PPA55xx Quick User Guide
Page 54
Using the PPA5530 to measure 3 phase power with PWM drives
If there is access to the neutral point (star point) of a star wired load, then
accurate measurements can easily be made by connecting the measurement
channels in star configuration:
In this configuration, the data including rms voltage will be correct for each
phase, and the phase to phase voltage rms can be derived (set conversion to
“phase to phase rms”).
If, however, the neutral point is not available, then the measurement of the
voltage rms is more difficult. The options are to use a synthesised neutral or to
connect in delta configuration and derive the phase measurements.
Consider the synthesised neutral configuration:
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