Turbine x curves for unit start up

1. Turbine Rolling and
Steam Parameters
Vivek Jain

2. Modern Plant Controls
• Electro-hydraulic Turbine Control
System - High Pressure or Low
Pressure
• Distributed Digital Control System
• Data Acquisition System
• Co-ordinated Master Control
Vivek Jain

3. Turbine Critical Parameters
• Shaft Vibration < 120 microns
• Bearing Vibrations < 40 microns
• Differential Expansion
• Absolute Expansion 25.4 mm
• Axial Shift of Rotor < 0.5 mm
• Bearing Temperatures <900C
• Turbine Wall Stress Computation -
Temperature & Load Margins
Vivek Jain

4. Vivek Jain

6. There are two ways to roll the turbine
• Manual Mode
• ATRS (Automatic turbine run up
system)
Vivek Jain

7. TURBINE ROLLING FROM BARRING SPEED
BARRING SPD 240 RPM
GATE VLV
GEARING CLSD
540RPM
JOP OFF
600RPM
SOAKING OF
HPS & HPC
2850RPM
AOP OFF
3000 RPM
SOAKING OF
IPS & IPC
TUR TRIPPED
SYNC
AOP-1 ON
AT < 2800 RPM
OR
OIL PR < 4.8 KSC
JOP-1 ON
SPD < 510 RPM
GATE V/V GEAR
OPN CMD
SPD < 200 RPM
BAR SPD
MAINTAINED
 AOP-1 FAILS &
OIL PR < 4.5 KSC
AOP-2 ON CMD.
AOP-1 & 2 FAIL &
OIL PR < 1.1 KSC
EOP ON CMD.
 PR < 95 KSC
FOR 8 SEC JOP-1
OFF & JOP-2 ON
Vivek Jain

8. Using ATRS
THERE ARE THREE MODE OF OPERATION:
• AUTOMATIC MODE :WHEN SGC IS SWITCHED TO
“AUTOMATIC ON” & START UP/SHUTDOWN IS INITIATED,THEN
STEP IS SET & COMMAND IS EXECUTED IF CRITERIAS FOR THE
STEP ARE FULLFILLED.
• SEMI AUTOMATIC : IT ENABLES CONTINUATION OF
PROGRAM STEP BY STEP. ALL CRITERIA FOR A STEP IS
SIMULATED BY A SWITCH.IT IS USEFUL WHEN PROGRAM
STOPS DUE TO MISSING CRITERIA.
• OPERATOR GUIDE MODE :IN THIS SGC WILL NOT
ISSUE ANY COMMAND ,HOWEVER STEPS WILL PROCEED
SEQUENTIALLY.COMMAND HAS TO BE GIVEN MANUALLY BY
OPERATOR. Vivek Jain

9. Manual Mode
• Using EHC
• Using HC
Before going further, it is necessary to review the Governing system in brief…….
Vivek Jain

10. Turbine Governing Oil Circuit
Vivek Jain

11. KWU Turbine Steam Admission
Vivek Jain

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