VAMP 257
Feeder and motor manager
Technical description
VAMP Ltd
84
VAMP 24h support phone : +358 (0)20 753 3264
VM257.EN002
Figure 2.4.2-2 Quadrants of power plane
Power
quadrant
Current
related to
voltage
Power
direction
cosfii Power
factor
+ inductive
Lags
Forward
+
+
+ capacitive
Leads
Forward
+
-
- inductive
Leads
Reverse
-
+
- capacitive
Lags
Reverse
-
-
2.4.3.
Harmonics and Total Harmonic Distortion
(THD)
The device calculates the THDs as percentage of the base
frequency for currents and voltages.
The device calculates the harmonics for phase currents and
phase voltages from the 2
nd
to the 15
th
order. (The 17
th
harmonic component will also be shown partly in the value of
the 15
th
harmonic component. This is due to the nature of
digital sampling.)
2.4.4.
Voltage interruptions
The manager includes a simple function to detect and measure
voltage sags.
The function calculates the number of voltage interruptions
and the total time of the voltage interruptions within a period.
The period is based on the real time clock of the device. The
available periods are:
•
8 hours,
00:00 – 08:00, 08:00 – 16:00, 16:00 – 24:00
•
one day,
00:00 – 24:00
•
one week, Monday 00:00 – Sunday 24:00
•
one month, the first day 00:00 – the last day 24:00
•
one year, 1
st
January 00:00 – 31
st
December 24:00
