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REPORT ON DAMODAR VALLEY CORPORATION ELECTRICAL ENGINNERING (2014-2015) DR. B.C. ROY ENGG COLLEGE 1

DVC, BOKARO THERMAL PPT

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Page 1: DVC, BOKARO THERMAL PPT

REPORT ON

DAMODAR VALLEY

CORPORATION

ELECTRICAL ENGINNERING

(2014-2015)

DR. B.C. ROY ENGG COLLEGE

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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

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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.

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MISSION AND VISION

GENERATION,TRANSMISSION AND DISTRIBUTION OF

POWER.

PREVENT DISASTER

INDUSTRIAL AND DOMESTIC USE

ECO-CONSERVATION

ENRICHING THE QUALITY OF LIVES OF PEOPLE

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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)

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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

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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

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FAULTS IN STATOR AND ROTOR

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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.

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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.

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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

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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.

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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

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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.

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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

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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

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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

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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.

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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