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Description of Unit
© Gyr
D000027979 en t – E350 Series 2, 3-Phase ZxF100Ax/Cx – User Manual
This method summates the quantity of the individual phases independent
of the energy direction. A connection error – however – has no effect on the
result of measurement.
But if there is a real export in one phase, this method leads to incorrect
measurement results.
With this method the meter adds exported and imported energy. This
method only makes sense if the utility is sure there is no energy export.
This method is available in vectorial and magnitude summation mode.
The absolute magnitude summation can be used as an anti-tampering
measure. Here negative magnitudes of A
L1
, A
L2
, A
L3
are added to the positive
magnitudes of A
L1
, A
L2
, A
L3
. See example below.
–10 kWh
0 kWh
10 kWh
20 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
20 kWh
L1
L2
L3
Sum
Cum sum
–10 kWh
0 kWh
10 kWh
20 kWh
1st hour
2 kWh
5 kWh
-3 kWh
10
kWh
10 kWh
2nd hour
2 kWh
5 kWh
3 kWh
10 kWh
20 kWh
3rd hour
2 kWh
-5 kWh
-3 kWh
10 kWh
30 kWh
L1
L2
L3
Sum
Cum sum
30 kWh
Fig. 1.4 Example absolute value summation active energy (left: combined sum,
vectorial, always positive; right: combined sum, magnitude, always positive
per phase)
With this method the meter subtracts an exported energy from the
imported. It cannot detect a connection error.
Use of vectorial and magnitude mode
ZFF meters must work in vectorial mode – we do not have energy values
for each phase (3 phases and only 2 measurement systems).
For ZMF, most of the customers, use vectorial mode too. Only some
customers use magnitude mode, mainly for tamper prevention
.
F-circuit
With F-circuit (Aron connection), only the sums of +R and -R are
calculated.
Summation by single
quantities
Σ
|A Lx|
Summation by
Absolute value
|+A| + |–A|
Subtraction
|+A| – |–A|
