GE D90 Plus Instruction Manual page 551

Line distance protection system

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CHAPTER 11: METERING

Voltage triggering

LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL

Range: any metering logic operand or shared operand

Default: Off

Assertion of the operand assigned to this setting blocks operation of the PMU frequency

triggering function.

Range: Enabled, Disabled

Default: Disabled

This setting enables and disables the logging of PMU frequency triggering events in the

sequence of events recorder.

The figure shows the logic for the PMU frequency triggering function.

Figure 471: Frequency triggering logic

This Phasor Measurement Unit voltage triggering responds to abnormal voltage. Separate

thresholds are provided for low and high voltage. In terms of signaling its operation, the

element does not differentiate between the undervoltage and overvoltage events. The

trigger responds to the phase voltage signal of the PMU source. All voltage channels (A, B,

and C or AB, BC, and CA) are processed independently and can trigger the recorder. A

minimum voltage supervision of 0.1 pu is implemented to prevent pickup on a de-

energized circuit, similarly to the undervoltage protection element.

Select the Settings > Metering > Phasor Measurement Unit > Triggering > Voltage

Trigger menu to open the PMU voltage triggering window.

Figure 472: Voltage triggering configuration settings

The following settings are available for each PMU.

PHASOR MEASUREMENT UNIT