GE D90 Plus Instruction Manual page 498

PHASOR MEASUREMENT UNIT
490
Trigger Mode
Range: Automatic Overwrite, Protected
Default: Automatic Overwrite
This setting specifies what happens when the recorder uses its entire available memory
storage. If set to "Automatic Overwrite", the last record is erased to facilitate new
recording, when triggered. If set to "Protected", the recorder stops creating new records
when the entire memory is used up by the old un-cleared records.
The following set of figures illustrate the concept of memory management via the
setting.
Trigger Mode
Figure 416: Memory management in automatic overwrite mode
Figure 417: Memory management in protected mode
Timed Trigger Position
Range: 1 to 50% in steps of 1
Default: 10%
This setting specifies the amount of pre-trigger data in percent of the entire record. This
setting applies only to the timed mode of recording.
Rec PHS-1, Rec PHS-2, Rec PHS-3,..., Rec PHS-14
Range: available synchrophasor values
Default: Off
These settings specify synchrophasors to be recorded from the superset of all
synchronized measurements as indicated in the following table. These settings allow for
optimizing the record size and content depending on a given application. Select "Off" to
suppress recording of a given value.
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 11: METERING