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Monitoring
Possible causes
Adjustment values
Internal (EEPROM or RAM)
Modules
Module does not comply
with order number (MLFB)
Current sum
Internal (measured value
acquisition)
Current symmetry
External (power system or
current transformer)
Broken wire
External (power system or
current transformer)
Voltage symmetry
External (power system or
voltage transformer)
Voltage phase
External (power system or
sequence
connection)
Voltage failure, 3-
External (power system or
phase"Fuse-Failure-
connection)
Monitor"
Voltage loss,
External (voltage trans-
formers)
"Fuse-Failure-Monitor"
Voltage failure, 3-phase External (power system or
connection)
Trip circuit supervision
External (trip circuit or
control voltage)
1)
Following three unsuccessful restarting attempts, the device is put out of operation
2)
DOK = "Device OK" = NC contact of the readiness relay = life contact
2.14.1.5
Setting Notes
General
The sensitivity of measured value monitoring can be modified. Default values which are sufficient in most
cases are preset. If especially high operational asymmetries of the currents and/or voltages are anticipated
during operation, or if it becomes apparent during operation that certain monitoring functions pick up sporad-
ically, then the setting should be less sensitive.
The measurement supervision can be switched ON or OFF in address 2901 MEASURE. SUPERV.
Symmetry Monitoring
Address 2902 BALANCE V-LIMIT determines the limit voltage (phase-to-phase), above which the voltage
symmetry monitor is effective. Address 2903 BAL. FACTOR V is the associated symmetry factor; that is, the
slope of the symmetry characteristic curve. The indication
address 2908 T BAL. V LIMIT. These settings can only be changed via DIGSI at Display Additional
Settings.
SIPROTEC 4, 7SD80, Manual
E50417-G1100-C474-A2, Edition 02.2018
Fault response
Indication:
Using default values
Indications:
Protection out of opera-
tion
Indication
Total blocking of the
differential protection
Indication
Indication
Phase-selective blocking
of the differential protec-
tion
Indication
Indication
Indication
Undervoltage protection
blocked,
Frequency protection
blocked
Indication
Undervoltage protection
blocked,
Indication
Undervoltage protection
blocked,
Indication
Fail V balance (no. 167) can be delayed at
2.14 Monitoring Functions
Indication (no.)
Output
as routed
Alarm adjustm.
(193)
"Störung BG1...5"
DOK
(183 ... 187)
out
und ggf.
Error A/D-conv. .
(181)
Failure Σi (289)
as routed
as routed
Fail I balance
(163)
as routed
Broken Iwire L1
(290),
Broken Iwire
L2 (291), Broken
Iwire L3 (292)
as routed
Fail V balance
(167)
Fail Ph. Seq. (171) as routed
as routed
VT FuseFail>10s
(169),
VT FuseFail (170)
as routed
VT FuseFail>10s
(169),
VT FuseFail (170)
Fail V absent (168) as routed
as routed
74TC Trip cir.
(6865)
Functions
2)
drops
159
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