10-21
IM 253710-01E
Numerical Computations
10
Explanation
Select the display format of the phase difference
φ
of the voltage and current from the
following choices. This is valid during the normal measurement mode.
• 180 Lead/Lag
With the positive vertical axis set to zero degrees, this format displays
φ
using 180
°
notation with a lead indicated by the counter-clock wise direction and a lag by the
clockwise direction.
• 360 degrees
With the positive vertical axis set to zero degrees, this format displays
φ
using 360
°
in the clockwise direction.
Note
•
The display format in the harmonic measurement mode is fixed regardless of the selection as
follows.
Measurement function
φ
( ) is displayed using 360
°
representation in the clockwise direction.
Measurement functions
φ
U( ) and
φ
I( ) are displayed using 180
°
representation with respect to
the fundamental waves U(1) and I(1). The counter-clockwise direction is negative and
clockwise direction is positive.
•
When the voltage or current input is less than or equal to 0.25% of the measurement range,
an error [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 (D) and lag (G) are detected and displayed correctly.
•
When the computation result of power factor
λ
exceeds “1,”
φ
is displayed as follows:
•
When the power factor
λ
is greater than 1.001 and less than equal to 2.000,
φ
displays
zero.
•
When the power factor
λ
is greater than 2.001,
φ
displays an error [Error].
10.6 Selecting the Display Format of the Phase Difference