ABB REB500 - Configuration

1MRK 505 350-UEN Section 5
Additional protection options
Technical Manual 39
Distributed busbar protection REB500
5.1.2 Configuration
BFP has two adjustable timers. At the end of time t
1
, a second attempt is made to
trip the breaker that has failed to trip; at the end of time t
2
the surrounding breakers
are tripped. A transfer-tripping signal to the remote station generated either at the
end of time t
1
or t
2
can also be enabled using HMI500.
The currents of the three phases are measured individually and compared with the
pick-up setting, which is identical for the three phases.
Since there are three separate t
1
timers for the individual phases, the REB500 BFP
responds correctly to an evolving fault.
Logic 4 can be used in stations with 2 redundant REB500 units, one for busbar and
the other for breaker failure protection. In this case, the special inputs “13760_Start
BFP L1L2L3_5” and “13765_Start BFP L1L2L3_6” on the REB500 for BFP are
used to instantly initiate intertripping after t
1
independently of the time setting of t
2
.
The following breaker failure parameters can be set using HMI500:
Table 32 Parameters for setting BFP
Parameter Min. Max. Default Step Unit
BFP active
inactive
Setting
(per current transformer)
0.1
2.0
1.2
0.1
I
N
Timer 1 active
active
Timer 2 active
active
Timer t
1
10
5000
100
10
ms
Timer t
2
0
5000
12
0
10
ms
Intertripping pulse duration
10
5
000
1
00
10
ms
Logic type
1
4
1
1