Configuration Or Current Setting Of Bfp L0 System - ABB RELION REB500 Operation Manual

1MRK 505 400-UEN B
The BFP L0 system is an integrated part in the conventional BFP function that can be activated
and configured separately.
The neutral measuring system of BFP for I0 covers the ground potential as a fourth phase and
evaluates breaker failure conditions accordingly. To allow for individual fault handling,
separate configuration for the I0 threshold and timer stage t1 is possible.
When activated, the function is completely integrated into the existing BFP function. With the
exceptions mentioned above, both timer t2 and the intertripping system are used by the BFP
phase and L0 system.
Figure 12
with the L0 system.
Active for L0
3I0 calculated
I
L0
Σ
I
I
I
13797_BP_Start BFP L0
Legend:
IEC18000300 V1 EN-US
Figure 12:
When enabled, the L0 system of BFP can be started by dedicated logical starting signals.
Logical starting signals of the BFP phase system can be connected to the BFP L0 system by
enabling the parameter
When connecting phase start signals to the BFP L0 system, functions depending on single
phase tripping signals such as autoreclosure might be bypassed by a three-phase trip after
BFP L0-t1.
6.2.2

Configuration or current setting of BFP L0 system

Similar to the conventional BFP for the phase system, the BFP L0 system works with two timer
stages. To allow for independent fault clearance behavior, timer stage t1-L0 is implemented as
a completely separate timer, independent from the timer stages t1 of the BFP phase system.
Distributed busbar protection REB500
Technical manual
shows a simplified representation of an extension of the conventional BFP system
I > setting
L0
I > setting
L1 L1
I > setting
L2 L2
I > setting
L3 L3
Connect phase start signals
Start L1 signals
Start L2 signals
Start L3 signals
Start L1L2L3 signals
13795_Start BFP L0_1
13796_Start BFP L0_2
≥1
Trip/Intertrip, OCDT, PDF, ext. Trip
Referenced Internal Signals
Referenced Parameters
Simplified block diagram of the BFP L0 system
Connect phase start signals (see
To avoid bypassing of the conventional BFP, timer t1 of the BFP L0 system will
only be initiated by start signals for the phase system if each of the
independent phase currents is below the setting for the phase system.
The signal 23340_BFP TRIP L0 by itself does not allow for phase segregated
tripping and therefore normally be used for three-phase-tripping of the circuit
breaker.
© Copyright 2019 ABB. All rights reserved
Timer t1-L0
t
&
≥1
&
≥1
&
≥1
Section
Additional protection options
0
23340_BFP TRIP L0
BFP t1 trip signals
BFP t2 initiation
12000171-IEC18000300-1-en.vsd
6.2.2).
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Section 6
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