Section 4 1MAC309294-MB F
Protection functions
242 RER620
Technical Manual
Figure 112: Typical breaker failure protection scheme in distribution substations
4.5.1.6 Signals
Table 251: 50BFT Input signals
Table 252: 50BFT Output signals
Name Type Default Description
I_A SIGNAL 0 Phase A current
I_B SIGNAL 0 Phase B current
I_C SIGNAL 0 Phase C current
I_N SIGNAL 0 Ground current
BLOCK BOOLEAN 0=False Block CBFP operation
START_A BOOLEAN 0=False Phase A CBFP pickup command
START_B BOOLEAN 0=False Phase B CBFP pickup command
START_C BOOLEAN 0=False Phase C CBFP pickup command
POSCLOSE_A BOOLEAN 0=False CB Phase A in closed position
POSCLOSE_B BOOLEAN 0=False CB Phase B in closed position
POSCLOSE_C BOOLEAN 0=False CB Phase C in closed position
CB_FAULT BOOLEAN 0=False CB faulty and unable to trip
Name Type Description
CB_FAULT_AL BOOLEAN Delayed CB failure alarm
TRBU BOOLEAN Backup trip
TRBU_A BOOLEAN Phase A Backup trip
TRBU_B BOOLEAN Phase B Backup trip
TRBU_C BOOLEAN Phase C Backup trip
TRRET BOOLEAN Retrip
TRRET_A BOOLEAN Phase A Retrip
TRRET_B BOOLEAN Phase B Retrip
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