Siemens 7SR51 Device Manual page 428

Control Functions
7.3 79 Automatic Reclosing
Parameter: 79 PF > PF Triggers
•
Default setting: <all>
Parameter: 79 PF > PF Trips to LO Target
•
Default setting: 5
Parameter: 79 PF > PF Deadtime 1
•
Default setting: 5 s
Sets the first reclose delay (Dead time) in the P/F sequence.
The autoreclose will remain in this state for the appropriate deadtime setting time. The setting applied
depends on the fault type defined by the autoreclose trigger mapping for the protection element that
tripped and the current autoreclose shot number. If a further protection trip occurs during the deadtime
the autoreclose will increment the shot number then return to Sequence in Progress, wait for the
trip to reset before starting the next dead time. When the dead time time setting expires, the autoreclose
progresses to Close Inhibit. The dead time is initiated when the trip output contact reset, the pickup
is reset and the CB is open. The CB close output relay is energized after the dead time has elapsed.
[dw_7SR5_function79ApplicationAndSettingNotes2, 1, en_US]
Figure 7-9
Parameter: 79 PF > PF Protection Trip 1
•
Default setting: Inst
Each autoreclose attempt (autoreclose shot) is defined as being either a delayed trip or an inst trip. These
settings types are used in advanced schemes.
Parameter: 79 PF > PF HS Trips
•
Default setting: <none>
Parameter: 79 PF > PF Delayed Trips
•
Default setting: <none>
428
Typical AR Sequence with 3 Inst and 1 Delayed trip
Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019