Siemens siprotec 7SA522 - Oscillographic Fault Records

SIPROTEC
®
4 Devices
4-137SA522 Manual
C53000-G1176-C119-2
4.3.3 Oscillographic Fault Records
As an option, SIPROTEC
®
4 devices can have waveform capturing and event record-
ing. Furthermore, the elements that are shown in the fault records can be selected by
the user.
The fault record data are retrieved from the device memory by DIGSI
®
4 and are
stored as oscillographic records in standard COMTRADE format.
The DIGRA
®
4 program is used to convert the oscillographic data into graphical rep-
resentations that can be used to analyse the fault or the event captured by the device.
DIGRA
®
4 calculates additional values from the waveform data, e.g. impedances and
rms values, and displays the captured and calculated values in:
q analogue curves with timebase (time signals),
q phasor diagrams,
q locus diagrams, and
q harmonic graphs.
digra009
Figure 4-8 DIGRA
®
4 graphical representations of the waveform data — view examples
Details can be found in the DIGSI
®
4 manual, order number E50417-H1176-C097,
and the DIGRA
®
4 manual, order number E50417-H1176-C070.