A Presentation onTurbo Generator & Exciter

DEPTT. OF ELECTRICAL AND

ELECTRONIC ENGG.CENTURION UNIVERSITY

SUBMITTED BY:- SUNIL KUMAR 120301EEL073 EEE,A2

Introduction Turbo generator converts mechanical energy into electrical energy.

The Mechanical motion is generated in turbine by using heat in the form of saturated steam.

It operates on the fundamental principles of ELECTROMAGNETIC INDUCTION.

Operation principle:

A EMF is induced in a conductor when it is cut by the magnetic flux is known as electromagnetic induction. E= N dφ/dt

TYPES OF GENERATOR

AC Generator

DC Generator

Induction Generator

SYNCHRONOUS GENERATOR

Self Excited DC Generator

Separately Excited

TURBO GENERATOR Synchronous Generator

Definition:The generator which runs in a synchronous speed

corresponding to the no of pole and supply frequency

Parts:By Mechanical

StatorRotor

By electrical:Armature winding

The winding which carries only the load current.

Field windingThe winding which carries only the field current required

to produce the magnetic flux.

TURBO GENERATOR

Advantages of Armature as a stator

More efficientEasy coolingEasy insulationTaping of voltage is very easyLess weight of rotor so less inertia.

TURBO GENERATOR

Typical Arrangement of Turbo Generator

TURBO GENERATOR

PMG

EXCITER ROTOR

EXCITER STATOR

RECTIFER

ASSEMBLY

COOLING FAN

BEARING

SHAFT

MAIN STATOR

As the generated voltage formula is

E = 4.44 f φm N K

It means Generated voltage depends upon following things

SpeedFlux densityNo of turnsWinding factors

TURBO GENERATOR EXCITATION SYSTEM

Excitation System• The process of generating a magnetic

field by means of an electric current is called excitation.

• It provides power to the field windings thus produce field for rotor.

Types of exciter:Brush type exciter / Static excitationBrush less exciter

Brush Type/Static ExcitationRotor Field Winding is connected to Slip ring

mounted on Rotor. Excitation is provided by current transfer by

contact through Carbon Brushes, Slip ring and field lead.

Brushless Excitation system

PMG PMG cooling

fanMain Exciter

armature Rectifier wheel

Advantage Of Brush Less Exciter Over Brush Type Exciter

Eliminates Slip Rings, Brush gear and Field Breaker

Eliminates all problems associated with transfer of current via sliding contacts

Eliminates the Hazard of changing Brushes on Load

Brush Losses are eliminated

Typical Arrangement of Excitation system

TURBO GENERATOR EXCITATION SYSTEM

GENERATOR AVR (AUTOMATIC VOLTAGE REGULATOR) SYSTEM

14

1.Exciter 2. Regulator3. Measuring Unit4. Power system stabilizer 5. Limiters and protective circuits

AVR BASIC ARRANGEMENT BLOCK DIAGRAM

GENERATOR AVR (AUTOMATIC VOLTAGE REGULATOR) SYSTEM

Main functions of AVR

1. Terminal voltage control

2. Reactive power control

3. Power system stabilizer

4. Limiters

15

PMG

AVR

3000 RPM IMPULSE REACTION

ROTOR FIELD 355V, 4.21 KA STATOR O/P 21 KV, 16.98 KA

SPEED> 90 %

2000A SF6 CT RATIO

2000/1

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