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Gx
Series
EN - 162
13.15. CALCULATION OF POWERS AND POWER FACTORS
Single phase mode
The instrument measures the values of RMS Voltage and RMS Current and calculates the
average Power values for each period. The formulas for power calculation are:
N
i
i
i
i
v
N
P
1
1
N
i
i
N
i
i
i
N
v
N
S
1
2
1
2
1
1
2
2
P
S
Q
S
P
Pf
where:
N = number of samples in the period
Three phase balanced mode
The instrument measures the values of RMS Voltage between L1 and L2 phases and
RMS Current on L3 phase and calculates the average Power values for each period. The
formulas for power calculation are:
N
i
i
i
i
v
N
Q
1
1
3
N
i
i
N
i
i
i
N
v
N
S
1
2
1
2
1
1
3
2
2
Q
S
P
S
P
Pf
where:
N = number of samples in the period