This document summarizes an industrial seminar presentation about the Teesta Low Dam Project-III (TLDP-III) hydroelectric power plant in India. The presentation describes the key components and technical specifications of the TLDP-III plant, including the barrage, power house, turbines, generators, transformers, switchgear, substation, dewatering/drainage systems, and protection systems. It notes that TLDP-III has a total installed capacity of 132 MW generated by 4 turbines of 33 MW each. The presentation concludes by thanking the audience and emphasizing the value of the industrial training experience.

1. INDUSTRIAL SEMINAR ON NHPC TLDP-III
PRESENTED BY:-
NAME-RANJAN KUMAR JHA
ROLL NO.-11901611072
DEPT.- ELECTRICAL ENGINEERING

2. INTRODUCTION TO HYDROELECTRIC
POWER PLANT
 IN HYDROELECTRIC POWER PLANTS THE POTENTIAL ENERGY OF WATER
STORED AT A HEIGHT IS CONVERTED INTO ELECTRICAL ENERGY.
 THE HYDROELECTRIC POWER DEPENDS ON :-
1. HEAD OF WATER.
2. DISCHARGE OF WATER.
 TOTAL POWER THAT CAN BE GENERATED IS:-
P= (0.736*W*H*Q*Ƞ/75) KW

3. INTRODUCTION TO TLDP-III
 TEESTA LOW DAM PROJECT-III WAS ENTRUSTED TO NHPC ON 15TH NOV,
2000.
 TECHNICAL FEATURES OF TLDP-III :-
LOCATION ON RIVER TEESTA IN DARJEELING (W.B)
HEAD 20 m
CAPACITY 132 MW (4 X 33 MW)
PROJECT COST Rs. 768.92 CRORES
ANNUAL GENERATION 594.07 MU
HEIGHT OF BARRAGE/LOW DAM 32.5 m HIGH (RCC RAFT WITH PIERS)
TAIL RACE CHANNEL 100 m
SWITCHYARD 220 KV GAS INSULATED SWITCHGEAR
EVACUATION OF POWER 01 LINE TLDP-III TO NEW JALPAIGURI

4. TWO MAIN PARTS OF TLDP-III
1. BARRAGE
 IN TLDP-III 140 m LONG BARRAGE HAS BEEN CONSTRUCTED ACROSS
RIVER TEESTAAT 27 MILES FROM RAMBI.
 THE HEIGHT OF THE BARRAGE IS 32.5m AND HAVING 7 GATES.

5. 2. POWER HOUSE
TLDP-III CONSISTS OF A UNDERGROUND AND SURFACE POWER
HOUSE.
POWER HOUSE OF TLDP-III CONSISTS OF: -
 PRIMARY COOLING FLOOR.
 SECONDARY COOLING FLOOR.
 TURBINE FLOOR.
 GENERATOR FLOOR.
 MACHINE HALL.
 CONTROL ROOM.

6. PRIMARY COOLING FLOOR
 LOCATED AT AN ELEVATION OF 176.5 M.
 IT IS OPEN WATER CIRCULATING SYSTEM.
 SPECIFICATION OF PRIMARY COOLING FLOOR:-
NO. OF PUMP MOTOR SET 6
RATING OF THE MOTOR 55 KW
NO. OF DUPLEX STRAINER 6
LENGTH OF RAW WATER HEADER 76.5 M
LENGTH OF DELIVERY WATER HEADER 70 M

7. SECONDARY COOLING FLOOR
 LOCATED AT AN ELEVATION OF 180.25 M.
 IT IS A CLOSED CIRCULATING SYSTEM.
 SPECIFICATION OF SECONDARY FLOOR: -
NO. OF PUMP MOTOR SET 8
RATING OF THE MOTOR 45 KW
NO. OF SIMPLEX STRAINER 4
NO. OF CYCLONE SEPERATOR 1
NO. OF HEAT EXCHANGER 5

8. TURBINE FLOOR
 THIS FLOOR IS LOCATED AT AN ELEVATION OF 184.5 M.
 THE TURBINE EMPLOYED AT TLDP – III IS KAPLAN TURBINE (VERTICAL
CONFIGURATION).
 RATED OUTPUT OF EACH TURBINE IS 34MW.
 TYPE OF SEALING: -
• SHAFT SEAL
• MAINTENANCE SEAL

9. GENERATOR FLOOR
 THIS FLOOR IS LOCATED AT AN ELEVATION OF 187.25 M.
 IN THE ALTERNATOR OF TLDP-III, THE CONSTRUCTION OF ROTOR IS
SALIENT-POLE TYPE & THE STATOR WINDING IS OF Y-CONNECTED TO LINE.
 IN TLDP-III THE EXCITATION SYSTEM IS STATIC, DIGITAL & CONSTANT-
VOLTAGE TYPE WITH CONTROLLED THYRISTORS.
 SPECIFICATION OF ALTERNATOR: -
RATED SPEED 136.36 RPM
RATED FREQUENCY 50 Hz
RATED OUTPUT 36670 KVA
RATED CURRENT 1924.7 AMP
RATED VOLTAGE 11000 ±10% VOLTS
RATED POWER FACTOR 0.9
RATED FIELD VOLTAGE 118 VOLTS
CONNECTION STAR-2 FOLD PARALLEL

10. MACHINE HALL
 THE ELEVATION OF MACHINE HALL IS 190.5M.
 THE MACHINE HALL HAS FOLLOWING INSTALLATIONS: -
1. OPU & GCP
2. EXCITATION CONTROL BOARD.
3. OPU CONTROL BOARD.
4. UNIT CONTROL BOARD.

11. CONTROL ROOM
 THE ELEVATION OF CONTROL ROOM IS 190.5M.
 THE WHOLE PLANT IS CONTROLLED THROUGH SCADA (SUPERVISORY
CONTROL AND DATAACQUISITION).
 IN TLDP-III THERE ARE TWO SERVER NAMELY SERVER A & SERVER B.
 CONTROL ROOM HAS TWO MORE ROOM, THEY ARE: -
1. BATTERY ROOM
2. LTAC ROOM

12. LIST OF IMPORTANT INSTALLATIONS IN TLDP-III
WORKING PRESSURE: -
HP COMPRESSOR:- 68 BAR
LP COMPRESSOR:- 7.8 BAR.
ROLE OF HP COMPRESSOR: -
 PROVIDES AIR PRESSURE TO OIL PRESSURE UNIT (OPU)
 AIR IS PROVIDED TO LP COMPRESSOR FROM HP COMPRESSOR.
ROLE OF LP COMPRESSOR: -
 PROVIDES AIR FOR SERVICE.
 PROVIDES PRESSURE TO THE MAINTENANCE SEAL.
 FOR BRAKING PURPOSE.
1. HP & LP COMPRESSOR: -

13. 2. HIGH PRESSURE OIL SYSTEM (HPOS)
 HPOS IS USED TO CREATE AN OIL FILM IN BETWEEN THRUST PAD AND
THRUST COLLAR.
 ROTOR IS ROTATING ON THIS OIL FILM.
 HPOS HAS TWO MOTORS OF SAME RATING.
 ONE OF THEM IS AC AND ANOTHER ONE IS DC MOTOR.
 AT A TIME ONLY ONE IS OPERATED.

14. 3. OPU
 USED TO CONTROL THE RUNNER BLADES AND GUIDE VAN.
 THE OPERATING PRESSURE IS 57 TO 62 BAR.
 IN OPU TANK RATIO OF OIL AND AIR IS IN 60 : 40.

15. 4. TRANSFORMERS
 IN TLDP-III ON THE BASIS OF WORKING THERE ARE SIX TRANSFORMERS
USED FOR EACH INDIVIDUAL UNIT.
THEY ARE AS FOLLOWS: -
1. GENERATOR TRANSFORMER (GT).
2. UNIT AUXILIARY TRANSFORMER (UAT).
3. SERVICE STATION TRANSFORMER (SST).
4. EXCITATION TRANSFORMER (ET).
5. LIGHTING ARRESTER VOLTAGE TRANSFORMER (LAVT).
6. NEUTRAL GROUNDING CUBICLE (NGC).

16. 5.GAS INSULATED SWITCHGEAR
 USED TO CONTROL, PROTECT AND ISOLATE ELECTRICAL EQUIPMENT.
 SWITCHGEAR IS THE COMBINATION OF ELECTRICAL SWITCHES, ISOLATORS &
CIRCUIT BREAKERS.
 SULPHUR HEXAFLUORIDE GAS ACT AS THE INSULATING MEDIUM.

17. 6. SUBSTATION
 IN TLDP-III THERE IS A SMALL SUBSTATION ON THE ROOF OF GIS
BUILDING.
 SUBSTATIONS GENERALLY HAVE SWITCHING, PROTECTION AND CONTROL
EQUIPMENT AND TRANSFORMERS.
 THERE ARE TWO NUMBER OUTPUT LINES OF 220 KV.
 NO. OF WAVE TRAP IS FOUR.

18. 7. DEWATERING & DRAINAGE SYSTEM
1. DRAINAGE SYSTEM: -
A. USED TO DRAIN OUT LEAKAGE WATER OF THE PLANT TO THE RIVER.
B. FOR THIS PURPOSE TWO 90 KW MOTOR IS USED.
2. DEWATERING SYSTEM: -
A. USED TO DRAIN OUT WATER IN BETWEEN INTAKE GATE AND DRAFT
TUBE AT THE TIME OF MAINTENANCE.
B. FOR THIS PURPOSE SIX 90 KW MOTOR IS USED.

19. 8. PROTECTION SYSTEM
 VITAL INSTALLATION FOR POWER PLANT.
 IN TLDP-III THERE ARE SEVERAL TYPES OF PROTECTION TO PROTECT
IMPORTANT COMPONENTS USING SEVERAL TYPES OF RELAYS: -
 GENERATOR PROTECTION.
 BUS-BAR PROTECTION.
 TRANSFORMER PROTECTION.
 LINE PROTECTION.
 FIRE FIGHTING SYSTEM: -
 USE OF CO2
 USE OF WATER

20. CONCLUSION
I WOULD LIKE TO SAY THAT THIS TRAINING IS AN EXCELLENT OPPORTUNITY
FOR ME.
THE MAIN OBJECTIVES OF THIS INDUSTRIAL TRAINING ARE TO OBSERVE AND
PRACTICE HOW THE BASIC MACHINE KNOWLEDGE AND ENGINEERING IS
APPLICABLE IN THE REAL INDUSTRIES.
IT IS NOT ONLY TO GET TECHNICAL EXPERIENCE BUT ALSO TO OBSERVE
MANAGEMENT PRACTICE AND HOW TO INTERACT WITH FELLOW WORKERS.

21. THANKYOU!