SWBP Permissive: Disch v/v closed Suction Pressure > 0.5 kg/cm2 Atleast minimum time elapsed after starting of last SWBP ACW P/P Permissive: L/O relay reset Disch v/v closed Level in O/H tank > 1.7 M Atleast minimum time elapsed after starting of last P/P Trip: L/O relay operated Emergency switch operated Auto start ACW P/P on auto & Runninig ACW P/P trip & Dischrge header pressure Lo & Atleast minimum time elapsed after starting of last P/P Air Compressor Trip: LO pressure Low LP stage 1 or 2 dischrge air temp. Hi HP stage dischrge air temp. Hi Motor O/L Breaker protection operated ( Inst. O/C, O/C with time del Remark: Stn air to Inst. Air CV air fail- Opn Inst. Air Hdr pr.CV maintains 0.3bar dp.& Air fail- Close Air Drier Trip: Lack of oil Refrigerent high pressure Refrigerent low pressure High current HMP Auto start: Runninig HMP trip CEP Permissive: Suction V/V open HW Lvl OK ( -50 mm) Seal water pr. OK ( 3 bar) Dischrge V/V closed or Hdr pr. > 8 bar L/O relay reset Trip: L/O relay operated Emergency stop switch operated dp strainer Hi ( > 0.6 bar) - Not i/s Locked rotor current trip = 6 * FLC Any HMP running for > 5 sec & hdr pr. ≤ 3 bar
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
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
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
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
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
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