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Automatic Voltage regulation technology
Introduction
Excitation system
Automatic voltage regulator
1.Excitation system
What is excitation system ?
Perpose of excitation system.
Type of excitation system
Conventional DC system.
Brushless excitation system.
AC excitation system with noncontrolled diode rectifier.
Alternative excitation system with stationary controlled thyristos rectifier.
Voltage source controlled exciter.
Compound source controlled exciter.
1.Conventional DC system
2.Brushless excitation system
3.AC excitation system with noncontrolled diode rectifier
4.Alternative exciter with stationary controlled thyristor rectifier
2.Automatic voltage regulation
Principle
Basic mode of operation
Manual control system
Auto control system
Basic operation of AVR
Problem due to voltage  sags in AVR
Type of AVR
Tap changing transformer
Saturable reactor regulators
Motorized variac
Cvt’s/ferroresonant transformers
Electronic voltage regulator
Phase controlled regulators
1.Tap changing transformer
2.Saturable reactor regulators
3.Motorized variac
4.Cvt’s/ferroresonant transformer
5.Electronic voltage regulators