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.