Functional Description Alrar

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CLIENTE – CUSTOMER SONATRACH

FIRENZE LOCALITA' - PLANT LOCATION ALGERIA

COMMESSA - JOB

1705713-14-15

IMPIANTO – PLANT

ALRAR POWER PLANT EXTENSION PROJECT

TITOLO - TITLE

CONTROL SYSTEM

FUNCTIONAL DESCRIPTION

AS-SHIPPED 4 REVISED SH. 1, 6 , 8, 15 ,16, 50 ,55 , 56, 57 FOR AS-SHIPPED RADHIKA J. 15/03/10

3 REVISED FOR AS-SHIPPED RADHIKA J. GIOVANARDI L.. SEGHI A. 24/12/09 ITEM

2 GENERAL REVISION RADHIKA J. LUSINI S. SEGHI A. 12/11/09

1 GENERAL REVISION RADHIKA J. LUSINI S. SEGHI A. 08/07/09

_{N. SOM5461188 /4}

ISSUE PRITAM P. ORGERO F. SEGHI A. 30/04/09 LINGUA-LANG. PAGINA-SHEET

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3 REVISED WHERE SHOWN AS <3>

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3.14 FIRE FIGHTING AND GAS DETECTION MONITORING 49

3.15 GENERATOR HEATER AND COOLING FANS SYSTEM 50

3.16 GENERATOR SYNCHRONIZATION SEQUENCES 51

3.17 DROOP AND ISOCHRONOUS CONTROL MODE 53

3.18 BASE LOAD 55

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LIST OF ABBREVIATIONS:

NOTE:

The scope of this specification is to give a flow chart description of the main gas turbine sequences and a functional description of its auxiliaries sequences.

This document does not cover the description of CORE ENGINE LOGIC FUNCTIONS.

The CORE ENGINE LOGIC FUNCTIONS software section contains algorithms for combustion chambers flame detection, firing temperature calculation, speed/load regulator/protection, acceleration regulators, exhaust temperature averaging regulator and protection, inter stage pressure regulator. These algorithms shall be considered GE proprietary information and are excluded from this specification.

Reference Documents <2> P&Ids SOM5105800 SOM5105801 SOM5105810 SOM5105820 SOM5105821 SOM5105830 SOM5105831 SOM5105832 SOM5105834 SOM5105836 SOM5105840 SOM5105871 SOM5105880 SOM5105881 SOM5105890 SOM5105894

UCS I/O LIST : SOM5461006

MKVIe MARK VIe

DCP DIRECT CURRENT PANEL

MCC MOTOR CONTROL CENTER

QMT MEDIUM VOLTAGE PANEL

PMS POWER MANGEMENT SYSTEM

F&G FIRE AND GAS

DCS DISTRIBUTED CONTROL SYSTEM

UCP UNIT CONTROL PANEL

GCPP GENERATOR CONTROL AND PROTECTION PANEL

GEP GENERATOR EXCITATION PANEL

GT GAS TURBINE

CRS CUSTOMER READY TO START<2>

HMI HUMAN MACHINE INTERFACE <2>

ARS AUXILLIARY READY TO START <2>

PRS PROCESS READY TO START <2>

FSNL FULL SPEED NO LOAD <2>

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START/STOP SEQUENCING

1.1 READY TO START

Start Sequence F H from Shutdown sequence from Trip sequence GT zero speed detected? Aux. permissive OK? Unit Ready to Start (L3RS=1 (2)) Core and diagnosti c OK? A Shutdown or Trip active ?

Turbine and Auxiliaries Sequences Master Selector(1) - Crank -Fire - Manual -Auto - Remote - Off No Yes Yes (L3ARS (2)) Yes

Auxiliaries ready to start (L3ARS) includes the

following software Cumulative signals No No Yes No Process Sequences External Sequences AND (1) HMI Software switch SHT 6 SHT 10 SHT 13 Engine NOTES: - Miscellaneous (L3ARS_MSC) - Lube Oil(L3ARS_LO) - Hydraulic Ratchet (L3ARS_RAT) -Enclosure Vent (L3ARS_ENC) -Fire&Gas monitor (L3ARS_FGM ) - Fuel gas(L3ARS_FG) OR Water wash on Selected (L43BW) See 2.1 “AUXILIARIES START READY” for

details Process ready To start -AND 3 CRS(2) =1 L3PRS Customer ready to start

XS-120 (from DCS)

(2) Internal Software Signal

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1.2 AUXILIARIES STARTING

Turbine start sequence initiated- Start auxiliaries (L1X= 1(3))

Mineral Lube Oil system

activated (1)

Auxiliarie s Start Passed?

Master protective signal

enabled (L4= 1(3) ) Yes A Yes Ventilation System activated B

Auxiliaries Start Passed (L3ASP) includesthe

following software cumulative signals

:

-Lube Oil(L3ASP_ LO) Ventilation(L3ASP_ENC ) See 2.2 “START PASSED” for details.

N o

NOTES

(1) Can be already activated (seecooldown sequence )

(2) HMI software switch .

Turbine and Auxiliaries Sequences External

Sequences SequencesProcess

SHT 5

SHT 7

Oil mist eliminator started

Remote Manual

No

Yes Yes

Start Command

XS-116 ( From DCS) Button on_HMI?

Start Push Master Sel

And

(3) Internal Software

Signal <3> Open Fuel Block Valve20FB-2(SOV01002B) Close Fuel vent Valve 20FV-1(SOV01001A ) Close Fuel vent Valve 20FV-2(SOV01001B)

<4>

Figure 2 - Auxiliaries starting

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1.3 CRANK

Figure 3 –Crank

Off-line water wash sel.

on HMI B

Water Wash system Start (1)

Turbine and Auxiliaries Sequences External Sequences Process Sequences End of sequence NOTES: (1) Note that if water wash is selected, ready to start and start passed conditions change from the above described Aux. Ready to crank? GTspeed above Crank speed? -Ratchet system activation -Starting system activation

Yes CRANK C GT speed above zero speed? No

Ratchet system de-activation Yes Crank Time Elapsed? No Yes Yes

Auxiliaries Ready to crank (L3ARC) includes the following software cumulative signals: -Process (L3PRC) -Lube Oil (L3ARC_LO) -Fuel Gas (L3ARC_FG) See 2.3 “CRANK READY” for details No Yes No SHT 6 SHT 8 No

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1.4 IGNITION AND WARMUP

C I g n itio n T ra s f o rm e r c o m m a n d( L 2 T V X = 1 ( 3 )) O p e n F u e l g a s B lo c k v a lv e s 2 0 F G - 1 ( F V - 3 3 7 ) & 2 0 F G - 2 ( F V - 3 3 8) F la m e D e t e c t e d ( L 2 8 F D X) ? Y e s - L u b e O il C o o lin g s y s te m a c t iv a t io n W A R M U P W a r m u p t im e e la p s e d? D Y e s T u r b in e a n d A u x ilia r ie s S e q u e n c e s E x te r n a l S e q u e n c e s P r o c e s s S e q u e n c e s A u x_{.re a d y to} fir e ?

A u x ilia rie s R e a d y to f ire ( L 3 A R F) I n c lu d e s th e f o llo w in g s o f tw a re c u m u la tiv e s ig n a ls: - H y d ra u lic O il( L 3 A R F_ H Y D) - F u e l G a s( L 3 A R F_ F G ) - W a t e r W a s h( L 3 A R F_ W W ) S e e2 . 4 “ F IR E R E A D Y ” f o r d e t a ils. N o Y e s C o re E n g in e re a d y t o f ire? N o Y e s F irin g tim e e la p s e d? N o N o M a s t e r S e le c t o r( 2 ) Y e s G T o S h u t d o w n s e q u e n c e -D is a b le ig n it io n t ra n s fo rm e r -E n d ( 1 ) N o - R e m o t e - F ire - M a n u a l - A u to N O T E S: ( 1 ) T u rb in e re m a in s in C R A N K m o d e. T o s t a rt a n e w f irin g a t te m p t, t h e o p e ra to r h a s t o m o v e t e m p o ra rily m a s t e r s e le c t o r in C R A N K p o s itio n ( 2 ) H M I s o f tw a re s w it c h. M a s te r s e le c to r_{( 2 )} C ra n k - F ire - M a n u a l - A u t o - R e m o t e S H T 7 S H T 9 S H T 1 5 O n S k id V a lv e s C lo a e F u e l g a s V e n t v a lv e s 2 0 V G - 1 ( F V - 1 0 9) O n S k id V a lv e s O p e n F u e l g a s B lo c k v a lv e s 2 0 F G - 1 ( F V - 3 3 7 ) & 2 0 F G - 2 ( F V - 3 3 8) C lo a e F u e l g a s V e n t v a lv e s 2 0 V G - 1 ( F V - 1 0 9) O ffs k id V a lv e s C lo s e F u e l B lo c k V a lv e 2 0 F B - 2 ( S O V 0 1 0 0 2B ) < 1 > O p e n F u e l V e n t V a lv e 2 0 F V - 1 ( S O V 0 1 0 0 1A ) < 1 > ( 3 ) I n t e rn l S o f tw a re S ig n a l 2 0 F V - 2 ( S O V 0 1 0 0 1B ) < 1 > < 4 >

Figure 4 - Ignition and warmup

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1.5 ACCELERATION TO OPERATIVE SPEED

D

Master selector (2)

Turbine speed above self sustaining

speed?

Starting system de-activated Yes

Turbine speed above min operative

speed?

Auxiliary lube oil pump de-activation (1) Yes

E

Turbine and Auxiliaries

Sequences

External

Sequences

Process

Sequences

-Manual -Auto -Remote -Fire NOTES: (1) Mechanical Pump is operative (2) HMI software switch. ACCELERATING No No (41 FX ) Excitation enabled GCPP SHT 8 SHT 10 XS-212

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1.6 COMPLETE SEQUENCE AND SYNCRONIZATION

Turbine start sequence ended-turbine is running (L3=1 ) Aux. Ready to load? Yes E

Sequences

Process Sequences

Auxiliaries Ready to Load (L3ARL) software signal details are described in 2.5 “LOAD READY” No GT speed = 100.3%? No FSNL Yes (52SX) Syncronization permissives OK? Auto Off No Auto sync. In progress Resynch. requested? Auto sync. OK? No Yes No HMI Resynch. push button (25 ) F GCPP manual syncronization GCPP Turbine ready to syncronize GCPP GCPP Sync. selector generator circuit breaker close command GCPP Manual (GCPP-AUTO) Yes Yes

For details see 2.6 “SYNCRONIZATION PERMISSIVES” SHT 9 SHT 11 SHT 5 XS-209 XS-202 XS-215 (1) (1) Software Signal Note

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1.7 LOAD MANAGEMENT

F

Sequences

Master Selector (1)

Active Power Output increased/decreased through to Raise/

Lower on PMS

Active Power Output according to Base Load or Preselected

Load input on HMI

Active Power Output increased/decreased through to Raise/Lower

push buttons on HMI

End Sequence Master Selector (1) in Remote position ISO/DROOP mode selection PMS Yes No HMI Master selector in Remote position PMS HMI ISO/ DROOP mode selection ( LOC -REM) ISO/DROOP mode selected Auto Manual Remote Active Power Raise PMS Active Power Lower PMS PMS-RS) (PMS-LS) Reactive Power Output increased/ decreased through to Raise/Lower on PMS Reactive Power Raise PMS Reactive Power Lower PMS (PMS- R-RF) (PMS- R-LS) Notes: (1) HMI software switch. SHT 10 XS-222 ISO/ DROOP XS-219 XS-175 XS-176 XS-224 XS-225 GCPP

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1.8 SHUTDOWN REQUEST

Turbine and Auxiliaries Sequences External Sequences Process Sequences Master Selector (1) -Remote HMI STOP? -Crank -Fire -Manual -Auto Start sequence No No Aux.STOP ? Process STOP ? L94PSHD Core Engine STOP(2)? No No Customer STOP ? G G Yes Yes End sequence Yes Auxiliaries shutdown request

includes requests from the following systems:

-Wheelspaces (L94ASHD_WHE) -Seismic Vibration (L94ASHD_VIB) -Inlet Air and Filtr. (L94ASHD_IAF)

See 2.7 “SHUTDOWN” for details.

No Stop push button on HMI Yes Yes AND TRUE Generator Lockout Relay de-energized GCPP (K86G2) PMS Stop Command PMS (PMS-94X) Notes

(1) HMI software switch. (2) Core engine stop and trip are generated by core engine standard software, developed to manage fuel gas valves and speed control.

SHT 15 SHT 15 - Ventilation L 3ASP_ENC ) - GCPP XS-227 XS-182 DCS Stop Command DCS (DCS- STOP) XS-115 OR (3) Software Signal (3)

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1.9 TRIP REQUEST

Turbine and Auxiliaries Sequences External Sequences Process Sequences Start sequence Aux Trip? Core Engine Trip? No H Yes End sequence No No Auxiliaries trip request includes

the following software requests: -Process (L4PTRIP)

-Lube Oil (L4ATRIP_LO) -Seismic Vibration (L4ATRIP_VIB)

-Starting Device (L4ATRIP_SD) -Enc.Ventilation (L4ATRIP_ENC)

See 2.8 “TRIP” for details.

Customer Trip? Customer trip command DCS (L4CTRIP) Yes Yes GCPP Trip? Trip to driver from protections GCPP (K4-TRIP) No Yes SHT 15 SHT 5 XS-183 XS-177

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1.10 COOLDOWN SEQUENCE

I

Turbine and Auxiliaries Sequences External Sequences Process Sequences End Sequence GT zero speed reached? No Hydraulic Ratchet system start Yes

- Lube oil system stop - Hydraulic ratchet system stop - Oil vapour separator stop

Yes L62CD=1 Cooldown timer expired? No SHT 15

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1.11 SHUTDOWN AND TRIP SEQUENCE

UNLOADING Yes HMI START? RELOADING Shutdown sequence aborted L3= 0(3) DECELERATING L14 HS= 0(3) - Mineral Lube Oil system

activated

Turbine and Auxiliaries Sequences External Sequences Process Sequences _G Yes FlameOut?

Lube Oil Cooler timer activated - Ventilation System Stop Timer expired? Ventilation Timer activated expired ?

- Lube oil_Cooler system Stop Yes End Yes Turbine Normal Stop GCPP Turbine Normal Stop PMS ( 94X) ( PMS - 94X) Reverse Power? (1) Gen. Circuit Breaker opening command GCPP ( 52GT) NOTES:

(1) MKVIe Reverse Power Limit to be set higher Then GCPP Reverse power

Protection value. . (2) TNH– Turbine Speed L4= 0(3)Yes H Trip from driver GCPP L4=0(3) 4X- 32 OR

- Mineral Lube Oil system activated GT minimum operative speed? I To Cooldown Yes Flame Out? Yes OR N o L 62 CD= 0(3) No SHT12 From Sht 1 3 SHT14 GT under minimum operativespeed? Yes XS- 211 XS- 227 XS- 216 XS- 210

Close Fuel gas Block valves 20FG-1( FV- 337 ) &20FG- 2( FV- 338)

Off Skid Valves

Open Fuel gas Vent valves 20VG- 1( FV- 109)

On Skid Valves Close Fuel gas Block valves 20FG-1( FV- 337 ) &20FG- 2( FV- 338)

Open Fuel gas Vent valves 20VG- 1( FV- 109)

Close Fuel Block Valve 20FB-2( SOV 01002B)

Open Fuel Vent Valve 20FV-1( SOV 01001A)

Offskid Valves Unit Summary Trip

Shutdown in Progress L 94X(3) (3 ) Software Signal 20FV-2( SOV 01001B) Timer <4> N o N o N o N o N o N o

Figure 11 - Shutdown and Trip sequence

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2 STATUS DEFINITION

The main checks performed by the MKVIe software before starting different turbine sequences are listed in the following tables.

Signals descriptions shall be considered related to software signals in the first columns.

2.1 AUXILIARIES START READY

SOFTWARE TAG JOB TAG (GE TAG) DESCRIPTION SYSTEM

LOGIC TAG AG

NOT L71QL_W NOT LT -301 (96QL1) LUBE OIL TANK LEVEL LOW MINERAL LUBE OIL NOT l27qel NOT XS -101 (27QE) LUBE OIL EMERGENCY PUMP

UNDERVOLTAGE ALM MINERAL LUBE OIL

NOT l49qe NOT XS -102 (49QE) LUBE OIL EMERGENCY PUMP

OVERLOAD ALARM MINERAL LUBE OIL

L26QN_W NOT TE -307 (LT-OT-1) LUBE OIL TANK TEMP LOW <2> MINERAL LUBE OIL NOT l49hr1a NOT XS -106 (49HR) HYDRAULIC RATCHET PUMP

OVERLOAD ALARM HYDRAULIC RATCHETING

NOT L27hr NOT XS -105 (27HR) HYDRAULLIC RATCHET PUMP

MOTOR MINIMUM VOLTAGE HYDRAULIC RATCHETING L33EA1AO<4> ZSH -216 (---) <4> AIR EIECTOR CONTROL VALVE

-VALVE OPEN<4>

COOLING & SEALING AIR SYSTEM<4>

L33EA1BO<4> ZSH -217 (---) <4> AIR EIECTOR CONTROL VALVE -VALVE OPEN <4>

COOLING & SEALING AIR SYSTEM<4>

NOT L26BA¹ NAN

D TE -296 A (TT-BA-2A) TE -296 B (TT-BA-2B) TE -296 C (TT-BA-2C) TURBINE COMPARTMENT

INTERNAL TEMP. VENTILATION

L33dtc<2> TURBINE ENCLOSURE ACCESS

DOORS CLOSED VENTILATION

GEARBOX ENCLOSURE ACCESS DOOR CLOSED VENTILATION NOT ZSL -206 A (33DT-1) -ZSL -206 J (33DT-10)

GEARBOX ENCLOSURE ACCESS DOOR CLOSED

VENTILATION l33ido1¹ NOT ZSH -207 A (33ID-1) VENTILATION INLET DAMPER OPEN VENTILATION l33ido2¹ NOT ZSH -207 B (33ID-2) VENTILATION INLET DAMPER OPEN VENTILATION l33odo1¹ NOT ZSH -202 A (33OD-1) TURBINE COMP. VENTILATION

OUTLET OPEN VENTILATION

l33odo2¹ NOT ZSH -202 B (33OD-2) COUPLING COMP. VENTILATION

OUTLET OPEN VENTILATION

l33cb1o<2>

l33cb2o<2> ZSH -201 (33CB-1) ZSH -200 (33CB-2)

VA2-1 ANTISURGE VALVE OPEN

VA2-2 ANTISURGE VALVE OPEN VENTILATION

NOT L63FGH_W1 NOT

PT -109 A (96FG-2A) PT -109 B (96FG-2B) PT -109 C (96FG-2C)

INTERSTAGE FUEL GAS PRESSURE

HIGH FUEL GAS

NOT L63FGL_W2<2> NOT

PT -109 A (96FG-2A) PT -109 B (96FG-2B) PT -109 C (96FG-2C)

INTERSTAGE FUEL GAS PRESSURE

LOW FUEL GAS

L33vg2_c<2> ZSL -100 (33VG-2) WARM-UP LINE VENT VALVE FUEL GAS

---L33P2 NAN

D

---FUEL BLOCK VALVE AND ---FUEL VENT VALVE IN CORRECT SEQUENCE

VALVES SEQUENCING NOT

l45hta NOT XS -167 (45HTA) TURBINE ENCLOSURE GAS DETECTED ALARM

FIRE FIGHTING & GAS DETECTION

1

Start permissive enabled after line depressurization.

2

Start permissive enabled after line depressurization.

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LOGIC TAG AG

NOT l33cr_a1 NOT WSL -703 (33CR-A) CO2 BOTTLE LIMIT SWITCH BANK-A COMMON BANK-ALBANK-ARM

NOT l33cr_b³ NOT WSL -706 (33CR-B) CO2 BOTTLE LIMIT SWITC BANK-B COMMON ALARM

ZSH -702 A (33CP-4A)

l33cp_a <3>

l33cp_b <3> AND

ZSH -702 B (33CP-4B)

FIRE FIGHTING CO2 DISCHARGE

VALVES OPEN _{FIRE FIGHTING & GAS}

DETECTION NOT l33cp_c NOT XS -160 (33CP-1) FIRE FIGHT.CO2 DISCH.VALVES

CLOSED ALM

NOT l86fg NOT XS -172 (86FG) FIRE & GAS SYSTEMS FAULT FIRE FIGHTING & GAS DETECTION

NOT l43cp_i NOT FIRE FIGHTING ELECTRIC

DISCHARGE DISABLED ALARM

L43ffb<2> HS -232 (43FFB-1) FIRE FIGHTING SYST. MANUAL SELECTOR

NOT l86vmn<2> NOT XS -233 (86VM) VIBRATION MONITORING SYSTEM

FAULT VIBRATION MONITOR

NOT l86ps AND

XS -154 (86PS-1) XS -121 (86PS-2)

24 VDC POWER SUPPLY FAILURE 110VDC/24VDC

UCP

l27mc1n XS -152 (27MC) MCC VOLTAGE NORMAL MCC

XS -155 (74X-MCC) DRAWERS TRIP COMMON

ALARM(K74X) MCC

NOT l80x NOT XS -108 (DCP-80X) MINIMUM BATTERY VOLTAGE

ALARM DCP

NOT l30ra NOT XS -110 (DCP-30RA) DCP-RECTIFIER 'A' COMMON

ALARM DCP

NOT l30rb NOT XS -109 (DCP-30RB) DCP-RECTIFIER 'B' COMMON

ALARM DCP

NOT NOT XS -111 (DCP-BD) DCP-BATTERY DISCHARGING DCP

l3comm_io<2> I/Os pack communicating

NOT l86mp NOT Master Protective Startup Lockout

1

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2.2 START PASSED

LOGIC TAG LOGIC TAG

l52qa XS -135 (52QA) LUBE OIL AUXILIARY PUMP RUNNING MINERAL LUBE OIL NOT

L52hq

NOT XS -133

(52HQ)<1>

HYDRAULIC OIL AUXILIARY PUMP RUNNING

HYDRAULLIC OIL

L52qv XS -151 (52QV) LUBE OIL VAPOUR SEPARATOR #1

RUNNING MINERAL LUBE OIL

NOT L63QA2L_W NOT

PT -310 A (96QT-2A) PT -310 B (96QT-2B) PT -310 C (96QT-2C)

LUBE OIL HEADER PRESSURE LOW MINERAL LUBE OIL

NOT L63QT NOT PT -310 A (96QT-2A) PT -310 B (96QT-2B) PT -310 C (96QT-2C)

LUBE OIL HEADER PRESSURE LOW

LOW MINERAL LUBE OIL

l52bt11 XS -124 (52BA-1) TURB.ENCLOSURE VENT.FAN #1

RUNNING VENTILATION

OR

l52bt2¹

OR

XS -127 (52BA-2) TURB.ENCLOSURE VENT.FAN #2

RUNNING VENTILATION NOT L63BT_W¹ NOT PDT -205 A (96SV-1A) PDT -205 B (96SV-1B) PDT -205 C (96SV-1C)

TURBINE ENCLOSURE PRESSURE

LOW VENTILATION

L3QE_TEST<2> LUBE OIL EMERGENCY TEST

PASSED VENTILATION

1

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2.3 CRANK READY

LOGIC TAG LOGIC TAG

NOT L71QL_W NOT LT -301 (96QL1) LUBE OIL TANK LEVEL LOW MINERAL LUBE OIL

l52qa XS -135 (52QA) LUBE OIL AUXILIARY PUMP

RUNNING MINERAL LUBE OIL

NOT L63QA2L_W NOT

PT -310 A (96QT-2A) PT -310 B (96QT-2B) PT -310 C (96QT-2C)

LUBE OIL HEADER PRESSURE LOW

MINERAL LUBE OIL L26QN_W NOT TE -307 (LT-OT-1) LUBE OIL TANK NORMAL MINERAL LUBE OIL NOT L63FGL_W1 NOT PT -108 (96FG-1) UPSTREAM SRGC VALVE

PRESSURE LOW FUEL GAS

NOT L26FGL_W1 NOT

TE -104 A (TG-FG-1) TE -104 B (TG-FG-2) TE -104 C (TG-FG-3)

FUEL GAS TEMPERATURE INLET

LOW FUEL GAS

L43C MASTER SELECTOR IN CRANK

POSITION FUEL GAS

L33VG2_C1 ZSL -100 (33VG-2) WARM-UP LINE VENT VALVE FUEL GAS

---L3PRC NAND

---FUEL BLOCK VALVE AND ---FUEL VENT VALVE IN CORRECT SEQUENCE

VALVES SEQUENCING

L52hq

NOT

XS -133 (52HQ) <1> HYDRAULIC OIL AUXILIARY PUMP RUNNING

HYDRAULLIC OIL

1

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2.4 FIRE READY

1

These signals are cumulated in “Process Ready to Fire” condition signal.

LOGIC TAG LOGIC TAG

NOT L63HQ1L_W NOT PT -324 (96HQ-1) HYDRAULIC OIL HEADER

PRESSURE LOW HYDRAULIC OIL

NOT L43BW - WATER WASH ON SELECTED WATER WASH

NOT L83BW - TURBINE/COMPRESSOR WATER

WASH CONTROL WATER WASH

NOT L63FGL_W NOT PT -108 (96FG-1) UPSTREAM SRGC VALVE

PRESSURE LOW FUEL GAS

NOT L26FGL_W NOT

TE -104 A (TG-FG-1) TE -104 B (TG-FG-2) TE -104 C (TG-FG-3)

FUEL GAS TEMPERATURE INLET

LOW FUEL GAS

l33vg2_c ZSL -100 (33VG-2) WARM-UP LINE VENT VALVE FUEL GAS

NOT l27gcpp1 NOT XS -194 (27GCPP) GCPP POWER WATCH DOG GCPP

NOT l86g1¹ NOT XS -184 (K86G1) GENERATOR CKT BREAKER 52G

LOCKOUT RELAY GCPP

NOT l8vtm¹ NOT XS -198 (K-8VT-M) METERING REFERENCE

VOLTAGE-FAULT GCPP

NOT l86g2¹ XS -182 (K86G2) GENERATOR LOCK OUT RELAY GCPP

NOT l8vtp¹ XS -197 (K-8VT-P) PROTECT REFERENCE VOLTAGE

-FAULT GCPP

NOT l27pr¹ NOT XS -193 (27PR) PROTECTION RELAY COMMON

FAULT GCPP

NOT l8vtavr¹ NOT XS -199 (K-8VT-AVR) AVR REFERENCE

VOLTAGE-FAULT GCPP

NOT l8vtb1¹ NOT XS -200 (K-8VT-B1) BUS REFERENCE VOLTAGE

-FAULT GCPP

NOT l26tw¹ NOT TSHL -434 (26TW-1) ON/OFF-LINE WASHING TANK

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2.5 LOAD READY

LOGIC TAG LOGIC TAG

NOT l52qa NOT XS -135 (52QA) LUBE OIL AUXILIARY PUMP RUNNING MINERAL LUBE OIL

l72qez NOT

XS -100 (4QE) LUBE OIL EMERGENCY PUMP STOP COMMAND

MINERAL LUBE OIL

NOT L52hq NOT XS -133 (52HQ) <1> HYDRAULIC OIL AUXILIARY PUMP RUNNING

HYDRAULLIC OIL

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2.6 SYNCRONIZATION PERMISSIVES

SOFTWARE TAG LOGIC DESCRIPTION SYSTEM

LOGIC TAG LOGIC TAG

l43avr XS -196 (AVR-43X-A) AVR AUTOMATIC CONTROL

SELECTED GCPP

NOT l43avrlc

NOT XS -195 (AVR-43-LC)

AVR LOCAL CONTROL

SELECTED GCPP

l3gg XS -187 (3GG-25A) AUTOMATIC SYNCHRONISING

ENABLED TO UCP GCPP

NOT l52gx1 NOT XS -188 (K52GX-1A) GEN CIRCUIT BREAKER 52G

CLOSED GCPP

l41x XS -192 (41X-1) EXCITATION CONTACTOR

CLOSED GCPP

NOT l8vtm NOT XS -198 (K-8VT-M) METERING REFERENCE

VOLTAGE-FAULT GCPP

NOT l8vtp NOT XS -197 (K-8VT-P) PROTECT REFERENCE

VOLTAGE -FAULT GCPP

NOT l8vtavr NOT XS -199 (K-8VT-AVR) AVR REFERENCE

VOLTAGE-FAULT GCPP

NOT l8vtb1 NOT XS -200 (K-8VT-B1) BUS REFERENCE VOLTAGE

-FAULT GCPP

NOT lavr43lc<3> NOT Gen. AVR local control selected GCPP

NOT l43gcpp-m<3> NOT Gen.GCPP selector in manual

mode GCPP

NOT l86g1<3> NOT Gen. Circuit Breaker lockout relay GCPP

NOT l25m<3> NOT Gen. Manual sync. In progress GCPP

lavr43xa<3> Gen. AVR automatic control

selected GCPP

l43gcpp-a<3> Gen.GCPP selector in auto mode _GCPP

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2.7 SHUTDOWN

LOGIC TAG LOGIC TAG

TAHH-208 TAHH-209 TAHH-213 TAHH-214

WHEELSPACE TEMPERATURE HIGH

HIGH SHUTDOWN WHEELSPACE

TAH-208 TAH-209 TAH-213 L30WSA_SD1 OR

TAH-214

WHEELSPACE TEMPERATURE HIGH

ALARM1 WHEELSPACE

L63TF PDAHH252

TURB.INLET FILTER DIFFERENTIAL PRESSURE HIGH HIGH MEDIAN SHUTDOWN LOGIC

INLET AND FILTRATION

L94gshd<2> (26CT + K86G2) GENERATOR SHITDOWN COMMAND GCPP

L39vd2<3> VE -209 A (39V-1A) VE -209 B (39V-1B) VE -210 A (39V-2A) VE -210 B (39V-2B)

TURBINE BRG.#1 VIBRATION TURBINE CASING VIBRATION

CONTROL & PROTECTION

1

Shutdown is started if wheel space temp. is detected high for 24 hours

2

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2.8 TRIP

1

Trip signal enabled if no flame is detected (NOT L28FDX).

2

Trip enabled if the turbinie shaft speed is below minimum operative speed (95% of rated speed).

3

UCP emergency shutdown pushbutton has double contacts; l5esd1 signal is inverted.

4

Signals cumulated in Process shuitdown software signal.

SOFTWARE TAG JOB TAG ( GE TAG) DESCRIPTION SYSTEM

LOGIC TAG LOGIC TAG

L26QT TAHH-305 LUBE OIL HEADER TEMP HIGH HIGH

MEDIAN TRIP LOGIC

MINERAL LUBE OIL

L63QTX PALL-310 LUBE OIL PRESSURE LOW LOW

MEDIAN TRIP LOGIC

MINERAL LUBE OIL

L63QVT PDAHH-300 LUBE OIL TANK PRESSURE HIGH HIGH

TRIP

MINERAL LUBE OIL

L4QE_TRP LUBE OIL EMERGENCY PUMP TRIP

SIGNAL

MINERAL LUBE OIL

L3SMTX 86DS2 STARTING DEVICE TRIP LOGIC STARTING DEVICE

L26BT TAHH- 296 TURBINE COMPARTMENT

TEMPERATURE HIGH HIGH TRIP VENTILATION

l45htt XS -168 (45HTT) TURBINE ENCLOSURE GAS DETECTED

TRIP

l45hft XS -166 (45HFT) TURBINE AIR FILTER GAS

DETECT.TRIP

l45ftt XS -163 (45FTT) TURBINE ENCLOSURE FIRE DETECTED

TRIP

FIRE FIGHTING & GAS DETECTI

l63cpd PAHH-712 CO2 DISCHARGE ACTIVATED FIRE FIGHTING &

GAS DETECTION

l5esdv1 HS -221 (5ESD-1) TURBO UNIT EMERGENCY SHUTDOWN

BUTTON

ENCLOSURE EMERGENCY SHUTDOWN

l5esdv2 HS -220 (5ESD-2) TURBO UNIT EMERGENCY SHUTDOWN

BUTTON

ENCLOSURE EMERGENCY SHUTDOWN NOT l4_fb3 NOT XS -153 (5ESD-1)3 EMERGENGCY SHUTDOWN PB ON

UCP

UCP EMERGENCY SHUTDOWN

L3SFLT - CONTROL SYSTEM FAULT TRIP UCP

PROTECTIONS

l4tesd4 PSS-TRIP TRIP COMMAND FROM PSS PSS

l4prot4 XS -183 (K4-TRIP) TRIP DRIVER FROM PROTECTION GCPP

XS -210 (4X-32) TRIP FROM DRIVER GCPP

l26gbtx4 TAHH-374

TAHH-370

GENERATOR BEARINGS METAL TEMPERATURE HIGH TRIP

BEARING TEMPERATURE MONITOR XAHH - 351 (XAHH-351) GB HS SHAFT RADIAL VIBRATION TRIP BN

XAHH -352 (XAHH-352) GB LS SHAFT RADIAL VIBRATION TRIP BN XAHH -354 (XAHH-354) GB HS SHAFT RADIAL VIBRATION TRIP

BN

XAHH -353 (XAHH-353)

<3> GB LS SHAFT RADIAL VIBRATION TRIP BN XAHH-355 (XAHH -355) GENERATOR RADIAL VIBRATION TRIP BN XAHH-356 (XAHH -356) GENERATOR RADIAL VIBRATION TRIP BN L39gvtx<3>

VAHH-352 (VAHH -352) GEN. SEISMIC VIBRATION CUMULATIVE TRIP

BN L39gvtx<3> _{VAHH-353 (VAHH -353)} GEN. SEISMIC VIBRATION

CUMULATIVE TRIP

BN

ZAHH -351 (ZAHH-351) GEAR BOX LS SHAFT AXIAL DISP. TRIP BN TE -211 A (TT-XD-1) ---TE -211 M (TT-XD-13) EXHAUST TEMPERATURE THERMOCOUPLE CONTROL & PROTECTION

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1

Trip signal enabled if no flame is detected (NOT L28FDX).

2

Trip enabled if the turbinie shaft speed is below minimum operative speed (95% of rated speed).

3

UCP emergency shutdown pushbutton has double contacts; l5esd1 signal is inverted.

4

Signals cumulated in Process shuitdown software signal.

SOFTWARE TAG JOB TAG ( GE TAG) DESCRIPTION SYSTEM

LOGIC TAG LOGIC TAG

NOT L28FDT NOT BE -200 P (28FD-2P)1 BE -201 P (28FD-3P) BE -202 P (28FD-7P) BE -203 P (28FD-8P) FLAME DETECTORS CONTROL & PROTECTION SE -200 A (77NH-1)2 SE -200 B (77NH-2) SE -200 C (77NH-3)

MAGNETIC SPEED PICK UP

CONTROL & PROTECTION XAHH -355 (XAHH-355) GENERATOR RADIAL VIBRATION TRIP BN

XAHH -356 (XAHH-356) GENERATOR RADIAL VIBRATION TRIP BN L39vt<2> VE -209 A (39V-1A)

VE -209 B (39V-1B) VE -210 A (39V-2A) VE -210 B (39V-2B)

TURBINE BRG.#1 VIBRATION TURBINE CASING VIBRATION

CONTROL & PROTECTION

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3 AUXILIARIES SEQUENCING

3.1 MINERAL LUBE OIL

3.1.1 DEVICE SUMMARY

DEVICE NAME CUSTOMER TAG DESCRIPTION

TL-1 --- LUBE OIL TANK

PL-1 --- MAIN LUBE OIL PUMP

PL-2 --- LUBE OIL AUXILIARY PUMP

PL-3 --- EMERGENCY PUMP

88QA --- LUBE OIL AUXILIARY PUMP MOTOR

88QE --- EMERGENCY PUMP MOTOR

96QL1 LT -301 LUBE OIL TANK LEVEL

FL-1A/1B --- LUBE OIL DUPLEX FILTER

96QQ-1 PDT -308 LUBE OIL FILTERS HEADER

LT-TH-1A LT-TH-1B LT-TH-1C TE -305 A TE -305 B TE -305 C

LUBE OIL HEADER TEMP.

LTBT1D-1 TE -311 LUBE SYSTEM THRUST BRG. DRAIN

96QT-2A <1> 96QT-2B 96QT-2C PT -310 A PT -310 B PT -310 C

LUBE OIL HEADER PRESSURE

LTB1D-A TE -312 LUBE SYSTEM JOURNAL BRG. #1 DRAIN

LTB2D-1 TE -313 LUBE SYSTEM JOURNAL BRG. #2 DRAIN

--- PI -357 B INSTRUMENT AIR REGULATION

PI-38 PI -380 VAPOUR SEPARATOR INLET PRESSURE

96QV-1A <1> 96QV-1B 96QV-1C PDT -300 A <1> PDT -300 B PDT -300 C

LUBE OIL TANK INTERNAL PRESSURE

LT-OT-1 <1> TE -307 LUBE OIL TANK TEMPERATURE

PI-351 PI -406 ON-LINE WASHING WATER

3.1.2 SOFTWARE DESCRIPTION

Cooldown

Cooldown phase starts after flame loss detection and machine stop; it is the time period during which the machine is cooled and the lube oil is provided using auxiliary pump or emergency pump (only if auxiliary pump is damaged or the MKVIe is powered off).

Cooldown sequence is enabled by the MKVIe two seconds after loss of flame in combustion chamber (L28FDZ software signal is false). This timer is started as soon as the shaft is detected at zero speed (L14HR internal MKVIe software signal) and remains active for total cooldown duration of 10 hours. Cooldown end is detected by software signal L62CD, generated by MKVIe logic after receiving the ZSL -300 (33HR1), HYDRAULIC RATCHET LIMIT SWITCH signal.

Auxiliary pump logic Request during unit startup

During unit startup (L14HSX internal software signal is false), the auxiliary pump is started (with l4qaz software command and XS -134 (4QA) hardwired signal to MCC) when the turbine start sequence is activated (software signal L1Z is false). It continues to work until the shaft reaches minimum operative

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speed that is 95% of rated speed (L14HSX is true). After that, the main mechanical lube oil pump becomes sufficient to provide the needed oil pressure by itself.

Request during normal operation

When the shaft is above minimum operative speed, the auxiliary pump is started if the lube oil header pressure is detected low by L63QA2L_W voted software signal (corresponding to PAL-308 alarm) and this condition is verified for more then K63QALY software constant (typically 2.5 s)

Software alarm L52QA_ALM is generated upon auxiliary pump running detection operated by software signal l52qa and hardwired signal XS -135 (52QA).

Stop during normal operation

If the pump was started during normal operation, it remains running also if starting conditions are reset, due to the motor feedback latching the run command. The pump can be stopped manually by the operator from the HMI (L43QAS_CPB command) or from MCC (motor feedback l52qa drops down).

Request during shutdown

After unit shutdown request, the auxiliary pump is started when the shaft speed decreases below the minimum operative speed and keep on running till cooldown completion.

Manual control

If lube oil tank level is not low (L71QL_W software signal and LAL-301 alarm are not raised), auxiliary pump can be manually started from the HMI with L43QA_CMD command. If manual manual operation is de-selected, the pump returns under automatic control and can be stopped as described above.

Emergency pump logic

The emergency pump provides lube oil pressure in case of failure of auxiliary pump or during the emergency cooldown. It is started by DCP after receiving XS -100 (4QE) signal.

The pump is then stopped if lube oil pressure is restored (L63QNX) or if the cooldown time is ended.

Lube oil alarms and trips

If lube oil header temperature (ltth1 software signal) is detected higher than threshold K26QA (typically 72°C), software output L26QA_W and alarm L26QA_ALM, corresponding to TAH -305 alarm, are generated.

If lube oil header temperature is detected higher than K26QT constant (80°C) by trip logic, trip L26QT and alarm L26QT_ALM (related to P&Id TAHH -305 alarm) are generated if unit is running (L4 =1).

If lube oil header pressure (software signal A63QA_W) is higher then the threshold K63QN (typically 1.4 barg), L63QN_W software signal is generated.

If lube oil header pressure is lower than the threshold K63QA2L (typically 1.2 barg), software output L63QA2L_W and alarm L63QA2L_ALM is generated.

If lube oil header pressure is detected lower than K63QT threshold (typically 0.96 barg) by trip logic, software output L63QT is generated. Also trip L63QTX and alarm L63QT_ALM (PALL-310 P&Id alarm) are generated if unit is running (L4=1).

If lube oil filter differential pressure is detected higher than 1.7 bar (K63QQ1H threshold) by a63qq1 software signal for more than K63QQ1H_ALM (typically 1 s), software alarm L63QQ1H_ALM, corresponding to PDAH-308, is generated

If lube oil tank level (a71qt software signal) is detected high, alarm LAH-301 and software alarm L71QH_ALM are generated.

If lube oil tank level is detected low, software output L71QL_W and alarm L71QL_ALM, corresponding to LAL-301, are generated.

If at least one bearing drain oil temperature is detected higher than its threshold, summarized software alarm L30LOA_ALM is generated; the related P&Id alarms are TAH-311, TAH-312, TAH-313.

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TAH-305 is also generated if median failures are detected by healthy signal from TE -305 A (LT-TH-1A), TE -305 B (LT-TH-1B) & TE -305 C (LT-TH-1C).

If lube oil temperature measurements spread is higher then maximum spread allowed K26QA_FLT for more then K26QT_SENSR (typically 60s), then software alarm L26QT_SENSR is generated.

If lube oil header pressure measurements spread is higher then maximum spread allowed K63QA_FLT for more then K63QT_SENSR (typically 10s), then alarm L63QT_SENSR is generated.

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3.2 OIL VAPOUR SEPARATOR

DEVICE SUMMARY

QV-1 --- VAPOUR EXTRACTOR

88QV-1 --- LUBE OIL MIST SEPARATOR MOTOR

PDS-1 --- MINERAL OIL MIST ELIMINATOR

96QV-1A 96QV-1B 96QV-1C<1> PDT -300 A PDT -300 B PDT -300 C

LUBE OIL TANK INTERNAL PRESSURE

SOFTWARE DESCRIPTION

Oil vapour separator fan control sequence

The lube oil vapour separator fan motor is started (with l4qv software command converted into XS -150 (4QV) hardwired command to the MCC) when the start sequence is initiated (software signal L1). The fan continues to run until the enclosure ventilation remains active.

The fan is also started if the following conditions are all verified:

Lube oil heaters ON command (L4QTX software signals that generates XS -145 1) , XS -147 (4QT-2), hardwired commands sent to the MCC)

Normal temperature in oil tank (L26QN_W software signal).

Oil vapour separator fan manual operation

When fan extractor is not required running by automatic control sequence described above, the lube oil vapour separator fan motor 88QV-1 can be manually started (L43QV_CMD) and stopped (NOT

L43QV_CMD OR L43QVS_CPB) by the operator in front of the HMI.

Oil vapour separator fan emergency stop

The lube oil vapour separator fan motor can be manually stopped via MCC, activating LO MIST SEP FAN ESD in field; a relevant alarm will be displayed on HMI.

Lube oil tank pressure alarms and trips

If lube oil tank pressure (A63QV_W software signal) is detected high, L63QVA_W signal picks up and software alarm L63QVA_ALM, complementary to PDAH-300, is generated.

If the same signal value is detected high by trip logic, trip L63QVT and alarm L63QVT_ALM, complementary to PDAHH-300 P&Id alarm, is generated.

Instrumentation fault logic

If the maximum lube oil tank pressure measurements spread exceeds the K63QV_FLT threshold for more than K63QVT_SENSR (10s), L63QVT_SENSR alarm is generated.

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3.3 LUBE OIL HEATER

DEVICE SUMMARY

23QT-1 --- LUBE OIL ELECTRIC HEATER

LT-OT-1 TE -307 LUBE OIL TANK

49QT-1 TSHH -300 LUBE OIL TANK HEATER CUT OUT

Heater cutout logic

Cutout conditions for lube oil heater on command auxiliary software signal (L4QTX) are listed below: Lube oil tank level low (LAL-301)

Flame detected (L28FDX = 1)

Overtemperature detected by all lube oil tank heaters switches [l26qth1\ 2\3 &4 software signals; TSHH -300 (49QT-1), TSHH -301 (49QT-2), TSHH -302 (49QT-3), TSHH -303 (49QT-4) are hardwired signals]. Each heater command [l4qt1-4 software signals 4QT-1-4 are hardwired signals] can be also singularly cutout if the associated switch [l26qth1\2\3 & 4; detects over-temperature and the lube oil tank level low alarm is raised (LAL-301). In this condition, a single switch cutout command is repeated to the MCC through one of the l4qt1\2\3 & 4_c software signals [contacts open on cutout].

If over-temperature is detected by at least one lube oil tank heater switch, L26QTH_ALM software alarm is generated.

Heater control logic

If no cutout condition is active, the heater-on auxiliary signal L4QTX picks-up when the lube oil tank temperature (software signal ltot generated by TE -307 (LT-OT-1) is detected lower than threshold K26QL (typically 25°C).

Then, L4QTX drops down when the oil temperature is detected moderate by the threshold K26QM (typically 30°C). Between the two thresholds, L4QTX can be manually dropped down also through a dedicated HMI pushbutton L5QT_S_CPB.

If manual command is active (L43QT_CMD command from HMI), L4QTX can be picked-up and dropped-down manually using L5QT_R_CPB and L5QT_S_CPB HMI pushbuttons. Also, if manual operation is active, L43QT_ALM software alarm is generated.

If not singularly cutout, each heater is turned on and off, according to L4QTX status, through MCC commands signals 4QT-1-C, 4QT-2-C, 4QT-3-C & 4QT-4-C [l4qt1\2\3 & 4 software signals].

Alarms

If lube oil tank temperature is found below a third threshold K26QN (typically 20°C), signal L26QN_W drops down and software alarm L26QN_ALM, related to TAL-307 P&Id alarm, is generated.

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3.4 LUBE OIL COOLER

DEVICE SUMMARY

88QFC-1 --- AIR COOLER FAN MOTOR

23QFC-1<1> --- COOLER FAN MOTOR SPACE HEATER

39QFC-1 VSH -200 AIR COOLER MOTOR FAN VIBR.

MONITORING

VTR-1 <1> TCV -306 THERMOSTATIC VALVE

20QFC-1 <1> XY -200 AIR COOLER MOTOR FAN REMOTE

RESET

RESET SOFTWARE DESCRIPTION

Air cooling (3x50%) control sequence

The described sequence actuates three fans (main, auxiliary and stand-by); each fan is designed to provide 50% of rated airflow.

Auxiliary fan selection

Auxiliary fan selection is done by HMI dedicated pushbutton through signal SC43QFC, normally when all fans are stopped.

Main fan Start/Stop logic

The lube oil cooler main fan is started when flame is detected in combustion chamber (L28FDX=1). The main fan is stopped K4QFCM (typically 120 minutes) after flameout (L28FDX=0).

Lube Oil Tank temperature should be greater Than K26QM (Typically 86oF ) <1>

Stand-by fan Start/Stop logic

Standby fan control is driven by LTTH1_W voted software signal, generated TE 305 A (LTTH1A) , TE -305 B (LT-TH-1B) , TE --305 C (LT-TH-1C) thermocouple outputs.

When the lube oil cooler main fan is running, the stand-by fan is started if the lube oil header temperature LTTH1_W reaches the stand-by fan starting value K26QFCH.

The fan is then stopped if LTTH1_W value decreases below the stand-by stop value K26QFCL. After its stop, the stand-by fan can’t be restarted until K4QFCS_INH_R (typically 120s) time is elapsed. Similarly, Stand-by stop is not permitted for K4QFCS_INH_S (typically 240s) from its start.

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In case of failure of two out of the three lube oil header thermocouples, a backup start/stop logic is provided: regardless of main fan state, the stand-by fan is started and then stopped when the failure condition is no more detected.

The standby cooling fan can only be started during machine running or during the cooldown period.

Auxiliary fan Start/Stop logic

The lube oil cooler auxiliary fan is started when temperature high software alarm is generated (L26QA_W) due to AAH-211, LTTH1_W signal high value (TAH-305) or to the above described thermocouples failure condition.

When this high temperature alarm is reset, the auxiliary fan keeps on running and can be stopped manually by the operator in front of the HMI (L5QFC1÷3_S_CPB commands) or of the MCC. If auxiliary fan is running, L52QFC_ALM software alarm is generated.

Lube Oil temperature control

The oil temperature control is accomplished by varying the oil flow through the cooler with the three way valveTCV -306 (VTR-1) . This valve is regulated through an integrated IP converter by the MKVIe

temperature indication control; the reference temperature used for this control is the mean lube oil header temperature LTTH1_W.

Cooler fans control sequence and changeover

Lube oil cooler high vibration, detected by VSH -200 (39QFC-1) , VSH -201 (39QFC-2) , VSH -202

(39QFC-3) (l39qfc1÷3 software signals), is the cutout condition for the related fan (active in both automatic and manual mode) and generates VAH-200, VAH-201 & VAH-202 alarm. This cutout condition is also repeated to the MCC (l4qfc1÷3_c software signals:XS -137 (4QFC-1-C) , XS -140 (4QFC-2-C) , XS -143 (4QFC-3-C) hardwired signals), in order to disable any possible start condition activation.

Every time the cooler fan motor is detected running by the feedback (l52qfc1÷3), the cooler fan high vibration alarm is inhibited for the time K52QFCZ (10s), by energizing the XY -200 (20QFC-1) , XY -201 (20QFC-2) , XY -202 (20QFC-3) remote reset (l4qfc1÷3_inh software outputs).

The cooler fans start and stop according to the current main/stand-by/auxiliary state and their respective start/stop logic.

While the auxiliary fan is selected manually by the operator, the main and the stand-by fans are selected by internal changeover logic:

Auxiliary selection change cause main and stand-by change preserving cyclic order;

Main/stand-by are exchanged each time the stand-by fan is required to run (inversion of cyclic order); If the running fan becomes the auxiliary or stand-by one and has to be stopped, its stop is delayed of 10 seconds;

The changeover doesn't activate auxiliary fan running alarm L52QFC_ALM;

If changeover is done when all fans are running or stopped, nothing changes except the selection.

Manual control

Every lube oil cooler fan can be controlled in manual mode. When manual mode is selected, each cooler fan maintains its previous status and the summarized software alarm L43QFC_ALM is generated.

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3.5 HYDRAULIC OIL<1>

DEVICE SUMMARY

PH-1 --- HYDRAULIC OIL MAIN PUMP

PH-2 88HQ HYDRAULIC OIL AUXILLIARY PUMP

FH1-1÷2 --- HYDRAULIC OIL DUPLEX FILTER

FH-B --- HYDRAULIC RATCHET OIL FILTER

96HF-1 <1> PDT -323 HYDR. OIL FILTERS DIFFERENTIAL

PRESSURE

96HQ-1 <1> PT -324 HYDRAULIC OIL HEADER PRESSURE

VPR3-1 <!> PCV -320 COMPENSATOR-HYDRAULIC OIL PUMP

DISCHARGE

VR-21 <1> PSV -321 MAIN HYDRAULIC PUMP DISCHARGE

RELIEF

VR-22 <1> PSV -318 AUX. HYDRAULIC PUMP DISCHARGE

RELIEF

Hydraulic oil system takes oil from lube oil system. Oil pressure is increased by the mechanically driven pump PH-1. PH-1 delivery pressure is controlled by PCV -320 (VPR3-1) regulator.

The auxiliary pump PH-2, driven by an AC electric motor 88HQ, provides necessary oil pressure during startup and shutdown phases. Moreover, during turbine normal operation, it provides a backup function on main pump PH-1.

Relief valves PSV -318 (VR-22) &PSV -321 (VR-21) are provided respectively at PH-1and PH-2 delivery to protect the system against overpressure.

FH1-1 and FH1-2 twin filter system supplies clean oil to the downstream equipment. High differential pressure across filters is detected by differential pressure trasmitter PDT -323 (96HF-1) .

Hydraulic oil pressure is monitored by pressure trasmitter PT -324 (96HQ-1) installed downstream the filtration system.

Hydraulic pump logic Cutout condition

If lube oil header pressure is detected not normal, cutout is performed on the hydraulic pump requests described below.

When unit is stopped, if the cutout condition is active for more than typically 10s from hydraulic pump start request, alarm is generated.

When unit is running, if the cutout condition is active, alarm is generated. In case of lube oil pressure is detected low by PDT -300 A (96QV-1A)

PDT -300 B (96QV-1B) PDT -300 C (96QV-1C) cutout to MCC is generated XS -132 (4HQ-C) .

Request during unit stopped

If cutout condition is not active, during unit stopped the pump can be started by process hydraulic oil request.

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If cutout condition is not active, during startup the auxiliary pump starts when the turbine start sequence is activated. It continues to operate until the HP shaft reaches minimum operating speed. From this point, the main mechanical hydraulic oil pump will provide the necessary oil pressure.

Request during normal operation

When HP shaft is above minimum operating speed, if cutout condition is not active, the auxiliary pump starts if one of the following condition is verified:

Hydraulic oil pressure detected low by pressure switch PT -324 (96HQ-1) Process hydraulic oil request.

During normal operation when hydraulic pump start detected by XS -133 (52HQ) alarm is generated.

Stop during normal operation

If during normal operation the pump has been started, detected by by XS -133 (52HQ)the pump remains running also when the starting condition is reset. It can be stopped manually by operator from HMI or MCC.

Request during shutdown

If cutout condition is not active, when a normal shutdown occurs, the auxiliary pump is started when the HP shaft decreases below the minimum operating speed. The pump will keep running till the master relay is de-energized unless the pump is requested running from process.

Request during emergency shutdown (trip)

If emergency shutdown (trip) is detected, the hydraulic pump is not started. If the pump was already running before the trip event (see request during normal operation), the pump stops typically 10s after the trip.

Manual control

If cutout condition is not active, auxiliary pump can be manually started. If manual operation is deselected, the pump returns to automatic control.

Alarms logic

If hydraulic oil pressure is detected low by PT -324 (96HQ-1)for more then typically 3s, alarm is generated if following conditions are all verified:

Above crank speed

After start passed and before shutdown

Alarm is also disabled 1.5s after that operative speed is reached to account for the stop of auxiliary pump. If hydraulic oil filter differential pressure is detected high by PDT -323 (96HF-1) .for more then typically 1s, alarm is generated.

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3.6 STARTING SYSTEM

DEVICE SUMMARY

20TU FCV -330 TORQUE CONVERTER UNLOADING

33CS-1 ZSL -304 STARTING CLUTCH POSITION

-ENGAGED

PS-1 CHARGE PUMP FOR TORQUE

CONVERTOR

23CR-1 ANTICONDENSATION HEATER

88CR-1 STARTING MOTOR

Starting system provides necessary torque to drive the gas turbine to its self-sustaining speed, at which the energy produced by the HP turbine expansion equals the energy required by the compression. The system consists of the AC three phase electric motor 88CR-1, a torque converter and a Self Synchronizing Starting (SSS) clutch.

Torque converter, connected between electric motor and turbine HP shaft through the SSS clutch, is provided to modify torque features of the motor to fit the starting requirements.

The variable orifice assembly FCV -330 (20TU) is installed on the torque converter drain. The torque converter drain flow can be modified, through the solenoid valve FCV -330 (20TU), to match the cranking/firing speed. The oil flow is also adjustable through a manual variable orifice for calibration purposes.

The clutch limit switch ZSL -304 (33CS-1) is installed in order to detect the engaged status.

Hydraulic ratchet interface logic

When the unit is ready to crank, hydraulic ratchet system energizes the starting clutch solenoid. If the starting clutch is not detected engaged in 10 seconds by ZSL -304 (33CS-1), alarm is generated. The turbine shaft breakaway is helped by hydraulic ratchet system that is stopped as soon as shaft moves.

Torque converter drain valve FCV -330 (20TU) ) control sequence

Before shaft breakaway the valve is closed to maximize the torque during breakaway phase.

After shaft breakaway, when the minimum cranking speed is achieved, the torque converter oil drain valve is opened (energized), in order to reduce the torque and to maintain the specified speed to accomplish purge, ignition and warm-up steps. The valve will be closed again after warm-up step completes, in order to have the maximum torque for accelerating phase.

Electric motor (88CR-1) command permissive

Auxiliaries ready to crank (L3ARC);

Electric motor stopped for more than 20 s XS -129 (52CR) .

Electric motor (88CR-1) turn-on command logic

When starting clutch is detected engaged by ZSL -304 (33CS-1), cranking motor 88CR-1 is started through XS -128 (4CR) signal.

If motor feedback from MCC XS -129 (52CR) .is not detected within 2 seconds, trip and alarm are generated (sequence aborted).

If motor feedback is detected but HP shaft doesn’t overcome zero speed within 30 seconds, trip and alarm are generated (sequence aborted).

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ITEM Cranking speed logic

After shaft break away, when the minimum cranking speed is achieved, the torque converter oil drain valve is opened, in order to reduce the torque and to maintain the specified speed to accomplish purge, ignition and warm-up steps. Signal OPENING is enabled by L4 to avoid the opening of the valve during coastdown. The valve will be closed again after warm-up step completes, in order to have the maximum torque for accelerating phase.

If motor feedbackXS -129 (52CR) .or clutch engaged limit switch ZSL -304 (33CS-1) signals are lost, trip and alarm are generated. Alarm and trip are enabled below accelerating speed and are disabled above the operative speed and in case of trip.

Bog down detection

After 2s pick up delayed flame detection, if speed decreases below a threshold of 5% for more than 1 s, trip and alarm are generated. This trip is active until the HP shaft speed is below the minimum operative speed and it is not active in case of shutdown or trip.

Electric motor (88CR-1) turn-off logic

After warm-up sequence, unit accelerates to full speed. At approx. 50÷60% of rating speed, the inversion of the torque on starting clutch causes its mechanical disengagement (the turbine can sustain itself). This condition is detected by ZSL -304 (33CS-1) limit switch signal and the starting electric motor is turned off. The motor is anyway turned off if HP shaft speed is above self-sustaining speed (60%).

Motor turn-off is also achieved if one of the following conditions is verified: Electric motor system trip;

unit trip (L4)

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3.7 HYDRAULIC RATCHETING

DEVICE SUMMARY

PH-3 --- RATCHET PUMP

88HR --- RATCHET MOTOR

43HR HS -300 HYDRAULIC RATCHET CONTROL

SWITCH

20HR-1 FV -326 HYDRAULIC RATCHET SELF

SEQUENCING VALVES

FH-B --- HYDRAULIC RATCHET OIL FILTER

33HR1 ZSL - 300 HYDRAULLIC RATCHET VALVE

POSITION

33CS-1 ZSL -304 STARTING CLUTCH POSITION

-ENGAGED SOFTWARE DESCRIPTION

The hydraulic ratchet system provides:

breakaway torque to the unit shaft during unit startup;

slow rotations during unit cool down in order to avoid shaft bowing due to non-uniform heat radiation from turbine casings combined with rotor weight;

slow rotations during long-term storage periods.

The sequence described is used to build ratchet pump 88HR command XS -104 (4HR) and starting clutch engage valve open command FV -326 (20HR-1) .The two ratcheting commands are generated at the same time by the same logic. The clutch engaged is detected by limit switch ZSL -304 (33CS-1) signal that cause the cranking motor to start.

Ratcheting commands permissive

Electric cranking motor stopped delayed XS -129 (52CR)

Ratcheting commands cutout conditions

Lube oil pressure low voting trip logic HP zero speed detected for more than 60s. HP shaft control speed signal loss

HP shaft above crank speed

Unit start-up ratcheting sequence

During the unit starting sequence, if no cutout and all permissive conditions verified, the ratcheting begin as soon as the ready to crank is detected (L3ARC). It continues to operate until the HP shaft zero speed is detected (L14HR).

Ratcheting cycles during cooldown

During a stop sequence, the ratchet pump is started 60 seconds after the HP shaft is detected at zero speed; independently from the state of limit switch ZSL -304 (33CS-1) the pump remains running and rotating the shaft until the ZSL -304 (33CS-1)limit switch drop down delayed by 2s is detected. At this point the pump is kept stopped for 180 s, and then the cycle is repeated. Cooldown ratcheting cycles are stopped when cooldown sequence is completed

Manual ratcheting (Jogging)

If HP shaft is below cranking speed the ratcheting cycle can be started manually (jogging) by the local push-button mounted on the ratchet pump skid HS -300 (43HR) or by HMI push button. The local push button has to be closed for more then 2 s to rise the starting jogging command.

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ITEM

The jogging sequence stops 2s after the drop down of limit switch (l33hrf)

Alarms, trips and monitoring

If, during cooldown ratcheting, limit switch ZSL -304 (33CS-1)is not detected for 6 minutes, alarm is generated.

If ratcheting cycle is longer than 30s, alarm is generated.

If hydraulic ratchet motor overload is detected XS -106 (49HR) alarm is generated. Hydraulic ratchet pump running is detected XS -107 (42HR) for monitoring purposes.

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ITEM

3.8 WHEELSPACES

DEVICE SUMMARY

TT-WS1FO-1 TE -208 A WHEEL SPACE TEMP. 1st STAGE FWD OUTER #1

TT-WS1FO-2 TE -208 B WHEEL SPACE TEMP. 1st STAGE FWD OUTER #2

TT-WS1AO-1 TE -214 A WHEEL SPACE TEMP. 1st STAGE AFT OUTER #1

TT-WS1AO-2 TE -214 B WHEEL SPACE TEMP. 1st STAGE AFT OUTER #2

TT-WS2FO-1 TE -209 A WHEEL SPACE TEMP. 2nd STAGE FWD OUTER #1

TT-WS2FO-2 TE -209 B WHEEL SPACE TEMP. 2nd STAGE FWD OUTER #2

TT-WS2AO-1 TE -213 A WHEEL SPACE TEMP. 2nd STAGE AFT OUTER #1

TT-WS2AO-2 TE -213 B WHEEL SPACE TEMP. 2nd STAGE AFT OUTER #2

Alarms and Shutdown logic

There are two single element thermocouples (TC) in each measurement section to monitor the wheelspace temperatures.

If the average temperature of TCs located in one measurement section exceeds the related alarm level for more than 10s, a common software alarm L30WSA2_ALM is generated. This alarm corresponds to TAH-208, TAH-209, TAH-213, TAH-214 P&Id alarms.

If this common alarm remains active for more than 24 hours, L30WSA4_ALM software alarm signal is generated and shutdown sequence is started (L30WSA_SD software shutdown request).

If the average temperature exceeds the shutdown level for more than 10s, a common software alarm L30WSA3_ALM (corresponding to TAHH-208, TAHH-209, TAHH-213, TAHH-214 P&Id alarms) is generated and the shutdown sequence is immediately activated (L30WSA_SD).

For the first hour of operation after the end of starting sequence (L3 is true), WSKALM9 constant (21°C) is added to both alarm and shutdown levels to avoid shutdown due to a transient thermal distribution.

Instrumentation fault logic

Outputs from the two thermocouples located in a same measurement section are compared against each other. If they differ by more than WSKALM8 constant (65.5°C), the high spread software alarm

L30WSA1_ALM is generated and the maximum temperature value is considered for control functions. A thermocouple signal is detected faulty when at least one of the following conditions are verified: Thermocouple output is out of range (-26.5°C, 649°C);

Signal fault detected by hardware diagnostic.

If a thermocouple signal is detected faulty, its value is discarded and temperature value is given by the other thermocouple on the same section.

If two thermocouple signals on the same section are faulty for more then 10s, alarm signal L30WSAF_ALM is generated and shutdown sequence is started (L30WSA_SD).

Water Wash Permissive

All of the average wheelspace temperature values are compared against each other and the highest value is selected. This value is then compared to K69TWW constant (149°C), to provide water wash permissive signal (L69TWW).

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3.9 SEISMIC VIBRATION

DEVICE SUMMARY

39V-1A VE -209 A TURBINE BRG.#1 VIBRATION

39V-1B VE -209 B TURBINE BRG.#1 VIBRATION

39V-2A VE -210 A TURBINE CASING VIBRATION

39V-2B VE -210 B TURBINE CASING VIBRATION

Alarm and trip logic

If the signal coming from one of the four sensors exceeds its alarm level for more then LK39ATD (typically 5s), software common alarm L39VA_ALM is generated (VAH-209, VAH-210 in the P&Id).

If a sensor signal reaches its trip level and maintains this value for more than LK39TTD (typically 0.5s) while a second sensor value is above alarm level, trip L39VT and alarm L39VT_ALM are generated (VAHH-209, VAHH-210 P&Id alarms).

Trip signal L39VT is latched and can be reset with master reset command from the HMI.

If the difference between the two signals of a pair of sensors is higher than the threshold LK39DIFF for more than LK39DFTDT (typically 0.5s), software alarm L39VDIFF_ALM is generated.

Instrumentation fault and disable logic

Sensor readings can be faulty, detected by hardware diagnostic, or disabled, by forcing to 0 the enable input.

If at least one sensor fault is detected for more than LK39FTD time (typically 500ms), alarm L39VF_ALM is generated.

If at least one sensor is disabled, alarm L39VD1_ALM is generated.

When two or more sensors are disabled or detected above alarm threshold, if at least one enabled sensor reaches the trip level for more than LK39TTD (typically .5s), trip L39VT and alarm L39VT_ALM are generated.

If three sensors are faulty or disabled, inhibit to start signal L39VD3 is generated. Also, L39VD3_ALM alarm is generated if master protective signal L4 is low (starting condition).

If two paired sensors are faulty or disabled, L39VD2 shutdown signal and L39VD2_ALM alarm are generated.

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3.10 WATER WASH

DEVICE SUMMARY

20TW-1 XY -407 ON LINE WASHING WATER SOLENOID

VALVE

20TW-2 XY -406 OFF LINE WASHING WATER SOLENOID

VALVE

SOFTWARE DESCRIPTION On line water wash sequence

Water wash cutout conditions:

Turbine start sequence not ended - turbine is not running (L3 is false)

Compressor inlet temperature (CTIM software signal) lower than the threshold LKWCTIM (typically 10°C).

Water wash selection:

On line water wash is selected using HMI pushbutton L83WWON_CPB.

When the turbine start sequence is ended (L3 is true), if the on line water wash is selected and temperature cutout condition is verified, the software alarm L3WCTIM_ALM is generated.

Water wash activation:

If the operator selects on line water wash and temperature cutout condition is not verified, on line water wash sequence is activated. After K83WWZ (typically 3 seconds) the solenoid valve XY -407 (20TW-1) is energized by l20bw2 software output.

Water wash stop:

Water wash is de-activated (and solenoid valve XY -407 (20TW-1) is de-energized) when on line water wash is de-selected due to:

HMI pushbutton L83WWOFF_CPB activation Cut-out condition.

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Off line water wash sequence

Water wash activation enabling conditions:

Master selector not in CRANK mode (L43C is true) Shaft zero speed not detected (L14HR is false) Off line water wash not selected (L43BW is false)

Water wash selection:

Off-line water wash is selected using HMI pushbutton L43BWON_CPB. The selection is detected by L43BW MKVIe signal.

When the water wash is selected, if wheelspaces temperature permissive is not active (L69TWW is false), alarm L30TWW_ALM is generated.

Water wash activation:

If enabling conditions are verified, the water wash sequence is activated when the unit is started (L1X is true).

Activation is detected by L83BW software signal.

Water wash cutout:

Wheelspaces temperature high (L69TWW is false); Master protective signal not activated (L4 is false) Flame detected (L28FDX is true)

HP shaft below crank speed (L14HM is false)

Water wash start:

If all cutout conditions are not verified and water wash sequence is activated (L83BW is true), the IGV open command is generated (L83GVMAX software signal) and the cleaning solution intercept valveXY -406 (20TW-2) is opened by software output l20bw1.

Water wash stop:

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3.11 VENTILATION

DEVICE SUMMARY

FNVF1÷2 --- CENTRIFUGAL VENTILATION FAN

88BA-1÷2 --- VENTILATION FAN AC MOTOR

DVF-1÷6 --- DAMPERS

33ID-1 ZSH -207 A VENTILATION INLET DAMPER OPEN

33ID-2 ZSH -207 B VENTILATION INLET DAMPER OPEN

33OD-1 ZSH -202 A TURBINE COMP. VENTILATION OUTLET

OPEN

33OD-2 ZSH -202 B COUPLING COMP. VENTILATION

OUTLET OPEN 96SV-1A 96SV-1B 96SV-1C PDT -205 A PDT -205 B PDT -205 C

VENTILATION FANS SWITCH-OVER VENTILATION FANS SWITCH-OVER VENTILATION FANS SWITCH-OVER TT-BA-2A TT-BA-2B TT-BA-2C TE -296 A TE -296 B TE -296 C

TURBINE COMPARTMENT INTERNAL TEMP.

33DT-1 ÷ 33DT-10 ZSL -206 A ÷ ZSL -206 J ACCESS DOORS LIMIT SWITCH

Ventilation fan ready to run (L3BT)

The Turbine enclosure ventilation fan ready to run status flag (L3BT) shall be set if all the following conditions are satisfied:

The turbine enclosure inlet fire damper is fully open(33ID-1, 33ID-2) The turbine enclosure outlet fire dampers are fully open (33OD-1, 33OD-2)

This condition is checked at the automatic start of fans and enables manual operation.

Ventilation cutoff condition (L4BT):

The turbine enclosure ventilation cutoff status flag (L4BT) shall be set if at least one of the following conditions are satisfied:

The turbine enclosure fire detected trip, detected by F&G system interface signal l45ftt The turbine enclosure CO2 discharged trip, detected by F&G system interface signal l63cpd The turbine enclosure inlet air gas detect trip, detected by F&G system interface signal l45hft.

If cutoff condition is verified, the running fans are stopped, regardless any manual or automatic request.

Main/Stand-by fan selection

Main and Stand-by fan selection is done by HMI dedicated pushbutton (through signal L43BT_CMD).

Main fan start/stop logic

The main fan request signal (L4BTON) is active during ventilation operative period, that is from the turbine starting sequence initiated (L1X) up to the turbine enclosure cool-down end.

Functional Description Alrar

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CONTROL SYSTEM

FUNCTIONAL DESCRIPTION

N. SOM5461188 /4

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TABLE OF CONTENTS

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START/STOP SEQUENCING

1.1

READY TO START

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1.2

AUXILIARIES STARTING

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1.3

CRANK

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1.4

IGNITION AND WARMUP

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1.5

ACCELERATION TO OPERATIVE SPEED

Turbine and Auxiliaries

Sequences

External

Sequences

Process

Sequences

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1.6

COMPLETE SEQUENCE AND SYNCRONIZATION

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1.7

LOAD MANAGEMENT

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1.8

SHUTDOWN REQUEST

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1.9

TRIP REQUEST

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1.10 COOLDOWN SEQUENCE

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1.11 SHUTDOWN AND TRIP SEQUENCE

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2

STATUS DEFINITION

2.1

AUXILIARIES START READY

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2.2

START PASSED

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2.3

CRANK READY

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2.4

FIRE READY

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2.5

LOAD READY

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2.6

SYNCRONIZATION PERMISSIVES

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2.7

SHUTDOWN

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2.8

TRIP

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3

AUXILIARIES SEQUENCING

3.1

_{N. SOM5461188 /4}