As soon as an evolving fault is recognized (see chapter 6.45.4.13 Evolving-Fault Detection During Dead Time),
a separate dead time for faults begins with the stopping of the fault. The total dead time is composed of the
part of the dead time that expired until the evolving fault was stopped for the 1st disruption plus the dead
time for the evolving fault. With the setting of the Dead time aft. evolv. fault to invalid, no
other automatic reclosing cycle is executed after tripping through the evolving fault. The tripping through
evolving faults is then finished.
[lopauare-010611-01.tif, 1, en_US]
Figure 6-308
Cyclic Automatic Reclosing Function - Logic of the Dead Time for the Operating Modes: With
Pickup
Evolving-Fault Detection During Dead Time
Evolving faults are short circuits, which occur after switching off a short circuit during dead time. This may be
the case during 1-pole tripping and there is a short circuit in the non-switched conductors after this.
After 3-pole tripping there may also be evolving faults if the line is fed through a second (non-3-pole) opened
circuit breaker, for example, for systems with a 1 1/2 circuit breaker layout.
6.45.4.13
Protection and Automation Functions
6.45 Automatic Reclosing Function
SIPROTEC 5, Overcurrent Protection, Manual 903
C53000-G5040-C017-8, Edition 07.2017
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