Power generation, transmission and distribution
AbstractIEC 60027-7:2010 is applicable to generation, transmission, and distribution of electric energy. It gives names and letter symbols for quantities and units. In addition, rules for multiple sub******s and their succession are given. It is an addition to IEC 60027-1. Therefore letter symbols already given in IEC 60027-1 are repeated only if they have a special meaning in the field of power generation, transmission, and distribution
or if they are used in this field with special sub******s.
https://webstore.iec.ch/publication/97
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