Description
3.6 Technical features of the supply quality
SENTRON PAC4200
System Manual, 09/2009, A5E02316180B-02
41
Harmonics referred to the root-mean-square value
The fundamental of the voltage is specified in volts (V) rather than percent (%). The
harmonics of the voltage referred to the root-mean-square value (r.m.s.) can be calculated
from this information in the software.
THD
The THD (total harmonic distortion) is used to describe the distortion of the electrical signal.
It indicates the ratio of the harmonic content to the fundamental in percent.
SENTRON PAC4200 measures the THD of the voltage and the THD of the current referred
to the fundamental. The instantaneous value, the maximum value and the time stamp of the
maximum value are supplied.
The values are calculated according to the IEC 61557-12 standard: 2007. Account is taken
of harmonics up to the 31st harmonic.
Displacement angle φ
The angle φ (phi) describes the displacement angle between the fundamentals of voltage
and current.
SENTRON PAC4200 supplies the instantaneous value of the displacement angle φ, the
maximum and minimum values, and the time stamps of the maximum and minimum values
for each phase.
The values can be read out via the communication interfaces.
The display represents the phase displacement on several screens:
●
Phasor diagram,
can be called with "MAIN MENU" > "PHASOR DIAGRAM"
●
Value table of the phasor diagram, row
φ"
can be called with "MAIN MENU" > "PHASOR DIAGRAM" > F1
●
Display "
φ",
can be called with "MAIN MENU" > "COSφ/
φ" > F1 > F1 > F1
Figure 3-6
Graph of the phasor diagram
Figure 3-7
Minimum value of the displacement angle φ with time stamp
