Siemens SENTRON PAC4200 Manual page 33

Description
2.6 Technical features of the network quality
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 in accordance with standard IEC 61557-12: 2007. Harmonics up
to the 64th harmonic are taken into account.
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.
Cosine phi
Cos φ is the cosine of the displacement angle φ of the fundamentals for voltage and current.
The possible values of cos φ are between -1 and 1.
SENTRON PAC4200 supplies the instantaneous value of cos φ, the maximum and minimum
values, and the time stamps of the maximum and minimum time values for each phase.
The values can be read out via the communication interfaces.
An inductive cos φ is marked by a coil symbol in front of the measured value and a
capacitive cos φ by a capacitor symbol.
Phase angle U
SENTRON PAC4200 supplies the instantaneous values, the maximum and minimum values,
and the time stamps of the maximum and minimum time values for the phase angles L1-L1,
L1-L2 and L1-L3.
The values can be called via the communication interfaces.
Unbalance
A three-phase system is referred to as balanced if the three phase-to-phase voltages and
phase-to-phase currents have an identical amplitude and are offset 120° from each other.
SENTRON PAC4200 calculates the unbalance for voltage and current according to the
EN 61000-4-27:2000 standard.
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System Manual, 05/2019, A5E02316180B-05
PAC4200