Siemens SENTRON PAC4200, Manual, Page: 39 / 252

Description
3.6 Technical features of the supply quality
SENTRON PAC4200
Manual, 09/2008, A5E02316180B-01
39
Phase angles
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 a-a, a-
b, and a-c.
The values can be called via the communication interfaces.
The display represents the instantaneous value of the phase angle on several screens:
●
Phasor diagram,
can be called with "MAIN MENU" > "PHASOR DIAGRAM"
● Value table of the phasor diagram, row
V"
can be called with "MAIN MENU" > "PHASOR DIAGRAM" > F1
Figure 3-10 Phasor diagram, value table
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.
The display represents the unbalance information on several screens:
●
"PHASE UNBAL.", current and voltage unbalance in percent
● PHASOR DIAGRAM, absolute values of the current, voltage, and phase angle " V" for
each phase
Figure 3-11 Voltage and current unbalance
In addition to the vectorial calculation of the phase unbalance, SENTRON PAC4200 also
supplies the amplitude unbalance for current and voltage according to the IEC 61557-12
standard at the communication interfaces. The amplitude unbalance only takes account of
the amplitude and not the phase angle.