Parameter 8415ΔI< BWD determines the pickup threshold for the differential current up to wire break leads
to differential protection blocking. If the differential current is greater than this threshold then a fault within
the protected object (e.g. transformer) is assumed and blocking of the differential protection is cancelled.
Asymmetrical measuring voltage failure "Fuse Failure Monitor"
The settings for the fuse failure monitor for single-phase measuring voltage failure (address 8426 FFM U<max
(3ph)), are to be selected such that reliable activation occurs if a phase voltage fails, but not such that false
activation occurs during earth faults Addresses 8422 FFM I< M1, 8423 FFM I< M2 and 8424 FFM I< M3
must be set as sensitive as required for the respective measuring location or side (with earth faults, below the
smallest fault current). This parameter can only be altered using DIGSI under Additional Settings.
In address 8403 FUSE FAIL MON. the fuse failure monitor can be switched off, e.g. during asymmetrical
testing.
Three-phase measuring voltage failure "Fuse Failure Monitor"
In address 8426 FFM U<max (3ph) the minimum voltage threshold is set. If the measured voltage drops
below this threshold and a simultaneous current jump is not detected while all three phase currents are
greater than the minimum current set for the respective side or measuring location (addresses 1111 to 1142).
This parameter can only be altered using DIGSI under Additional Settings.
Settings
Addresses which have an appended “A” can only be changed with DIGSI, under “Additional 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
2911A FFM U>(min) 10 .. 100 V 20 V Minimum Voltage
Threshold U>
8401 BROKEN WIRE OFF
BWD Al and Blk
BWD Al and ABlk
BWD Al only
OFF Fast broken current-wire
supervision
8403 FUSE FAIL MON. OFF
ON
OFF Fuse Failure Monitor
8414 T BWD delay 0.0 .. 180.0 sec 1.0 sec Delay time for BWD super-
vision
8415 ΔI< BWD 0.05 .. 5.00 I/InO 1.00 I/InO min differential current for
BWD
8422A FFM I< M1 1A 0.04 .. 2.00 A 0.10 A I< for FFM detection M1
5A 0.20 .. 10.00 A 0.50 A
8423A FFM I< M2 1A 0.04 .. 2.00 A 0.10 A I< for FFM detection M2
5A 0.20 .. 10.00 A 0.50 A
8424A FFM I< M3 1A 0.04 .. 2.00 A 0.10 A I< for FFM detection M3
5A 0.20 .. 10.00 A 0.50 A
8426A FFM U<max (3ph) 2 .. 100 V 5 V Maximum Voltage
Threshold U< (3phase)
Information List
No.
Information Type of
Informa-
tion
Comments
- SysIntErr. IntSP Error Systeminterface
- Error FMS1 OUT Error FMS FO 1
2.19.3.3
2.19.3.4
Functions
2.19 Monitoring Functions
266 SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
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