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7SR11 & 7SR12 Description Of Operation
79 P/F Extern Trips to Lockout - Sets the number of allowed External protection' trips, Relay will go to Lockout
on the last Trip.
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.
©2012 Siemens Protection Devices Limited
Chapter 1 Page 57 of 76
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