This standard specifies additional letter symbols and subscripts for the filed of electric power systems and power supply. It is a supplement to the standard on general letter symbols DIN 1304 part 1.
DIN 1304-3:1989 history
2011DIN EN 60027-7:2011 Letter symbols to be used in electrical technology - Part 7: Power generation, transmission and distribution (IEC 60027-7:2010); German version EN 60027-7:2010
1989DIN 1304-3:1989 Letter symbols for physical quantities; symbols to be used for electric power systems