GE D90 Plus - Page 554

544 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
PHASOR MEASUREMENT UNIT CHAPTER 11: METERING
Dropout Time
Range: 0.00 to 600.00 seconds in steps of 0.01
Default: 1.00 seconds
This setting is used to extend the trigger after the situation returns to normal. This
setting is of particular importance when using the recorder in the forced mode
(recording as long as the triggering condition is asserted).
Block
Range: any metering logic operand or shared operand
Default: Off
Assertion of the operand assigned to this setting blocks operation of the PMU current
triggering function.
Events
Range: Enabled, Disabled
Default: Disabled
This setting enables and disables the logging of PMU current triggering events in the
sequence of events recorder.
The figure shows the logic for the PMU current triggering function.
Figure 475: Current triggering logic
Power triggering
The Phasor Measurement Unit power triggering responds to abnormal power. Separate
thresholds are provided for active, reactive, and apparent powers. In terms of signaling its
operation, the element does not differentiate between the three types of power. The trigger
responds to the single-phase and three-phase power signals of the PMU source.
Select the Settings > Metering > Phasor Measurement Unit > Triggering > Power Trigger
menu to open the PMU power triggering window.
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