Question

draw three phase autotransformer step up and step down (show the difference) with voltage magnitude and...

draw three phase autotransformer
step up and step down (show the difference) with voltage magnitude and current directions
Engineering   Electrical-Engineering   
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Answer #1

As shown in the figure it is 3-phase step down Autotransformer which is used to compensate voltage drops as the there is series winding you can see the current directions and voltage magnitude as well.

As you can see this is 3-phase step up Autotransformer which shows the voltage magnitude as reverse of step down transformer and the current directions as well.

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