Siemens SENTRON PAC5100, Device Manual, Page: 33 / 266

4 Measurands and Recording
4.1 Measuring and Recording System
33 SENTRON PAC5100/5200, 7KM5212/5412, Device Manual
E50417-H1040-C568-A1, Edition 03.2015
4.1.2.2 Measurement Recorder
In addition to measured values used to determine the power quality, the Measurement recorder also records a
number of other measured values (for example min/max values). Recording of the following measurands can
be parameterized via the user interface:
• PQ measurands to determine the power quality:

Frequency averaging intervals (fixed to 10 s)

Averaging intervals for voltage, voltage unbalance, and harmonics (30 s, 1 min, 10 min, 15 min,
30 min, 1 h, 2 h)

Flicker (Pst, determined over 10 min; Plt, 12 Pst values over 2 h)
• Power/THDS measurands: current, current unbalance, active power, apparent power, reactive power,
THDS of voltage, THDS of current, power factor, active power factor, phase angle
• Recording of the minimum values (mean values)
• Recording of the maximum values (mean values)
Figure 4-4 Functioning of the Measurement Recorder, Frequency Measurement (PQ Value)
The measuring interval can be set in various increments from 30 s to 2 h. All measurands except for the
frequency thus have a common time basis. For flicker the time base is adjusted tightly. The measuring interval
for frequency measurement is permanently set to 10 s. Several of the measurands are optional. For more
detailed information, see Chapter 4.2.
Frequency Limit value frequency
49.4
49.5
49.6
49.7
49.8
49.9
50.0
50.1
50.2
50.3
50.4
50.5
50.6
Hz
0:00:00 0:00:30 0:01:00 0:01:30
t (h:m:s)
Legend