GE D90 Plus Instruction Manual page 474

Line distance protection system

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DISTURBANCE 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 disturbance record

expressed as a percentage of the disturbance record length.

Maximum Re-Triggers

Range: 1 to 4 in steps of 1

This setting selects the maximum number of re-trigger records that can be generated

for a disturbance event. The value is limited to one less than the number of records that

can be stored (up to a maximum of four records).

Block Trigger

Range: any FlexLogic™ operand or shared operand

Default: OFF

When the operand assigned to this setting is asserted, all triggers to the disturbance

recorder are inhibited.

When changes are made to the disturbance recorder settings, all existing disturbance

records will be cleared.

The disturbance recorder will start collecting data upon power up or after the recorder is

cleared. If a trigger occurs immediately after a power up or the clearing of disturbance

records, and there is not enough pre-trigger data, then the pre-trigger will be set to the

amount of data collected and will not reflect the value specified by the user.

Figure 391: Disturbance recorder trigger logic

CHAPTER 10: DIGITAL FAULT RECORDER

LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL