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REPORT ON
DAMODAR VALLEY
CORPORATION
ELECTRICAL ENGINNERING
(2014-2015)
DR. B.C. ROY ENGG COLLEGE
1
P R E S E N T E D B Y : -M D S O H A I L A K H T E R
2
INTRODUCTION:
DAMOADAR VALLEY CORPORATION:
FIRST MULTIPORPOSE RIVER VALLEY PROJECT.
ESTAIBLISHED IN 7TH JULY 1947,BEING ASIA’S FIRST
THERMAL POWER PLANT.
TO ARREST THE FURY BY THE RIVER OF SORROW AND
TO HARNESS THE RESOURCES OF DAMODAR VALLEY
COMMAND AREA.
A POWER GENERATING CAPACITY OF OVER 2710MW.
3
MISSION AND VISION
GENERATION,TRANSMISSION AND DISTRIBUTION OF
POWER.
PREVENT DISASTER
INDUSTRIAL AND DOMESTIC USE
ECO-CONSERVATION
ENRICHING THE QUALITY OF LIVES OF PEOPLE
4
DVC POWER STATION AT GLANCE:1)THERMAL
NAME LOCATION CAPACITY
BOKARO-B Dist-BokaroState-Jharkhand
630 MW(3*210 MW)
CHANDRAPURA Dist-BokaroState-Jharkhand
890 MW(3*130 +2*250 MW)
DURGAPUR Dist-BurdhamanState-West Bengal
350 MW(1*140 MW + 1* 210 MW)
MEJIA Dist-BankuraState-West Bengal
2340 MW(4*210 MW + 2*250 + 2*500)
5
2)HYDEL:
NAME LOCATION CAPACITY
TILAIYA River-BarakarDist-HazaribaghState-Jharkhand
4 MW(2*2 MW)
MAITHON River-BarakarDist-BurdhamanState-West bengal
60 MW(3*20 MW)
PANCHET River-DamodarDist-DhanbadState-Jharkhand
80 MW(2*40 MW)
TOTAL HYDEL 144 MW
TOTAL THERMAL 2710 MW
GRAND TOTAL 2854 MW
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BOKARO THERMAL POWER PLANT STATION
Equipments
River intake pump house
Reservoir pump house
Water treatment house
CW pump house
Boiler plant
Coal handling plant
Coal mill
Ash handling plant
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Turbine generator set
DM plant
Types of transformer-
Generator transformer
Unit auxiliary transformer
Reserve transformer
8
LAYOUT OF BOILER
Furnace-chamber in which cumbustion reaction isolated
Boiler drum-separate water from steam
Economizer-preheat boiler feed
Superheater- three stages of convection type
Reheater-reheat the steam
Burners-coal burners and oil burners
Igniters-twelve igniters per boiler
Coal bunker-coal is transported
Mills-pulverize coal to desired fineness
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P.A Fans-handling hot air
Air preheater-transfer heat from flue gases to air
F.D. Fans-handling secondary air
Wind box-supplying secondary air
Electrostatic precipitator-horizontal gas flow
I.D Fans-sucking flue gases from furnace
Chimney-tall RCC structures
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LAYOUT OF TURBINE-
HIGH PRESSURE TURBINE-
single flow
12 stages
size of blades increases from right to left
right blade known as CURTIS WHEEL
left blade known as MULTI LABYRINTH SEALING
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Intermediate pressure turbine
single flow 11 stages semi flexible coupling
Low pressure turbine
double flow 8 stages sealing is done to check air leakage
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ALTERNATOR
Ac motor is based on principle of electromagnetic induction. A motor is a machine which converts mechanical energy to electrical energy. It is robust,cheap,efficient and require little maintainance.
V=E+Ia*Ra
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PRINCIPLE
A current carrying conductor placed in a slot of armature, a force acted upon by the magnetic field from north pole of the motor from fleming’s left hand rule. The conductor has tendency to move to the left hand side, a tangential force acts on the motor, a torque is developed on the rotor, rotor is free to move so starts rotating in anticlockwise direction.
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PARTS OF ALTERNATOR
A) STATOR : Consists of following parts-
1)CORE: ferromagnetic material
2)COIL
3)YOKE
4)VENT: for cooling
5)TERMINAL BOX
6)AIR CIRCULATING FAN
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B) ROTOR : Consists of following parts:-
1)SLOTS
2)SHAFT
3)BEARING SECTION
4)FD FAN
5)COUPLING
16
FAULTS IN STATOR AND ROTOR
17
GENERATOR PROTECTION
INTERNAL PHASE FAULT : Protection is provided by
differential relay
Unbalance loading of stator winding : Protection is provided by
negative phase sequence relay
Backup protection : In case of fault persists in the system
and generator is feeding the fault, then backup
protection is feeding the fault.
18
Rotor earth protection : This method is adopted to detect
ground fault in rotor winding.
Loss of excitation : The relay provided to detect loss of
excitation is high speed of mho relay.
Overheating : It is detected by means of temperature
detector embedded between winding.
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Power generation
Water is taken from river and demineralised and then send to
boiler.
Super heated steam of 540 degree celsius is formed which
hits turbine with pressure of 137 kg/cm square.
It rotates turbine to which rotor of generator is coupled when
speed comes to 3000 rpm then building of voltage starts due
to faraday’s law of electromagnetic induction.
20
When voltage becomes 15.75kv then this is fed to
transformer to step it up to 220kv,which is bus bar
voltage.
Generator is synchronized with bus bar and steam is
condensed to water, reused again to generate power.
power generated :
KW=KVA*P.F
KW=247*0.85
KW=210 MW
21
SWITCH YARD
CIRCUIT BREAKER : Switching and current interrupting device.
Isolator : Operated under zero amperes current.
Earthing device : Discharges the charges on conductor to earth.
Lighting arrester : Discharges excessive voltage to earth.
Relay : Closes contact when actuating quantity reach a pre-determined value.
CURRENT AND POTENTIAL TRANSFORMER : Transforms current and voltage to lower value for the purpose of measurement, protection and control.
22
DIRECT CURRENT SYSTEM
IN CASE OF EMERGENCY DC SUPPLY IS
REQUIRED FOR SEAL OIL PUMP, LIGHTING
ARRESTER AND ALSO OTHER PROTECTIVE
RELAY. THESE REQUIREMENTS ARE MET BY
A COMPREHENSIVE DC SYSTEM. TO TAKE
CARE OF FAILURE OF NORMAL DC SUPPLY A
STORAGE BATTERY OF ADEQUATE CAPACITY
IS PROVIDED.
IT COMPRISES OF- Battery banks
Battery chargers
23
OPERATION DURING TOTAL POWER FAILURE
I. Switch off the breakers of all incoming & outgoing lines.
II. Keep control of battery charger at minimum position.
III. Contact with other stations & ask for power.
24
TRANSFORMERS
1) GENERATOR TRANSFORMERS
Rating: 250MVA
Voltage ratio: 15.75KV/220KV
Cooling: oil forced, air forced
2) UNIT AUXILIARY TRANSFORMERS
Rating: 16MVA
Voltage ratio: 15.75KV/6.6KV
Cooling: oil natural, air forced
25
3) DISTRIBUTION TRANSFORMERRating: 1250 KVAVoltage ratio: 6.6 KV/415VCooling: air natural
4) STATION SERVICE TRANSFORMERRating: 31.5MVAVoltage ratio: 220KV/6.6KVCooling: oil natural, air forced
5) AUTO TRANSFORMERRating: 150 MVAVoltage ratio: 220 KV/132 KV
26
COAL HANDLING
STEPS IN COAL HANDLING:
a. Coal delivery
b. Unloading
c. Preparation
d. Transfer
e. Storage
f. Implant handling
g. Crushing & pulverizing
h. Weighing & measuring
i. Feeding the coal into furnace
27
MANPOWER OF COAL HANDLING
I. Russian 400MW, Indian 440MW.
II. To know the calorific value.
III. To crush large size raw coal into small size.
IV. To remove impurities & provide good flame to boilers.
28
PROCEDURE
Loading coal in wagon machine.
Bringing it on railway track by wagon pusher:
A)boggy fixed in wagon machine
B)bucket is tilted till it lights up the bulb
C)bulb offs means bucket is tilted completely & coal is filled in bunker hopper
Carrying the coal with the help of conveyor from bunker hopper.
Crushing the coal through crusher.
Storing the bunker powder.
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THANK YOU