[abl-bei-norm-fehlerkllaer-u-bei-lsvs-2stufig-090116, 1, en_US]
Figure 2-101 Time sequence example for normal clearance of a fault, and for circuit breaker failure with
two-element breaker failure protection
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
>50BFactiv.3I0>
you can activate the threshold value 50BF PICKUP IE> also for
checking the plausibility of the phase currents.
Settings
The table indicates region-specific presettings. Column C (configuration) indicates the corresponding secon-
dary nominal current of the current transformer.
Addr.
Parameter C Setting Options Default Setting Comments
7001 FCT 50BF OFF
ON
OFF 50BF Breaker Failure
Protection
7004 Chk BRK CONTACT OFF
ON
OFF Check Breaker contacts
7005 TRIP-Timer 0.06 .. 60.00 sec; ∞ 0.25 sec TRIP-Timer
7006 50BF PICKUP 1A 0.05 .. 20.00 A 0.10 A 50BF Pickup current
threshold
5A 0.25 .. 100.00 A 0.50 A
7007 50BF PICKUP IE> 1A 0.05 .. 20.00 A 0.10 A 50BF Pickup earth current
threshold
5A 0.25 .. 100.00 A 0.50 A
7008 50BF-2 Delay 0.06 .. 60.00 sec; ∞ 0.50 sec Delay of 2nd stage for
busbar trip
2.17.3
Functions
2.17 Breaker Failure Protection 50BF
240 SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017
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