Siemens SENTRON PAC4220 - Page 33

The PAC4220 measures the THD of the voltage and the THD of the current referred to
the fundament
al. 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.
The PAC4220 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 communications interfaces.
Cosine φ
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.
The PAC4220 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 communications 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
The PAC4220 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 communications interfaces.
Unbalance
A 3-phase system is referred to as balanced if the 3 phase-to-phase voltages and phase-to-phase
currents have an identical amplitude and are o󹪜set 120° from each other.
The PAC4220 calculates the unbalance for voltage and current according to the
EN61000‑4‑27:2000 standard.
Description
2.6Technical features of the network quality
PAC4220
Equipment Manual, L1V30827278B-01 31