The direction of reactive power is divided into four quadrants. Reactive power may be inductive or
capacitive on both forward and reverse directions. Reactive power quadrant can be indicated with Tan
(φ) (tangent phi), which is calculated according the following formula:
Power factor calculation is done similarly to the power factor calculation but the polarity is de ned by
the reactive power direction. Therefore, the power factor is calculated with the following formula:
Only line-to-line voltages available
If the line-to-line voltages are measured but the zero sequence voltage is not measured or is not
otherwise known, the three-phase power calculation is based on Aron’s theorem:
Both cos(φ) and tan(φ) are calculated in the same way as in the line-to-neutral mode.
Troubleshooting
Check the "Troubleshooting" section in chapters “Current measurement and scaling” and “Voltage
measurement and scaling” for more information. Most power and energy measurement problems are
usually related to the same issues (i.e. wiring errors, wrong measurement modes, faulty frequency
settings, etc.).
Settings
Table. 5.2.3. - 35. Power and energy measurement settings
Name
Range
Step
Default
Description
AQ-E215
Instruction manual
Version: 2.01
59
© Arcteq Relays Ltd
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