AcquiSuite Ally 12 & 48 User Guide (Rev D)
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PHASE CHECKING BY PHASOR PLOT
When a CT is installed on the incorrect phase, the indicated current vector is pointing either 180 degrees
away (a split phase system) or 120 degrees away (a three-phase system) from the true displacement angle.
In the latter case, this usually causes a significant decrease in the reported power factor, even if the CT is
also on backwards. When the absolute displacement power factor of a load is below 0.55 (an angle greater
than 57 degrees between voltage and current) the AcquiSuite™ Ally meter will flag it as a phasing error.
Obvius Ally Configuration Console has a PhasorPlot feature that can be used to study the voltage and
current vectors of a given meter element.
Check for Low Power Factor
▪ Obvius Ally Configuration Console: Real Time Values > (All power factors < 0.55 are
shown in RED)
▪ AcquiSuite™ Ally Web App: Real Time Values > (All power factors < 0.55 are shown in
RED)
▪ LCD: Verify Installation > (LCD will list all elements having a PF < 0.55)
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Electrical Power Quadrants with Incorrect CT Phase shown
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