GT Start Up [PDF]

Zitiervorschau

Contents

1.0 Purpose

……………………………. 2

2.0 Scope of Application

..………..…………2

3.0 Reference

………………….………… 2

4.0 Definition

..………………….……….. 2

5.0 Responsibility …………………….……….. 3

6.0 Procedure

7.0 Appendix

……………………..…..…… 3

….………………………….…. 6

1. Purpose The purpose of this procedure gives a guide line for concerned system of the Vemagiri Power Generation Limited Unit #1. 2. Scope of Application

This procedure is applicable to standing procedure, operating procedure, special work procedure and maintenance procedure 3. Reference 3.1 OEM Manual 4. Definition 4.1 OEM : Original Engineering Manufacture 5. Responsibility 5.1 Plant Manager Plant Manager will keep the contents of the procedure under review and reissue it when required. 5.2 Operation Manager Operation Manger is responsible for implementing the procedure for safe operation in the VPGL CCPP. 5.3 Operation Staff Operators have to operate as per procedure with full understanding. 6. Procedure 6.1 System Description Gas Turbine Functional Description: The MS-9001FA is a single-shaft gas turbine designed for operation as a simple-cycle unit or in a combined steam and gas turbine cycle. The gas turbine assembly contains six major sections: 1. Air inlet 2. Compressor 3. Combustion System 4. Turbine 5. Exhaust 6. Support systems

COMPRESSOR SECTION: The 18 stage axial-flow compressor section consists of the compressor rotor and the compressor casing. Within the compressor casing are the variable inlet guide vanes, the various stages of rotor and stator balding, and the exit guide vanes. In the compressor, air is confined to the space between the rotor and stator where it is compressed in stages by a series of alternate rotating (rotor) and stationary (stator) airfoil-shaped blades. The rotor blades supply the force needed to compress the air in each stage and the stator blades guide the air so that it enters the following rotor stage at the proper angle. The compressed air exits through the compressor discharge casing to the combustion chambers. Air is extracted from the compressor for turbine cooling and for pulsation.

DLN-2 COMBUSTION SYSTEM: The combustion system is of the reverse-flow type with the 18 combustion chambers arranged around the periphery of the compressor discharge casing. Combustion chambers are numbered counter clockwise when viewed looking downstream and starting from the top left of the machine. This system also includes the fuel nozzles, a spark plug ignition system, flame detectors, and crossfire tubes. Hot gases, generated from burning fuel in the combustion chambers, flow through the impingement cooled transition pieces to the turbine. High pressure air from the compressor discharge is directed around the transition pieces. Some of the air enters the holes in the impingement sleeve to cool the transition pieces and flows into the flow sleeve. The rest enters the annulus between the flow sleeve and the combustion liner through holes in the downstream end of the flow sleeve. This air enters the combustion zone through the cap assembly for proper fuel combustion. Fuel is supplied to each combustion chamber through five nozzles designed to disperse and mix the fuel with the proper amount of combustion air.

TURBINE SECTION: The three-stage turbine section is the area in which energy in the form of high temperature pressurized gas, produced by the compressor and combustion sections, is converted to mechanical energy. MS9001FA gas turbine hardware includes the turbine rotor, turbine casing, exhaust frame, exhaust diffuser, nozzles, and shrouds. AIR INLET SYSTEM: The air inlet system consists of the following: A filter house with weather hoods, an automatic self cleaning filtration system using high efficiency filter elements, evaporative cooler module, and an inlet ducting system. Using the “Up and Forward” arrangement, the filter house rests on top of the inlet ducting support structure. The inlet ducting system is mounted on the inlet ducting support structure along with the inlet bleed heating module. Air enters the filter house and continues through the transition piece, the acoustical silencer, the inlet heating module, the trash screen, and then to the turbine compressor through the inlet plenum. The elevated filter house arrangement provides a compact system that minimizes the pickup of dust in the filter house. The reverse-pulse type self-cleaning system is initiated when the filter elements become laden with dust and the pressure drop across the filter media reaches a

predetermined value (as measured by a differential pressure switch). The elements are cleaned in a specific order, controlled by an automatic sequencer. The sequencer operates a series of solenoid valves, each of which controls the cleaning of a small number of filters. During cleaning, each valve releases a brief pulse of high pressure air. This pulse shocks the filters by causing a momentary reverse flow. This causes the accumulated dust to break loose and fall into the hoppers, to be ejected after the cleaning cycle is completed. The cleaning cycle continues until enough dust is removed for the compartment pressure drop to reach the lower differential pressure switch set point. The evaporative cooler uses the process of evaporation to create a reduction in inlet air temperature. In this system, water is pumped from the sump to a header at the top of a wall of media, within the module. This header evenly distributes The water over the media blocks, consisting of corrugated layers of fibrous material. The media blocks contain internal channels, formed in layers, that direct the water downward and against the direction of airflow. LUBE OIL SYSTEM: The lubricating and hydraulic oil requirements for the 9FA gas turbine power plant are furnished by a separate, enclosed, forced-feed lubrication module. This lubrication module, complete with tank, pumps, coolers, filters, valves and various control and protection devices, furnishes oil to the gas turbine bearings, generator bearings (absorbing the heat rejection load), .This module is also used to supply oil for the lift oil system, trip oil system and the hydrogen seals on the generator. Additionally, a portion of the pressurized fluid is diverted and filtered again for use by hydraulic control devices as control fluid. The lubrication system is designed to supply filtered lubricant at the proper temperature and pressure for operation of the turbine and its associated equipment. Major system components include: 1. Lubricant oil reservoir which serves as a base for the accessory module. 2. Two centrifugal pumps (PQ1-1 and PQ1-2) each driven by an AC electrical motor (88QA-1 and 88QA-2) 3. Emergency oil pump (PQ2-1) with DC motor (88QE-1). 4. Main Seal oil pump (PQ3-1) driven by AC motor (88QS-1). 5. Emergency seal oil pump driven by DC motor (88ES-1) 6. Dual lubricating oil heat exchangers in parallel (LOHX-1 and LOHX-2). 7. Two full flow lubricating oil filters in parallel (LF3-1 and LF3-2). 8. Bearing header pressure regulator (VPR2-1). 9. Mist eliminator (LF3-3) with redundant fan/motor (88QV-1A and 88QV-1B) and motor space heaters (23QV-2A and 23QV-2B).

The lube oil is circulated by a redundant set of AC pumps. A DC pump is provided in case AC power to the site is interrupted. These pumps are the first of the auxiliary equipment to be energized during a start-up sequence. Following shutdown of the unit, these pumps continue to run throughout the extensive cool down period and are the last of the auxiliary equipment to be stopped. The lube oil system is self-contained. After lubricating and removing heat from the Rotating equipment, oil is returned to the lube oil tank. It is cooled by oil-to-water heat exchangers as it is pumped from the tank and re-circulated. Various sensing devices are included in the design to ensure adequate oil level in the tank, oil pressure, and oil temperature. The oil is first pumped through one of the two parallel heat exchangers (LOHX-1 and LOHX-2). Each is designed to maintain the oil at the proper bearing header temperature. The maximum allowable bearing header temperature under normal operating conditions is 160°F (71.1°C). The oil then flows through one of the two full flow parallel filters (LF3-1 and LF3-2). A three-way transfer valve controls Selection of which set of heat exchanger/filter is in use. The system is ventilated through a mist eliminator mounted on top of the lube oil reservoir. A slight Negative pressure is maintained in the system by redundant motor driven fans (88QV-1A and 88QV- 1B) pulling air through the mist eliminator. SEAL OIL SYSTEM: The seal oil to the generator bearings is normally supplied by the lubricating system through a separate line (tap OS-1) directly to the generator. In the event of low lube system pressure or lube system shutdown for service, one of two seal oil pumps supply the oil required to seal in the generator hydrogen. Under normal circumstances the AC motor driven pump (PQ3-1, 88QS-1) would serve this function; However, if this AC motor should fail or if AC power is lost, the emergency DC motor driven (88ES-1) is activated and drives the seal oil pump. The AC motor (88QS-1) includes a heater (23QS-1) to prevent condensation in the motor. To safely and effectively employ hydrogen for generator cooling, it is necessary to contain the gas in the generator casing. Therefore, shaft seals are required at each end of the generator where the rotor extends through the end shield. A radial oil film type seal is used for this purpose TRIP OIL SYSTEM: The Gas Turbine Control and Protection Systems are operated by the SPEEDTRONICcontrol through Electro-hydraulic devices. This is done to provide the necessary actuation forces to operate the various Control and protection equipment located on the Gas Turbine and its associated accessory modules.

The electro-hydraulic devices consist of servo valves, which act to modulate the final controlling element in response to the operational requirements of the unit, and hydro-mechanical relays and

solenoid operated tripping valves, which act to interrupt the controlling action of the servo valves and trip the controlling element in the event of a trip. LIFT OIL SUPPLY: Bearing lift oil is used to raise the turbine-generator rotor onto a thin, static oil film at each journal bearing to minimize rotation friction losses the gas turbine starting means or turning gear must overcome. Lift Oil Supply Isolation Valve (20QB-1) is a solenoid-operated valve. When energized, high-pressure oil is allowed to flow to each of the turbine-generator bearings. Each bearing is equipped with a flow-regulating valve to keep lift oil supply flow rate constant. In addition, the lift oil supply lines at the bearings contain check valves to prevent bearing feed oil from back flowing into lift oil supply lines. 20QB-1 has a manual override to be used if the solenoid fails. There is also a sensing line connected from downstream of the solenoid to the Compensator block. When the solenoid is open, the sensing line is pressurized, thus selecting the high-pressure setting. Bearing Lift Oil Supply Pressure Switch (63QB-1) provides an alarm in the turbine control system if lift oil supply pressure is low, and will prevent the turning gear motor from starting should there be insufficient pressure. HYDRAULIC OIL SUPPLY: Hydraulic Supply pressure is required to actuate the gas valves, IGV’s. Each pump circuit contains a Hydraulic Oil Supply Pressure Regulating Valve (VPR4-3, VPR4-4). These pressure-regulating valves maintain hydraulic pressure to hydraulic actuated components during normal operation, regardless of whether the pump is operating at lift pressure or hydraulic pressure. Hydraulic Supply Low Pressure Relief Valve (VR23-2) is provided to prevent over-pressurization of hydraulic supply components in the event pressure regulating valves fail or are set incorrectly. Off of the hydraulic oil supply header is a single Accumulator (AH1-1) that stores hydraulic fluid for use in transients conditions (e.g. valve actuation). The accumulator is in-service regardless of which pump is in operation. The accumulator contains an isolation valve and flow control valve to control recharge rate. A Manual Bypass Valve allows the operator to quickly depressurize and drain hydraulic oil supply header. This is useful when resetting pump compensators, relief valves, or pressure regulators. The bypass valve also serves as an accumulator drain valve. STARTIING SYSTEM: Power for startup of the gas turbine is provided by the static start system. The static start system provides variable frequency voltage and current to the generator, in this way the generator serves as the starting motor required for starting the gas turbine. The static start system consists of the following major components: 1. Load Commutated Inverter (LCI) 2. Isolation Transformer

3. LCI Disconnect Switch 4. Slow Roll Motor (Turning Gear) The turning gear provides the power necessary to breakaway and rotate the turbine prior to turbine start and also to rotate the shafting after turbine shutdown to avoid deformation of its shafting. The turning gear system consists of an induction motor, reduction gears, SSS clutch, electrical isolation, and flexible coupling. The turning gear will breakaway the turbine and slow roll at 5 to 7 rpm. In the event of power failure the turning gear is equipped with a feature for manual turning of the rotor system FIRE PROTECTION SYSTEM: The carbon dioxide fire protection system used for the gas turbine unit extinguishes fires by reducing the oxygen content of the air in the compartment from an atmospheric normal of 21% to below the level necessary to support combustion (normally 15%). To reduce the oxygen content, a quantity of carbon dioxide (CO2) equal to or greater than 34% of the compartment volume is discharged into the compartment in one minute and, recognizing the reflash potential of combustibles exposed to high temperature metal, an extended discharge is provided to maintain an extinguishing concentration for a prolonged period to minimize potential reflash conditions. WASH SYSTEM: Gas turbines can experience a loss of performance during operation as result of deposits of contaminants on internal components. This loss is indicated by a decrease in power output and an increase in heat rate. The deposits of atmospheric contaminants on compressor parts occurs with the ingestion of air. The ingested air may contain dirt, dust, insects, and hydrocarbon fumes. A large portion of these can be removed before they get to the compressor by inlet air filtration. The dry contaminants that pass through the filters as well as wet contaminants, such as hydrocarbon fumes, have to be removed from the compressor by washing with a water-detergent solution followed by a water rinse. VENTILATION AND HEATING: Ventilating and heating capabilities have been incorporated into the turbine compartment, accessory compartment, gas fuel region, accessory compartment lube oil and hydraulic oil region, and load shaft compartment, with each utilizing thermally insulated side panels and roofs Gravity operated inlet dampers and CO2 latched outlet are used in the system to automatically provide a tight enclosure when the fire protection system is activated. The CO2 latched outlet dampers are normally held open by fire extinguishing agent pressure operated latches that must be manually reset after damper release. When the agent is discharged, pressure on the latch forces a piston against a spring, moving a locking lever that releases the latch allowing the damper to close

6.1.1 General Information Make: GE MS9001FA Base load conditions: Power output: 233 MW Exhaust temp.: 616.7 OC Exhaust pressure: 400 mmWC Air inlet temp.: 29.2 OC RH: 71 % No of compressor stages: 18 No of turbine stages: 3 (reaction) Hydrogen cooled Generator details: KVA: 285000 Stator current: 10.447 KA Stator volts: 15.75 KV Excitation current: 1551 A Excitation voltage: 600 V Power factor: 0.8 6.1.2 System Operation EVENT DESCRIPTION

VALUE

Time req.

Turning gear speed to Purge speed

6 rpm → 699 rpm

< 3.0 min

Turning gear speed to Flame ON

6 rpm → Ignition

14.50 min

Turning gear speed to 95 % speed (47.50 HZ)

6 rpm → 2850 rpm

22.65 min

Turning gear speed to FSNL

6 rpm → 3000 rpm

24.50 min

Turning gear speed to Synchrinisation

6 rpm → GCB close

25.00 min

Turning gear speed to Spinning reserve load

6 rpm → 25 MW

Turning gear speed to Base load

6 rpm → FSR on Temp. control

6.1.2.1

3.5 hrs

Preparation for “GT READY TO START”

 Ensure the following auxiliary drives are in service.  One CW pump (maintain discharge pressure 1.7 bar), two ACW pumps, two CCW pumps and IAC. Ensure all the standby drives are in auto.  Start the CEP and line up condensate system. Select standby CEP to auto.  Start the HP BFP and charge the feed path (Open HP & IP feed water main isolation valves and FCV isolation valves) 1FW201VB/VA & 1FW202VCA/VAA/VBA for HP and 1FW216VB/VA & 1FW217VA/VB for IP circuit. Select standby HPBFP to auto.  Close the HP & IP attemparation shut off valves.  Start LP BFP and charge the feed path. Select standby LPBFP to auto.

 Start the AC scanner air fan and ensure discharge pressure low switches got reset (1PSLLSA203AN/BN/CN and 1PSLSA201NO) and select DC fan to auto.  Take Steam bypass hydraulic oil system in to service.  Open HP steam bypass pressure control valve by 15% (15% command is GT start permissive).  Open the HRH & LP startup vent MOV by 100%.  Open HP, IP, HRH & LP main steam stop valves.  Open the following HRSG and power cycle drain valves manually. HP: Manual drain valves partial opening (30%) and MOV full open. 1MD206V & 207V – HP attemparator down stream drip leg drain 1MD208V & 209V – HP SH -2 outlet drip leg drain before main steam stop valve. IP: Manual drain valves partial opening (30%) and MOV full open. 1MD227V & 228V – IP attemparator down stream drip leg drain LP: full opening 1MD233V – LP SH-2 outlet drain which connects at down stream of drum press CV 1MD238VA – LP SH drip leg drain between LP drum pressure CV and MSSV  Start HP, LP and CPH recirculation pumps.  Maintain drum levels at start up set points Cold: HP: -300mm; IP: -500mm; LP: -400mm Worm/Hot: HP: -200mm; IP: -200mm; LP: -400mm  Ensure TSP dosing tank level is not low (1LSLCF200BNC/ANC)  Start the HP, LP and CPH recirculation pumps. Select standby pumps to auto.  Open “HRSG customer permissive page” and check GT start permissive and accordingly make through.  Ensure GTG is on turning gear (6 rpm) as per the following recommendation. Turning Gear Operation after Shutdown Description

GT

Shaft Standstill

Min. Turning Time before Startup

Hot rotor, 2.5. Close the GT excitation 6.6KV breaker from DCS. Set the manual FSR to 40% and load set point to 25MW / Load select mode. (FSR corresponding to GT spinning reserve load is 27%) Generator mode selection to voltage / AVR will switch over to auto by default. Select GT mode selector switch to AUTO or CRANK and do the Master Reset & Diagnostic reset. Check GT start permissive / Ready to start.

6.1.2.2

“GT START UP”

 Keep open the gas fuel compartment door and start turbine compartment BT fan manually from PECC and hold it till purge timer is ON. (To avoid the turbine trip incase of any small gas leaks from valve glands inside the gas fuel compartment. 88BT fan will start in auto when purge timer is completes OR turbine compartment temp > 46OC)

 Start the GT from Master control switch “START”  Following sequence will be executed.          



           

DC lube oil pump starts in auto for availability check (4.5 sec) Gas fuel aux.stop valve open command DC link field breaker closes (41DC)

6.6KV source isolator breaker (L52SS) closes Neutral ground disconnect switch (L89ND) opens Static starter disconnect switch (L89SS) closes Turbine will start accelerating. Turning gear motor stops at 45 rpm. Gas fuel vent valve will close. Trip oil drain solenoid valves will get energizes (20TV1 add 20FG1) for IGV and gas fuel system

 Gas fuel SRV open command for 1 sec Gas leak test: (duration is 160 sec from GT start command) Gas leak test will start with ASV open feedback and GT master start command. SRV leak test: FPG2 should not cross 100 psig (7 kg/cm2) in 30sec DP check: between FPG1 & FPG2 for 3 sec (If DP > 20 psig, alarm will generate) Vent leak test: FPG2 value at the time of test start, should not drop less than 150 psig (10.5 kg/cm2) in 25sec Once gas leak test is passed then turbine is accelerated to purge speed (699 rpm) and a purge timer (L2TV) of 13 min will start and same will be displayed on start up screen. Open the module-2 outlet ESDV (NG917) from CCR PLC when purge timer is initiated. (Menu → List of pages → R1→ Coalescing filter/separator → R2 → R5 → R1) If GT is started on CRANK mode, Change the mode selection to AUTO after completion purge timer. Machine will coast down just below the firing speed (420 rpm) and again rises to 420 rpm (L14HM will pickup). Igniters will get energized for 30 sec. Check the flame established in all four flame detectors channels. Once the flame is detected turbine speed will continue at 420 rpm in warm-up mode for one minute. Check the all the ventilation fans 88BT, 88BD, 88BN, 88VG will start. After completion of warm-up timer turbine acceleration will start and at 1500 rpm L14HA will pick up. At 81.3% turbine Corrected speed IGV starts opening at the rate of 6.42 deg per % of speed rise and opens up to 39.5 Deg. Between 85% to 90% speed LCI disconnect sequence enabled and completed. At 95% (2850 rpm) speed L14HS – minimum governing sped will pickup and Excitation field breaker will close. Exhaust frame cooling fans 88TK1 & 2 will start.

 At this point fuel flow will be initiated into the PM1 manifold and sub pilot-premix will be established.  Monitor the HPBFP scoop DP and maintain around 16 bar continuously.  By the time GT reaches FSNL, HP steam pressure will be 40 bar & 385 degC. Select HP bypass to auto with 40 bar set point. IP drum level will fluctuate while HP bypass opening.  Once GT speed reaches to 3000 rpm, Set the synchronizer to auto, GT will synchronize and spinning reserve load will pick up to 23 MW.  Then reduce the load set point to 18 MW and maintain to control the LP pressure & to bring up STG rolling parameters.  Take GT performance heater in to service as for the following.   When HP steam pressure is around 18 bar, select HP drip leg drains and power cycle drains to auto and observe that closes in auto.  When IP steam pressure is around 12 bar, select IP drip leg drains and power cycle drains to auto and observe that closes in auto. When the supply pressure is 11 bar and temperature is 290 degC, Gland steam FG is to be made ON.     

Gland steam exhauster fan will start Supply drain MOV will open After 5 min, leak off control valve will close and supply MOV will open Supply PCV will open and maintains the pressure at 30 mbar Select main supply MOV and drain MOV selection to LOCAL (open condition).

 Start both the vacuum pumps (seal & main pumps)  Close the vacuum breaker and fill the seal water (While filling seal water ensure that hot well quick fill valve is in close condition otherwise seal water will not be extended to vacuum breaker elevation).  Start the remaining CT fans.  When the condenser vacuum is > 600 mbarA, take LP and HRH bypass in to service. (ensure TCV set point 80 degC) HRH bypass set point to 11 bar / Auto LP bypass set point to 3.5 bar / Auto  Take SWASS in to service.  Maintain HP & IP steam temperature as per the recommended STG rolling parameters (HP: 40 bar &400degC, IP: 11 bar & 400 degC) by adjusting the attemperation flow.  Slowly close the HRH & LP start up vents and select to auto.  Select the drum level controls to auto.  Once STG reached FSNL and ready for synchronisaton, rise GT load to 25 MW to avoid HP steam pressure decay immediately after STG GCB close due to fast loading up to 38MW.

 Once STG is synchronized then slowly rise HP & HRH bypass pressure set points as per the requirement to ensure bypass valves closing in auto.  Once STG pressure control mode is changed to SPM, then select HP & HRH pressure control to Cascade mode.  Slowly rise the GT load @ 5 MW/min and accordingly rise the FSR manual setpoint.  Maintain HP & IP steam temperatures as per the required values as shown in STG control overview to avoid stresses.  STG load at around 25 MW, check that STG internal drain valves (except LP) are closed in auto.  LP steam will get enabled at STG load 60 MW.  Once LP bypass closes fully, select to cascade mode.  GT DLN mode changeover will take place from PPM to PM at a combustion reference temperature TTRF of 1238 degC (approx. load 108 MW)  At 195 MW of GT load, Duct burner purge permissive will be through.  Increase the GT load till fuel control is on temperature reference and IGV is opened fully (86O), then select machine to Base load.  Take evaporator cooler in to service. 6.1.2.3 Valve Line-Up Table 6.1.2.4 Device Summary  Following relays will pickup at various speed levels. RELAY

DESCRIPTION

SET % (rpm)

RESET % (rpm)

L14HR

HP zero speed signal

0.06 (1.8)

0.15 (4.5)

L14HT

Cool down slow roll start speed relay

1.5

(45)

1.2

(36)

L14HC

Auxiliary cranking speed relay

9.0

(270)

8.0

(240)

L14HM

Minimum speed signal

14.0

(420)

13.5 (405)

L14HA

HP accelerating speed signal

50.0

(1500)

46.0 (1380)

L14HP

Spare speed signal

91.0

(2730)

85.0 (2550)

L14HS

HP operating speed signal

95.0

(2850)

94.0 (2820)

L14HF

Field flashing speed signal

98.0

(2940)

94.0 (2820)

IGV modulation during startup (with a cleaned compressor): SPEED (rpm)

LOAD (MW)

IGV angle (deg)

6.0

----

26.5

385

----

28.5

699

----

28.5

< 2850

----

28.5

>2850

----

49.0

3000

----

49.0

3000

25.0

49.0

3000

80.0

49.0

3000

85.0

49.1

3000

100.0

52.0

3000

120.0

54.0

3000

150.0

57.0

3000

175.0

62.0

3000

200.0

67.0

3000

225.0

77.0

3000

235.0

86.0

IBH valve modulation during startup: SPEED

LOAD

IGV angle

IBH valve position

IBH flow

(rpm)

(MW)

(deg)

(%)

(kg/sec)

< 2850

----

28.5

0.0

0.0

2860

----

49.0

46.0

22.0

3000

----

49.0

70.0

31.0

3000

25.0

49.0

70.0

35.0

3000

45.0

49.0

65.0

34.0

3000

80.0

49.0

60.0

34.0

3000

90.0

50.0

55.0

32.0

3000

115.0

53.0

39.0

26.0

3000

125.0

55.0

33.0

22.0

3000

150.0

57.0

22.0

15.0

3000

175.0

62.0

15.0

11.0

3000

180.0

62.5

0.0

0.0

DLN combustion modes: Combustion mode

Condition

Fuel split

Primary / Diffusion mode

Ignition  2850 rpm (95%)

D5

Sub piloted premix (SPPM)

Between 2850 rpm  TTRF1 > 426.6 OC

D5 + PM1

GT Speed / load rpm / MW

FSNL

Piloted premix (PPM)

TTRF1 between 871.1 OC  1232.2 OC

D5 + PM1 + PM4

Premix (PM)

TTRF1 > 1232.2 OC

PM1 + PM4

6.1.2.5

Alarm Table – GT startup TIM

TIME

E

in sec

in

POINT ID

STAT E

 

DESCRIPTION

REMARKS

min 0

0.0

0

0.0

0.394

0.0

L1START_CP B L1X

L72QEX

1

EVT

1

EVT

1

SOE

MASTER START

GT START

SIGNAL

COMMAND

MASTER CONTROL STARTUP PERMISSIVE EMERGENCY LUBE OIL PUMP ON

ELOP AVAILABILITY TEST

EMERGENCY LUBE 0.441

0.0

Q 0383

1

ALM

OIL PUMP MOTOR RUNNING IF THIS IS NOT TRUE (0.7031 kg/cm2) WITHIN 5 SEC OF MASTER

0.852

0.0

L63QE1N

1

SOE

EMERGENCY LUBE

START

OIL PUMP RUNNING

PERMISSIVE L1X, THEN "LUBE OIL PUMP TEST FAILED" AND L1X WILL BE LOST

0.961

0.0

0.961

0.0

0.961

0.0

1.545

0.0

L1START_CP

0

EVT

L20FGX

1

EVT

L4

1

EVT

B

EX_41DC_CLS D

MASTER START SIGNAL GAS FUEL STOP

ASV OPEN

VALVE COMMAND

COMMAND

MASTER PROTECTIVE SIGNAL EXCITATION DC

1

EVT

41DC CLOSED

LINK BREAKER CLOSED

2.555

0.0

2.602

0.0

START_FB EX2K_RUNNI NG

1

EVT

1

EVT

RUNNING STATE

AVR RUNNING

REACHED

CONDITION

INDICATES EX2K

FEEDBACK SIGNAL

RUNNING STATUS

FROM EX21K

STATIC START 2.642

0.0

L4SS

1

EVT

MASTER START PERMISSIVE INITIATE STATIC

2.642

0.0

L83SS_CON

1

EVT

STARTER CONNECT SEQUENCE

3.721

0.1

DRV_READY

1

EVT

STATIC START DRIVE READY 52SS SOURCE

3.721

0.1

L52SSC

1

EVT

ISOLATOR BREAKER

6.6 KV BREAKER

CLOSED 5.085

0.1

L72QEX

0

SOE

EMERGENCY LUBE

ELOP STOP

OIL PUMP ON

COMMAND

EMERGENCY LUBE 5.121

0.1

Q 0383

0

ALM

OIL PUMP MOTOR RUNNING STATIC STARTER

6.349

0.1

L89NDO

1

SOE

NEUTRAL GROUND DISCONNECT SWITCH OPEN

6.517

0.1

L63QE1N

0

SOE

EMERGENCY LUBE OIL PUMP RUNNING STATIC STARTER

9.329

0.2

L89SSC

1

SOE

DISCONNECT SWITCH CLOSED STATIC STARTER

9.362

0.2

L3SS_CON

1

EVT

CONNECT SEQUENCE COMPLETE

9.808 9.808

0.2 0.2

RUNRQ1_IN RUN

1 1

EVT EVT

9.808

0.2

TORQ1

1

EVT

18.202

0.3

L14HT

1

EVT

STATIC START RUN REQUEST STATIC START DRIVE RUNNING EGD TORQUE

MACHINE STARTED ACCELERATING

REQUEST COOL DOWN SLOW

MACHINE SPEED >

ROLL START SPEED

6 RPM

RELAY 18.228

0.3

L52TG1

0

SOE

TURNING GEAR

TURNING GEAR

MOTOR # 1 RUNNING

MOTOR STOPPED

GAS FUEL SYSTEM 19.503

0.3

L63HG2L

0

SOE

HYDRAULIC PRESSURE SWITCH 2 TRIP SIGNAL GAS FUEL SYSTEM

19.506

0.3

L63HG3L

0

SOE

HYDRAULIC PRESSURE SWITCH 3 ALARM SIGNAL GAS FUEL SYSTEM

19.531

0.3

L63HG1L

0

SOE

GAS FUEL SYSTEM TRIP SOLENOIDS GOT RESET. (2 OUT OF 3 VOTING FOR TRIP)

HYDRAULIC PRESSURE SWITCH 1 TRIP SIGNAL ASV OPEN FEEDBACK

20.073

0.3

L33VS4_O

1

SOE

GAS FUEL STOP VALVE LIMIT SWITCH

RECEIVED WITH THIS FEEDBACK GAS LEAK TEST TIMER STARTS VENT VALVE OPEN LIMIT SWITCH RELEASED AFTER ISSUING CLOSE COMMAND

22.717

0.4

L33VG4

0

SOE

GAS FUEL VENT

IF OPEN SWITCH IS

VALVE LIMIT SWITCH

NOT RELEASED WITHIN 3 SEC THEN IT WILL BE ALARMED AS "GAS FUEL VENT VALVE OUT OF POSITION"

AUXILIARY 22.325

0.4

L14HC

1

EVT

CRANKING SPEED

GT SPEED > 270 rpm

RELAY GAS FUEL SPEED 27.405

0.5

L3GRV

1

EVT

RATIO VALVE COMMAND ENABLE

SRV OPEN COMMAND

BEARING LIFTING OIL 27.578

0.5

L63QB1L

1

SOE

SUPPLY PRESSURE LOW BEARING LIFTING OIL

27.740

0.5

L63QB1L

0

SOE

PRESSURE DIP DUE TO SRV OPENING

SUPPLY PRESSURE LOW GAS FUEL SPEED

28.405

0.5

L3GRV

0

EVT

RATIO VALVE COMMAND ENABLE

29.280

0.5

L33VS4_C

1

SOE

43.197

0.7

L14HM

1

EVT

GAS FUEL STOP VALVE LIMIT SWITCH MINIMUM SPEED SIGNAL GAS PURGE VALVE

51.917

0.9

L33PG6C

1

SOE

VA13-6 CLOSE LIMIT SWITCH

ASV CLOSED GT SPEED > 420 rpm PM4 PURGE VALVE - 2 CLOSED

GAS PURGE VALVE 52.064

0.9

L33PG6C

0

SOE

VA13-6 CLOSE LIMIT SWITCH GAS PURGE VALVE

55.814

0.9

L33PG5C

0

SOE

VA13-5 CLOSE LIMIT SWITCH

62.758

1.0

L33VG4

1

SOE

GAS FUEL VENT VALVE LIMIT SWITCH GAS PURGE VALVE

66.871

1.1

L33PG6O

1

SOE

VA13-6 OPEN LIMIT SWITCH GAS PURGE VALVE

69.642

1.2

L33PG5O

1

SOE

VA13-5 OPEN LIMIT SWITCH GAS FUEL SPEED

123.236

2.1

L3GRV

1

EVT

RATIO VALVE COMMAND ENABLE BEARING LIFTING OIL

123.901

2.1

L63QB1L

1

SOE

SUPPLY PRESSURE LOW BEARING LIFTING OIL

124.104

2.1

L63QB1L

0

SOE

SUPPLY PRESSURE LOW

128.735

2.1

L3GRV

0

EVT

GAS FUEL SPEED

PRESSURE DIP DUE TO SRV OPENING

RATIO VALVE COMMAND ENABLE 755.006

12.6

L2TV

1

EVT

TURBINE VENT TIMER DIFFUSER

755.075

12.6

L52BD1

1

SOE

COMPARTMENT COOLING FAN # 1

AUTO START

RUNNING 755.772

12.6

RUN

0

EVT

755.772

12.6

TORQ1

0

EVT

856.486

14.3

L14HM

0

EVT

856.772

14.3

RUN

1

EVT

856.772

14.3

TORQ1

1

EVT

865.487

14.4

L14HM

1

EVT

865.527

14.4

L2TVX

1

EVT

865.547

14.4

L30SG1

0

SOE

STATIC START DRIVE RUNNING EGD TORQUE REQUEST MINIMUM SPEED SIGNAL

SPEED HAS COME DOWN BELOW 420 rpm

STATIC START DRIVE RUNNING EGD TORQUE REQUEST MINIMUM SPEED

SPEED IS AT 420

SIGNAL

rpm - FIRING SPEED

IGNITION PERMISSIVE IGNITION EXCITER ON - CHANNEL FAULT

IGNITOR ON

EXCITER CHANNEL 866.607

14.4

Q0135

1

ALM

FAILED WITH IGNITOR ON

866.786

14.4

L33VG4

0

SOE

867.496

14.5

L33VS4_O

1

SOE

GAS FUEL VENT VALVE LIMIT SWITCH GAS FUEL STOP VALVE LIMIT SWITCH

GAS VALVES OPEN

GAS FUEL SPEED 867.567

14.5

L3GRV

1

EVT

RATIO VALVE COMMAND ENABLE

870.487

14.5

L28FDD

1

EVT

870.528

14.5

L28FD

1

EVT

870.528

14.5

L28FDC

1

EVT

870.607

14.5

L28FDA

1

EVT

FLAME DETECTOR

FLAME

CHANNEL # 4

DETECTION

FLAME DETECTED FLAME DETECTOR CHANNEL # 3 FLAME DETECTOR CHANNEL # 1

870.607

14.5

L28FDB

1

EVT

FLAME DETECTOR CHANNEL # 2 EXCITER CHANNEL

895.567

14.9

Q0135

0

ALM

FAILED WITH

IGNITOR OFF

IGNITOR ON 895.567

14.9

L2TVX

0

EVT

895.871

14.9

L30SG1

1

SOE

930.528

15.5

L2W

1

EVT

18.3

L14HA

1

EVT

19.4

Q1418

1

ALM

1096.72 9 1164.04 8 1264.39 7 1264.83 1 1271.84 5 1284.95 1 1285.16 0 1285.29 0 1346.73 1 1346.73 1 1347.49 0

IGNITION PERMISSIVE IGNITION EXCITER ON - CHANNEL FAULT TURBINE WARMUP TIMER HP ACCELERATING SPEED SIGNAL HIGH SHAFT VOLTAGE GAS PURGE INTER

21.1

L63PG3AH

1

SOE

VALVE PRESSURE HIGH SW- A PM 3 GAS PURGE INTER

21.1

L63PG3BH

1

SOE

VALVE PRESSURE HIGH SW- B PM 3 GAS PURGE INTER

21.2

L63PG3CH

1

SOE

VALVE PRESSURE HIGH SW- C PM 3

21.4

RUN

0

EVT

21.4

START_FB

0

EVT

0

EVT

21.4

EX2K_RUNNI NG

22.4

RUNRQ1_IN

0

EVT

22.4

TORQ1

0

EVT

22.5

L14HP

1

EVT

STATIC START DRIVE RUNNING RUNNING STATE REACHED INDICATES EX2K RUNNING STATUS STATIC START RUN REQUEST EGD TORQUE REQUEST SPARE SPEED SIGNAL INITIATE STATIC

1347.53 1

22.5

L83SS_DISCO N

1

EVT

STARTER DISCONNECT SEQUENCE

1348.77

SPEED > 1500 rpm

22.5

L52SSC

0

EVT

52SS SOURCE

SPEED > 2730 rpm (91 %)

ISOLATOR BREAKER

9 1349.35 3

CLOSED STATIC STARTER 22.5

L89SSO

1

SOE

DISCONNECT SWITCH OPEN

LCI DISCONNECTED

STATIC STARTER 1351.39 5

22.5

L89NDC

1

SOE

NEUTRAL GROUND DISCONNECT SWITCH CLOSED

1351.41 3 1351.41 3 1351.45 0 1351.45 0 1358.97 0 1369.53 1 1369.81 0 1370.86 6 1372.00 6 1372.09 0 1392.37 0 1475.45 6

22.5

EX_41DC_CLS D

0

EVT

22.5

STOP_FB

1

EVT

22.5

L3SS

1

EVT

22.5

EX_STOPPED

1

EVT

22.6

L14HS

1

EVT

22.8

L14HF

1

EVT

22.8

EX_STOPPED

0

EVT

22.8

22.9 22.9 23.2

EX_41DC_CLS D START_FB EX2K_RUNNI NG L3

41DC CLOSED STOP STATE REACHED SATIC START COMPLETE SEQUENCE EXCITER STOPPED, 41DC OPEN HP OPERATING SPEED SIGNAL FIELD FLASHING SPEED RELAY EXCITER STOPPED, 41DC OPEN EXCITATION DC

1

EVT

41DC CLOSED

CLOSED 1

EVT

1

EVT

1

EVT

RUNNING STATE

AVR RUNNING

REACHED

CONDITION

INDICATES EX2K

FEEDBACK SIGNAL

RUNNING STATUS

FROM EX21K

TURBINE COMPLETE SEQUENCE GENERATOR

24.6

L52GX1

1

SOE

BREAKER CLOSED AUX. 1 GENERATOR

1475.49 1

24.6

L52GX

1

EVT

BREAKER CLOSE/OPEN STATUS INPUT

1475.50

24.6

L52HG1

LINK BREAKER

0

SOE

GENERATOR

COMPARTMENT

9 1475.81 7 1475.94 5 1537.02 7 1537.16 4 1544.49 4 1564.53 2

HEATERS ON 24.6

L33CB1O

0

SOE

24.6

L33CB2O

0

SOE

25.6

L33CB3O

0

SOE

25.6

L33CB4O

0

SOE

COMPRESSOR BLEED VALVE # 1 OPEN COMPRESSOR BLEED VALVE # 2 OPEN COMPRESSOR BLEED VALVE # 3 OPEN COMPRESSOR BLEED VALVE # 4 OPEN AIR PROCESSING UNIT

25.7

L63AD4L

0

SOE

LOW PRESSURE ALARM

26.1

7902.65

131.7

7

1

7902.65

131.7

8

1

7903.16

131.7

9

2

7903.18

131.7

3

2

7903.18

131.7

4

2

11711.4

195.1

89

9

11711.4

195.1

89

9

11711.4

195.1

89

9

11711.4

195.1

L1X

0

EVT

MASTER CONTROL STARTUP PERMISSIVE GAS PURGE VALVE

L33PG6C

1

SOE

VA13-6 CLOSE LIMIT SWITCH GAS PURGE VALVE

L33PG5C

1

SOE

VA13-5 CLOSE LIMIT SWITCH GAS PURGE INTER

L63PG3CH

0

SOE

VALVE PRESSURE HIGH SW-C PM3 GAS PURGE INTER

L63PG3AH

0

SOE

VALVE PRESSURE HIGH SW-B PM3 GAS PURGE INTER

L63PG3BH

0

SOE

VALVE PRESSURE HIGH SW-A PM3 GAS PURGE VALVE

L33PG1O

1

SOE

VA13-1 OPEN LIMIT SWITCH GAS PURGE INTER

L63PG1CH

1

SOE

VALVE PRESSURE HIGH SW-C PM1 GAS PURGE INTER

L63PG1AH

1

SOE

VALVE PRESSURE HIGH SW-B PM1

L63PG1BH

1

SOE

GAS PURGE INTER

89

9

11714.2

195.2

59

4

11741.6

195.6

17

9

11741.8

195.7

71

0

11769.0

196.1

54

5

11769.2

196.1

97

5

VALVE PRESSURE HIGH SW-A PM1 GAS PURGE VALVE L33PG2C

0

SOE

VA13-2 CLOSE LIMIT SWITCH G1 PURGE VALVE

L33PG2O

1

SOE

MAXIMUM POSITION FOR SS G1 PURGE VALVE AT

L33PG2_3

1

SOE

SWEEP / LIQUID POSITION G1 PURGE VALVE AT

L33PG2_3

0

SOE

SWEEP / LIQUID POSITION G1 PURGE VALVE

L33PG2O

0

SOE

MAXIMUM POSITION FOR SS INLET AIR

13184.0

219.7

39

3

L80ACA

1

SOE

EVAPORATOR COLER PUMP MOTOR-A RUNNING

13210.6

220.1

47

8

L83B

1

EVT

BASE LOAD COMMAND

6.1.2.6 Protection Interlock Attachments\GT_Trip_Diagram_Edit.pdf 6.1.3 Flow Chart 6.2 Attachment Attachments\GT operating parameters.xls Attachments\GT Start curve. PDF 6.2.1 Fire Protection System Drawing( MLI0426 )_120e3239 6.2.2 Electrical Schematic_211d4275 6.2.3 Log Sheets Format 6.3