YOKOGAWA CW140, User Manual, Page: 184 / 292

IM CW140-E
19-4
cos
–1
(
( P)
2
+( Q)
2
)
•
For distortion wave input: There may be discrepancies between the CW140 and
other instruments that operate based on other measurement principles.
• Power factor and phase angle polarity : Determined by reactive power polarity.
•
If either voltage or current input is 0.4% or less of range rating:
0 (zero) is displayed for Reactive power 2* and apparent power.
    (dashes) are displayed for factor and phase angle.
Reactive power 2*: without reactive power meter method.
1
φ
2W
1 φ 3W
3 φ 3W
Q i=
(VAi)
2
—Pi
2
i=1, 2
Q=Q1+Q2
Q i=
(VAi)
2
—Pi
2
i=1, 3
Q=Q1+Q3
Q i=
(VAi)
2
—Pi
2
i=1, 3
Q
=Q1+Q3
Q i=
(VAi)
2 —Pi 2
i=1, 2, 3
Q= Q1+Q2+Q3
± 1.000 ± 180.0
VAi=Vi
× Ai
i=1, 3
VA=
3/2(VA1+VA3)
VAi=Vi × Ai
i=1, 2, 3
VA=
VA1+VA2+VA3
VAi=Vi × Ai
i=1, 2
VA=VA1+VA2
Q= (VA)
2
—P
2
VAi=Vi
× Ai
i=1, 3
VA=
3/2(VA1+VA3)
VA = VA
3 φ 3W3i
3 φ 4W
Calculation
range –1 to +1 –180 to +180
Display
resolution
P
P
With reactive
power meter
P / VA
Without reactive
power meter
cos
–1
(P / VA)
With reactive
power meter
Without reactive
power meter
The ratings depend
on the ranges for V
and A.
Same as for active
power.
The ratings depend
on the ranges
for V and A.
Same as for
active powaer
P
/
P
2 +
Q
2
cos
-1
(P
/
P
2 +
Q
2
)
Reactive power
(without reactive
power meter method)
Apparent power Power factor Phase angle
With reactive
power meter With reactive
power meter
Without reactive
power meter
P
/
VA
Without reactive
power meter
cos
–1
( P
/
VA)
( P)
2
+( Q)
2
19.1 Specifications