Automatic Voltage Regulator (AVR) for Generators An automatic voltage regulator (AVR) is a electronic device for automatically maintaining generator output terminal voltage at a set value under varying load and operating temperature. It controls output by sensing the voltage V out at a power-generating coil and comparing it to a stable reference. Basic of automatic voltage regulator - Electrical Basically the AVR or Automatic Voltage Regulators function for generator is to ensure voltage generated from power generator running smooth to maintain the stable voltage in specified limit. It can stabilize the voltage value when suddenly change of load for power supply demand. If the generator running in parallel condition,the AVR can controlled the voltage Automatic Voltage Regulator User’s Manual PDF fileEA63-5 is an automatic voltage regulator (AVR) for AMG synchronous generator industrial application series. The AVR is typically supplied by a single-phase auxiliary winding wound into the stator 3.2 CONNECTION DIAGRAM Figure 3: Connection diagram (Power input: Auxiliary winding).