Annex J provides guidance on the end-of-life and replacement of older Silicon Carbide (SiC) gapped arresters. Critical Changes in the 2018 Edition
In short, if you are designing a substation or a wind farm, you need IEC 60099-5. It is not just a test standard – it is a .
. This is the maximum voltage that appears across the terminals of an arrester during the passage of a surge current. Because this parameter directly affects the insulation coordination of the entire substation, the standard provides typical maximum residual voltage values (found in Annex F) to help users match the arrester to their specific system needs.