Rockwell Automation 1404-M4_M5_M6_M8 Powermonitor 3000 User Manual, PRIOR to Firmware rev. 3.0 - Manual (Page 33)

Publication 1404-UM001D-EN-E - October 2004
Powermonitor 3000 Operations 3-7
Power Factor Results
The Powermonitor 3000 calculates true, displacement and distortion
power factor, each on a per-phase and total 3-phase basis. True power
factor is the ratio between the total true power and total apparent
power (in percent), and takes into account the effect of phase shift
between the voltage and current as well as any harmonics present.
Displacement power factor is the cosine of the difference between the
phase angle of the fundamental voltage and current (in percent), and
reflects the value a typical analog power factor meter would measure.
The true power factor and displacement power factor are equal only if
there are no harmonics present in either the voltage or current. These
values are signed to show lead (+) or lag (-). Distortion power factor is
the ratio between the magnitude of the fundamental and the sum of
the magnitudes for all of the current harmonics (in percent).
The power quantities (kW, kWh, kVAR, kVARh, and power factor) are
four-quadrant measurements. The Powermonitor 3000 measures and
expresses these measurements in a way that allows you to determine
the magnitude and direction of both the real power flow and the
reactive power flow. Figure 3.1 indicates the relationship between
these quantities and the numeric signs used by the Powermonitor
3000 to convey the information.
Table 3.4 Power and Power Factor Results
Parameter Description Range Units
Phase 1 Power Power of individual phase or sum of phases;
signed to show direction.
0 to 999.9x10
22 Watts
Phase 2 Power
Phase 3 Power
3-Phase Total Power
Phase 1 Reactive Power Reactive power of individual phase or sum of all
phases; signed to show direction.
0 to 999.9x10
22 VARs
(volt-amperes
reactive)
Phase 2 Reactive Power
Phase 3 Reactive Power
3-Phase Total Reactive Power
Phase 1 Apparent Power Apparent power of individual phase or sum of all
phases.
0 to 999.9x10
22 VA
(volt-amperes)
Phase 2 Apparent Power
Phase 3 Apparent Power
3-Phase Total Apparent Power
Phase 1 True Power Factor The ratio between the power and apparent
power for an individual phase or all three
phases; signed to show lead (+) or lag (-). -100 to 100 Percent
Phase 2 True Power Factor
Phase 3 True Power Factor
Total True Power Factor