ERL F-PRO 5100, User Manual

Page: 52 / 192

4 Protection Functions and Specifications
4-6 F-PRO 5100 User Manual D02416R04.00
50BF Breaker
Failure
There are two sets of breaker failure protection functions, 50BF Main and
50BF Auxiliary – one for each breaker. When breaker failure is initiated by a
trip or other internal logic (user-settable through the output matrix) and the
breaker current still exists, two timers (T1 and T2 – user-settable) are started.
After these timers are timed out, and if the current still exists indicating a
breaker failure, the output of this function is set high. Use the two outputs of
this function to trip another trip coil or the next level of breakers, such as bus
breakers. The breaker failure protection logic diagram is shown below. Phase
current supervision is fixed at 4% of I nominal and is shown for a 5 A relay.
50 IMainA (fixed 0.2 amps)
50 IMainB (fixed 0.2 amps)
50 IMainC (fixed 0.2 amps)
T1
0
108
109
Breaker failure Initiator (from Output Matrix)
T2
0
Output1
Output2
Figure 4.2: 50BF Main Breaker Failure
50 IAuxA (fixed 0.2 amps)
50 IAuxB (fixed 0.2 amps)
50 IAuxC (fixed 0.2 amps)
T1
0
110
111
Breaker failure Initiator (from Output Matrix)
T2
0
Output1
Output2
Figure 4.3: 50BF Aux Breaker Failure
50BF Breaker Failure
Main Enable/disable
Pickup Delay 1 0.01 to 99.99 seconds
Pickup Delay 2 0.01 to 99.99 seconds
Auxiliary Enable/disable
Pickup Delay 1 0.01 to 99.99 seconds
Pickup Delay 2 0.01 to 99.99 seconds