A stp-down transformer steps voltage down from a high value to a low value. Transformers only work with AC.
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The same transformer can be both. It must be operated at the correct voltage on both windings.
the difference between a step up transformer and a step down transformer is that, in a tsep up transformer, the voltage secondary is greater than the primary side but in a step down transformer, the voltage secondary is lesser than the primary side
Yes, when using a step down transformer the amperage is affected.
If these are the exact voltages that you need you will need an auto transformer to obtain these voltages. If these voltages are nominal voltages and are of a three phase four wire configuration, the 220 voltage can be obtained from the three phase legs to the neutral (ground) connection. The equation to use is 400/1.73 = 231 volts.
A transformer used to step up or down the value of voltage.