Siemens siprotec 7SA522 User Manual page 290

Functions
6-142
set to ∞. This does not suppress the pick-up annunciations, but merely prevents the
timer from expiring.
The setting parameter ,! 7HOHS%, (address ) determines if it is possible to
use the binary input "!2& ,QVW75,3" to bypass the trip delay times 7 ,SK! (ad-
dress ) and 7 ,! (address ). The binary input (if assigned) is common
to all stages of the overcurrent protection. With ,! 7HOHS%, = <HV it is therefore
determined that the I>–stages trip without time delay following pick-up, if an operate
signal is present at the binary input; if the setting is ,! 7HOHS%, = 1R the set trip
time delays always come into force.
If the I>-stage is to trip when switching the line on to a fault with or without a short de-
lay, 627) 7LPH '(/$< (address , see above and refer to Sub-section "Gener-
al"), the parameter ,! 627) (address ) is set to Yes. We recommend, however,
not to choose the sensitive setting for the switch on to fault function as energyzing of
the line causes a large fault current. It is important to avoid that the selected stage
picks up in a transient way when energizing the line.
7SA522 Manual
C53000-G1176-C119-2