Siemens siprotec 7SA522, User Manual

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Control During Operation
7-21
7SA522 Manual
C53000-G1176-C119-2
The recorded data read into the PC memory are first shown in full on the screen. Cur-
rent, and possibly voltage, for each phase and the ground are represented separately.
The fault number, data and time, network, and feeder are also displayed.
Representation of primary or secondary quantities can be selected. The base values
for currents and voltages are the nominal values of the transformers (CTs or VTs). An
identical scale is used for all currents, relative to the largest occurring current value,
and for all voltages, relative to the largest occurring voltage value.
Figure 7-24 DIGRA 4 — Diagrams in the four possible views
During configuration any signal can be selected in its properties to be displayed in the
fault record. (See chapter 5.2.3.)
Further details about the many possibilities that DIGRA
®
4 offers can be found in the
DIGRA handbook (Order No. E50417–H1176–C070).
7.1.4.2 Saving the Fault Records
Storage of Fault
Recording Data Oscillographic records that are received from the device are not automatically saved
in the PC. The data can, however, be saved in files.
For more details, see the DIGSI
®
4 Operating Handbook, Order No. E50417–H1176–
C097, Section 9.4.
The oscillographic records stored in the device do not need to be erased, since the
data are stored in a revolving buffer. The oldest data are automatically overwritten by
the newest data.