ERL L-PRO 4000, Руководство пользователя

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4 Protection Functions and Specifications
4-36 L-PRO 4000 User Manual D02706R02.30
50BF Breaker
Failure
The Breaker Failure (BF) protection function detects breaker failures. There
are 2 sets of breaker failure protection functions, 50BF Main and 50BF Auxil-
iary, 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, 2 timers (T1 and T2, user-settable) are started. When these timers
are timed out and if the current still exists (which indicates breaker failure), the
output of this function is set high. Use the 2 outputs of this function to trip an-
other trip coil or the next level of breakers, such as bus breakers.
Figure 4.22: 50BF Main Breaker Failure
Input 3 Enable/Disable
Pickup 0.10 to 50.0 A secondary (5A)
0.02 to 10.0 A secondary (1A)
Pickup Delay 0.00 to 10.00 Seconds
Input 4 Enable/Disable
Pickup 0.10 to 50.0 A secondary (5A)
0.02 to 10.0 A secondary (1A)
Pickup Delay 0.00 to 10.00 Seconds
Table 4.19: 50LS Low Set Overcurrent Settings
Table 4.20: 50BF Breaker Failure Settings
Main Enable/Disable
Pickup Delay 1 0.01 to 99.99 Seconds
Pickup Delay 2 0.01 to 99.99 Seconds
Breaker Current Pickup 0.10 to 50.0 A secondary (5A)
0.02 to 10.0 A secondary (1A)