Functional Description Alrar

NuovoPignone

CLIENTE – CUSTOMER SONATRACH LOCALITA' - PLANT LOCATION ALGERIA

FIRENZE COMMESSA - JOB

1705713-14-15

IMPIANTO – PLANT ALRAR POWER PLANT EXTENSION PROJECT

TITOLO - TITLE

AS-SHIPPED

4

REVISED SH. 1, 6 , 8, 15 ,16, 50 ,55 , 56, 57 FOR AS-SHIPPED

RADHIKA J.

Giovanardi L.

Seghi A.

15/03/10

3

REVISED FOR AS-SHIPPED

RADHIKA J.

GIOVANARDI L..

SEGHI A.

24/12/09

2

GENERAL REVISION

RADHIKA J.

LUSINI S.

SEGHI A.

12/11/09

1

GENERAL REVISION

RADHIKA J.

LUSINI S.

SEGHI A.

08/07/09

ISSUE

PRITAM P.

ORGERO F.

SEGHI A.

30/04/09

0 RE

DESCRIZIONE - DESCRIPTION

Nuovo Pignone S.p.A., all rights reserved

PREP'D

CONT-CHK'D

APP-APPR'D

ITEM

N. SOM5461188 /4 LINGUA-LANG.

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DATA -

SOSTITUISCE IL - REPLACES SOSTITUITO DA - REPLACED BY

Electronically approved draw. GE NuovoPignone Internal DT-'N'

CONTROL SYSTEM FUNCTIONAL DESCRIPTION

NuovoPignone

INDEX

FIRENZE

TABLE OF CONTENTS START/STOP SEQUENCING .................................................................................................................... 5 1.1 READY TO START 5

2

3

1.2

AUXILIARIES STARTING

6

1.3

CRANK

7

1.4

IGNITION AND WARMUP

8

1.5

ACCELERATION TO OPERATIVE SPEED

9

1.6

COMPLETE SEQUENCE AND SYNCRONIZATION

10

1.7

LOAD MANAGEMENT

11

1.8

SHUTDOWN REQUEST

12

1.9

TRIP REQUEST

13

1.10

COOLDOWN SEQUENCE

14

1.11

SHUTDOWN AND TRIP SEQUENCE

15

STATUS DEFINITION ....................................................................................................................... 16 2.1 AUXILIARIES START READY 16 2.2

START PASSED

18

2.3

CRANK READY

19

2.4

FIRE READY

20

2.5

LOAD READY

21

2.6

SYNCRONIZATION PERMISSIVES

22

2.7

SHUTDOWN

23

2.8

TRIP

24

AUXILIARIES SEQUENCING............................................................................................................ 26 3.1 MINERAL LUBE OIL 26 3.2

OIL VAPOUR SEPARATOR

29

3.3

LUBE OIL HEATER

30

3.4

LUBE OIL COOLER

31

3.5

HYDRAULIC OIL<1>

33

3.6

STARTING SYSTEM

35

3.7

HYDRAULIC RATCHETING

37

3.8

WHEELSPACES

39

3.9

SEISMIC VIBRATION

40

3.10

WATER WASH

41

3.11

VENTILATION

43

3.12

INLET AND FILTRATION

46

3.13

FUEL GAS<1>

47 ITEM

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NuovoPignone FIRENZE

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

3.19

EJECTOR LOGIC <4>

55

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LIST OF ABBREVIATIONS: MKVIe DCP MCC QMT PMS F&G DCS UCP GCPP GEP GT CRS HMI ARS PRS FSNL SHT

MARK VIe DIRECT CURRENT PANEL MOTOR CONTROL CENTER MEDIUM VOLTAGE PANEL POWER MANGEMENT SYSTEM FIRE AND GAS DISTRIBUTED CONTROL SYSTEM UNIT CONTROL PANEL GENERATOR CONTROL AND PROTECTION PANEL GENERATOR EXCITATION PANEL GAS TURBINE CUSTOMER READY TO START<2> HUMAN MACHINE INTERFACE <2> AUXILLIARY READY TO START <2> PROCESS READY TO START <2> FULL SPEED NO LOAD <2> SHEET <2>

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

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START/STOP SEQUENCING 1.1

READY TO START

External Sequences

Process Sequences

Turbine and Auxiliaries Sequences Start Sequence Yes

F from Shutdown sequence

Shutdown or Trip ? active

SHT 10 Process ready To start

H

No

No

Auxiliaries ready to start (L3ARS) includes the following software Cumulative signals - Miscellaneous (L3ARS_MSC)

GT zero speed ? detected

from Trip sequence

SHT 13

- Lube Oil(L3ARS_LO) - Hydraulic Ratchet (L3ARS_RAT) -Enclosure Vent (L3ARS_ENC) -Fire&Gas monitor (L3ARS_FGM )

Yes

AND

Customer ready to start

3 CRS(2) =1

AND

L3PRS

XS-120 (from DCS)

No

- Fuel gas(L3ARS_FG) OR Water wash on Selected (L43BW) See 2.1 “AUXILIARIES START READY” for details

Aux. permissive OK?

Yes (L3ARS (2))

-

No

Core Engine and diagnosti OK? c Yes - Off

NOTES:

Master Selector(1) - Crank -Fire - Manual - Auto - Remote

(1) HMI Software switch (2) Internal Software Signal

Unit Ready to Start (L3 RS=1 (2))

A

SHT 6

Figure 1 - Ready to start ITEM 3


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1.2

AUXILIARIES STARTING

External Sequences

Process Sequences

Turbine and Auxiliaries Sequences A

Remote

SHT 5

Manual

Master Sel

No Start Push Button on HMI?

And

Start Command XS-116 ( From DCS)

Yes

Yes

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

Mineral Lube Oil system (1) activated

N o

Oil mist eliminator started

Auxiliarie s ? Start Passed

NOTES (1) Can be already activated ( seecooldown sequence )

Yes

Ventilation System activated

Auxiliaries Start Passed (L3ASP) include s the following software cumulative signals - : Oil( L3ASP_ LO) Lube Ventilation(L3ASP_ENC ) See 2.2 “START PASSED” for details.

Master protective signal enabled (L4= 1(3) )

(2) HMI software switch .

(3) Internal Software Signal

<3> <4>

Open Fuel Block Valve 20FB-2(SOV01002B) Close Fuel vent Valve 20FV-1(SOV01001A ) Close Fuel vent Valve 20FV-2(SOV01001B)

B

SHT 7

Figure 2 - Auxiliaries starting

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1.3

CRANK E xternal Sequences

Process S equences

Turbine and Auxiliaries Sequences B

SHT 6

Off-line water wash sel. on HMI

Yes

Water Wash system Start (1) No

End of sequence

Auxiliaries Ready to crank (L3ARC) includes the following software cumulative signals: -Process (L3PRC) -Lube Oil (L3ARC_LO) -Fuel Gas (L3ARC_FG )

No Aux. Ready to crank?

See 2.3 “CRANK READY” for details

Yes -Ratchet system activation -Starting system activation No GT speed above zero speed? Yes Ratchet system de-activation No

GTspeed above Crank speed? NOTES : (1) Note that if water wash is selected, ready to start and start passed conditions change from the above described

Yes CRANK

No

Crank Time Elapsed?

Yes C

SHT 8

Figure 3 –Crank ITEM 3


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1.4

IGNITION AND WARMUP

E x te r n a l S equences

P ro c e s s S equences

T u r b in e a n d A u x ilia r ie s S equences C

SHT 7 C ra n k

M a s te r s e l e c to r (2 ) -

No

A u x ilia r ie s R e a d y to f ir e A R F) I n c lu d e s th e f o llo w i n g s o f tw a r e c u m u la tiv e s ig n: a ls H y d r a u lic O( ilL 3 A R F_ H Y D) F u e l G a(sL 3 A R F_ F G ) - W a t e r W a s h( L 3 A R F_ W W )

F ir e M anual A u to R e m o te

(L3

A. u x r efiar d y to ? e

S e e2 . 4 “ F IR E R E A D Y ” f o r d e t.a ils

Y es No C o r e E n g in e r e a d y t o f ir e?

Y es I g n itio n T r a s f o r m e r c o m m a n( d L 2 T V X= 1 (3 )) 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 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) No

F la m e D e te c te d

F ir in g tim e e la p s e d?

No

( L 2 8 F D X) ?

Y es Yes -

L u b e O il C o o lin g s y s te m a c t iv a t io n

M a s te r S e le c t o r( 2 ) N O T E S: ( 1 ) T u r b in e r e m a in s in C R AN K m od . eT o s t a r t a n e w f ir in g a t te m p t, t h e o p e r a to r h a s to m o v e t e m p o r a r i ly m a s t e r s e le c t o r i n C R A N K p o s i tio n (2 ) H M I s o f tw a r e s w it . ch ( 3 ) I n t e r n l S o f tw a r e S ig n a l

- F ire - M anual - A u to

- R e m o te

W ARMUP

No W a r m u p t im e e la p s e d?

Y es G

D

SHT 9

To

D is a b le i g n it io n t r a n s fo r m e r 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 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) O ff s 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 > 2 0 F V - 2 ( S O V 0 1 0 0 1B ) < 1 > < 4 >

S h u td o w n se que nce

End

(1 )

SH T 15

Figure 4 - Ignition and warmup 4

R E V IS E D W H E R E S H O W N A S < 4 >

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1.5

ACCELERATION TO OPERATIVE SPEED External Sequences

Process Sequences

Turbine and Auxiliaries Sequences SHT 8

D

Master selector (2)

-Fire

-Manual -Auto -Remote

ACCELERATING No

Turbine speed above self sustaining speed?

Yes

Starting system de-activated No

Turbine speed above min operative speed? GCPP Excitation enabled

(41 FX ) XS-212

Yes

Auxiliary lube oil pump de-activation (1) NOTES: (1) Mechanical Pump is operative (2) HMI software switch.

E

SHT 10

Figure 5 - Acceleration to operative speed

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1.6

COMPLETE SEQUENCE AND SYNCRONIZATION External Sequences

Process Sequences

Turbine and Auxiliaries Sequences SHT 9

E

No

Auxiliaries Ready to Load (L3ARL) software signal details are described in 2.5 “LOAD READY”

Aux. Ready to load?

Yes Turbine start sequence endedturbine is running (L3=1(1) )

Note (1) Software Signal

No GT speed = 100.3%? Yes FSNL

GCPP Turbine ready to syncronize

(52SX) XS-209 No

Off GCPP Sync. selector

Auto

Syncronization permissives OK?

(GCPP-AUTO) XS-202

Manual

For details see 2.6 “SYNCRONIZATION PERMISSIVES”

Yes Auto sync. In progress

GCPP

No

GCPP manual syncronization Auto sync. OK?

GCPP generator circuit breaker close command

(25 ) XS-215

No

Resynch. requested?

Yes

Yes HMI Resynch. push button

F

SHT 11 SHT 5

Figure 6 - Complete sequence and Syncronization

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1.7

LOAD MANAGEMENT External Sequences

Turbine and Auxiliaries Sequences F

PMS HMI Master selector in Remote position

Master Selector (1) in Remote position

Yes

( LOC -REM) XS-222

SHT 10

No

HMI ISO/ DROOP mode selection

PMS ISO/DROOP mode selection

ISO/ DROOP XS-219 ISO/DROOP mode selected

Active Power Raise

PMS-RS) XS-175

Active Power Output increased/decreased through to Raise/ Lower on PMS

PMS Active Power Lower

PMS Reactive Power Raise

PMS Reactive Power Lower

Master Selector (1)

Remote

PMS

(PMS-LS) XS-176

Auto

Manual

Active Power Output increased/decreased through to Raise/Lower push buttons on HMI

Active Power Output according to Base Load or Preselected Load input on HMI

(PMS- R-RF) XS-224

GCPP Reactive Power Output increased/ decreased through (PMS- R-LS) to Raise/Lower on PMS XS-225

End Sequence

Notes: (1) HMI software switch.

Figure 7 – Load Management

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1.8

SHUTDOWN REQUEST

External Sequences

Process Sequences

Turbine and Auxiliaries Sequences Start sequence

DCS DCS Stop Command

(DCS- STOP)

PMS PMS Stop Command

Master Selector (1)

-Remote

XS-115

Yes

Customer STOP ?

OR

(PMS-94X)

G

No

Generator Lockout Relay de-energized

Yes

Stop push button on HMI

HMI STOP?

SHT 15

XS-227

No

Auxiliaries shutdown request includes requests from the following systems: -Wheelspaces (L94ASHD_WHE) -Seismic Vibration (L94ASHD_VIB) -Inlet Air and Filtr. (L94ASHD_IAF) - Ventilation L 3ASP_ENC ) GCPP See 2.7 “SHUTDOWN” for details.

GCPP

-Crank -Fire -Manual -Auto

Aux.STOP ?

No

(K86G2) XS-182

Process STOP ?

AND

TRUE

Yes

L94PSHD (3)

Yes

G

SHT 15 No

Core Engine STOP(2)?

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.

Yes

No

(3) Software Signal

End sequence

Figure 8 - Shutdown request

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1.9

TRIP REQUEST

External Sequences

Process Sequences

Turbine and Auxiliaries Sequences Start sequence

GCPP Trip to driver from protections

(K4-TRIP)

GCPP Trip?

Yes

XS-183 No

DCS Customer trip command

Customer Trip?

(L4CTRIP) XS-177 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)

No Yes

Aux Trip?

Yes

No See 2.8 “TRIP” for details. Core Engine Trip?

Yes

H

SHT 15 SHT 5

No

End sequence

Figure 9 - Trip request

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1.10 COOLDOWN SEQUENCE External Sequences

Process Sequences

Turbine and Auxiliaries Sequences I

SHT 15

No GT zero speed reached?

Yes

Hydraulic Ratchet system start

No Cooldown timer expired? Yes L62CD=1

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

End Sequence

Figure 10 – Cooldown Sequence

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1.11 SHUTDOWN AND TRIP SEQUENCE External Sequences

Process Sequences

Turbine and Auxiliaries Sequences G SHT

GCPP

Off Skid Valves Close Fuel gas Block valves 20FG-1( FV- 337 ) &20FG- 2( FV- 338) Open Fuel gas Vent valves 20VG- 1( FV- 109)

( 94X)

Turbine Normal Stop

XS- 211

12

Shutdown in Progress L 94X(3)

PMS Turbine Normal Stop

( PM S - 94X) L3= 0(3)

XS- 227

UNLOADING No GCPP Gen . Circuit Breaker opening command

Reverse Power ? (1) ( 52GT) XS- 216

Yes RELOADING

Yes

HMI ? START

No

No

From Sht 1 3

Shutdown sequence aborted

GT under minimum speed operative ?

H

Yes

Unit Summary Trip 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)

GCPP Trip from driver

DECELERATING

L 14 HS= 0(3) - Mineral Lube Oil system d activate L4=0(3)

4X- 32 XS- 210

No GT minimum operative speed ?

No

FlameOut ? OR

Yes L4= 0(3)

Yes - Mineral Lube Oil system activated

Ventilation Timer activated No

Lube Oil Cooler timer activated No

No Flame Out? Yes NOTES : (1) MKVIe Reverse Power Limit to be set higher Then GCPP Reverse power Protection . value (2) TNH– Turbine Speed . (3 ) Software Signal

Timer expired? Yes - Ventilation System Stop

OR

L 62 CD= 0(3) I

Offskid Valves Close Fuel Block Valve 20FB-2( SOV 01002 B) Open Fuel Vent Valve 20FV-1( SOV 01001A) 20FV-2( SOV 01001B)<4>

Timer expired ? Yes Lube oil Cooler system Stop

End

To Cooldown

SHT14

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 LOGIC

JOB TAG (GE TAG)

TAG

NOT

L71QL_W

NOT

LT -301 (96QL1)

NOT

l27qel

NOT

XS -101 (27QE)

NOT

l49qe

NOT

XS -102 (49QE)

L26QN_W

NOT

TE -307 (LT-OT-1)

NOT

l49hr1a

NOT

XS -106 (49HR)

NOT

L27hr

NOT

XS -105 (27HR)

NOT

L33EA1AO<4>

ZSH -216 (---) <4>

L33EA1BO<4>

ZSH -217 (---) <4>

L26BA¹

NAN D

TE -296 A (TT-BA2A) TE -296 B (TT-BA2B) TE -296 C (TT-BA2C)

NOT

ZSL -206 A (33DT-1) -ZSL -206 J (33DT10)

L33dtc<2>

l33ido1¹ l33ido2¹

NOT NOT

ZSH -207 A (33ID-1) ZSH -207 B (33ID-2)

l33odo1¹

NOT

ZSH -202 A (33OD-1)

l33odo2¹

NOT

ZSH -202 B (33OD-2)

l33cb1o<2> l33cb2o<2>

ZSH -201 (33CB-1) ZSH -200 (33CB-2)

NOT

L63FGH_W 1

NOT

NOT

L63FGL_W 2<2>

NOT

L33vg2_c<2>

NOT

1 2

4

L33P2

NAN D

l45hta

NOT

SYSTEM

PT -109 A (96FG-2A) PT -109 B (96FG-2B) PT -109 C (96FG-2C) PT -109 A (96FG-2A) PT -109 B (96FG-2B) PT -109 C (96FG-2C) ZSL -100 (33VG-2) ----XS -167 (45HTA)

LUBE OIL TANK LEVEL LOW LUBE OIL EMERGENCY PUMP UNDERVOLTAGE ALM

MINERAL LUBE OIL MINERAL LUBE OIL

LUBE OIL EMERGENCY PUMP OVERLOAD ALARM

MINERAL LUBE OIL

LUBE OIL TANK TEMP LOW <2> HYDRAULIC RATCHET PUMP OVERLOAD ALARM HYDRAULLIC RATCHET PUMP MOTOR MINIMUM VOLTAGE AIR EIECTOR CONTROL VALVE VALVE OPEN<4> AIR EIECTOR CONTROL VALVE VALVE OPEN <4>

MINERAL LUBE OIL HYDRAULIC RATCHETING HYDRAULIC RATCHETING COOLING & SEALING AIR SYSTEM<4> COOLING & SEALING AIR SYSTEM<4>

TURBINE COMPARTMENT INTERNAL TEMP.

VENTILATION

TURBINE ENCLOSURE ACCESS DOORS CLOSED GEARBOX ENCLOSURE ACCESS DOOR CLOSED GEARBOX ENCLOSURE ACCESS DOOR CLOSED VENTILATION INLET DAMPER OPEN VENTILATION INLET DAMPER OPEN TURBINE COMP. VENTILATION OUTLET OPEN

VENTILATION VENTILATION VENTILATION VENTILATION VENTILATION VENTILATION

COUPLING COMP. VENTILATION OUTLET OPEN

VENTILATION

VA2-1 ANTISURGE VALVE OPEN VA2-2 ANTISURGE VALVE OPEN

VENTILATION

INTERSTAGE FUEL GAS PRESSURE HIGH

FUEL GAS

INTERSTAGE FUEL GAS PRESSURE LOW

FUEL GAS

WARM-UP LINE VENT VALVE FUEL BLOCK VALVE AND FUEL VENT VALVE IN CORRECT SEQUENCE TURBINE ENCLOSURE GAS DETECTED ALARM

FUEL GAS VALVES SEQUENCING FIRE FIGHTING & GAS DETECTION

Start permissive enabled after line depressurization. Start permissive enabled after line depressurization. REVISED WHERE SHOWN AS <4>

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SOFTWARE TAG LOGIC

JOB TAG (GE TAG)

TAG

DESCRIPTION

SYSTEM

AG

NOT

l33cr_a1

NOT

WSL -703 (33CR-A)

NOT

l33cr_b³

NOT

WSL -706 (33CR-B) ZSH -702 A (33CP4A)

l33cp_a <3> l33cp_b <3>

AND

NOT

l33cp_c

NOT

XS -160 (33CP-1)

NOT

l86fg

NOT

XS -172 (86FG)

NOT

l43cp_i

NOT

L43ffb<2>

ZSH -702 B (33CP4B)

HS -232 (43FFB-1)

NOT

l86vmn<2>

NOT

NOT

l86ps

AND

XS -233 (86VM) XS -154 (86PS-1)

CO2 BOTTLE LIMIT SWITCH BANKA COMMON ALARM CO2 BOTTLE LIMIT SWITC BANK-B COMMON ALARM FIRE FIGHTING CO2 DISCHARGE VALVES OPEN FIRE FIGHT.CO2 DISCH.VALVES CLOSED ALM FIRE & GAS SYSTEMS FAULT FIRE FIGHTING ELECTRIC DISCHARGE DISABLED ALARM FIRE FIGHTING SYST. MANUAL SELECTOR VIBRATION MONITORING SYSTEM FAULT 24 VDC POWER SUPPLY FAILURE 110VDC/24VDC

FIRE FIGHTING & GAS DETECTION FIRE FIGHTING & GAS DETECTION FIRE FIGHTING & GAS DETECTION FIRE FIGHTING & GAS DETECTION FIRE FIGHTING & GAS DETECTION FIRE FIGHTING & GAS DETECTION FIRE FIGHTING & GAS DETECTION FIRE FIGHTING & GAS DETECTION VIBRATION MONITOR

UCP

XS -121 (86PS-2) l27mc1n

XS -152 (27MC) XS -155 (74X-MCC)

NOT

l80x

NOT

XS -108 (DCP-80X)

NOT

l30ra

NOT

XS -110 (DCP-30RA)

NOT

l30rb

NOT

XS -109 (DCP-30RB)

NOT

XS -111 (DCP-BD)

NOT NOT

1

l3comm_io<2> l86mp

NOT

MCC VOLTAGE NORMAL DRAWERS TRIP COMMON ALARM(K74X) MINIMUM BATTERY VOLTAGE ALARM DCP-RECTIFIER 'A' COMMON ALARM DCP-RECTIFIER 'B' COMMON ALARM DCP-BATTERY DISCHARGING I/Os pack communicating Master Protective Startup Lockout

MCC MCC DCP DCP DCP DCP

If the corresponding CO2 bottles bank is selected through selector HS-700 (43HS-1). ITEM

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2.2

START PASSED

SOFTWARE TAG LOGIC

TAG

JOB TAG (GE TAG) LOGIC

TAG

NOT

XS -135 (52QA) XS -133 (52HQ)<1>

l52qa NOT

L52hq L52qv

XS -151 (52QV)

NOT

L63QA2L_W

NOT

NOT

L63QT

NOT

l52bt11 OR

XS -124 (52BA-1) OR

l52bt2¹

NOT

PT -310 A (96QT2A) PT -310 B (96QT2B) PT -310 C (96QT2C) PT -310 A (96QT2A) PT -310 B (96QT2B) PT -310 C (96QT2C)

L63BT_W¹

XS -127 (52BA-2)

NOT

PDT -205 A (96SV-1A) PDT -205 B (96SV-1B) PDT -205 C (96SV-1C)

L3QE_TEST<2>

1

DESCRIPTION

SYSTEM

LUBE OIL AUXILIARY PUMP RUNNING HYDRAULIC OIL AUXILIARY PUMP RUNNING LUBE OIL VAPOUR SEPARATOR #1 RUNNING

MINERAL LUBE OIL HYDRAULLIC OIL

LUBE OIL HEADER PRESSURE LOW

MINERAL LUBE OIL

LUBE OIL HEADER PRESSURE LOW LOW

MINERAL LUBE OIL

TURB.ENCLOSURE VENT.FAN #1 RUNNING TURB.ENCLOSURE VENT.FAN #2 RUNNING

MINERAL LUBE OIL

VENTILATION VENTILATION

TURBINE ENCLOSURE PRESSURE LOW

VENTILATION

LUBE OIL EMERGENCY TEST PASSED

VENTILATION

Bypassed if water wash is selected (software signal L83BW) ITEM

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2.3

CRANK READY

SOFTWARE TAG LOGIC

NOT

TAG

L71QL_W


TAG

NOT

LT -301 (96QL1)

l52qa NOT

NOT

NOT

XS -135 (52QA)

L63QA2L_W

NOT

L26QN_W

NOT

L63FGL_W

1

L26FGL_W 1

NOT

NOT

PT -310 A (96QT-2A) PT -310 B (96QT-2B) PT -310 C (96QT-2C) TE -307 (LT-OT-1) PT -108 (96FG-1) TE -104 A (TG-FG-1) TE -104 B (TG-FG-2) TE -104 C (TG-FG-3)

L43C 1

L33VG2_C L3PRC

ZSL -100 (33VG-2) --NAND NOT

L52hq

1

--XS -133 (52HQ) <1>

DESCRIPTION

SYSTEM

LUBE OIL TANK LEVEL LOW LUBE OIL AUXILIARY PUMP RUNNING

MINERAL LUBE OIL MINERAL LUBE OIL

LUBE OIL HEADER PRESSURE LOW LUBE OIL TANK NORMAL UPSTREAM SRGC VALVE PRESSURE LOW

MINERAL LUBE OIL MINERAL LUBE OIL FUEL GAS

FUEL GAS TEMPERATURE INLET LOW MASTER SELECTOR IN CRANK POSITION WARM-UP LINE VENT VALVE FUEL BLOCK VALVE AND FUEL VENT VALVE IN CORRECT SEQUENCE HYDRAULIC OIL AUXILIARY PUMP RUNNING

FUEL GAS

FUEL GAS FUEL GAS VALVES SEQUENCING HYDRAULLIC OIL

Bypassed if water wash is selected (software signal L83BW)

ITEM 3


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2.4

FIRE READY SOFTWARE TAG

LOGIC

1

TAG


TAG

NOT

PT -324 (96HQ-1)

NOT

L63HQ1L_W

NOT

L43BW

-

NOT

L83BW

-

NOT

L63FGL_W

NOT

PT -108 (96FG-1) TE -104 A (TG-FG-1) TE -104 B (TG-FG-2) TE -104 C (TG-FG-3)

NOT

L26FGL_W

NOT

NOT

l33vg2_c l27gcpp1

NOT

ZSL -100 (33VG-2) XS -194 (27GCPP)

NOT

l86g1¹

NOT

XS -184 (K86G1)

NOT

l8vtm¹

NOT

XS -198 (K-8VT-M)

NOT

l86g2¹

XS -182 (K86G2)

NOT

l8vtp¹

XS -197 (K-8VT-P)

NOT

l27pr¹

NOT

XS -193 (27PR)

NOT

l8vtavr¹

NOT

XS -199 (K-8VT-AVR)

NOT

l8vtb1¹

NOT

XS -200 (K-8VT-B1)

NOT

l26tw¹

NOT

TSHL -434 (26TW-1)

DESCRIPTION

SYSTEM

HYDRAULIC OIL HEADER PRESSURE LOW WATER WASH ON SELECTED TURBINE/COMPRESSOR WATER WASH CONTROL UPSTREAM SRGC VALVE PRESSURE LOW FUEL GAS TEMPERATURE INLET LOW WARM-UP LINE VENT VALVE GCPP POWER WATCH DOG GENERATOR CKT BREAKER 52G LOCKOUT RELAY METERING REFERENCE VOLTAGE-FAULT GENERATOR LOCK OUT RELAY PROTECT REFERENCE VOLTAGE FAULT PROTECTION RELAY COMMON FAULT AVR REFERENCE VOLTAGEFAULT BUS REFERENCE VOLTAGE FAULT ON/OFF-LINE WASHING TANK HEATER CONTROL

HYDRAULIC OIL WATER WASH WATER WASH FUEL GAS

FUEL GAS FUEL GAS GCPP GCPP GCPP GCPP GCPP GCPP GCPP GCPP GCPP

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

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2.5

LOAD READY

SOFTWARE TAG LOGIC

NOT

NOT

TAG


l52qa

NOT

l72qez

NOT

L52hq

NOT

DESCRIPTION

SYSTEM

LUBE OIL AUXILIARY PUMP RUNNING

MINERAL LUBE OIL MINERAL LUBE OIL HYDRAULLIC OIL

TAG

XS -135 (52QA) XS -100 (4QE) XS -133 (52HQ) <1>

L3prl<2>

LUBE OIL EMERGENCY PUMP STOP COMMAND HYDRAULIC OIL AUXILIARY PUMP RUNNING PROCESS READY TO LOAD

PROCESS

ITEM 3


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2.6

SYNCRONIZATION PERMISSIVES SOFTWARE TAG

LOGIC

TAG

LOGIC LOGIC

l43gcpp-a<3> l25-enab<3>

Gen. K25a relay enable status

l43avrlc

XS -196 (AVR-43X-A) NOT

l3gg NOT

l52gx1

XS -195 (AVR-43-LC) XS -187 (3GG-25A)

NOT

XS -188 (K52GX-1A)

l41x

XS -192 (41X-1)

NOT

l8vtm

NOT

XS -198 (K-8VT-M)

NOT

l8vtp

NOT

XS -197 (K-8VT-P)

NOT

l8vtavr

NOT

XS -199 (K-8VT-AVR)

NOT

l8vtb1

NOT

XS -200 (K-8VT-B1)

NOT

lavr43lc<3> l43gcpp-m<3>

NOT

l86g1<3> l25m<3> lavr43xa<3>

NOT NOT

NOT NOT NOT

SYSTEM

AVR AUTOMATIC CONTROL SELECTED AVR LOCAL CONTROL SELECTED AUTOMATIC SYNCHRONISING ENABLED TO UCP GEN CIRCUIT BREAKER 52G CLOSED EXCITATION CONTACTOR CLOSED METERING REFERENCE VOLTAGE-FAULT PROTECT REFERENCE VOLTAGE -FAULT AVR REFERENCE VOLTAGEFAULT BUS REFERENCE VOLTAGE FAULT Gen. AVR local control selected Gen.GCPP selector in manual mode Gen. Circuit Breaker lockout relay Gen. Manual sync. In progress Gen. AVR automatic control selected Gen.GCPP selector in auto mode

l43avr NOT

DESCRIPTION TAG

NOT

GCPP GCPP GCPP GCPP GCPP GCPP GCPP GCPP GCPP GCPP GCPP GCPP GCPP GCPP GCPP GCPP

ITEM 3


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2.7

SHUTDOWN

SOFTWARE TAG LOGIC

TAG

L30WSA_SD1


TAG

OR

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

L63TF L94gshd<2> L39vd2<3>

PDAHH252 (26CT + K86G2) VE -209 A (39V-1A) VE -209 B (39V-1B) VE -210 A (39V-2A) VE -210 B (39V-2B)

DESCRIPTION

SYSTEM

WHEELSPACE TEMPERATURE HIGH HIGH SHUTDOWN

WHEELSPACE

WHEELSPACE TEMPERATURE HIGH ALARM1

WHEELSPACE

TURB.INLET FILTER DIFFERENTIAL PRESSURE HIGH HIGH MEDIAN SHUTDOWN LOGIC GENERATOR SHITDOWN COMMAND TURBINE BRG.#1 VIBRATION TURBINE CASING VIBRATION

INLET AND FILTRATION GCPP CONTROL & PROTECTION

1

Shutdown is started if wheel space temp. is detected high for 24 hours Shutdown is started if ventilation pressure is not restored within 30s.

2

ITEM 3


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2.8

TRIP

SOFTWARE TAG LOGIC

TAG

JOB TAG ( GE TAG) LOGIC

L26QT

TAHH-305

L63QTX

PALL-310

L63QVT

PDAHH-300

L4QE_TRP 86DS2

L3SMTX

NOT

L26BT

TAHH- 296

l45htt

XS -168 (45HTT)

l45hft

XS -166 (45HFT)

l45ftt

XS -163 (45FTT)

HS -221 (5ESD-1)

TURBO UNIT EMERGENCY SHUTDOWN BUTTON

l5esdv2

HS -220 (5ESD-2)

TURBO UNIT EMERGENCY SHUTDOWN BUTTON

XS -153 (5ESD-1) 3

EMERGENGCY SHUTDOWN PB ON UCP

l4_fb3

NOT

l26gbtx4

PSS-TRIP XS -183 (K4-TRIP) XS -210 (4X-32) TAHH-374 TAHH-370

L39gvtx<3> L39gvtx<3>

CO2 DISCHARGE ACTIVATED

CONTROL SYSTEM FAULT TRIP TRIP COMMAND FROM PSS TRIP DRIVER FROM PROTECTION TRIP FROM DRIVER GENERATOR BEARINGS METAL TEMPERATURE HIGH TRIP

XAHH - 351 (XAHH-351) XAHH -352 (XAHH-352)

GB HS SHAFT RADIAL VIBRATION TRIP GB LS SHAFT RADIAL VIBRATION TRIP

XAHH -354 (XAHH-354)

GB HS SHAFT RADIAL VIBRATION TRIP

XAHH -353 (XAHH-353) <3> XAHH-355 (XAHH -355) XAHH-356 (XAHH -356) VAHH-352 (VAHH -352) VAHH-353 (VAHH -353) ZAHH -351 (ZAHH-351) TE -211 A (TT-XD-1) --TE -211 M (TT-XD-13)

4

MINERAL LUBE OIL MINERAL LUBE OIL MINERAL LUBE OIL MINERAL LUBE OIL STARTING DEVICE

l5esdv1

l4tesd l4prot4

3

LUBE OIL HEADER TEMP HIGH HIGH MEDIAN TRIP LOGIC LUBE OIL PRESSURE LOW LOW MEDIAN TRIP LOGIC LUBE OIL TANK PRESSURE HIGH HIGH TRIP LUBE OIL EMERGENCY PUMP TRIP SIGNAL STARTING DEVICE TRIP LOGIC TURBINE COMPARTMENT TEMPERATURE HIGH HIGH TRIP TURBINE ENCLOSURE GAS DETECTED TRIP TURBINE AIR FILTER GAS DETECT.TRIP TURBINE ENCLOSURE FIRE DETECTED TRIP

PAHH-712

4

2

SYSTEM

l63cpd

L3SFLT

1

DESCRIPTION

TAG

GB LS SHAFT RADIAL VIBRATION TRIP GENERATOR RADIAL VIBRATION TRIP GENERATOR RADIAL VIBRATION TRIP GEN. SEISMIC VIBRATION CUMULATIVE TRIP GEN. SEISMIC VIBRATION CUMULATIVE TRIP GEAR BOX LS SHAFT AXIAL DISP. TRIP EXHAUST TEMPERATURE THERMOCOUPLE

VENTILATION FIRE FIGHTING & GAS DETECTION FIRE FIGHTING & GAS DETECTION FIRE FIGHTING & GAS DETECTI FIRE FIGHTING & GAS DETECTION ENCLOSURE EMERGENCY SHUTDOWN ENCLOSURE EMERGENCY SHUTDOWN UCP EMERGENCY SHUTDOWN UCP PROTECTIONS PSS GCPP GCPP BEARING TEMPERATURE MONITOR BN BN BN

BN BN BN BN BN BN CONTROL & PROTECTION

Trip signal enabled if no flame is detected (NOT L28FDX). Trip enabled if the turbinie shaft speed is below minimum operative speed (95% of rated speed). UCP emergency shutdown pushbutton has double contacts; l5esd1 signal is inverted. Signals cumulated in Process shuitdown software signal. ITEM

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SOFTWARE TAG LOGIC

NOT

TAG

L28FDT

JOB TAG ( GE TAG) LOGIC

TAG

NOT

BE -200 P (28FD-2P) 1 BE -201 P (28FD-3P) BE -202 P (28FD-7P) BE -203 P (28FD-8P) SE -200 A (77NH-1) 2 SE -200 B (77NH-2) SE -200 C (77NH-3) XAHH -355 (XAHH-355) XAHH -356 (XAHH-356) VE -209 A (39V-1A) VE -209 B (39V-1B) VE -210 A (39V-2A) VE -210 B (39V-2B)

L39vt<2>

1 2 3 4

DESCRIPTION

SYSTEM CONTROL & PROTECTION

FLAME DETECTORS

CONTROL & PROTECTION

MAGNETIC SPEED PICK UP GENERATOR RADIAL VIBRATION TRIP GENERATOR RADIAL VIBRATION TRIP TURBINE BRG.#1 VIBRATION TURBINE CASING VIBRATION

BN BN CONTROL & PROTECTION

Trip signal enabled if no flame is detected (NOT L28FDX). Trip enabled if the turbinie shaft speed is below minimum operative speed (95% of rated speed). UCP emergency shutdown pushbutton has double contacts; l5esd1 signal is inverted. Signals cumulated in Process shuitdown software signal.

ITEM 3


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3 AUXILIARIES SEQUENCING 3.1

MINERAL LUBE OIL

3.1.1 DEVICE SUMMARY DEVICE NAME TL-1 PL-1 PL-2 PL-3 88QA 88QE 96QL1 FL-1A/1B 96QQ-1 LT-TH-1A LT-TH-1B LT-TH-1C LTBT1D-1 96QT-2A <1> 96QT-2B 96QT-2C LTB1D-A LTB2D-1 --PI-38 96QV-1A <1> 96QV-1B 96QV-1C LT-OT-1 <1> PI-351

CUSTOMER TAG ------------LT -301 --PDT -308 TE -305 A TE -305 B TE -305 C TE -311 PT -310 A PT -310 B PT -310 C TE -312 TE -313 PI -357 B PI -380 PDT -300 A <1> PDT -300 B PDT -300 C TE -307 PI -406

DESCRIPTION LUBE OIL TANK MAIN LUBE OIL PUMP LUBE OIL AUXILIARY PUMP EMERGENCY PUMP LUBE OIL AUXILIARY PUMP MOTOR EMERGENCY PUMP MOTOR LUBE OIL TANK LEVEL LUBE OIL DUPLEX FILTER LUBE OIL FILTERS HEADER LUBE OIL HEADER TEMP.

LUBE SYSTEM THRUST BRG. DRAIN LUBE OIL HEADER PRESSURE

LUBE SYSTEM JOURNAL BRG. #1 DRAIN LUBE SYSTEM JOURNAL BRG. #2 DRAIN INSTRUMENT AIR REGULATION VAPOUR SEPARATOR INLET PRESSURE LUBE OIL TANK INTERNAL PRESSURE

LUBE OIL TANK TEMPERATURE 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 ITEM 3


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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. ITEM 3


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Instrumentation fault logic 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.

ITEM 3


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3.2

OIL VAPOUR SEPARATOR

DEVICE SUMMARY DEVICE NAME CUSTOMER TAG QV-1 --88QV-1 --PDS-1 --96QV-1A PDT -300 A 96QV-1B PDT -300 B 96QV-1C<1> PDT -300 C SOFTWARE DESCRIPTION

DESCRIPTION VAPOUR EXTRACTOR LUBE OIL MIST SEPARATOR MOTOR MINERAL OIL MIST ELIMINATOR LUBE OIL TANK INTERNAL PRESSURE

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 (4QT-1) , XS -147 (4QT2), 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.

ITEM 3


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3.3

LUBE OIL HEATER

DEVICE SUMMARY DEVICE NAME CUSTOMER TAG 23QT-1 --23QT-2 --23QT-3 --23QT-4 --LT-OT-1 TE -307 49QT-1 TSHH -300 49QT-2 TSHH -301 49QT-3 TSHH -302 49QT-4 TSHH -303 SOFTWARE DESCRIPTION

DESCRIPTION LUBE OIL ELECTRIC HEATER LUBE OIL ELECTRIC HEATER LUBE OIL ELECTRIC HEATER LUBE OIL ELECTRIC HEATER LUBE OIL TANK LUBE OIL TANK HEATER CUT OUT LUBE OIL TANK HEATER CUT OUT LUBE OIL TANK HEATER CUT OUT 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) Over-temperature 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 droppeddown 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.

ITEM 3


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3.4

LUBE OIL COOLER

DEVICE SUMMARY DEVICE NAME 88QFC-1 88QFC-2 88QFC-3 23QFC-1<1> 23QFC-2<1>

CUSTOMER TAG -----------

DESCRIPTION AIR COOLER FAN MOTOR AIR COOLER FAN MOTOR AIR COOLER FAN MOTOR COOLER FAN MOTOR SPACE HEATER COOLER FAN MOTOR SPACE HEATER

23QFC-3<1> 39QFC-1

--VSH -200

39QFC-2

VSH -201

39QFC-3

VSH -202

COOLER FAN MOTOR SPACE HEATER AIR COOLER MOTOR FAN VIBR. MONITORING AIR COOLER MOTOR FAN VIBR. MONITORING AIR COOLER MOTOR FAN VIBR. MONITORING

VTR-1 <1> 20QFC-1 <1>

TCV -306 XY -200

20QFC-2 <1>

XY -201

20QFC-3 <1>

XY -202

THERMOSTATIC VALVE AIR COOLER MOTOR FAN REMOTE RESET AIR COOLER MOTOR FAN REMOTE RESET AIR COOLER MOTOR FAN REMOTE 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). o <1> Lube Oil Tank temperature should be greater Than K26QM (Typically 86 F ) Stand-by fan Start/Stop logic Stand-by fan control is driven by LTTH1_W voted software signal, generated TE -305 A (LT-TH-1A) , 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 DEVICE NAME PH-1 PH-2 FH1-1÷2 FH-B 96HF-1 <1>

CUSTOMER TAG --88HQ ----PDT -323

96HQ-1 <1> VPR3-1

PT -324 PCV -320

VR-21 <1>

PSV -321

VR-22 <1>

PSV -318

DESCRIPTION HYDRAULIC OIL MAIN PUMP HYDRAULIC OIL AUXILLIARY PUMP HYDRAULIC OIL DUPLEX FILTER HYDRAULIC RATCHET OIL FILTER HYDR. OIL FILTERS DIFFERENTIAL PRESSURE HYDRAULIC OIL HEADER PRESSURE COMPENSATOR-HYDRAULIC OIL PUMP DISCHARGE MAIN HYDRAULIC PUMP DISCHARGE RELIEF AUX. HYDRAULIC PUMP DISCHARGE RELIEF

SOFTWARE DESCRIPTION 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.

Request during unit startup

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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 DEVICE NAME 20TU 33CS-1

CUSTOMER TAG FCV -330 ZSL -304

PS-1 23CR-1 88CR-1

DESCRIPTION TORQUE CONVERTER UNLOADING STARTING CLUTCH POSITION ENGAGED CHARGE PUMP FOR TORQUE CONVERTOR ANTICONDENSATION HEATER STARTING MOTOR

SOFTWARE DESCRIPTION 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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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) Unit shutdown (L94X)

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3.7

HYDRAULIC RATCHETING

DEVICE SUMMARY DEVICE NAME PH-3 88HR 43HR

CUSTOMER TAG ----HS -300

20HR-1

FV -326

FH-B 33HR1

--ZSL - 300

33CS-1

ZSL -304

DESCRIPTION RATCHET PUMP RATCHET MOTOR HYDRAULIC RATCHET CONTROL SWITCH HYDRAULIC RATCHET SELF SEQUENCING VALVES HYDRAULIC RATCHET OIL FILTER HYDRAULLIC RATCHET VALVE POSITION 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. ITEM 3


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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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3.8

WHEELSPACES

DEVICE SUMMARY DEVICE NAME TT-WS1FO-1 TT-WS1FO-2 TT-WS1AO-1 TT-WS1AO-2 TT-WS2FO-1 TT-WS2FO-2 TT-WS2AO-1 TT-WS2AO-2

CUSTOMER TAG TE -208 A TE -208 B TE -214 A TE -214 B TE -209 A TE -209 B TE -213 A TE -213 B

DESCRIPTION WHEEL SPACE TEMP. 1st STAGE FWD OUTER #1 WHEEL SPACE TEMP. 1st STAGE FWD OUTER #2 WHEEL SPACE TEMP. 1st STAGE AFT OUTER #1 WHEEL SPACE TEMP. 1st STAGE AFT OUTER #2 WHEEL SPACE TEMP. 2nd STAGE FWD OUTER #1 WHEEL SPACE TEMP. 2nd STAGE FWD OUTER #2 WHEEL SPACE TEMP. 2nd STAGE AFT OUTER #1 WHEEL SPACE TEMP. 2nd STAGE AFT OUTER #2

SOFTWARE DESCRIPTION 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 DEVICE NAME 39V-1A 39V-1B 39V-2A 39V-2B

CUSTOMER TAG VE -209 A VE -209 B VE -210 A VE -210 B

DESCRIPTION TURBINE BRG.#1 VIBRATION TURBINE BRG.#1 VIBRATION TURBINE CASING VIBRATION TURBINE CASING VIBRATION

SOFTWARE DESCRIPTION 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

DEVICE NAME 20TW-1

CUSTOMER TAG XY -407

20TW-2

XY -406

DESCRIPTION ON LINE WASHING WATER SOLENOID VALVE 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: Water wash sequence is stopped during its execution in case of unit normal stop.

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3.11 VENTILATION DEVICE SUMMARY DEVICE NAME FNVF1÷2 88BA-1÷2 DVF-1÷6 33ID-1 33ID-2 33OD-1

CUSTOMER TAG ------ZSH -207 A ZSH -207 B ZSH -202 A

33OD-2

ZSH -202 B

96SV-1A 96SV-1B 96SV-1C TT-BA-2A

PDT -205 A PDT -205 B PDT -205 C TE -296 A

TT-BA-2B

TE -296 B

TT-BA-2C

TE -296 C

33DT-1 ÷ 33DT-10

ZSL -206 A ÷ ZSL -206 J

DESCRIPTION CENTRIFUGAL VENTILATION FAN VENTILATION FAN AC MOTOR DAMPERS VENTILATION INLET DAMPER OPEN VENTILATION INLET DAMPER OPEN TURBINE COMP. VENTILATION OUTLET OPEN COUPLING COMP. VENTILATION OUTLET OPEN VENTILATION FANS SWITCH-OVER VENTILATION FANS SWITCH-OVER VENTILATION FANS SWITCH-OVER TURBINE COMPARTMENT INTERNAL TEMP. TURBINE COMPARTMENT INTERNAL TEMP. TURBINE COMPARTMENT INTERNAL TEMP. ACCESS DOORS LIMIT SWITCH

SOFTWARE DESCRIPTION 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. Main fan is started if: ITEM 3


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Turbine starting sequence is initiated (L1X is true) All start permissive conditions are verified (L3BT is true) All cutoffs conditions are not verified (L4BT is false) Offline water wash not selected (L83BW is false) Main fan is then stopped: K4BTON (typically 120 min) after flameout (L28FDX is false). If Auxiliary fan is started due to the detection of one of its start conditions.

Auxiliary fan command Auxiliary fan is started if: One of auxiliary fan start conditions is verified (L2BT is true) All cutoffs conditions are not verified (L4BT is false) When auxiliary fan start conditions are not verified, the fan is stopped if one of the following conditions is true: K4BTON (typically120 min) after flameout (L28FDX is false) Manually by HMI pushbutton (L43BT1÷2S_CPB command) - From MCC drawers Switchover Sequence A switchover event is defined as an automatic or manual change of the fan selected to run. An automatic switchover to Stand-by is requested (L2BT) if the main fan has a decrease in performance, sensed by low enclosure differential pressure (L63BT). At automatic switchover, the Stand-by fan starts immediately and the main fan is kept running for a switchover delay time (typically 10 s), and than is stopped. If the stand-by fan is running due to an automatic switchover, than the stand-by fan running alarm is activated (L52BT_ALM) and further automatic switchover are disabled. If low alarm persists after a changeover, shutdown is generated. Automatic switchover is bypassed if one of the following condition is verified: Loss of ventilation due to open door Admission to enclosure procedure activated After the automatic switchover to stand-by, if the operative differential pressure has been recovered, after proper inspection of main fan failures, the operator can reset the stand-by running alarm, by selecting as main the running fan through L43BT_CMD command. Note that if otherwise the operative differential pressure has not been recovered, acting on L43BT_CMD doesn’t cause the stand-by alarm reset but causes a manual switchover to new selected stand-by fan. The operator can force a manual fan switchover through HMI pushbutton L43BT_CMD. If the operator requests a (manual) fan switchover when the main fan is running, than the new selected main fan starts immediately and the deselected fan continues to run for the switchover delay time, than is stopped. Manual fan switchover does not activate any stand-by fan running alarm. If the operator requests a manual fan switchover when both fans are running or both are stopped, nothing changes except the main vs. stand-by fan selection. Manual fans command If all start permissive conditions are verified and all cutoffs conditions are not verified, each fan can be manually started (HMI command L43BT1÷2_CMD) and stopped (HMI command L43BT1÷2S_CPB) ITEM 3


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Alarms and trips logic The turbine compartment outlet temperatures are used to calculate the median value. Temperature alarms and trips are generated as follows: If voted signal is detected higher than threshold K26BA, software output L26BA and alarm L26BA_ALM are generated. The related P&Id alarm is TAH -296 If voted signal is detected higher than threshold K26BT, software trip signal L26BT and alarm L26BT_ALM are generated. The related P&Id trip is. TAHH -296 Moreover, if turbine compartment differential pressure is detected low by MKVIe signal A63BT_W, software alarm L63BT_ALM is generated and, if auxiliary fan has been running for more than 30 sec., shutdown is started. If at least one turbine/gearbox enclosure door limit switch between 33DT-1 To 33DT-10 L33DT_ALM alarm is generated by the MKVIe.

is not closed,

If dampers are not fully open, the following software alarms are generated: L33ID1_ALM from ZSH -207 A (33ID-1) limit switch L33ID2_ALM from ZSH -207 B (33ID-2) limit switch L33OD1_ALM from ZSH -202 A (33OD-1) limit switch located in the turbine compartment L33OD2_ALM from ZSH -202 B (33OD-2) limit switch located in the gearbox compartment.

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3.12 INLET AND FILTRATION DEVICE SUMMARY DEVICE NAME 96TF-1A

CUSTOMER TAG PDIT -252 A

96TF-1B

PDIT -252 B

96TF-1C

PDIT -252 C

AT-IA-1

TE -217 A

AT-IA-2

TE -217 B

AT-IA-3

TE -217 C

96AP-1A 96AP-1B 96AP-1C

PT -212 A PT -212 B PT -212 C

DESCRIPTION TURBINE AIR INLET FILTER CTRL PRESS. TURBINE AIR INLET FILTER CTRL PRESS. TURBINE AIR INLET FILTER CTRL PRESS. FILTER HOUSE INLET AIR TEMPERATURE FILTER HOUSE INLET AIR TEMPERATURE FILTER HOUSE INLET AIR TEMPERATURE AMBIENT PRESSURE AMBIENT PRESSURE AMBIENT PRESSURE

SOFTWARE DESCRIPTION Alarms and trips logic If inlet air filter differential pressure is detected high by L63TF1H_W software signal for more then K63TF1_ALM (typically 2 s), alarm L63TF1_ALM is generated by the MKVIe; the related P&Id alarm is PDAH-4054. If inlet air filter differential pressure is detected high by shutdown logic, shutdown signal L63TF and alarm L63TF_ALM are generated by the MKVIe. The related P&Id alarm is PDAHH-4054. If air pressure into pulse jet system is detected low by a63ca software signal, alarm L63CA_ALM is generated by the MKVIe.

High pulse jet filter differential pressure detected by PDSH -226 (63PJ-1) is annunciated with PDAH-4053 alarm. Instrumentation fault logic If absolute value of difference between the highest and the lowest of the three pressure values given PDIT -252 A (96TF-1A), PDIT -252 B (96TF-1B) , PDIT -252 C (96TF-1C) is higher than threshold K63TF_FLT for more than time delay K63TF_SENSR (typically 60 s) software alarm L63TF_SENSR is generated.

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3.13 FUEL GAS<1> DEVICE SUMMARY DEVICE NAME 20VG-1 96FG-2A 96FG-2B 96FG-2C 90SR 20FG-1 20FG-2

CUSTOMER TAG FV -109 PT -109 A PT -109 B PT -109 C ZCV -307 FV -337 FV -338

TG-FG-1 TG-FG-2 TG-FG-3 96FG-1 96SR-1 96SR-2 65GC 96GC-1 96GC-2

TE -104 A TE -104 B TE -104 C PT -108 ZT -101 A ZT -101 B ZCV -306 ZT -102 A ZT -102 B

DESCRIPTION FUEL GAS VENT INTERSTAGE FUEL GAS INTERSTAGE FUEL GAS INTERSTAGE FUEL GAS STOP/SPEED RATIO VALVE STOP/RATIO VALVE CONTROL OIL TRIP GAS CONTROL VALVE CONTROL OIL TRIP FUEL GAS TEMPERATURE INLET FUEL GAS TEMPERATURE INLET FUEL GAS TEMPERATURE INLET UPSTREAM SRGC VALVE PRESSURE STOP/RATIO VALVE LVDT STOP/RATIO VALVE LVDT GAS CONTROL VALVE GAS CONTROL VALVE LVDT GAS CONTROL VALVE LVDT

SOFTWARE DESCRIPTION Alarms logic. Vent valve control sequence Vent valve opening is enabled if the following conditions are all verified: Water wash off-line not active (~L83BW) Flame not detected (~L28FDX) Ignition command not detected (~L2TVX) After start passed (L4) Conditions above select an enabling window between start passed and igniting events (see figure 1). Also, venting is disabled in case of off -line water wash sequence. L4

L2TVX L28FDX

Opening enabling window

Alarm enabling

Figure 1 - Vent valve enabling

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If vent valve opening is enabled, open command (l20vg2) is generated if fuel gas temperature is less than K26FGL_VG2 (typically 4°F) above alarm threshold K26FGL. Then it closes again with an hysteresis of K26FGL_VG2_H (typically 8°F). After an opening command (l20vg2), if valve is not open, detected by ~l33vg2_c, within 3s, alarm L86VG2_ALM is generated. After a closing command (~l20vg2), if valve is not completely closed, detected by l33vg2_c, within K20VG2_C (typically 30s), alarm L86VG2_ALM is generated. If valve is not completely closed, detected by ~l33vg2_c, alarm L33VG2_ALM is generated if at least one of the following conditions is true: Water wash off-line active (L83BW) Ignition active (L2TVX) Before start passed and after K20VG2_C seconds from loss of L4. After flame detection and before 1.1 * K20VG2_C seconds after loss of flame (~L28FDX). Conditions above select the complementary to the enabling opening window (see figure 1). Note that in case of trip event before ignition, the alarm is also disabled during maximum closing time (K20VG2_C) to allow vent valve to close. Alarms logic. If the fuel gas pressure is low, detected by l63fgl, during ignition L2TVX or with flame detected L28FDX, alarm L63FGL_ALM is generated. If the fuel gas temperature ftg2 is lower than K26FGL (typically 86°F) during ignition L2TVX or with flame detected L28FDX , then alarm L26FGL_ALM is generated. If the fuel gas temperature ftg2 is higher than K26FGH (typically 284°F), alarm L26FGH_ALM is generated.

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3.14 FIRE FIGHTING AND GAS DETECTION MONITORING DEVICE SUMMARY DEVICE NAME 33CR-20/1 ÷33CR-20/n

CUSTOMER TAG WSL -703 1 ÷WSL -703 N

33CR-21/1 ÷33CR-21/n

WSL -705 1 ÷WSL -705 N

33CR-30/1 ÷33CR-30/n

WSL -706 1 ÷WSL -706 N

33CR-31/1 ÷33CR-31/n

WSL -708 1 ÷WSL -708 N

33CP-4A

ZSH -702 A

33CP-4B

ZSH -702 B

DESCRIPTION BATT. "A" INIT. DISCH. CO2 BOTTLE EMPTY BATT. "A" EXT. DISCH. CO2 BOTTLE EMPTY BATT. "A" INIT. DISCH. CO2 BOTTLE EMPTY BATT. "A" EXT. DISCH. CO2 BOTTLE EMPTY CO2 EXTENDED DISCH. ISOL. VALVE - OPEN CO2 INITIAL DISCH. ISOL. VALVE OPEN

SOFTWARE DESCRIPTION Fire Fighting &Gas detection logic: Kindly refer the F&G PLC Logic Digram (SOM5461015)

Field Interface: If at least one fire fighting CO2 discharge valve is detected not open (L33CP is false) by the limit switch ZSH -702 A (33CP-4A) or the limit switch ZSH -702 B (33CP-4B) , MKVIe alarm L33CP_ALM is generated; the related P&Id alarm is ZAK-701A. If at least one fire fighting CO2 discharge valve is detected closed, XS -160 (33CP-1) signal (software signal l33cp_c) is received from F&G monitor and MKVIe alarm L33CPC_ALM, complementary XS -160 (33CP-1), is generated. If at least one fire fighting bottle in bank A is empty, WSL -703 (33CR-A) MKVIe alarm L33CR_A_ALM (P&Id alarm WAL-700) is generated. If at least one fire fighting bottle in bank B is empty, WSL -706 (33CR-B) MKVIe alarm L33CR_B_ALM (P&Id alarm WAL-701) is generated. CO2 discharge logic: The fire and gas monitor can be set in Automatic or Inhibited mode. In Automatic Mode the extinguishant shall be released, after a 30 seconds delay, upon automatic detection of fire or manual activation of discharge pushbuttons. This condition is immediately notified through horns and red flashing lights close to the enclosure. In Inhibited mode, only manual CO2 release activation is available. If fire trip is generated and notified to MKVIe through XS -163 (45FTT) hardwired signal (l45ftt MKVIe software signal) by the F&G panel, and, after an appropriate delay1, no CO2 discharge positive feedback is detected (XS -171 (63CPD) hardwired signal from F&G panel to MKVIe; l63cpd MKVIe software signal), MKVIe alarm L30CPD_ALM –CO2DISCHARGE FAILED- is raised.

1

This delay is the sum of safety CO2 discharge command delay (30sec) and actual discharge time on quick discharge header (this value – K96CP- is set to 30sec with a conservative approach. To be adjusted at site if needed). ITEM 3


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3.15 GENERATOR HEATER AND COOLING FANS SYSTEM DEVICE SUMMARY DEVICE NAME 88QG-1

CUSTOMER TAG ---

88QG-2

---

88QG-3

---

23QG-1

---

23QG-2

---

23QG-3

---

23EG1-4 A26GAC1 A26GAW A26GAC2

--TE -371 TE -372 TE -373

A26GWU-1 TE -375 A26GWU-3 TE -377 A26GWV-1 TE -378 A26GWV-3 TE -380 A26GWW-1 TE -381 A26GWW-3 TE -383 SOFTWARE DESCRIPTION The generator is equipped with 3 fans and 3 heaters.

DESCRIPTION GENERATOR VENTILATION FAN MOTOR GENERATOR VENTILATION FAN MOTOR GENERATOR VENTILATION FAN MOTOR GENERATOR VENTILATION FAN MOTOR SPACE HEATER GENERATOR VENTILATION FAN MOTOR SPACE HEATER GENERATOR VENTILATION FAN MOTOR SPACE HEATER GENERATOR SPACE HEATER<4> GENERATOR COOLING AIR - COLD D.E. GENERATOR COOLING AIR - WARM GENERATOR COOLING AIR - COLD N.D.E. WINDING GENERATOR PHASE U WINDING GENERATOR PHASE U WINDING GENERATOR PHASE V WINDING GENERATOR PHASE V WINDING GENERATOR PHASE W WINDING GENERATOR PHASE W

Generator fans are started and generator heaters are stopped at generator breaker closure. On the opposite side, generator fans are stopped, and generator heaters are started when generator breaker opening occurs. Cooling fans are designed for continuous operation. It is sufficient to have two of the three cooling fans in service to provide generator full output power; this is the reason why, during normal operation, two o generator fans are activated, while the third one (auxiliary fan) starts only if a threshold of 95 C is reached by TE -371 (A26GAC1) , TE -372 (A26GAW) , TE -373 (A26GAC2) output values (a26bg1, a26bg2, a26bg3 software signals). The auxiliary fan is selected by the operator and is started when one high temperature alarm between TAH-371, TAH-372, and TAH-373 is displayed. When the high temperature alarm condition is reset, the auxiliary fan remains running and can be stopped manually by the operator from HMI or MCC. If auxiliary fan is started an alarm is generated. During normal GT operation, the operator can choose a different auxiliary fan, starting it and stopping one of the previous selected main fans; anyway two of three cooling fans are always required in service. The generator is also equipped with four anticondensate heaters 23EG-1-4 which are switched on after the cool-down period (L62CD) and during off line water washing sequence and switched off on flame detected.<4>

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3.16 GENERATOR SYNCHRONIZATION SEQUENCES DEVICE SUMMARY DEVICE NAME 77NH-1

CUSTOMER TAG SE -200 A

77NH-2

SE -200 B

77NH-3

SE -200 C

20CB-1

FV -212

DESCRIPTION MAGNETIC PICKUP - TURBINE SPEED (OVSP) MAGNETIC PICKUP - TURBINE SPEED (OVSP) MAGNETIC PICKUP - TURBINE SPEED (OVSP) VA2-1/2 VALVES ACTUATION

SOFTWARE DESCRIPTION All the instrumentation involved is controlled by the Mark VIe. When the turbine shaft speed is detected at 95% of rated speed by SE -200 A (77NH-1) , SE -200 B (77NH-2) and SE -200 C (77NH-3) , the turbine axial compressor bleed valves are operated closed through FV -212 (20CB-1) solenoid valve, and the turbine is ready to synchronize. The complete sequence flag (software signal L3) will be reset in case of trip sequence initiated (software signal L4 = 0) or shutdown sequence initiated (software signal L94X=1). On the HMI synchronization display, the the following operating modes are available: OFF This selection disables all MARK VIe synchronizing functions. This selection is forced if GCPP manual synchronization is enabled. AUTO This selection enables the automatic synchronization using the MKVIe internal functions; it is set to true if GCPP permissive –XS -202 (GCPP-AUTO) - is true. With auto-synchronization selected, when the turbine shaft speed is detected equal to minimum operating speed (95% of rated speed), the signal XS -212 (41FX) – “EXCITATION ENABLED 95% SPEED” is sent from MARK VIe to the GCPP and then replicated from this panel to the GEP. If all the following synchronization permissive conditions are satisfied, turbine shaft speed reference is set to 100.3 %: Generator breaker open status (software signal L52GX is false); BUS reference voltage fault not detected (software signal l8vtb1 is false); AVR reference voltage fault not detected (software signal l8vtavr is false); Metering reference voltage fault not detected (software signal l8vtm is false); Protections reference voltage fault not detected (software signal l8vtp is false); AVR Automatic mode selected (software signal l43avr is true); AVR Local mode not selected (software signal l43avrlc is false); Field contactor closed (software signal l41x is true); Complete start sequence ended (L3 is true) Automatic synchronizing permissive (l3gg is true) See also section 2.6. When 100.3% of turbine rated shaft speed is reached, the unit is ready to synchronize. Upon “ready to synchronize” condition detection and “Start Autosync” HMI pushbutton activation, generator breaker closure command XS -215 (25) is sent from the MKVIe to the GCPP. Speed and voltage matching permissive signal raise is required to allow circuit breaker closing command to be sent; this permissive signal is obtained as a cumulative signal composed of: Synchronization permissives; Software signal L3SVL notifying that bus voltage is between 95 and 105 % of rated voltage; Software signal displaying that generator frequency differs less than 1Hz from rated frequency; Software signal displaying that line frequency differs less than 1Hz from rated frequency. ITEM 3


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The voltage-matching algorithm generates raise/lower signals l83rv/l83lv, sent by the MKVIe to the GCPP voltage regulator XS -213 (83-RV), XS -214 (83-LV) hardwired signal). The speed-matching algorithm generates raise/lower signals used to change turbine speed reference. Speed matching is designed to bring the generator frequency slightly (0.15 Hz) above the line frequency. The generator breaker is closed when the synchro-check contact is closed. After generator breaker closure, the MKVIe increases the quantity of fuel provided to the turbine by regulating fuel gas valves position, in order to reach the “partial load” level of active power, if preselected load or base load is set. In case of a generator breaker trip the turbine speed reference is restored to 100.3 % and the unit becomes again ready to be synchronized. Unit start command, available through a pushbutton on the HMI, is required to restart the synchronization process. Load management control logics Load management is performed selecting “Droop” or “Isochronous” mode. This selection is available on the HMI, if the main selector is in “Local” (software signal L43R is false) position. If the main selector position is “Remote” (software signal L43R is true), load management mode selection is performed by the Power Management System.. Manual load management control logics If main selector on HMI is in “Local” position (software signal L43R is false), the operator is allowed to change current active power value, using raise and lower HMI push buttons. If “pre-selected” load selection is configured, load management is automatically transferred to manual mode upon raise or lower push button selection.

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3.17 DROOP AND ISOCHRONOUS CONTROL MODE In normal procedure the MARK VIe governor control is automatically switched in Constant Settable DROOP mode, as soon as the generator breaker is closed; in this operative mode, the load control is performed via “Power Raise/Lower” signals by the HMI or the PMS (if master selector is in “Remote” position). This Speed/Load control method considers gas turbine megawatt output as a control parameter to formulate the turbine droop response to electrical grid perturbations and consequently adjust it in order to maintain grid frequency at a constant value. The following chart shows how the turbine power supplied to the load (horizontal axis) varies with reference to turbine speed set point. This set point, called TNR, is the gas turbine speed reference in terms of percent of the nominal speed, and maintains a constant value on each diagonal line in the chart. As clearly displayed, if TNR value is fixed (i.e. TNR=104% - see the bold diagonal line in the graph), any load demand reduction of 25% makes the turbine speed to increase of 1% and the corresponding grid frequency (shown on the left vertical axis) to rise up of 0.5Hz. Conversely, if a 25% additional load is connected to the grid, a complementary 1% speed and 0.5 grid frequency reduction occurs, moving along “TNR=104%” diagonal line. Constant Settable Droop Control manages TNR constant adjustments, based on load demand variations, to prevent the grid frequency from changinig as described. After synchronization to an electrical power grid with 60Hz frequency, the TNR value has to be changed between 100% and 104% to modify the load output from 0% to 100% (consider the chart below moving from point (A) to point (B)). For different fixed values of grid frequency, as displayed in the chart, the Constant Settable Droop load control mode makes a 4% variation of turbine speed set-point correspond to a 100% variation of the power supplied to the load. Droop Governor Response (4% Droop)

62.5 TN R 62

TN

R

61.5 TNR 61 60.5

R

TN TN

R

A

104

=1 04

103

=1 03 =1

R

105 05

Ra ted

02

102 Ba

=1 01

=1 00 25

se

Lo

101

ad

100

B

50

75

100

125

150

% Load

59.5

99

59

98

58.5

97

58

96

57.5

95

Turbine Speed [%]

Grid Frequency [Hz]

60

TN

=1

FIG.1 -DROOP REGULATION

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ISOCHRONOUS control mode is also possible in this kind of units. In this load control mode, the unit is driven to maintain a constant speed regardless of the load requirements and therefore of the output delivered. Consequently, in this load control mode, the value of the active power supplied to the load can’t be set and the machine faces to all load variations; i.e., if an increase in load power demand occurs, gas turbine consequent response is a speed reduction, immediately corrected by the speed controller increasing the gas quantity supplied to the machine. For this reason, if two or more interconnected units are working together, each load variation causes a fuel gas flow adjustment in the unit running in isochronous mode, while the other units (in DROOP mode) are set to deliver a fixed power output.

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3.18 BASE LOAD DEVICE SUMMARY DEVICE NAME TT-XD-1  TT-XD-13

CUSTOMER TAG TE -211 A  TE -211 M

96CD-1 96CD-2 96CD-3

PT -214 A PT -214 B PT -214 C

DESCRIPTION EXHAUST TEMPERATURE THERMOCOUPLE AXIAL COMPRESSOR DISCHARGE AXIAL COMPRESSOR DISCHARGE AXIAL COMPRESSOR DISCHARGE

SOFTWARE DESCRIPTION When BASE LOAD is selected the unit is automatically loaded after synchronization and output power is increased until maximum rated exhaust temperature detection (notified by TE -211 A (TT-XD-1) TE -211 M (TT-XD-13)). After any ambient conditions change, delivered power is automatically adjusted to hold the highest allowable MWatt output. The reference of the exhaust temperature is biased by MEDIAN compressor discharge pressure to maintain a constant firing temperature even when the ambient conditions are changing. PRESELECTED LOAD The operator is allowed to set a certain MWatt output value as an HMI input; the Mark VIe will use this value as a pre-selected load control constant. When PRESELECTED load control mode is set, the unit will automatically load or unload till the required MWatt output is reached. The control system will regulate the MWatt output within the allowed operating values. MANUAL LOAD CONTROL Manual load selection is performed on the HMI. Any different selected mode (i.e. Pre-Selected) will be reset to manual control if the operator activates RAISE/LOWER commands on HMI or if the governor control is transferred from DROOP to ISOCHRONOUS. Frequency adjustment is also permitted to the operator through raise/lower push buttons.

3.19 EJECTOR LOGIC <4> DEVICE SUMMARY DEVICE NAME -----

CUSTOMER TAG SOV -216 ZSH -216

---

ZSH -217

DESCRIPTION AIR EIECTOR CONTROL VALVE AIR EIECTOR CONTROL VALVE - VALVE OPEN AIR EIECTOR CONTROL VALVE - VALVE OPEN

SOFTWARE DESCRIPTION All units equipped with IBH system show high temperature in the second wheel space after when running at very low load (approx 30%) and IGV angle set at 42 deg. In some case high temperature alarm set point (427 °C) was reached.

4

R E V IS E D W H E R E S H O W N A S < 4 >

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To mitigate the high wheel space temperature issue, the GT cooling system has been redesigned and made more efficient by means of the ejector installed at the 4th stage compressor extraction. Design Criteria th

Ejector system will improve the cooling through the 4 stage during partial load operation. th

Ejector will commutate to close position when the pressure on 4 stage will reach the value of 1.3 – 1.4 barA. The valve selected for the ejector control is an Electro-Pneumatic valve. A solenoid controlled by a Mark VI signal direct the pneumatic actuator to open or close the ejector valve. The control signal is the IGV feedback and the pneumatic actuator is put into action by instrument air.

Test performed on field shown the ejector capability to provide the right cooling flow during partial load operation.

Sakhalin Field Test 450 400

Bara

3.1

350 Wheelspace temperature remain well below the alarm in all IGV range

Ejector valve close when P4 reaches 1.3 - 1.4 barA

2.3

300 250 200 150

1.4

100 50

0.6

0

40

45

50

55

P4 upper

60

65

70

75

P10 upper IGVTTWS2AO1

80

85

90

TTWS2AO2

Valve Setting The valve shall commutate the ejector opening/closing with the following logic: if IGV > IGVclose valve closed; if IGV < IGVopen valve open; Where: IGVclose = 60 DEG IGVopen = 57 DEG

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Valve closed

Valve open IGV IGVopen

IGVclose

Signal

The ejector valve will be controlled by IGV position signal in order to guarantee the correlation Extraction Pressure – IGV – Cooling Flow; Conclusion

An electro-pneumatic valve will control ejector through the IGV position based on the logic: if IGV > IGVclose valve closed; if IGV < IGVopen valve open; Where: IGVclose = 60 DEG IGVopen = 57 DEG

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Functional Description Alrar

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