One of the best and most famous types of generator voltage regulator is Stamford AVR SX440 produced in England. It is installed on all types of Stamford UK generators from 300 to 800 kVa and stabilizes the generator voltage.
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 rotor of the generator that when the generator is rotated by its driver, a small voltage appears at the output, which is about 6 up 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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