Description of Unit
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D000027979 en t – E350 Series 2, 3-Phase ZxF100Ax/Cx – User Manual
© Gyr
the sum corresponds to the difference between the positive and negative
values as shown in the figure below.
If the vectorial sum of the three vectors A
L1
, A
L2
, A
L3
is positive, then active
energy is imported (+A).
If the vectorial summation of all three vectors A
L1
, A
L2
, A
L3
is negative, then
active energy is exported (–A). See following figure.
The same applies to reactive energy. A distinction of the different quadrants
is also possible.
–10 kWh
0 kWh
10 kWh
1st hour
2 kWh
5 kWh
-3 kWh
4
kWh
4 kWh
2nd hour
2 kWh
5 kWh
3 kWh
10 kWh
14 kWh
3rd hour
2 kWh
-5 kWh
-3 kWh
-6 kWh
8 kWh
L1
L2
L3
Sum
Cum sum
–10 kWh
0 kWh
10 kWh
1st hour
2 kWh
5 kWh
-3 kWh
4
kWh
4 kWh
2nd hour
2 kWh
5 kWh
3 kWh
10 kWh
14 kWh
3rd hour
2 kWh
-5 kWh
-3 kWh
0 kWh
14 kWh
L1
L2
L3
Sum
Cum sum
Fig. 1.2 Example vectorial summation active energy (left ±A, right: only +A)
Summation by quantity separates the positive from the negative values of
the individual phases. Measured quantity
+A therefore only includes the
positive values (+A
1
and +A
3
in example 1), measured quantity
–A only
the negative values (–A
2
in example 1), provided any are present.
In case of a connection error, the meter measures correctly the real energy
consumption. It also measures a real export in the correct way.
For active energy import (+A) only positive magnitudes of A
L1
, A
L2
, A
L3
are
counted. Negative magnitudes of A
L1
, A
L2
, A
L3
are discarded.
For active energy export (–A) only negative magnitudes of A
L1
, A
L2
, A
L3
are
counted. Positive magnitudes of A
L1
, A
L2
, A
L3
are discarded.
The same applies to reactive energy. A distinction of the different quadrants
is also possible.
The following examples show the magnitude summation for active energy
import (left) and for active energy export (right).
–10 kWh
0 kWh
10 kWh
20 kWh
1st hour
2 kWh
5 kWh
-3 kWh
7 kWh
7 kWh
2nd hour
2 kWh
5 kWh
3 kWh
10 kWh
17 kWh
3rd hour
2 kWh
-5 kWh
-3 kWh
2 kWh
19 kWh
L1
L2
L3
Sum
Cum sum
–10 kWh
0 kWh
10 kWh
20 kWh
1st hour
2 kWh
5 kWh
-3 kWh
3
kWh
3 kWh
2nd hour
2 kWh
5 kWh
3 kWh
0 kWh
3 kWh
3rd hour
2 kWh
-5 kWh
-3 kWh
8 kWh
11 kWh
L1
L2
L3
Sum
Cum sum
Fig. 1.3 Example magnitude summation active energy (left: +A, right –A)
Summation by
quantity (magnitude)
Σ
+A/
Σ
–A
