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NORMA 6003/NORMA 6003+/NORMA 6004/NORMA 6004+
Users Manual
22
3P3W3M
Figure 10. 3P3W3M Wiring
For 3P3W3M wiring, 3 voltage measurement channels are respectively bridged between 2 phase lines.
3 current measurement channels are respectively connected in series with each phase line or clamped
on each phase line with a current sensor.
For this wiring system:
1. This wiring system has the same impedance characteristics for 3 phases, a balanced
measurement system can be established.
2. When measuring the frequency conversion system with the power frequency input, this wiring
system can appropriately eliminate the power frequency component in the frequency conversion
signal, which is conducive to more accurately capturing the conversion frequency.
3. The line voltage is directly measured, and the phase voltage is calculated by Δ. It is more suitable
for measuring systems of Δ connections.
4. The neutral line current can be measured by summing 3 current channel, but the neutral line
voltage cannot be measured. When the neutral line voltage/neutral line current is present, the total
power measured is also inaccurate.
I3
A
I1
I2
U2
U1
U3
B
C
Source
Load
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