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Automatic Voltage

regulation technology

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Introduction

Excitation system

Automatic voltage regulator

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1.Excitation system

What is excitation system ?

Perpose of excitation system.

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Type of excitation system

Conventional DC system. Brushless excitation system.

AC excitation system withnoncontrolled diode rectifier.

Alternative excitation system with

stationary controlled thyristosrectifier.

Voltage source controlled exciter.

Compound source controlled exciter.

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1.Conventional DC system

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2.Brushless excitation system

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3.AC excitation system with

noncontrolled diode rectifier

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4.Alternative exciter with stationary

controlled thyristor rectifier

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2.Automatic voltage regulation

Principle

Basic mode of operation

Manual control system Auto control system

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Basic operation of AVR

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Problem due to voltage

sags in AVR

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Type of AVR

Tap changing transformer

Saturable reactor regulators

Motorized variac Cvts/ferroresonant transformers

Electronic voltage regulator

Phase controlled regulators

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1.Tap changing transformer

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2.Saturable reactor regulators

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3.Motorized variac

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4.Cvts/ferroresonant transformer

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5.Electronic voltage regulators