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SIPROTEC

4 Devices

4-14 7SA6 Manual

C53000-G1176-C133-1

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:

analogue curves with timebase (time signals),

phasor diagrams,

locus diagrams, and

harmonic graphs.

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.

Siemens siprotec 7SA6 User Manual

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