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3P4W3M
For 3P4W3M wiring, 3 voltage measurement channels are respectively connected between each
phase line and the neutral line. 3 current measurement channels are respectively connected in series
with each phase line or clamped on each phase line with a current sensor.
For systems without neutral lines, connect 3 voltage measurement channels between the 3 phase lines
and the common ground line. For a 3P5W system, you can use a wiring group of 3P4W3M to measure
the phase and neutral line. You can select one channel and configure it as 1P2W1M to measure the
parameters between the neutral and ground line (NORMA 6004/6004+ only). If the ground and neutral
lines do not exist, connect the common ends of the 3 channels together and suspend, and the total
power measured is still valid.
For this wiring system:
1. The wiring system has the same impedance characteristics for 3 phases, a balanced measurement
system can be established.
2. The wiring system has a terminal for neutral or ground, the common mode component input to the
instrument is small, which reduces the effect of common mode components on the measurement
results.
3. The phase voltage is directly measured, and the line voltage is calculated by Δ. It is more suitable
for measuring systems of star connections.
Source
I
1
A
I
2
B
I
3
C
U
1
N
Figure 9. 3P4W3M Wiring
Load
U
U
2
3
Power Analyzers
Operation
21
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