2500 KVA 50 Hz isolation level 125-50/10, conforms to NF C 52 112-1 (06/94) coupling Dyn11, Primary tension 1=21000 volt, 2=20500 volt, 3=20000 volt, 4=19500 volt, 5=19000 volt, secondary tension 3=410 volt, primary current 72.2 Amps, secondary 3520 Amps, Ucc 6%, Aluminium windings, method of cooling ONAN,