VOLTAGE VARIATIONS
 Variations are e valuated by co llecting st atistics: N , N 1 & N 2. Statistics are
collected as average voltage within intervals of 10 min in observation window
of 1 we ek. N - amount of intervals. N1 - intervals voltage exceeded [+10.0%,-
10.0%] bou ndary of n ominal. N 2 - intervals v oltage ex ceeded [+15.0%,-15.0%]
boundary of n ominal. C ompliance i f N /N1 > = 9 5.0% du ring t he e ntire
observation window. Intervals with voltage interruption are discarded. Intervals
with DIPS or OVER Voltage are discarded.
RAPID VOLTAGE CHANGES
 Rapid voltage change is based on a 3 Sec window in which RMS voltage min and
max v alues ar e o btained ( min,max v alues s hould b e w ithin +-10.0% f rom
nominal). T he r apid ch ange is t he p ercent o f d elta b etween m in an d m ax
divided b y av erage R MS o f 9 Sec. T he R apid p ercent r esults a re ev aluated
during o bservation w indow o f 1 w eek. R apid ch anges ar e l imited t o s pecific
count (N): Rapids of more 5.00% allowed: N <= 65536 occurrences.
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