4 Measurands and Recording
4.1 Measuring and Recording System
38 SICAM P850/P855, 7KG85xx, Device Manual
E50417-H1040-C482-A6, Edition 10.2018
4.1.2.3 Trend Recorder (Only SICAM P855)
The trend recorder ensures the acquisition and long-term monitoring of the voltage V
rms
(1/2) during voltage
changes. If a change of the measured value compared to the RMS value recorded last occurs during the
parameterized measuring interval, which exceeds or falls below the tolerance limit, this new RMS value will be
recorded.
Figure 4-5 Functioning of the Trend Recorder, Voltage Interruption
Once the measuring interval has been finished, the next measuring interval starts automatically.
You can set the following parameters via the user interface:
• Tolerance unit (% or numerical)
• Voltage tolerance range (1 % to 5 % referred to the primary nominal voltage)
• Maximum recording interval (10 min to 24 h)
-100
-50
0
50
100
V
0.6 0.7 0.8 0.9 1.0
s
V
rms
(1/2 ) value
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