Indraprastha Power Generation Co Ltd (IPGCL) and Pragati Power Corporation Ltd (PPCL) were formed in 2002 when the Delhi Vidyut Board was unbundled. IPGCL and PPCL own and operate various power plants in Delhi including gas turbine plants such as GTPS and combined cycle plants such as Pragati-I. The document provides an overview of the different power plants, their specifications and components such as gas turbines, steam turbines, generators and switchyards.

1. Summer
training
Presentation
Presented By:
Mohit Rathee 02915004909
Ashutosh Varma 04115004909

2. Indraprastha Power
Generation Co Ltd (IPGCL):
Company Profile
• With the unbundling of D.V.B. (Delhi Vidyut Board) on 01.07.2002,
• Two companies came into existence under Genco (generation company)
 Indraprastha Power Generation Co. Ltd. (IPGCL)
 Pragati Power Corporation Ltd. (PPCL)
• One transmission company (TRANSCO)
• Three distribution companies (DISCOMS)
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To learn more please visit the company's website:
http://www.ipgcl-ppcl.gov.in/

3. Why was the DVB dissolved?
•In December 1998 when the then government came to power in
Delhi
regular Delhi Vidyut
T & D losses board
power cuts accumulating
as high as for 10 to 15 liabilities of over
50% hours Rs.23000 crores
• A fast and viable alternative was required
• Delhi Electricity Board Regulatory Commission (DERC) was constituted
in May 1999 to look into the matter.
• The Government of India on July 1, 2002, implemented the reforms
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4. IPGCL / PPCL Stations at a glance
STATION Rajghat I.P. Gas Pragati-I Pragati-III
Power Turbine Power Combined Cycle Combined Cycle
House Station Gas Power Gas Power
Station Project, Bawana
Capacity
135 270 330 1500 (N)
(MW)
6 x 30 (GTs) 2 x 104 (GTs) 4 x 250 (GTs)
Units (MW) 2x67.5 + + +
3 x 30 (STGs) 1 x 122 (STG) 2 x 250 (STGs)
Synchronized on –
1985-86 (GTs)
GT-1: 11th Oct., 2010
Commissioning 1989-90 + 2002-03
GT-2: 09th Feb., 2011
1995-96 (STGs)
STG-1: 03rd Oct., 2011
Treated water From
Treated water From
Water River Yamuna River Yamuna Sen Nursing Home &
Rithala STP
Delhi Gate STPs
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5. TURBINES
The turbines used in the power generation can be of 2 types:
Steam Gas
Turbines Turbines
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6. Steam turbines: Schematic
A steam turbine is a mechanical device that extracts thermal energy from
pressurized steam, and converts it into rotary motion.

7. Steam turbines: Operation- Rankine cycle
• Water is heated in feed heaters
(A to B) using steam extracted from
the turbine.
• Within the boiler itself, heat is
used to further pre-warm the
water (in the economiser)
before it enters the evaporative
stages (C) where it boils.
• At D superheat is added until the
conditions at E are reached at the
turbine inlet.
• The steam expands in the turbine
to the conditions at point F, after
which it is condensed and returned
to the feed heater.

8. Gas turbines
A gas turbine, also called a combustion turbine, is a rotary engine that extracts energy
from a flow of combustion gas.
• The Brayton cycle was used for the GT’s in the combined cycle plants
• Energy is added to the gas stream in the combustor, where air is mixed with fuel
and ignited
• Combustion increases the temperature, velocity and volume of the gas flow
• This is directed through a nozzle over the turbine's blades, spinning the turbine
and powering the compressor
Idealized Brayton Cycle

9. Combined Cycle Power plant

10. Pragati-III Combined Cycle Gas
Power Project, Bawana
• The power plant at Bawana has a
maximum capacity of 1500 MW.
• It was set up to meet the power
requirements of Delhi, especially
with an eye on the CWG 2010.
• Foundation Stone of 1500
MW, Pragati-III Power Project at
Bawana laid by HONABLE PRIME
MINISTER, SH.MANMOHAN SINGH
ON 24-MARCH-2008.

11. Principle of Operation:
• Plant turbines work on the principle of a Combined Cycle
• Integrates two power conversion cycles - Brayton Cycle (Gas Turbines) -
Rankine Cycle (Conventional steam power plant)
• Aimed at increasing efficiency.
• The principle - the exhaust of one heat engine (Gas Turbine) is used as the
heat source for another (Steam turbine) - extracting more useful energy
from the heat, increasing the system's overall efficiency.
• The Combined Cycle Gas Turbine (CCGT) plant can achieve a thermal
efficiency of around 60%, in contrast to a single cycle steam power plant
which is limited to efficiencies of around 35-42%.

12. Observations:
The image is a section of the
single line diagram of the plant
showing:
• One GTG (Gas Turbine
Generator) and its associated
equipment CONFIDENTIAL IMAGE
• GCB (Generator Circuit Breaker)
• Gas Turbine Generator
transformer
• Excitation transformer
• IPB (Isolated Phase Busduct)
• Station auxiliary transformer
• SPB (Segregated Phase Busduct)

13. Generator
Layout description: Circuit-Breaker
Systems
HEC 7/8
• Rated maximum
voltage (kV) : 25.2
• Rated frequency
(Hz) : 50/60
• Rated peak
withstand current kA
peak: 575
• Opening time (ms):
30 ± 3

14. Bus Bar Systems: IPB(Isolated Phase Bus Duct)
The Isolated Phase Bus is made of high
grade aluminium for the Isolated Phase
Bus enclosure and the Isolated Phase
Bus conductor.

15. IPB(Isolated Phase Bus Duct)
Conductors are usually wither extruded or
rolled hollow aluminium tubes, supported
within the enclosure on porcelain or
polymer insulators.

16. Bus Bar Systems: SPB(Segregated Phase Bus Duct)

17. SPB(Segregated Phase Bus Duct)

18. Excitation systems for Gas Turbine
Generators
• Creating and strengthening the
magnetic field of the generator by
passing DC through the field winding
is known as excitation.
• The Equipment for supply, control
and monitoring of this DC supply is
called the Excitation system
• The LC2100 Static Starter is an
adjustable speed ac drive system
specifically designed (by GE) to start a
gas turbine-generator set.

19. Gas Turbine Generator Transformer
• Rating: HV and LV = 220.6 MVA
• No load voltage: HV= 420 kV
LV= 16.5 kV
• Line current: HV = 303.6 A
LV = 7728.1 A
• Vector Group: YNd11
• total weight : 266100kg

20. Steam Turbine Generator Layout
• The image is a section of the single
line diagram layout of the plant
showing one STG (steam turbine
generator).
• There is a provision for two such
units in the plant over two modules CONFIDENTIAL IMAGE
(one in each module)
• The Steam Turbine Generator has
the following specifications:
• 239.8 MW at 50 degrees
• 16.5 kV
• power factor = 0.85
• 3 Phase, 50 Hz, and
• Static Excitation

21. HRSG
(Heat Recovery steam
Generator)
• A heat recovery steam
generator or HRSG is an energy
recovery heat exchanger that
CONFIDENTIAL IMAGE
recovers heat from a hot gas
stream.
• It produces steam that can be
used to drive a steam turbine
(combined cycle).

22. RPHS (Rajghat Power House)

23. RPHS (Rajghat Power House)
• Two Units of 67.5 MW were installed
in 1989-90 at Rajghat Power House as
replacement for old Units and the
present generation capacity of this
Station is 135 MW
• It is a thermal power plant
• It uses coal which is supplied by the
NCL, BINA. The coal is sourced from
Raniganj, Bihar, and reaches the plant
via locomotive.
• The plant is situated over an area of
40 acres, and has an ash dump area
of 24 acres.

24. Turbine-Generator Arrangement

25. Turbine Specifications:
• Make: BHEL
• Capacity: 67.5 MW
• Exhaust Temperature: 44.25 deg C
• Critical speed: 1800 RPM
• Governing: Hydraulic
• Efficiency: 95 %
• Actual heat consumption: 3.85 kg/KWh
Generator Specifications:
• Make: BHEL- TARI
• Type: Turbo
• Rated Capacity: 673.5 MW/ 84.375MVA
• Power factor: 0.8 lag
• Frequency: 50 Hz
• Stator: 10.5 KV, 4639 A
• Rotor: 303 V (max.), 601 A
• Rotor S.C. ratio: 0.56
• Type of Cooling: Air

26. RPHS :Boilers

27. RPHS : Mill Bay

28. RPHS : Steam Turbine

29. RPHS : Switch Yard (220 KV)

30. GTPS
• Six Gas Turbine Units of 30 MW each were commissioned in 1985-
86, operating on liquid fuel.
• In 1990, the Gas turbines were converted to operate on natural gas.
• Later due to growing power demand the station was converted into
combined cycle gas turbine power station by commissioning 3 *34
MW Waste Heat Recovery units, in 1995-96.
• The total capacity of this station is 282 MW
• GTPS gets the gas, which is the most essential ingredient for
producing electricity by the help of turbines, from GAIL HBJ
Pipeline.
• The 220/400 KV switchyard has been located in front of the power
station.
• The 220 KV switchyard control room is accommodated in the
central control room itself.

31. Observations:

34. 2. STEAM TURBINE SPECIFICATIONS:
• Capacity 34 MW
• No of stages 50
• Steam flow 125 ton/hr
• Inlet temperature 502oC
• Inlet pressure 40 kg /cm2
• No of journal bearings 5
• No of thrust bearing 1
• Exhaust steam pressure 3.33atm
• Exhaust steam flow 2.16 ton/hr
• Exhaust pressure 0.105 kg/cm2
• Lube oil pressure 9 kg/cm2
• Over speed trip >3300 rpm
• Differential expansion +6 to -4

35. 3. GAS TURBINE SPECIFICATIONS:
• Capacity 30 MW
• Gas pressure 20 kg /cm2
• Speed 5135 rpm
• Generator speed 3000 rpm
• Generation at 11 kV
• Exhaust temperature 560oC
• Air flow 490 ton/hour

36. 4) Specifications of 66KV Current Transformer:
• No. of Course 4
• Rated Voltage 72.5KV/66KV
• Rated Current 2000-1000
• Rated Frequency 50Hz
• Total Creep age distance 1700mm
• Short time Current Rating 25 KV for 1 sec

37. 66kV
Transformer

38. 5) Specifications of 160 MVA t/f:
1) Rated Power: 160 MVA
2) Rated Voltage: L.V= 66kV
H.V = 220kV
3) Rated amperes: L.V = 1401.3A
H.V = 420.4A
4) 3 Phase, 50 Hz
5) Connection symbol: YNyn0d11
6) Year of manufacture: 2008
7) Type of cooling: OFAF

40. 160MVA
t/f
breather

41. 6) A string of unused insulator
• 6 discs = 11kV each.
• Spindle type insulator

42. PPCL-1
• To bridge the gap between demand and supply and
to give reliable supply to the capital city, a 330 MW
combined cycle Gas Turbine Power Project was set
up on fast track basis.
• This plant consists of two gas based Units of 104 MW
each and one Waste heat Recovery Unit of 122 MW.
• Gas supply has been tied up with GAIL through HBJ
Pipeline.
• Due to paucity of water this plant was designed to
operate on treated sewage water which is being
supplied from Sen nursing Home and Delhi Gate
Sewage Treatment plants.

43. THANK YOU 