End Fault Protection
The end fault protection can be switched separately
ON
or
OFF
in address 3921
End Flt. elem.
. An end
fault is a fault between the circuit breaker and the current transformer set of the feeder. The end fault protec-
tion presumes that the device is informed about the circuit-breaker position via breaker auxiliary contacts
connected to binary inputs.
If, during an end fault, the circuit breaker is tripped by a reverse element of the feeder protection or by the
busbar protection (the fault is a busbar fault as determined from the location of the current transformers), the
fault current will continue to flow, because the fault is fed from the remote end of the feeder circuit.
The time
EndFault Delay
(address 3922) is started when, during the time of pickup condition of the feeder
protection, the circuit-breaker auxiliary contacts indicate open poles and, at the same time, current flow is still
detected (address 3902). The trip command of the end fault protection is intended for the transmission of an
intertrip signal to the remote end circuit breaker.
Thus, the time delay must be set such that it can bridge out short transient apparent end fault conditions
which may occur during switching of the breaker.
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
3901
FCT 50BF Break.
ON
OFF
ON
50BF Breaker Failure
Protection
3902
50BF PICKUP
1A
0.05 .. 20.00 A
0.10 A
50BF Pickup current
threshold
5A
0.25 .. 100.00 A
0.50 A
3905
50BF-1 Delay 3p
0.00 .. 30.00 sec
0.00 sec
Delay after 3pole start for
local trip
3906
50BF-2 Delay
0.00 .. 30.00 sec
0.15 sec
Delay of 2nd element for
busbar trip
3907
T3-BkrDefective
0.00 .. 30.00 sec
0.00 sec
Delay for start with defec-
tive bkr.
3908
Trip BkrDefect.
NO
with Local trip
with Bus trip
w/Local&Bustrip
NO
Trip output selection with
defective bkr
3909
Chk BRK CONTACT
NO
YES
YES
Check Breaker contacts
3912
50NBF PICKUP
1A
0.05 .. 20.00 A
0.10 A
50NBF Pickup neutral
current threshold
5A
0.25 .. 100.00 A
0.50 A
3913
T2StartCriteria
With exp. of T1
Parallel withT1
Parallel withT1
T2 Start Criteria
3921
End Flt. elem.
ON
OFF
OFF
End fault element
3922
EndFault Delay
0.00 .. 30.00 sec
2.00 sec
Trip delay of end fault
element
2.6.3
Functions
2.6 Circuit Breaker Failure Protection 50BF
102
SIPROTEC 4, 7SD80, Manual
E50417-G1100-C474-A2, Edition 02.2018
Summary of Contents for SIPROTEC 4 7SD80
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