DIN EN 60076-4:2003 Power transformers - Part 4: Guide to lightning impulse and switching impulse testing; Power transformers and reactors (IEC 60076-4:2002); German version EN 60076-4:2002
2003DIN EN 60076-4:2003 Power transformers - Part 4: Guide to lightning impulse and switching impulse testing; Power transformers and reactors (IEC 60076-4:2002); German version EN 60076-4:2002