528 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
DISTURBANCE RECORDER CHAPTER 10: DIGITAL FAULT RECORDER
Available Signals
Range: any FlexAnalog quantity
Default: Off
This setting specifies the FlexAnalog quantity to be recorded for the channel. The size of
each disturbance record depends in part on the number of parameters selected.
Parameters set to “Off” are ignored.
High Triggering
Range: Off, Trigger Only, Trigger/Re-Trigger, Re-Trigger Only
Default: Off
This setting selects the high triggering function for the analog channel. When set to
“Trigger Only” or “Trigger/Re-Trigger,” the disturbance recorder initiates data capture
when the magnitude of the signal is greater than the value of the
High Pickup setting.
The resulting record contains pre-fault and fault data. The channel must return to the
OFF state before it can generate a subsequent trigger.
When set to “Re-Trigger Only” or “Trigger/Re-Trigger,” the disturbance recorder is re-
triggered when the magnitude of the signal is greater than the value of the
High Pickup
setting. The resulting record contains fault data only. A re-trigger is generated again at
the end of a disturbance record if the magnitude is greater than the
High Pickup and if
the number of re-triggers is less than the
Maximum Re-Trigger setting.
Note that only phasor magnitudes, RMS magnitudes, frequency, and power can be used
as analog triggers.
High Pickup
Range: 0.0 to 1000000.0 in steps of 0.1
Default: 1000.0
This setting specifies the magnitude of the signal required to produce a trigger or re-
trigger. This setting is expressed in primary values. The units depend on the value of the
Available Signals setting.
Low Triggering
Range: Off, Trigger Only, Trigger/Re-Trigger, Re-Trigger Only
Default: Off
This setting selects the low triggering function for the analog channel. When set to
“Trigger Only” or “Trigger/Re-Trigger,” the disturbance recorder initiates data capture
when the magnitude of the signal is less than the value of the
Low Pickup setting. The
resulting record contains both pre-fault and fault data. The channel must return to the
off state before it can generate a subsequent trigger.
When set to “Trigger/Re-Trigger” or “Trigger Only,” the disturbance recorder is re-
triggered when the magnitude of the signal is less than the value of the
Low Pickup
setting. The resulting disturbance record contains fault data only. A re-trigger is
generated again at the end of the record if the magnitude is less than the
Low Pickup
and if the number of re-triggers is less than the Maximum Re-Trigger setting.
Note that only phasor magnitudes, RMS magnitudes, frequency, and power can be used
as analog triggers.
Low Pickup
Range: 0.0 to 1000000.0 in steps of 0.1
Default: 1000.0
This setting specifies the magnitude of the signal required to produce a trigger or re-
trigger. This setting is expressed in primary values. The units depends on the value of the
Available Signals setting.
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