[loinru05-240211-01.tif, 1, en_US]
Figure 6-84 Logic of the CWA-Method Function (T = 1 Period)
Logic of the Inrush-Current Detection
The following logic diagram shows the link of the 2 methods of measurement Harmonic Analysis and CWA
method.
The crossblock function influences the Harmonic Analysis process. If you have set the parameter Cross-
blocking to yes, you will receive in the event of threshold-value violation a blocking indication for all 3
phase currents and the measured or calculated zero-sequence current (l
2nd harm
/ l
1st harm
). The crossblock func-
tion works via a timer. Set parameters for the time depending on the expected duration factor via the param-
eter Crossblocking time.
If the phase current exceeds the maximum permissible current Operat.-range limit Imax, the inrush-
current detection will be blocked.
Protection and Automation Functions
6.8 Inrush-Current Detection
SIPROTEC 5, Overcurrent Protection, Manual 489
C53000-G5040-C017-8, Edition 07.2017
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