Electrical power system 1 G H Raisoni College of Engineering,Nagpur Guided by - Pankaj Ramtekkar In this presentation study of different types of excitation system for alternator tophics - excitation system functions of excitation types of excitation system

1. G.H.RAISONI COLLEGE
OF ENGINEERING
Electrical Department
Section Roll No : A- 52
BRANCH : ELECTICAL
Subject :- Electrical Power System - I
TOPIC : STUDY OF DIFFERENT TYPES OF
EXCITATION
SYSTEM FOR ALTERNATOR
PRESENTED BY: Kamlesh Chopade (A-52)

2. Introduction
ALTERNATOR
It Is An Electrical Machine Which
Converts Mechanical Power Into
Electrical Power By The Principle Of
Electro-magnetic Induction.
Alternators Are The Primary Source
Of All The Electrical Energy We
Consume And Also The Largest
Energy Converters.

3. EXCITATION SYESTEM
The Process Of Creating And Strengthening the Magnetic
Field Of The Alternator By Providing The Necessary Direct
Current To The Field Winding Of The Alternator.
THE DIRECT CURRENT IS SUPPLIED TO THE ROTORBY A
SEPARATE D.C. SOURCE, CALLED EXCITER.
FUNCTION OF EXCITATION
• Supply Direct Current To the Field Winding For Creating
Magnetic Field.
• Control Voltage & Reactive Power.
• Perform Protective Function.

4. TYPES OF EXCITATION SYSTEM
1. DC Excitation System
2. AC Excitation System
3. Static Excitation System
D.C. EXCITATION SYSTEM TWO SMALL D.C.GENERATORS
ARE USED AS EXCITERS.
It is the oldest of all. Due to various problem now a days it
is not conventionally used for large alternators

5. A.C. EXCITATION SYSTEM
It Consists Of A.C. Generator And Thyristor Rectifier
Bridge Directly Connected To The Alternator Shaft or
driven by separate motor.
IT IS OF TWO TYPES
1. BRUSHLESS EXCITATION SYSTEM
Main exciter is separately excited
2. ROTATING THYRISTOR EXCITATION SYSTEM
Main exciter is self excited

6. 1.BRUSHLESS EXCITATION SYSTEM
• Elimination of brush & slip rings
• Less maintenance
• Fast response time
Suitable For Higher Rating Alternator

7. 2. ROTATING THYRISTOR EXCITATION SYSTEM

8. Thank you!