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Device handbook CENTRAX CU3000-CU5000
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Incoming / outgoing / inductive / capacitive
The device provides information for all four quadrants.
Quadrants are normally identified using the roman numbers
I, II, III and IV, as shown in the adjacent graphic. Depending
on whether the system is viewed from the producer or
consumer side, the interpretation of the quadrants is
changing: The energy built from the active power in the
quadrants I+IV can either been seen as delivered or
consumed active energy.
By avoiding terms like incoming / outgoing energy and
inductive or capacitive load when displaying data, an
independent interpretation of the 4-quadrant information
becomes possible. Instead the quadrant numbers I, II, III or
IV, a combination of them or an appropriate graphical
representation is used. You can select your own point of
view by selecting the reference arrow system (load or
generator) in the settings of the measurement.
Used symbols
For defining a measurement uniquely, a short description (e.g. U
1N
) and a unit (e.g. V) are often not
sufficient. Some measurements need further information, which is given by one of the following symbols
or a combination of these symbols:
Mean-value
Σ
HT
Meter (high tariff)
Mean-value trend
Σ
LT
Meter (low tariff)
Bimetal function (current)
Maximum value
Energy quadrants I+IV
Minimum value
Energy quadrants II+III
TRMS
True root-mean-square value
Energy quadrants I+II
RMS
Root-mean square value (e.g.
fundamental or harmonic content only)
Energy quadrants III+IV
(H1)
Fundamental component only
I,II,III,IV
Quadrants
ø
Average (of RMS values)
Examples
CU3000: Meters with tariff and
quadrant information
CU5000: User mean values, last
value
CU5000: User mean values, trend
