The Automatic Voltage Regulator (AVR) is one of the most important parts of the warning system in the generator. The voltage regulator adjusts the output of the exciter and ensures that the changes in the generated voltage and reactive power remain within the desired limits. In case of voltage increase or decrease caused by sudden load changes on alternator outputs, they can intervene in milliseconds and thus make the system stable.

AVR helps to keep the alternator outputs stable all the time.