Electrical engineering; earth, protective conductor, noisless earth; frame or chassis, class II equipment; graphical symbols on electrical equipment— 7 стр.
Transformers; three-phase oil immersed transformers with off-circuit tap-changer or with on-load tap-changer 12500 to 80000 kVA for 50 Hz and U<(Index)m> up to 123 kV; requirements and accessories— 12 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.