Overview
The “Circuit breaker failure protection” function monitors the tripping of the associated circuit breaker (CB) and generates a backup trip signal if the circuit-breaker fails.
Starting with version V7.50, the previous function CB failure has been replaced with the new Circuit-breaker failure protection with an adaptive algorithm Adaptive CB failure protection. In this way, you achieve a faster, more reliable detection of the opening of the circuit breaker in the event of complex signal histories.
For more detailed information on “Circuit breaker failure protection” function, refer to SIPROTEC 5 devices, V8.30 & higher manuals.
To see other supported functions, click here.
Structure/Embedding of the Function
Function Logic Overview
Setting Parameters
Setting parameters for Circuit breaker failure protection
| Addr. | Parameter | C | Setting Options | Default Setting |
| 50BF Ad.CBF # | ||||
| _:1 | 50BF Ad.CBF #:Mode | off on test |
on | |
| _:105 | 50BF Ad.CBF #:Holding int. start signal | no yes |
yes | |
| _:107 | 50BF Ad.CBF #:Start via binary input | no 2 channel 1 channel |
no | |
| _:106 | 50BF Ad.CBF #:Holding ext. start signal | no yes |
no | |
| _:111 | 50BF Ad.CBF #:Sup.time f. release signal |
0.00 s to 1.00 s | 0.06 s | |
| _:103 | 50BF Ad.CBF #:CB aux.cont. crit. allowed |
no w. ‘CB pos. closed 3p.’ |
no | |
| _:104 | 50BF Ad.CBF #:Dropout | with effective criterion w. aux.c. and curr.crit. |
with effective criterion | |
| _:108 | 50BF Ad.CBF #:Retrip after T1 | no start T2 after T1 parallel start T2, T1 |
no | |
| _:102 | 50BF Ad.CBF #:Threshold phase current | 1 A @ 100 Irated | 0.030 A to 35.000 A | 0.500 A |
| 5 A @ 100 Irated | 0.15 A to 175.00 A | 2.50 A | ||
| 1 A @ 1.6 Irated | 0.001 A to 1.600 A | 0.500 A | ||
| 5 A @ 1.6 Irated | 0.005 A to 8.000 A | 2.500 A | ||
| _:101 | 50BF Ad.CBF #:Threshold sensitive | 1 A @ 100 Irated | 0.030 A to 35.000 A | 0.250 A |
| 5 A @ 100 Irated | 0.15 A to 175.00 A | 1.25 A | ||
| 1 A @ 1.6 Irated | 0.001 A to 1.600 A | 0.250 A | ||
| 5 A @ 1.6 Irated | 0.005 A to 8.000 A | 1.250 A | ||
| _:109 | 50BF Ad.CBF #:Delay T1 for 3-pole retrip |
0.000 s to 60.000 s | 0.050 s | |
| _:110 | 50BF Ad.CBF #:Delay T2 for 3-pole trip |
0.050 s to 60.000 s | 0.130 s | |
| _:112 | 50BF Ad.CBF #:Minimum operate time | 0.00 s to 60.00 s | 0.10 s | |
| _:120 | 50BF Ad.CBF #:3I0 criterion | Direct release Plausibility check |
Plausibility check | |
| _:121 | 50BF Ad.CBF #:I2 criterion | Direct release Plausibility check |
Plausibility check | |
| _:122 | 50BF Ad.CBF #:Threshold 3I0 dir. release | 1 A @ 100 Irated | 0.030 A to 35.000 A | 0.250 A |
| 5 A @ 100 Irated | 0.15 A to 175.00 A | 1.25 A | ||
| 1 A @ 1.6 Irated | 0.001 A to 1.600 A | 0.250 A | ||
| 5 A @ 1.6 Irated | 0.005 A to 8.000 A | 1.250 A | ||
| _:123 | 50BF Ad.CBF #:Threshold I2 dir. release | 1 A @ 100 Irated | 0.030 A to 35.000 A | 0.250 A |
| 5 A @ 100 Irated | 0.15 A to 175.00 A | 1.25 A | ||
| 1 A @ 1.6 Irated | 0.001 A to 1.600 A | 0.250 A | ||
| 5 A @ 1.6 Irated | 0.005 A to 8.000 A | 1.250 A | ||
| _:124 | 50BF Ad.CBF #:Monit. time for BI ">Start" |
0.05 s to 60.00 s | 15.00 s | |
| _:125 | 50BF Ad.CBF #:Monit.tm. f.BI ">Release" |
0.05 s to 60.00 s | 15.00 s | |
| _:154 | 50BF Ad.CBF #:Imme- diate dropout |
0 1 |
true | |
| _:155 | 50BF Ad.CBF #:BI start external latch | 0 1 |
true | |
Logic Diagrams & highlights
Internal Start of the Circuit-Breaker Failure Protection Function
Configuration of the External Start of the Circuit-Breaker Failure Protection Function
External Start of the Circuit-Breaker Failure Protection Function, Logic
Current-Flow Criterion
Circuit-Breaker Auxiliary Contact Criterion
Pickup/Dropout of the Circuit-Breaker Failure Protection Function
Delay/Tripping of the Circuit-Breaker Failure Protection Function
Circuit-Breaker Failure Protection with External Start, Tripping Repetition, and 3‑Pole Tripping (T2)
