33KV/11KV, 15MVA, ONAN cooling.Deji...
Please note, it starts with several relatively simple tests to detect if the Xfmr was unintentionally damaged during the time it was de-energized to the day it's to be re-energized !
If those tests lead to "NO !" Then energize and load it !
BTW, can you provide some info as to Voltage, kVA, Air/Oil cooling, and if equipped with cooling fans !
Phil