Setting Notes - Siemens SIPROTEC 4 7SJ61 Manual

Functions
2.12 Breaker Failure Protection 50BF
[7sj61-svs-20061219, 1, en_US]
Figure 2-67
2.12.2

Setting Notes

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.
Criteria
Address 7004 Chk BRK CONTACT establishes whether or not the breaker auxiliary contacts connected via
binary inputs are to be used as a criterion for pickup. If this address is set to ON, then current criterion and/or
the auxiliary contact criterion apply. This setting must be selected if the breaker failure protection is started by
170
Logic diagram of the breaker failure protection
SIPROTEC 4, 7SJ61, Manual
C53000-G1140-C210-6, Edition 05.2016