IEC standard voltages - supplementary remarks on the state of international standardization and european harmonization of nominal voltage 230/400 V and consequences of adaption from 220/380 V
Three-phase oil-immersed distribution transformers 50 Hz, 50 up to 2500 kVA; general requirements and requirements for transformers U<(Index)m> up to 24 kV; German version HD 428.1 S1:1992— 7 стр.
Transformers with copper windings; oil immersed natural cooling (S), three-phases, 50 Hz up to 630 kVA and insulation class 20 N (EEC standard series)— 2 стр.
Three-phase oil-immersed distribution transformers 50 Hz, 50 up to 2500 kVA; general requirements and requirements for transformers U<(Index)m> up to 24 kV; German version HD 428.1 S1:1992— 7 стр.
Transformers with copper windings; oil immersed natural cooling (S), three-phases, 50 Hz up to 630 kVA and insulation class 20 N (EEC standard series)— 2 стр.