5-29
IM 760301-01E
5
Power Measurement
Explanation
The phase difference f between the voltage and current indicates the position of the
current phase with respect to the voltage of each element. You can select the display
mode from below.
• 180 Lead/Lag
If the current phase is in the counterclockwise direction with respect to voltage, the
current is leading (D) the voltage. If the current phase is in the clockwise direction with
respect to the voltage, the current is lagging (G) the voltage. The phase difference is
expressed by an angle between 0 to 180°.
• 360 Degrees
The phase difference is expressed using an angle between 0 and 360° in the
clockwise direction.
Note
• If the measured value of the voltage or current input is zero, [Error] is displayed.
• When both the voltage and current are sinusoids and the ratio of the voltage and current
inputs do not differ greatly with respect to the measurement range, the phase difference φ of
lead and lag are detected and displayed correctly.
• If the computation result of power factor λ exceeds “1,” φ is displayed as follows:
• If the power factor λ is greater than 1 and less than equal to 2, φ displays zero.
• If the power factor λ is greater than 2, φ displays and error.
• The phase difference, fU and fI, of harmonic order 1 to 100 of the voltage and current on the
harmonic measurement option is always displayed using an angle between 0 and 180∞ (no
sign for lead and negative sign for lag).
5.10 Selecting the Display Format of the Phase Difference
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