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Communication & Verification
DENT Instruments
PowerScout HD
CT Orientation Check
The PSHD meter reports power and energy in each electrical quadrant under a different register. When
CTs are installed backwards, the indicated current vector is oriented 180 degrees away from the true
displacement angle. In accordance with standard definitions, the Wattage and VARs of the effected
channel report with a sign opposite from what is expected. Often this means that the import registers
will be reading zero while the export registers are showing a value. Note that backward CTs have no
impact on the amplitude of the Power Factor. A moderate power factor (>0.7) in concert with a negative
power is a clue that the CT is on backwards but is on the correct phase.
Electrical Power Quadrants with Reversed CT shown
Check that the wattage has the correct sign (Desi for loads)
ViewPoint HD
: Real Time Values > (Confirm Sign of Power For All Elements)
PSHD Web App
: Real Time Values > (Confirm Sign of Power For All Elements)
LCD User Interface
: Real Time Values > (Confirm Sign of Power for Each Element)
If a CT is discovered to be on backwards after the installation is complete, the direction of the
CT can be reversed through a user configuration register designed for this purpose called the
“
Flipper
,” located at 2226, 2234, and 2235 or use ViewPoint HD’s meter setup.
www.
.com
1.800.561.8187
