Answer Posted / tse-wang

All answers are correct and more closely the answer No.3.
However, i am not comfortable with the fuction of the OLTC
described here in the forum:

The function of the OLTC (On-load-tap-changer) is to
maintain/regulate the output voltage of the transformer.
(This is general answer).

Technically, we are trying to change the winding turns
ratio (N2/N1) to change the mutual induction between the
two (or may be 3) windings.

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