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Power Analyzers
Operation
23
3P3W2M
Figure 11. 3P3W2M Wiring
For 3P3W2M wiring, 1 phase line (C) is used as a common line, 2 voltage measurement channels are
respectively bridged between the other 2 phase lines and this phase line. 2 current measurement
channels are respectively connected in series to the other 2 phase lines, or a current sensor is clamped
on the other 2 phase lines (Also known as two-wattmeter method or Aron method).
For this wiring system:
1. The wiring system can measure 3-phase system with only 2 channels, and 1-2 channels can be
reserved for measuring DC, single-phase AC or 3-phase AC (simultaneous measurement of 2-
channel 3-phase AC is only available for NORMA 6004/6004+).
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 system impedance for the 3 phases is different. The phase voltage and part of the line voltage
are calculated by Δ. In addition, this wiring system cannot measure the voltage and current of the
neutral line. When the neutral line voltage/neutral line current is present, the total power measured
is also inaccurate.
A
I1
I2
U1 U2
B
C
Source
Load
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