Bender B 9310 0735, Manual

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Power Quality
45 PEM735_D00084_00_M_XXEN/02.2015
The display shows
7.3.3 Rapid Voltage Changes
Rapid voltage changes are rapid variations of the r.m.s. value between two consecutive
voltage values. These changes are distinguishable by definite but unspecified dura-
tions.
Rapid voltage changes can be due to load variations in the network users' installation
or switching in the system, or by faults.
If in the case of rapid voltage changes the conditions of voltage dips or swells are met,
the occurring events are often considered as voltage dips or swells rather than rapid
voltage changes.
Display text Description Note
Limit (%)
Permissible deviations from the
nominal voltage
U
n
(tolerance
band)
Left column : max. 10 % per-
missible deviation for 95 % of
the measured values (narrow
limits)
Right column : -15/+10 % for
all measured values (wide lim-
its)
Tolerance (%)
Number of measured values [%]
which must be within the toler-
ance band of one measurement
period.
U1…3 Actual
(%)
Number of measured values [%]
within the tolerance band of one
measurement period.
Result Limit values complied with?
Measured
U1…3 range
Range of measured values for
U
L1…3
Absolute values in V