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UMG 96-PA / UMG 96-PA-MID / UMG 96-PA-MID+
7.5.1 Current direction
You can correct the current direction for each
phase individually via the serial interfaces pro-
vided. This means that in the case of incorrect
connection, no subsequent reconnection of the
current transformers is necessary.
7.5.2 Summation current measurement
For a summation current measurement via two
current transformers, first set their total ratio on
the device. The setting of the current transform-
er ratios is described in section 12.4.3 on page
41.
Example:
The current is measured via two current trans-
formers. Both current transformers have a ratio
of 1000/5 A. The summation measurement is
carried out with a summation current transformer
of 5+5/5 A.
The device must then be adjusted as follows:
Primary current: 1000 A + 1000 A = 2000 A
Secondary current: 5 A
UMG
S
2
I
S
1
P
1
P
2
Einspeisung 1
Supply 1 Einspeisung 2
Supply 2
1P
1
1P
2
(K)
(L)
(k)
(l)
1S
2
1S
1
1S
1
1S
2
2S
1
2S
2
2S
1
2S
2
(k)
(l)
(K)
(L)
2P
1
2P
2
Verbraucher A
Consumer A Verbraucher B
Consumer B
Fig. Example for current
measurement via a
summation current
transformer
7.5.3 Ammeter
If you want to measure the current not only with
the UMG, but also with an ammeter, connect the
ammeter to the UMG in series.
UMG
S
2
I
S
1
Einspeisung
Supply Verbraucher
Consumer
A
(k)S
1
S
2
(l)
P
2
(L) (K)P
1
Fig. Circuit diagram
with additional
ammeter con-
nected in series
S1 S2
S1 S2
S1 S2
Fig.:
Current measurement
via current transformer
in a three-phase 4-con-
ductor system
S1 S2
S1 S2
Fig.:
Current measurement
in a single-phase 3-con-
ductor system
S1 S2
S1 S2
Fig..:
Current measurement
via 2 current transform-
ers in a three-phase
4-conductor system
L1
N
S1 S2
Fig.:
Current measurement in a
single-phase 2-conductor
system
NOTE
If the measuring range is exceeded, the device
display shows the warning Overrange with
specification of the current or voltage circuit.
For information on overrange, see the chapter
„13.7 Overrange“ on page 53.
7.5.4 Connection variants for current
measurement
Load
Load
Load
Load