Prasad Raidu
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TURBINE CONTROL LOGIC FOR “MAIN TURBINE(TD-0301)”
IN EPRU
By
V R N V PRASAD RAIDU CH
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Topics
EPRU PLANT
TURBINE TD-0301
WOODWARD SYSTEM DESCRIPTION
CONTROL SCHEMES
TURBINE PROTECTION SYSTEM
WOODWARD SYSTEM HARDWARE DETAILS
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Residue gas
compression
Inlet gas
compressionAminetreating
Amine Regeneration
MSDehydration
Cryogenicplant
C2 C3storage
Propylene Refrigeration
MSRegeneration
Inlet gas
Lean gas
EPRU PLANT
Back
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TURBINE TD-0301
Manufacture : Siemens
Performance Details: Shaft:
Power: 21431 kWSpeed: 8932 Rpm
Inlet
Extraction 1
Extraction 2
Exhaust
Flow Pressure Temperature
149.9 T/Hr
18.83 T/Hr
74.57 T/Hr
104 kg/cm2
42.5 kg/cm2
3.5 kg/cm2
0.16 kg/cm2
490oC
370oC
150oC
57.1oC
Back
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Woodward Micronet TMR control system
Used for
Turbine controlTuning gear controlTurbine trip signal generation
HMI systemOverview of pictures of the turbineAllows for alarm annunciationMonitoringTrendingManual operation
Serial communicationCPU-A : RS-232 communication for Citect systemCPU-B : RS-232 communication for DCS systemCPU-C: Woodward service tools
Control software moduleGAP
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Control schemes
1. Condenser pump logic scheme
2. Ratio limiter logic
3. IP/LP extraction enable logic
Back
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Logic:
1. If the selection switch on LCP is selected for ‘Manual’ then pumps can be started and stopped from LCP
PB’s or from MMI PC in CR. Logic scheme does not come in line.
2. If selection switch on LCP is selected for ‘Auto’ then following logic scheme will be effective. One more
selection switch on LCP is provided for preference selection between pump 1 and pump 2.
When selection switch on LCP is changed over from ‘Manual’ to ‘Auto’ position, running pump/pumps
will stop. On LAH, selected pump will start automatically. On LAH preference selected pump will start automatically. The preference selected pump will remain in
running condition even after LAH reset(i.e. normal level) If under normal condition preference selected pump is running, then on LAH other pump will not start
automatically. However if electric fault feedback is received from MCC for preference selected (existing
running) pump then on LAH other pump will start automatically. ON LAHH both pumps will start automatically. If LAHH does not reset within 45 seconds then turbine
will trip. ON LALL both the pumps will trip. Both the pumps will remain in stop condition till LAH. ON LAH
preference selected pump will start automatically.
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RATIOLIMITER
Speed controllersignal
Extractioncontroller 1signal
Extractioncontroller 2signal
HP driver signal ( % )
IP driver signal ( % )
LP driver signal ( % )
SC
PCE1
PCE2
1. HP governor valve opening:
= 0.641*{(SC.PID+61.6)+((PCE1.PID-100)*0.714)+((PCE2.PID-100)*.098)}
2. IP governor valve opening:
=1.304*{(SC.PID+61.6)-81.6+((PCE1.PID-100)*(-0.2))+((PCE2.PID-100)*.098)}
3. LP governor valve opening:
= 1.379*{(SC.PID+61.6)-108.6+((PCE1.PID-100)*(-0.2))+((PCE2.PID-100)*.098)}
Ratio limiter
Back
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HP driver signal from ratio limiter > 34.9 %
Speed > 6277 rpm
AndIP/LP Extraction enable
IP/LP Extraction enable:
Back
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Turbine protection system
1. Casing temperature protection
2. Differential pressure protection
3. Turbine trips
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Average casing temperature of HP stage less than 160oC
Average temperature difference of the HP and IP stage > 40oC
Average temperature difference of the HP and IP stage < - 40oC
No failure of input signals
Reference speed > 1500 rpm
Reference speed < 2500 rpm
OR
AND
Casing temperature protection
Speedincreaseblocked
Back
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LP stageupstreampressure
LP stageExtractionpressure
SUB
LP stageExtractionpressure
Characteristiccurve
P2
If (P1-P2)>0
P1
AND
No signal failure
Shutdown
Differential pressure protection ( LP stage )
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HP stageupstreampressure
HP stageExtractionpressure
SUB
HP stageExtractionpressure
Characteristiccurve
P2
If (P1-P2)>0
P1
AND
No signal failure
Shutdown
Differential pressure protection ( HP stage )
Back
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Turbine trips Power up Minimal two card failure All speed sensor fail TE-5936 Extraction temperature(HP side) high TE-5938 Extraction temperature(LP side) high TE-5934 Exhaust steam temperature high Protech 203 Over speed trip PS-5932 Turbine tripped pressure switch PSHH-5936 Exhaust pressure high high No speed/sticky rotor Micronet Over speed trip HP Redundancy Manager both I/H converters failure IP Redundancy Manager both I/H converters failure LP Redundancy Manager both I/H converters failure Differential Pressure IP side too high Differential Pressure HP side too high Condensate level high high HMI shutdown command
Back
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AND
AND
AND
OR
Card A fail
Card C fail
Card C fail
Card A fail
Card B fail
Card B failShut down
Minimal two card failure
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And
Speed signal SE5900A fail
Speed signal SE5900A fail
Speed signal SE5900A fail
Shut down
All speed sensor fail
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And
Extraction temperature (HP stage ) greater than 445oC
No signal failure
Shut down
Extraction temperature(HP stage ) high
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And
Extraction temperature (HP stage ) greater than 320oC
No signal failure
Shut down
Extraction temperature(LP stage ) high
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And
Exhaust steam temperature greater than 170oC
No signal failure
Shut down
Exhaust steam temperature high
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Speed > 10150 rpm Trip
Cause Effect
Protech 2o3 Overspeed trip
Trip oil pressure < 1.5kg/cm2
Trip
Cause Effect
Turbine tripped pressure switch
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And
If Exhaust pressure > 0.6 bar
If Speed > 500rpm
If the above two conditionspersist for 2 or more seconds
Shut down
Exhaust pressure high high
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If Hp valve opening > 30%
Speed < 400 rpmAnd
Shut down
No speed/sticky rotor
Micronet overspeed trip
Speed > 10178 rpm Trip
Cause Effect
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OR
OR
AND
If position error(I/H#1)> certain configurablethreshold for a configurable time
When I/H #1 pressure signal fails
When I/H#1 actuator fails
When I/H#1 not available
If position error(I/H#2)> certain configurablethreshold for a configurable time
When I/H #2 pressure signal fails
When I/H#2 actuator fails
When I/H#2 not available
SD
Both I/H converters fail(HP/IP/LP)
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AND
Condensate level > 700 mm
If above condition persist for more than 90 sec
Shut down
Condensate level high high
Back
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Woodward system hard ware details
Inputs and out puts
Redundant inputs
Redundant outputs
Redundant sensors
Fault tolerant theory
Latent fault detection
CPU module
Real time SIO module
MPU and analog output module
Back
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Field
wiring
FTM I/OMODULE
VMEMOTHERBOARD
CPU MODULEAND
APPLICATION
Fig: Input flow
CPU MODULEAND
APPLICATIONVME
MOTHERBOARD
I/OMODULE
FTM
Fig: Output flow
Back
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FTM I/OMODULE
FTM I/OMODULE
Sensor 1
Sensor 2
Application
Redundant inputs
Back
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CPU68040
Real time clock
PCMCIAMemory
card
Memory
Applicationmemory
EEPROM Boot upPROM
Switch
BusTime outgenerator
VME busarbitrator
Display port
Serial port
VMEBUS
Watch dogLow VccI/O lockFaultRun
Back
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Thank you