[7sj80-svs-20061219, 2, en_US]
Figure 2-107
Logic diagram of the breaker failure protection
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.
With the setting Enabled w/o I>, only the circuit breaker auxiliary contacts are evaluated. The current crite-
rion CB Icrit.closed is not included in the logic (see Figure 2-105).
If this function is not required, then Disabled is set. The function can be set to ON or OFF under address
7001 FCT 50BF.
2.18.2
Functions
2.18 Breaker Failure Protection 50BF
320 SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017
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