[loocp3p1-310511-01.tif, 4, en_US]
Figure 6-10
Logic Diagram of the Definite-Time Overcurrent Protection (Phases) – 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.
RMS-Value Selection (Advanced Stage)
If RMS value is selected as the method of measurement, the protection function supports 2 kinds of RMS
measurement.
•
Normal RMS value
•
Gained RMS value from the function block Filter
Protection and Automation Functions
6.3 Overcurrent Protection, Phases
330 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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