What is an AVR (Automatic Voltage Regulator ) in Diesel Generator?

A Generator Automatic Voltage Regulator (AVR) is a device that controls and stabilizes the output voltage of a generator. It is an essential component in power generation systems as it ensures a steady and reliable power supply. The AVR monitors the generator's output voltage and makes adjustments to maintain a consistent voltage level, regardless of load variations or changes in input conditions.

The primary function of an AVR is to regulate the generator's voltage within a specified range, typically to ensure it matches the desired voltage level for safe and optimal operation of connected electrical equipment. By continuously monitoring the voltage and making real-time adjustments, the AVR helps prevent voltage fluctuations, voltage surges, and voltage drops, which can damage sensitive devices and disrupt electrical systems.

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Where is an AVR located in a generator?

Normally the generator AVR is located in one of three places. It can be in the main control box of the generator, in the alternators terminal box or it could be (only on very small portable units usually) located under the alternators rear cover.

What happens if a generator AVR fails?

If the AVR on your generator fails, then the generator will lose excitation. This loss of excitation will cause the voltage to fall suddenly at the generator and this loss of voltage should cause the generator to shut down on an under-voltage fault.

If your generator does not have under-voltage protection set, then the generator may continue to run, which could cause severe damage to your equipment.