NF C53-701/A1*NF EN 62501/A1:2015 Voltage sourced converter (VSC) valves for high-voltage direct current (HVDC) power transmission - Electrical testing
2015NF C53-701/A1*NF EN 62501/A1:2015 Voltage sourced converter (VSC) valves for high-voltage direct current (HVDC) power transmission - Electrical testing