Siemens SIPROTEC 5 Manual page 251

[dwTrendDef-220514-01, 1, en_US]
Figure 7-32
For the parameterization, specify a maximum memory capacity for the storage of recordings. The trend
recorder is organized as a ring buffer. When the memory is filled completely, the oldest data are overwritten
automatically.
Mode
The trend recorder operates only if the Mode is set to on .
Recording is interrupted if Mode is set to off during recording. Recording starts again if Mode is set again to
on .
NOTE
i
i
In the mode off , the continuous recorder no longer records any measured values, but continues to record
device statuses (time jumps, modes on/off, as well as disconnection and recovery of the supply voltage).
PQDif recordings are still generated, even though the trend recorder is set to the mode off. It is recom-
mended to delete the recorder instance in case of long-term non-use.
Ring-Buffer Mode
With the trend recorder, data is stored on the flash memory in blocks. The new data of the last 10-minute
interval are available every 10 minutes. If, while recording of a record, the device determines that the free
space remaining on the recorder partition is too small, the oldest data block is erased automatically. During
this process, complete time segments in the specified grid are always lost.
Disconnection and Recovery of Supply Voltage
NOTE
i i
If the supply voltage of the device is disconnected intentionally or by mistake, measuring gaps will appear
for the period of the disconnection. However, the recorded data remains stored and can be read after
recovery of the supply voltage.
SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017
Operation of the Trend Recorder, Voltage Interruption
Fault Recorder
7.2 Function-Group Type Recorder
251