3.4 Voltage sags and swells
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3.4. 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
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:
Setting value of swell limit
Setting value of sag limit
Delay for sag and swell
detection
Recorded values of sags and swells monitoring:
Cumulative sag time
counter
Cumulative swell time
counter
Time stamp of the sag/swell
Voltage inputs that had the
sag/swell
Duration of the sag/swell
Minimum voltage value
during the sag/swell in the
input 1
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