Dry-type transformers 50 Hz, 100 up to 2500 kVA; general requirements and requirements for transformers U<(Index)m> up to 24 kV; German version of HD 538 S1:1992— 11 стр.
Three-phase dry-type distribution transformers 50 Hz, from 100 to 2500 kVA, with highest voltage for equipment not exceeding 36 kV - Part 3: Determination of the power rating of a transformer loaded with non-sinusoidal current; German version HD 538.3 S1:1997— 4 стр.
Dry-type transformers 50 Hz, 100 up to 2500 kVA - Part 1: General requirements and requirements for transformers U<(Index)m> up to 24 kV; Amendment 1:1995; German version HD 538.1 S1/A1:1995— 3 стр.
Dry-type transformers 50 Hz, from 100 to 2500 kVA - Part 2: Supplementary requirements for transformers with highest voltage for equipment at 36 kV; German version HD 538.2 S1:1995— 5 стр.