Hioki PW3335 - Page 167

5.5 Calculation Formulas Specifications
161
(3) Power calculation formulas
Item (RECTIFIER) Calculation formulas
Active power
(AC+DC, AC+DC Umn)
Active power simple average value
(DC)
Active power AC component (AC)
Fundamental wave active power
(FND)
P
1
from harmonic calculation formula
Apparent power
(AC+DC, AC, AC+DC Umn)
Calculated values from the respective rectifiers are used for
U and I.
(For AC+DC Umn, the AC+DC value is used for current.)
Fundamental wave apparent power
(FND)
S
1
from harmonic calculation formula
Reactive power
(AC+DC, AC, AC+DC Umn)
Calculated values from the respective rectifiers are used for P and S.
Fundamental wave reactive power
(FND)
Q
1
from harmonic calculation formula
Power factor
(AC+DC, AC, AC+DC Umn)
Calculated values from the respective rectifiers are used for P and S.
Fundamental wave power factor
(FND)
λ
1
from harmonic calculation formula
Phase angle (AC)
Calculated values from the respective rectifiers are used for
λ .
Fundamental wave voltage current
phase difference (FND)
M: Number of samples between synchronized timing points; s: Number of sample points;
si: Polarity symbol, acquired based on voltage waveform and current waveform lead and lag
Symbol [None]:Current lags voltage (LAG).
Symbol [-]: Current leads voltage (LEAD).
∑
1M－
0=s
ss
)×(
M
1
= iuP
DCDCDC
×= IUP
DCAC
= PPP －
IUS ×=
22
= PSQ
si
－
S
P
λ
si
=
)° 90± °0( ～
λφ
1
si
cos=
－
When P
AC
≥ 0
)° 180± °90±( ～
－
－
λφ
1
si
cos180=
When P
AC
< 0
from harmonic calculation formula
1
φ