what is an avr

An AVR, or Automatic Voltage Regulator, is an electronic device used in generators to maintain a constant voltage level to electrical equipment on the same load. It regulates voltage variations to deliver constant, reliable power supply, and without an AVR, voltage can sag, spike, or surge and damage electrical devices. The AVR is part of the alternators excitation system and is designed to facilitate the automatic maintenance of generator output terminal voltage at a preset value, especially when there is a change in the generator load or the operating temperature of the generator undergoes a shift. The AVR continuously takes input variable voltage ranges and maintains a constant output at a fixed voltage, which helps mitigate and even eliminate the damage that any fluctuations can cause to appliances, machinery, devices, and equipment. The primary functions of an AVR are to automatically control generator voltage and keep the output constant at the appropriate voltage level range for the generator regardless of the current being drawn by the load.