522
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
DISTURBANCE RECORDER
CHAPTER 10: DIGITAL FAULT RECORDER
The recorder has two storage modes: protected and automatic overwrite. When the
memory is filled, either no new records are written to memory (protected mode) or the
oldest record is overwritten (automatic overwrite mode).
Front panel indications
The digital fault reporter summary screen provides an indication that the disturbance
recorder is ready to capture data and has memory available. In protected mode, the
Ready
to Capture
indication is green when all of the following conditions hold.
•
The disturbance recorder is enabled.
•
The block trigger input is not asserted.
•
Memory is available.
•
A record capture is not currently in progress.
Otherwise the indication is red. In automatic overwrite mode, the
Ready to Capture
indication is green when all of the following conditions hold.
•
The disturbance recorder is enabled.
•
The block trigger input is not asserted.
•
A record capture is not currently in progress.
The
Memory Available
indication is green when less than 80% of the memory has been
filled. It is yellow when the amount of memory filled is between 80% and 99%, and it is red
if 100% of the memory is filled.
Figure 451: Digital fault reporter summary screen
The disturbance recorder screen shows the individual records stored on the device. This
screen also has an indication of any active triggers (red indication) for the disturbance
recorders. If a continuous trigger is permanently active, it will not fill the memory of the
recorder. After the first record is generated it is effectively disabled by the trigger logic;
however, its status will be displayed on this screen. The user can also force triggering of the
recorder from this screen.
