Settings - Siemens SIPROTEC 4 7SJ61 Manual

Functions
2.12 Breaker Failure Protection 50BF
[abl-bei-norm-fehlerkllaer-u-bei-lsvs-2stufig-090116, 1, en_US]
Figure 2-69
Pickup Values
The pickup value of the current flow monitoring is set under address 7006 50BF PICKUP, and the pickup
value of the ground current monitoring under address 7007 50BF PICKUP IE>. The threshold values must
be set at a level below the minimum fault current for which the total current monitoring must operate. A
setting of 10 % below the minimum fault current for which breaker failure protection must operate is recom-
mended. The pickup value should not be set too low since otherwise there is a risk that transients in the
current transformer secondary circuit may lead to extended dropout times if extremely high currents are
switched off.
Via binary input 1404
checking the plausibility of the phase currents.

Settings

2.12.3
The table indicates region-specific presettings. Column C (configuration) indicates the corresponding secon-
dary nominal current of the current transformer.
Addr. Parameter
7001 FCT 50BF
7004 Chk BRK CONTACT
7005 TRIP-Timer
7006 50BF PICKUP
7007 50BF PICKUP IE>
7008 50BF-2 Delay
172
Time sequence example for normal clearance of a fault, and for circuit breaker failure with
two-element breaker failure protection
>50BFactiv.3I0> you can activate the threshold value 50BF PICKUP IE> also for
C Setting Options
OFF
ON
OFF
ON
0.06 .. 60.00 sec; ∞
1A 0.03 .. 20.00 A
5A 0.15 .. 100.00 A
0.03 .. 20.00 A
0.06 .. 60.00 sec; ∞
Default Setting Comments
OFF 50BF Breaker Failure
Protection
OFF Check Breaker contacts
0.25 sec TRIP-Timer
0.10 A 50BF Pickup current
threshold
0.50 A
0.10 A 50BF Pickup earth current
threshold
0.50 sec Delay of 2nd stage for
busbar trip
SIPROTEC 4, 7SJ61, Manual
C53000-G1140-C210-6, Edition 05.2016