Questions regarding transformer's percent impedance in other than nominal voltages

[Reinserkmo]

Hello,

I'd like some help to consider the calculation of a current in a transformer's SC test. Suppose i have this theoretical transformer :

Vpri = 230 kV
Srated = 100 MVA
Z% = 5 %

For testing purposes, i'll use a 440 V generator to energize the transformer's primary side with its secondary side shorted. In order to calculate the current which will circulate in the primary side during the test, should i perform a p.u base change to 440V ? how would you guys calculate the current in A using p.u to solve the problem ?

Thanks in advance!