Protection And Interlock-ntpc 5g6da

KAHALGAON STAGE-II 3x500 MW INDEX SG Side 1. 2. 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Master fuel trip Unit purge logic Light oil valve Heavy oil valve Mills Raw Coal feeder ID fan FD fan PA fan BCW pumps Secondary pre heater Primary air heater HPBP Scanner fan Seal Air fan LDO HFO pump ERV TG Side Turbine Protection Turbine lub oil system Turbine HPCF System Evacuation system Turbine fire protection EHTC GENERATOR AUXLIARIES TDBFP MDBFP CEP ACW PUMP ECW PUMP LPBP GSPC AUX PRDS LP HEATERS HP HEATERS DEAERATOR CW PUMP CONDENSATE TRANSFER SYSTEM LEVEL SETTINGS

PAGE NO. 1 1 2 2 3 6 7 9 11 13 14 16 18 20 21 22 23 24 25 28 32 36 38 41 47 54 59 61 63 65 66 71 74 80 82 85 86

PROTECTIONS AND INTERLOCKS DIARY

1. MASTER FUEL TRIP 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19.

Both ID Fan OFF Both FD Fan OFF Water Wall Circulation Incorrect Both EPB-1,2 Pressed Furnace Pressure Very Low < -175 mm WC Furnace Pressure Very High > 150 mm WC Drum LVL V High TD 10 Sec > 250 mm above NWL Drum LVL V Low TD 5 Sec < -375 mm below NWL Air Flow < 30 % < 600 TPH Loss Of Reheater Protection ( TD 10 Sec) Unit 24 V DC Not Available Unit 220 V DC Not Available ( TD 2 Sec) Less Than FB & Loss of AC in any Elevation in service Unit Flame Failure Trip Loss Of All Fuel Trip All Secondary Air Heaters Off All Boiler Feed Pumps Tripped TD 10 Sec MFT network failure Soft EPB trip

2. UNIT PURGE LOGIC 1 2 3 4 5 6 7 8 9 10 11 12

MFT DPUs unfreezed No Boiler Trip Conditions In all the Three Channels Both PA Fans Off. HOTV Closed. All Elevations HONV Closed. LOTV Closed EL AB All LONV Closed. All Feeders Off. All Hot Air Gates Closed. All Elevations Show No Flame. All Auxiliary Air Dampers Modulating. Air Flow < 40% & > 30 %

KAHALGAON STAGE – II 3 X 500 MW

1


3. LIGHT OIL TRIP VALVE 3.1 OPENING PERMISSIVES:

1. 2. 3. 4. 5. 6.

Unit 24 V DC Power Available. No Close PB Command LO Supply Pressure OK > 15 Kg/cm2 EL AB All LONV Closed No Auto Closing Conditions Present. 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. 2. 3. 4. 5. 6. 7. 8. 9.

HO Supply Pressure Adequate > 21.2 Kg/cm2 & HO Supply Temperature Adequate > 110º C & No MFT & All Elevation HONV Closed & No Closing Command from APS or MMI & No Auto Closing Conditions Above Conditions Or condition below 8-9 & 24 V Power available HO Recirculation Valve Open & No Auto OR Manual close commands.

4.2 AUTO CLOSING CONDITIONS:

1. HO Hdr Temp V Low & Any HONV not closed <90º C Or 2. HO Hdr Press V Low & Any HONV not closed < 3.75 Kg/cm2 Or 3. Atom Stm Press V Low & Any HONV not closed < 2.5Kg/cm2 & No HO Start /Stop in any elevation Or 4. MFT Operated Or 5. Close Command from APS Logic or Manual Commands.


2


5. EQUIPMENT : MILLS 5.1 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 5.2 1. 2. 3. 4. 5. 6.

No Pulv Unsuccessful elevation start Bunker Outlet Gate open Feeder Inlet Gate open Mill Discharge Valve open Mill start permit from PLOS ( See Conditions Below) Mill Outlet temp not high < 90° C Cold Air Gate open Tramp Iron Hopper Valve open Mill/ Oil Elevation Start Permit No MILL Trip Primary Air Permit Yes All Burner Isolation Gates open MILL START PERMIT FROM PLOS:

Any Lub Oil Pump ON Sump / Lube Oil Temperature not high < 80 O C LOP discharge pressure not low > 3.5 Kg/cm2 Lube Oil Filter DP Not High < 1.5 Kg/cm2 Sump Oil Level Adequate (10mm below CL) Lube Oil Pressure Not Very Low > 3 Kg/cm2

5.3 1. 2. 3. 4.

MILL READY CONDITIONS :

MILL START PERMISSIVES:

MILL Ready Conditions As Above SA HDR/ Pulv Bowl DP Adequate > 350 mm WC MILL Motor Switchgear Available MILL Status Off & Igntion Permit Available


3


MILL PROTECTIONS : 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 5.4 1. 2. 3. 4.

Motor Winding Temp V high (TD 5 Sec) > 130 0 C Motor Brg Temp V high ( TD 5 Sec ) > 90 0 C Mill Brg Temp Very High ( TD 5 Sec ) > 90 0 C Mill Trip From PLOS Pulv H/W Trip from MCC Pulv on & SA HDR/Bowl DP low( TD 1 Min)< 200 mm WC MFT Acted Pulv. Ignition required & permit NA Pulv. command On and failed to start TD 10 Sec Pulv. discharge valve not open Any burner isolating gates not open Loss of primary air ( See Conditions Below) PA Trip.( TD J0,H2,G4,F6,E8 Sec) Loss of elevation +24 V power supply EPB pressed MILL TRIP FROM PLOS :

MILL On and LO Temp high (TD 60 Min)> 80 0 C MILL On & Both Lube Oil Pumps off ( TD 2 Sec) LO Pres V low & LOP In Service (TD 10 Sec)< 3 Ksc 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


4


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. 2. 3. 4. 5. 6.

5 Or More MILL On & any One Of the Following Any FD Fan Off Any PA Fan Off Loss of BFP - at least 2 BFPs - OFF Loss Of SAH - at least 1 SAH - OFF BCW pumping Not O.K - 2 P/Ps ON & DP <18 psi

5.9

PRIMARY AIR CONDITIONS (PERMISSIVE):

1. PA HDR Pressure very low > 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


5


6. RAW COAL FEEDER 6.1 START PERMISSIVES: 1. 2. 3. 4. 5. 6. 7. 8. 9.

Feeder Switch In Remote & MFT Not Acted & Mill Outlet Temp Not low > 55 0 C & Mill Status On & Feeder Seal Air Valve Open & Fdr Speed Min & Mill Ready & Feeder Outlet Gate Open & Mill Ignition Permit Available or mill ignition not required

6.2 PROTECTIONS: 1. 2. 3. 4. 5. 6. 7. 8.

Feeder Switch Not In Remote Or MFT Operated Or Mill Outlet Temp Low < 55 Deg C Or Mill Status Off Or Auto/Manual Stop Command Or Fdr Seal Air valve not open Or Fdr On > 5 sec & no coal on belt & Mill Motor current Not low Or Pulv Ignition Permit Not available and Ignition Required


6


7. ID FAN 7.1 START PERMISSIVES FOR VFD CH-1: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17.

VFD CH-1 No Fault VFD Source Breaker On No VFD alarm persisting VFD CH-1 Ready VFD Start Permissive available. VFD CH-2 On Or 7,8 Below Fan Control Damper Posn Min Fan Inlet & Outlet Gates Closed Fan Either Lube Oil Pumps On. Fan Lube Oil Pressure > 0.8 Kg/cm2 Fan Motor Temp Not high < 85 o C Fan Brg. Temp Not high < 90 o C Fan Motor & Exciter Winding Temp Not high < 125 o C Fan VFD Aux Supply OK FG Path Available or Other ID Fan On Lube Oil Temp Aft Cooler Not high < 50 o C 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


7


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


8


8.

FD FAN 8.0.1 START PERMISSIVES:

1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13.

Fan L O Pressure Adequate> 0.8 Kg/cm2 Fan Motor Winding Temp Not high < 125 o C Fan Brg Temp Not high < 90 o C Fan Motor Brg Temp Not high < 85 o C Fan Control Oil Pressure Adequate > 8 Kg/cm2 Fan Control Damper Position Minimum Fan Outlet Damper Closed Either LOP on FAN Switchgear Available Lub Oil tank level not MIN Fan Lube Oil Cooler O/L Temp. Not High < 50 o C Both ID Fans On & I/L, O/L gates OPEN Either ID Fan On & I/L, O/L gates OPEN & Other FD Fan Off

8.0.2 PROTECTIONS 1. 2. 3. 4. 5. 6. 7. 8.

Fan On & O/L Damper Closed (TD 30 Sec) Both FD Fans On & both ID fans ON & ID Fan-B OFF Both ID Fans OFF Post Purge Trip From FSSS Fan Brg Temp Very High ( TD 5 Sec)> 110 o C Motor Brg Temp Very High ( TD 5 Sec )> 90 o C Fan Motor Winding Temp V High( TD 5 Sec)> 130 o C Fan/ Motor Vibration V High TD 05 Sec)> 7.1 rms mm/s /19.8 p-p mm/s 9. EPB pressed


9


8.1

EQUIPMENT: FD FAN LOP

ON PERMISSIVE: 1. Lub oil tank level not low. 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)


10


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 1. 2. 3. 4. 5. 6. 7. 8. 9.

PROTECTIONS: MFT Operated Temperature V. Hi [ DE & NDE] >=110 deg C Brg temp V HI >=90 deg C Mtr Wdg temp V HI >=130 deg C MTR Brg Vibration V HI [RMS] >=7.1 rms mm/sec TD-05 SEC FAN Brg Vibration V HI[Peak] >=19.8 0-p mm/sec TD-05 SEC Both FD Fans Off PA Fan-B On & O/L Damper Closed TD 35 SEC EPB pressed


11


9.1

PA FAN LOP

ON PERMISSIVE: 1. Lub oil tank level not low. 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)


12


10

EQUIPMENT: BOILER CIRCULATING PUMP 10.1 START PERMISSIVE: 1. 2. 3. 4. 5. 6. 7. 8. 9.

BCW PUMP-C Disch. Valve-1 OPEN BCW PUMP-C Disch. Valve-2 OPEN BCW PUMP-C Cooling water flow Not low >=32 gpm BCW PUMP-C motor cavity Temp. O.K >2o C & <57 oC BCW PUMP-C Diff. Temp. B/W Suc. MF & CG Not HI < 38 oC DRM N2 Filling Isolation Valve Left(B003) Closed DRM N2 Filling Isolation Valve Left(B004) Closed DRM N2 Filling Isolation Valve Right(B20) Closed DRM N2 Filling Isolation Valve Right(B21) Closed 10.2 PROTECTIONS:

1. P/P Motor Cavity Temp Very High 2. Discharge V/V Stem-1 Not Open 3. Discharge V/V Stem-2 Not Open

> 60ºC TD 5 Sec

10.3 BCW CW BOOSTER P/P AUTO START CONDITIONS: 1. 2. 3. 4.

Running Other Pump Tripped. Or Other P/P On & Discharge Pressure Low< 3.5 Kg/cm2 MCC Disturbance Not Present 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


13


11

EQUIPMENT : SECONDARY AIR HEATER. START PERMISSIVES : Electrical Motor 1. Guide Bearing oil temp Not high 2. Bearing oil temp Not high

< 70 o C < 70 o C

START PERMISSIVES : Air Motor 1. Thrust Brg Temp Not high 2. Guide Brg Temp Not high 3. Electrical motor OFF

< 70 o C < 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. 13.4 Air Motor running status from pr switch (setting 3.0 kg↓) 13.5 Fire sensing alarm (setting ≥ 450ºC) 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 ( <3 LPM) & SAPH ON & Brg temp Hi ( 40ºC) 3. Other LOP trips & SAPH ON & Brg temp Hi ( 40ºC) 4. other LOP Off & SAPH ON & Brg temp Hi ( 40ºC) AUTO OFF: 5. Bearing temp < 35ºC 6. OFF CMD


14


11.2 SAH BEARING LOP START PERMISSIVES: 1. Guide Bearing Temperature not low > 35 o C 2. No Auto Off Command 3. MCC Not Disturbed. AUTO ON: 1. Other LOP OFF and start command 2. LOP-B On & LUb oil flow low ( <3 LPM) & SAPH ON & Brg temp Hi ( 40ºC) 3. Other LOP trips & SAPH ON & Brg temp Hi ( 40ºC) 4. other LOP Off & SAPH ON & Brg temp Hi ( 40ºC) AUTO OFF: 1. Bearing temp < 35ºC 2. OFF CMD


15


12

PRIMARY AIR HEATER. START PERMISSIVES : Electrical Motor 1. 2. 3. 4.

Guide Bearing oil temp Not high < 70 o C Bearing oil temp Not high < 70 o C No auto Off Command from SGC Electrical motor MCC Not Disturbed.

START PERMISSIVES : Air Motor 1. Thrust Brg Temp Not high 2. Guide Brg Temp Not high

< 70 o C < 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 ≥ 450ºC) 12.1 PAH GUIDE BEARING LOP START PERMISSIVES: 1. Guide Bearing Temperature not low > 35 o C 2. No Auto Off Command 3. MCC Not Disturbed. AUTO ON: 1. Other LOP OFF and start command 2. LOP-B On & LUb oil flow low ( <3 LPM) & SAPH ON & Brg temp Hi ( 40ºC) 3. Other LOP trips & SAPH ON & Brg temp Hi ( 40ºC) 4. other LOP Off & SAPH ON & Brg temp Hi ( 40ºC)


16


AUTO OFF: 1. Bearing temp < 35ºC 2. OFF CMD 12.2

PAH BEARING LOP

START PERMISSIVES: 1. Guide Bearing Temperature not low > 35 o C 2. No Auto Off Command 3. MCC Not Disturbed. AUTO ON: 1. Other LOP OFF and start command 2. LOP-B On & LUb oil flow low ( <3 LPM) & SAPH ON & Brg temp Hi ( 40ºC) 3. Other LOP trips & SAPH ON & Brg temp Hi ( 40ºC) 4. other LOP Off & SAPH ON & Brg temp Hi ( 40ºC) AUTO OFF: 1. Bearing temp < 35ºC 2. OFF CMD


17


13

HP BY SYSTEM

13.1 OIL SUPPLY PUMP FOR HP BY 1. 2. 3. 4.

Pump off: >150 Kg/cm2 Pump on: <110 Kg/cm2 Pressure too high: >160 Kg/cm2 Pressure too low: <90 Kg/cm2

13.2 VALVES CONDITIONS: 1 BP VALVE FAST OPEN CONDITIONS: 1. 2. 3. 4. 5. 6.

Turbine trip on Generator Breaker D11 Open Turbine LSR D12 on Emergency Fast Open PB Pressed Control deviation high > 8 Kg/cm2 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. 2. 3. 4.

BP Valve Priority Close Command OR BP Valve Position Transmitter failed. OR OSU-1 & OSU-2 Oil Pressure Very Low. OR 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%


18


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. 2. 3. 4.

BPE both DS Temp Signal disturbed BPE Valve Position TX failed BP-1 Auto Command blocking yes BPE-1 Temp TX Deviation high


19


14

EQUIPMENT: AC SCANNER AIR FAN AUTO START CONDITIONS: 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 AUTO START CONDITIONS: 1. No MFT & Scan - Furnace DP Low( TD 10 Sec) < 150 mm WC 2. 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 &


20


15

EQUIPMENT: SEAL AIR FAN

AUTO START CONDITIONS: 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 Closed


21


16.

LDO PUMP

START PERMISSIVE 1) MCC not disturbed 2) Pump not running 3) 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) AUTO START 1) Auto mode selected and 2) [Other pump on and LDO disch pr low or Other pump failed to start / tripped]

16.1 HFO PUMP START PERMISSIVE 1) MCC not disturbed 2) Pump not running 3) 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) AUTO START 1) Auto mode selected and 2) [Other pump on and HFO disch pr low or Other pump-B /C failed to start / tripped]


22


17. ERV Settings Sl. No. 1 2 3 4 5 6 7 8 9

Location

Valve Tag NO

MS LINE (L) MS LINE (L MS LINE (R) MS LINE (R) MS LINE (R) RH LINE (L) RH LINE (L) RH LINE (R) RH LINE (R)

SV 9 SV 10 SV11 SV12 SV13 SV 22 SV23 SV24 SV25


Set pressure Open 185.5 185.5 186.6 186.6 186.6 48.0 48.0 48.5 48.5

KSG Close 180.3 180.3 180.6 180.6 180.6 46.6 46.6 47.1 47.1

23


1.

TURBINE PROTECTIONS

Sr. No.

Description

1)

TG Lub oil pressure very low Axial shift high HP exhaust temp. high Condenser vaccum low(VSP) Condenser vaccum low(FSP) AND Turbine speed > 240 rpm HP casing top/btm DT high AND Load >100MW IP casing front top/ btm DT high AND Load >100MW IP casing rear top/ btm DT high AND Load >100MW MFT S/W & H/W Generator electrical protection S/W & H/W Liquid in Generator Main leads top Cold gas temp after cooler A&B high Cold gas temp after cooler C&D high Primary water temp after cooler high Seal oil temp after cooler high AS Hot air main exciter temp high Stator winding flow very low Stator Main bushing R flow low Stator Main bushing S flow low Stator Main bushing T flow low Turbine over speed trip (electrical) Turbine over speed trip H/W Oil tank level very low

2) 3) 4) 5) 6) 7) 8) 9) 10) 11) 12) 13) 14) 15) 16) 17) 18) 19) 20) 21) 22) 23) 24) 25) 26) 27) 28) 29) 30) 31)

Turbine trip from desk operated Turbine trip from bearing temp hi Turbine trip from ATRS Emergency trip from HMI Fire protection 1 or 2 operated Generator class B protection Low Vacuum Trip Device operated Manual Trip Device operated


Alarm Set point (< 4.5ksc) (+/-0.5 mm) (> 480 degc) --(> -0.8 ksc)

Trip set point

(> 90 degc)

(> 100 degc)

(> 90 degc)

(> 45 degc)

(> 90 degc)

(> 45 degc)

-----

-----

----(> 55 degc) (> 55 degc) (> 55 degc) (> 50 degc) (> 75 degc) (< 48 tph) (< 1.4 tph) (< 1.4 tph) (< 1.4 tph) (> 3300 rpm)

(> 90 mm) (> 60 degc) (> 60 degc) (> 60 degc) (> 60 degc) (> 80 degc (< 54 tph) (< 1.33 tph) (< 1.33 tph) (< 1.33 tph) (> 3330 rpm)

( 1000 mm from top) 90 degC ---------------

( 1150 mm from top) 130 degC ---------------

(< 1.2 ksc) (+/- 1.0mm) (> 500 degc) --(> -0.7 ksc)

24


2. TURBINE LUB OIL SYSTEM 2.1

AOP - 1

1) 2)

AUTO START SGC oil supply ON SLC AOP -1 ON AND [ AOP -2 trippd OR Oil Pr < 4.8 ksc ]

1) 2)

AUTO STOP SGC Oil Supply start-up step - 9 command SGC Oil Supply shutdown step - 55 command

1) 2)

PROTECTION STOP Oil tank level very low Fire protection - 2 operated

2.2

AOP - 2

1)

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

1) 2)

AUTO STOP SGC Oil Supply start-up step - 9 command SGC Oil Supply shutdown step - 55 command

1) 2)


2.3

EOP

1) 2)

3)

PROTECTION ON SLC EOP ON AND Lub oil pressure < 1.1 ksc Lub oil pressure < 1.1 ksc AND [ HP casing top mid temp > 120 degc OR HP casing bottom mid temp > 120 degc ] Lub oil press < 1.1 ksc ( Direct to DC Starter) ( Direct from Pr. Switch with SLC EOP-ON (MCM.Relay))


25


2.4

JOP -1

1)

START PERMISSIVE JOP -3 OFF

1)

AUTO START SLC JOP-1 ON AND Turbine Speed < 510 rpm

4) 5)

AUTO STOP SLC JOP -1 ON AND Turbine Speed > 540 rpm Turbine Speed < 510 rpm AND Jacking oil pressure < 150 ksc AND SLC JOP -3 ON TD15s Turbine Speed < 2800 rpm AND JOP -1 Voltage failed AND SLC JOP - 3 ON JOP -1 Tripped AND SLC JOP -3 ON SGC Oil Supply shutdown Step 54 command

1) 2)


1) 2)

3)

2.5

1)

1) 2)

3)

1) 2)

JOP - 3 START PERMISSIVE JOP -1 OFF AUTO START JOP -1 Tripped AND SLC JOP -3 ON Turbine Speed < 510 rpm AND Jacking oil pressure < 150 ksc AND SLC JOP -3 ON TD10s Turbine Speed < 2800 rpm AND JOP -1 Voltage failed AND SLC JOP - 3 ON PROTECTION STOP Oil tank level very low( > 1150 mm from top) Fire protection - 2 operated


26


2.6 1) 2)

TURNING GEAR OPEN PERMISSIVE Turbine speed > 15 rpm OR 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

1)

AUTO OPEN SLC Turning gear ON AND Turbine Speed < 210 rpm

1) 2)

AUTO CLOSE SLC Turning gear ON AND Turbine Speed > 240 rpm SGC Oil Supply shutdown step -51 command

1)

PROTECTION CLOSE Lub oil pressure < 1.2 ksc

2.7

OIL TEMP CONTROL V/V

1)

AUTO OFF SGC oil supply shutdown step -55 command

2.8

OIL VAPOUR EXTRACTOR -1

1) 2)

AUTO START Other vapour extractor tripped SGC oil supply start-up step -2 command

1)

AUTO STOP Standby Oil vapour extractor ON

2.9

OIL VAPOUR EXTRACTOR-2

1)

AUTO START OVE- 1 OFF and Disc

2.10 LEAKAGE OIL PUMP 1)

AUTO START Leakage oil tank level > 50%

1)

AUTO STOP Leakage oil tank level < min


27


3 TURBINE HPCF SYSTEM 3.1

HP CONTROL FLUID HEATER

1)

RELEASE ON Any HPCF circulation pumps ON AND HPCF temp control vlv closed

1) 2)

AUTO ON Control flow heater temp < 50 degc 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 ]

1) 2) 3) 4)

PROTECTION OFF Control flow heater temp > 75 degc Fire Protection-1 operated Fire Protection-2 operated Both HPCF circulation pumps OFF

3.2

HP CONTROL FLUID PUMP - 1

1) ksc 2)

AUTO START SLC HPCF Pumps ON AND HPCF pump 2 discharge pr. < 26 SLC HPCF Pumps ON AND HPCF pump 2 tripped

1)

AUTO STOP SGC HPCF shutdown step - 51 command

1)

PROTECTION OFF Fire Protection-1 OR Fire Protection-2 operated


28


3.3

1) ksc 2)

HP CONTROL FLUID PUMP- 2 AUTO START SLC HPCF Pumps ON AND HPCF pump 1 discharge pr. <26 SLC HPCF Pumps ON AND HPCF pump 1 tripped

1)


1)

PROTECTION OFF Fire Protection-1 OR Fire Protection-2 operated

3.4

HPCF VAP EXTR-1

1) 2)

AUTO START HP Control Fluid press > 30 ksc HPCF Vapour Extractor - 2 tripped

3.5

HPCF VAP EXTR-2

1)

AUTO START HPCF Vapour Extractor - 1 tripped

3.6

HPCF CIRCULATION PUMP-1

1)

START PERMISSIVE HPCF Circulation pump-2 OFF

1)

AUTO START SGC HPCF on AND HPCF press. > 30 ksc AND Any HPCF Vap Extractor ON

1)


1) 2)

PROTECTION OFF HPCF tank level < min Fire Protection -1 OR Fire Protection -2 operated


29


3.7

HPCF CIRCULATION PUMP-2

1)

START PERMISSIVE HPCF Circulation pump-1 OFF

1)

AUTO START HPCF press > 30 ksc AND HPCF pump-1 off TD5s

1)


1) 2)

PROTECTION OFF HPCF tank level < min Fire Protection -1 OR Fire Protection -2 operated

3.8

HPCF TEMP CONTROL VALVE

1)

AUTO OFF SGC HPCF shutdown step - 51 command


30


3.9

HPCF ALARMS

1)

Leakage Level High Leak speed chang device >Min OR Leak press TRANS INJW >Min OR Over speed governor >Min 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 HPCF Filter DP high Filter Supply Units DP > 0.6ksc OR CF filter DP > 0.6ksc OR LP By filter DP > 0.6 ksc Water CF Tank High CF Conductivity High HPCF Temperature Low/Fault < 50 degc HPCF Temperature High/Fault > 60 degc HPCF Pumps ½ Fault SLC HPCFs on with 10 sec delay AND Any HPCF auto on command HPCF Tank temp. low < 20 degc CONTIN Flow heater >75 degC HPCF Tank level high > 59 % < 650 mm from top HPCF Tank level low < 53 % > 800 mm from top HPCF Tank level very low < 50 % > 750 mm from top VAP EXTR System trouble Both HPCF VAP EXTR- ½ NOT ON AND HPCF pr > 30 Ksc

2)

3)

4) 5) 6) 7)

8) 9) 9) 10) 11) 12)


31


4 EVACUATION SYSTEM 4.1

VACCUM PUMP 1 & 2

1)

RELEASE START SEP water level > MIN

1)

RELEASE STOP System inlet valve closed

1) 2)

AUTO START SGC Start-up Step-3 command SLC vacuum pumps on AND Condenser pressure > 0.15 ksc

1) 2)

4.2

AUTO STOP Through SGC Evacuationstep-51 command SGC Evacuation start-up Step- 7 command AND Vacuum pump selected

VACCUM PUMP SOL INLET VALVE 1 & 2

1)

RELEASE OPEN Differential pressure across Inlet valve <0.15 ksc

1)

PROTECTION CLOSE Vacuum pump OFF status

1) 2)

AUTO OPEN SGC Start-up Step-3 command SLC vacuum pumps on AND Condenser pressure > 0.15 ksc

1) 2)

AUTO CLOSE SGC Evacuation shutdown step-51 command SGC Evacuation start-up Step- 7 command AND Vacm pump selected

4.3

SEAL WATER RECIRCULATION PUMP 1 & 2

1) 1)

ON RELEASE Separator water level > 360 mm Vac p/p -2 ON


32


1) 2)

AUTO START SGC start-up Step 3 command SLC vacuum pumps on AND Condenser pressure > 0.15 ksc

1)

CLOSE RELEASE Vacuum pump OFF

1) 2) 3)

AUTO CLOSE SGC Evacuation shutdown step-51 command SGC Evacuation start-up Step- 7 command Vacuum pump OFF

4.4

MAKE UP SOLENOID VALVE 1 & 2

1)

AUTO OPEN Level in separator tank < 330 mm

1)

AUTO CLOSE Level in separator Tank > 360 mm TD5s

4.5

SEAL STEAM CONDENSER EXHAUST VALVE – 1/2

1) 2)

1)

AUTO OPEN SGC evacuation start-up step 1 command Seal steam condenser other exhaust tripped (OFF or DISC) AUTO CLOSE SGC Evacuation Shutdown step 53 command ( Vacuum breaker open status is required).

1)

PROTECTION CLOSE Seal steam condenser level High.

4.6

SEAL STEAM CONDENSER SEAL VALVES

1)

AUTO OPEN SGC evacuation start-up step 1 command

1)

RELEASE OPEN Integral by valve open TD-5sec.


33


1)

PROTECTION CLOSE Seal steam condenser level-2 High

4.7

INT BY VALVE FOR SEAL STEAM CONDENSER

SEAL VALVES 1)

AUTO OPEN Seal steam condenser seal valve

1)

AUTO CLOSE Seal steam condenser seal valve open

4.8

SEAL STEAM CONDENSER SAFETY VALVE

1)

AUTO OPEN Seal steam condenser level-2 High.

1)

RELEASE OPEN Integral by valve open TD-5sec.

1)

AUTO CLOSE SGC evacuation start-up step 1 command

4.9

INT BY VALVE FOR SEAL STEAM CONDENSER SAFETY VALVES

1)

AUTO OPEN Seal steam condenser LEVEL -2 HIGH

1)

PROTECTION CLOSE Seal steam condenser SAFETY valve open

4.10 SEAL STEAM VAP EXHAUST ISOL VALVE - 1/2

1)

AUTO OPEN Seal steam condenser exhaust ON

1)

AUTO CLOSE Seal steam condenser exhaust OFF


34


4.11 EVACUATION ALARMS 1)

2)

3)

4)

5)

6)

7)

8)

9)

10)

Seal steam condenser level high Seal stm Cond lvl -1 high Seal stm Cond lvl -2 high 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 Seal Stm Cond Fault Seal stm cond lvl -2 high TD1m AND Seal stm cond SOV not open OR not closed Switch OFF Stand by Vaccum Pump Both Vacuum Pumps ON AND Generator Load > 5 % AND Condenser Press < 0.15 ksc Switch ON Stand by Vaccum Pump Generator Load > 5 % AND Condenser Press > 0.15 ksc Separator Water level < min Sep-1 water lvl < min Sep-2 water lvl < min 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 SLC Vaccum pump not ON SLC Vaccum pumps OFF AND Turbine Speed > 15 rpm VP Seal stm temp hi VP-1 Seal stm temp 40 degC VP-2 Seal stm temp 40 degC Seal Stm Cond Exh tripped Seal stm cond Exh.1 tripped Seal stm cond Exh.2 tripped


35


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


36


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 OR Fire 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


37


6.

EHTC SPEED REFRENCE TRACKS ACTUAL SPEED WHEN

1)

2)

( Load ctlr. o/p > speed ctlr. o/p + 5 % ) AND Speed actual < 3030 rpm AND Speed actual > 2940 rpm AND load ctlr. ON Turbine tripped SPEED REF DELAYED IS RESTRICTED IF

1) 2)

Generator breaker not ON AND ( NrTD - Nactual ) > 50 rpm Generator breaker not ON AND [ Power set point block OR TSC on & faulty] Speed ref > speed ref delayed AND Speed actual > 2850 rpm

AND

DN/DT ACTS WHEN 1)

Speed slope value low ( < 108 rpm / min ) AND Speed ctlr. output > 0 % AND Speed 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


38


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) 2)

Generator breaker off 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) 2) 3)

( Pact. < station load AND Load ctlr. error > 5 %) Generator Breaker off 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) 2) 3)

Boiler ctlr. is in manual Turbine follow Boiler from CMC not selected IP mode selected from OWS SPEED CTLR. IN ACTION IF

1) 2) 3) 4)

Generator Breaker off Turbine Tripped Ch - 1/Ch -2 Speed ctlr. o/p+100% < max(speed ctlr. o/p, load ctlr. o/p) Speed ctlr. o/p > Load ctlr. o/p


39


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 AND Starting 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


40


7 GENERATOR AUXILIARIES 7.0 1) 2)

PRIMARY WATER PUMP 1 & 2 AUTO START SLC PW pumps on AND PW Tank level > 155mm AND Other PW pump off SLC PW pumps on AND PW Tank level > 155mm AND Other PW pump on AND Pressure after other PW pump < 5 ksc

1) ksc 2)

STOP PERMISSIVE Stand by PW Pump on AND PW press. after std by pump > 5 TD5s SLC PW pumps off.

7.1

NaOH DOSING PUMP

1)

START RELEASE Treated water flow > min

1)

AUTO START Conductivity after ion exchanger < 1us/cm

1) 2) 2)

AUTO STOP Conductivity after ion exchanger > 3 us/cm TD10s OR Conductivity after main filter > 2.5 us/cm TD10s OR NaOH tank level < min

1)

PROTECTION STOP Treated water flow < min

7.2

PW TEMP CONTROL VALVE

1)

PROTECTION OPEN PW inlet temp > 66 degc


41


7.3

SEAL OIL PUMP - 1 AIR SIDE

3) 4)

AUTO START SLC SO Pump ½ (AS) on AND SO storage tank level not low AND SO pump 2 (AS) off SLC SO Pump ½ (AS) on AND SO storage tank level not low AND SO pump 2 (AS) on AND SO pr after SOP-2 (AS) < 05 ksc TD2s SO p/p-2 OFF and SO p/p-2 discrepancy SGC Gen seal oil Start-up step-1 command

1) 2)

STOP PERMISSIVE SO pump 2 (AS) on AND SO pr after SOP-2 (AS) > 5 ksc TD5s SLC SO pump ½ (AS) off

1) 2)

7.4

1)

2)

1) 2)

7.5

1) 2) 3)

4)

1)

SEAL OIL PUMP - 2 AIR SIDE AUTO START SLC SO Pump ½ (AS) on AND SO storage tank level not low AND SO pump 1 (AS) on AND SO pr after SOP-1 (AS) < 5 ksc TD2s SLC SO Pump ½ (AS) on AND SOP-1 (AS) OFF and discrepancy . STOP PERMISSIVE SO pump 1 (AS) on AND SO pr after SOP-1 (AS) > 5 ksc TD5s SLC SO pump ½ (AS) off

SEAL OIL PUMP - 3 AIR SIDE (DC) AUTO START DC SOP local PB On command with local selected SLC DC SOP - 3 On AND SO/H2 DP (TE/EE) < 0.9 ksc TD2s SLC DC SOP - 3 On AND [ SO pump 1 (AS) OFF OR SO pr after SOP -1 (AS) <5 ksc ] TD2s SLC DC SOP - 3 On AND [ SO pump 2(AS) OFF OR SO pr after SOP -2 (AS) < 5 ksc ] TD2s PROTECTION START Both Seal oil pump (AS) tripped AND SLC ON


42


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.

1) 2)

7.6

MANUAL STOP DC SOP local PB off command with local selected Remote selected & Remote off command

SEAL OIL PUMP - 4 H2 SIDE

1)

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

1)

AUTO START SGC Gen seal oil start-up Step 3 Command

1) 2)

PROTECTION STOP Seal oil tank level low SOP Pressure air side < 4.5 ksc TD3s

7.7

1)

2) 3)

BEARING EXHAUST FAN 1 & 2 AUTO START SLC Brg exhaust fan on AND Other Brg exhaust Fan on AND Press at respective Brg exhaust fan > -5 mbar TD2s SLC Brg exhaust fan on AND Other Beg exhaust Fan off SGC Gen seal oil start-up step-1 command

2)

STOP PERMISSIVE Other Brg exhaust fan on AND Press at respective Brg exhaust < -5 mbar TD5s SLC Brg exhaust fan Off

7.8

EXCITER AIR DRIER

1)

AUTO ON SLC Air Drier on AND Turbine speed < 210 rpm

1)


43


1)

OFF PERMISSIVE Exciter Shut down Heater off

1)

AUTO OFF Turbine speed > 240 rpm AND Exciter Shut down Heater Off AND SLC Air Drier On

7.9

EXCITER SHUT DOWN HEATER

1)

ON PERMISSIVE Air drier on

1)

AUTO ON SLC air drier on AND Air Drier On AND Turbine speed <210 rpm AND Cold air temp < 45 degc

1)

AUTO OFF SLC air drier on AND [Turbine speed > 240 rpm OR Cold air temp >50 degc]

1) 2)

PROTECTION OFF Cold air temp > 90 degc Air drier off

7.10 CO2 FLASH EVAPORATOR

1)

AUTO ON SLC CO2 Flash Evaporator On AND CO2 Flash Evaporator temp. < 145 degc

1)

AUTO OFF: SLC CO2 flash evaporator off

1)

PROTECTION OFF: CO2 Flash Evaporator temp. > 150 degc

7.11 COLD GAS TEMP CONTROL VALVE

1)

PROTECTION ON Cold gas temp > 55 degc


44


7.12 GAS DRIER HEATER

1)

1)

START PERMISSIVE: Gas drier blower ON for 10 min AUTO ON SLC gas drier ON AND Air temp at drier outlet < 60 degc TD10s

1)

AUTO OFF Air temp. at Gas exhaust > 100 degc

1) 2) 3)

PROTECTION OFF Gas drier blower off Gas drier heater temp > 150 degc Gas drier blower ON for 4 hrs

7.13 GAS DRIER BLOWER

1)

START PERMISSIVE Gas drier blower LS-1 OR 2 open

1)

AUTO ON SLC gas drier ON

1)

OFF PERMISSIVE Gas drier heater off

1)

AUTO OFF SLC gas drier ON AND Air temp. at drier O/L < 60° C AND Htr not On


45


7.14 GAMP ALARMS 1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 11) 12) 13) 14) 15) 16) 17) 18) 19) 20) 21) 22) 23) 24) 25) 26) 27) 28) 29) 30) 31) 32) 33) 34) 35) 36) 37) 38) 39) 40)

Oil level in Pre chamber (TE/EE) High Liquid at main leads bottom High Liquid at main leads top High Level in SOST low Pressure after AC SOP -1/2 (AS) low ( < 5 ksc) Pressure after DC SOP -3 (AS) low ( < 5 ksc) Pressure after AC SOP -4 (H2S) low ( < 5 ksc) DP across SO filter AS/H2S High ( > 0.9 ksc) SO Pr. (TE/EE) Air side Low ( < 4.5 ksc) SO temp after cooler (AS) High (> 50 degc) SO temp after cooler (H2S) High (> 50 degc) SO temp after cooler V High (> 55 degc) SO/H2 Diff Pr (TE AND EE ) High (>1.7 ksc) SO/H2 Diff Pr (TE AND EE ) low (< 0.9 ksc) H2 Pressure in Manifold low ( < 15 ksc) H2 Pressure in Gen Casing low ( < 3.3 ksc) H2 Pressure in Gen Casing High ( > 3.8 ksc) H2 purity in Gen Casing low ( < 95 %) PW Pr. after Pump ½ low (< 5 ksc) DP Pr. Winding High ( > 1.5 ksc) PW temp after cooler V High ( > 55 degc) Stator Wdg Flow low ( < 54 m3/hr) Stator Wdg Flow V low ( < 48 m3/hr) Flow through R bush V low ( < 1.33 m3/hr) Flow through S bush V low ( < 1.33 m3/hr) Flow through T bush V low ( < 1.33 m3/hr) PW Pr. at stator Wdg I/L High ( > 3.8 ksc) Hot Gas temp. Coolers A AND B High ( > 60 degc) Hot Gas temp. Coolers C AND D High ( > 60 degc) Cold Gas temp. Coolers A AND B High ( > 55 degc) Cold Gas temp. Coolers C AND D High ( > 55 degc) Cold Gas temp. Coolers V High ( > 60 degc) Temperature Hot Air Main Exciter High ( > 75 degc) Temperature Hot Air Main Exciter V High ( > 80 degc) PW press. Stator I/L Low ( < 2.8 ksc) SO Pr. AS (TE/EE) Low ( < 4.9 ksc) PW temp at o/l High ( > 60 degc) Conductivity after Winding High ( > 3 uS/cm) TD5m Conductivity after main filter High ( > 3 uS/cm) TD5m Conductivity after Ion exchanger low (< 1uS/cm) TD5m


46


8

TDBFP

8.1 PROTECTION 1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 11) 12) 13) 14) 15) 16) 17) 18) 19) 20) 21) 22) 23) 24) 25) 26)

TDBFP working AND suction flow very low ( < 100 tph ) Deaerator level very low ( < -1610 mmwc) TDBFP Lub oil header press. very low ( < 1.0 ksc) TDBFP Suction valve not open TDBFP Exhaust stm temp very high ( > 120 degc) TDBFP Live steam pressure very high ( > 12.5 ksc) TDBFP Exhaust steam pr. very high ( > -0.6 ksc) Governing oil press. very low ( < 4.5 ksc) Trip oil press. very low ( < 2 ksc) Turbine Axial shift high ( > 0.7 mm) Turbine eccentricity very high ( > 92 mic) Trip PB operated Trip command from OWS Turbine over speed ( > 6300 rpm ) Turbine GB i/p vibration very high ( > 70 mic) Turbine GB o/p vibration very high ( > 70 mic) Turbine FJB vibration very high ( > 70 mic) Turbine RJB vibration very high ( > 70 mic) Turbine GB brg temp very high ( > 120 degc) Turbine bearing temp very high ( > 120 degc) Booster pump brg temp very high ( > 95 degc) Booster pump thrust brg temp very high ( > 105 degc) BFP thrust brg temp metal very high ( > 105 degc) BFP brg temp very high ( > 95 degc) FW Suction / disch DT high ( > 15 degc ) TDBFP working AND suc flow < Variable set point trip


47


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 AND TDBFP 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 AND Aux steam superheat > 50 degc AND TDBFP suction / disch DT > 10 degc

8.3

1) 1) 2) 3)

1) 2) 3) 4)

TDBFP DISCHARGE VALVE

OPEN PERMISSIVE TDBFP discharge IBV open AUTO OPEN SGC TDBFP turbine start-up step 34 cmd TDBFP working AND Discharge press. > 40 ksc TDBFP discharge IBV open and OPEN cmd from OWS AUTO CLOSE SGC TDBFP turbine start-up step 21 cmd SGC TDBFP turbine shutdown step 55 cmd TDBFP Tripped TDBFP not working AND Discharge header press > 60 ksc


48


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

1)

2)

TDBFP RECIRCULATION VALVE CLOSE PERMISSIVE TDBFP suction flow >550 tph AND FW suction / disch. DT < 10 degc AND No auto open command TDBFP not working AND No auto open command

3) 4)

AUTO OPEN TDBFP Working. AND [ Suction flow < 400 tph OR FW suc./disch. DT > 10 degc OR Suction flow measurement fault ] SGC TDBFP turbine start-up step 20 cmd SGC TDBFP turbine shutdown step 55 cmd

1) 2)

PROTECTION OPEN TDBFP suction flow < 250 tph TDBFP not working

1)

1) 2) 3)

AUTO CLOSE TDBFP suction flow > 850 tph AND FW suc./disch. DT < 10 degc TD- 5 sec SGC TDBFP turbine start-up step-39 cmd 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


49


8.5 TDBFP REMOTE ENGAGEMENT SOLENOID V/V

1)

OPEN / ENERGISE PERMISSIVE 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

1)

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

1) 2)

AUTO CLOSE / DEENERGISE TDBFP remote engagement oil pressure > 3.5 ksc SGC TDBFP turbine start-up step 24 cmd

8.6 TDBFP OIL VAPOUR EXTRACTOR FAN- A & B

2) 3)

AUTO START Other OVE tripped Other OVE off AND SGC TDBFP oil supply start-up step-1 cmd

1)

AUTO STOP SGC TDBFP oil supply shutdown step-58 cmd.


50


8.7 TDBFP LUB OIL PUMP - A & B

1) 2) 3)

4)

1) 2) 3)

1)

AUTO START Other LOP tripped Other LOP start cmd given AND pump not ON TD2s [ TDBFP working OR Other LOP ON ] AND [ Lub oil disch. hdr. press. < 1.5 ksc OR LOP disch. press. < 7 ksc ] Other LOP off AND SGC TDBFP oil supply start-up stp-2 cmd RELEASE STOP TDBFP not working TDBFP speed zero and TDBFP speed <= 10 rpm Other LOP ON AND L.O. disch. hdr. press. > 1.5 ksc AND LOP disch. press. > 7 ksc AUTO STOP SGC TDBFP oil supply shutdown step-57 cmd

8.8 TDBFP EMERGENCY OIL PUMP

1)

1)

1)

AUTO START EOP Auto on selected AND TDBFP lub oil hdr. press. very low RELEASE STOP [ EOP Auto on not selected OR TDBFP lub oil hdr. press. not very low ] AND [ Any LOP on OR TDBFP speed zero ] AUTO STOP SGC TDBFP oil supply shutdown Step-57 cmd


51


8.9 TDBFP JACK OIL PUMP

1) 2) 3)

AUTO START TDBFP Turbine speed < 510 rpm SGC TDBFP oil supply start-up step-7 cmd SGC TDBFP oil supply shutdown step-53 cmd

1) 2)

STOP PERMISSIVE Speed zero and TDBFP speed <= 10 rpm TDBFP Turbine speed > 540 rpm

1) 2) 3)

AUTO STOP SGC TDBFP oil supply start-up step-9 cmd SGC TDBFP oil supply shutdown step-56 cmd TDBFP Turbine speed > 540 rpm

8.10 TDBFP TURNING GEAR VALVE

2)

AUTO OPEN [TDBFP turbine Speed < 510 rpm SGC TDBFP oil supply start-up step-6 cmd SGC TDBFP oil supply shutdown step-52 cmd] AND LO to turning gear valve closed OR Speed <=120 rpm

1) 2)

RELEASE CLOSE TDBFP turbine Speed > 540 rpm TDBFP turbine Casing temp < 85 degc

1) 2) 3) 4)

AUTO CLOSE: TDBFP turbine Speed > 540 rpm SGC TDBFP oil supply start-up step-9 cmd SGC TDBFP oil supply shutdown step-55 cmd LO to turning gear valve Open AND Speed >=200 rpm

1)

8.11 TDBFP ENGAGE SOLENOID VALVE

1)

RELEASE OPEN / ENERGISE TDBFP Speed zero AND Speed < 10 rpm AND TDBFP Engage / diseng oil pump on


52


AUTO OPEN / ENERGISE 1) SGC TDBFP oil supply start-up step-5 cmd

1)

1)

RELEASE CLOSE / DEENERGISE TDBFP Speed zero AND Speed < 10 rpm AND TDBFP Engage / diseng oil pump on AUTO CLOSE / DEENERGISE SGC TDBFP oil supply start-up step-6 cmd

8.12 TDBFP DISENGAGE SOLENOID VALVE

1)

RELEASE OPEN TDBFP turb. Speed < 300 rpm AND TDBFP engage / diseng oil pump ON

8.13 TDBPF ENGAGE / DISENGAGE OIL PUMP

1)

START PERMISSIVE TDBFP LOP discharge hdr. press. not low >1.5 kg

1)

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

1)

AUTO STOP : TDBFP pump engaged OR disengaged TD5s


53


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 (<2%)] AND [MDBFP not in standby OR Reverse Rotation not acted ] TRIP PROTECTIONS

1) 2) 3) 4) 5) 6)

MDBFP ON for 15s AND Corrected spd is more than suct flow (>50 tph) MDBFP suction flow low ( < 100 tph) TD30s HC lub oil header press. very low (< 0.8 ksc) 2/3 HC working oil temp very high (>130 degc) 2/3 HC working oil press very low (<2.2 ksc) 2/3 MDBFP suction valve not open


54


7) 8) 9) 10) 11) 12) 13) 14) 15) 16) 17)

MDBFP suction & discharge DT >15 degc 2/3 Lub oil temp. downstream clr very high (> 60 degc) 2/3 MDBFP journal bearing temp very high (> 95 degc) MDBFP thrust bearing temp. very high ( >105 degc) MDBFP motor winding temp very high ( >130 degc) D/A level very low (< -1610 mm) 2/3 MDBFP motor journal bearing temp very high (> 90 degc) Hyd. coupling bearing temp very high (> 95 degc) Booster pump thrust bearing temp very high (> 105 degc) Booster pump journal bearing temp very high (> 95degc) EPB acted

2)

MDBFP AUTO START [ MD BFP in Standby AND [ TD BFP-A tripped OR TD BFP-B tripped ] ] Command from MDBFP Startup Sequence Step # 07

1)

MDBFP AUTO STOP Command from MDBFP Shutdown Sequence step # 51

9.1

MDBFP AOP

1) 2) 3) 4) 5) 6) 7)

AOP AUTO START MDBFP Auto Start MDBFP ON AND Lub oil press. low (<1.2 ksc) 2/3 TD2s Command from Shutdown Sequence Step # 52 MDBFP Suction press. high (> 15ksc) AND BFP OFF MDBFP OFF AND MDBFP Reverse Rotation Acted Command from Startup Sequence Step # 06 MDBFP OFF AND 30 minutes hasn't elapsed to BFP OFF status.

1)

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

1) 2) 3) 4)

AOP AUTO STOP MDBFP ON AND LO press. high (> 2.5 ksc) 2/3 TD2s Command from Startup sequence step # 13- A Command from Shutdown sequence step # 54- A MDBFP OFF for 30 min AND Any bearing temp. not high


55


9.2

MDBFP RECIRCULATION VALVE

4) 5) 6)

AUTO OPEN MDBFP flow measurement fault MDBFP ON AND Suction flow < 400 tph AND Its Variable Set point Fault MDBFP ON AND Its Variable Set Point no fault AND Diff of MDBFP Suction flow and Corrected Spd less than 5 MDBFP ON AND Discharge / Suction DT >10 degc Command from Startup sequence step # 02- A Command from Shutdown sequence step # 52- B

1) 2)

PROTECTION OPEN MDBFP Suction flow low (<250 tph) MDBFP OFF

1) 2)

3)

1)

2)

1) 2)

tph

CLOSE PERMISSIVE [ [ MDBFP Suction flow more than 550 tph AND It's Variable Set Point no Fault AND Diff of MDBFP Suction flow & It's corrected Spd > 50 tph ] OR MDBFP Suction flow > 850 tph ] AND MDBFP Disch / Suction DT <10 degc MDBFP OFF AUTO CLOSE Command from Sequence Startup step # 19- A [ [ MDBFP Suction flow more than 550 tph AND It's Variable Set Point no Fault AND Diff of MDBFP Suction flow & It's corrected Spd > 50 tph ] OR MDBFP Suction flow more (>850 tph) ] AND MDBFP Disch /Suction DT <10 degc

9.3

MDBFP DISCHARGE VALVE

1) 2) 3)

AUTO OPEN MDBFP ON AND Discharge press. > 40 ksc TD2s Command from Startup Sequence Step # 16 Any TDBFP ON AND MDBFP Standby Selected AND Disch. header press. > 60 ksc


56


1)

1) 2) 3) 4) 5) 6)

OPEN RELEASE Discharge Valve I.B.V Opened AND Reverse Rotation Not Acted AUTO CLOSE MDBFP OFF AND in Stdby AND MDBFP Reverse rotation acted MDBFP OFF AND in Stdby AND MDBFP Suction press. > 15 ksc MDBFP OFF Command from Sequence Startup Step # 06-A Command from Sequence Shutdown Step # 53-A MDBFP OFF AND in standby AND Discharge press. < 40 ksc TD2m

1)

CLOSE RELEASE MDBFP OFF

9.4

MDBFP DISCHARGE IBV

1) 2) 3)

AUTO OPEN MDBFP ON AND MDBFP Disch header. press. > 40 ksc TD1s Command from Startup Sequence Step # 15- A MDBFP Selected standby AND Any TDBFP ON AND Discharge header press. > 60 ksc TD2s

1) 2) 3) 4)

AUTO CLOSE Command from Startup Sequence Step # 06- B Command from Startup Sequence Step # 17- B MD BFP Discharge valve opened Command from Shutdown Sequence Step # 53- B

9.5

MDBFP RAPID START-UP SOLENOID - 91/92

1) 2)

AUTO OPEN MD BFP Auto Start Command from Startup Sequence Step # 05- A


57


AUTO CLOSE 1) MD BFP ON for 5.sec 2) MD BFP Reverse Rotation Acted 3) Command from Startup Sequence Step # 11- A 2) MD BFP STDBY SELECTED & MD BFP Reverse Rotation Acted 3) MD BFP STDBY SELECTED & SUC PR >15 KG

1)

OPEN RELEASE MD BFP standby selected AND Its Reverse Rotation Not Acted

9.6

MDBFP CW VALVE

1) 2)

AUTO OPEN MD BFP ON Command from Startup Sequence Step # 10- A

1)

CLOSE RELEASE MD BFP OFF

1)

2) 3) 4)

AUTO CLOSE MD BFP Selected standby AND Discharge header press. > 60 ksc TD2s AND Any TDBFP ON Command from Startup Sequence Step # 01-A Command from Shutdown Sequence Step # 53- C MD BFP OFF


58


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) 2) 3) 4) 5) 6) 7)

Hotwell Level very low ( < - 1850 mm ) 2/3 CEP ON AND Discharge press. low ( < 18 ksc ) CEP ON for 10 sec AND Flow through CEP low ( < 300 tph) TD5s Thrust bearing temp. very high ( > 105 degc) Motor bearing temp. very high ( > 90 degc) Motor winding temp. very high ( > 130 degc) Suction valve not open AUTO START

1) 2)

3)

Pump Selection Standby AND Other Running pump Tripped Pump Selection Standby AND Any other pump ON for 30 sec AND Discharge header press. low (<20 ksc) Command from CEP startup sequence step # 103 AUTO STOP

1)

Command from CEP shutdown sequence step # 201


59


10.1 CEP DISCHARGE VALVE AUTO OPEN

1) 2) 3)

CEP ON AND Discharge press. > 18 ksc TD2s CEP Discharge press. > 18 ksc AND Any other CEP ON AND CEP Standby Selected TD5s Command from CEP Startup sequence step # 106 OPEN RELEASE

1)

Discharge Valve I.B.V Open CLOSE RELEASE

1)

CEP OFF AUTO CLOSE

1) 2) 3) 4)

CEP Stdby Selected AND Disch hdr. press. < 20 ksc CEP OFF Command from CEP Startup sequence step # 102 Command from CEP Shutdown sequence step # 202

TD2m

DISCHARGE VALVE I.B.V AUTO OPEN

1) 2)

CEP ON AND Discharge press. > 18 ksc TD2s CEP discharge press. > 18 ksc AND Any other CEP ON AND CEP Standby Selected TD5s DISCHARGE VALVE I.B.V AUTO CLOSE

1)

Discharge valve opened

10.2 CEP VENT VALVE AUTO OPEN

1) 2) 3) 4)

CEP discharge press. > 18 ksc AND Any other CEP ON AND CEP Standby Selected TD5s CEP OFF Command from CEP Startup sequence step # 103 Command from CEP Shutdown sequence step # 202 AUTO CLOSE

1)

CEP ON OPEN RELEASE

1)

CEP OFF


60


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) 2) 3) 4) 5)

Pump ON for 08 sec AND Discharge press. high (>4.5 ksc ) Pump ON for 120sec AND Discharge valve not open Pump ON and Suction Valve Not Open TD- 30 sec Pump ON AND Any other ACW ON AND Common discharge hdr. press. > 4.5 ksc 2/3 TD30s Suction header press. < 0.2 ksc 2/3 TD5s AUTO START

1) 2) 3)

Pump Selected Standby AND Any other ACW tripped P/p Selected Stdby AND Any other p/p ON AND Dischg hdr. pr < 2.3 ksc Command from ACW Startup Sequence Step # 3-A

11.1 ACW PUMP DISCHARGE VALVE AUTO OPEN

1) 2) 3)

Pump Stdby Selected AND any other ACW ON AND Discharge header press. > 2.3 ksc AND ACW-A OFF Pump ON AND Discharge press. > 2.3 ksc Command from ACW Startup Sequence Step # 4-A AUTO CLOSE

1) 2) 3) 4)

Pump Selected stdby AND Disch hdr pr < 2.3 ksc AND ACW OFF TD10s ACW OFF Command from ACW Startup Sequence Step # 1-A Command from ACW Shutdown Sequence Step # 52-A PERMISSIVE TO CLOSE

1)

ACW-A OFF


61


11.2 ACW PUMP SUCTION VALVE AUTO OPEN

1) 2)

Pump Stdby Selected. Command from ACW Startup Sequence Step # 02-A AUTO CLOSE

1) 2)

Command from ACW Shutdown Sequence Step # 52-A. ACW-A OFF PERMISSIVE TO CLOSE

1) ACW-A OFF


62


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 OR Overhead tank level not low ( > 950 mm) ECW STANDBY CONDITION

1) 2) 3) 4) 5)

Discharge v/v closed ECW standby selected AND Discharge v/v open Motor winding temp. < 125 degc AND Motor bearing temp. < 85 degc AND Overhead tank level not low ( > 950 mm) TRIP PROTECTIONS

1) 2) 3) 4) 5) 6)

ECW ON for 60sec AND Discharge valve not open Suction valve not open ECW ON AND Discharge hdr. press. very high (> 8.5 ksc) Suction header press. very low (< 0.2 ksc) 2/3 Motor winding temp very high (> 130 degc) Motor bearing temp very high (> 90 degc) AUTO START

1) 2) 3)

Pump Selection Standby AND Any other pump Tripped Pump Selection Standby AND Any other pump ON AND Discharge hdr. pr. low Command from Startup Sequence Step # 3 AUTO STOP

1)

Command from Shutdown Sequence Step # 51


63


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) 2) 3) 4)

Pump Selected standby AND Discharge header press. < 3 ksc Pump OFF Command from Shutdown Sequence Step # 202 Command from Startup Sequence Step # 101

12.2

ECW O/H TANK MAKE UP VALVES (SG + TG) EMG MU VALVE AUTO OPEN

1)

ECW O/H Tank Level low (<= 1150 mm) EMG MU VALVE AUTO CLOSE

1)

ECW O/H Tank Level high (<= 1450 mm) NORMAL MU VALVE AUTO OPEN

1)

ECW O/H Tank Level normal (>= 950) TD-5 sec NORMAL MU VALVE AUTO CLOSE

1)

ECW O/H Tank Level high (<= 1350 mm) TD-5 sec


64


13

LP BY

1)

LP By 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 by 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 by, i.e. failure of the by 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 by stop valves are fully open (<100%) nor all by control valves are at least opened around 60% position, the command for opening the reheater safety valves is given after a delay of 5 seconds. 2. When valve position ref set point exceeds a set limit value (>25 %) and all LP by 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


65


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) 2)

HT PR control valve ASV 22 > 2 % open HT PRDS Isolating vlv ASV 21 IBV open AUTO CLOSE

1)

HT PR control valve ASV 22 < 2 % open TD-1.5 sec PROTECTION CLOSE

1) 2)

HT PRDS Temperature V High > 350 degc LT PRDS Temperature V High > 285 degc

14.2 HT PRDS ISOL. VALVE ASV 21 IBV AUTO OPEN

1) 2)

HT PRDS Isolating vlv ASV 21 IBV open HT PR control valve ASV 22 > 2 % open AUTO CLOSE

1) 2)

HT PRDS Isolating vlv ASV 21 open HT PR control valve ASV 22 < 2 % open PROTECTION CLOSE

1) 2)


14.3 HT PR CONTROL VLV ASV 22 PROTECTION CLOSE

1) 2) 3) 4)

MFT operated HT PRDS Temperature V High > 350 degc LT PRDS Temperature V High > 285 degc CRH press > 18 ksc AND ASV 22 <10 % open


66


14.4 LT PRDS INLET ISOLATING VLV ASV 25 AUTO OPEN

1)

LT PR control valve ASV 26 > 2% open AUTO CLOSE

1) 1)

LT PR control valve ASV 26 <2 % open RELEASE CLOSE LT PR control valve ASV 26 <2 % open PROTECTION CLOSE

1) 2)


14.5 LT PRDS CV BYP VLV ASV 28 CLOSE PERMISSIVE

1)

LT PR CV by valve ASV 29 close PROTECTION CLOSE

1) 2)


14.6 LT PR CONTROL VLV ASV 26 AUTO CLOSE

1)

CRH press < 18 ksc PROTECTION CLOSE

1) 2) 3)

MFT operated HT PRDS Temperature V High > 350 degc LT PRDS Temperature V High > 240 degc

14.7 LT PRDS DESH. VALVE ASV 181 AUTO OPEN

1) 2)

HT PR control valve ASV 22 > 2% open LT PR control valve ASV 26 > 2% open AUTO CLOSE

1)

HT PR control valve ASV 22 < 2% open AND LT PR control valve ASV 26 < 2% open


67


14.8 SPRAY BLOCK VALVE to PRDS FDV 43 AUTO OPEN

1) 2)

HT PR control valve ASV 22 > 2% open LT PR control valve ASV 26 > 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) 2) 3)

HT PR control valve ASV 22 < 2% CLOSE LT PR control valve ASV 26 < 2% CLOSE 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) 2)

[HT PR control valve ASV 22 > 2% open OR HT APRDS spray control vlv FDV 30 >2 % open] AND Main line selected AUTO CLOSE

1)

HT PR control valve ASV 22 <2% open RELEASE CLOSE

1)

HT PR control valve ASV 22 <2% open PROTECTION CLOSE

1) 2)

By line selected HT APRDS spray control vlv FDV 30 <2 % close

14.10 HT PRDS SPRAY PR. CONTROL VLV FDV 30 AUTO CLOSE

1) 2)

HT PR control valve ASV 22 < 2% close By line selected PROTECTION CLOSE

1)

MFT operated


68

PROTECTIONS AND INTERLOCKS DIARY FORCED AUTO

1) 2)

HT PR control valve ASV 22 > 2 % open AND Main line selected

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) 2)

HT PR control valve ASV 22 > 2 % open AND Main line selected

14.12 LT PRDS SPRAY ISOLATING VLV FDV 33 AUTO OPEN

1) 2)

[LT PR control valve ASV 26 > 2% open OR HT PR control valve ASV 22 > 2% open] and Main line selected RELEASE CLOSE

1)

LT PR control valve ASV 26 < 2% open AND HT PR control valve ASV 22 <2% open PROTECTION CLOSE

1) 2)

By line selected HT APRDS spray control vlv FDV 35 <2 % close AUTO CLOSE

1) 2) 3)

AS22 <2% close AND AS26 <2% close AND AS29 <2% close

14.13 LT PRDS B/P SPRAY ISO VLV FDV 37 AUTO CLOSE

1) 2) 3)

AS22 <2% close AND AS26 <2% close AND AS29 <2% close


69

PROTECTIONS AND INTERLOCKS DIARY AUTO OPEN

1) 2)

[LT PR control valve ASV 26 > 2% open OR HT PR control valve ASV 22 > 2% open] and By line selected RELEASE CLOSE

1)

LT PR control valve ASV 26 < 2% open AND HT PR control valve ASV 22 <2% open PROTECTION CLOSE

1) 2)

Mains line selected HT APRDS spray control vlv FDV 35 <2 % close

14.14 LT PRDS SPRAY PR. CONTROL VLV FDV 35 AUTO CLOSE

1)

HT PR control valve ASV 22 < 2% close AND LT PR control valve ASV 26 < 2% close AND LT PR control valve ASV 29 < 2% close PROTECTION CLOSE

1)


1) 2)

[HT PR control valve ASV 22 > 2 % open OR LT PR control valve ASV 26 > 2% open] AND Main line selected

14.15 LT PRDS SPRAY CONTROL VALVE FDV 46 AUTO CLOSE

1)

HT PR control valve ASV 22 < 2% close AND LT PR control valve ASV 26 < 2% close AND ASV 29 < 2% open PROTECTION CLOSE

1)


1) 2)

[HT PR control valve ASV 22 > 2 % open OR LT PR control valve ASV 26 > 2% open] AND Main line selected


70


15 LP HEATERS 15.1 LPH CONDENSATE INLET ISO. VALVE OPEN RELEASE

1)

LPH Cond. I/L Isolating valve I.B.V Open AND LPH Level Not HI AUTO OPEN

1)

Command from Startup Sequence Step # 02- A CLOSE RELEASE

1)

LPH By Valve Opened AUTO CLOSE

1)

Command from Shutdown Sequence Step # 52- A PROTECTION CLOSE

1)

LPH By Valve Not Closed AND LPH Level very high 2/3

15.2 LPH CONDENSATE OUTLET ISO. VALVE OPEN RELEASE

1)

LPH Level Not HI AUTO OPEN

1)

Command from Startup Sequence Step # 02- A CLOSE RELEASE

1)

LPH By Valve Open AUTO CLOSE

1)

Command from Shutdown Sequence Step # 52- B PROTECTION CLOSE

1)

LPH By Valve Not Closed AND LPH Level very high 2/3


71


15.3 LPH CONDENSATE INLET ISO. IBV OPEN RELEASE

1)

LPH Level Not HI AUTO OPEN

1)

Command from Startup Sequence Step # 01-A AUTO CLOSE

1) 2) 3)

Command from Startup Sequence Step # 03-A Command from Shutdown Sequence Step # 52-D LPH Cond. I/L Isolating valve open PROTECTION CLOSE

1)

LPH Level very high 2/3

15.4 LPH BY 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) 2)

LPH Cond. I/L AND O/L Isolating valve Open Command from Startup Sequence Step # 03- B PROTECTION OPEN

1)

LPH Level very high 2/3


72


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) 2) 3) 4) 5)

Turbine Tripped LPH Level very high 2/3 LPH Cond. I/L Isolating valve Not Open LPH Cond. O/L Isolating valve Not Open LPH Cond. By Valve Not Close EXT STM DRN VALVE AUTO OPEN

1) 2) 3)

Command from Startup Sequence Step # 01- B Command from Shutdown Sequence Step # 51- A LPH EXT STM Isolating valve close EXT STM DRN VALVE AUTO CLOSE

1) 2)

Command from Startup Sequence Step # 05- A LPH EXT STM Isolating valve open EXT STM DRN VALVE PROTECTION OPEN

1) 2)

LPH Level very high 2/3 Turbine Tripped


73


16. HP HEATERS 16.1 HPH 5A FW INLET ISOLATING VALVE OPEN RELEASE

1) 2)

HPH-5A FW I/L isolating valve I.B.V opened AND HPH-5A/6A level < 135 mm 2/3 (Not Hi) AUTO OPEN

1)

Command from Startup Sequence Step # 03-A CLOSE RELEASE

1)

2)

[HPH FW 50% BYP Valve Opened AND HPH-5B FW I/L Iso. Valve Opened AND HPH-6B FW O/L isolating valve opened] OR HPH FW 100% by 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

1) 2)

Command from Startup Sequence Step # 1-A HPH -5A iso valve open CMD PERMISSIVE OPEN

1)

HPH -5A/6A level not high AUTO CLOSE

1) 2) 3)

Command from Startup Sequence Step # 62-E HPH-5A FW I/L isolating valve open HPH-5A FW I/L isolating valve Close CMD PROTECTION CLOSE

1)

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


74


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

1)

Command from Startup Sequence Step # 03- B 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% by Valve Opened AUTO CLOSE

1)

Command from Shutdown Sequence Step # 62 -D PROTECTION CLOSE

1) 2/3

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

16.4 HPH 6A FW OUTLET ISOLATING IBV AUTO OPEN

1) 2)

Command from Startup Sequence Step # 01-B HPH -6A O/L iso valve open CMD PERMISSIVE OPEN

1)

HPH -5A/6A level not high AUTO CLOSE

1) 2) 3)

Command from Startup Sequence step# 04-B HPH-5A FW I/L isolating valve open HPH-5A FW I/L isolating valve Close CMD Step # 62-F PROTECTION CLOSE

1)

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


75


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

1) 2) 3) 4)

HPH-5A/6A LVL NOT HI HPH-5A I/L isolating Valve Open AND HPH-6A O/L isolating Valve Open Turbine Not Tripped [ 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% by Valve Closed ] OR [ HPH FW 100% by valve closed AND HPH-5B FW I/L Iso. valve Opened AND HPH-6B FW O/L Iso. valve Opened AND HPH FW 50% by valve Closed ] AUTO OPEN

1)

Command from Startup Sequence Step # 10- A AUTO CLOSE

1)

Command from Shut down Sequence Step # 51- A PROTECTION CLOSE

1) 2) 3) 4) 5)

Turbine Not Tripped HPH-5A FW I/L isolating valve Closed HPH-6A FW O/L isolating valve Closed HPH FW 100% BYP valve open HPH-5A/6A level very high HPH-5A EXT STM I/L NRV AUTO OPEN

1)

Command from Startup Sequence Step # 11 HPH-5A EXT STM I/L NRV AUTO CLOSE

1)

Command from Shutdown Sequence Step # 51 HPH-5A EXT STM I/L NRV PROTECTION CLOSE

1) 2) 3) 4) 5)

Turbine Tripped HPH-5A FW I/L isolating valve not opened HPH-6A FW O/L isolating valve not opened HPH FW 100% by valve not closed HPH-5A/6A Level very high


76


1) 2) 3) 4)

HPH-5A/5B EXT STM DRN VALVE AUTO OPEN Command from HPH-5A/6A Shutdown Seq Step # 202 Command from HPH-5B/6B Start-up Seq Step # 102 Command from HPH-5B/6B Shutdown Seq Step # 202 HPH-5A EXT STM Valve Closed AND HPH-5B EXT STM Valve Closed

1) 2) 3) 4)

HPH-5A/5B EXT STM DRN VALVE AUTO CLOSE Command from HPH-5A/6A Startup Seq Step # 112 Command from HPH-5B/6B Startup Seq Step # 112 HPH-5A EXT STM Valve opened HPH-5B EXT STM Valve opened

1) 2)

HPH-5A/5B EXT STM DRN V/V PROTECTION OPEN HPH-5A/6A Level very high HPH-5B/6B Level very high

1) 2) 3)

HPH-6A EXT STM DRN VALVE AUTO OPEN Command from HPH-5A/6A Shutdown Seq Step # 201 Command from HPH-5A/6A Startup Seq Step # 101 HPH-6A EXT STM Valve

1) 2)

HPH-6A EXT STM DRN VALVE AUTO CLOSE Command from HPH-5A/6A Startup Seq Step # 112 HPH-6A EXT STM Valve opened

1)

HPH-6A EXT STM DRN V/V PROTECTION OPEN HPH-5A/6A Level very high

16.6 HPH FW 50% BY VALVE 1)

OPEN RELEASE HPH FW 50% BYP Valve I.B.V Open

1) 2)

AUTO OPEN Command from HPH Startup Seq Step # 107 Command from HPH Shutdown Seq Step # 204

1) 2)

AUTO CLOSE Command from HPH Startup Seq Step # 5- A Command from HPH Shutdown Seq Step # 06- A


77


1) 2)

1)

PROTECTION OPEN HPH-5A/6A Level > 415 mm 2/3 HPH-5B/6B Level > 415 mm 2/3 CLOSE PERMISSIVE [ 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% by Valve Opened ]

1) 2)

BYP.VALVE I.B.V AUTO OPEN Command from HPH Startup Seq Step # 06- A Command from HPH Shutdown Seq Step # 54- A

1) 2) 3) 4)

BYP.VALVE I.B.V AUTO CLOSE Command from HPH Startup Sequence Step # 08-B Command from HPH Shutdown Sequence Step # 05- B HPH FW 50% by Valve opened Command from HPH Shutdown Sequence Step # 60-B

1) 2)

BYP.VALVE I.B.V PROTECTION OPEN HPH-5A/6A Level > 415 mm HPH-5B/6B Level > 415 mm

16.7 HPH FW 100% BY VALVE 1)

CLOSE PERMISSIVE [ 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% by Valve Opened ]

1)

OPEN RELEASE HPH FW 100% BYP Valve I.B.V Open


78


1)

AUTO OPEN Command from HPH Shut down Seq Step # 58- A

1)

AUTO CLOSE Command from HPH Startup Seq Step # 09- A

1)

PROTECTION OPEN [ 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 ]

1)

BYP.VALVE I.B.V AUTO OPEN Command from HPH Shut down Seq Step # 57- A

1) 2) 3)

BYP.VALVE I.B.V AUTO CLOSE Command from HPH Startup Sequence Step # 09-A Command from HPH Shutdown Sequence Step # 59- A HPH FW 100% by Valve opened

1)

BYP.VALVE I.B.V PROTECTION OPEN [ 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 ]


79


17. DEAERATOR 1

AS TO D/A PEGGING CV BP VALVE ASV 10 PROTECTION CLOSE:

1) 2

Deaerator level very high

D/A OVERFLOW CONTROL VALVE DRV 48 AUTO OPEN

1)

Deaerator level high

PROTECTION OPEN

1)


AUTO CLOSE

1) 3

Deaerator level low

CRH TO D/A PEGGING CV BP VALVE CRHV 8 PROTECTION CLOSE:

1) 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 CLOSE

1) 2)

D/A level V High Turbine tripped


80

PROTECTIONS AND INTERLOCKS DIARY 5

D/A EXTRACTION LINE DRAIN VALVE EXV 15 AUTO OPEN

1)

Turbine tripped

AUTO CLOSE

1) 6

Extraction steam flow to D/A >10%

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% 7

Main Cond CS CV ( CD-25) I/L iso valve

Auto open: CD-25 is opened by >2% AutoClose: CD-25 is closed by <2%


81


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 guide bearing temp DE <100 degc AND Motor winding temperature < 130 degc AND Pump Reverse rotation not acted AND Switchgear not disturbed AND CWP Disch BFV closed AND If any other pump started then 60 sec over AND CW path avail

2

CW PUMP TRIP PROTECTIONS

1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 11)

EPB Operated Discharge BFV Fast Close Command PB/OWS initiated Motor thrust bearing temp very high ( > 100 degc) Motor winding temp very high ( > 130 degc) Upper Guide bearing temp NDE very high ( > 100 degc) Lower Guide bearing temp DE very high ( > 100 degc) Vibration very high (>150 mm) TD-5sec Sump Level very low (<34.7 m) 2/3 Motor Elect. Protection Operated Discharge Pressure very high (>2.2 ksc) 2/3 TD90s Disch BFV Not Open >90% within 90 sec of Pump ON CB closing

3

CW PUMP AUTO START

1) 2)

Pump Selection Standby AND Any other pump tripped Command from Pump Startup sequence Step # 4

4.

CW PUMP DISCHARGE BFV

4.1

DISCHARGE BFV NORMAL OPEN: by Solenoid S-4

1) 3)

Open Cmd from OWS AND BFV oprn selected in DCS Open Command from CW L AND Release PB at CW L pressed AND BFV Operation selected in CW L


82


4)

5) 6) 7)

Pump ON for 60 sec AND Disch BFV < Full Open for 10 sec AND Disch BFV Creep Open for 5sec Command from Pump Startup sequence Step # 5 Pump ON for 6 sec Timed reopen for 5 sec in every 2 hours

4.2

DISCHARGE BFV FAST CLOSE: by Solenoid S-2

1) 2) 4)

Command from Pump Shutdown Sequence Step # 52 Fast Cls Cmd from OWS AND BFV Oprn selected in DDCMIS Fast Close Command from CW L AND Release PB at CW L pressed AND BFV Operation selected in CW L Pump OFF AND Reverse Rotation Acted Pump Tripped Pump Not Tripped AND Pump OFF AND Discharge BFV Open >90% TD1m

5) 6) 7)

4.3

DISCHARGE BFV NORMAL CLOSE: by S-3

1) 3)

4) 5) 6)

Cls Cmd from OWS AND BFV Operations selected in DCS Close Command from CW L AND Release PB at CW L pressed AND BFV Oprn selected in CW L Pump OFF AND Pump SGC Sequence not ON Command from Pump Startup Sequence Step # 1 Command from Pump Shutdown Sequence Step # 51

4.4

DISCH. BFV SLOW (EMG LAST 10%) CLOSE: by S-5

1)

3)

Disch BFV Fast Close Cmd with 5 sec on-delay AND Disch BFV 90% clsd Disch BFV EMG close stdby Cmd 5 s off-delay AND Disch BFV 90% clsd Command from Pump Shutdown Sequence Step # 54

4.5

DISCH BFV EMG CLOSE STANDBY: by S-1

1)

Disch BFV Fast Cls cmd with 15 sec delay AND Disch BFV not 90% clsd Command from Pump Shutdown sequence Step # 53

2)

2)


83


5

CW PUMP DISCHARGE BFV OIL PUMP

5.1

START PERMISSIVES

1) 2)

Oil Level OK Nitrogen Pressure > 45 bar

5.2

PROTECTION OFF

1)

Oil Level very low

5.3

AUTO ON

1) 2)

Discharge BFV Auto OR Manual open Command Accumulator Pressure < 80 ksc

5.4

AUTO OFF

1)

Accumulator Pressure > 100 ksc


84


19. CONDENSATE TRANSFER PUMP 1

START PERMISSIVE

1) 2) 5) 6) 7) 8)

Pump OFF Suction v/v open Discharge v/v Closed Header o/l v/v open Condensate Storage tank level normal CST-1 o/l v/v open

2

TRIP PROTECTION

1) 3) 5)

Pump ON AND Discharge v/v not open TD-60 sec Suction v/v not open [CST-1 O/L v/v not open or CST lvl v low] AND P/P in auto

3

CT PUMP DISCHARGE V/V CLOSE RELEASE

1)

Pump OFF

4

CST INLET VALVE AUTO OPEN

1)

CST level low

5

CST INLET VALVE AUTO CLOSE

1)

CST level high

6 1)

CST INLET VALVE PROTECTION OPEN CST level very low


85


20. LEVEL SETTINGS 1)

DRUM LEVEL

Normal Level : 225 mm below center line Level Low : 175 mm below normal Level Lo Lo (TRIP) : 375 mm below normal Level High : 125 mm above normal Level Hi Hi (TRIP): 250 mm above normal Level adq.: 25 mm above normal 2)

HOTWELL LEVEL

Normal Level : Level Low : Level High : Level Hi Hi : 3)

DEAERATOR LEVEL


547 mm above center line 437 mm below NL 543 mm above NL 743 mm above NL

HP HEATER 5A, 5B, 6A, 6B LEVEL


476 mm above center line 250 mm below NL 100 mm above NL 150 mm above NL

525 mm below center line 80 mm below NL 135 mm above NL 415 mm above NL

LPH 1 LEVEL

Normal Level : Level Low : Level High : Level Hi Hi :



86

PROTECTIONS AND INTERLOCKS DIARY 6)

LPH 2 LEVEL


LPH 3 LEVEL



ECW OH Tank level (SG + TG)

Normal Level : Level Low : Level Lo Lo : Level High : Level Hi Hi : 9)


460 mm below GC 600 mm below NWL 775 mm below NWL 520 mm above NWL 570 mm above NWL

CST level

Level Low : Level Lo Lo : Level Normal : Level Hi Hi :

3000 mm above ground 2000 mm above ground 10100 mm above ground 9100 mm above ground

Note: CST zero meter is 1000 mm above the ground !


87


NOTES:


88

Protection And Interlock-ntpc 5g6da

Overview 26281t

More details 6y5l6z

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