ABB RELION REB500 Operation Manual page 52

Section 6
Additional protection options
Timer stage t2 is implemented as a single timer and can be initiated after t1 by both phase and
neutral system. The simplified block diagram can be seen in
The behavior of timer stage t2 is the same as for the phase-system. Remote tripping signals
can be set after the end of timers for stage t1 or at the end of t2.
Legend:
Note: This is a very simplified representation
which does not include any parameters or
possible setting combinations.
IEC18000301 V1 EN-US
Figure 13:
Table 34: Parameters for the BFP L0 system
Parameter
Active for L0
Pick-up setting
I0 calculated
Connect phase start signals
Timer t1-L0
46
t1 L0 Initiation
t1 L1 Initiation
t1 L2 Initiation
t1 L3 Initiation
t1 external Initiation
Referenced Internal Signals
Simplified block diagram of the BFP Initiation logic
Min.
0.05
10
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Timers t1
t 0
t 0
t 0
≥1
t 0
t 0
12000172-IEC18000301-1-en.vsd
Max. Default
inactive
2.00 1.2
inactive
active
5000 100
1MRK 505 400-UEN B
Figure 10.
Timer t2
t 0
Step Unit
0.05 I
N
10 ms
Distributed busbar protection REB500
Technical manual