janitza UMG 605 PRO, User Manual And Technical Data, Page: 26 / 87

UMG 605-PRO
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21
6. 6. 2 Supporting measurement, input V4
Three-conductor connection
Fig. Measurement via a current transformer in a three-
phase 4-conductor network with symmetric loading.
Fig. Measurement via a current transformer in a three-
phase 3-conductor network with symmetric loading.
Fig. Measurement via a current transformer.
L1
L2
L3
N
L
4
N
4w 1m
I
4
S1 S2
L1
L2
L3
L
4
N
4w 1m
I
4
S1 S2
L
L
4
N
2w 1n
I
4
S1 S2
N
L1
L2
L3
N
L
4
N
4w 1m
I
4
S1 S2
L1
L2
L3
L
4
N
4w 1m
I
4
S1 S2
L
L
4
N
2w 1n
I
4
S1 S2
N
L1
L2
L3
N
L
4
N
4w 1m
I
4
S1 S2
L1
L2
L3
L
4
N
4w 1m
I
4
S1 S2
L
L
4
N
2w 1n
I
4
S1 S2
N
C
NOTE!
If the baseline measurement (inputs
V1-V3) is connected to a three-phase
3-conductor network, the supporting
measurement (input V4) can no longer
be used as a measurement input.
C
NOTE!
For measurement with the supporting
measurement (V4), a voltage must be
connected to the baseline measurement
for frequency determination.
C
NOTE!
Measured voltages and measured
currents must derive from the same
network.