# What happens to the windings on a transformer during tap changing?

I'm trying to figure out what the windings do when a tap change occurs on a power transformer. The picture below is my understanding of how tap changing occurs when there is an increase in load on the TX. When the load increases and the volts drop on the secondary side of the TX. To compensate for that drop, either the Primary volts will need to increase or the primary winding will need to have some of its windings removed. In my calculations I removed a percentage of the windings to compensate for the volt drop. Does this picture explain correctly how tap changing occurs? Realistically I'm sure the primary volts gets reduced a bit as well but will it reduce as much as the secondary volts on load? I understand in the real world you would have a three phase either star and/or delta connected system, I just represented it as single phase for simplicity. P.S The value 10.75KV is just an arbitrary value chosen for the Vd. Thanks.