Landis+Gyr E350 Series User Manual page 15

Description of Unit
10 kWh
0 kWh
–10 kWh
1st hour
L1 2 kWh
L2 5 kWh
L3 -3 kWh
Sum 4 kWh
Cum sum 4 kWh
Summation by
quantity (magnitude)
Σ+A/Σ–A
20 kWh
10 kWh
0 kWh
–10 kWh
1st hour
L1 2 kWh
L2 5 kWh
L3 -3 kWh
Sum 7 kWh
Cum sum 7 kWh
D000027979 en t – E350 Series 2, 3-Phase ZxF100Ax/Cx – User Manual
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
energy is imported (+A).
If the vectorial summation of all three vectors A
active energy is exported (–A). See following figure.
The same applies to reactive energy. A distinction of the different quadrants
is also possible.
2nd hour 3rd hour
2 kWh 2 kWh
5 kWh -5 kWh
3 kWh -3 kWh
10 kWh -6 kWh
14 kWh 8 kWh
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 and +A
1
the negative values (–A
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
counted. Negative magnitudes of A
For active energy export (–A) only negative magnitudes of A
counted. Positive magnitudes of A
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).
2nd hour 3rd hour
2 kWh 2 kWh
5 kWh -5 kWh
3 kWh -3 kWh
10 kWh 2 kWh
17 kWh 19 kWh
Fig. 1.3 Example magnitude summation active energy (left: +A, right –A)
, A
L1
10 kWh
0 kWh
–10 kWh
L1
L2
L3
Sum
Cum sum
in example 1), measured quantity –A only
3
in example 1), provided any are present.
2
, A , A
L1 L2 L3
, A , A are discarded.
L1 L2 L3
20 kWh
10 kWh
0 kWh
–10 kWh
1st hour
L1 2 kWh
L2 5 kWh
L3 -3 kWh
Sum 3 kWh
Cum sum 3 kWh
, A is positive, then active
L2 L3
, A , A is negative, then
L1 L2 L3
1st hour 2nd hour
2 kWh 2 kWh
5 kWh 5 kWh
-3 kWh 3 kWh
4 kWh 10 kWh
4 kWh 14 kWh
, A , A
L1 L2
are discarded.
, A , A
L1 L2
2nd hour 3rd hour
2 kWh 2 kWh
5 kWh -5 kWh
3 kWh -3 kWh
0 kWh 8 kWh
3 kWh 11 kWh
15/56
3rd hour
2 kWh
-5 kWh
-3 kWh
0 kWh
14 kWh
are
L3
are
L3
© Landis+Gyr