The AC Automatic Voltage Regulator

The automatic voltage regulator (AVR) is a device designed to regulate voltage automatically – that is, to take a fluctuating voltage level and turn it into a constant voltage level. There are many types of automatic voltage regulators.

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Automatic voltage regulators not only vary in size and design, but also in name and description. Common names for AVRs include:
  • Auto-boost regulator
  • Constant voltage regulator
  • Constant voltage transformer
  • CVT
  • Double conversion electronic voltage regulator
  • Electromechanical voltage regulator
  • Electromechanical voltage stabilizer
  • Electronic tap-switching voltage regulator
  • Electronic voltage regulator
  • EVR
  • Ferro
  • Ferroresonant transformer
  • Ferroresonant voltage regulator
  • LDC
  • Line voltage regulator
  • Line drop compensator
  • Magnetic induction voltage regulator
  • Magnetic induction voltage stabilizer
  • Mechanical tap-changing regulator
  • Motor-driven variable autotransformer
  • Motorized variac
  • Motorized variable transformer
  • OLTC
  • On load tap changer
  • Servo voltage regulator
  • Servo voltage stabilizer
  • Step voltage regulator
  • Tap changer
  • Tap-switching voltage regulator
  • Variable autotransformer
In the sections describing the different types of voltage regulators, common names for each type will be identified and used interchangeably along with generic names, such as AVR and automatic voltage regulator. Please note that the descriptions, operational explanations and other commentary provided about the different types of AVRs is for informational purposes only and is intended to provide an overview of variations among a class of products generically called “automatic voltage regulators.”