Reliability Analysis of Active Distribution Systems

Defining Power System Health - Framework and Process Towards a System Health Index

“…However, since the emphasis is on assessing power quality on the global/system level, SARFIx index and its variations are chosen in the assessment of power system health. SARFIx is related to short-duration voltage variations and represents the mean number of RMS voltage variation events that occur during a determinate period of time for a customer, with a voltage magnitude below x% for sags or above x% for swells [82]. SIARFIx, SMARFIx and STARFIx are the same index as SARFIx, but are limited to events that last from 0.5-30 cycles, from 30 cycles to 3 seconds, and from 3 seconds to 60 seconds, respectively [71].…”