Turbine x curves
- 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
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- 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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