Setting Notes - Siemens SIPROTEC 4 Manual

Functions
2.17 Breaker Failure Protection 50BF
[7sj62-64-svs-20081110, 1, en_US]
Figure 2-99

Setting Notes

2.17.2
General
Breaker failure protection is only effective and accessible if address 170 50BF is set to Enabled or enabled
w/ 3I0>. Setting Enabled considers the three phase currents for total current monitoring. Setting enabled
w/ 3I0> additionally evaluates the ground current or the negative sequence system when only one phase
current occurs.
If this function is not required, then Disabled is set. The function can be set to ON or OFF under address
7001 FCT 50BF.
238
Logic diagram of the breaker failure protection
SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017