46
IM CW500-02EN
Reactive power Q [Var]
Range
Same as active power
Display digits
Same as active power
Accuracy
Computed value from each measured value ± 1 dgt (the
total value is ±3 dgt)
Sign
Minus sign: Leading phase (current phase relative to the
voltage)
Plus sign (no sign): Lagging phase ( ” )
For the polarity sign, the harmonic reactive power is
determined for each measurement channel, and a sign
opposite to the fundamental waveform is attached.
Equation
Q
c
=
2
2
c
c
P
S
sign
−
sign
: polarity sign,
c: measurement channel
1P2W-1 to 4
Q
1
,
Q
2
,
Q
3
,
Q
4
,
Q
sum
=
Q
1
+Q
2
+Q
3
+Q
4
1P3W(3P3W)
-1 to 2
Q
1
,
Q
2
,
Q
sum1
=
Q
1
+Q
2
Q
3
,
Q
4
,
Q
sum2
=
Q
3
+Q
4
Q
sum
=
Q
sum1
+Q
sum2
3P3W3A(3P4W)
Q
1
,
Q
2
,
Q
3
,
Q
sum
=
Q
1
+Q
2
+Q
3
Power factor PF
Display range
–1.000 to 0.000 to 1.000
Accuracy
Computed value from each measured value ± 1 dgt (the total
value is ±3 dgt)
Sign
Minus sign:
Leading phase
Plus sign (no sign): Lagging phase
*
For the polarity sign, the harmonic reactive power is
determined for each measurement channel, and a sign
opposite to the fundamental waveform is attached.
Equation
c
c
c
S
P
sign
PF
=
sign: polarity sign,
c: measurement channel,
1P2W-1 to 4
PF
1
,
PF
2
,
PF
3
,
PF
4
,
PF
sum
1P3W(3P3W)
-1 to 2
PF
1
,
PF
2
,
PF
sum1
PF
3
,
PF
4
,
PF
sum2
PF
sum
3P3W3A(3P4W)
PF
1
,
PF
2
,
PF
3
,
PF
sum
Specifications