A selfexcited generator is loaded so that the output voltage

A self-excited generator is loaded so that the output voltage is zero. With the field current also zero there is still a small output current. Why does this occur?

Solution

As the name indicates that for self excited generator no other source will present for developing flux. The generator it self should develop this flux and thus builds up induced voltage across its terminals.

This is due presence of \" Residual Magnetic field in the field coil \" which is very important for genrator to operate. Without this residual magnetic field generator won\'t be able to develop induced voltage.

Thus initially without any current in the field and voltage across the terminal of generator , self induced generator will circulate small current generated due conductors cutting the residual flux. Thus this small current will further increase in flux and thus increase in induced voltage and thus increase in terminal voltage.

If we load the generator in such a way terminal voltage is zero and filed current is also zero but due residual magnetic flux, small voltage will be induced and it cause currrent to flow in the output circuit .