Functions
6-1537SJ62 Manual
C53000-G1140-C121-1
6.17.2.2 Information
6.17.3 Description of Fuse-Failur-Monitor
Single-Phase Mea-
surement Voltage
Loss or Fuse Fail-
ure Monitoring
In the event of a loss of measured voltage on one phase (typically due to a short circuit
or broken conductor in the voltage transformer secondary circuit), the device will false-
ly detect zero voltage. False detection of zero voltage can cause problems with the
directional overcurrent protection and the undervoltage protection.
If fuses are used instead of a secondary miniature circuit breaker with connected aux-
iliary contacts, then the fuse failure monitoring can detect problems in the voltage
transformer secondary circuit. If phase-to-phase voltages and the displacement volt-
age are supplied to the system, then the fuse failure monitor is masked. Of course,
supervision of the miniature circuit breaker and the fuse failure monitor can be used
at the same time.
If zero sequence voltage occurs, without a ground current being measured at the
same time, the device concludes that an unsymmetrical fault has occurred in the volt-
age transformer secondary circuit. The processing of the displacement voltage pro-
cessing of the sensitive ground fault detection and the undervoltage protection func-
tions are blocked.
F# LCD-Text Comments
0162 Failure Σ I Failure: Current Summation
0163 Fail I balance Failure: Current Balance
0167 Fail V balance Failure: Voltage Balance
0171 Fail Ph. Seq. Failure: Phase Sequence
0175 Fail Ph. Seq. I Failure: Phase Sequence Current
0176 Fail Ph. Seq. V Failure: Phase Sequence Voltage
0161 Fail I Superv. Failure: general Current Supervision
0197 MeasSup OFF Measurement Supervision is switched OFF
6509 >FAIL:FEEDER VT >Failure: Feeder VT
6510 >FAIL: BUS VT >Failure: Busbar VT
Note:
For ungrounded systems or systems which generate small amounts of ground fault
current, fuse failure monitoring must not be used!
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