
26
UMG 509
Supporting measurement, input V4
Fig. Measurement in a three-phase 4-conductor
network with symmetric loading.
Fig. Measurement in a three-phase 3-conductor
network with symmetric loading.
Fig. Measurement of the voltage between N and PE.
Measurement of the current in the neutral conductor.
m
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.
m
For measurement with the supporting
measurement (V4), a voltage must be
connected to the baseline measurement
for frequency determination.
L1
L2
L3
N
V
4
N
4w 1m
I
4
S1 S2
L1
L2
L3
V
4
N
3w 1m
I
4
S1 S2
N
PE
V
4
N
2w 1n
I
4
S1 S2
L1
L2
L3
N
V
4
N
4w 1m
I
4
S1 S2
L1
L2
L3
V
4
N
3w 1m
I
4
S1 S2
N
PE
V
4
N
2w 1n
I
4
S1 S2
L1
L2
L3
N
V
4
N
4w 1m
I
4
S1 S2
L1
L2
L3
V
4
N
3w 1m
I
4
S1 S2
N
PE
V
4
N
2w 1n
I
4
S1 S2
m
Measured voltages and measured currents
must derive from the same network.
Содержание UMG 509
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