Basler Electric BE1-BPR - Manual (Page 41)

9272000990 Rev J BE1-BPR Application 2-17
Breaker Failure Logic 2 for Enhanced Relays (BFL2E)
BFL2E logic (shown in Figure 2-20) provides the following application features.
1. Three-Pole Tripping BF Logic (Output latch-in provided and Control timer limits operational window)
Three BFI inputs are available at IN3, IN4, and IN5 to start delay timer T1. If the BFI inputs are not
reset by the time Timer 1 times out and either the phase (F1) or neutral (F2) fault detector is still
picked up, then BFO1-2 will close (OUT1-2), tripping the backup breakers. Control timer (T3) is used
to limit the breaker failure window of opportunity. Refer to the breaker failure timing diagram in
Section 1 for information on setting the delay and control timers.
2. Single-Pole Tripping BF Logic (Features: Output latch-in provided and Control timer limits operational
window). If single-pole tripping is used, a BFI input is available (IN6) to start delay timer T2. This input
is only supervised by the phase fault detector (F1). If the BFI input (IN6) is not reset by the time the
timer T2 times out and the phase fault detector (F1) is picked up, the BFO outputs (OUT1-2) closes,
tripping the backup breakers. Control timer, T3 is used to limit the breaker failure window of
opportunity. Refer to the breaker failure timing diagram in Section 1 for information on setting the
delay and control timers.
Neutral fault detector F2 is not used to supervise the single-pole BF logic because F2 is still picked up
by the phase imbalance after the fault clears. Three-phase BF logic is inhibited during this period
because there is no 3-phase BFI input active. For single-pole tripping, the phase pickup (PU1) must
be set above maximum load levels.
3. Trip Coil Status Monitor. Preprogrammed logic is provided using IN1 to provide breaker status and
IN2 for trip coil continuity. Refer to Application Data in this section for further details on the circuit
operation.
4. Breaker Arc Protection. Preprogrammed logic is provided using FD3 (F3) for the MAF fault detector,
IN1 for breaker status and OUT4 for the arc detector output. Refer to Application Data in this section
for further details on the circuit operation.
5. Block Reclose Output. Preprogrammed logic is provided using breaker resistor protection output
(O13) to drive the block reclose (BR) output (OUT3). Refer to Application Data in this section for
further details on the circuit operation.
6. Retrip Output. A Retrip output is provided to give a backup trip signal to the breaker trip coil. This can
either provide a separate path to a single trip coil or be hooked to the backup trip coil if available.
7. External Fault Trigger. The enhanced BE1-BPR relay provides the ability to save COMTRADE fault
records for twelve events in memory at one time. An external fault trigger is provided to allow other
multiple units to record the same event.
8. Alarm Output. An Alarm output is provided to signal relay failure or diagnostic alarm.