ABB RELION REB500 Operation Manual page 68

Section 7
Additional functions
IEC18000334 V1 EN-US
Figure 29: Trip redirection
For BFP, an additional function has been included: When the input Trip transferred is active,
the breaker failure delays (t1 and t2) are reduced to their minimum (10 ms). The operating
sequence for the example of a line fault is: The input signal 11105_External TRIP is not needed
in this example.
1. The gas pressure is too low and the circuit-breaker operation is blocked and the signal
Trip transferred is sent to REB500.
2. A fault occurs on the line.
3. The line protection detects the fault and sends simultaneous signals to trip the circuit-
breaker and start BFP.
4. Since the circuit-breaker is blocked, it cannot respond.
5. The overcurrent criterion and therefore the starting conditions for BFP are fulfilled.
6. As the input Trip transferred has set the delays t1 and t2 to 10 ms, BFP intertripping of the
local circuit-breakers and transfer tripping of remote circuit-breakers.
7. REB500 thus issues a tripping command to the surrounding circuit-breakers after about
20 ms to isolate the fault.
The input signal 11105_External TRIP is not needed in this example.
62
13605_Trip redirection_1
13606_Trip redirection_2
I I > setting
L1 L1
I I > setting
L2 L2
I I > setting
L3 L3
BFP Trip (internal)
OCDT Trip (internal)
PDF Trip (internal)
11105_EXT. TRIP
BBP Trip (internal)
13610_BP Trip transfer
If the BFP function is not available (not released during the engineering phase)
the trip redirection function is also not available. As a result the signal
13605_Trip redirection _1 and 13606_Trip redirection_2 cannot be selected in
the list of binary input signals.
The trip redirection function is connected with the timing of the BFP function.
Since the external tripping commands are connected to BFP starting inputs,
the input signal 11105_EXT.TRIP is then not needed, because the BFP starting
signals perform this function.
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14000024-IEC18000334-1-en.vsd
Distributed busbar protection REB500
1MRK 505 400-UEN B
23110_BFP Remote Trip
23335_Trip by BFP
Intertrip (CU)
Technical manual