Industrialtraningreportat

Turbo Generator

Overview - B.H.E.L

BHEL is the largest engineering &manufacturing enterprise in India.

Established 40 years ago.

Earns profits continuously since 1971-72,& paying dividends since 1976-77

Vision, Mission & Values

Vision

HEEP(Heavy Electrical Equipment [Plant)

Heep(Heavy Electrical Equipment Plant)Block 1 : Electrical Machine Shop

Block 2 : Heavy Fabrication Shop

Block 3 : Turbine Manufacturing

Block 4 : CIM( Coils & Insulation Manufacturing )

Block 5 : Condenser fabrication &Forgr

Block 6 : FabricationShop,DieShop, Stamping

Shop

Block 7 :CarpantryShop

Block 8 : Heat Exchanger shop

Block 1Machine section

Assembly section Hydro generator

Stator winding

Machine section

Iron assembly

Heavy rotor assembly section

Stator winding section Turbo generator

Armature/Rotor section

General assembly section

Test stands

TURBO GENRATOR210 MW

Sailentfeature of TurboGenrator

Rated output : 588 MVA,500 MW

Terminal voltage : 21 KV

Rated stator current : 16 KA

Rated frequency : 50 Hz

Rated power factor : 0.85 Lag

Efficiency : 98.55%

TurboGenrator

Turbo generator consists of following parts:

o STATOR

o ROTOR

o BEARINGS

o SHAFT BEARINGS

Other additional auxiliaries:

o Excitation system

Stator

Stator frame

Stator core

Stator winding

End shields

Terminal bushing

Phase connector

Hydrozencooler

Statorframe

Stator body is a totally enclosed gas tight fabricated structure made up of high quality mild steel

At top of the stator frame U-shape pipe is situated which are used to flow of water for cooling .

Stator Core

The laminated core made by cold rolled high quality

silicon steel

It is stacked with lamination segments & Segments

are assembled in an interleaved manner from layer

to layer for uniform permeability.

Stator Winding

The stator has a three phase, double layer, short pitched and bar type of windings having two parallel paths

Each bar consist of hollow conductor with cooling water passing through the latter.

Bhelused to epoxy mica thermosetting insulation for stator bars.

VaccumPressureImpregration

In 1956 Dr. MEYER has brought this system.

In this process preheating,impregration,postcuring&

electrical testing are done.

It remove the penetrating air pockets in the winding.

Rotor

Rotor shaft

Rotor winding

Rotor wedges

Rotor retaining rings

Field connections

Fans

Rotor shaft

Rotor shaft is a single piece solid forging

manufactured from a vacuum casting.

Thelongnitudnalslots are distributed over

thecircumfrence

Rotor winding

The rotor winding distributed symmetrical in the rotor pole

The winding itself is made up of many turns of copper .

All of the turns associated with a single slot are called a coil.

RetaningRing

RetaningRing

The overhang portion of the field winding is held by non-magnetic steel forging of retaining against centrifugal forces.

They are shrink fitted to the ends of the rotor body at one end.

The other side of retaining ring does not make contact with the shaft .

To reduce stray losses, the retaining rings are made of non-magnetic, austenitic steel and cold worked, resulting in high mechanical strength.

Fans

The generator cooling gas is circulated by two single stage axial flow propeller type fans.

The fans are shrink fitted on either side of rotor body.

Fan hubs are made of alloy steel.

Fan blades which are precision castings with special alloy are machined in the tall portion.

Thank you!

For More

About

Electrical Engineering

visit

TechnofriendzA community of technical scholars

technofriendz.weebly.com