Extern Shots Sub-Menu - Siemens 7SR224 Description & Operation

(1) Description of Operation 7SR224
4.1.7

EXTERN SHOTS sub-menu

This menu allows the External Protection auto-reclose sequence to be parameterized:-
79 P/F Prot'n Trip1
79 P/F Deadtime 1
79 P/F Prot'n Trip2
79 P/F Deadtime 2
79 P/F Prot'n Trip3
79 P/F Deadtime 3
79 P/F Prot'n Trip4
79 P/F Deadtime 4
79 P/F Prot'n Trip5
79 P/F Extern Trips to Lockout - Sets the number of allowed External protection' trips, Relay will go
These settings allow the user to set-up a separate AutoReclose sequence for external protection(s)
having a different sequence to P/F, E/F or SEF protections. The ' Blocked ' setting allows the
Autoreclose sequence to raise an output at any point in the sequence to Block further Trips by the
External Protection thus allowing the Overcurrent P/F or Earth Fault or SEF elements to apply
Overcurrent Grading to clear the fault.
Other Protection Elements in the Relay can also be the cause of trips and it may be that AutoReclose
is required; the External AutoReclose sequence can be applied for this purpose. By setting-up internal
Quick Logic equation(s) the user can define and set what should occur when any one of these other
elements operates.
Note: If the 'CB Total Trip Count' or the 'CB Frequent Ops Count' target is reached the relay will do
one delayed tip and lockout*.
*NB: If Delayed Trips are not assigned in the AUTORECLOSE PROT'N menu the relay will not trip.
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Not Blocked/Blocked - Blocked raises an output which can be mapped to a
Binary output to Block an External Protection's Trip Output.
Sets the first Reclose Delay ( Deadtime) for the External sequence.
Not Blocked/Blocked - Blocked raises an output which can be mapped to a
Binary Output to Block an External Protection's second Trip output.
Sets the second Reclose Delay ( Deadtime) in the External sequence.
Not Blocked/Blocked - Blocked raises an output which can be mapped to a
Binary output to Block an External Protection's third Trip Output.
Sets the third Reclose Delay (Deadtime) in the External sequence.
Not Blocked/Blocked - Blocked raises an output which can be mapped to a
Binary output to Block an External Protection's fourth Trip Output.
Sets the fourth Reclose Delay (Deadtime) in the External sequence.
Not Blocked/Blocked - Blocked raises an output which can be mapped to a
Binary output to Block an External Protection's fifth Trip Output.
to Lockout on the last Trip.
©2009 Siemens Protection Devices Limited