GE 845 Instruction Manual page 168

DEVICE
4–64
The Transient Recorder contains waveforms captured at the same sampling rate as the
other relay data at the point of trigger. By default, data is captured for all AC current and
voltage inputs available on the relay as ordered. Transient record is generated upon
change of state of at least one of the assigned triggers: "Trigger Source", "Trigger on
Pickup", "Trigger on Operate", "Trigger on Alarm", or "Trigger on Trip".
The number of cycles captured in a single transient record varies based on the number of
records, sample rate, and the number of selected channels. There is a fixed amount of
data storage for the Transient Recorder: the more data captured, the less the number of
cycles captured per record. Since the 9 analog channels are captured in the record by
default, and the number of digital channels minimally affect the length of the record, the
cycles per record are well approximated in the following table.
Number of Records Sample Rate
1 128
1 64
1 32
1 16
1 8
8 128
8 64
8 32
8 16
8 8
16 128
Analog Channels
9
9
9
9
9
9
9
9
9
9
9
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
Length-Cycles
250
450
751
1127
1503
55
100
167
250
334
29