Stage Description
Logic of a Stage
[louvpuxx-100611-01.tif, 1, en_US]
Figure 7-155
Logic Diagram of a Stage: Undervoltage Protection with Any Voltage
NOTE
If the function Undervoltage protection with any voltage is used in a 1-phase function group, the param-
eter Measured value is not visible.
Method of Measurement
The Method of measurement parameter allows you to define whether the function works with the funda-
mental component or the calculated RMS value.
•
Measurement of the fundamental component:
This method of measurement processes the sampled voltage values and filters out the fundamental
component numerically.
•
Measurement of the RMS value:
This method of measurement determines the voltage amplitude from the sampled values according to
the defining equation of the RMS value. Harmonics are included in the analysis.
7.17.3
Protection and Automation Functions
7.17 Undervoltage Protection with Any Voltage
SIPROTEC 5, High-Voltage Bay Controller, Manual 819
C53000-G5040-C015-9, Edition 11.2017
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