GE D90 Plus Instruction Manual page 523

CHAPTER 10: DIGITAL FAULT RECORDER
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 441: Trigger and re-trigger sequence
The length of a transient record is also user-configurable. The number of transient records
Plus
stored by the D90 is a function of the record length, the time-resolution of the recording,
and of the number of configured channels. The D90
number of transient records based on the user-defined setting values.
The transient 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).
Plus
The D90 contains a finite amount of memory for record storage. The following table
shows how the transient recorder configuration affects the number of available records.
Table 39: Transient records stored by the D90
Records Sampling rate
8 256 samples/cycle
24 256 samples/cycle
48 256 samples/cycle
8 128 samples/cycle
24 128 samples/cycle
48 128 samples/cycle
20 64 samples/cycle
64 64 samples/cycle
24 32 samples/cycle
64 32 samples/cycle
41 16 samples/cycle
64 16 samples/cycle
Plus
automatically calculates the
Plus
(examples)
Digital Analog
channels channels
128 16
128 16
128 16
128 16
128 16
128 16
128 16
128 16
64 8
64 8
64 8
64 8
TRANSIENT RECORDER
Record length
57 cycles
22 cycles
11 cycles
104 cycles
40 cycles
20 cycles
80 cycles
26 cycles
135 cycles
53 cycles
124 cycles
81 cycles
513