49 Siemens Industry, Inc.
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 MD-xxHD meter will flag it as a phasing
error. ViewPoint HD 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
ViewPoint HD: Real Time Values > (All power factors < 0.55 are shown in RED)
MD-xxHD 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)
Electrical Power Quadrants with Incorrect CT Phase shown
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