Logic of the Advanced Stage
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Figure 7-80
Logic Diagram of the Definite-Time Overcurrent Protection (Ground) – Advanced
Method of Measurement (Basic and Advanced Stage)
You use the Method of measurement parameter to define whether the stage uses the fundamental
comp. or the calculated RMS value.
•
Measurement of the fundamental component:
This method of measurement processes the sampled current values and filters out the fundamental
component numerically.
•
Measurement of the RMS value:
This method of measurement determines the current amplitude from the sampled values according to
the defining equation of the RMS value. Harmonics are included in the analysis.
Protection and Automation Functions
7.5 Overcurrent Protection, Ground
SIPROTEC 5, High-Voltage Bay Controller, Manual 639
C53000-G5040-C015-9, Edition 11.2017
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