ABB Switzerland Ltd REG 316*4 1MRB520049-Uen / Rev. F
3-286
E. Setting instructions
Settings:
Pick-up current setting: I Setting
Tripping delay: Delay t1
Delay t2
Delay tEFP
Rest delay: t Drop Retrip
t Drop BuTrip
Impulse: t Puls RemTrip
Enabled signals: t1 active
t2 active
RemTrip active
EFP active
Red active
Start Ext active.
Pick-up current setting “I Setting”
If the BFP current detector pick-up setting is too low, there is a
possibility that the detectors may reset too late after it has suc-
cessfully tripped the circuit-breaker. This can be caused by
damped oscillations on the secondary side of the c.t.
On the other hand, if the setting is too high, the BFP may fail to
operate at all should, for example, the current fall below pick-up
again due to severe c.t. saturation. A typical setting for the pick-
up current is just below the minimum fault current that can occur
on the respective line.
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