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Table 6-13
Summary of the device response to detected failures
Monitoring
Voltage sum
Voltage symmetry
Voltage phase rotation
Voltage failure,
three-phase,
Fuse failure monitor
Voltage failure,
single-/two-phase,
Fuse failure monitor
Voltage failure,
three-phase
Trip circuit supervision
1
) Following three unsuccessful reboot attempts, the device is taken out of service
2
) D.OK = "Device Okay" = Live contact relay
7SA6 Manual
C53000-G1176-C156-2
Possible causes
internal (measured value
acquisition)
external (primary plant or
voltage transformers)
Extrem (primary plant or
connection)
external (primary plant or
connection)
external (voltage trans-
formers)
Extrem (primary plant or
connection)
external (trip circuit or
control voltage failure)
Failure response
General alarms
alarm
alarm
alarm
alarm
distance protection
blocked
alarm
distance protection
blocked
alarm
distance protection
blocked
alarm
Alarm (function no.)
"Fail ΣU Ph-E" (165)
"Fail U balance" (167) as allocated
"Fail Ph. Seq." (171)
"VT Fuse fail > 10 s" (169) as allocated
"VT Fuse fail > 10 s" (169) as allocated
"Fail U meas" (168)
"FAIL: Trip cir."
(6865)
Functions
Output
as allocated
as allocated
as allocated
as allocated
6-285
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