Stage Description
Logic of the Stage
[logisotf-170312-01.tif, 1, en_US]
Figure 6-97
Logic Diagram of the Stage Instantaneous Tripping at Switch onto Fault
Connection of the Stage
The stage is intended to initiate instantaneous tripping when switching onto a fault. To do this, the stage must
be connected to one or more pickups from protection functions or protection stages, for example, to pickup of
an overcurrent-protection stage. That is, the stage of the Instantaneous tripping at switch onto fault func-
tion does not have its own measuring function but requires the pickup of another protection function or
protection stage to pick up.
The stage is active only if switching is pending or executed (for this, see chapter 6.3 Overcurrent Protection,
Phases).
NOTE
If a protection stage picks up and tripping is blocked by the Inrush-current detection function, the Instan-
taneous tripping at switch onto fault function does not pick up. In this case there is no fault recording
either.
Despite this, if a fault recording is necessary, you can activate it with the parameter (_:114) Start
flt.rec of the function Inrush-current detection function (see chapter 6.8 Inrush-Current Detection).
Application and Setting Notes
Parameter: Configuration
•
Default setting (_:5941:102) Configuration = no stage
6.11.3
6.11.4
Protection and Automation Functions
6.11 Instantaneous Tripping at Switch onto Fault
520 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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