VAMP 257
Feeder and motor manager
Technical description
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VAMP 24h support phone : +358 (0)20 753 3264
VM257.EN002
Setting parameters of the voltage sag measurement
function:
Parameter Value
Unit Default Description
U1<
10.0 … 120.0
%
64
Setting value
Period 8h;
Day;
Week;
Month
- Month Length of the observation
period
Date
-
-
Date
Time
-
-
Time
Measured and recorded values of voltage sag measurement
function:
Parameter Value Unit Description
Voltage LOW;
OK
-
Current voltage status
Measured
value
U1 %
Measured positive sequence
voltage
Count
-
Number of voltage sags
during the current
observation period
Prev
-
Number of voltage sags
during the previous
observation period
Total
s
Total (summed) time of
voltage sags during the
current observation period
Recorded
values
Prev
s
Total (summed) time of
voltage sags during the
previous observation period
2.4.5.
Voltage sags and swells
The power quality of electrical networks has become
increasingly important. The sophisticated loads (e.g. computers
etc.) require uninterruptible supply of “clean” electricity. VAMP
protection platform provides many power quality functions that
can be used to evaluate, monitor and alarm on the basis of the
quality. One of the most important power quality functions are
sag monitoring and swell monitoring.
VAMP provides separate monitoring logs for sags and swells.
The voltage log is trigged, if any voltage input either decreases
under the sag limit (U<) or increases over the swell limit (U>).
There are four registers for both sags and swells in the fault
log. Each register will have start time, type (which phases),
duration, minimum, average, maximum voltage values of each
sag and swell event. Furthermore, there are total number of
sags and swells counters as well as total timers for sags and
swells.
