either MFT Operated or Scan Duct To Furnace DP Not Low &

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

PROTECTION OFF:

1. If both the fans did not take start within 5 sec. Off command is

generated, OFF command will be issued to the fan after 10

sec.Either MFT Operated or Scan Duct To Furnace DP Not Low

&

14.1 DC SCANNER AIR FAN


1. No MFT & Scan - Furnace DP Low( TD 10 Sec) < 150 mm WC2. ON Order from APS/SGC

3. Scanner Air Fan A (AC fan) did not take start within 5 sec. after

receiving the start command

PERMISSIVE FOR OFF:

1. Either MFT Operated or Scan Duct To Furnace DP Not Low &

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

PROTECTION OFF:

1. If both the fans did not take start within 5 sec. Off command is

generated, OFF command will be issued to the fan after 10

sec.Either MFT Operated or Scan Duct To Furnace DP Not Low

&


22/89



15 EQUIPMENT: SEAL AIR FAN


Either PA Fan On & SA HDR/CA Duct DP Low(TD 10 Sec) < 100 mm

WC

PROTECTION OFF CONDITIONS:

1. Both fan Started TD 10 Sec Or

2. Fan Breaker Tripped On Overload Or

3. Both PA Fans Off ( TD 15 Sec)

PERMISSIVE OFF CONDITIONS:

1. Both Fans Running &

2. Scan-Furnace DP Not Low

3. VPC/Pushbutton Off Command

START PERMISSIVES:

Outlet Damper LS Feedback Closed


23/89



16. LDO PUMP

START PERMISSIVE

1) MCC not disturbed

2) Pump not running3) Suction pressure not low (>-0.1 ksc)

4) LDO Storage tank level not very low

TRIP PROTECTION

1) Pump overload

2) LDO tank level very low

3) LDO suction pressure before strainer low (-0.1 ksc)

4) LDO Storage tank level not very low

TRIP PROTECTION

1) Pump overload

2) LDO tank level very low

3) LDO suction pressure before strainer low (


24/89



17. ERV Settings

Set pressure KSGSl.

No.

Location Valve Tag NO

Open Close

1 MS LINE (L) SV 9 185.5 180.3

2 MS LINE (L SV 10 185.5 180.33 MS LINE (R) SV11 186.6 180.64 MS LINE (R) SV12 186.6 180.65 MS LINE (R) SV13 186.6 180.66 RH LINE (L) SV 22 48.0 46.67 RH LINE (L) SV23 48.0 46.68 RH LINE (R) SV24 48.5 47.19 RH LINE (R) SV25 48.5 47.1


25/89



1. TURBINE PROTECTIONS

Sr.

No.

Description Alarm Set

point

Trip set point

1) TG Lub oil pressure very low (< 4.5ksc) (< 1.2 ksc)

2) Axial shift high (+/-0.5 mm) (+/- 1.0mm)

3) HP exhaust temp. high (> 480 degc) (> 500 degc)

4) Condenser vaccum low(VSP) --- ---

5) Condenser vaccum low(FSP) AND

Turbine speed > 240 rpm

(> -0.8 ksc) (> -0.7 ksc)

6) HP casing top/btm DT high AND Load

>100MW

(> 90 degc) (> 100 degc)

7) IP casing front top/ btm DT high AND

Load >100MW

(> 90 degc) (> 45 degc)

8) IP casing rear top/ btm DT high AND

Load >100MW

(> 90 degc) (> 45 degc)

9) MFT S/W & H/W --- ---

10) Generator electrical protection S/W &

H/W

--- ---

11) Liquid in Generator Main leads top ----- (> 90 mm)

12) Cold gas temp after cooler A&B high (> 55 degc) (> 60 degc)

13) Cold gas temp after cooler C&D high (> 55 degc) (> 60 degc)

14) Primary water temp after cooler high (> 55 degc) (> 60 degc)15) Seal oil temp after cooler high AS (> 50 degc) (> 60 degc)

16) Hot air main exciter temp high (> 75 degc) (> 80 degc

17) Stator winding flow very low (< 48 tph) (< 54 tph)

18) Stator Main bushing R flow low (< 1.4 tph) (< 1.33 tph)

19) Stator Main bushing S flow low (< 1.4 tph) (< 1.33 tph)

20) Stator Main bushing T flow low (< 1.4 tph) (< 1.33 tph)

21) Turbine over speed trip (electrical) (> 3300 rpm) (> 3330 rpm)

22) Turbine over speed trip H/W

23) Oil tank level very low ( 1000 mm

from top)

( 1150 mm

from top)

24) Turbine trip from desk operated 90 degC 130 degC

25) Turbine trip from bearing temp hi --- ---

26) Turbine trip from ATRS --- ---

27) Emergency trip from HMI --- ---

28) Fire protection 1 or 2 operated --- ---

29) Generator class B protection --- ---

30) Low Vacuum Trip Device operated --- ---

31) Manual Trip Device operated --- ---


26/89



2. TURBINE LUB OIL SYSTEM

2.1 AOP - 1

AUTO START1) SGC oil supply ON

2) SLC AOP -1 ON AND [ AOP -2 trippd OR Oil Pr < 4.8 ksc ]

AUTO STOP

1) SGC Oil Supply start-up step - 9 command

2) SGC Oil Supply shutdown step - 55 command

PROTECTION STOP

1) Oil tank level very low

2) Fire protection - 2 operated

2.2 AOP - 2

AUTO START

1) SLC AOP -2 ON AND [ AOP -1 tripped OR Oil Pr < 4.5 ksc ]

AUTO STOP1) SGC Oil Supply start-up step - 9 command

2) SGC Oil Supply shutdown step - 55 command

PROTECTION STOP



2.3 EOP

PROTECTION ON

1) SLC EOP ON AND Lub oil pressure < 1.1 ksc

2) Lub oil pressure < 1.1 ksc AND

[ HP casing top mid temp > 120 degc OR

HP casing bottom mid temp > 120 degc ]

3) Lub oil press < 1.1 ksc ( Direct to DC Starter)

( Direct from Pr. Switch with SLC EOP-ON (MCM.Relay))


27/89



2.4 JOP -1

START PERMISSIVE

1) JOP -3 OFF

AUTO START

1) SLC JOP-1 ON AND Turbine Speed < 510 rpm

AUTO STOP

1) SLC JOP -1 ON AND Turbine Speed > 540 rpm

2) Turbine Speed < 510 rpm AND

Jacking oil pressure < 150 ksc AND

SLC JOP -3 ON TD15s

3) Turbine Speed < 2800 rpm ANDJOP -1 Voltage failed AND SLC JOP - 3 ON

4) JOP -1 Tripped AND SLC JOP -3 ON

5) SGC Oil Supply shutdown Step 54 command

PROTECTION STOP



2.5 JOP - 3

START PERMISSIVE

1) JOP -1 OFF

AUTO START

1) JOP -1 Tripped AND SLC JOP -3 ON

2) Turbine Speed < 510 rpm AND Jacking oil pressure < 150 ksc

ANDSLC JOP -3 ON TD10s

3) Turbine Speed < 2800 rpm AND

JOP -1 Voltage failed AND SLC JOP - 3 ON

PROTECTION STOP

1) Oil tank level very low( > 1150 mm from top)



28/89



2.6 TURNING GEAR

OPEN PERMISSIVE

1) Turbine speed > 15 rpm OR

2) Seal oil pr. H2 side > 7.0 ksc AND

Seal oil Air to H2 side DP TE > 1.2 ksc AND

Seal oil Air to H2 side DP EE > 1.2 ksc

AUTO OPEN

1) SLC Turning gear ON AND Turbine Speed < 210 rpm

AUTO CLOSE

1) SLC Turning gear ON AND Turbine Speed > 240 rpm

2) SGC Oil Supply shutdown step -51 command

PROTECTION CLOSE

1) Lub oil pressure < 1.2 ksc

2.7 OIL TEMP CONTROL V/V

AUTO OFF

1) SGC oil supply shutdown step -55 command

2.8 OIL VAPOUR EXTRACTOR -1

AUTO START

1) Other vapour extractor tripped

2) SGC oil supply start-up step -2 command

AUTO STOP

1) Standby Oil vapour extractor ON

2.9 OIL VAPOUR EXTRACTOR-2

AUTO START

1) OVE- 1 OFF and Disc

2.10 LEAKAGE OIL PUMP

AUTO START

1) Leakage oil tank level > 50%

AUTO STOP

1) Leakage oil tank level < min


29/89



3 TURBINE HPCF SYSTEM

3.1 HP CONTROL FLUID HEATER

RELEASE ON1) Any HPCF circulation pumps ON AND

HPCF temp control vlv closed

AUTO ON

1) Control flow heater temp < 50 degc

2) SLC HPCF heating ON AND

HPCF tank fluid temp < 55 degc AND

HPCF temp control vlv closed

AUTO OFF

1) SGC HPCF shutdown step - 51 command

2) Control flow heater temp > 65 degc

3) SLC HPCF heating ON AND

[ HPCF tank fluid temp > 57 degc OR HPCF temp control vlv not

closed ]

PROTECTION OFF1) Control flow heater temp > 75 degc

2) Fire Protection-1 operated

3) Fire Protection-2 operated

4) Both HPCF circulation pumps OFF

3.2 HP CONTROL FLUID PUMP - 1

AUTO START

1) SLC HPCF Pumps ON AND HPCF pump 2 discharge pr. < 26

ksc

2) SLC HPCF Pumps ON AND HPCF pump 2 tripped

AUTO STOP


PROTECTION OFF

1) Fire Protection-1 OR Fire Protection-2 operated


30/89



3.3 HP CONTROL FLUID PUMP- 2

AUTO START

1) SLC HPCF Pumps ON AND HPCF pump 1 discharge pr. 30 ksc

2) HPCF Vapour Extractor - 2 tripped

3.5 HPCF VAP EXTR-2

AUTO START

1) HPCF Vapour Extractor - 1 tripped

3.6 HPCF CIRCULATION PUMP-1

START PERMISSIVE

1) HPCF Circulation pump-2 OFF

AUTO START

1) SGC HPCF on ANDHPCF press. > 30 ksc AND

Any HPCF Vap Extractor ON

AUTO STOP


PROTECTION OFF

1) HPCF tank level < min

2) Fire Protection -1 OR Fire Protection -2 operated


31/89



3.7 HPCF CIRCULATION PUMP-2

START PERMISSIVE

1) HPCF Circulation pump-1 OFF

AUTO START

1) HPCF press > 30 ksc AND

HPCF pump-1 off TD5s

AUTO STOP


PROTECTION OFF

1) HPCF tank level < min2) Fire Protection -1 OR Fire Protection -2 operated

3.8 HPCF TEMP CONTROL VALVE

AUTO OFF



32/89



3.9 HPCF ALARMS

1) Leakage Level High

Leak speed chang device >Min OR

Leak press TRANS INJW >Min OR

Over speed governor >Min

2) Hydraulic control fluid pressure low.

HPCF Pressure after pump -1 < 26 ksc AND

HPCF Pressure after pump -2 < 26 ksc AND

Turbine speed > 15 rpm

3) HPCF Filter DP high

Filter Supply Units DP > 0.6ksc OR

CF filter DP > 0.6ksc OR

LP Bypass filter DP > 0.6 ksc

4) Water CF Tank High

CF Conductivity High

5) HPCF Temperature Low/Fault < 50 degc

6) HPCF Temperature High/Fault > 60 degc

7) HPCF Pumps Fault

SLC HPCFs on with 10 sec delay AND

Any HPCF auto on command

8) HPCF Tank temp. low < 20 degc9) CONTIN Flow heater >75 degC

9) HPCF Tank level high > 59 % < 650 mm from top

10) HPCF Tank level low < 53 % > 800 mm from top

11) HPCF Tank level very low < 50 % > 750 mm from top

12) VAP EXTR System trouble

Both HPCF VAP EXTR- NOT ON AND

HPCF pr > 30 Ksc


33/89



4 EVACUATION SYSTEM

4.1 VACCUM PUMP 1 & 2

RELEASE START1) SEP water level > MIN

RELEASE STOP

1) System inlet valve closed

AUTO START

1) SGC Start-up Step-3 command

2) SLC vacuum pumps on AND Condenser pressure > 0.15 ksc

AUTO STOP

1) Through SGC Evacuationstep-51 command

2) SGC Evacuation start-up Step- 7 command AND Vacuum pump

selected

4.2 VACCUM PUMP SOL INLET VALVE 1 & 2

RELEASE OPEN1) Differential pressure across Inlet valve 0.15 ksc

AUTO CLOSE

1) SGC Evacuation shutdown step-51 command

2) SGC Evacuation start-up Step- 7 command AND Vacm pump

selected

4.3 SEAL WATER RECIRCULATION PUMP 1 & 2

ON RELEASE1) Separator water level > 360 mm

1) Vac p/p -2 ON


34/89



AUTO START

1) SGC start-up Step 3 command

2) SLC vacuum pumps on AND Condenser pressure > 0.15 ksc

CLOSE RELEASE

1) Vacuum pump OFF

AUTO CLOSE

1) SGC Evacuation shutdown step-51 command

2) SGC Evacuation start-up Step- 7 command

3) Vacuum pump OFF

4.4 MAKE UP SOLENOID VALVE 1 & 2

AUTO OPEN

1) Level in separator tank < 330 mm

AUTO CLOSE

1) Level in separator Tank > 360 mm TD5s

4.5 SEAL STEAM CONDENSER EXHAUST VALVE 1/2

AUTO OPEN

1) SGC evacuation start-up step 1 command

2) Seal steam condenser other exhaust tripped (OFF or DISC)

AUTO CLOSE

1) SGC Evacuation Shutdown step 53 command

( Vacuum breaker open status is required).

PROTECTION CLOSE

1) Seal steam condenser level High.

4.6 SEAL STEAM CONDENSER SEAL VALVES

AUTO OPEN


RELEASE OPEN1) Integral bypass valve open TD-5sec.


35/89



PROTECTION CLOSE

1) Seal steam condenser level-2 High

4.7 INT BYPASS VALVE FOR SEAL STEAM CONDENSER

SEAL VALVES

AUTO OPEN

1) Seal steam condenser seal valve

AUTO CLOSE

1) Seal steam condenser seal valve open

4.8 SEAL STEAM CONDENSER SAFETY VALVE

AUTO OPEN

1) Seal steam condenser level-2 High.

RELEASE OPEN

1) Integral bypass valve open TD-5sec.

AUTO CLOSE


4.9 INT BYPASS VALVE FOR SEAL STEAMCONDENSER

SAFETY VALVES

AUTO OPEN

1) Seal steam condenser LEVEL -2 HIGH

PROTECTION CLOSE

1) Seal steam condenser SAFETY valve open

4.10 SEAL STEAM VAP EXHAUST ISOL VALVE - 1/2

AUTO OPEN

1) Seal steam condenser exhaust ON

AUTO CLOSE

1) Seal steam condenser exhaust OFF


36/89



4.11 EVACUATION ALARMS

1) Seal steam condenser level high

Seal stm Cond lvl -1 high

Seal stm Cond lvl -2 high

2) Seal steam Condenser Valve Position Fault

Seal stm cond SOV limit switch not open or not closed AND

Seal stm Cond level -1 high AND

Seal stm Cond level -2 high

3) Seal Stm Cond Fault

Seal stm cond lvl -2 high TD1m AND

Seal stm cond SOV not open OR not closed

4) Switch OFF Stand by Vaccum Pump

Both Vacuum Pumps ON AND

Generator Load > 5 % AND

Condenser Press < 0.15 ksc

5) Switch ON Stand by Vaccum Pump

Generator Load > 5 % AND

Condenser Press > 0.15 ksc

6) Separator Water level < min

Sep-1 water lvl < min

Sep-2 water lvl < min7) SW Flow Low

CW recirculation pump 1 ON AND

SW Flow vac pump -1 < 14 m3/hr OR

CW recirculation Pump 2 ON AND

SW Flow vac pump -2 < 14 m3/hr

8) SLC Vaccum pump not ON

SLC Vaccum pumps OFF AND

Turbine Speed > 15 rpm

9) VP Seal stm temp hi

VP-1 Seal stm temp 40 degC

VP-2 Seal stm temp 40 degC

10) Seal Stm Cond Exh tripped

Seal stm cond Exh.1 tripped

Seal stm cond Exh.2 tripped


37/89



5. TURBINE FIRE PROTECTIONS

FIRE PROTECTION-1 OPERATED WILL COME WHEN

[Fire Protection-1 PB pressed in UCR.Fire Protection-1 PB pressed in MBLD-1

Fire Protection-1 PB pressed in MBLD-2] ] OR Fire protection -2

initiated

This will cause

Opens the vacuum Breaker on Protection

SGC HP CTRL FLUID OFF

SLC CTRL FLUID HTG OFF

SLC CTRL FLUID PUMPS OFF

Stops HPCF P/Ps

Stops HPCF Heater

Stops HPCF Recirculation P/Ps

Trips the Turbine

* The vacuum Breaker will open on Protection if

[Fire protection -1 initiated OR MOT level very low]

AND Generator Breaker OFF


38/89



FIRE PROTECTION-2 OPERATED WILL COME WHEN

1) MOT level very low OR

[Fire Protection-2 PB pressed in UCR. OR

Fire Protection-2 PB pressed in MBLD-1 ORFire Protection-2 PB pressed in MBLD-2]

This will Cause

Switch Off the SGC Oil Supply Program

Stops AOP-1 on protection

Auto OFF SLC AOP-1

Stops AOP-2 on protection

Auto OFF SLC AOP-2

Auto ON SLC EOP

Auto OFF SLC JOP-1

Stops JOP-1 on protection

Stops JOP-2 on protection

Starts JOP-3 on protection

Auto OFF SLC JOP-3

Auto OFF SLC Turning Gear

Trips the Turbine


39/89



6. EHTC

SPEED REFRENCE TRACKS ACTUAL SPEED WHEN

1) ( Load ctlr. o/p > speed ctlr. o/p + 5 % ) AND

Speed actual < 3030 rpm AND

Speed actual > 2940 rpm AND load ctlr. ON

2) Turbine tripped

SPEED REF DELAYED IS RESTRICTED IF

1) Generator breaker not ON AND

( NrTD - Nactual ) > 50 rpm

2) Generator breaker not ON AND

[ Power set point block OR TSC on & faulty] AND

Speed ref > speed ref delayed AND

Speed actual > 2850 rpm

DN/DT ACTS WHEN

1) Speed slope value low ( < 108 rpm / min ) AND

Speed ctlr. output > 0 % ANDSpeed actual Nact > 725 rpm AND

Speed actual Nact > 2850 rpm AND

Generator breaker not on AND

HP ESV # 1 not close AND

HP ESV # 2 not closed AND

Speed set point not balanced AND

Nr > 650 rpm

LOAD REFERENCE TRACKS ACTUAL LOAD WHEN

1) Pressure ctlr. in action AND IP mode selected AND Load actual

< 30 %

LOAD CTRLR BECOMES ON / OFF ONLY WHEN

1) ( Speed ctlr. output > load ctlr. output ) AND Speed ctlr. in

action


40/89



ISOLATED GRID IS DETECTED WHEN

1) Speed > 84.33 % AND Load ctlr. not off AND

Load error > 8.4 % for 6 sec. AND

Speed ctlr. not in action AND Pressure ctlr. not in action

ISOLATED GRID RESETS WHEN

1) Generator breaker off

2) load error < 8.4 % AND Reset command given

LOAD CTLR.O/P TRACKS PR. CTLR.O/P+2% WHEN

1) Press ctlr. in action AND

Actual load > final load set pt AND Load < load ref.

LOAD CTLR. O/P TRACKS SPEED CTLR. O/P WHEN

1) ( Pact. < station load AND Load ctlr. error > 5 %)

2) Generator Breaker off

3) Load ctlr. off AND Pressure ctlr not on

LIMIT PRESSURE MODE CAN BE SELECTED IF

1) Boiler ctlr. not tripped to manual ( is in auto ) AND

Turbine follow Boiler from CMC not selected AND

IP mode not selected from OWS

INITIAL PRESSURE MODE GETS SELECTED IF

1) Boiler ctlr. is in manual

2) Turbine follow Boiler from CMC not selected

3) IP mode selected from OWS

SPEED CTLR. IN ACTION IF

1) Generator Breaker off

2) Turbine Tripped Ch - 1/Ch -2

3) Speed ctlr. o/p+100% < max(speed ctlr. o/p, load ctlr. o/p)

4) Speed ctlr. o/p > Load ctlr. o/p


41/89



LOAD CTLR. IN ACTION IF

1) Load ctlr. not off AND

Isol. Grid not detected AND

[ Speed OR Press. ctlr. not in action ]

PRESS. CTLR. IN ACTION IF

1) Press. ctlr. o/p < min [ (Speed ctlr. o/p + 100 %) ,

max(speed ctlr. o/p , load ctlr. o/p) ]

TRACKING DEVICE CAN BE MADE ON IF

1) EHTC fault is not persisting ANDStarting device position healthy AND

EHC posn. 1 and 2 healthy AND

Speeder gear posn. Healthy AND

Plunger coil healthy AND

Tracking device no off cond. AND

Turbine tripped not present AND

No EHTC fault AND

Speed signal no fault


42/89



7 GENERATOR AUXILIARIES

7.0 PRIMARY WATER PUMP 1 & 2

AUTO START1) SLC PW pumps on AND PW Tank level > 155mm

AND Other PW pump off

2) SLC PW pumps on AND

PW Tank level > 155mm AND

Other PW pump on AND Pressure after other PW pump < 5 ksc

STOP PERMISSIVE

1) Stand by PW Pump on AND PW press. after std by pump > 5

ksc TD5s

2) SLC PW pumps off.

7.1 NaOH DOSING PUMP

START RELEASE

1) Treated water flow > min

AUTO START

1) Conductivity after ion exchanger < 1us/cm

AUTO STOP

1) Conductivity after ion exchanger > 3 us/cm TD10s OR

2) Conductivity after main filter > 2.5 us/cm TD10s OR

2) NaOH tank level < min

PROTECTION STOP

1) Treated water flow < min

7.2 PW TEMP CONTROL VALVE

PROTECTION OPEN

1) PW inlet temp > 66 degc


43/89



7.3 SEAL OIL PUMP - 1 AIR SIDE

AUTO START

1) SLC SO Pump (AS) on AND

SO storage tank level not low AND SO pump 2 (AS) off


SO storage tank level not low AND

SO pump 2 (AS) on AND SO pr after SOP-2 (AS) < 05 ksc TD2s

3) SO p/p-2 OFF and SO p/p-2 discrepancy

4) SGC Gen seal oil Start-up step-1 command

STOP PERMISSIVE

1) SO pump 2 (AS) on AND SO pr after SOP-2 (AS) > 5 ksc TD5s

2) SLC SO pump (AS) off

7.4 SEAL OIL PUMP - 2 AIR SIDE

AUTO START


SO storage tank level not low AND

SO pump 1 (AS) on AND SO pr after SOP-1 (AS) < 5 ksc TD2s

2) SLC SO Pump (AS) on AND SOP-1 (AS) OFF and

discrepancy .

STOP PERMISSIVE

1) SO pump 1 (AS) on AND SO pr after SOP-1 (AS) > 5 ksc TD5s

2) SLC SO pump (AS) off

7.5 SEAL OIL PUMP - 3 AIR SIDE (DC)

AUTO START

1) DC SOP local PB On command with local selected

2) SLC DC SOP - 3 On AND SO/H2 DP (TE/EE) < 0.9 ksc TD2s

3) SLC DC SOP - 3 On AND

[ SO pump 1 (AS) OFF OR SO pr after SOP -1 (AS)


44/89



STOP PERMISSIVE

1) SO pump 1 (AS) on AND SO pr after SOP -1 (AS) > 5 ksc

TD5s

2) SO pump 2 (AS) on AND SO pr after SOP -2 (AS) > 5 ksc

TD5s

3) SLC DC SO pump 3 off.

MANUAL STOP

1) DC SOP local PB off command with local selected

2) Remote selected & Remote off command

7.6 SEAL OIL PUMP - 4 H2 SIDE

START PERMISSIVE1) Any Seal oil pump (AS) on AND Seal oil tank level > min

AUTO START

1) SGC Gen seal oil start-up Step 3 Command

PROTECTION STOP

1) Seal oil tank level low

2) SOP Pressure air side < 4.5 ksc TD3s

7.7 BEARING EXHAUST FAN 1 & 2

AUTO START

1) SLC Brg exhaust fan on AND

Other Brg exhaust Fan on AND

Press at respective Brg exhaust fan > -5 mbar TD2s

2) SLC Brg exhaust fan on AND Other Beg exhaust Fan off

3) SGC Gen seal oil start-up step-1 command

STOP PERMISSIVE

1) Other Brg exhaust fan on AND

Press at respective Brg exhaust < -5 mbar TD5s

2) SLC Brg exhaust fan Off

7.8 EXCITER AIR DRIER

AUTO ON1) SLC Air Drier on AND Turbine speed < 210 rpm


45/89



OFF PERMISSIVE

1) Exciter Shut down Heater off

AUTO OFF

1) Turbine speed > 240 rpm AND

Exciter Shut down Heater Off AND SLC Air Drier On

7.9 EXCITER SHUT DOWN HEATER

ON PERMISSIVE

1) Air drier on

AUTO ON

1) SLC air drier on AND Air Drier On ANDTurbine speed 240 rpm OR Cold air temp >50 degc]

PROTECTION OFF

1) Cold air temp > 90 degc

2) Air drier off

7.10 CO2 FLASH EVAPORATOR

AUTO ON

1) SLC CO2 Flash Evaporator On AND

CO2 Flash Evaporator temp. < 145 degc

AUTO OFF:1) SLC CO2 flash evaporator off

PROTECTION OFF:

1) CO2 Flash Evaporator temp. > 150 degc

7.11 COLD GAS TEMP CONTROL VALVE

PROTECTION ON

1) Cold gas temp > 55 degc


46/89



7.12 GAS DRIER HEATER

START PERMISSIVE:

1) Gas drier blower ON for 10 min

AUTO ON

1) SLC gas drier ON AND Air temp at drier outlet < 60 degc

TD10s

AUTO OFF

1) Air temp. at Gas exhaust > 100 degc

PROTECTION OFF

1) Gas drier blower off2) Gas drier heater temp > 150 degc

3) Gas drier blower ON for 4 hrs

7.13 GAS DRIER BLOWER

START PERMISSIVE

1) Gas drier blower LS-1 OR 2 open

AUTO ON

1) SLC gas drier ON

OFF PERMISSIVE

1) Gas drier heater off

AUTO OFF

1) SLC gas drier ON AND Air temp. at drier O/L < 60 C AND Htr

not On


47/89



7.14 GAMP ALARMS

1) Oil level in Pre chamber (TE/EE) High

2) Liquid at main leads bottom High

3) Liquid at main leads top High

4) Level in SOST low

5) Pressure after AC SOP -1/2 (AS) low ( < 5 ksc)

6) Pressure after DC SOP -3 (AS) low ( < 5 ksc)

7) Pressure after AC SOP -4 (H2S) low ( < 5 ksc)

8) DP across SO filter AS/H2S High ( > 0.9 ksc)

9) SO Pr. (TE/EE) Air side Low ( < 4.5 ksc)

10) SO temp after cooler (AS) High (> 50 degc)

11) SO temp after cooler (H2S) High (> 50 degc)

12) SO temp after cooler V High (> 55 degc)

13) SO/H2 Diff Pr (TE AND EE ) High (>1.7 ksc)

14) SO/H2 Diff Pr (TE AND EE ) low (< 0.9 ksc)

15) H2 Pressure in Manifold low ( < 15 ksc)

16) H2 Pressure in Gen Casing low ( < 3.3 ksc)

17) H2 Pressure in Gen Casing High ( > 3.8 ksc)

18) H2 purity in Gen Casing low ( < 95 %)

19) PW Pr. after Pump low (< 5 ksc)

20) DP Pr. Winding High ( > 1.5 ksc)

21) PW temp after cooler V High ( > 55 degc)

22) Stator Wdg Flow low ( < 54 m3/hr)

23) Stator Wdg Flow V low ( < 48 m3/hr)

24) Flow through R bush V low ( < 1.33 m3/hr)

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

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

27) PW Pr. at stator Wdg I/L High ( > 3.8 ksc)

28) Hot Gas temp. Coolers A AND B High ( > 60 degc)

29) Hot Gas temp. Coolers C AND D High ( > 60 degc)

30) Cold Gas temp. Coolers A AND B High ( > 55 degc)

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

32) Cold Gas temp. Coolers V High ( > 60 degc)

33) Temperature Hot Air Main Exciter High ( > 75 degc)

34) Temperature Hot Air Main Exciter V High ( > 80 degc)

35) PW press. Stator I/L Low ( < 2.8 ksc)

36) SO Pr. AS (TE/EE) Low ( < 4.9 ksc)

37) PW temp at o/l High ( > 60 degc)

38) Conductivity after Winding High ( > 3 uS/cm) TD5m

39) Conductivity after main filter High ( > 3 uS/cm) TD5m

40) Conductivity after Ion exchanger low (< 1uS/cm) TD5m


48/89



8 TDBFP

8.1 PROTECTION

1) TDBFP working AND suction flow very low ( < 100 tph )

2) Deaerator level very low ( < -1610 mmwc)

3) TDBFP Lub oil header press. very low ( < 1.0 ksc)

4) TDBFP Suction valve not open

5) TDBFP Exhaust stm temp very high ( > 120 degc)

6) TDBFP Live steam pressure very high ( > 12.5 ksc)

7) TDBFP Exhaust steam pr. very high ( > -0.6 ksc)

8) Governing oil press. very low ( < 4.5 ksc)

9) Trip oil press. very low ( < 2 ksc)

10) Turbine Axial shift high ( > 0.7 mm)

11) Turbine eccentricity very high ( > 92 mic)

12) Trip PB operated

13) Trip command from OWS

14) Turbine over speed ( > 6300 rpm )

15) Turbine GB i/p vibration very high ( > 70 mic)

16) Turbine GB o/p vibration very high ( > 70 mic)

17) Turbine FJB vibration very high ( > 70 mic)

18) Turbine RJB vibration very high ( > 70 mic)19) Turbine GB brg temp very high ( > 120 degc)

20) Turbine bearing temp very high ( > 120 degc)

21) Booster pump brg temp very high ( > 95 degc)

22) Booster pump thrust brg temp very high ( > 105 degc)

23) BFP thrust brg temp metal very high ( > 105 degc)

24) BFP brg temp very high ( > 95 degc)

25) FW Suction / disch DT high ( > 15 degc )

26) TDBFP working AND suc flow < Variable set point trip


49/89



8.2 TDBFP PERMISSIVES

TDBFP Suction valve open AND

Deaerator level adequate AND

TDBFP Casing top/ btm DT < 20 degc AND

Condenser press. < -0.5 ksc AND

Lub oil header press. > 1.5 ksc AND

BFP LOP p/p disch pr > 12.5 kg

Lub oil temp after clr < 45 degc AND

Governing oil press. > 6.5 ksc AND

TDBFP gearbox brg temp < 105 degc AND

TDBFP turbine brg temp < 105 degc AND

TDBFP journal brg temp < 90 degc AND

TDBFP thrust brg temp < 100 degc ANDTDBFP BP journal brg temp < 90 degc AND

TDBFP BP thrust brg temp < 100 degc AND

Any LOP ON AND

TDBFP not working AND

TDBFP Speed > 30 rpm AND

TDBFP Aux steam block vlv open AND

Aux steam press. > 12 ksc AND

Aux steam temp >280 degc ANDAux steam superheat > 50 degc AND

TDBFP suction / disch DT > 10 degc

8.3 TDBFP DISCHARGE VALVE

OPEN PERMISSIVE

1) TDBFP discharge IBV open

AUTO OPEN

1) SGC TDBFP turbine start-up step 34 cmd

2) TDBFP working AND Discharge press. > 40 ksc

3) TDBFP discharge IBV open and OPEN cmd from OWS

AUTO CLOSE


2) SGC TDBFP turbine shutdown step 55 cmd

3) TDBFP Tripped

4) TDBFP not working ANDDischarge header press > 60 ksc


50/89



TDBFP WORKING

1) TDBFP ESV open AND

Speed > 800 rpm AND

Remote engagement oil press > 3.5 ksc AND

[ Main CV >=2 % open OR CRH/Aux CV >=2 % open ]

8.4 TDBFP RECIRCULATION VALVE

CLOSE PERMISSIVE

1) TDBFP suction flow >550 tph AND

FW suction / disch. DT < 10 degc AND

No auto open command

2) TDBFP not working AND No auto open command

AUTO OPEN

1) TDBFP Working. AND

[ Suction flow < 400 tph OR FW suc./disch. DT > 10 degc OR

Suction flow measurement fault ]


4) SGC TDBFP turbine shutdown step 55 cmd

PROTECTION OPEN

1) TDBFP suction flow < 250 tph

2) TDBFP not working

AUTO CLOSE

1) TDBFP suction flow > 850 tph AND

FW suc./disch. DT < 10 degc TD- 5 sec

2) SGC TDBFP turbine start-up step-39 cmd3) TDBFP var set point: CLOSE TD- 5 sec

TDBFP variable set point: CLOSE

1) Diff between Calc Flow and suction flow > 50 t/hr

2) TDBFP FW suc flow >=550 t/hr

3) TDBFP speed meas NO fault

4) TDBFP suc & disch temp not HI 10 deg C


51/89



8.5 TDBFP REMOTE ENGAGEMENT SOLENOID V/V

OPEN / ENERGISE PERMISSIVE

1) TDBFP remote engagement oil pressure < 3.5 ksc AND

TDBFP journal brg temp < 90 degc AND

TDBFP thrust brg temp < 100 degc AND

TDBFP BP journal brg temp < 90 degc AND

TDBFP BP thrust brg temp < 100 degc AND

TDBFP turbine brg temp < 105 degc AND

TDBFP gearbox brg temp < 105 degc AND

Discharge vlv closed AND

Recirculation vlv open AND

Lub oil temp after cooler < 45 degc AND

Control oil header press. > 6.5 ksc AND

Lub oil press. > 1.5 ksc AND

Condenser press. < -0.5 ksc AND

TDBFP Casing top/ btm DT < 20 degc AND

TDBFP Suction / Disch. DT < 10 degc AND

Deaerator level adequate AND

TDBFP SUC valve open

AUTO OPEN / ENERGISE1) SGC TDBFP turbine start-up step 23 cmd

AUTO CLOSE / DEENERGISE

1) TDBFP remote engagement oil pressure > 3.5 ksc


8.6 TDBFP OIL VAPOUR EXTRACTOR FAN- A & B

AUTO START

2) Other OVE tripped

3) Other OVE off AND SGC TDBFP oil supply start-up step-1 cmd

AUTO STOP

1) SGC TDBFP oil supply shutdown step-58 cmd.


52/89



8.7 TDBFP LUB OIL PUMP - A & B

AUTO START

1) Other LOP tripped

2) Other LOP start cmd given AND pump not ON TD2s

3) [ TDBFP working OR Other LOP ON ] AND

[ Lub oil disch. hdr. press. < 1.5 ksc OR LOP disch. press. < 7

ksc ]

4) Other LOP off AND SGC TDBFP oil supply start-up stp-2

cmd

RELEASE STOP

1) TDBFP not working

2) TDBFP speed zero and TDBFP speed 1.5 ksc AND

LOP disch. press. > 7 ksc

AUTO STOP

1) SGC TDBFP oil supply shutdown step-57 cmd

8.8 TDBFP EMERGENCY OIL PUMP

AUTO START

1) EOP Auto on selected AND

TDBFP lub oil hdr. press. very low

RELEASE STOP

1) [ EOP Auto on not selected OR TDBFP lub oil hdr. press. not

very low ] AND[ Any LOP on OR TDBFP speed zero ]

AUTO STOP

1) SGC TDBFP oil supply shutdown Step-57 cmd


53/89



8.9 TDBFP JACK OIL PUMP

AUTO START

1) TDBFP Turbine speed < 510 rpm

2) SGC TDBFP oil supply start-up step-7 cmd


STOP PERMISSIVE

1) Speed zero and TDBFP speed 540 rpm

AUTO STOP



3) TDBFP Turbine speed > 540 rpm

8.10 TDBFP TURNING GEAR VALVE

AUTO OPEN

1) [TDBFP turbine Speed < 510 rpm

SGC TDBFP oil supply start-up step-6 cmd

SGC TDBFP oil supply shutdown step-52 cmd] AND2) LO to turning gear valve closed OR Speed 540 rpm

2) TDBFP turbine Casing temp < 85 degc

AUTO CLOSE:

1) TDBFP turbine Speed > 540 rpm2) SGC TDBFP oil supply start-up step-9 cmd


4) LO to turning gear valve Open AND Speed >=200 rpm

8.11 TDBFP ENGAGE SOLENOID VALVE

RELEASE OPEN / ENERGISE

1) TDBFP Speed zero AND Speed < 10 rpm AND

TDBFP Engage / diseng oil pump on


54/89



AUTO OPEN / ENERGISE


RELEASE CLOSE / DEENERGISE

1) TDBFP Speed zero AND Speed < 10 rpm AND

TDBFP Engage / diseng oil pump on

AUTO CLOSE / DEENERGISE


8.12 TDBFP DISENGAGE SOLENOID VALVE

RELEASE OPEN

1) TDBFP turb. Speed < 300 rpm AND

TDBFP engage / diseng oil pump ON

8.13 TDBPF ENGAGE / DISENGAGE OIL PUMP

START PERMISSIVE

1) TDBFP LOP discharge hdr. press. not low >1.5 kg

AUTO START:1) SGC TDBFP oil supply start-up step-5 cmd

AUTO STOP :

1) TDBFP pump engaged OR disengaged TD5s


55/89



9. MDBFP

START PERMISSIVES

[ AOP ON AND Lub oil press. > 2 ksc 2/3 ] TD2s AND

MDBFP Suction valve open AND

D/A level not low (> +20 mm) 2/3 AND

Working oil temp. upstream clrs < 110 degc 2/3 AND

Working oil temp. down stream clrs < 75 degc AND

HC lub oil temp down stream clrs < 55 degc 2/3 AND

MDBFP casing top / bottom DT < 22 degc AND

MDBFP journal bearing temp < 90 degc AND

MDBFP thrust bearing temp < 100 degc AND

Hydraulic coupling bearing temp < 90 degc AND

MDBFP motor journal bearing temp < 85 degc AND

MDBFP motor winding temp < 125 degc AND

Booster pump journal bearing temp < 90 degc AND

Booster pump thrust bearing temp < 100 degc AND

MDBFP CW header press. > 3.5 ksc AND

MDBFP HC tank level not low AND

MDBFP Recirculation Valve open AND

MDBFP CW Valve close AND[ [MDBFP discharge v/v AND IBV Close] OR MDBFP Standby

Selected ] AND

[ [MDBFP Rapid Start Up Solenoid SOV92 AND SOV93 ON

AND

Scoop position min. (0%) ] OR Hyd. coupling min/cls (50 tph)

2) MDBFP suction flow low ( < 100 tph) TD30s

3) HC lub oil header press. very low (< 0.8 ksc) 2/3

4) HC working oil temp very high (>130 degc) 2/3

5) HC working oil press very low (


56/89



7) MDBFP suction & discharge DT >15 degc 2/3

8) Lub oil temp. downstream clr very high (> 60 degc) 2/3

9) MDBFP journal bearing temp very high (> 95 degc)

10) MDBFP thrust bearing temp. very high ( >105 degc)

11) MDBFP motor winding temp very high ( >130 degc)

12) D/A level very low (< -1610 mm) 2/3

13) MDBFP motor journal bearing temp very high (> 90 degc)

14) Hyd. coupling bearing temp very high (> 95 degc)

15) Booster pump thrust bearing temp very high (> 105 degc)

16) Booster pump journal bearing temp very high (> 95degc)

17) EPB acted

MDBFP AUTO START

1) [ MD BFP in Standby AND

[ TD BFP-A tripped OR TD BFP-B tripped ] ]

2) Command from MDBFP Startup Sequence Step # 07

MDBFP AUTO STOP

1) Command from MDBFP Shutdown Sequence step # 51

9.1 MDBFP AOP

AOP AUTO START

1) MDBFP Auto Start

2) MDBFP ON AND Lub oil press. low ( 15ksc) AND BFP OFF

5) MDBFP OFF AND MDBFP Reverse Rotation Acted

6) Command from Startup Sequence Step # 06

7) MDBFP OFF AND 30 minutes hasn't elapsed to BFP OFF

status.

*Auto start command of A.O.P will persist for 30.min.

AOP AUTO STOP

1) MDBFP ON AND LO press. high (> 2.5 ksc) 2/3 TD2s

2) Command from Startup sequence step # 13- A

3) Command from Shutdown sequence step # 54- A

4) MDBFP OFF for 30 min AND Any bearing temp. not high


57/89



9.2 MDBFP RECIRCULATION VALVE

AUTO OPEN

1) MDBFP flow measurement fault

2) MDBFP ON AND

Suction flow < 400 tph AND

Its Variable Set point Fault

3) MDBFP ON AND

Its Variable Set Point no fault AND

Diff of MDBFP Suction flow and Corrected Spd less than 5 tph

4) MDBFP ON AND Discharge / Suction DT >10 degc

5) Command from Startup sequence step # 02- A

6) Command from Shutdown sequence step # 52- B

PROTECTION OPEN

1) MDBFP Suction flow low ( 50 tph ] ORMDBFP Suction flow > 850 tph ] AND

MDBFP Disch / Suction DT 50 tph ] OR

MDBFP Suction flow more (>850 tph) ] AND

MDBFP Disch /Suction DT 40 ksc TD2s


3) Any TDBFP ON AND MDBFP Standby Selected AND

Disch. header press. > 60 ksc


58/89



OPEN RELEASE

1) Discharge Valve I.B.V Opened AND Reverse Rotation Not

Acted

AUTO CLOSE

1) MDBFP OFF AND in Stdby AND MDBFP Reverse rotation

acted

2) MDBFP OFF AND in Stdby AND MDBFP Suction press. > 15

ksc

3) MDBFP OFF

4) Command from Sequence Startup Step # 06-A

5) Command from Sequence Shutdown Step # 53-A

6) MDBFP OFF AND in standby AND Discharge press. < 40 ksc

TD2m

CLOSE RELEASE

1) MDBFP OFF

9.4 MDBFP DISCHARGE IBV

AUTO OPEN1) MDBFP ON AND MDBFP Disch header. press. > 40 ksc TD1s

2) Command from Startup Sequence Step # 15- A

3) MDBFP Selected standby AND

Any TDBFP ON AND Discharge header press. > 60 ksc TD2s

AUTO CLOSE

1) Command from Startup Sequence Step # 06- B


3) MD BFP Discharge valve opened

4) Command from Shutdown Sequence Step # 53- B

9.5 MDBFP RAPID START-UP SOLENOID - 91/92

AUTO OPEN

1) MD BFP Auto Start



59/89



AUTO CLOSE

1) MD BFP ON for 5.sec

2) MD BFP Reverse Rotation Acted


2) MD BFP STDBY SELECTED & MD BFP Reverse Rotation Acted

3) MD BFP STDBY SELECTED & SUC PR >15 KG

OPEN RELEASE

1) MD BFP standby selected AND Its Reverse Rotation Not Acted

9.6 MDBFP CW VALVE

AUTO OPEN

1) MD BFP ON


CLOSE RELEASE

1) MD BFP OFF

AUTO CLOSE

1) MD BFP Selected standby AND

Discharge header press. > 60 ksc TD2s ANDAny TDBFP ON

2) Command from Startup Sequence Step # 01-A

3) Command from Shutdown Sequence Step # 53- C

4) MD BFP OFF


60/89



10 CEP

START PERMISSIVE

CEP Suction valve open AND

Hotwell level not low (>-250 mm) 2/3 AND

Swgr. available AND

Thrust bearing temp < 100 degc AND

Motor bearing temp. < 85 degc AND

Motor winding temp. < 125 degc AND

Recirculation valve 40% open AND

Vent valve open AND

[[CEP Standby selected AND Its disch v/v open ] OR

CEP discharge valve closed ]

TRIP PROTECTION

1) Hotwell Level very low ( < - 1850 mm ) 2/3

2) CEP ON AND Discharge press. low ( < 18 ksc )

3) CEP ON for 10 sec AND Flow through CEP low ( < 300 tph)

TD5s

4) Thrust bearing temp. very high ( > 105 degc)5) Motor bearing temp. very high ( > 90 degc)

6) Motor winding temp. very high ( > 130 degc)

7) Suction valve not open

AUTO START

1) Pump Selection Standby AND

Other Running pump Tripped

2) Pump Selection Standby ANDAny other pump ON for 30 sec AND

Discharge header press. low (


61/89



10.1 CEP DISCHARGE VALVE

AUTO OPEN

1) CEP ON AND Discharge press. > 18 ksc TD2s

2) CEP Discharge press. > 18 ksc AND

Any other CEP ON AND CEP Standby Selected TD5s

3) Command from CEP Startup sequence step # 106

OPEN RELEASE

1) Discharge Valve I.B.V Open

CLOSE RELEASE

1) CEP OFF

AUTO CLOSE

1) CEP Stdby Selected AND Disch hdr. press. < 20 ksc TD2m

2) CEP OFF


4) Command from CEP Shutdown sequence step # 202

DISCHARGE VALVE I.B.V AUTO OPEN

1) CEP ON AND Discharge press. > 18 ksc TD2s

2) CEP discharge press. > 18 ksc AND


DISCHARGE VALVE I.B.V AUTO CLOSE

1) Discharge valve opened

10.2 CEP VENT VALVE

AUTO OPEN

1) CEP discharge press. > 18 ksc AND


2) CEP OFF


4) Command from CEP Shutdown sequence step # 202

AUTO CLOSE

1) CEP ON

OPEN RELEASE

1) CEP OFF


62/89



11. ACW PUMP

START PERMISSIVES

1) Suction header press. > 1 ksc 2/3 AND

Suction valve open AND

[ Pump Selected Stdby AND Dischg vlv open ] OR Discg vlv clsd

TRIP PROTECTIONS

1) Pump ON for 08 sec AND Discharge press. high (>4.5 ksc )

2) Pump ON for 120sec AND Discharge valve not open

3) Pump ON and Suction Valve Not Open TD- 30 sec

4) Pump ON AND Any other ACW ON ANDCommon discharge hdr. press. > 4.5 ksc 2/3 TD30s

5) Suction header press. < 0.2 ksc 2/3 TD5s

AUTO START

1) Pump Selected Standby AND Any other ACW tripped

2) P/p Selected Stdby AND Any other p/p ON AND Dischg hdr. pr

< 2.3 ksc

3) Command from ACW Startup Sequence Step # 3-A

11.1 ACW PUMP DISCHARGE VALVE

AUTO OPEN

1) Pump Stdby Selected AND any other ACW ON AND Discharge

header press. > 2.3 ksc AND ACW-A OFF

2) Pump ON AND Discharge press. > 2.3 ksc


AUTO CLOSE

1) Pump Selected stdby AND Disch hdr pr < 2.3 ksc AND ACW

OFF TD10s

2) ACW OFF


4) Command from ACW Shutdown Sequence Step # 52-A

PERMISSIVE TO CLOSE

1) ACW-A OFF


63/89



11.2 ACW PUMP SUCTION VALVE

AUTO OPEN

1) Pump Stdby Selected.


AUTO CLOSE

1) Command from ACW Shutdown Sequence Step # 52-A.

2) ACW-A OFF

PERMISSIVE TO CLOSE

1) ACW-A OFF


64/89



12. ECW PUMP

START PERMISSIVE

1) Motor winding temp. < 125 degc AND

Motor bearing temp. < 85 degc AND

ECW standby condition & Discharge valve open AND

Discharge valve Closed AND

Suction header press > 2.5 ksc 2/3 AND

Any ECW p/p ON OROverhead tank level not low ( > 950 mm)

ECW STANDBY CONDITION

1) Discharge v/v closed2) ECW standby selected AND Discharge v/v open

3) Motor winding temp. < 125 degc AND

4) Motor bearing temp. < 85 degc AND

5) Overhead tank level not low ( > 950 mm)

TRIP PROTECTIONS

1) ECW ON for 60sec AND Discharge valve not open

2) Suction valve not open

3) ECW ON AND Discharge hdr. press. very high (> 8.5 ksc)

4) Suction header press. very low (< 0.2 ksc) 2/3

5) Motor winding temp very high (> 130 degc)

6) Motor bearing temp very high (> 90 degc)

AUTO START

1) Pump Selection Standby AND Any other pump Tripped2) Pump Selection Standby AND Any other pump ON AND

Discharge hdr. pr. low


AUTO STOP

1) Command from Shutdown Sequence Step # 51


65/89



12.1 ECW PUMP DISCHARGE VALVE

AUTO OPEN

1) Pump Standby Selected AND Its Start Permissive Available

AND

Any other pump ON AND Discharge header press. > 3 ksc

2) Pump ON AND Its Discharge press. > 5.4 ksc

3) Command from Start Up Sequence step # 04 - A

AUTO CLOSE

1) Pump Selected standby AND Discharge header press. < 3 ksc

2) Pump OFF



12.2 ECW O/H TANK MAKE UP VALVES (SG + TG)

EMG MU VALVE AUTO OPEN

1) ECW O/H Tank Level low (


66/89



13 LP BYPASS

1) LP Bypass Reset Trip SOV Protection valve will act

at condenser wall temp > 90 C

2) Injection water v/v open command will be issued at

steam pressure before bypass v/v 1/2 > 6.8 ksc

Closure of LPBP , in vase of:

a) Condenser vacuum is low

b) Spray water pressure is low

c) Temperature of condenser body is high

Malfunctions of the turbine bypass, i.e. failure of the bypass valves to

open on demand, have to be counteracted by opening of the reheat

safety valves to ensure flow through the reheater. This prevents a heat

accumulation in the reheater tubes. For this purpose, the measure of

flow through reheater is the magnitude of the deviation between actual

and set pressure. The following conditions prevail.

1. If the control deviation rises above a set limit value (>30%) and

neither all bypass stop valves are fully open (25 %)

and all LP bypass stop valves are fully open, the command for opening

the reheater safety valves is also given on a time delay of 30 Seconds.

13.1 SEAL STEAM

1) Turbine Seal Steam Supply valve will get auto closed

on temperature interlock at

Seal Steam Header temp < 190 C

2) Gland steam press abnormal : > 450 mmwc OR

< 50 mmwc


67/89



14. AUX PRDS

14.1 HT PRDS INLET ISOLATING VALVE ASV 21

OPEN PERMISSIVE

1) HT PRDS Isolating vlv ASV 21 IBV open

AUTO OPEN

1) HT PR control valve ASV 22 > 2 % open


AUTO CLOSE

1) HT PR control valve ASV 22 < 2 % open TD-1.5 sec

PROTECTION CLOSE

1) HT PRDS Temperature V High > 350 degc

2) LT PRDS Temperature V High > 285 degc

14.2 HT PRDS ISOL. VALVE ASV 21 IBV

AUTO OPEN


2) HT PR control valve ASV 22 > 2 % open

AUTO CLOSE

1) HT PRDS Isolating vlv ASV 21 open

2) HT PR control valve ASV 22 < 2 % open

PROTECTION CLOSE



14.3 HT PR CONTROL VLV ASV 22

PROTECTION CLOSE

1) MFT operated



4) CRH press > 18 ksc AND ASV 22


68/89



14.4 LT PRDS INLET ISOLATING VLV ASV 25

AUTO OPEN

1) LT PR control valve ASV 26 > 2% open

AUTO CLOSE

1) LT PR control valve ASV 26 285 degc

14.5 LT PRDS CV BYP VLV ASV 28

CLOSE PERMISSIVE

1) LT PR CV bypass valve ASV 29 close

PROTECTION CLOSE



14.6 LT PR CONTROL VLV ASV 26

AUTO CLOSE

1) CRH press < 18 ksc

PROTECTION CLOSE

1) MFT operated



14.7 LT PRDS DESH. VALVE ASV 181

AUTO OPEN

1) HT PR control valve ASV 22 > 2% open


AUTO CLOSE

1) HT PR control valve ASV 22 < 2% open AND

LT PR control valve ASV 26 < 2% open


69/89



14.8 SPRAY BLOCK VALVE to PRDS FDV 43

AUTO OPEN

1) HT PR control valve ASV 22 > 2% open


RELEASE CLOSE

1) HT PR control valve ASV 22 < 2% open AND

LT PR control valve ASV 26 < 2% open

AUTO CLOSE

1) HT PR control valve ASV 22 < 2% CLOSE

2) LT PR control valve ASV 26 < 2% CLOSE

3) LT PR control valve ASV 29 < 2% CLOSE

PROTECTION CLOSE

1) MFT operated

14.9 HT PRDS SPRAY ISOLATING VLV FDV 29

AUTO OPEN

1) [HT PR control valve ASV 22 > 2% open OR

HT APRDS spray control vlv FDV 30 >2 % open] AND

2) Main line selected

AUTO CLOSE

1) HT PR control valve ASV 22


70/89



FORCED AUTO

1) HT PR control valve ASV 22 > 2 % open AND


14.11 HT PRDS SPRAY CONTROL VALVE FDV 31

AUTO CLOSE

1) HT PR control valve ASV 22 < 2% close

PROTECTION CLOSE

1) MFT operated

FORCED AUTO

1) HT PR control valve ASV 22 > 2 % open AND


14.12 LT PRDS SPRAY ISOLATING VLV FDV 33

AUTO OPEN

1) [LT PR control valve ASV 26 > 2% open OR

HT PR control valve ASV 22 > 2% open] and


RELEASE CLOSE

1) LT PR control valve ASV 26 < 2% open AND

HT PR control valve ASV 22


71/89



AUTO OPEN

1) [LT PR control valve ASV 26 > 2% open OR

HT PR control valve ASV 22 > 2% open] and

2) Bypass line selected

RELEASE CLOSE

1) LT PR control valve ASV 26 < 2% open AND

HT PR control valve ASV 22 2% open] AND


14.15 LT PRDS SPRAY CONTROL VALVE FDV 46

AUTO CLOSE

1) HT PR control valve ASV 22 < 2% close ANDLT PR control valve ASV 26 < 2% close AND

ASV 29 < 2% open

PROTECTION CLOSE

1) MFT operated

FORCED AUTO

1) [HT PR control valve ASV 22 > 2 % open OR

LT PR control valve ASV 26 > 2% open] AND



72/89



15 LP HEATERS

15.1 LPH CONDENSATE INLET ISO. VALVE

OPEN RELEASE

1) LPH Cond. I/L Isolating valve I.B.V Open ANDLPH Level Not HI

AUTO OPEN


CLOSE RELEASE

1) LPH Bypass Valve Opened

AUTO CLOSE

1) Command from Shutdown Sequence Step # 52- A

PROTECTION CLOSE

1) LPH Bypass Valve Not ClosedAND

LPH Level very high 2/3

15.2 LPH CONDENSATE OUTLET ISO. VALVE

OPEN RELEASE

1) LPH Level Not HI

AUTO OPEN


CLOSE RELEASE

1) LPH Bypass Valve Open

AUTO CLOSE

1) Command from Shutdown Sequence Step # 52- B

PROTECTION CLOSE

1) LPH Bypass Valve Not Closed AND LPH Level very high 2/3


73/89



15.3 LPH CONDENSATE INLET ISO. IBV

OPEN RELEASE

1) LPH Level Not HI

AUTO OPEN


AUTO CLOSE


2) Command from Shutdown Sequence Step # 52-D

3) LPH Cond. I/L Isolating valve open

PROTECTION CLOSE

1) LPH Level very high 2/3

15.4 LPH BYPASS VALVE

AUTO OPEN

1) Command from Shutdown Sequence Step # 51-A

CLOSE RELEASE

1) LPH Cond. I/L AND O/L Isolating valve Open

AUTO CLOSE

1) LPH Cond. I/L AND O/L Isolating valve Open


PROTECTION OPEN



74/89



15.5 LPH 2 & 3 EXT STM VALVES

EXT STM ISOLATING VALVE OPEN RELEASE

1) LPH I/L Isolating valve open AND

O/L Isolating valve open AND

LPH level not high AND Turbine Not Tripped

EXT STM ISOLATING VALVE AUTO OPEN

1) Command from Start Sequence Step # 04- A

EXT STM ISOLATING VALVE AUTO CLOSE

1) Command from Shutdown Sequence Step # 52- A

EXT STM ISOLATING VALVE PROTECTION CLOSE

1) Turbine Tripped


3) LPH Cond. I/L Isolating valve Not Open

4) LPH Cond. O/L Isolating valve Not Open

5) LPH Cond. Bypass Valve Not Close

EXT STM DRN VALVE AUTO OPEN


2) Command from Shutdown Sequence Step # 51- A3) LPH EXT STM Isolating valve close

EXT STM DRN VALVE AUTO CLOSE


2) LPH EXT STM Isolating valve open

EXT STM DRN VALVE PROTECTION OPEN


2) Turbine Tripped


75/89



16. HP HEATERS

16.1 HPH 5A FW INLET ISOLATING VALVE

OPEN RELEASE

1) HPH-5A FW I/L isolating valve I.B.V opened AND

2) HPH-5A/6A level < 135 mm 2/3 (Not Hi)

AUTO OPEN


CLOSE RELEASE

1) [HPH FW 50% BYP Valve Opened AND

HPH-5B FW I/L Iso. Valve Opened ANDHPH-6B FW O/L isolating valve opened] OR

2) HPH FW 100% bypass valve opened

AUTO CLOSE

1) Command from Shutdown Sequence Step # 62-C

PROTECTION CLOSE

1) Release to Auto Close available AND

HPH-5A/6A Level > 415 mm 2/3 (HI HI)

16.2 HPH 5A FW INLET ISOLATING IBV

AUTO OPEN


2) HPH -5A iso valve open CMD

PERMISSIVE OPEN

1) HPH -5A/6A level not high

AUTO CLOSE

1) Command from Startup Sequence Step # 62-E

2) HPH-5A FW I/L isolating valve open

3) HPH-5A FW I/L isolating valve Close CMD

PROTECTION CLOSE

1) HPH-5A/6A Level > 415 mm 2/3 (Hi Hi)


76/89



16.3 HPH 6A FW OUTLET ISOLATING VALVE

OPEN RELEASE

1) HPH-6A FW O/L isolating valve I.B.V opened AND

HPH-5A/6A level < 135 mm 2/3

AUTO OPEN


CLOSE RELEASE

1) HPH FW 50% BYP Valve Opened AND

HPH-5B FW I/L Iso. Valve Opened AND

HPH-6B FW O/L Iso. Valve Opened OR

HPH FW 100% bypass Valve Opened

AUTO CLOSE

1) Command from Shutdown Sequence Step # 62 -D

PROTECTION CLOSE

1) Release to Auto Cls Available AND HPH-5A/6A Level > 415 mm

2/3

16.4 HPH 6A FW OUTLET ISOLATING IBV

AUTO OPEN

1) Command from Startup Sequence Step # 01-B

2) HPH -6A O/L iso valve open CMD

PERMISSIVE OPEN

1) HPH -5A/6A level not high

AUTO CLOSE1) Command from Startup Sequence step# 04-B

2) HPH-5A FW I/L isolating valve open

3) HPH-5A FW I/L isolating valve Close CMD Step # 62-F

PROTECTION CLOSE

1) HPH-5A/6A Level > 415 mm 2/3


77/89



16.5 HPH 5A(6A) EXT. STM VALVE AND NRV

OPEN PERMISSIVE

1) HPH-5A/6A LVL NOT HI

2) HPH-5A I/L isolating Valve Open AND

HPH-6A O/L isolating Valve Open

3) Turbine Not Tripped

4) [ HPH-5B FW I/L Iso. valve Closed AND

HPH-6B FW O/L Iso. valve Closed AND

HPH FW 50% BYP Valve Opened AND

HPH FW 100% bypass Valve Closed ] OR

[ HPH FW 100% bypass valve closed AND

HPH-5B FW I/L Iso. valve Opened AND

HPH-6B FW O/L Iso. valve Opened ANDHPH FW 50% bypass valve Closed ]

AUTO OPEN


AUTO CLOSE

1) Command from Shut down Sequence Step # 51- A

PROTECTION CLOSE

1) Turbine Not Tripped

2) HPH-5A FW I/L isolating valve Closed

3) HPH-6A FW O/L isolating valve Closed

4) HPH FW 100% BYP valve open

5) HPH-5A/6A level very high

HPH-5A EXT STM I/L NRV AUTO OPEN


HPH-5A EXT STM I/L NRV AUTO CLOSE


HPH-5A EXT STM I/L NRV PROTECTION CLOSE

1) Turbine Tripped

2) HPH-5A FW I/L isolating valve not opened

3) HPH-6A FW O/L isolating valve not opened

4) HPH FW 100% bypass valve not closed

5) HPH-5A/6A Level very high


78/89



HPH-5A/5B EXT STM DRN VALVE AUTO OPEN

1) Command from HPH-5A/6A Shutdown Seq Step # 202

2) Command from HPH-5B/6B Start-up Seq Step # 102

3) Command from HPH-5B/6B Shutdown Seq Step # 202

4) HPH-5A EXT STM Valve Closed AND

HPH-5B EXT STM Valve Closed

HPH-5A/5B EXT STM DRN VALVE AUTO CLOSE

1) Command from HPH-5A/6A Startup Seq Step # 112

2) Command from HPH-5B/6B Startup Seq Step # 112

3) HPH-5A EXT STM Valve opened

4) HPH-5B EXT STM Valve opened

HPH-5A/5B EXT STM DRN V/V PROTECTION OPEN


2) HPH-5B/6B Level very high

HPH-6A EXT STM DRN VALVE AUTO OPEN

1) Command from HPH-5A/6A Shutdown Seq Step # 201


3) HPH-6A EXT STM Valve

HPH-6A EXT STM DRN VALVE AUTO CLOSE


2) HPH-6A EXT STM Valve opened

HPH-6A EXT STM DRN V/V PROTECTION OPEN


16.6 HPH FW 50% BYPASS VALVE

OPEN RELEASE

1) HPH FW 50% BYP Valve I.B.V Open

AUTO OPEN

1) Command from HPH Startup Seq Step # 107

2) Command from HPH Shutdown Seq Step # 204

AUTO CLOSE

1) Command from HPH Startup Seq Step # 5- A

2) Command from HPH Shutdown Seq Step # 06- A


79/89



PROTECTION OPEN

1) HPH-5A/6A Level > 415 mm 2/3

2) HPH-5B/6B Level > 415 mm 2/3

CLOSE PERMISSIVE

1) [ HPH-5A I/L Iso. Valve Opened AND

HPH-6A O/L Iso. Valve Opened AND

HPH-5B I/L Iso. Valve Opened AND

HPH-6B O/L Iso. Valve Opened ] OR [ HPH FW 100% bypass

Valve Opened ]

BYP.VALVE I.B.V AUTO OPEN


2) Command from HPH Shutdown Seq Step # 54- A

BYP.VALVE I.B.V AUTO CLOSE

1) Command from HPH Startup Sequence Step # 08-B

2) Command from HPH Shutdown Sequence Step # 05- B

3) HPH FW 50% bypass Valve opened

4) Command from HPH Shutdown Sequence Step # 60-B

BYP.VALVE I.B.V PROTECTION OPEN

1) HPH-5A/6A Level > 415 mm

2) HPH-5B/6B Level > 415 mm

16.7 HPH FW 100% BYPASS VALVE

CLOSE PERMISSIVE

1) [ HPH-5A I/L Iso. Valve Opened AND

HPH-6A O/L Iso. Valve Opened AND

HPH-5B I/L Iso. Valve Opened AND

HPH-6B outlet Iso. Valve Opened ] OR

[ HPH-5A FW I/L Iso.Valve Opened AND

HPH-6A FW O/L Iso.Valve Opened OR

HPH-5B FW I/L Iso. Valve Opened AND

HPH-6B FW O/L Iso. Valve Opened AND

HPH FW 50% bypass Valve Opened ]

OPEN RELEASE

1) HPH FW 100% BYP Valve I.B.V Open


80/89



AUTO OPEN

1) Command from HPH Shut down Seq Step # 58- A

AUTO CLOSE


PROTECTION OPEN

1) [ HPH-5A FW I/L Iso. Valve Not Open OR

HPH-6A FW O/L Iso. Valve Not Open OR

HPH-5A/6A Level > 415 mm ] AND

[ HPH-5B FW I/L Iso. Valve Not Open OR

HPH-6B FW O/L Iso. Valve Not Open OR

HPH-5B/6B Level > 415 mm ]

BYP.VALVE I.B.V AUTO OPEN

1) Command from HPH Shut down Seq Step # 57- A

BYP.VALVE I.B.V AUTO CLOSE

1) Command from HPH Startup Sequence Step # 09-A

2) Command from HPH Shutdown Sequence Step # 59- A

3) HPH FW 100% bypass Valve opened

BYP.VALVE I.B.V PROTECTION OPEN

1) [ HPH-5A FW I/L Iso. Valve Not Open OR

HPH-6A FW O/L Iso. Valve Not Open OR

HPH-5A/6A Level > 415 mm ] AND

[ HPH-5B FW I/L Iso. Valve Not Open OR

HPH-6B FW O/L Iso. Valve Not Open OR

HPH-5B/6B Level > 415 mm ]


81/89



17. DEAERATOR

1 AS TO D/A PEGGING CV BP VALVEASV 10

PROTECTION CLOSE:

1) Deaerator level very high

2 D/A OVERFLOW CONTROL VALVE DRV 48

AUTO OPEN

1) Deaerator level high

PROTECTION OPEN


AUTO CLOSE

1) Deaerator level low

3 CRH TO D/A PEGGING CV BP VALVE CRHV 8

PROTECTION CLOSE:


4 D/A EXTRACTION VALVE EXV 13

OPEN PERMISSIVE

1) D/A level not High.

AUTO OPEN

1) Extraction steam pressure >3.5 ksc

PROTECTION CLOSE1) D/A level V High

2) Turbine tripped


82/89



5 D/A EXTRACTION LINE DRAIN VALVE EXV 15

AUTO OPEN

1) Turbine tripped

AUTO CLOSE

1) Extraction steam flow to D/A >10%

6 Main Cond CS CV ( CD-22) I/L iso valve

Auto open: CD-22 is opened by >2%

AutoClose: CD-22 is closed by 2%

AutoClose: CD-25 is closed by


83/89



18. CW PUMP

1 CW PUMP START PERMISSIVES

Sump level not low (>34.7 m) AND

Motor thrust bearing temp < 100 degc AND

Motor upper guide bearing temp NDE < 100 degc AND

Motor lower g

Protection and Interlock-NTPC

Documents

Transcript of Protection and Interlock-NTPC