2015UNE-EN 62271-3:2015 High-voltage switchgear and controlgear - Part 3: Digital interfaces based on IEC 61850 (Endorsed by AENOR in November of 2015.)
2007UNE-EN 62271-3:2007 High-voltage switchgear and controlgear -- Part 3: Digital interfaces based on IEC 61850 (IEC 62271-3:2006).