2857-570/024-001
Functions
Product manual | Version: 2.0.0
31
3-Phase Power Measurement Module, 1 A
Table 24: Measured Value Overview – Total
Measured Value
4-wire threephase
network
3-wire threephase
network (ARON)
3-wire threephase
network
2-wire network (sin-
gle phase network)
Active Power Total
X
X
X
X
Reactive Power Total
X
X
X
X
Apparent Power To-
tal
X
–
X
X
Rotary field
X
X
X
X
Power Factor PF To-
tal
–/X
1)
–
–/X
1)
–/X
1)
1)
FW Version 2.0.0.
Note
Please note the correlation between Upper Harmonic and Harmonic
“First harmonic” refers to the vibration at the fundamental frequency (fundamental compo-
nent), and “first upper harmonic” refers the vibration at twice the fundamental frequency.
Therefore, in general, the nth harmonic corresponds to the n−1st upper harmonic.
4.3 Description of Measured Values
Calculation of Current and Voltage
The product calculates the
true RMS value
for the voltage and current per period applied
at the measurement inputs. See figure below.
å
=
=
N-1
0
k
2
k
N
1
eff
i
I
å
=
=
N-1
0
k
2
k
N
1
eff
u
U
Figure 13:
• i
k
: Sampling value of current
• u
k
: Sampling value of voltage
• I
eff
: RMS of current
• U
eff
: RMS of voltage
• N: Number of sampling values