ERL F-PRO 116, User Manual

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5-14 F-PRO 116 User Manual D05125R01.20
50BF Breaker Failure
There are two sets of breaker failure protection functions. When breaker failure is initiated by an
external 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.
50
– Breaker Failure Logic diagram
Figure 5.12: Logic Diagram of 50BF Functions
Table 5.13: 50BF Breaker Failure Settings
Setting Description Range
Function Activation Enable/Disable
Pick up I 0.05 to 2.0A (1A) / 0.25 to 10.0A (5A)
Pickup Delay 1 0.05 to 999.99 seconds
Pickup Delay 2 0.05 to 999.99 seconds