Application And Setting Notes - Siemens 7SR51 Device Manual

Control Functions
7.3 79 Automatic Reclosing

Application and Setting Notes

7.3.4
Parameter: 79 Common > Autoreclose
•
Default setting: Disabled
The autoreclose feature can be switched in and out of service.
This can also be achieved by mapping of binary input or user logic or as a control function from the fascia
menu or communications protocols.
Parameter: 79 Common > Number of Shots
•
Default setting: 1
The number of shots (Closes) is user programmable. The controller selects the next protection character-
istic/dead time according to the type of the last trip in the sequence e.g. PF, EF, SEF or external.
NOTE
i
i
Only one shot counter is used to advance the sequence.
Parameter: 79 Common > Retry Enable
•
Default setting: Disabled
When enabled the relay will perform further attempts to automatically close the circuit‑breaker where the
CB has initially failed to close in response to a close command.
If the first attempt fails the relay will wait for the 79 Retry Interval to expire then attempt to close
the CB again.
Parameter: 79 Common > Retry Attempts
•
Default setting: 1
When enabled the relay will perform further attempts to automatically close the circuit‑breaker where the
CB has initially failed to close in response to a close command.
If the first attempt fails the relay will wait for the 79 Retry Interval to expire then attempt to close
the CB again.
Parameter: 79 Common > Retry Interval
•
Default setting: 60 s
When enabled the relay will perform further attempts to automatically close the circuit‑breaker where the
CB has initially failed to close in response to a close command.
If the first attempt fails the relay will wait for the 79 Retry Interval to expire then attempt to close
the CB again.
Parameter: 79 Common > Reclose Blocked Delay
•
Default setting: 60 s
If the CB is not ready to receive a close command or if system conditions are such that the CB should not
be closed immediately e.g. a close-spring is not charged, then a binary input mapped to Reclose
Block can be raised and the close pulse will not be issued but will be held-back. The Reclose
Blocked Delay sets the time that the Reclose Block is allowed to be raised, if this time delay
expires the relay will go to Lockout. If Reclose Block is cleared, before this time expires, then the CB
close pulse will be issued at that point in time. Dead time + Reclose Blocked Delay = Lockout.
426 Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019