Energy performance of large power transformers (U<(Index)m> <größer> 36 kV or S<(Index)r> <größer => 40 MVA); German version EN 50629:2015 + A1:2016 + A2:2018— 48 стр.
Power transformers -- Part 19: Rules for the determination of uncertainties in the measurement of the losses on power transformers and reactors (IEC/TS 60076-19:2013, modified) (english version)