IEC 62501:2009+A1:2014 applies to self-commutated converter valves, for use in a three-phase bridge voltage sourced converter (VSC) for high voltage d.c. power transmission or as part of a back-to-back link. It is restricted to electrical type and production tests. This consolidated version consists of the first edition (2009) and its amendment 1 (2014). Therefore, no need to order amendment in addition to this publication.