Hioki PW3360-20 - Page 211

12.5 Calculation Formulas
203
Chapter 12 Specifications
12
* Subscript c: measurement channel
Apparent power
Wiring
setting
Item
Single-phase
2 wire
Single-phase
3 wire
Three-phase
3 wire
Three-
phase
4 wire
1P2W 1P3W 1P3W1U 3P3W2M 3P3W3M 3P4W
Apparent
power 
S [VA]
S
1
S
1
S
2
S
1
S
2
= U
1
×I
2
S
1
S
2
S
3
S
1
= u
1
×I
1
S
2
= u
2
×I
2
S
3
= u
3
×I
3
S
1
S
2
S
3
PF/Q/S (RMS cal-
culation)
S
c
=U
c
×I
c
S=S
1
+S
2
S= S=
S=S
1
+S
2
+S
3
• The phase voltage is used to calculate S
1
, S
2
, and S
3
for 3P3W3M connections. The line-to-
line voltage is used to calculate total S.
S
1
S
1
S
2
S
1
S
2
S
3
PF/Q/S (funda-
mental wave cal-
culation)
S
c
=
S=
• This reactive power S is defined as the f
undamental wave reactive power.
• (1): Harmonic calculation fundamental wave (1st order)
3
3
-------
S
1
S
2
S
3
++
3
3
-------
U
1
I
1
U
2
I
2
U
3
I
3
++
P
c1
2
Q
c1
2
+
P
1
2
Q
1
2
+
Power factor, Displacement power factor
Wiring
setting
Item
Single-phase
2 wire
Single-phase
3 wire
Three-phase
3 wire
Three-
phase
4 wire
1P2W 1P3W 1P3W1U 3P3W2M 3P3W3M 3P4W
Power 
factor 
PF
PF/Q/S
(
RMS cal-
culation
)
PF
1
PF
1
PF
2
PF
1
PF
2
PF
3
PF
c
=si
PF= si
• The component si indicates lag and lead. The sign of reacti
ve power Q (fundamental wave
reactive power) is used.
Positive sign: Lag [Display indicates LAG, and output data is positive.]
Negative sign: Lead [Display indicates LEAD, and output data is negative.]
• When S < |P| due to the effects of measurement error, unbalance, or other factors, S = |P|
and PF
= 1.
• When S = 0, PF is determined as invalid data.
P
c
S
c
------
P
S
---