Generator Automatic Voltage Regulator FAQ
2023-07-07
1.What is a Automatic Voltage Regulator?
An automatic voltage regulator (AVR) is a solid-state electronic device that automatically maintains the output voltage of a generator at a set value. It attempts to do this when the generator load or operating temperature changes. AVR is part of the excitation system of generator.
2.Who provides automatic voltage regulator?
Usually in a generator set, the generator manufacturer will provide an automatic voltage regulator with their AC generator. The largest manufacturers of diesel generators are Stamford AVR Mecc Alte, Leroy Somer and, most recently, WEG. The model provided will depend on the generator and any accessories, which may require a different AVR. An example of such an attachment is a PMG or auxiliary winding.
3.Where is an AVR located in a generator?
Typically, the generator AVR is located in one of three places. It can be in the main control box of the generator, in the junction box of the generator, or (usually only on very small portable units) located under the back cover of the generator.
4.How does an AVR work?
It controls the output by sensing the voltage from the generator terminals and comparing it with a stable reference. The error signal is then used to regulate the field current by increasing or decreasing the current flowing to the exciter stator, which in turn causes the voltage at the main stator terminal to decrease or increase.
5.Why does an automatic voltage regulator look like?
All of the AVRs look very similar - they differ slightly in size and color, but all seem to have similar features.There are also special looking AVR, like Denyo AVR.
6.What happens if a generator AVR fails?
If the AVR on the generator fails, the generator will lose excitation. This excitation loss will cause a sudden drop in the generator voltage, and this voltage loss will cause the generator to shut down in the event of an under voltage failure.
If your generator is not equipped with under voltage protection, then the generator may continue to run, which can cause serious damage to your equipment.
7.Do all generators have AVR?
Unregulated generators, that is, generators without an automatic voltage regulator (AVR), usually do not adequately meet the power needs and requirements of every device or device connected to the generator. This is because some unstable generators cannot control or regulate the voltage, so the terminal voltage will continue to decrease as the load requirements continue to increase.
If the generator's voltage is not maintained at a constant fixed rate, the overall performance of the generator may be negatively affected, and any utility, equipment, or machinery powered by the generator may also be negatively affected by an unstable generator.
The automatic voltage regulator (AVR) is directly related to the performance and life of the generator, as well as the project that the generator provides power to, and ensures that the output voltage remains consistent across the load current even if fluctuations occur in the background. This helps mitigate or even eliminate any damage that fluctuations can cause to appliances, machinery, equipment and appliances.
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