Setting Notes - Siemens siprotec 7SD5 User Manual

2 Functions
Monitoring
Voltage failure, three- External (power system or
phase „Fuse-Failure- connection)
Monitor"
Voltage failure, single External (voltage transform-
and two-phase „Fuse- ers)
Failure-Monitor"
Voltage failure, three- External (power system or
phase connection)
Trip circuit supervision External (trip circuit or
control voltage)
1)
After three unsuccessful restarts, the device is taken out of service.
2)
DOK = „Device OK" = Break contact of the readiness relay = Life contact

2.22.1.5 Setting Notes

General The sensitivity of the measurement supervision function can be modified. Default
values are set at the factory, which are sufficient in most cases. If especially high op-
erating asymmetry in the currents and/or voltages is to be expected for the application,
or if it becomes apparent during operation that certain monitoring functions activate
sporadically, then the setting should be less sensitive.
The measurement supervision can be switched ON or OFF in address 2901
MEASURE. SUPERV.
388
Possible causes
Indication
Distance protection is
blocked,
Undervoltage protection
is blocked,
Weak-infeed tripping is
blocked,
Frequency protection is
blocked, and
Direction determination
of the earth fault protec-
tion is blocked
Indication
Distance protection is
blocked,
Undervoltage protection
is blocked,
Weak-infeed tripping is
blocked,
Frequency protection is
blocked, and
Direction determination
of the earth fault protec-
tion is blocked
Indication
Distance protection is
blocked,
Undervoltage protection
is blocked,
Weak-infeed tripping is
blocked,
Frequency protection is
blocked, and
Direction determination
of the earth fault protec-
tion is blocked
Indication
Malfunction Re- Indication (No.)
sponse
„VT FuseFail>10s"
(169),
„VT FuseFail" (170)
„VT FuseFail>10s"
(169),
„VT FuseFail" (170)
„Fail U absent" (168) As allocated
„FAIL: Trip cir."
(6865)
Device
As allocated
As allocated
As allocated
7SD5 Manual
C53000-G1176-C169-1