UNE-EN IEC 60152:2021 Designation of phase differences by hour numbers in three-phase AC systems (Endorsed by Asociación Española de Normalización in October of 2021.)
2021UNE-EN IEC 60152:2021 Designation of phase differences by hour numbers in three-phase AC systems (Endorsed by Asociación Española de Normalización in October of 2021.)