GE D90 Plus Instruction Manual page 560

Line distance protection system

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PHASOR MEASUREMENT UNIT

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 by the old, uncleared records.

The following set of figures illustrate the concept of memory management via the

Trigger Mode

Figure 482: Memory management in automatic overwrite mode

Figure 483: 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.

LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL

CHAPTER 11: METERING