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REPORT ON

DAMODAR VALLEY CORPORATION

AT C.T.P.S

1

Dvc at c.t.p.s was started in 1964 as the only power plant with three bus bar.it consists of six units(presentely only three are in working).

The plant is situated on the banks of the damodarriver which is about 3kms away from hindustansteels dugda washery.

Total Installed capacity of ctps is 780MW.

Three working units are each of 140MW rating and the other are of 120MW.

Mission:-Flood control and irrigation.

Generation,transmission and distribution.

Eco-conservation and a forestation.

Water supply for industrial and domestic use.

Vision:-To establish DVC as a mega pithead power producer and

distributor in eastern region.

Coal and ash handling plant

Boiler

Super heater

Economize

Airpreheater

Steam Turbine

Condenser

Cooling tower

Feed water heater

Alternator

Exciter

Electro static precipatorElectro static precipator

Exciter

Alternator

Feed water heater

Cooling tower

Condenser

Steam Turbine

Airpreheater

Economize

Super heater

Boiler

Coal and ash handling plant

No.of the units

Installedcapacity

De rated Capacity

Unit No.1 140 MW 130 MW

Unit No.2 140 MW 130 MW

Unit No.3 140 MW 130 MW

Unit No.4 120 MW 120 MW

Unit No.5 120 MW 120 MW

Unit No.6 120 MW 120 MW

TOTAL 780 MW 750 MW

Capacity(MW) rated

First synchronising dates

Make of Boiler

Make of turboGenerator

140 10-10-1964 Combustion engg,USA

GE,USA

140 01-05-1965 Combustionengg,USA

GE,USA

140 10-07-1968 Combustion engg,USA

GE,USA

120 02-03-1974 ACCBackcock Ltd ,India

BHEL, India

120 28-03-1975 ACC backcockLtd,India

BHEL, India

120 29-03-1979 ACC backcockLtd,India

BHEL,India

GENERATOR NOS. 1,2 and 3;

Rating : 165000 KVA Power factor : 0.85

Excitation : 375 Volts Frequency : 50 Hz

ATP : 2 poles Gas pressure : 30 PSI

Seal oil pressure : 2.3 kg/cm2 Diff.pressure : 0.35 kg/cm2

Starter Amp : 6351 Field Amp : 1220

Short circuit ratio : 0.7 Coolant :hydrogen

Connection : (Y) for 15000 and165 KVA Maker :general electric co. (U.S.A)

GENERATOR NOS.4,5 and 6;

Rating : 141176 KVA Power factor : 0.85

Excitation : 433 Volts,1730amps Frequency : 50 Hz

Revolution : 3000 RPM Gas pressure : 2.1 kg/cm2

Startor rating : 138 kv Stator amps : 5906

Connection : (Y) for138000volts and 141176 KVA Phase : 3

Coolant :hydrogen Maker :BHEL,(BHOPAL),INDIA

TURBINE NOS. 1,2 and 3 :

Rating : 140000 Kw RPM : 3000

Steam condition pressure : 1800 Stage : 26

PSIG Temperature : 1000 degree F Rheat temperature : 1000 degree F

Exhaust pressure : 25 degree Hg

ABS

Phase : 3

Frequency : 50 Hz Power factor : 0.85

Turbine No. : 170*124 Maker :general electric co. (U.S.A)

TURBINE NOS. 4 ,5 and 6 :

Rating : 120000 Kw Power factor : 0.85

KVA :141176 Excitation : 433 volts and 1730amps

Stator :138000 volts and 5906 amps Connection and RPM : Y and 3000

Phase : 3 Frequency : 50 Hz

Type : Turbo Coolant :hydrogen

Gas pressure :2.1 kg/cm3 Maker :BHEL,(BHOPAL),INDIA

1

1.COAL HANDLING PLANT Coal is required in the power house to generate heat so that steam can be generated in the power house . to generate from row coal boulders into powered form coal handling

plant is required.ROUTE

1.By road 2.Rail

•Size of coal is 20mm

1

Crusher house

Coal bunker Coal mill

Coal handling plant

Wagon tippler and weigh bridge

Coal (thru rake)

furnance

BOILER AUXILIARY

TURBINE AUXILIARY

GENERATORAUXILIARY

F.D FANS DEAERATOR SEAL OIL SYSTEM

I.D FANS HOTWELL HYDROGEN COOLING SYSTEM

BOILER DRUM BOILER FEED PUMP GENERATOR TRANSFORMER

COAL MILLS CONDENSATE PUMP

COAL FEEDERS LOW PRESSURE AND HIGH PRESSURE HEATER

switching equipment used in the transmission of electricity.

Apart from main bus bar two duplicate buses are provided in the switchyard . They are used when there is some fault in the mai bus bar or some maintenace work is to be done in the main bus bar.

The three bus used in DVC are:

1. 33kv

2. 132kv

3. 220kv

All the generating eguiptments- transformer,generator etc. are connected to the main bus bar under normal conditions

But when fault occurs the supply is transferred to the transfer bus with the help of isolators.

Two bus are connected to each other by the bus coupler.

Jumpers are provided in the switch yard to move the wires either up or down in the yard.

DVC suplies bulk power at 33kv,132kv,220kv through a network covering

more than 5500 circuit kilometers.

The dvc grid is interconnected with the state electricity boardof jharkhand

(JSEB),west bengal(WBSEB) and grid corporation of orissa and power grid

corporation of India Ltd.

Existing Links(Ckt kms)

Existing Sub-stations(Nos.)

state 33kv 132kv 220kv

Jharkhand 690 2175 898

West Bengal 380 1240 560

Orissa 42

TOTAL 1070 3415 1500

State 33kv 132kv 220kv

Jharkhand 9 21 7

West Bengal 7 12 4

TOTAL 16 33 11

Circuit Breakers1. SF6 type circuit breaker (132)

2. Minimum oil circuit breaker(132)

3. Vaccum circuit breaker(33kv)

Lightning arresters

Fuse

Load interrupter

Line isolator

relays

•Circuit Breakers1. SF6 type circuit breaker (132)2. Minimum oil circuit breaker(132)3. Vaccum circuit breaker(33kv)

Lightning arrestersFuse Load interrupterLine isolator relays

.

INTERLOCKING SYSTEM

Interlocking system is such type of system by which the machine is shut down automatically for

preventing any loss when the process is not running properly or under any abnormal condition .inter lock

is used inmany system present in the power house .

The interlocking system is mainly used in three portion of the plant ;

1.Boiler feed pump

2.Generator seal oil pump interlock

3.Turbine bearing oil pump

coal storage

Coal handling

Plant

Boiler

AshStorage

AshHandli

ng plant

Economiser

Super heater

Air pre-heater

turb

ine exciter

condenser

Collingtower

+

Alternator

Induced draught fan chimney

Force draught fan

Water treatment chamber

Feed water pump

Feed water heater

Flue gases

Flue gases

Transformer

Exhaust steam

Valve

Circulating water pump

Hot air

Flue gases

Bus Bar

C.B

R YB

.

TRANSFORMERS IN POWER SYSTEM

1.Generating Transformer(GT)It is transformer on which generating terminal voltage is given. It is a set-up

transformer responsible for stepping up the generated voltage to the required voltage in the switchyard which may be either 132kv or 220 k v .after stepping up the voltage the power is given to the main bus bar which runs horizontally in centre throughout a switchyard now from this main bus the electricity is

now ready to distributed to different sub station or direct consumer.

2.Unit Auxiliary Transformer (UAT)UAT is a step down transformer which is connected to G.T so it step down the voltage from 132 or 22okv to the required voltage near about 3.5kv.It is used for

providing the require power for the auxiliary unit like coal handling plant , coal mil, boiler feedback pump e tc. generally two UAT are connected to on

G.T

1

3.Reserve transformer In power house there is probability that the G.T can develop some fault or has to be

closed for maintenance in that case the auxiliary unit supply is to be pulled off which is connected to G.T .this will interrupt in the working of the plant .R.T are present in

the power house to supply power to auxiliary unit .R.T has two teminals;1.Common auxiliary board (CAB)2.Startup emergency board (SEB)

( responsible for providing the power )Apart from these three transformer there are two other types of transformer ;

Potential transformerCurrent transformer