IN EVERY STEP OF ACHIVING ANY CONCERT, THERE IS NEED

OF GUIDENCE, INSPIRATION & HELP FOR BETTER RESULT.

I AM HEREBY THANKFULL TO FOLLOWING PERSONS FOR NOT

ONLY THEIR VALUABLE INSTRUCTIONS THAT THEY GIVEN ME

TO PREPARE THIS PROJECT REPORT BUT ALSO FOR THEIR

COOPERATION DURING TRAINING PERIOD.

1. Er. Mr. Santosh Kumar Gupta, XEN/TRG.

2. Er. S.R. Sharma, XEN/EMD-I

3. Er. Shyam Lal, AEE/EMD-I

4. Er. Harish Bhardwaj, AAE-/EMD-I

I AM EQUALLY THANKFUL TO ALL OTHER WORKERS WHO

TRIED THEIR BEST TO HELP ME & PROVIDED ME

INFORMATIONS REQUIRED FOR TRAINING AND MY FRIENDS

WHO DIRECTLY OR INDIRECTLY HELPED ME FOR COMPLETION

OF THIS PROJECT REPORT.

CERTIFICATE

To whomsoever it may concern ,Rahul Aggarwal(7EE-73) a student of

Electrical & Electronics discipline from Lingayas Inst. of Mgt. &

Tech.,Faridabad has completed his vocational training in Panipat Thermal

Power Station ,Panipat from 5th July to 4th August ,2010. During the above

period, we found him to be very sincere and hardworking. He is well mannered

and is very pleasant to move with. I have read the report submitted by him ,it

meets the expectations and it accurately reflects the work done by him.

Er. Harish Bhardwaj Er. Shyam Lal Er. S.R. SharmaAAE-I/EMD-I AEE/EMD-I XEN/EMD-I

INDEX

* INTRODUCTION

* FUNCTIONAL DESCRIPTION

* 6.6 KV SUPPLY SYSTEM

* MOTOR H.T.MOTORS L.T MOTORS

* TRANSFORMERS

* SWITCHYARD COMPONENTS

* TURBO GENERATOR

INTRODUCTION

THE SALIENT FEATURES OF THE PLANT ARE AS UNDER:

CAPACITY 4X110MW+2X210MW+2X250MW

UNIT-1 01-11-1979

UNIT-2 27-03-1980

UNIT-3 01-01-1985

UNIT-4 11-01-1987

UNIT-5 28-03-1989

UNIT-6 04-07-2001

UNIT-7 16-10-2004

UNIT-8 02-02-2005

DAILY COAL REQ.

15,000M.T.

HEIGHT OF COOLING TOWERS

123.5 mtr. IN STAGE 1&2143.5 mtr. IN STAGE 3&4140 mtr. IN STAGE 5&6

FUNCTIONAL DESCRIPTION

THE THERMAL POWER STATION BURNS FUEL & USES THE RESULTANT TO MAKE THE STEAM ,WHICH DERIVES THE TURBO GENERATOR. THE FUEL i.e. COAL IS BURNT IN PULVERISED FORM . THE PRESSURE ENERGY OF THE STEAM PROUDCED IS CONVERTED INTO MECHANICAL ENERGY WITH THE HELP OF TURBINE . THE MECHANICAL ENERGY IS FED TO THE GENERTOR WHERE THE MAGNETS ROTATES INSIDE A SET OF STATOR WINDING & THUS ELECTRICITY IS PROUDUCED. IN INDIA 65% OF TOTAL POWER IS GENERATED BY THERMAL POWER STATIONS. TO UNDERSTAND THE WORKING OF THE THERMAL POWER STATION PLANT ,WE CAN DIVIDE THE WHOLE PROCESS INTO FOLLOWING PARTS :

1.COAL FLOW:

IN COAL FIRED PLANTS, RAW MATERIAL ARE AIR &WATER .IN PTPS ,COAL IS TRANSPORTED THROUGH RAILWAY WAGONS FROM M\s. COAL INDIA & IS KEPT RESERVED ON A BUFFER STOCK .THE BROUGHT OUT TO THE STATION IS UNLODED WITH THE HELP OF WAGON TIPPLER .AFTER UNLOADING ,THE COAL IS SENT TO CRUSHER HOUSE WITH THE HELPOF CONVEYOR BELTS. THE COAL WHICH IS NOW RESUCED TO VERY SMALL PIECES,IS SENT TO THE COAL BUNKERS WITH THE HELP OF CONVEYOR BELT .THE RAW COAL IS FED TO COAL MILLS THROUGH RAW COAL FEEDERS . RAW COAL FEEDERS BASICALLY REGULATE RAW COAL TO PULVERISE MILL. THE RAW PULVERISED COAL IS FED TO THE FURNACEWITH THE HELP OF PRIMARY FAN THROUGH PULVERISED COAL PIPES .A PORITION OF THE PRIMARY AIR IS HEATED UTILISING THE HEAT OF THE FLUE GASES & THEN MIXED WITH THE COLD AIR AS PER REQUIREMENT BY THE PULVERISED COAL. NORMALLY THE TEMP. OF IS MAINTAINED AT 60 TO 70 DEGREES .THE COAL IS NOW BURNT IN THE FURNACE USING OIL IN THE BEGINNING, SHOWERD THROUGH THE NOZZLES AT DIFFERENT ELEVATIONS IN THE FURNACE .TO PROVIDE AIR FOR COMBUTION ,THE HEAT OF THE FLUE GASES ALSO HEAT IT. THE HEAT PRODUCED DUE TO COMBUTION IS UTILISED FOR THE CONVERSION OF WATER INTO STEAM .THIS WATER IS STORED IN THE BOILER DRUM .THERE ARE TWO SETS OF PIPES ATTACHED TO THE DRUM ,ONE CALLED RISER & OTHER KNOWN AS DOWN CORNER THROUGH WHICH THE WATER COMES TO THE RING HEADER & STEAM MOVES UP DUE TO THE DENSITY DIFFERENCE OF WATER & STEAM . THIS STEAM IS SUPER HEATED USING SUPER HEATERS & MEANWHILE THE FLUE GASES ARE THROUGHOUT IN THE ATMOSPHERE THROUGH CHIMNEY.

2. STEAM FLOW:

THE SUPER HEATED STEAM IS SENT TO THE TURBINE THROUGH PIPELINES.THERE ARE THREE TURBINES IN THE UNITS, USING THIS STEAM AT DIFFERENT TEMP. & PRESSURES. AFTER PASSING THROUGH HIGH PRESSURE TURBINE THE STEAM IS SENT TO THE REHEATER FOR RISING THE TEMP. OF THE STEAM.AFTER REHEATING THE STEAM IS SENT TO THE INTERMEDIATE PRESSURE TURBINE THROUGH REHEATED LINE. HERE IT LOSSES MOST OF ITS TEMP. & PRESSURE, & FINALLY SENT TO LOW PRESSURE TURBINE. THE USES OF THREE DIFFERENT TURBINES HELPS IN INCREASING THE EFFICIENCY OF THE PLANT. THE TURBINE IN TURN CONNECTING WITH A GENERATOR PRODUCES ELECTRICITY. THEN THIS ELECTRICITY IS STEPPED UPTO 220 KV WITH THE HELP OF STEP UP TRANSFORMER & SUPPLIED TO VARIOUS SUBSTATIONS/GRIDS. MEANWHILE, THE STEAM THROUGH LOW PRESSURE ( L.P.) TURBINE IS CONDENSED AND THE CONDENSED WATER IS STORED IN HOT WELL.

3. WATER FLOW:

THE CONDENSED WATER IS EXTRACTED FROM THE HOT WELL THROUGH CONDENSATE EXTRACTION PUMPS & SENT TO THE BOILER DRUM WITH THE HELP OF BOILER FEED PUMP (B.F.P.) BEFORE PASSING THROUGH LOW PRESSURE HEATER AND DEARETER. WHILE LOSS IN WATER IS MADE UP FROM C.S. TANK, WHICH HAVE D.M. MOOR IN IT. THE C.S TANK IS DIRECTLY CONNECED TO HOT WELL. THE WATER USED IN CONDENSOR IS SENT TO COOLING TOWER FOR COOLING . AFTER COOLING THIS WATER IS AGAIN SENT TO CONDENSOR WITH THE HELP OF CIRCULATING WATERPUMP. THE LOSS IS MADE UP FROM RAW WATER PUMP HOUSE THROUGH CALORIFIER PUMP HOUSE.

BOILER FEED PUMP

BRIEF EXPLANATION

1.WAGON TIPPLER:-IT IS THE MACHINE WHICH IS USED TO TIP THE COAL FROM THE WAGON . THE COAL TIPPED IS DIRECTLY FED TO CONVEYOR BELT. ITS CAPICITY IS 12 WAGON PER HOUR .

2.CRUSHER :- IT CRUSH THE COAL INTO SMALL PIECES.

3.COAL MILLS:-IN IT SMALL PIECES OF COAL ARE CONVERTED INTO PULVERISED FORM. THEY ARE 6 IN NUMBER.

4.FURNACE :- IT IS THE CHAMBER IN WHICH FUEL BURNS & FIRE BLOWS.

5.BOILER DRUM:-IT CONTAINS WATER FOR BOILING.

6.ELECTROSTATIC PRECIPITATOR:-IN THIS WE HAVE ELECTRODES WHICH ATTRACTS FLY ASH AND EXTRACT IT FROM FLUE GASES SO THAT IT CAN NOT ENTER ATMOSPHERE.

7.CHIMNEY;-IT IS USED TO RELEASE FLUE GASES INTO THE ATMOSPHERE.

8.TURBINE:-TURBINE IS THE PART WHICH REVOLVES DUE TO STEAM PRESSURE.IT IS OF THREE TYPES:

a).HIGH PRESSURE TURBINE

b).INTERMEDIATE PRESSURE TURBINE.

c).LOW PRESSURE TURBINE.

9. TURBO GENERATOR :-IT IS THE MAIN MACHINE WHICH PRODUCES 210 MW ELECTRICITY. IT IS WATER AND H2(HYDROGEN) GAS COOLED. THEREFORE IT IS CONTAINED IN CYLINDRICAL CHAMBER.

10.CONDENSOR:-IT CONDENSE STEAM COMING FROM LOW PRESSURE TURBINE(L.P.T.) TO HOT WATER.

11.COOLING WATER (C.W.) PUMP :-THIS PUMP SEND WATER FROM COOLING TOWER TO CONDENSOR.

12. COOLING TOWER :-IT IS USED TO COOL THE WATER ITS HEIGHT IS NEAR ABOUT 143.5 mtr.

13. RAW WATER PUMP HOUSE :-IT SUPPLIES RAW WATER TO THE BOILER.

14.CLEARIFIER PUMP HOUSE:-THE WATER FROM RAW IS CLEARED AT CLEARIFIER BY PUTTING ALUM IN IT & FILTERING IT & THEN SUPPLIED TO THE CONDENSOR.

15.CONDENSATE EXTRACTION PUMP:- C.E.P. PUMP IS USED TO EXTRACT THE CONDENSE WATER FROM THE HOT WELL AND SUPPLY TO THE DEAREATER AFTER PASSING THROUGH L.P. HEATER& ECONOMISIER,SO THAT HIGH PRESSURE STEAM IN THE CYLINDER CAN BE CREATED.

16.LOW PRESSURE HEATER:-IT IS USED TO INCREASE THE TEMPERATURE OF WATER, IN THIS WAY EFFICIENCY OF SYSTEM INCREASES.

17.DEAREATER : -IT IS USED TO REMOVE AIR FROM WATER,WHICH IS ENTRAPPED IN THE WATER MOLECULES. IT IS VERY IMPORTANT PART BECAUSE THE ENTRAPPED AIR EFFECT AIR DRUM BADLY.

18.BOILER FEED PUMP(B.F.P.):-IT IS THE HEAVIEST DRIVE IN THE PLANT & SUPPLY WATER TO BOILER DRUM FROM DEAREATER.

19.HIGH PRESSURE HEATER(H.P.):-IN THIS TEMPERATURE OF WATER INCREASES, THUS EFFICIENCY FURTHER INCREASES.

20.ECONOMISER:-IN THIS FLUE GASES EXCHANGE HEAT TO THE WATER TO INCREASE SYSTEM EFFICIENCY.

GENERAL WORKING DIAGRAM

6.6 KV CIRCUIT BREAKER A CIRCUIT BREAKER IS A DEVICE WHICH:-

MAKES OR BREAKS A CIRCUIT EITHER MANUALLY OR BY REMOTE CONTROL UNDER NORMAL CONDITIONS.

BREAKS A CIRCUIT AUTOMATICALLY UNDER FAULT CONDITIONS.

THUS A CIRCUIT BREAKER IS JUST A SWITCH WHICH CAN BE OPERATED UNDER NORMAL & ABNORMAL CONDITIONS BOTH AUTOMATIC OR MANUALLY. TO PERFORM THIS OPERATION ,A CIRCUIT BREAKER IS ESSENTIAL CONSISTING OF FIXED AND MOVING CONTACTS CALLED ELECTODES. WHEN A FAULT OCCURES ON POWER SYSTEM, THE TRIP COIL OF CIRCUIT BREAKERIS ENERGISED WHICH PULLS APART MOVING CONTACTS, THUS OPEN THE CIRCUIT DC SUPPLY IS USED FOR THE OPERATION OF CIRCUIT BREAKER.ON THE BASIS OF MEDIUM USED FOR A EXTINCTION THE CIRCUIT BREAKER ARE CLASSIFIED AS :

1. OIL CIRCUIT BREAKERS 2. AIR BLAST CIRCUIT BREAKER 3. SULPHER HEXAFLUORIDE CIRCUIT BREAKER .

OIL CIRCUIT BREAKER IT IS WELL KNOWN THAT WHEN A CIRCUIT CARRYING A LARGE CURRENT IS BROKEN, AN ARC OCCURS AT THAT POINT WHERE THE CONTACTS ARE SEPARATE, THE ARCHING IS SPECIALLY SEVERE WHEN HIGH VOLTAGES ARE INVOLVED AND IF A SHORT CIRCUIT OCCURS ON A HIGH VOLTAGE CABLE WHICH IS SUPPLIED FROM LARGE POWER STATION. THE ARC WOULD BE POWERFULL TO BRIDGE THE CONTACTS OF THE SWITCH AND DESTROY IT BY BURNING. THE DEVICE IS EMPLOYED AS AN OIL BREAKER. AN OIL BREAKER POSSES THE PROPERTY OF ALWAYS BREAKING AN ALTERNATIVE CURRENT AT ITS ZERO VALUE.

THESE SWITCHES ARE SUITABLE FOR A MAXIMUM VOLTAGE OF 6.6 KV. THE CONTACTS OF THESE SWITCHES , WHICH BREAKS HIGH TENSION CIRCUIT, ARE IMMERSED IN OIL TO ENSURE RAPID & EFFECTIVE RAPTURE OF THE CIRCUIT. WHEN THE ARC OCCURS, THE OIL IN ITS PATH IS VAPORISED AND THE GAS THEREBY GENERATED EXTRACT A PRESSURE ON THE SURRROUNDING OIL. THIS PRESSURE

IS UTILISED IN ARC CONTROLLED DEVICES TO CAUSE A MOVEMENT OF FRESH COOL OIL ACROSS THE PATH OF THE ARC, THEREBY EFFICIENTLY ASSISTING ITS INTERRUPTION.

SPECIFICATION:-LOW OIL CIRCUIT BREAKERTYPE – E7531/10.

1. VOLTAGE:- 6.6/11KV 2. CURRENT:- 3150 A.3. FREQUENCY:- 50HZ4. SHORT TIME CURRENT:- 50/35KA FOR 1/3 S5. BREAKING CURRENT:- 44/39.4KA6. WEIGHT:- 350KGS

TYPE:- E7512/10.1. VOLTAGE:- 6.6/11KV2. CURRENT:- 1250A3. FREQUENCY:- 50HZS4. SHORT TIME CURRENT:- 50/40KA FOR 1/3S5. BREAKING CURRENT:- 44/39.4KA6. WEIGHT:- 210KGS

TYPE:- E7525/10

1. VOLTAGE:- 6.6/11 KV 2. CURRENT:- 2500A3. FREQUENCY:- 50HZ4. SHORT TIME CURRENT:- 50/35KA FOR 1/3S5. BREAKING CURRENT:- 44/39.4KA6. WEIGHT:- 220KGS

INDEX

INCOMERTIE

LOAD1250 A CIRCUIT BREAKER2500 A CIRCUIT BREAKER3150 A CIRCUIT BREAKER

III-A1.DUMMY FOR TIE TO 5 A2.TIE TO 5 A3.DUMMY FOR TIE TO C-11-A4.TIE TO C-II A5.R.W.T. III6.F.O.T. IIIA7.BUS P.T8.S.S.T. IIIA9.S.B.T. IIA

10.TO C.H.S. IIIA 11.C.M.8A, 340KW, 325A

12.I.D.F.M. 5B, 130 KW, 147.5A13.ASH WATER RECOVERY T/F.14.H.P.W.P.M. IIIB, 260KW, 29A15.H.P.W.P.M. IIIA, 260KW, 29A16.C.W.P.M. 3C, 1265KW. 140A17.A.H.T. IIIA.18.C.L.M.T. IIIA.19.B.C.W.P.M. IIIB, 135KW, 38A20.B.C.W.P.M. IIIA, 335KW, 38A21.INCOMER22.DUMMY FOR INCOMER23.TIE FOR UNIT 6A

III-B

1. TIE TO UNIT 6B2. DUMMY FOR INCOMER 3. INCOMER 4. B.C.W.P.M. IIIC, 335 KW,38A.5. B.C.W.P.M. IIID, 335KW, 38A6. C.L.W.T. IIIB7. A.H.T. IIIB8. H.P.W.P.M. IIIC, 260KW, 29A.9. H.P.W.P.M. IIID, 260KW, 29A.10. H.P.W.P.M. IIIE, 260KW, 29A11. SPARE MOTOR 12. E.P.T.13. C.M. 8B, 340KW, 325A, 14. C.H.S. 15. S.B.T. IIIB16. S.S.T. IIIB17. BUS P.T.18. F.O.T. IIIB19. B.F.P.M. IIIB, 3500KW, 360A.20. TIE TO C- II –B 21. DUMMY FOR TIE TO C –II –B 22. TIE TO 5B23. DUMMY FOR TIE TO 5B.

INDEX

5( A )1. U.S.T.-5 2. E.P.T.-5A 3. BUS P.T.4. B.F.P.M.-5 A,3500 KW,3605. P.A.F.M-5 A,1250 KW,132 A6. F.D.F.M.-5 A,750 KW,80.2 A7. P.M.-5 A,340 KW,40.7 A8. P.M.-5B,340 KW,40.7A9. P.M.-5C,340KW,40.7A

10. I.D.F.M.-5A,1300KW,147.5A11. RECT. T/F12. C.W.M.-5A,500KW,525A

13.C.W.P.M.-5A,265KW,140A 14.INCOMER 15.DUMMY FOR INCOMER 16.TIE TO SSIII-A 17.DUMMY FOR TIE TO SSIII-A

5(B)

1. DUMMY FOR TIE TO SSIII-B2. TIE TO SSIII-B3. DUMMY FOR INCOMER4. INCOMER5. C.W.P.M.-5B,265KW,140A6. C.P.M.-5B,500KW,525A7. 11KW,TEMPORARY SUPPLY8. I.D.F.M.-5C,1300KW,147.5A9. P.M.-5D,340KW,40.7A10. P.M.-5E,340KW,40.7A11. P.M.-5F,340KW,40.7A12. F.D.F.M.-5B,750KW,80.2A13. P.A.F.M.-5B,1250KW,132A14. B.F.P.M.-5C,3500KW,360A15. BUS P.T.16. E.P.T.-5B17. SPARE MOTOR

MOTOR

A) HIGH TENSION MOTOR

HIGH TENSION MOTORS OPERATED AT HIGH VOLTAGES

IN TAU DEVI LAL THERMAL POWER STATION, THESE MOTORS ARE OPERATED AT 6.6KV. SOME OF THESE MOTORS ARE AS FOLLOWS:-

I. CIRCULATING WATER(C.W.) PUMP MOTORS :-

a).SPECIFICATIONS :- i. MAKER – B.H.E.L.ii. CAPACITY(K.W.)-1265iii. RATED VOLTAGE(VOLTS)-6600iv. RATED R.P.M.-493v. RATED CURRENT-140Avi. CONNECTINS-STARvii. DUTY- CONTINUOUSviii. INSULATION CLASS-Fix. INSTALLATION POSITION- VERTICALx. QUANTITY-3

b).FUNCTION:- C.W. PUMP IS USED TO CIRCULATE COOLING WATER TO THE CONDENSERS SO THAT LOW PRESSURE STEAM IN THE CYLINDER CAN BE CONVERTED INTO WATER.

2.C.E.P. PUMP MOTOR:-

a).SPECIFICATIONS:-i. MAKE- B.H.E.L.ii. CAPACITY-500KWiii. RATED VOLTAGE-6600Viv. RATED R.P.M.-1482v. RATED CURRENT-52.8Avi. CONNECTIONS-STARvii. DUTY-(2 WORKING,1STANDBY) CONTINUOUSviii. INSULATION CLASS-Fix. INSULATION POSITION-VERTICALx. QUANTITY-3

b). FUNCTION :-C.E.P.PUMP IS USED TO EXTRACT THE CONDENSE WATER FROM THE HOT WELL AND SUPPLY TO THE DEAREATOR AFTER PASSING THROUGH L.P. HEATER& ECONOMISIER,SO THAT HIGH PRESSURE STEAM IN THE CYLINDER CAN BE CREATED.

3.BOILER FEED PUMP(B.F.P.) MOTOR:-

a).SPECIFICATIONS:-I. MAKE- B.H.E.L.II. CAPACITY-3500KWIII. RATED VOLTAGE-6600VOLTSIV. RATED CURRENT-360AV. RATED R.P.M.-1481VI. CONNECTIONS- STAR VII. DUTY(2 WORKING,1 STANDBY)-CONTINUOUSVIII. INSULATION CLASS-FIX. QUANTITY-3

b). FUNCTION :-ITS FUNCTION IS TO SUPPLY THE WATER TO THE BOILER DRUM. IT TAKES WATER FROM THE DEAREATOR BY CREATING STRONG SUCTION. IT IS THE BIGGEST MOTOR IN THE PLANT.

4.COAL MILL MOTOR:-

a). SPECIFICATIONS:-I. MAKE-B.H.E.L.II. RATED VOLTAGE-6600III. CAPACITY-340KWIV. RATED R.P.M.-992V. RATED CURRENT-40.7AVI. CONNECTIONS- STARVII. DUTY- CONTINUOUSVIII. INSULATION CLASS-FIX. INSTALLATION POSITION – HORIZONTALX. QUANTITY-6

b).FUNCTIONS:-ITS FUNCTION IS TO GRIND THE COAL PIECES TO FINE POWDER (PULVERISED) FORM i.e. UPTO SIZE OF 25 MICRON.

5.COAL CRUSHER :- i).MAKE-N.G.F.E ii).CAPACITY-600KW iii).RATED VOLTAGE-6600V iv).RATED R.P.M.-747

v).RATED CURRENT-72A vi). CONNECTIONS-STAR vi).QUANTITY-2 b).FUNCTION:-ITS FUNCTION IS TO CRUSH THE BIG SIZE COAL PIECES TO A SIZE OF 25mili meter square, WHICH ARE THAN CARRIED TO BUNKERS THROUGH CONVEYOR BELT.

6. PRIMARY AIR FAN MOTOR:-i).MAKE-B.H.E.L.ii).CAPACITY (K.W.)-1250iii).RATED VOLTAG (VOLTS)-6600iv).RATED R.P.M.-1487v).RATED CURRENT (AMPS)-132vi).CONNECTIONS-STARvii).DUTY-CONTINUOUSviii).INSULATION CLASS-Fix).QUANTITY-3

b).FUNCTION:- ITS FUNCTION IS TO CARRY PULVERIZED COAL FROM THE COAL MILL TO THE FURNACE FOR ITS IGNITION. IT CREATES STRONG DRAFT OF AIR THAT CARRIES PULVERIZED COAL.

7). FORCE DRAUGHT (F.D.) FAN MOTOR:- i).MAKE-B.H.E.L.

ii).CAPACITY-750KWiii).RATED VOLTAGE-6600Viv).RATED R.P.M.-1490v).RATED CURRENT-80.2Avi).CONNECTION-STARvii).DUTY-CONTINUOUSviii).INSULATION CLASS-Fix).QUANTITY-2 b).FUNCTION:-F.D. FAN IS USED TO SUPPLY FRESH AIR TO THE FURNACE FOR THE PROPER IGNITION OF COAL INTO THE FURNACE.

8). INDUCED DRAFT (I.D.) FANi).MAKE-B.H.E.L.ii).CAPACITY-1300KWiii).RATED VOLTAGE-6600Viv).RATED R.P.M.-750v).RATED CURRENT-147.5Avi).CONNECTION-STARvii).DUTY-CONTINUOUSviii).INSULATION CLASS-Fix).QUANTITY-3b).FUNCTION:-ITS FUNCTION IS TO DISCHARGE FLUE GASES TO THE ATMOSPHERE THROUGH THE CHIMNEY AFTER PASSING THROUGH THE PRECIPITATOR.

9.BEARING COOLING WATER PUMP MOTOR:-a).SPECIFICATION:-i).MAKE-B.H.E.L.ii).CAPACITY-335KWiii)RATED VOLTAGE-6600Viv).RATED R.P.M.-980v).-CONNECTION-STARvi).INSULATION CLASS-Fvii).INSTALLATION POSITION-HORIZONTAL

b).FUNCTION:-IT SUPPLY COOLING WATER TO THE MOTOR &OTHER AUXILLARY FOR COOLING PUPOSES. & OTHER AUXILLARY FOR COOLING PUPOSES.

B) LOW TENSION MOTOR

LOW TENSION MOTORS ARE THOSE WHICH ARE OF 415V. THEY ARE MAINLY USED IN H.T.MOTOR AUXILLARY.

1. B.C.W. DRAIN MOTOR:-

a).SPECIFICATION:-

i).CAPACITY-136KWii).rated r.p.m.-987iii).RATED CURRENT-43Aiv).FREQUENCY-50HZv).MAKE-KRILOSKERvi).INSULATION CLASS-Bb)FUNCTION:-IT PUMP THE B.C. WATER TO THE SUMP.

2. SEAL WATER PUMP MOTOR:-

a).SPECIFICATION:-

i). CAPACITY-25KW ii). RATED R.P.M.- 1479 iii) RATED CURRENT – 43A’ iv) FREQUENCY -50HZ

v). PHASE-3vi). MAKE –NGEFvii). INSULATION CLASS –B

b).FUNCTION – IT PROVIDES A LAYER OF WATER TO THE LOWER POSITION OF BOILER IN ORDER TO SEAL IT FROM THE ENTRY OF ATMOSPHERIC AIR.

3. SEAL WATER VAPOUR EXHAUST FAN:-

a) SPECIFICATIONS –

i) CAPACITY – 1.5 KWii) RATED R.P.M. – 6205iii) RATED CURRENT – 3.1Aiv) FREQUENCY – 50HZv) PHASE –3vi) MAKE – KIRLOSKER vii) INSULATION CLASS –B

b) FUNCTION - IT PREVENTS THE ENTRY OF AIR BUBBLES IN THE TURBINE CYLINDER BY PROVIDING THE OPPOSITE PUSH.

4. CENTRIFUGE PUMP MOTOR:-

a). SPECIFICATIONS –

i). CAPACITY –7.5KW ‘ ii). RATED R.P.M-1440 iii). RATED CURRENT-14. iv). FREQUENCY –50HZ v). PHASE – 3 vi). MAKE – CROMPTON GREAVES vii). INSULATION CLASS – B

b). FUNCTION – TO CENTRIFUGE THE VAPOUR THAT ENTERS BY CHANGE IN TURBINE AN REMOVE THEM

5. ASH SLURRY PUMP MOTOR: –

a).SPECIFICATIONS –

i) CAPACITY – 100KW ii) RATED R.P.M. – 1485iii) RATED CURRENT – 176iv) FREQUENCY – 50HZ.v) PHASE - 3 vi) MAKE – NGEFvii) INSULATION CLASS – B

b). FUNCTION – TO PUMP ASH SLURRY TO THE ASH DISPOSAL AREA.

6. EMERGENCY OIL PUMP: –

a). SPECIFICATIONS

1. CAPACITY – 15 KW 2. RATED R.P.M. – 1425 3. RATED CURRENT – 1254. FREQUENCY – N.A. (DC) 5. PHASE – NOT APPLICABLE

b).FUNCTION – TO PROVIDE OIL TO THE SHAFT AND BEARING OF THE TURBINE IF SEAL OIL PUMP AND TAKING OIL PUMP FAILS.

2. RAW WATER MOTOR PUMP:–

a) SPECIFICATIONS- i).CAPACITY-90KWii).RATED R.P.M.-1450iii).RATED CURRENT-154Aiv).FREQUENCY-50HZvi).PHASE-3vii).MAKE-KIRLOSKERviii).INSULATION CLASS-B

b).FUNCTION-IT IS USE TO PUMP RAW WATER FROM THE LAKE TO THE PLANT.

3. INSTUMENT AIR COMPRESSOR :-

a).SPECIFICATIONS:- i).CAPACITY-105KW ii).RATED R.P.M-1485 iii).RATED CURRENT-184A iv).FREQUENCY-50HZ v).PHASE-3 vi).MAKE- KIRLOSKER vii).INSULATION CLASS- B b).FUNCTION- IT IS USED TO COMPRESS THE AIR USED TO CONTROL PNEUMATIC CONTROLLED INSTRUMENTS AT A PRESSURE 6 TO 7 Kg/Cm cube.

9.SERVICE AIR COMPRESSOR:-

a). SPECIFICATIONS-

i).CAPACITY-30KW ii).RATED R.P.M.-1485 iii).RATED CURRENT-184A iv).FREQUENCY-50HZ v).PHSE-3 vi).MAKE-NGEF vii).INSULATION CLASS-B

b).FUNCTION- ITS FUNCTION IS SIMILAR TO INSTRUMENT AIR COMPRESSOR.

10.CLARIFIER WATER PUMP MOTOR-

a).SPECIFICATION-i)CAPACITY-30KWii).RATED R.P.M-1470iii).RATED CURRENT-53Aiv).FREQUENCY-50HZv).PHASE-3vi).MAKE-CROMPTONvii).INSULATION CLASS-B

b).FUNCTION- IT PUMP THE FILTERED WATER FROM CLEARIFIER TO D.M. WATER TREATMENT PLANT.

TRANSFORMERS

THE TRANSFORMER IS THE MOST CONVENIENT & ECONOMICAL DEVICE FOR TRANSFER OF POWER FROM ONE VOLTAGE TO ANOTHER VOLTAGE AT THE SAME FREQUENCY. IT WORKS ON THE PRINCIPLE OF ELECTROMAGNETIC INDUCTION. THERE IS HARDLY ANY INSTALLATION WITHOUT A TRANSFORMER.DUE TO THIS EQUIPMENT,IT HAS BEEN POSSIBLE TO TRANSMIT BULK POWER TO LOAD CENTERS FROM FAR OFF POWER HOUSES AND TO VARIOUS MACHINERIES AND SWITCHGEARS OF THE POWER PLANT. TRANSFORMERS ARE OF TWO TYPES:-

#STEP-UP TRANSFORMER - WHICH STEP-UP THE VOLTAGE AT SECONDRY SIDE CALLED STEP-UP TRANSFORMER.

#STEP-DOWN TRNSFORMER- WHICH STEP-DOWN THE VOLTAGE AT SECONDRY SIDE ARE CALLED STEP-DOWN TRANSFORMER.

MAIN PARTS OF POWER TRANSFORMERS

# PRIMARY WINDING# SECONDRY WINDING# OIL TANK# DRAIN COKE# CONSERVATOR# BRETHER# TUBES FOR COOLING # TRNSFORMER OIL# EARTH POINT# EXPLOSION VENT# TEMPERATURE GAUGE# BUCHHOLZ RELAY# PRIMARY TERMINALS# SECONDARY TERMINALS

ACCESSORIES OF TRANSFORMERS

1.OIL CONSERVATOR:- OIL CONSERVATOR IS A SHORT OF DUM MOUNTED ON THE TOP OF TRANSFORMER. A LEVEL INDICATOR IS FIXID TO IT, WHICH GIVES ALARM AT LOW LEVEL. CONSERVATOR IS CONNECTED THROUGH A PIPE TO THE TRANSFORMER TANK CONTAINING OIL. THIS OIL EXPANDS & CONTRACT DEPENDING UPON THE HEAT PRODUCED & SO THE OIL LEVEL IN CONSERVATOR IS LEFT OPEN TO THE ATMOSPHERE THROUGH A BREATHER SO THAT THE EXTRA AIR MAY GO OUT OR COME IN.

2.BREATHER:- THE BREATHER IS A BOX CONTAINING CALCIUM CHLORIDE OR SILICA GEL TO ABSORB MOISTURE OF OUR ENTERING THE CONSERVATOR AS IT IS WELL KNOWN FACT THAT THE INSULATING PROPERTY OF THE TRANSFORMERS OIL IS LOST IF A SMALL AMOUNT OF MOISTURE ENTER IN IT. SO DRY AIR IS ALLOWED TO PASS THROUGH THE BREATHER. WHEN OIL LEVRL IN OIL CONSERVATOR CHANGES, AIR MOES IN & OUT OF THE CONSERVATOR. THIS ACTION IS KNOWN AS BREATHING. DRY SILICA GEL IS OF THE BLUE COLOR. IT TURNS PALE PINK AS IT ABSORBS MOISTURE . THE WET SILICA GEL CAN BE REGENERATED BY DRYING.

3.BUCHHOLZ RELAY:- THIS RELAY IS A GAS-ACTUATED RELAY WHICH IS MEANT FOR THE PROTECTING OF OIL IMMERSED TRANSFORMER FROM INSULATION FAILURE, CORE HEATING OR ANY TYPE OF INTERNAL FAULT WHICH MAY CAUSE THE HEATING OF OIL BEYOND THE SPECIFIED TEMP.. DUE TO ANY INTERNAL FAULT, OIL IS HEATED –UP & OIL VAPOUR SO FORMED CAUSESEITHER THE ALARM CIRCUIT(FOR LESS FAULT) OR TRIP THE CIRCUIT(FOR SEVER FAULT).

4.EXPLOSION VENT:- IT IS ALSO A SAFETY DEVICE OF THE TRANSFORMER WHICH PROTECTS THE TRANSFORMER TANK FROM GASES INDUCED BY & ANY TYPE OF SHORT CIRCUIT IN THE TRANSFORMER. THIS CONSIST OF A VERTICAL PIPE CLOSED BY A DIA PHARM MADE OF THIN BAKELITE SHEET. THIS DIAPHARM BURST OR SLIDES OUT IN CASE OF ABNORMAL PRESSURE INSIDE THE TANK. A DIVERTER PLATE IS USED AT THE BOTTOM OF THE EXPLOSION VENT TO ENSURE THAT GASES PROUDCE INSIDE THE TRANSFORMER ARE DIRECTED TOWARD THE BUCHHOLZ RELAY & DON’T GET COLLECTED INSIDE THE VENTILATION AND EQUILISE THE PRESSURE ON EACH SIDE OF THE DIVERTER PLATE.

5.TEMP. INDICATOR:- IT IS ALSO A PROTECTIVE DEVICE FITTED TO THE TRANSFORMER TO INDICATE TEMP.OF TRANSFORMER OIL. FOR MEASURING TEMP. OF THE OIL, BULB OF THE VAPOUR PRESSURE TYPE THERMOMETER IS PLACED IN THE HOT OIL & DIAL OF THE THERMOMETER IS MOUNTED OUTSIDE THE TANK. TWO INDICATING POINTERS BLACK AND RED ARE PROVIDED. ALARM CONTACTS ARE ALSO PROVIDED WHICH COME INTO ACTION WHEN PREDETERMINED PERMISSIBLE HIGHER TEMPARATURE IS REACHED UNDER ABNORMAL OPERATING CONDITIONS.

6.BUSHING: –THE BUSHING SERVE AS SUPPORTS And INSULATION OF THE BUS BARS AND TRANSFORMER TERMINAL. THE BUSHING CONSISTS OF PROCELAIN SHELL BODY, UPPER AND LOWER LOCATING WASHER USED FOR FIXING THE POSITION OF BUSH BAR AND MOUNTING FLANGE WITH THE HOLE DRILLED FOR FIXING BOLT AND IT IS SUPPLIED WITH AN EARTHING BOLT.

7. MAGANETIC OIL GAUGE:- THE MAGANETIC OIL LEVEL GAUGE SUPERVISES THE LEVEL OF OIL IN THE CONSERVATOR TANK. THE OIL LEVEL GAUGE IS PROVIDED ON THE TRANSFORMER ARE OF DIAL TYPE WITH MINIMUM AND MAXIMUM LEVEL MARKING AND A POINTER WHICH INDICATE THE LEVEL OF OIL IN THE CONSERVATER. SOMETIME THE SCALE IS ALSO GRADUATED FOR OIL TEMPERATURE ON THE BASIS OF ITS LEVEL.

8. TAP CHANGER:–THE VOLTAGE CONTROL OF TRANSMISSION

AND DISTRIBUTION SYSTEMS IS OBTAINED BY TAP CHANGER. TAP CHANGER ARE EITHER ON LOAD OR OFF LOAD TAP CHANGER. TAP CHANGER IS FITTED WITH THE TRANSFORMER FOR ADJUSTING SECONDARY VOLTAGE.

IMPORTANT TRANSFORMERS IN THE PLANT

1. GENERATOR TRANSFORMER (240 MVA, 15.75 KV/220KV) –

IT CONVERTS 15.75 KV WHICH IS SUPPLIED FROM GENERATOR 220KV AND SUPPLIED IT TO THE BUS BAR/ GRID.

2. STATION SERVICE TRANSFORMER (40MVA, 220KV/7KV ) –

IT CONVERTS 220KV WHICH IS COMING TO STATION FROM BBMB TO 7KV AND FED TO STATION AUXILIARY.

3. UNIT AUXILIARY TRANSFORMER (15MVA, 15.75KV/7KV) –

IT CONVERTS 15.75KV WHICH IS SUPPLIED FROM GENERATOR TO 7KV TO FED UNIT AUXILIARY.

SWITCHYARD COMPONENTS

1. SWITCH-GEAR

SWITCH GEAR IS A CONTROL SWITCH THAT CONTROL THE OPERATION OF A POWER CIRCUIT. THE TWO FUCNTION OF A SWITCH IN POWER SYSTEMS ARE –

i). TO PERMIT THE TRANSMISSION LINES TO BE CONVENIENT PUT INTO AND TAKEN OUT FROM SERVICE.ii). TO DISABLE THE SOME PLANT AND LINES WHEN THESE BECOME FAULTY, TO BE REPIDLY AND SAFELY ISOLATED BY AUTOMATIC MEANS. THE FIRST OF THESE CAN BE SERVED BY RELATIVELY SIMPLE SWITCHES THE SECOND HOWEVER REQUIRE CIRCUIT BREAKERS, WHICH ARE MORE ROBUST & CAPABLE OF BREKING THE LARGE VALUE OF FAULT POWER THAT RESULTS IN FAULTS ON MAJOR POWER SYSTEM. SINCE ALL PLANTS AND LINES ARE LIABLE TO DEVELOP FAULTS AS A RESULTS OF MECHANICAL DAMAGE, ELECTRICAL BREAKDOWN, ERRORS IN OPERATION etc. THE SIMPLE ISOLATORS SWITCH IN FAVOUR OF AUTOMATIC CIRCUIT BREAKERS EVEN FOR SWITCHING FUNCTION. THE WHOLE SWITCHGEAR ASSEMBLY CONSISTS OF TWO PARTS:-

A.PANEL - PANEL CONSISTS OF PROTECTIVE RELAYS,MOUNTIG OF POTENTIAL TRANSFORMER,CURRENT TRANSFORMER,AMMETER,VOLTMETER & ENERGY METER. THE POTENTIAL TRANSFORMER IS MOUNTED ON THE PANEL. THE PRIMARY IS CONNECTED TO 11KV & THE REDUCE VOLTAGE FROM THE SECONDARY IS GIVEN TO ENERGY METER AS LINE VOLTAGES & FOR PROTECTIVE PURPOSES.

B.TROLLY- THE TROLLY CONSISTS OF CURRENT CARYING CONTACTS CALLED ELECTRODES. THESE ARE NORMALLY ENGAGED BUT IN PREDETERMINED CONDITIONS, SEPARATE TO INTERRUPT THE CIRCUIT, WHEN THE CONTACTS ARE MADE.

2 BUS BAR ARRANGEMENT

CONDUCTORS TO WHICH A NUMBER OF CIRCUITS ARE CONNECTED CALLED BUS – BARS. IN POWER PLANTS, SHUT DOWN RESULTS DISSCONECTION OF SUPPLY TO A LARGE AREA. HENCE TO AVOID SHUT DOWN THE MAJOR PLANTS SHOULD HAVE ELABORATE BUS BAR ARRANGEMENT WITH DUPLICATE BUSES, ALTERNATIVE SUPPLY ARRANGEMENT SECTION etc. THE EXTRA HIGH VOLTAGE EQUIPMENTS SUCH AS ISOLATORS, CIRCUIT BREAKER ARE GENERALLY COSTLY HENCE UNNECESSARY EQUIPMENT SHOULD NOT BE PROVIDED.

1. SINGLE BUS BAR ARRANGEMENT:- THE SINGLE ARRANGEMENT CONSISITS OF A SINGLE (THREE PHASE) BUS BAR TO WHICH VARIOUS FEEDERS ARE CONNECTED. IN CASE OF FAULT OR MAINTENANCE OF BUS, THE ENTIRE BUS BAR HAS TO BE DE-ENERGISED AND THE TOTAL SHUTDOWN RESULTS. THIS SCHEME IS MOST ECONOMICAL AND SIMPLE.

2. DOUBLE BUS BAR ARRANGEMENT:-THE DOUBLE BUS SYSTEMS PROVIDE ADDITONAL FLEXIBILITY, CONTINUITY OF SUPPLY AND PERMIT PERIODIC MAINTENANCE. IN THE EVENT OF FAULT ON THE BUS BAR THE OTHER CAN BE USED THE FIGURE SHOWS TO THE BUS BAR ARRANGEMENT.THERE ARE TWO BUSES CALLED MAIN BUS AND RESEVE BUS . THE COUPLER CAN BE CLOSED SO AS TO CONNECT TWO BUSES WHILE TRNASFERRING THE POWER TO THE RESERVE BUS.

i) CLOSED BUS COUPLER, THE TWO BUSES ARE NOW AT SAME POTENTIAL.

ii) CLOSED ISOLATOR ON RESERVE BUS.iii) OPEN ISOLATOR ON MAIN BUS.

3 LIGHTING ARRESTER

A LIGHTING ARRESTER IS DEVICE, WHICH PROVES LOW IMPEDENCE PATH FOR THE FLOW OF CURRENT BETWEEN THE LINE AND EARTH WHEN THE SYSTEMS VOLTAGE INCREASES MORE THAN THE DESIRE VALUE AND REGAINS ITS ORIGINAL PROPERTIES OF AN INSULATOR AT NORMAL VOLTAGE. IT IS CONNECTED BETWEEN LINE AND EARTH AT THE SWITH YARD NEAR THE TRANSFORMER.THE LIGHTING ARRESTERS ARE EXTENSIVELY USED FOR PROTECTION OF TRANSFORMERS, SWITH GEARS AND ELECTRICAL EQUIPMENTS OF OVER HEAD LINES, POWER HOUSES AND SUB-STATION . THESE ARE ALSO USE TO PROTECT THE LINE AND EQUIPMENTS FROM SKYLIGHTING.FOLLOWING ARE THE MAIN TYPE OF LIGHTING ARRESTERS-

i) HORN GAP LIGHTING ARRESTER.ii) EXPULSION TYPE LIGHTING ARRESTERS.iii) OXIDE FILM LIGHTING ARRESTER.iv) PELLET LIGHTING ARRESTER v) THYRITE LIGHTING ARRESTER.vi) AUTO VALUE LIGHTING ARRESTER.

EXPULSION TYPE LIGHTING ARRESTER

IT CONSISTS OF – i) A TUBE MADE OF FIBRE WHICH IS VERY EFFECTIVE GAS

EVOLVING MATERIALS. ii) AN ISOLATING SPARK GAP ( OR EXTERNAL SERIES GAP) iii) AN INTRUPTING SPARK GAP INSIDE THE FIBRE TUBE.DURING OPERATION, ARC DUE TO IMPULSE SPARK OR INSIDE THE FIBROUS TUBE CAUSES SOME FIBRE MATERIAL OF THE TUBE VOLTISE IN FORM OF GAS, WHICH IS EXPELLED THROUGH A VENT FROM THE BOTTOM OF THE TUBE, THUS EXTINGUISHING THE ARC JUST LIKE IN CIRCUIT BREAKER. SINCE THE GASES GENERATED HAVE TO BE EXPELLED, ONE OF THE ELECTRODE IS HOLLO AND DIVERTER IS OPEN AT ITS LOWER END.

THYRITE LIGHTING ARRESTER:-

THIS TYPE OF LIGHTING ARRESTER CONSISTS OF NUMBER OF DISCS OF INORGANIC CERAMIC COMPOUND. THESE DISCS ARE PLACED IN A SERIES HAVING SOME GAPS IN BETWEEN THEM AND ARE SEALED IN A PROCELAIN TUBE. THIS TUBE HAS MATELLIC CAP AND ELECTRODES AT ITS END. THE COMPOUND USED FOR DISCS SERVE AS AN INSULATOR BUT CHAGES TO A GOOD CONDUCTOR WHEN VOLTAGES ACROSS IT RISES TO A CERTAIN PREDETERMINED VALUE. IT IS USED UPTO 220KV SYSTEMS.

LIGHTING ARRESTER

210 MW TURBO GENERATOR

GENERAL:-

MODERN FEATURES OF DIRECT COOLING BY WATER & HYDROGEN ARE INCORPORATED IN THE 210 MW TURBO GENERATOR, THUS EVOLVE AN ECONOMICAL & RELIABLE DESIGN. THE MACHINE IS PROVIDED WITH A FAST ACTING EXCITATION SYSTEM & DEPENDABLE AUXILLARY SERVICE TO GIVE PROLONGED TROUBLE FREE OPERATION OVER THE YEARS. ALL THE MATERIAL THAT GOES INTO THE MANUFACTURE OF THIS MACHINE SUBJECTED TO VARIOUS TEST AS PER NATIONAL & INTERNATIONAL STANDARDS. EACH COMPONONETS UNDERGOES SERIES OF STAGEWISE TESTS. DESCRIPTION OF VARIOUS PARTS IS GIVEN BALOW:-

1.STATOR WINDING AND INSULATION:-

THE STATOR HAS A THREE PHASE, DOUBLE LAYER, SHORT CHORDED, BAR TYPE WINDING, HAVING TWO PARALLEL PATS. EACH COIL SIDE CONSISTS OF GLASS INSULATED SOLID AND HOLLOW CONDUCTORS WITH COOLING WATER PASSING THROUGH THE PATTER. THE ELEMENTARY CONDUCTORS ARE ROEBEL TRANSPOSED IN THE SLOT POETION OF WINDING TO MINIMISE EDDY CURRENT LOSSES.ADEQUATE PROTECTION IS PROVIDED TO AVOID CORONA & OTHER DISCHARGES. IN THE SLOTS, THE SIDES ARE FIRMLY HELD IN THE POSITION BY FIBOROUSSLOT WAGES, WHICH ARE MECHANICALLY STRONG AND HAVE HIGH DIELECTRIC PROPERTIES. THE OVERHANG PORTION OF THE COIL IS SECURELY LASHED WITH GLASS CHORD TO BONDAGE RINGS& SPECIAL BRECKETS OF NON MAGNETIC STEEL, WHICH ARE IN TURN FIXED TO THE CORE PRESS RINGS. ON SHORT CIRCUITS THE FORCES BETWEENTHE CONDUCTOR TEND TO OPEN THE CONE FORMED BY OVERHANG PORTION OF THE COILS , BUT THE MOVEMENT IS EFFECTIVELY PRESENTED BY SUPPORTS & LASHINGS.

2.DISTILLATE HEADERS OR STATOR WATER HEADER:-

RING TYPE WATER HEADERS, MADE OF COPPER ARE PROVIDED SEPERATELY FOR DISTILLATE INLET & OUTLET IN THE STATOR ON TURBINE SIDE. THE HEADERS ARE SUPPORTED ON INSULATORS AND ISOLATED FROM STATOR BODY. THE WINDING ENDS ARE SOLEDLY SOLDERED INTO THE COIL LUGS WHICH ARE THAN ULTRASONICALLY TESTED. INDIVIDUAL BARS ARE PROVIDED WITH WATER INLET/OUTLET

CONNECTIONS MADE OF P.T.F.E. HOUSES. THE BAR HEADS ARE INSULATED BY FIBRE MOULDED CORNERS. THE WINDING SCHEME ALONG WITH THE WATER CONNECTIONS. THE COMPLETE WATER PATH ASSEMBLTY IS SUBJECTED TO THE RIGID HYDROATIC PNEUMATIC TESTS AT VARIOUS STAGES TO ENSURE WATER TIGHTNESS AND TO DETECT BLOCKING OF THE FLOWS PATHS.

3.TERMINAL BUSHINGS :-

WATER COLLED TERMINAL BUSHINGS ARE HOUSED IN THE LOWER PART OF THE STATOR ON THE SLIP RING SIDE. PROCELAIN INSULATORS ARE PROVIDED TO INSULATE THE TERMINAL BARS FROM THE STATOR BODY. EFFECTIVE SEALING IS PROVIDED BETWEEN THE TERMINAL BUSHINGNAND THE STATIR BIDY TO AVOID ANY POSSIBILITY OF LEAKAGE OF HYDROGEN. TERMINAL BUSHING ARE HOUSED INSIDE A CHAMBER MADE OF NON MAGNETIC STEEL PLATES. THREE PHASE TERMINALS ARE BROUGHT OUT TO FACILITATE EXTERNAL CONNECTIONS. THE TERMINAL PLATE OF THE END TERMINALS, WHERE BUS BAR CONNECTIONS ARE MADE IS SILVER PLATED.THE TERMINAL BUSHINGS CAN BE REPLACED WITHOUT REMOVING THE STATOR FROM FOUNDATION. PROVISION IS MADE FOR FIXING THE EXTERNAL BUS DUCTS WITH THE TERMINAL PLATE.

4.ROTOR:-

THE ROTOR IS OF CYLINDRICAL TYPE SHAFT AND BODY BEING FORGED IN ONE PIECE FROM CHROMIUM, NICKEL,MOLYBENDUM & VANADIUM STEEL. PRIOR TO MATCHING, A SERIES OF COMPREHENSIVE ULTRASONIC EXAMINATION AND OTHER TESTS ARE CARRIED OUT ON ROTOR BYODY AND SHSFT PORTION TO ENSURE OF ANY INTERNAL DEFECTS. THE ROTOR WITH ALL THE DETAILS ASSEMBLED , DYNAMICALLY BALANCED TO A HIGH DEGREE OF ACCURACY AND SUBJECTED TO 20% OVER SPEEDING FOR 2 MINUTES ENSURING MECHANICAL STRENGTH.

5.FIELD WINDING:- THE FIELD WINDING IS MADE FROM HARD DRAWN SILVER BEARING COPPER. ROTOR WINDING IS HELD IN POSITION AGAINST CENTRIFUGAL FORCES BY DURALIUM FORCES WEDGES IN THE SLOT PORTION & BY NON MAGNETIC STEEL RETAINING RINGS IN THE OVER HANG PORTION . GAP PICK UP SYSTEM IS EMPLOYED FOR DIRECT HYDROGEN COOLING OF ROTOR WINDING. SEVERAL GROUPS OF VENTILATION DUCTS ARE MULLED ON THE SIDES OF THE ROTOR COIL FOR GAS PASSAGE. THE ROTOR SLOT WEDGES ARE OF SPECIAL PROFILES WITH ELLIPTICAL HOLES ROLLED IN TO MATCH THE VENTILATION DUCTS ON THE WINDING STACKS. THE END WINDINGS ARE INSULATED FROM RINGS

WITH THE HELP OF GLASS EPOXY MOULDED SEGMENTS. COPPER SEGMENTAL TYPE DAMPER WINDING IS PROVIDED IN THE END ZONE OF

ROTOR MORDWS TO PREVENT OVER HEATING OF RETURNING RING S DURING ASSYMETRICAL & ASYNCHRONOUS OPERATION.

6.SHAFT MOUNTED FANS:-

FOR CIRCULATING THE COOLING GAS INSIDE THE GENSRATOR, TWO PROPELLER TYPE FANS ARE SHAFT MOUNTED ON THIS & OF ROTOR BODY. FAN HUBS ARE MADE FROM ALLOY STEEL FORGING AND ARE HOT FITTED ON THE ROTOR SHAFT WITH SUFFICIENT INTERFERENCE . THE ALLOY STEEL CAST FAN BLADES ARE MACHINED IN THE TAIL PORTION TO SUIT THE FAN HUB AND HELD IN POSITION WITH THE HELP OF CONICAL PINS. THE BLADES CAN BE EASILY REMOVED FROM OR ASSEMBLED IN THE FAN HUB. FAN SHIELDS FIXED TO THE END SHIELDS, GUIDE THE FLOW OF GAS THROUGH THE FAN SECTIONS.

7.SLIP RINGS:-

THE SLIP RING CONSISTS OF HELLICALLY GROOVED ALLOY STEEL RINGS SHRUNK ON THE ROTOR SHAFT & INSULATED FROM IT. FOR CONVENIENCE IN ASSEMBLY BOTH THE RINGS ARE MOUNTED ON A SSINGLE, COMMON STEEL BUSH, WHICH HAS AN INSULATED JACKET PRE MOULDED ON IT. THE COMPLETE BUSH WITH SLIP RING IS SHRUNK ON THE ROTOR SHAFTS. THE SLIP RINGS ARE PROVIDED WITH INCLINED HOLES FOR SELF-VENTILATION. THE HELICAL GROOVES CUT ON THE OUTER SURFACE OF THE SLIP RINGS IMPROVES BRUSH PERFORMANCE.

TURBO GENERATOR RATINGS CAPACITY IN KW- 210000 POWER FACTOR- 0.85 CAPACITY IN KVA- 247000 STATOR:-a).15750 V b).90.60A ROTOR:-a).310V. b).2600A ROTOR R.P.M.- 3000 FREQUENCY- 50HZ PHASE- 3 CONNECTION- STAR COOLENT- H2+H2O NO. OF POLES- 2

TURBO GENERATOR

TRAINING REPORTON

PANIPAT THERMAL POWER STATION

By: ROLL NO:

ELECTRICAL ENGINEERING