Over time, HVDC technology evolved, adding voltage-sourced converters (VSC) and other innovations. So the standard was revised, renumbered, and expanded. Today, it is known as , covering a broader range of HVDC systems.
: The standard's system of empirical coefficients was derived from a limited number of experiments conducted before 2008. Acknowledging this, the standard itself notes that "The major problem has been a lack of experimental results" for some scenarios. The resulting correction factor often provides only a 10-20% adjustment, and some experts argue that focusing on accurately determining the fault current magnitude and duration can have a far greater impact on safety and design than fine-tuning the non-adiabatic effects. iec 949 pdf
Sizing medium-voltage cables for wind and solar farms where long cable runs make optimized cable sizing financially critical. : The standard's system of empirical coefficients was
