Functions
2.42 Monitoring Functions
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
293
1)
After three unsuccessful restarts, the device is taken out of service.
2)
DOK = "Device Okay" = Operational readiness relay drops off, protection and control functions are blocked. Operator
communication is still possible
2.42.2.3 Setting Notes
Fuse Failure Monitor
The fuse failure monitor will only be effective and accessible if address 180 FUSE FAIL MON. is set Enabled
during configuration. If the function is not required, it is set to Disabled. The function ON or OFF can be acti-
vated at address 8001 FUSE FAIL MON..
The thresholds U
2
/U
1
≥ 40 % and I
2
/I
1
≤ 20 % for detecting 1-pole and 2-pole voltage failures are fixed. The
thresholds for detecting a 3-pole voltage failure (undervoltage threshold = 10 V, below which the failure detec-
tion feature responds unless the current changes significantly and the differential current monitoring = 0.5 I
N
)
are likewise fixed and need not be set.
2.42.2.4 Settings
Current Phase Sequence
Side 2
External
(power system or connec-
tion)
Indication „FailPh.Seq I S2“
(No. 266)
as allocated
Fuse Failure Monitor External
(voltage transformer)
Indication „VT Fuse Failure“
(No. 6575)
as allocated
Trip Circuit Monitoring External (trip circuit or
control voltage)
Indication „FAIL: Trip cir.“
(No. 6865)
as allocated
Monitoring Possible Causes Malfunction
Response
Message (No.) Output
Addr. Parameter Setting Options Default Setting Comments
8001 FUSE FAIL MON. OFF
ON
OFF Fuse Failure Monitor
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