The AS440 voltage regulator is a product of Stamford, England, which can be installed and operated on Stamford generators from 20 to 300 kVa in order to regulate the generator voltage and stabilize it.
The way the AVR of the Stamford generator works is that when the diesel generator starts working, there is a small magnetic hysteresis on the generator rotor; When the generator is rotated by its driver, a small voltage appears at the output, which is something around 6 to 40 volts, which varies depending on the type of generator. AVR takes this voltage from the output and applies it to excite the generator. As a result, as the excitation voltage increases, the output of the generator increases again. AVR repeats this process until the generator voltage reaches the rated value; Now, if the output voltage increases for any reason, the AVR generator immediately reduces the excitation power supply. If the generator output voltage drops, the AVR will increase the excitation supply.
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