516 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
TRANSIENT RECORDER CHAPTER 10: DIGITAL FAULT RECORDER
Trigger Position
Range: 1 to 100% in steps of 1
Default: 50%
This setting specifies the amount of pre-trigger data stored in a record expressed as a
percentage of record length.
Maximum Re-Triggers
Range: 1 to 4 in steps of 1
Default: 2
This setting selects the maximum number of re-trigger records that can be generated
for an event. The value is limited to one less than the number of records that can be
stored (up to a maximum of four records).
Sample Rate
Range: 16, 32, 64, 128, or 256 samples per cycle, or OFF
Default: 32
This setting selects the time-resolution of the transient record. A larger setting
necessarily results in a shorter record length.
Block Trigger
Range: any FlexLogic operand or shared operand
Default: OFF
When the operand assigned to this setting is asserted, all triggers to the transient
recorder are inhibited.
NOTE:
When changes are made to the transient recorder settings, all existing transient records
are cleared.
NOTE:
The transient recorder starts collecting data upon power up or after the recorder is
cleared. If a trigger occurs immediately after a power up or the clearing of transient
records, and there is not enough pre-trigger data, then the pre-trigger is set to the amount
of data collected and does not reflect the value specified by the user.
.
The figure shows the transient recorder trigger logic.
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