Bender B93100735, Manual

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Power Quality
60 PEM735_D00084_02_M_XXEN/06.2020
Fig. 6.20: Voltage sags (detailed view on page 1 of 3)
For voltage sag classification, the percentages of the voltage levels u are summarised as
follows:
90 ≥ u ≥ 80
80 > u ≥ 70
70 > u ≥ 40
40 > u ≥ 5
5 > u
The display shows:
Note: If the "Sliding Reference Voltage U
sr
" detection method is used, the calculation should
be made using a first order and a constant set to one minute.
U
sr(n)
= 0.9967 x U
sr(n-1)
+ 0.0033 x U
(10/12)rms
Display text Description
Residual Voltage
Residual voltage level U
res
t Duration of the voltage sag (ms)
90>u>=80 Classification of the voltage sag (% of the residual voltage)
10<t<=200 Classification of the voltage sag (duration t in ms)