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Transcript of Ppt turbo generator
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
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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
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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
THANK YOU