Overview
The “Inherent circuit breaker failure protection” function acts in the event of faults within the protection range of the busbar protection system. If external errors occur, you need the circuit breaker failure protection for supervision purposes and for the busbar protection reserve disconnection of all circuit-breakers that are assigned to the busbars.
For more detailed information on “Inherent 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
Setting Parameters
Setting parameters for Inherent circuit breaker failure protection
| Addr. | Parameter | C | Setting Options | Default Setting |
| 50BF Inherent | ||||
| _:1 | 50BF Inherent:Mode | off on test |
on | |
| _:102 | 50BF Inherent: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 | ||
| _:101 | 50BF Inherent: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 | ||
| _:110 | 50BF Inherent:Delay T2 for 3-pole trip | 0.050 s to 60.000 s | 0.130 s | |
| _:112 | 50BF Inherent:Minimum operate time | 0.00 s to 60.00 s | 0.10 s | |
| _:120 | 50BF Inherent:3I0 crite- rion | Direct release Plausibility check |
Plausibility check | |
| _:121 | 50BF Inherent:I2 crite- rion | Direct release Plausibility check |
Plausibility check | |
| _:122 | 50BF Inherent: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 | ||
| _:123 | 50BF Inherent: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 | ||
| _:154 | 50BF Inherent:Imme- diate dropout | 0 1 |
true | |
Logic Diagrams & highlights
Overview of the Logic of the Inherent Circuit-Breaker Failure Protection Function
Start
Current-Flow Criterion
Pickup/Dropout
Delay/Tripping
