A PRESENTATION ON 660MW TURBO-GENERATOR ,ITS AUXILIARIES AND ASSOCIATED SYSTEMS OF - PowerPoint PPT Presentation

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A PRESENTATION ON 660MW TURBO-GENERATOR ,ITS AUXILIARIES AND ASSOCIATED SYSTEMS OF

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  1. A PRESENTATION ON 660MW TURBO-GENERATOR ,ITS AUXILIARIES AND ASSOCIATED SYSTEMS OF STAGE – I OF SIPAT SUPER THERMAL PROJECT

  2. STEAM TURBINE K-660-247

  3. LMZ (LENINGRADSKY METALLICHESKY ZAVOD) • K STANDS FOR KLAPAN LTD.,BULGARIA WHICH SUPPLIES TURBINE,NOZZLES,DIAPHRAGMS, SEALS,BLADES ETC.

  4. GENERAL INFORMATION • TG DECK IS VIS SUPPORTED AND HAS 26 CONCRETE COLUMNS (T1 – T26). • TG HALL IS CONSTITUTED OF 3 MAINS ROWS OF COLUMNS – A,B ,C ROW AND TWO BAYS – AB BAY AND BC BAY. THE WIDTH OF AB BAY IS 36m AND BC BAY IS 12m • CONDENSER TUBE BANKS (CW PATH) HAS AN INCLINATION OF 40. • THERE ARE TWO MAIN EOT CRANES FOR TG HALL.EACH EOT CRANE IS HAVING A CAPACITY OF 200t FOR MAIN HOIST AND 20t FOR AUXILIARY HOIST. 35.5m IS THE MAXIMUM VERTCAL DISTANCE A HOIST CAN TRAVEL.TANDEM OPERATION OF TWO EOT CRANES ARE ALLOWED.

  5. RATED CONDITIONS • LOAD : 660MW • BEFORE HP STOP VALVE • STEAM PRESSURE : 247KSC • STEAM TEMPERATURE : 5370C • STEAM FLOW : 2023.75T/HR • AFTER HPC • STEAM PRESSURE : 48KSC • STEAM PRESSURE : 298.710C • BEFORE IP STOP VALVE • STEAM PRESSURE : 43.2KSC • STEAM TEMPERATURE : 5650C • STEAM FLOW TO REHEATER : 1681.12T/HR. • DESIGN CONDENSER PRESSURE : 0.105KSC (abs.) • COOLING WATER FLOW : 64000M3/HR • FINAL FEED WATER TEMP. : 286.350C • FREQUENCY RANGE : 47.5 – 51.5 Hz

  6. STEAM TURBINE Generator rated speed 3000 rpm Generator manufacturer Electrosila No. of bleedings 8 Length of the turbine 36.362 m No. of stages HPT 17 IPT 11x2 LPT-1 5x2 LPT-2 5x2 Total 59 SIPAT

  7. STEAM TURBINE Parameters Pr. Before HPC SV 247.0 Ksc Temp. before HPC SV 537.0 0C Steam flow 2023.75 TPH Pr. After HPC 48.0 Ksc Temp. after HPC 298.71 0C Pr. Before IP SV 43.2 Ksc Temp. before IP SV 565.0 0C Steam flow to reheat 1681.12 TPH Design Cond pr. 0.105 Ksc CW flow 64000 TPH Final FW Temp. 286.35 0C SIPAT

  8. STEAM TURBINE Turbine Governing system Mode of Governing Nozzle Type E/H Control fluid Firequel-L make Supresta-USA Normal Operating Pr. 50 Ksc Capacity 600 lpm Fluid pump motor rating 200 KW Filter material Ultipor Mesh size 25 µ SIPAT

  9. STEAM TURBINE Lube oil system Lube oil Tn-22C Russia Mobil DTE Oil light Teresso 32 In accordance with ISO VG 32 Absolute viscosity 16.7 Centipoise Kinematic viscosity -32 Centistokes Specific gravity 0.89 Flash point 180 0C Fire point 240 0C Oil requirement per bearing N1 200 lpm N2 200 lpm N3 450 lpm N4 280 lpm N5 350 lpm N6 350 lpm N7 350 lpm N8 350 lpm N9 600 lpm N10 600 lpm SIPAT

  10. STEAM TURBINE Lube oil system Total oil system capacity 52000 lit Full volume of oil tank 58000 lit Material of tank SS Normal lube oil pressure 1.2 Ksc Oil temp at inlet of bearings Normal 55 0C Maximum 59 0C Piping SS Seal steam system Source of gland sealing system During normal operation End glands of HPC & IPC During low load operation End glands of HPC & IPC + AS Quantity of seal steam required 3.54 TPH Seal steam pressure at turbine glands 1.1-1.2 Ksc Seal steam temperature at turbine glands 160 0C SIPAT

  11. TURBINE SEAL STEAM • TWO HEADERS OR COLLECTORS ARE THERE i.e. HOT • COLLECTOR AND COLD COLLECTOR. • INITIAL SOURCE OF STEAM SUPPLY IS APRDS (UNIT HT,16KSC,310OC). • PRESSURE AND TEMPERATURE OF COLD HEADER OR COLLERTOR ARE 1.1TO1.15 KSC ABSOLUTE AND 140TO 180OC RESPECTIVELY. • PRESSURE AND TEMPERATURE OF HOT HEADER OR COLLERTOR ARE 1.1TO1.15 KSC ABSOLUTE AND RESPECTIVELY.

  12. STEAM TURBINE Turbine Protection Over speed trip 110-112 % Low lube oi pressure 0.3 (g) Ksc Low vacuum trip 0.3 (abs) Ksc Thrust bearing excessive wear trip +1.2/-2.0 mm Pressure relief diaphragm setting 1.2 (abs) Ksc SIPAT

  13. STEAM TURBINE Materials of construction HP Outer casing 15Cr1Mo1V HP blade/carrier casings 15Cr1Mo1V IP Outer casing 15Cr1Mo1V LP inner casing Steel 3 LP Outer casing Steel 3 HP Shaft 25Cr1Mo1V IP Shaft 25Cr1Mo1V LP Shaft 26CrNi3Mo2V Moving blades HPT first stage blades 18Cr11MoNiVNb (1-5) HPT other stages 15Cr11MoV (6-17) IPT first stage 18Cr11MoNiVNb (1-3) IPT other stages 15Cr11MoV (4-11) LPT last stage 13Cr11Ni2W2MoV LPT other stages 20Cr13 (1-2) LPT other stages 15Cr11MoV (3-4) SIPAT

  14. STEAM TURBINE SIPAT • Fixed blades • HPT first stage 18Cr11MoNiVNb (1-5) • HPT other stages 15Cr11MoV (6-17) • IPT first stage 18Cr11MoNiVNb • IPT other stages 15Cr11MoV • LPT first stage 12Cr13 (1-4) • LPT Other stages 08 Cr13 (5) • Number of stages • HPT • Impulse stages 1 • Reaction stages 16 • IPT • Impulse stages 22 • Reaction stages 0 • LPT • Impulse stages 20 • Reaction stages 0 • All rows of blades are integrally shrouded

  15. STEAM TURBINE SIPAT No. of HP Stop valves 2 No. of HP Control valves 4 Type of control valve unit Block united No. of IP Stop valves 2 No. of IP Control valves 4 Type of control valves Separate No. of Journal bearings for turbine 8 No. of Journal bearings for Gen 4 No. of thrust cum journal bearing 1 Type of thrust bearing Tilting Type of journal bearing 6-Fixed & 2-Tilting pad Material of bearing shell Alloy steel Type of lining Babbit LPT diaphrams 4

  16. SIPAT STEAM TURBINE • Turbine model No K-660-247 • Generator model No TBB-660-2T3 • Strainers are installed in the steam chests of the stop valves • In HPT, having passed the control stage and 8 stages which generate left jet of steam (from generator towards front bearing) steam changes its direction 180° and flows between internal and external cylinders to 8 stages of right jet (towards generator) • In CRH lines, NRV has a bypass with electric valve and control valve to enable counter flow mode of HPT with the aim of warming up of cylinder and high pressure cross over pipes at turbine start up and cold condition • HPT has nozzle steam distribution system • IPT has throttle steam distribution system • On each upper half (cover) of low pressure cylinder four membrane type relief valves are installed which are activated when the absolute pressure in exhaust nozzles rises up to 1.35 –1.4 Ksc absolute

  17. TG SEAL STEAM SYSTEM SIPAT

  18. HPT SEAL STEAM CONNECTION TO BLED STEAM TO LPH # 4 1ST CHAMBER 2ND CHAMBER HPT TO 2nd CHAMBER EXHAUST TO BLED STEAM TO D/A TO HOT SEAL STEAM HEADER TO GSC

  19. IPT SEAL STEAM CONNECTION IPT TO COLD SEAL STEAM HEADER TO GSC

  20. LPT SEAL STEAM CONNECTION LPT FROM COLD SEAL STEAM HEADER TO GSC

  21. IN HIGH PRESSURE DRAINAGE EXPANSION TANK A VALVES IN DRAINAGE COLLECTORS FROM EXTRACTION STEAM PIPES TO HPHs (10MAL20AA110, 10MAL20AA120, 10MAL20AA140) AND IN LOW PRESSURE DRAINAGE EXPANSION TANK VALVES IN DRAINAGE COLLECTORS FROM EXTRACTION STEAM PIPES TO LPHs(10MAL30AA110, 10MAL30AA120) CLOSE AUTOMATICALLY IF TURBINE LOAD INCREASES OVER 200MW AND AT THE SAME TIME ALL VALVES ARE OPEN IN THE CORRESPONDING STEAM EXTRACTION FROM THE TURBINE TO HPHs AND LPHs. • VALVES IN DRAINAGE PIPES OF HPBP AND LPBP (10MAL30AA107, 10MAL30AA108) CLOSE AUTOMATICALLY IF TURBINE LOAD INCREASES OVER 30MW.

  22. CONTROL FLUID SYSTEM • FIRE RESISTANT SYNTHETIC HYDRAULIC FLUID FYRQUEL – L MANUFACTURED BY “SUPRESTA” IS USED AS OPERATING FLUID.ITS SELF IGNITION TEMPERATURE IS ABOUT 740OC. • OPERATING PRESSURE IS APPROXIMATELY 50KSC. • OPERATING TEMPERATURE IS 45-55OC. • CONTROL OIL SUPPLY UNIT CNSISTS OF A RESERVOIR (10MAX10BB001)OF CAPACITY 7.0m3 ,2NOS.OIL COOLERS(10MAX10AC001,10MAX10AC002),DE-AERATOR,MESH FILTER,FINE FILTER(10MAX18AT001),DUPLEX FILTER(10MAX14AT001) AND 2 NOS. OF VERTICALLY MOUNTED CENTRIFUGAL PUMPS(10MAX11AP001,10MAX12AP001) DRIVEN BY AC MOTOR (1W+1S).EACH PUMP IS HAVING A CAPACITY OF 36m3/h AND DISCHARGE PRESSURE IS 50KSC. • CONTROL FLUID RESERVOIR IS SEPERATED BY TWO NUMBERS OF TANDEM MESHES OF CELL SIZE 0.25mm INTO TWO SECTIONS ,DIRTY AND CLEAN. DE- AERATOR IS INSTALLED INSIDE THE RESERVOIR INFRONT OF MESHES AND IT CONSISTS OF SLOPING PLATE ASSEMBLY. • CF FINE FILTER FOR REMOVING MECHANICAL IMPURITIES IS INSTALLED IN RESERVOIR. DURING NORMAL OPERATION CF IS SUPPLIED TO THE FINE FILTER THROUGH AN ORIFICE OF DIAMETER 4mm FROM UNSTABILIZEDPRESSURE LINE VIA VALVE 10MAX18AA501 . AFTER THAT IT IS DISCHARGED IN THE DIRTY CHAMBER OF THE RESERVOIR. WHEN TURBINE IS STOPPED CF IS SUPPLIED TO THE FINE FILTER WITH THE HELP OF ANOTHER PUMP (CF TRANSFER PUMP,10MAX19AP001,CAPACITY 4m3/hr, AND DISCHARGE PRESSURE 25KSC) VIA VALVES 10MAX19AA503 AND10MAX19AA504 FOR FILTERING PURPOSE KEEPING MAIN PUMPS IN OFF CONDITION.

  23. OIL PURIFICATION IS CONTINUOUS DUE TO FILTERING OF ITS PART VIA CONCURRENTLY MOUNTED WORKING FILTER CARTRIDGES INSTALLED INSIDE THE FINE FILTER HOUSING. • FILTER CARTRIDGES DESIGN ALLOWS USAGE OF DIFFERENT FILTERING MATERIAL. • METAL SEMI-PINCEBECK MESH WITH FILTERING DEGREE OF 70 MICRONS TO FLUSH SYSTEM AFTER INSTALLATION OR MAINTENANCE. • FILTER BELTING FABRIC WITH FILTERING DEGREE 30 – 40 MICRONS FOR PRIMARY REFINING DURING TURBINE OPERATION. • FILTERING ELEMENTS MANUFACTURED BY ”PALL” WITH FILTERING DEGREE 12 MICRONS FOR CONTINUOUS OIL FILTERING DURING TURBINE OPERATION. • OCCURRENCE OF PRESSURE OF 0.1 TO 0.3KSC IN FILTER HOUSING WITHIN 1-3 HOURS SHOWS CORRECT ASSEMBLY OF FILTER AND ITS PROPER OPERATION. • IT IS NECESSARY TO SWITCH OFF THE FINE FILTER AND REPLACE FILTERING ELEMENTS IF PRESSURE IN FILTER HOUSING RISES UPTO 2KSC.WHICH SHOWS CONTAMINATION OF FILTER FABRIC. • INSIDE FILTER HOUSING THERE IS A RELIEF VALVE BYPASSING FLUID BESIDES FILTER CARTRIDGES WHEN THEY ARE CONTAMINATED AND PRESSURE RISES UPTO 5KSC. • AN OIL LEVEL GAUGE WITH ALARM SYSTEM WHISKERS (10MAX10CL001,10MAX 10CL002) IS PROVIDED IN THE CLEAN SIDE OF THE RESERVOIR. • NORMAL OPERATING LEVEL IS 700mm FROM THE UPPER COVER (30 GRADUATION OF L.G.) AND THE AMOUNT OF CF IS 2.5m3

  24. MAXIMUM ALLOWALABLE UPPER LIMIT (WITH CF PUMPS IN STOPPED CONDITION) IS 150mm FROM THE UPPER COVER (85 GRADUATION OF L.G.) AND MINIMUM OPERATING LEVEL IS 800mm (20 GRADUATON OF L.G.) FROM THE UPPER COVER. • CF PUMP STOPS AUTOMATICALLY INCASE OF RESERVOIR OIL LEVEL LOW-LOW. • FOR VISUAL OVSERVATION OF OIL LEVEL ,LEVELGLASSES HAVE BEEN PROVIDED IN THE BOTH SIDES (DIRTY AS WELL AS CLEAN). • DIFFERENTIAL PRESSURE SWITCH (10MAX10CP001) HAS BEEN PROVIDED TO WARN ABOUT INCREASE IN PRESSURE DIFFERENCE IN SIDE THE MESH FILTER. ALLOWABLE DIFFERENCE IN MESHES DOESNOT EXCEED 150mm. • THE STANDBY CF PUMP STARTS WHEN THE RUNNING ONE TRIPS OR SYSTEM PRESSURE DROPS TO 36KSC. • IT TAKES 2 MINS FOR THE SYSTEM TO GET PRESSURIZED. • IF SYSTEM PRESSURE DROPS TO 20KSC (10MAX14CP001) AND STOP VALVES START CLOSING ,THE OPEARTING PUMP WILL STOP AND NO SIGNAL WILL BE GENERATED TO START THE STAND BY PUMP (SENSING OIL LEAKAGE). • CF PUMP ALSO TRIPS ON FIRE PROTECTION. • DUPLEX FULL PASSAGE FILTER WITH FILTERING DEGREE 20-25MICRONS IS INSTALLED IN GENERAL PRESSURE COLLECTOR OF CONTROL SYSTEM.IF PRESSURE DIFFERENCE (10MAX14CP301,10MAX15CP301) ACROSS THE RUNNING FILTER REACHES 0.8KSC,THE STANDBY FILTER HAS TO BE TAKEN INTO SERVICE.

  25. 2NOS.OF CF COOLERS (A&B) ARE INSTALLED IN THE CF SUPPLY LINE BEHIND THE DUPLEX FILTER. THESE COOLERS ARE DOUBLE PASS (BY WATER) SURFACE HEAT EXCHANGERS WITH TUBULAR DESIGN ,WATER STREAM FLOWS INSIDE THE TUBES AND CONSIST OF 148 TUBES OF SIZE 16X1500mm AND HEAT EXCHANGE AREA 25m2.CF FLOWS FROM TO DOWNARD. • COOLERS ARE DESIGNED FOR A MAXIMUM COOLING WATER PRESSURE OF 10 ± 0.5KSC AND CF PRESSURE OF 68.7 ± 0.5KSC.CFFLOW RATE TO EACH COOLER IS 50m3/hr AND PRESSURE DROP IS 0.2KSC. CWFLOW RATE TO EACH COOLER IS 80m3/hr AND PRESSURE DROP IS 0.194KSC. • FOR HYDRODYNAMIC FLUSHING OF PIPELINES DURING MAINTENANCE,THERE IS A BYPASS VALVE (10MAX14AA501)TO THE COOLERS WHICH SHOULD BE CLOSED AND SEALED DURING ROUTINE OPERATION. • IN THE INPUT AND OUTPUT TO THE COOLERS CF LINE IS PROVIDED WITH TRIPLE-PASS SWITCHING OVER VALVES WHICH PREVENT FALSE ACTIVATION OF BOTH COOLERS. • CF TEMPERATURE IS MAINTAINED (48-52OC)BY COOLING WATER FLOW VARIATION WITH THE HELP OF A FLOW CONTROL STATION CONSISTING OF A PNEUMATIC CONTROL VALVE (10PGM20AA001) AND A BYPASS MOTORIZED CONTROL VALVE(10PGM20AA002).IN CASE TEMPERATURE RISES TO 55OC (10MAX14CT001,10MAX14CT002),MOTORIZED BYPASS VALVE OPENS TO MAINTAIN THE CF TEMPERATURE. THE MAXIMUM LIMIT OF CW TEMPERATURE AT COOLER INLET IS 37OC.IF CW TEMPERATURE IS BELOW 36OC ONE COOLER CAN BE PUT OUT OF OPERATION.

  26. CF SUPPLY TO CONTROL UNITS IS CARRIED OUT BY TWO PRESSURE COLLECTORS OF STABILIZED AND UNSTABILIZED PRESSURE. • CF IS SUPPLIED TO UNSTABILIZED PRESSURE COLLECTOR THROUGH AN ORIFICE OF SIZE 22mm. STOP AND CONTROL VALVE ACTUATORS ARE FED FROM THIS COLLECTOR. • INTO STABILIZED PRESSURE COLLECTOR WHICH FEEDS OIL TO ALL CONTROL DEVICES,CF IS SUPPLIED FROM THE SECTION BETWEEN PUMPS AND THE ORIFICE. • DUE TO THE ARRANGEMENT MENTIONED ABOVE ,THE PRESSURE VARIATION IN UNSTABILIZED PRESSURE COLLEECTOR CAUSED BY INCREASE IN CF CONSUMPTION WITH OPEN ACTUATORS AFFECTS IN A LESS DEGREE PRESSURE VARIATION IN STABILIZED PRESSURE COLLECTOR. • SPRING-WEIGHT ACCUMULATOR (10MAX20BB001) IS CONNECTED TO UNSTABILIZED PRESSURE COLLECTOR TO PREVENT DECREASE IN FORWARD PRESSURE IN CASE OF LOSS AC SUPPLY TO THE PUMPS FOR 5-7SECS OR DURING PUMP CHANGE-OVER. • THE SETTING OF FLUID PRESSURE LEVEL (45KSC) TO BE ENSURED BY THE ACCUMULATOR IS DETERMINED BY A WEIGHT WHICH IS CONCRETE FILLED IN THE SITE. • ONE NRV IS INSTALLED IN THE LINE CONNECTING THE ACCUMULATOR TO THE UNSTABILIZED PRESSURE COLLECTOR. ACCUMULATOR IS FILLED WITH THE CF THROUGH AN ORIFICE OF SIZE 5mm INSTALLED IN THE BYPASS LINE OF THE NRV. • TWO EXHAUST FANS (1W+1S) ,10MAX21AN001,10MAX21AN002 (CAPACITY OF 3200m3/hr AT A HEAD OF 5-20mm OF WATER COLUMN) ARE ALSO INSTALLED TO REMOVE CF VAPOUR FROM CF RESERVOIR AND SYSTEM. • THE EXHAUSTER SWITCHES ON AUTOMATICALLY WHEN CF PUMP STARTS AND SWITCHES OFF AUTOMATICALLY WITH 15mins TIME DELAY AFTER THE STOPPING OF CF PUMP AND CF SYSTEM PRESSURE DROPS BELOW 2.0KSC.

  27. HYDRAULIC TEST OF PIPE LINES CARRIED OUT AT A PRESSURE OF 90KSC.HYDRAULICTEST SHOULD BE CARRIED OUT AFTER ASSEMBLING,OVERHAUL AND INSPECTION.

  28. SIPAT CONTROL FLUID SYSTEM

  29. SIPAT CONTROL FLUID SYSTEM • Isolation valves on pump suction & discharge side • Pump discharge pressure 50 Ksc • Capacity 41 TPH • Stabilized pressure header supply oil to servo motors of SV & CV • Un stabilized pressure header with 22 mm orifice • Accumulator in unstabilized pressure header • CF tank capacity 6.9 m3 • Duplex filter • Control fluid transfer pump to empty the CF tank • CF Temperature control by control station in the ECW line

  30. COMPONENT OF GOVERNING SYSTEM • ELECTRO-HYDRAULIC CONVERTER – SUMMER – 8 NOS. • SUMMER – 8NOS. • ELECTRO-MECHANICAL CONVERTER – 8NOS. • GOVERNING BLOCK • CONTROLGEAR(AE001) – 1NO. • EMERGENCY GOVERNOR OR OVERSPEED GOVERNOR– 1NO. • TRIP SOLENOID (AA213,AA214)-2NOS. • TEST ELECTROMAGNETS(AA211,AA212) – 2NOS. • ROTATIONAL SPEED DETECTOR -3 NOS. • LIMITER OF PRESSURE (AA502) – 1NO. • SPEED TRANSDUCER – 1NO. • LEVER OF OVER SPEED GOVERNOR (AX201)– 1NO. • PILOT VALVE FOR SUPPLY (AX202) – 1NO. • ACCUMULATOR – 1NO. • OIL SUPPLY AND PURIFIER UNIT • SERVOMOTOR OF HPSV – 2NOS. • SERVOMOTOR OF HPCV – 4NOS. • SERVOMOTOR OF IPSV – 2NOS. • SERVOMOTOR OF IPCV – 4NOS. • SERVOMOTOR OF CRH NRV – 2NOS. • LOCKING PILOT VALVE (AA001,AA002,AB001,AB002)- 4NOS. • EX.STOP VALVE SERVOMOTOR OR ESV (10LBQ10AA101)– 1NO.

  31. DIFFERENT TYPES OF OIL HEAD PRESSURE LINE (STABILIZED,50KSC,10MAX15) HEAD PRESSURE LINE ( NON-STABILIZED,50KSC,10MAX15) LINE OF PROTECTION (50KSC,10MAX51) LINE TO COCK THE OVERSPEED GOVERNOR SLIDE VALVE (50KSC) CONTROL OIL LINE TO STOP VALVE SERVOMOTORS (50KSC,10MAX16) CONTROL LNE TO SUMMATORS (35KSC,10MAX17)

  32. TURBINE PROTRCTIONS • OUT OF TOLERANCE ROTOR OVERSPEED : ALARM AT 3300RPM AND TRIPPING AT 3360RPM • OUT OF TOLERANCE AXIAL DISPLACEMENT OF ROTOR: • TOWARDS FRONT BEARING BY 0.6mm (-0.6mm) -ALARM. • TOWARDS FRONT BEARING BY 1.2mm (-1.2mm) - TRIPPING. • TOWARDS GENERATOR BY 1.4mm (+1.4mm)A- ALARM. • TOWARDS GENERATOR BY 2.0mm (+2.0mm) - TRIPPING. • LUBRICATING OIL PRESSURE DROP: ALARM AT 0.70KSC AND TRIPPING AT 0.30KSC WITH 3SECS TIME DELAY. • PRESSURE RISE IN CONDENSER:ALARM AT 0.15KSC abs. AND TRIPPING AT 0.20KSC abs. PROTECTION IS INTRODUCED AUTOMETICALLY AT UNIT START-UP AFTER PRESSURE DROP IN CONDENSER LOWER THAN 0.15KSC abs. OR AT TURBINE SPEED INCREASE OVER 1500RPM. PROTECTION IS IN OPERATION UNTIL STOP VALVES ARE OPEN • INCREASE OF BEARING VIBRATION: ALARM SOUNDS AT INCREASE OF VERTICAL OR TRANSVERSE OR AXIAL COMPONENT OF VIBRATION ON ANY BEARING OF TG SET REACHES 4.5mm/s .TRIPPING OCCURS WITH 2 SECS TIME DELAY AT INCREASE OF VERTICAL OR TRANSVERSE COMPONENT OF VIBRATION OVER 11.2mm/s ON ANY TWO BEARINGS OF TG SET.

  33. RISE IN STEAM TEMPERATURE AT HPT OUTLET: • LIVE STEAM TEMPERATURE BEFORE TURBINE FALLS BELOW 470OC: • LIVE STEAM TEMPERATURE BEFORE TURBINE RISES ABOVE 565OC: • STEAM TEMPERATURE BEFORE IV FALLS BELOW 500OC: • STEAM TEMPERATURE BEFORE IV RISES ABOVE 593OC: • MOT LEVEL LOW-LOW: • DRIP LEVEL HIGH-HIGH IN ANY HPH: • ANY FAILURE IN TURBNE CONTROL SYSTEM ELECTRONICS: • GENETERATOR PROTECTION: • FIRE PROTECTION OPERATED: • EPB PRESED.

  34. TURBINE LUBE OILSYSTEM • LUBRICATION OIL SYSTEM IS DESIGNED TO SUPPLY OIL TO TURBINE AND GENERATOR BEARINGS IN ALL TURBINE PLANT OPERATION MODES AND ALSO TO PROVIDE ROTOR JACKING OIL SYSTEM AND GENERATOR SEAL OIL SYSTEM WITH OIL. • LUBRICATION OIL IS ISO VG 32 TYPE WITH FOLLOWING PROPERTIES: • ABSOLUTE VISCOCITY : 16.7CENTIPOISE • KINEMATIC VISCOSITY : 32CENTISTOKE • SPECIFIC GRAVITY : 0.89 • SPECIFIC HEAT : 0.459Kcal/Kg Deg.C • FLASH POINT : 180OC • FIRE POINT : 240OC • DEGREE OF CLEANLINESS : 16/13 ISO 4406 • PERMISSIBLE SUSPENDED PARTICLE SIZE : 25 MICRON • WATER CONTENT : <10PPM • LUBE OILTANK IS MADE OF STAINLESS STEEL AND HAVING A CAPACITY OF 58m3 . PROVISION IS MADE FOR OIL TREATMENT INSIDE THE TANK BY PROVIDING TWO ROWS OF FLAT GRIDS WITH MESH DIMENSIONS 0.25mm LOCATED INSIDE THE TANK WHICH DIVIDES THE TANK INTO DIRTY AND CEAN COMPARTMENTS. THE AIR SEPARATOR CONSISTING OF TILTED METAL PLATES SET IS INSTALLED TO SEPARATE THE AIR DISSOLVED IN OIL. • THE OIL TANK HAS ATTACHMENTS FOR OIL DRAINING TO OIL TREATMENT PLANT FOR SLUDGE DRAIN AND TO EMERGENCY TANK INCASE OF FIRE.

  35. NORMAL OPERATING LEVEL IS 600mm FROM TANK TOP COVER.ALARM IS AT 500mm AND TURBINE TRIP IS THERE AT 400mm. • 4 NOS OF LUBE OIL PUMPS (SINGLE STAGE CENTRIFUGAL) ARE INSTALLED VERTICALLY ABOVE THE TANK .2 PUMPS (AUXILLIARY OIL PUMP) ARE ac MOTOR DRIVEN AND 2 PUMPS ARE dc (EMERGENCY OIL PUMP) MOTOR DRIVEN. • ONE PUMP WITH ac MOTOR IS CONTINUOUS RUNNING AND OTHER IS KEPT STANDBY. • EACH ac PUMP IS HAVING A DISCHARGE CAPACITY OF 300m3/hr A DISCHARGEPRESSURE OF 4.3KSC. • EOP WLL START IN CASE OF LOSS OF AC.EACH EOP IS HAVING A DISCHARGE CAPACITY OF 250m3/hr AND A DISCHARGE PRESSUREOF 2 KSC.FOR HIGHIER RELIABILITY EOP DELIVERS OIL DIRECTLY TO THE BEARING BYPASSING COOLER AND THROTTLE VALVE.

  36. SIPAT TG LUBE OIL SUPPLY SYSTEM

  37. SIPAT TG LUBE OIL SYSTEM

  38. TG LUBE OIL SYSTEM Turbine oil is ISO VG 32 KV 20-23 CST at 500C Acidity Number < 0.05 mg KOH/r Viscosity index > 90 Bearings HPT Front N1 HPT Rear N2 IPT Front (TB) N3 IPT Rear N4 LPT-1 Front N5 LPT-1 Rear N6 LPT-2 Front N7 LPT-2 Rear N8 Generator Front N9 Generator Rear N10 Exciter Front N11 Exciter Rear N12 SIPAT

  39. SIPAT TG LUBE OIL SYSTEM • DC Lube oil pump 1 No. • NRV & Isolation valve in each Lube oil pump discharge line • Oil first goes to duplex filter instead of cooler • Coolers Bypass line with isolating valve • Hydraulic Pressure control valve maintains the pressure at the center shaft level at 1.2 Ksc • PCV Bypass with throttling orifice which provides lubrication even at fully closed control valve

  40. TG LUBE OIL SYSTEM Oil is first delivered to bearing brasses through emergency tanks located on bearing cap Emergency tanks capacity in m3 N1 0.43 N2 0.35 N3 0.75 N4 0.44 N5 0.44 N6 0.44 N7 0.44 N8 0.44 N9 0.5 N10 0.44 N11 0.1 N12 0.1 SIPAT

  41. TG LUBE OIL SYSTEM Lube oil temperature control by control station in the ECW inlet line to Lube oil coolers View glasses in the oil return line from each bearing MOT Capacity 58 m3 Duplex filters fineness 25 µm Provision is made for oil cleaning by delivering a portion of oil from the oil pressure pipe to the oil tank through the fine cleaning filter with fineness of 12-15 µm Fresh oil is filled through the above filter only Oil recirculation pump to purify the oil Electrical oil heater of 152 KW capacity is provided for the preliminary oil warming in the lubrication oil tank before turbine start up by running the oil recirculation pump Oil draining to Emergency lube oil tank in case of emergency with MOV SIPAT

  42. TG LUBE OIL SYSTEM Oil trap at the suction of the vapor extractor fans Oil trap drain to lubrication oil tank Jacking oil pumps suction also given from lube oil discharge header after coolers & before control valve SIPAT

  43. SIPAT TG JACKING OIL AND BARRING GEAR SYSTEM

  44. Barring gear & Jacking oil system Automatic barring gear engagement at the rotor stop and barring gear disengaging at the start-up High pressure oil supply for bearing inserts oil jacking Barring speed 1.05 rpm Motorized barring gear Torque transfer from the barring gear motor to the turbine shaft is carried out via three stage reducer and free wheel clutch Reduction gear first stage shaft end mounts special handle for hand barring Normal source for jacking oil pumps suction is from lube oil pumps discharge header after coolers JOP discharge pressure: 120 Ksc SIPAT