If such a malfunction is not cleared by the restart, an additional restart attempt is begun. After three unsuc-
cessful restarts within a 30 second window of time, the device automatically removes itself from service and
the red Error LED lights up. The operational readiness relay (Life contact) opens and issues an alarm (alterna-
tively as NO or NC contact).
Offset Monitoring
This monitoring checks all data channels in the ring buffer by using offset filters, for faulty offset formation of
the analog/digital converters and the analog input paths. Any offset errors are detected by a use of DC voltage
filters and the associated scan values corrected up to a particular limit. If this is exceeded an indication is
issued (191
Error Offset
) the one which flows in the warn group annunciation (indiciation 160).
Monitorings of the Synchronizing Function
Channel Monitoring
This monitoring has the task of examining measurement signals and the associated negated signals of the
synchronizing function in the paralleling device operating mode, for consistency. By numerical check of
instantaneous values and summation formation (normally ≈ zero must result), the input transformers, analog/
digital converters, sampling and the ring buffer are checked. If the data of the negated and nonnegated
voltage for a voltage channel are detected as inadmissible, the particular indication
Sync Fail Ch U1
or
Sync Fail Ch U2
is issued and the synchronizing function blocked.
Monitoring of the Analog/Digital Converter
For analog/digital conversion of a maximum total of 6 measurement signals, two ADC converters are available
each with four channels. The two remaining channels are used for monitoring purposes with one channel of
the other converter in each case. The output values of the redundant channels are checked for consistency
with the those of the original channels. If deviations are detected here an indication
Error ADC
is generated
and both synchronizing function and all protection functions are blocked.
Phase Sequence Supervision
The phase sequence direction of both voltage sides is monitored for consistency of parameterisation. A
requirement for phase sequence monitoring is connection of an additional phase-to-phase voltage on the two
sides U1 and U2 and the enabling of the phase sequence check using parameter 6x13
PHASE SEQUENCE
. In
addition the voltages at all inputs must exceed a paramerizable minimum voltage.
Phase rotation is checked by supervising the phase sequence of the voltages. This is established from the time
difference between the zero transitions of the individual phases If measured and parametrized phase
sequence direction differ an indication
SyncSeq U1 fail
or
SyncSeq U2 fail
is output and the synchro-
nizing function blocked.
Check of Data Current State and Continuity
The measurement voltages are continually entered as numerical values in a ring buffer. For each of the meas-
ured values a corresponding sequence of numerical scan values exist in the ring buffers, which reflect the
chronological course of the analog values. To ensure that actually current values are available an internal
counter queries the sampling values and monitors their progress. If the monitoring detects a current state
fault, the indication
Fail. Sampling
is issued and as long as this prevails a closure command by the
synchronizing function is suppressed.
If transient disturbances lead to unsteady changes in the sampling values, errors can occur in the frequency
and angle calculations leading to wrong connections. The continuity supervision evaluates the difference of
consecutive sampling values for each measured value, and on detection of an unsteady state blocks connec-
tion for a defined time period. A corresponding indication
Sync Fail Data
is produced. Since this involves
a transient error, the protection functions of the device are not blocked.
2.12.3
Functions
2.12 Supervision
SIPROTEC 4, 7VE61 and 7VE63, Manual
113
C53000-G1176-C163-3, Edition 10.2017
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