If you set the 3I0 criterion parameter to Direct release, you prevent the plausibility check of the
zero-sequence current. In this way, a pickup only by way of this current can be achieved. With the Threshold
3I0 dir. release parameter, you set the threshold value to be exceeded.
If you set the I2 criterion parameter to Direct release, you also switch off the plausibility check of
the negative-sequence current. With the Threshold I2 dir. release parameter, you set the threshold
value to be exceeded.
If you set the I2 criterion parameter to Direct release, plausibility is checked via the phase currents
with 1/3 * Threshold I2 dir. release.
The measuring algorithm is optimized for fast dropout when the value drops below the threshold value.
[lostrom1-030211-01.tif, 4, en_US]
Figure 6-252
Current-Flow Criterion
Protection and Automation Functions
6.41 Circuit-Breaker Failure Protection
840 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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