UNE-EN 60099-9:2014 Surge arresters - Part 9: Metal-oxide surge arresters without gaps for HVDC converter stations (Endorsed by AENOR in January of 2015.)
2015UNE-EN 60099-9:2014 Surge arresters - Part 9: Metal-oxide surge arresters without gaps for HVDC converter stations (Endorsed by AENOR in January of 2015.)