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1. CompuCom Institute of Information Technology & Management
Jaipur
Department of Electronics & Communication Engineering
A Practical Training Seminar
on
NTPC Kahalgaon
Presented to: Presented by:
Mr. Lokesh Kumar Arya VML Group
(HOD, ECE Department) IVth year, ECE Department

2. CONTENT
• Introduction
• History
• Process of Generation of Electricity
Coal to Steam
Steam to Mechanical Power
Power generation , Transmission & Distribution
• Electrical Equipment
• Rankin cycle
• Conclusion
• References

3. National Thermal Power Corporation
(NTPC)

4. INTRODUCTION
• NTPC, the largest power Company in India, was setup in 1975 to accelerate power
development in the country.
• NTPC has installed capacity of 29,394 MW.
• It has 15 coal based power stations (23,395 MW)
• 7 gas based power stations (3,955 MW)
• 4 power stations in Joint Ventures (1,794 MW).
• The company has power generating facilities in all major regions of the country.
• It plans to be a 75,000 MW company by 2017.

5. HISTORY
 India's largest power company, NTPC was set up in 1975 to
accelerate power development.
 NTPC is emerging as a diversified power major with presence in the
entire value chain of the power generation business.
 Apart from power generation, which is the mainstay of the company,
NTPC has already ventured into consultancy, power trading, ash
utilization and coal mining.
 NTPC ranked 341st in the „2010, Forbes Global 2000‟ ranking of the
World's biggest companies.
 NTPC became a Maharatna company in May, 2010, one of the only
four companies to be awarded this status in India.

6. NTPC KAHALGAON

7. Step-1
coal to steam
Step-2
steam to mechanical power
Step-3
power generation , transmission &
distribution

8. Step1:- Coal to Steam (Coal Handling
Plant)
 The coal is unloaded either manually or with the help of wagon
tippler into the hopper to the conveyer belt.
 Coal is passed through metal detectors in order to remove metals
present in coal.
 Stones from coal is removed manually in its journey through
conveyer belt.
 Then the coal is passed through vibrating screen where coal of 5mm
is separated from large coals.
 Then coal is crushed in crusher and passed through metal detectors to
remove iron particles.
 Coal is then supplied from coal bunker to mill. Coal dust comes out
of this mill

9. Step-2: Steam to Mechanical Power(Turbines)
High pressure turbine
• It is of single flow
design with eight
stages of blading.
• Each stage has moving
and stationary blades.
• Superheated steam(at
1100⁰c) from boiler
drum enters in to it.
• Speed-3000rpm
Intermediate pressure
turbine
• Double flow design
with seven stages of
blading on either side.
• Each stage has moving
and stationary blades.
• Reheated steam(at 535⁰
c) from H.P turbine
outlet enters in to it.
• Speed-3000rpm
Low pressure turbine
• It is also of double
flow design with 6
stages in front and rear
flow paths.
• Each stage has moving
and stationary blades.
• Stem out of I.P. turbine
directly enters in to it.
• Speed-3000rpm

10. Step-3: Power Generation,Transmission&Distribution
Rating Continuous
Active Output 110 MW
Rated Voltage 11000+/-5%V
Rated Current 7220 A
Power Factor 0.8 lagging
Frequency 50 Hz
Excitation System Static type
Field current at rated
output
1335 A
Type of cooling system Hydrogen Cooled
Hydrogen Pressure 2 Ata
No. Of H₂ cooled
elements
06
Cooling medium for H₂ Soft water

11. GENERATION
 Mechanical power produced at the shaft of the turbine is used to
rotate rotor.
 Rotating Magnetic flux produced by rotor cuts stator conductor
and from electromagnetic induction, electricity is produced .
 rotor runs at 3000 rpm, produces 3-phase voltage at 11kv , and
of 50 HZ frequency.
 Oil shielded hydrogen is used for the cooling purpose of
generator.
 In case of any fault if production of plants stops then bearing
motor rotates rotor shaft of turbine continuously at 65 rpm. This
is because if shaft doesn’t rotate then due to load it may bend.

12. TRANSMISSION
• NTPC has a capacity to generate 2340 MW of electricity.
• The transmission is done through 3-phase , double circuit
system.
• With the help of station transformer 11kv is step up to 220
kv and fed to substation.

13. DISTRIBUTION
Voltmeter and ammeter
• As the names imply they are used for measuring voltage and
current respectively.
Power meter
• Used to measure the power in standard unit of MW or
KW.
Crt screen
• A computer arrangement in which current information about
transmission line is seen.
Battery room
Consists of several batteries and chargers for emergency purpose.

14. Current transformer
• Used to reduce the current level such that it can be measured easily.
Bus isolators
• Used to isolate bus bars.
Lightning arrestor
• Used to protect the transmission line and connected equipment
during lightening .
Wave trap wave trap which changes the frequency 50Hz to 500Hz
can be used for communicate between power plants.

15. Electrical Equipments
Alternator
An alternator is coupled to a steam turbine and converts mechanical
energy of the turbine into electrical energy.
It may be hydrogen or air cooled.
The necessary excitation is provided by means of main and pilot exciters
directly coupled to the alternator shaft.
Transformers
(a) main step-transformers, which steps-up generated voltage
transmission of power
(b) station transformers, general purpose
(c) auxiliary transformers, which supply to individual unit-auxiliaries.
Switchgear
which locates fault on the system and isolate faulty part from healthy
section.
It contains circuit breakers, relays, switches and other control devices.

16. Process
1-2
•working fluid is pumped from low to high pressure.
Process
2-3
• high pressure liquid enters a boiler where it is
heated at constant pressure by an external heat
source to become a dry saturated vapor.
Process
3-4
• The dry saturated vapor expands through a turbine,
generating power.
Process
4-1
• The wet vapor then enters a condenser where it is
condensed at a constant temperature to become
a saturated liquid.
Process
3-3’
• After the vapor has passed through H.P. it is
reheated before passing through I.P. turbine.
• this prevents the vapor from condensing during its
expansion which can seriously damage the turbine
blades, and improves the efficiency of the cycle

17. CONCLUSIONS
Engineering students gain theoretical knowledge through
books. It is volatile and not of much use without knowing its
practical implementation.
Training is one of the important aspects for an engineering
student's carrier to strengthen the practical concepts. It was
an awesome experience in training as the things we all learnt
in our previous year was seen implemented practically. We
got to see the live performing equipment like Coal Handling
Plant, Turbines, Switch Yard and many more in NTPC.

18. REFERENCES
• www.wikipedia.in/ntpc
• www.goolge.co.images
• NTPC Guide Manual

19. ANY QUERY

20. THANK YOU