Stability Check and Triggering Oscillographic Recordings
In order to verify the reliability of the protection relay even during inrush processes, closing tests can be
carried out to conclude the commissioning process. Oscillograhpic records provide the maximum information
about the behavior of the protection relay.
Prerequisite
Along with the capability of storing fault recordings via pickup of the protection function, the 7UT6x also has
the capability of capturing the same data when commands are given to the device via the DIGSI software, the
serial interface, or a binary input. For the latter, the information
>Trig.Wave.Cap.
must be allocated to a
binary input. In this case, a fault record is triggered e.g. via binary input when the protected object is ener-
gized.
Such a test fault record triggered externally (i.e. not caused by pickup of a protection function) is processed
like a normal oscillographic record, i.e. a fault log with number is generated which univocally identifies an
oscillographic record. However, these recordings are not displayed in the trip log as they are not fault events.
Start Test Measurement Recording
To trigger test measurement recording with DIGSI, click on Test in the left part of the window. Double click in
the list view the Test Wave Form entry (see Figure 3-49).
[7sa-testmessschrieb-starten-310702-kn, 1, en_GB]
Figure 3-49
Triggering oscillographic recording with DIGSI — example
Oscillographic recording is immediately started. During the recording, an annunciation is output in the left
area of the status line. Bar segments additionally indicate the progress of the procedure.
The SIGRA or the Comtrade Viewer program is required to view and analyze the oscillographic data.
Such test records are especially informative on power transformers when they are triggered by the switch-on
command of the transformer. Since the inrush current may have the same effect as a single-ended infeed, but
which may not initiate tripping, the effectiveness of the inrush restraint is checked by energising the power
transformer several times.
3.3.14
Mounting and Commissioning
3.3 Commissioning
SIPROTEC 4, 7UT6x, Manual 391
C53000-G1176-C230-5, Edition 09.2016
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