The evolving-fault detection is divided into components:
•
Detection of Evolving Faults
•
Evolving-Faults Processing
•
3-pole circuit-breaker intertripping during evolving faults
The procedure during evolving faults is illustrated in Figure 6-309.
Detection of Evolving Faults
For the detection of an evolving fault, the following criteria can be selected through parameters:
•
Parameter Evolving-fault detection = with trip
For this setting, any tripping during the dead time leads to evolving-fault detection. At any tripping it is
decided if an internal protection function is tripped or if the tripping is signaled through a binary input.
Thus, it does not matter if the tripping-protection function is configured for the start of the automatic
reclosing function or not.
•
Parameter Evolving-fault detection = with pickup
Evolving faults are detected if during the dead time a protection function configured for the automatic
reclosing function start is picked up or if an external pickup is recognized through a binary input.
•
Binary input
>Evolving fault start
The evolving-fault detection can also be introduced through a binary input without an internal protection
pickup being available.
Reaction to Evolving Faults
After a recognized evolving fault, the automatic reclosing function can be influenced in 2 ways.
•
Parameter Response to evolv. faults = blocks 79
As soon as an evolving fault is recognized, the reclosing function will be blocked. There are no other
reclosing attempts and the automatic reclosing function is blocked until the pickup and operate indica-
tions causing the evolving fault disappear.
•
Parameter Response to evolv. faults = strt. evol.flt.dead time
As soon as an evolving fault is recognized, an automatic reclosing cycle for 3-pole interruption is
switched to. The automatic reclosing function does not allow any 1-pole tripping until the fault is solved
or there is a final switch off; thus, every following trip command will be 3-pole. When the evolving fault is
fixed, the separate dead time for faults will start, see also chapter Dead time. The further process is as by
3-pole cycles.
[dwbspffe-100611-01.tif, 1, en_US]
Figure 6-309 Cyclic Automatic Reclosing Function - Example for an Evolving Fault
For tripping through evolving faults, the entire dead time consists of the part of the dead time expired until
disconnecting the evolving fault for the 1-pole interruption plus the dead time for the fault together, see
Figure 6-310.
The dead time for evolving faults is started with the return of the operate indication or with the opening of all
3 circuit-breaker poles, provided the circuit-breaker auxiliary contacts are connected.
Protection and Automation Functions
6.45 Automatic Reclosing Function
904 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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