INDUSTRIAL TRAININGAT

ABHITENDRA SINGH

B.TECH IV YEAR

SECTION - F

ABOUT

NTPC Limited is the largest power generating company of India.

A public sector company, it was incorporated in the year 1975 to accelerate power development in the country as a wholly owned company of the Government of India.

It has an electric power generating capacity of 41,184 MW.

It is one of the seven Maharatna companies.

ABOUT

It has15 coal based (24,395 MW).7 gas based (3,955 MW).4 Joint Venture Projects (2,294 MW). NTPC's share on 31 Mar 2008 in the total installed capacity of the country was 19.1% and it contributed 28.50% of the total power generation of the country during 2008-09.

AURAIYA GAS POWER PLANT

NTPC Auraiya is located at Dibiyapur in Auraiya district in the state of Uttar Pradesh.

AURAIYA GAS POWER PLANT

BRIEF DISCRIPTION

•Type of station : Gas based combined cycle•Established : 1989• Location : Dibiyapur in Auraiya district of UP•Fuel : Natural Gas, Naphtha• Fuel source : HBJ Pipeline - South Basin Gas field• Water source : Auraiya – Etawah Canal• Gas Turbine Output : 4X110 MW• Steam Turbine Output : 2X106 MW• Net plant Output : 652 MW• Water Consumption : 3.2 cusecs• Beneficiary States : Uttar Pradesh, Jammu & Kashmir, Himachal Pradesh, Chandigarh, Rajasthan, Haryana, Punjab , Delhi & Uttranchal.

AURAIYA GAS POWER PLANT

Major affecting conditions are ambient temperature, Barometric pressure and Power Factor at generator terminals.

AuGPP has two combined cycle gas module each consisting of two gas turbines, waste heat recovery boilers (WHRB) and one steam turbine.

The capacity of each Gas Turbine is 111.76 MW and that of Steam Turbine is 110 MW.

Total capacity of each Module: 326 MW.

AURAIYA GAS POWER PLANT

The AuGPP can be basically divided into two sub-plants:A

uG

PP Switchy

ardMain Plant

MAIN PLANT

The Main Plant consists mainly of the following componenets:1.Gas Turbines2.Steam Turbines3.Waste Heat Recovery Boiler4.Generators

Mod

ule-

1M

odul

e-2

220

KV

SW

ITC

HY

AR

D

FR

OM

K

AN

PU

R

TO

A

GR

A

(PG

CIL

)

GAS TURBINEGas Turbine is a heat engine.

In the Gas Turbine, the following processes take place:Compression

of working medium (air) taken from atmosphere in a compressor.

Combustion Increase of working medium

temperature by constant pressure ignition of fuel in combustion chamber.

Expansion of the product of

combustion in a turbine.

APPLICATIONS OF GAS TURBINE

Conventional applications are Simple cycle operation.  Combined cycle operation.

Electric utility companies use gas turbine predominantly in simple cycle and combined cycle applications.

Combined cycle operation is much efficient than open cycle operation.

STEAM TURBINEThere are 2 steam turbines in number, present in the full AuGPP

The two waste heat recovery boilers combined their output to one turbine.

The turbine gets its feed from the low pressure (LP) and high pressure (HP) drums.

The low pressure drums give its output directly to the turbine but the HP drums give its output to the supper heater and then to the turbine.

In this way, steam turbine consists of two turbines – Low Pressure(LP) and High Pressure(HP) turbines.

The steam turbine operates on Rankine cycle.

GAS TURBINES VS. STEAM TURBINES

GENERATORGenerator is three phases, two pole air cooled machine.

The mechanical energy generated by turbine is converted to electrical energy by the generator and appear in the stator winding in the form of current and voltage. This balances the torque of the gas turbine.

It lead the magnetic flux, and carries the field winding, the generator is self excited. The power required for the excitation is taken from the generator terminals and fed to the field winding through the excitation transformer and the thyristor- controlled rectifier units.

WASTE HEAT RECOVERY BOILER

AuGPP is also known as Waste Heat Recovery Boilers (WHRB) plant, which is of non-fired, dual pressure and forced circulation type. The boiler has two different water/steam cycle known as high-pressure system and low-pressure system.

Components of WHRB The main components of the WHRB can be divided into following categories:

LP EconomizerLP Drum & EvaporatorLP Super-heaterHP EconomizerHP Drum & Evaporator

SWITCHYARD It is a medium for exchange of power from source to load or from one source to another.

It consists of switching equipment, measurement, protection and control equipment required for power generation and utilization.

Some of the main components of Switchyard are:• Circuit Breaker(CB)• Isolator• Current Transformer(CT)• Capacitive Voltage Transformer(CVT)• Lightning Arrester(LA)• Wave Trap• Earth Switch

SWITCHYARD

There are mainly two sub-systems for the transmission of electricity in the Switchyard:I. 400 kV SystemII.220 kV System

400 kV SYSTEM

Used for transmission with Agra and Kanpur.

Contains2 Main BusOne and a Half Breaker Scheme

15 Bays

400 kV BUS SCHEMES

One and half breaker scheme

Main Bus-2

Main Bus-1

220 kV SYSTEMUsed for transmission with Sikandara SS, UPPC Pata SS, Phaphund SS and Malanpur SS.

Contains2 Main Bus1 Transfer Bus24 Bays

220 KV BUS SCHEMES

6 Generators

2 Stn.transformers

Bus Coupler

Transfer Bay

8 Transmission lines

Transfer Bus

Main Bus-1

Main Bus-2

Double main and Transfer bus scheme

ADVANTAGES OF GAS BASED PLANTS

High Thermal EfficiencyLow Water RequirementsEnvironment FriendlyFast Start-UpLow Installation Cost

THANK YOU