SWBPPermissive:

Disch v/v closedSuction Pressure > 0.5 kg/cm2Atleast minimum time elapsed after starting of last SWBP

ACW P/P Permissive:

L/O relay resetDisch v/v closedLevel in O/H tank > 1.7 MAtleast minimum time elapsed after starting of last P/P

Trip: L/O relay operatedEmergency switch operated

Auto startACW P/P on auto & Runninig ACW P/P trip &Dischrge header pressure Lo &Atleast minimum time elapsed after starting of last P/P

Air CompressorTrip:

LO pressure LowLP stage 1 or 2 dischrge air temp. HiHP stage dischrge air temp. HiMotor O/LBreaker protection operated ( Inst. O/C, O/C with time delay

Remark:Stn air to Inst. Air CV air fail- OpnInst. Air Hdr pr.CV maintains 0.3bar dp.& Air fail- Close

Air DrierTrip:

Lack of oilRefrigerent high pressureRefrigerent low pressureHigh current

HMPAuto start:

Runninig HMP trip CEPPermissive:

Suction V/V openHW Lvl OK ( -50 mm)Seal water pr. OK ( 3 bar)Dischrge V/V closed or Hdr pr. > 8 barL/O relay reset

Trip: L/O relay operatedEmergency stop switch operateddp strainer Hi ( > 0.6 bar) - Not i/sLocked rotor current trip = 6 * FLC

Any HMP running for > 5 sec & hdr pr. ≤ 3 bar

Instan. O/C trip = 10*FLCTime O/C trip = 1.2*FLCMinimum R/C flow = 100 Kg/s, Max flow through R/C = 166.7 kg/s

Auto start:CEP auto ONCEP trip or dischrge Hdr pr. < 18 bar

CEP disch. v/v opening permissive:Dischrge hdr pr. > 8 bar

CEP suction. v/v closing permissive:5 sec elapsed after CEP stopping

Heater drip pumpPermissive:

Seal water pr OKDrain receiver lvl not loLockout relay reset

Trip: Emergency stop switch operatedDrain receiver lvl loLockout relay operated.Winding temp high 120 degLocked rotor current trip = 6 * FLCInst O/C trip = 10 * FLCTime O/C trip = 120%FLC

MBFPPermissive:

Lub oil pressure > 0.8 barLub oil tank level > 50%Minimum flow 100% openWarm up valve closedNo reverse rotationLockout relay resetDea lvl OkUp stream isolating valve of 25% & 100% CV closed or disc hdr pr OKcooling water flow OKSuction V/V open(Any one STBFP trip & MBFP on auto S/B ) or barrel top & bottom differential temp < 30 deg with control ckt 3 off

Trip: MBFP running & LO Pr < 0.5 bar for 1 secMBFP running & flow lo lo Pr < 0.5 bar for 10 secMBFP running & W/U valve not closedReverse rotationlockout operateddea lvl lo loshaft disp > 1.5mmBP or MP S/S DP > 0.6 bar for 15 secSuction V/V not open2/3 FW hdr pr hi-hi both temp of radial brg left or right HHboth temp of Axial brg left or right HHEmergency trip switch operated.

MBFP Auto S/B ON results in opening of isolating valves of 100% & 25% CV & AC oil pump auto start

MBFP Auto S/B ON results in opening of isolating valves of 100% & 25% CV & AC oil pump auto start

MBFP auto S/B put off under following conditions 1) Discharge hdr pressure low or MBFP trip criteria presentMBFP LO systemPermissive for AC LOP:

Lvl in oil tank OKCriteria for auto starting of LOPs

Criteria for auto starting of LOPs on protection

MBFP reverse rotation starts AOP & EOP both & LOPs on auto & lub oil pressure < 0.7 bar starts EOPPermissive for stopping AC LOP

MBFP stopped or oil pump on auto + MBFP running for more than 46 sec + lub oil Pr > 3 barPermissive for stopping DC LOP

MBFP stopped or AC oil P/P running & LO Pressure > 0.8 barCriteria for auto stopping of AC LOP

MBFP LOP on auto & LO Pr > 3 bar & MBFP running for 40 SecCriteria for auto stopping of AC LOP

STBFPPermissive:

1 Disch v/v & its B/P v/v closed2 Suction v/v open3 deaerator lvlv ok4 No reverse rotation5 W/U cv closed6 temp differential of barrel top & bottom < 30 deg7 W/U control off8 R/C V/V full open9 Lub oil pr > 0.8 bar

Trip: 1 Pump Trip Criteria2 Shaft displacement > max (1.5mm)3 Suction v/v not 100% open4 Dearator lvl lo lo (-585 mm)5 reverse rotation6 Turbine reset & W/U v/v not closed7 MP or BP S/S Dp > 0.6 bar for 10 sec8 Emergency trip switch operated.9 R/C V/V not 100% open & flow < min for 10 sec

10 Turbine reset & lub oil pressure < 0.5 bar for 1 sec11 Radia brg or axial brg temp hi-hi (90 deg)12 FW hdr pr hi hi ( not in service)13 Turbine trip Criteria14 Control oil pr low (2.5 bar)15 Gov oil pressure low for 10 sec (4 bar)16 LO pr very low (1 bar)17 exhaust temp very hi (140 degC)18 O/S mech & elect (6174 rpm)

MBFP auto S/B On & LO Pr < 1 bar or MBFP stopped or MBFP startup programme step 1 for starting or AC oil pump on auto & LO Pr < 1 bar for 2 Sec

MBFP LOPs on auto & LO Pr ≥ 3 bar

19 Emergency trip switch operated.20 remote trip21 BFP fault & BFP fault not bypassed22 Axial shift hi (0.7mm)23 Vacuum lo lo (0.5)

*

*Auto starting of S/B AOP

BFP turbine running & running AOP trips or BFP reverse rotation & LO pressure low Or Lub oil pressure low.AOP stopping criteria

DC JOP interlockJOP switch on auto & turb speed < 500 rpmTG Interlock for auto openTG on auto & Turb speed < 100 rpm & LO pr OK & JO Pr > 55 bar

TG Interlock for manual open

TG V/V on manual & LO Pr OK & JO Pr OK & open command given from local panel.Engage / disengage coupling interlock

JO pr OK & Engage / disengage switch in engage position & Lub oil pr OK & turbine speed = zero & coupling not engagedCriteria for disengaging

Turbine trip & engage/disengage switch in disengage condition & coupling not disengage & speed < 100 rpmExhaust valve

Vacuum PumpPermissive:

1 solenoid v/v closed &2 inlet v/v closed & 3 other vacuum p/p startup sequence not in progress &4 air water seperatoe tank lvl normal &

5A

5B

Vacuum bkr

HPLP BP High speed TCV protection close criteria

1) MFT or 2) Water injection pr low or 3) Down stream temp hiNormal speed TCV protection close criteria

STBFP suction v/v opening permissive, its B/P v/v open & STBFP speed is 0 rpm.STBFP reverse rotation results in closing of following v/vs 25% CV isolating v/vs ( up & down stream), 100% disch v/v its B/P v/v & booster stage isolating v/v

Other AOP running & turbine speed > zero & stop command from UCP or field OR turbine speed is zero & stop command given

closing interlock: Closes if local switch is on auto & turbine is in tripped condition or closes when close command is given from local/UCB panel provided turbine is in tripped condition

For pump start command from UCP 1) respective p/p switch on remote (at local cabinet) 2) Holding selection off (UCB), 3) Vacuum p/p ON command from UCB

For local starting. 1) bypass, inlet v/v opening & circulation p/p starting is done from respective switchgear modules & pump switch in local cabinet tobe put on 'Local' selection & local start/stop to be given

Opens when 1) Fire protection operated 2) When vacuum bkr partial open command is given from CR , vacuum bkr opens first & then closes when condenser pr ≥ 0.88 bar

High speed TCV protection open criteria1) Generator trip or 2) Turbine trip or 3) Load shedding relay operated

Normal speed TCV protection open criteria

Above 1 or 2 or 3 or 4) Manual open commad for TCV (HS) valve & HS TCV <15% openBlock the open criteria(TCV):

1) TCV (HS) > 15% & 2) Protection or manual open command for TCV (HS)High speed PCV protection close criteria

1) MFT or 2) Water injection pr low or 3)Downstream temp hi Normal speed PCV protection close criteria

Any condition for PCV(HS) closing & PCV (HS) almost close.High speed PCV protection open criteria

Normal speed PCV protection open criteriaAny condition for PCV(HS) opening & PCV (HS) open> 95%

Block the open criteria PCV (HS)

Block the open criteria PCV ( Normal Speed)

Any condition for PCV (HS) opening or closing present & it is not opened or closed respectively.

Above 1 or 2 or 3 or 4) Manual close commad from HS valve & HS v/v ≤ 15% open

1) gen trip or 2) turb trip or 3)load shedding relay operation, 4) Actual steam Pr > set point & any of PCV block open condition not present.

1) TCV ≤ 15% open & PCV (HS) close

SWBPPermissive:

Disch v/v closedSuction Pressure > 0.5 kg/cm2Atleast minimum time elapsed after starting of last SWBP

ACW P/P Permissive:

L/O relay resetDisch v/v closedLevel in O/H tank > 1.7 MAtleast minimum time elapsed after starting of last P/P

Trip: L/O relay operatedEmergency switch operated

Auto startACW P/P on auto & Runninig ACW P/P trip &Dischrge header pressure Lo &Atleast minimum time elapsed after starting of last P/P

Air CompressorTrip:

LO pressure LowLP stage 1 or 2 dischrge air temp. HiHP stage dischrge air temp. HiMotor O/LBreaker protection operated ( Inst. O/C, O/C with time delay

Remark:Stn air to Inst. Air CV air fail- OpnInst. Air Hdr pr.CV maintains 0.3bar dp.& Air fail- Close

Air DrierTrip:

Lack of oilRefrigerent high pressureRefrigerent low pressureHigh current

HMPAuto start:

Runninig HMP trip CEP

Suction V/V openHW Lvl OK ( -50 mm)Seal water pr. OK ( 3 bar)Dischrge V/V closed or Hdr pr. > 8 barL/O relay reset

Trip: L/O relay operatedEmergency stop switch operateddp strainer Hi ( > 0.6 bar) - Not i/sLocked rotor current trip = 6 * FLC

Instan. O/C trip = 10*FLCTime O/C trip = 1.2*FLCMinimum R/C flow = 100 Kg/s, Max flow through R/C = 166.7 kg/s

Auto start:CEP auto ONCEP trip or dischrge Hdr pr. < 18 bar

CEP disch. v/v opening permissive:Dischrge hdr pr. > 8 bar

CEP suction. v/v closing permissive:5 sec elapsed after CEP stopping

Heater drip pumpPermissive:

Seal water pr OKDrain receiver lvl not loLockout relay reset

Trip: Emergency stop switch operatedDrain receiver lvl loLockout relay operated.Winding temp high 120 degLocked rotor current trip = 6 * FLCInst O/C trip = 10 * FLCTime O/C trip = 120%FLC

MBFPPermissive:

Lub oil pressure > 0.8 barLub oil tank level > 50%Minimum flow 100% openWarm up valve closedNo reverse rotationLockout relay resetDea lvl OkUp stream isolating valve of 25% & 100% CV closed or disc hdr pr OKcooling water flow OKSuction V/V open(Any one STBFP trip & MBFP on auto S/B ) or barrel top & bottom differential temp < 30 deg with control ckt 3 off

Trip: MBFP running & LO Pr < 0.5 bar for 1 secMBFP running & flow lo lo Pr < 0.5 bar for 10 secMBFP running & W/U valve not closedReverse rotationlockout operateddea lvl lo loshaft disp > 1.5mmBP or MP S/S DP > 0.6 bar for 15 secSuction V/V not open2/3 FW hdr pr hi-hi both temp of radial brg left or right HHboth temp of Axial brg left or right HHEmergency trip switch operated.

MBFP Auto S/B ON results in opening of isolating valves of 100% & 25% CV & AC oil pump auto start

MBFP Auto S/B ON results in opening of isolating valves of 100% & 25% CV & AC oil pump auto start

MBFP auto S/B put off under following conditions 1) Discharge hdr pressure low or MBFP trip criteria presentMBFP LO systemPermissive for AC LOP:

Lvl in oil tank OKCriteria for auto starting of LOPs

Criteria for auto starting of LOPs on protection

MBFP reverse rotation starts AOP & EOP both & LOPs on auto & lub oil pressure < 0.7 bar starts EOPPermissive for stopping AC LOP

MBFP stopped or oil pump on auto + MBFP running for more than 46 sec + lub oil Pr > 3 barPermissive for stopping DC LOP

MBFP stopped or AC oil P/P running & LO Pressure > 0.8 barCriteria for auto stopping of AC LOP

MBFP LOP on auto & LO Pr > 3 bar & MBFP running for 40 SecCriteria for auto stopping of AC LOP

STBFPPermissive:

Disch v/v & its B/P v/v closedSuction v/v opendeaerator lvlv okNo reverse rotationW/U cv closedtemp differential of barrel top & bottom < 30 degW/U control offR/C V/V full openLub oil pr > 0.8 bar

Trip: Pump Trip CriteriaShaft displacement > max (1.5mm)Suction v/v not 100% openDearator lvl lo lo (-585 mm)reverse rotationTurbine reset & W/U v/v not closedMP or BP S/S Dp > 0.6 bar for 10 secEmergency trip switch operated.R/C V/V not 100% open & flow < min for 10 secTurbine reset & lub oil pressure < 0.5 bar for 1 secRadia brg or axial brg temp hi-hi (90 deg)FW hdr pr hi hi ( not in service)Turbine trip CriteriaControl oil pr low (2.5 bar)Gov oil pressure low for 10 sec (4 bar)LO pr very low (1 bar)exhaust temp very hi (140 degC)O/S mech & elect (6174 rpm)

MBFP auto S/B On & LO Pr < 1 bar or MBFP stopped or MBFP startup programme step 1 for starting or AC oil pump on

Emergency trip switch operated.remote tripBFP fault & BFP fault not bypassedAxial shift hi (0.7mm)Vacuum lo lo (0.5)

Auto starting of S/B AOP

BFP turbine running & running AOP trips or BFP reverse rotation & LO pressure low Or Lub oil pressure low.AOP stopping criteria

DC JOP interlockJOP switch on auto & turb speed < 500 rpmTG Interlock for auto openTG on auto & Turb speed < 100 rpm & LO pr OK & JO Pr > 55 bar

TG Interlock for manual open

TG V/V on manual & LO Pr OK & JO Pr OK & open command given from local panel.Engage / disengage coupling interlock

JO pr OK & Engage / disengage switch in engage position & Lub oil pr OK & turbine speed = zero & coupling not engagedCriteria for disengaging

Turbine trip & engage/disengage switch in disengage condition & coupling not disengage & speed < 100 rpmExhaust valve

Vacuum PumpPermissive:

solenoid v/v closed &inlet v/v closed & other vacuum p/p startup sequence not in progress &air water seperatoe tank lvl normal &

Vacuum bkr

HPLP BP High speed TCV protection close criteria

1) MFT or 2) Water injection pr low or 3) Down stream temp hiNormal speed TCV protection close criteria

STBFP suction v/v opening permissive, its B/P v/v open & STBFP speed is 0 rpm.STBFP reverse rotation results in closing of following v/vs 25% CV isolating v/vs ( up & down stream), 100% disch v/v

Other AOP running & turbine speed > zero & stop command from UCP or field OR turbine speed is zero & stop command

closing interlock: Closes if local switch is on auto & turbine is in tripped condition or closes when close command is given

For pump start command from UCP 1) respective p/p switch on remote (at local cabinet) 2) Holding selection off (UCB), 3) Vacuum p/p ON command from UCB

For local starting. 1) bypass, inlet v/v opening & circulation p/p starting is done from respective switchgear modules & pump switch in local cabinet tobe put on 'Local' selection & local start/stop to be given

Opens when 1) Fire protection operated 2) When vacuum bkr partial open command is given from CR , vacuum bkr opens

High speed TCV protection open criteria1) Generator trip or 2) Turbine trip or 3) Load shedding relay operated

Normal speed TCV protection open criteria

Above 1 or 2 or 3 or 4) Manual open commad for TCV (HS) valve & HS TCV <15% openBlock the open criteria(TCV):

1) TCV (HS) > 15% & 2) Protection or manual open command for TCV (HS)High speed PCV protection close criteria

1) MFT or 2) Water injection pr low or 3)Downstream temp hi Normal speed PCV protection close criteria

Any condition for PCV(HS) closing & PCV (HS) almost close.High speed PCV protection open criteria

Normal speed PCV protection open criteriaAny condition for PCV(HS) opening & PCV (HS) open> 95%

Block the open criteria PCV (HS)

Block the open criteria PCV ( Normal Speed)

Any condition for PCV (HS) opening or closing present & it is not opened or closed respectively.

Above 1 or 2 or 3 or 4) Manual close commad from HS valve & HS v/v ≤ 15% open

1) gen trip or 2) turb trip or 3)load shedding relay operation, 4) Actual steam Pr > set point & any of PCV block open

Normal Lo Lo-lo Hi Hi-hi Remark1 ACW tank : 48 M3

3.8 M 1.7 M 1.3 M 4.1 M ALARMSMakeup opens at 1.7 M & closes at 3.8 MMakeup valve air fail - openACW O/H tank level MCV max flow 20 kg/s

2 Raw water tank : 5100 M34.17 M 0.5 M -1.04 4.37 M 4.57 M ( O/F) ALARMS

Reserve for fire fighting 1500 M33 CST 5A: 600M3/Dia 8.5M/Ht 11M 5B: 460M3/Dia 7.5M/Ht 11M

5.5 9.3 ALARMS4 DM Storage tank 1290 M3 each ( three Nos.)5 Hot Well: 77M3 L*B*H = 14.7*2.2*1.4 M

0-150 mm -200 200 ALARMSCEP start permissive = -50 mmHW mkup CV air fail - locked.

6 Deaerator: 200M3 at normal level ( 6min capacity at VWO)0 - 200 mm -200 -585 200 BFP TRIP AT -585

7 MBFP oil tank : 1.87 M360% Start perm = 50%

Normal Lo Lo-lo Hi Hi-hiAir CompressorOil pressure

2.7 1.2

air temp to cooler 110-135 185Stn air to Inst. Air CV air fail- OpnInst. Air Hdr pr.CV maintains 0.3bar dp.& Air fail- Close

CEPCooling water flow 10 5.5 6.5disc Pr 27 bar 22 barBrg temp 42-43 deg 75 degwdg temp 50-64 deg 110 deg 120 deg

Locked rotor current trip = 6 * FLCInstan. O/C trip = 10*FLCTime O/C trip = 1.2*FLCMinimum R/C flow = 100 Kg/s, Max flow through R/C = 166.7 kg/sCEP min R/C air fail - open.

strainer Dp 600 mmwc

Seal water Pr 27 - 29 barHtr drp Pump

Wdg temp hi trip at 120 degMBFP

LO pressure 2.8 1.6 (A)LO temp 40 70 (A) LO Filter Dp 0.2 0.6 (A)P/P Flow 225 98 (A) 44

Booster PP Pr 15 bar 10 bar (A)P/P Disc Pr 251 bar 274

P/P disc Temp 163 degC 180 (A)BCL flow 2 kg/s 4BCL Pr 13.5 barBP & MP S/S DP < 0.1 1 1

Dea lvl -200 -585 200seal water pr 24 bar 20 (A) 18

seal water O/L temp 80

P/P to Dea suct DT 5 to 10 30LO tank Lvl 60% 50%Th brg temp 55-70 75 90

53-58 75 90

50-55 75 90

1.2 (TD-11Sec)

800 mmwc

0.5 (T with TD 1 sec))

0 - 200 mm

54 - 60 degC

Motor radial brg tempStep up gear brg temp

motor / pp brg vib 1.3 - 7 8 mm/sAxial disp 0.5 1.5 (T)Motor wdg temp < 100 110 120 (T)Mtr core temp 80 90 95

21 m3/s 20

Mtr cool air I/L temp 42 57 62

68 90 95lub oil sump temp 70

4.5 * FLC

Locked rotor current 5*FLCInst Current 10*FLCTime O/C 1.2*FLCMotor differentialSTBFP

LO pressure kg/cm2 2.2 1.6(A)Govn oil 7.5 4 (T)Control oil 7.5 2.5Lub oil filt DP bar 0.2 0.6(A)

2 5

2 15Lub oil sump temp 53 73AOP / JOP disc Pr 70 barcasing temp 270- 290Exhausthood temp 49 110 140

0.5 kg/cm2vacuum 0.92 0.6 0.5 (T)axial shift 0.013 -0.075 0.5 0.7O/S 6174Casing expansion 3.3 15 mm

0 - 0.4 25eccentricity micron 40 100pedestal vibration 4 50shaft vibration 20 50Brg temp 60 - 65 75

Loss of 24V dc results in BFPTD tripLoss of 220V DC results trip circuit becomes ineffective

BCl flow 7 16shaft displacement 1 1.5mm

Vacuum

Mtr cooling water flow

Mtr cool air O/L temp

Motor starting current

P/P 0.5 (T) turb 1 (T)

control oil filt Dp MWCGovn oil filt Dp MWC

Exhaust releif diaphragh setting

differential expansion

> 0.9 0.885bar 0.7(T)HPBPDown stream temp 320 400spray water pressureLPBPVacuum 0.9 0.4steam temp after LP 50 90spray water pressure 23 8.5steam pressure after 0.14

Remark

TRIP

AlarmStn air to Inst. Air CV air fail- OpnInst. Air Hdr pr.CV maintains 0.3bar dp.& Air fail- Close

AlarmAlarm/ 18 bar S/b p/p cuts inAlarmAlarm./ Trip

Locked rotor current trip = 6 * FLCInstan. O/C trip = 10*FLCTime O/C trip = 1.2*FLCMinimum R/C flow = 100 Kg/s, Max flow through R/C = 166.7 kg/sCEP min R/C air fail - open.

Alarm

Start permit at 3 bar

Wdg temp hi trip at 120 deg

Trip with TD of 10 sec

trip with TD of 10 sec

ECIP cuts in at 18 bar

alarm

Start permit at 50%trip

trip

trip

AOP/EOP start = 1/0.7, AOP auto off = 3, start perm = 0.8

Auto S/B off at ≤ 60 bar, Disch valve closes at 85 bar

BFP trip at -585 mm, start perm: 200mm

W/U valve opens at Dt > 30 degC at load < 400 MW

alarmtriptriptrip

trip

tripalarm

triptriptripyes

trip , AOP start: 6.5triptrip

alarm

alarmalarm

trip

triptriptripAlarm

AlarmAlarmAlarmAlarmAlarm

Loss of 24V dc results in BFPTD tripLoss of 220V DC results trip circuit becomes ineffective

alarmtrip

Vacuum

Start perm (for P/P: 0.8 bar, for turn gear:1 bar), EOP cut in: 1 bar

trip S/B Vac P/P cuts in at -0.83 bar

Protection closeopen permissive at 12 bar

protection close

open permissive 9.9 bar

Equipment Motor RPM Capacity Head FL current Norm currentDM transfer P/P ( 3 Nos.) 15 HP/415V 2900 20 M3/hr 30 MWCHMP 26 KW/415V 2935 66 M3/hr 5 Kg/cm2 45Boiler Fill P/P 110 KW/415V 2970 180 M3/hr 10 Kg/cm2 172Boiler Wash P/P 90 KW/415V 2960 120 M3/hr 100 M 165CEP 800 KW/6.6KV 1485 210 Kg/sec 252 MLC 88 70Heater drip P/P 250 Kw / 6.6 KV 1486 230 M3/H 195.5 - 220 27.3 22MBFP 9 MW / 6.6 KV 1486 915

MBFP equally spaced start ( 20 - 30 min gap) : 3No of starts in quick succession with cold machine at room temp: 3Hot restart ( Admissible if motor stopped under normal condition): 2Start per 24 Hrs : 3

ECIP 70 KW/220DC 3000 49-69 T/H 250-230 M 375 ampcondensate sump pump 18.5 KW 1460 81M3/H 22 M 34 Amp Vacuum pump 34NM3/H

Remark

Capability= 252 MWNPSH 2.2

cuts in at 18 bar hdr pr

HTR 1 HTR 2 HTR 3 HTR 5Pressure upper limit ( not more than 12 hrs/year) (bar) 0.46 1.8 3.6 22.3Temperature upper limit ( without time limit) 90 171 224 444

135 211 268 479

Design pressure (bar)Tube 35 35 35 280Shell 3.5 3.5 3.5 21

Temperature degCTube 160 160 220 247Shell 160 160 220 227

TTD in degC 3 2.9 0.3DCA in degC 5.9 5.6 5.3

safety valve settingTube 35 35 280Shell 3.52 3.52 21.13

Upper limit for extraction pressure of heater 6 ( without time bar) is 44.8 barIn special cases at no load Htr 6 steam temperature may go upto 500 deg

Feed water induction control Feed water bypassing criteria

A When FW htr shell level goes hi-hi the heater gets bypassed as follows1 Extraction valve closes in test off condition.2

B

Water induction test1 Key switch ON &

& 2

& 3 Extraction line drain pots (before & after NRV) level not hi for heater to be tested.& 4 Test off for all other extraction.& 5 Test ON push button pressed for the heater to be tested with manual release.

Criteria for putting test off1 Turbine trip

or 2 Manual rel & key switch operated + push button test off when level is not high.or 3 Htr lvl not hi & test time exceeded during test

Extraction valve test

Feed water valve test

Temperature upper limit ( 80hrs/annum), Max 15 min in individual case in degC

FW bypass valve opens & after reaching 90% open condition inlet & outlet valves close provided test is off & FW selector is on auto. Feed water side is bypassed as given above in (2) When bypass push button is pressed alog with release button.

*Htr lvl not hi ( for htr 2, 3, 5, 6), *Drain receiver level not hi & condensate valve selection on auto ( for htr 1), *Extraction line diff pressure > Min (for deaerator & BFP)

With heater test ON & extraction isolating valve selected for test , test programme starts closing the extraction valve till it is 75% open & then reopens full

With heater test on & feed water valve selector on auto , test programme starts opening FW bypass valve on Hi-Hi lvl (simulated) and after its reaching 25% open position starts closing FW inlet , outlet to 75% open position & on successful operation restores back inlet, outlet valves to full open & then bypass to close position.

HTR 651.9356

422280

492952750.15.9

28049.08

STBFPSTBFP minimum speed 1180 rpmcoasting down after tripping from full load with vacuum 25 mincritical speed: 7550 rpmNormal O/P with steam flow 11.43 kg/s 6038KWMax O/P 8500 KWNormal speed 5556 rpmMax speed 5940 rpmspeed range 1180 - 5940 rpmEHC operating range 1120 - 6160 rpmMHC operationg range 2800 - 6160 rpm

Pressurespecified initial steam pr: 7.067 kg/cm2Permissible deviation at no load operation: 7.42 kg/cm2

Turb exhaust pr.: 0.122 kg/cm2

Primary oil vs speedspeed 4000 4500 5000 5500 6000 6075 6300 6400Primary oil 1 1.3 1.58 1.96 2.25 2.38 2.48 2.55

Permissible deviation instaneously for a total duration of 12 hrs p. a.: 8.4 kg/cm2

Vacuum bkr 220DC swgr PNL 10 FDR 3HPBP cabinet( CUA20)

power supply source 1 SSS A/R3-7B power supply source 2 USS B/F27A

LPBP 2nd stage solenoid 220V DC/PNL 10 FDR 4LPBP spray hdr vent v/v solenoid 220 V DC / PNL10-FDR 5