Oil immersed power transformers - Part 1: Oil-immersed MV/MV power transformers, 50Hz, from 3,150 MVA to 10 MVA, with highest voltage for equipment not exceeding 36 kV - Part 2: Oil-immersed MV/MV power transformers, 50Hz, from 50 kVA to 2,5 MVA, with highest voltage for equipment not exceeding 36 kV
The aim of these documents is to standardize oil-immersed power transformers with nominal voltages higher than the nominal voltages of existing standards