Why does the generator outlet voltage increase when the load decreases?

There are several factors that cause the generator load to decrease and its outlet voltage to increase:

1) The internal resistance voltage drop decreases and the voltage increases;

2) Due to the decrease in load, the engine speed increases slightly (if the reactive load is reduced, the engine speed will not change);

3) The demagnetization armature reaction decreases, causing the power generation to The machine voltage rises.

The influence of the first factor is very small, because the internal resistance of the generator is generally very small; the influence of the second factor is even smaller, because of the function of the generator prime mover speed regulator, the change of the generator speed is Very small, if the reactive load is reduced, the prime mover speed will not change; the third factor has the greatest impact, which directly causes the generator voltage to fluctuate, and its role accounts for about 80-90%.

Note: The load referred to here refers to the inductive load under normal circumstances;

If it is a capacitive load, as the load decreases, the generator outlet voltage may It will rise!