Thursday, December 13, 2007

TDAVR

Introduction
The Thyristor Divert Automatic Voltage Regulator (TDAVR)
is a solid sate, Panel Mounting unit to control the excitation of an exciter that it turn provides the field current of an AC Generator. The exciter may be for a brushless or in special cases, a conventional generator

The AVR controls the output of a single-phase rectifier supplied from a high impedance compounding circuit. The Compounding circuit provides more output than is required by the exciter under all conditions and the excess current is diverted from the field windings through a thyristor, the gate of which is controlled by the action of a sensing circuit monitoring the line voltage and current

The Compounding circuit consists of a choke that has high impedance relative to the exciter field resistance, and one or two current transformers. The advantage of including the current transformers is that they enable the excitation to be sustained when the generator is subjected to a short circuit. The compounding circuit additionally constitutes a suitable source of supply for hand control that also gives a measure of automatic compensation for load changes.

Principle of Operation
> The Compounding Circuit
> The thyristorCircuit
> The Control Circuit
> The Stabilising Circuit
> The Frequency Cut-Off Circuit
> The Complete System

Specifications
Power Handling:
500-1000 or 1000-2000 watts continuous field power depending on the type of thyristor fitted
Exciter field voltage:
100 Volts maximum continuous
Ambient temperature range:
Operating: -20 0C to +65 0C
Storage: -40 0C to +100 0C

No comments: