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Use Impedance I/O Code = 2, for impedance on winding MVA.

Enter X1-2 and X3-1 as 0.13 pu on 62.5 MVA base.

X-2-3 is not given. Assume something, e.g. 0.3 pu on 62.5 MVA base.

The data record looks like this:

In 100 MVA base the reactance for each leg of the transformer is -0.032, 0.24 and 0.24 pu.

The reactance from winding 1 to 2 is 0.24-0.032 = 0.208 pu on 100 MVA base. On transformer base the reactance is 0.208*62.5/100 = 0.13 pu.

In this example the bus base voltage is the same as the nominal voltages of the transformer.