This document defines type, production and optional tests on thyristor valves used in thyristor controlled reactors (TCR), thyristor switched reactors (TSR) and thyristor switched capacitors (TSC) forming part of static VAR compensators (SVC) for power system applications. The requirements of the document apply both to single valve units (one phase) and to multiple valve units (several phases).dition 3.0 2021-10 INTERNATIONAL STANDARD NORME INTERNATIONALE Static VAR compensators (SVC) – Testing of thyristor valves Compensateurs statiques de puissance réactive (SVC) – Essais des valves à thyristors IEC 61954:2021-10(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright ？ 2021 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may