This is the VA-based version of tsiPhaseInstalledPowerRatioW, again excluding redundant modules from the capacity denominator, so it represents the most conservative apparent-power utilization figure for this phase, the number that best reflects true risk if the phase's load has a non-unity power factor and it also lost a redundant module. It is the strictest of the four ratio objects on this phase, so it's the one most likely to cross an alarm threshold first if both redundancy loss and poor power factor are simultaneously in play. An admin building a tiered alerting scheme for this power system would treat a threshold breach on this specific ratio as the most urgent of the four, since it combines both worst-case assumptions.