This document provides information about several power companies and plants in Bangladesh:
1) APSCL is a public limited company that operates a natural gas power plant in Ashuganj with a total installed capacity of 1876 MW and present capacity of 1627 MW. It uses steam turbine, gas turbine, and combined cycle power generation methods.
2) RPCL operates a 150 MW dual fuel power plant in Kodda that can run on both natural gas and furnace oil. It has 9 diesel engines that each produce 17.4 MW of power.
3) Energypac is a leading power engineering company in Bangladesh that manufactures transformers, circuit breakers, and other substation equipment. It produces cast resin
3. INTRUDUCTION
Name of the Plant : APSCL
Established : 1966
Location : Ashuganj, B-Baria. Business
: Power Generation
No. of Gen Units :11
Type of Fuel : Natural Gas
Installed Capacity :1876 MW
Present Capacity : 1627 MW
Status :Public Limited company
4. • (5 Steam Turbine+1 GasTurbine+1GasEngine+3CCPP+1Modular)
• Unit 3 :150MW
• Unit 4 :150MW
• Unit 5 :150MW
• 225MW CCPP (GT & ST) Power Plant was commissioned on December,
2016
INTRUDUCTION
5. • Steam Turbine Power Plant
• Gas Turbine Power Plant
• Combined Cycle Power Plant
power generation method in APSCL
6. It’s operated by
1. The Brayton cycle (Gas turbine)
2. 2. The Rankine cycle (Steam turbine)
A combined cycle power plant uses both a gas and a steam turbine
together to produce upto 50% more electricity from the same fuel
than a traditional simple cycle plant.
COMBINE CYCLE POWER PLANT
7. • GAS TURBINE SECTION
• 1)compressor
• 2)combustion chamber
• 3)Gas turbine
• 4)Diesel engine
• STEAM TURBINE SECTION
• Exhaust gas from gas turbine is
used to produce steam.
• Evaporation capacity : 126 t/hr
• Steam Pressure: 39 bar
• Steam Temp. : 490°C
• Turbine speed : 3000 rpm
• Flue Gas Temp.: 1010°C
COMBINE CYCLE POWER PLANT
9. SUBSTATION
BUSBAR OUTGOING FEEDER
At APSCL Double bus-bar
arrangement in used
Outgoing Bus
132 KV Bus
230 KV Bus
A 6.6 KV incoming Bus is also
present in APSCL
132 KV
Shajibazar-3
Shajibazar-1
Shajibazar-2
Ghorashal-1
Ghorashal-2
Kishoregonj-1
Kishoregonj-2
230 KV
United 50MW Rental
AGRECO 80MW Rental
Comilla-I
Comilla-II
Ghorashal-1
Ghorashal-2
10. SUBSTATION
TRANSFORMER
In APSCL we have seen three types of transformer
Step up transformer Current Transformer Potential Transformer
• Used to increase the
voltage
• Secondary part is
connected to bus
bar
• Connected in
series
• Used for
measuring the
current in electric
equipment
• Used for measuring
The voltage in the circuit
connected in parallel
• Rated voltage – 132KV
& 230KV
11. In electrical
engineering,
an isolator is used to
make sure that an
electrical circuit can
be completely de-
energized for
service or
maintenance
A lightning arrester is a
device used on
electrical power system to
protect the
insulation system and other
equipment from the damaging
effect of lightning
ISOLATOR Lightning Arrester Circuit Breaker
Oil CB
Substation
13. Unit 2 ,3,4 & 5
Eastern bank of the Meghna river,
Ashuganj, Bhairab,B.Baria
17-12-1986(unit-2)
04-05-1987(unit-3)
21-03-1988(unit-4,5)
Brown Brovary & GEC England.
Thermal Power Plant
Location
Commissioning
Manufacturer
Plant Type
14. Unit 2 ,3,4 & 5
Fuel Type
Natural Gas
Bakhrabad gas
Co.Ltd
Turbine Type
Steam Turbine
River
water(Meghna)
18. Unit 2 ,3,4 & 5
Economizer
Exhaust flue gas is used to heat the feed water upto Up to 5.5°C to 6°C.
Reheater
Heat exhaust steam of HP tubine up to 335°C to 522°C
Exhaust gas goes inside the intermediate turbine.
Condenser
Condense the steam at the exhaust of the turbine
Convert this exhaust steam as hot water
19. Unit 2 ,3,4 & 5
BOILER
Burner
Natural gas is burnt with air for making heated steam
Total 9 furnaces.
Temperature (1200°C -1500°C).
Superheater
saturated steam is converted into a superheated steam.
523°C and pressure is about 135 bar.
20. Unit 2 ,3,4 & 5
TURBINE
HP Turbine (135 bar & 520⁰c)
IP Turbine (35 bar & 520⁰c)
LP Turbine( 90.0⁰c)
21. Unit 2 ,3,4 & 5
GENERATOR
AC Generator
Generates AC voltage by Faraday’s law of electromagnetic induction
Rotor rotates at rated rpm(3000)
When the rotor rotates, a voltage is induced in the stator coil.
DC Generator
To supply dc excitation voltage to magnetic field .
It gives constant magnetic flux
24. Controlling system
Unit 2
Analog control system . They are operated manually.
Unit 3 and 4
Digitalized system. Uses digital meter for measuring any data.
Totally digitalized and controlled by computer. Software provided by ABB Ltd.
Unit 2 ,3,4 & 5
Unit 5
25. Cooling system
Air cooling
At APSCL air cooling is used in unit 3, 4 and 5.
Water cooling
The stator winding of the generator is cooled by demineralized water.
Hydrogen cooling
Unit 2 uses this system
Unit 2 ,3,4 & 5
27. INTRODUCTION
1. KODDA 150MW power plant is a duel fuel power plant .
2. Operates in both high furnace oil(HFO) and Gas.
3. Uses diesel oil (LFO) to avoid any loss
4. Has a 132kv substation
5. Fire fighting section
6. 9 diesel engine producing 17.4MW power each
28. Oil Unloading By Road Or Overseas Ship
Oil Storage
HFO LFO
Oil Buffer Tank Day Tank
31. Booster unit
1. there are pipe lines for hfo and lfo oil.
2. At starting LFO oil passes in the booster unit and engine’s moving
part .
3. In seconds HFO injected in engine.
4. Before stopping engine again LFO is injected
32. Mechanical function
1. Lube oil is passed to risen up the efficiency of turbocharger
2. Then air is suctioned and compressed at high,which produces
rapid heat
3. Then injected fuel and heat causes huge explosion
4. This creates huge mechanical pressure and thus the crank shaft
rotates
5. Which makes the rotor to rotate as it is coupled with cylnder’s
crank shaft.
33. Alternator configuration
1. Dc supply is given to a bar twisted with wire and it creates a
magnetic field acted as rotor.
2. Power or voltage is produced stator
3. Because of low production of residual magnetism PMG is used.
4. Ac power is obtained from PMG and sent to AVR.
5. AVR is programmed as only to produce 11kv of dc power
34. Alternator configuration
AVR is coupled with a three phase circuit which acts like AC .
To tranform ac to dc rectifier circuit is used and it is the rotor
from where dc power is obtained.
Rotor is a magnetic field which cuts the winding thus cuts the flux
and produces voltage
From PMG avr gets the ac power supply and sends to excitation
field and by plc it controls the voltage production
35. Substation
• This power plant has 4 transformers , among them 3 are always
active and 1 is standby.
• Each transformer has primary winding is 11kv and secondary winding
is 132kv ,which is given to national grid.
• National grid sends to joydebpur and kabripur.
• Its has many CT ,PT , neutral grounding resistance (NGR)
37. History and Management:
• Founded in 1922.
• Oldest Dockyard in the Indian Subcontinent.
• Under the Ministry Of Defense.
• It was handed over to Bangladesh Navy in 2007
38. Works Done:
• Building and Repairing Ships according to the Requirement of the
customers.
Different Parts:
• Ship building Shop
• Machine Shop
• Maintenance Shop
• ICE shop
• Foundry Shop
• Electric Shop
39. • Winding Section:
Repairs winding of motors
• Battery Section
Charges all the batteries of the dockyard
• Radio Section
Repairs Electronics Parts
Electric Shop:
40. Power Supply:
• 2 Substations (2X 250 KW)
• 2 Diesel Generator(380 KW & 250
KW)
• Transformers 500 KVA rating Oil
Type
• LT, HT switchgear
41. Load Bank:
• Resistive and Inductive loads are used
• Fullde software is used to control
Used For
• testing of diesel generator
• To reduce wet stacking problems
42. DESCO
• Dhaka Electric Supply Company
Limited
• Distributes Electricity at the
Northern parts of Dhaka and
Tongi,Gazipur
• Estublished in 1996
43. Power Supply:
• PDB generates Power and sells it to PGCB
• DESCO Buys Electricity from PGCB
• DESCO takes electricity from Aminbazar Transmission line(132 KV)
• Receives 33KV In primary
• DESCO has 26 33/11KV transformers to convert it to 11KV
• It again steps down from 11kv to 415V at consumer end
44. Customer End:
• 2-7 KW, Single phase supply
• 8-50 KW, 3 Phase supply
• >50 KW ,gives connection from HT side
45. Transformer Repairing Section:
• Checks the moisture in oil
• If the insulation property is not good enough
• New oil is given or the old oil is reformed
• The windings are repaired here.
46. METERING and EQUIPMENTS
• DESCO first introduced GIS system in BD
• Now working on underground substations.
• Upgrading into Digital meters from
electromagnetic meters.
47.
48. • Energypac established in 1982
• Energypac is now deemed as a top power engineering
business dome
• Energypac has extensive distribution network throughout
Bangladesh with full-fledged offices in the major cities like
Chittagong, Khulna, Rajshahi, Sylhet, and Bogura
• Energypac has established its offices in India,Nepal,Italy
and China. Energypac has already experienced its products
and service supply to India,Nepal, Yemen, Ghana, Uganda,
Nigeria, Saudi Arabia,Vietnam,Korea,Philippines and United
Kingdom.
49. Products generated by Energypac power
Limited
• Current and Voltage Transformer (both inside and outside)
• Power and Distribution Transformer
• Various types of circuit Breaker
• Isolator and switchgear
in a words, all types of equipment which are needed to install a sub-
station……
52. Instrumentation transformer (CT & PT)
There are some basic difference between CT and PT…..
For CT toroidal coil is used , on the other hand in PT Rectangular coil used.
The secondary side of CT is always short circuited but secondary side of PT
is open circuited.
If any fault occurs in Tx lines, then current goes high in CT but in PT the
voltage droppes
53. Instrumentation transformer
There are two types of application for CT and PT…..
Metering application
Designed to work more accurately within range of CT
Less core material is used
Protection application
• More core material is used
• Relays are required to perform in fault current type
situations
54. (CT & PT)
There are some tests after manufacturing CT
and PT
Excitation &
Magnetization
Test
Burden Test
Primary
injection test
Turn ratio test
ALF & polarity
test
56. Power and Distribution transformer
Core cutting &
channel setting
Core
assembling
Coil winding &
insulator
Core coil
assembly
Vaccum drying
plant
Tap changing
transformer
conservator
Painting
Test
57. Cast Resent Transformer
• Energypac is the sole producer of cast resent
transformers in Bangladesh and offers a broad selection
of transformers up to 36kV and 4000kVA built to IEC
and ANSI standards
58. Cast Resent Transformer
• Generation of CRT::
Magnetic core-
High quality Cold Rolled Grain Oriented (CRGO) laminated Silicon Steel is used
High voltage winding
completely encapsulated in a cast resin body with a smooth surface
Low voltage winding
made from high quality Aluminum or copper foil
Cross flow fans
Permitting a 50 % increase in the rated power.
59. Cast Resent Transformer
Advantages of CRT::
• Self-extinguishing
• High thermal inertia
• Compactness
• Easy installation
• Reduced maintenance
• Good resistance to short circuited
60. Switchgear and control panel
. Low Voltage
Switchgear
Low and Medium Voltage
Motor Control Centres
Medium Voltage
and High
Voltage Control,
Protection and
Metering Panels
62. Vaccum circuit Breaker
• One of the most effective ways of interrupting an arc
circuit is to do so by means of contacts in vacuum
(the vacuum interrupter)
63. Vaccum circuit Breaker
Application of VCB::
• Power station
• Transformer
• industry
• Airport power supply
• Cold storage power supply
• Building power supply
64. Vaccum circuit Breaker
Energypack design VCB for ……
• Short circuit current
• overhead lines under load and no load conditions
• Ripple control system
• Capacitor banks
• Transformers and generators under load and no-load
condition
65. Switches and isolators
• Isolator may be called the mechanical parts which isolates a part of
transmission system from other side, which works in off load
66. Switches and isolators
• Switches is one kind of isolator which works in on load. It’s the
difference between switches and isolator
Isolator
Double
break type
Center
break type
pentograph
gravel filters remove bacteria and other small particles from water using simple and exessible technology.
Flow energy to mechanical energy
Rotor of the alternator is given dc supply so constant magnetic poles are formed.These constant magnetic poles produce constant flux.The rotor of the alternator is rotated by using prime mover,so constant poles are rotated,so these rotating magnetic poles produce rotating magnetic field.When this rotating magnetic field cuts three phase stator conductors produces three phase supply.
Hydrogen is seven to ten times better at transferring heat than air.
