1. What is AVR ?
An Automatic Voltage Regulator is an 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. The error signal is then used to adjust an average and value of the field current.
2. Function of AVR
Automatic voltage regulator helps to provide energy in exciter of a generator. The AVR components of your. Genset’s main function is to assert and sustain the appropriate voltage level range for your generator.
Automatic voltage regulator is a device which maintains the generator output terminal voltage. To be more accurate, AVR is a controller which always compares the generator output terminal voltage V(t) with the set reference voltage V(ref) and as per signal i.e. (Vref – Vt) it changes the field excitation of generator to maintain constant terminal voltage.
3. What happens if AVR fails?
When AVR fails, a protection called field failure protection will comes into picture and trip the generator. If failure of field is associated with under voltage which might happen due to severe fault near the generator and unable to maintain
the voltage, then the generator tripped instantaneously.
4. How do you adjust AVR?
With a flat head screw driver, turn the jeweler screw counter clockwise, this will lower the voltage. As screw is turned back, watch the voltmeter to see the desired adjustment. Keep doing the adjustment until reach to the desired voltage.
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