Stage Description - Siemens 6MD85 Manual

Protection and Automation Functions
7.15 Overvoltage Protection with Any Voltage

Stage Description

7.15.3
Logic of a Stage
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Figure 7-147
NOTE
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If the function Overvoltage 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 comp.:
This method of measurement processes the sampled voltage values and filters out the fundamental
component numerically.
•
Measurement of the parameter value 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.
Measured Value
The parameter Measured value allows you to select whether the stage uses a measured (directly
connected) voltage or a calculated phase-to-phase voltage.
If the function Overvoltage protection with any voltage is used in a 1-phase function group, the parameter
Measured value is not visible.
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Logic Diagram of a Stage: Overvoltage Protection with Any Voltage
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017