IEC/TR 60919-2:2008+A1:2015 provides guidance on the transient performance and fault protection requirements of high voltage direct current (HVDC) systems. It concerns the transient performance related to faults and switching for two-terminal HVDC systems utilizing 12-pulse converter units comprised of three-phase bridge (double way) connections but it does not cover multi-terminal HVDC transmission systems. However, certain aspects of parallel converters and parallel lines, if part of a two-terminal system, are discussed. The converters are assumed to use thyristor valves as the bridge arms, with gapless metal oxide arresters for insulation co-ordination and to have power flow capability in both directions.Diode valves are not considered in this report. This second editioncancels and replaces the first edition, published in 1991, and constitutes a technical revision. It includes the following main changes with respect to the previous edition:
- it concerns only line-commutated converters;
- isignificant changes have been made to the control system technology;
- some environmental constraints, for example audible noise limits, have been added;
- the capacitor coupled converters (CCC) and controlled series capacitor converters (CSCC) have been included. This consolidated version consists of the second edition (2008) and its amendment 1 (2015). Therefore, no need to order amendment inaddition to this publication.