3.3 Voltage sags and swells
3 Supporting functions
Technical description
88
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VM55.EN005
3.3.
Voltage sags and swells
VS_SagSwell
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
voltage sag and swell monitoring.
VAMP provides separate monitoring logs for sags and swells.
The voltage log is trigged, if any voltage input either goes
under the sag limit (U<) or exceeds the swell limit (U>). There
are four registers for both sags and swells in the fault log. Each
register will have start time, phase information, 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.
The voltage power quality functions are located under the
submenu “U”.
Setting parameters of sags and swells monitoring:
Parameter Value
Unit
Default Description
U>
20 … 150
%
110
Setting value of swell limit
U<
10 … 120
%
90
Setting value of sag limit
Delay
0.04 … 1.00
s
0.06
Delay for sag and swell
detection
SagOn
On; Off
-
On
Sag on event
SagOff
On; Off
-
On
Sag off event
SwelOn
On; Off
-
On
Swell on event
SwelOf
On; Off
-
On
Swell off event
