GE Multilin 850

4–46 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
DEVICE CHAPTER 4: SETPOINTS
Transient Recorder
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.
Path: Setpoints > Device > Transient Recorder
NUMBER OF RECORDS
Range: 1 to 16 in steps of 1
Default: 5
The selection from the range defines the desired number of records.
SAMPLES PER CYCLE
Range: 8/c, 16/c, 32/c, 64/c, 128/c
Default: 32/c
This setpoint provides a selection of samples-per-cycle for representing the waveform.
The waveform records can be viewed using the 8-series PC program.
TRIGGER MODE
Range: Overwrite, Protected
Default: Overwrite
When “Overwrite” setting is selected, the new records overwrite the old ones, meaning
the relay will always keep the newest records as per the selected number of records. In
“Protected” mode, the relay will keep the number of records corresponding to the
selected number of records, without saving further records that are beyond the selected
number of records.
Number of Records Sample Rate Analog Channels Length-Cycles
1 128 9 250
1 64 9 450
1 32 9 751
1 16 9 1127
1 8 9 1503
8 128 9 55
8 64 9 100
8 32 9 167
8 16 9 250
8 8 9 334
16 128 9 29
16 64 9 53
16 32 9 88
16 16 9 132
16 8 9 176