ABB REB500 - Page 64

Section 6 1MRK 505 350-UEN
Additional functions
56 Technical Manual
Distributed busbar protection REB500
The overcurrent release (low current check feature) is used to enable tripping and
intertripping commands generated by the BBP, BFP and EFP and/or trip
redirection (configurable). If the measured feeder current lies below the pick-up
setting of the overcurrent release, tripping of the particular feeder is prevented.
Figure 24 Principle of the overcurrent release function
Although in the event of a busbar trip and feeder current not exceeding the pick-up
of the low current check feature the feeder concerned is not tripped, a trip event is
generated by the central unit and displayed on its (see Section 3.7.3. “Intertripping/
transfer tripping”).
The current pick-up setting can also be used for trip redirection regardless of
whether the low current check feature is configured or not.
Parameter Min. Max. Default Step Unit
Overcurrent release active
inactive
Pick
-
up setting when active
0.1
4.0
0.7
0.1
IN
The overcurrent release function is processed independently of the release logic.