Lets us know about AVR - Automatic Voltage Regulator

AVR- automatic voltage regulator, regulates the voltage of a generator. When voltage drops, due to load increase, AVR gives voltage to exciter and exciter more excites the alternator and voltage improve.

The AVR senses the voltage in the main generator winding and controls the power fed to the exciter stator and hence the main rotor to maintain the generator output voltage within the specified limits, compensating for load, speed, temperature and power factor of the generator.

A frequency measuring circuit continually monitors the shaft speed of the generator and provides under-speed protection of the excitation system by reducing the generator output voltage proportionally with speed below a pre-settable threshold. A further enhancement of this feature is an adjustable VOLT per Hertz slope to improve engine recovery time on turbo charged engines. Soft start circuitry is included to provide a smooth controlled buildup of generator output voltage.

Uncontrolled excitation is limited to a safe period by internal shutdown of the AVR output device. This condition remains latched until the generator has stopped. Provision is made for the connection of a remote voltage trimmer, allowing theuser fine control of the generator’s output. The AVR has the facility for droop CT connection, to allow parallel running with other similarly equipped generators.

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