GE D90 Plus Instruction Manual page 507

CHAPTER 10: DIGITAL FAULT RECORDER
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 442: 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
8
24
48
8
24
48
20
64
24
64
41
64
Plus
Plus
(examples)
Sampling rate Digital
channels
256 samples/cycle 128
256 samples/cycle 128
256 samples/cycle 128
128 samples/cycle 128
128 samples/cycle 128
128 samples/cycle 128
64 samples/cycle 128
64 samples/cycle 128
32 samples/cycle 64
32 samples/cycle 64
16 samples/cycle 64
16 samples/cycle 64
TRANSIENT RECORDER
automatically calculates the
Analog Record
channels length
16 57
16 22
16 11
16 104
16 40
16 20
16 80
16 26
8 135
8 53
8 124
8 81
497