GE D90 Plus Instruction Manual page 269

Line distance protection system

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CHAPTER 7: PROTECTION

LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL

Range: Phase to Ground, Phase to Phase

Default: Phase to Ground

This setting selects the operating mode. Select phase-to-ground or phase-to-phase for

wye VT connections, or phase-to-phase for delta VT connections.

Range: 0.000 to 1.100 pu in steps of 0.001

Default: 1.000 pu

This setting specifies the phase undervoltage pickup level in per-unit values.

Range: Definite Time, Inverse Time

Default: Definite Time

This setting selects the desired time-delay operating characteristic versus the applied

fundamental voltage or the definite time element.

Range: 0.00 to 600.00 seconds in steps of 0.01

Default: 1.00 seconds

This setting specifies the minimum operating time of the phase undervoltage element.

Minimum Voltage

Range: 0.000 to 3.000 pu in steps of 0.001

Default: 0.100 pu

This setting specifies the operating voltage in per-unit values below which the element is

blocked. A value of "0" will allow a dead source to be considered a fault condition.

Range: any FlexLogic™ operand or shared operand

Default: Off

Assertion of the operand assigned to this setting blocks the phase undervoltage

Range: Enabled, Disabled

Default: Disabled

This setting enables and disables the logging of phase undervoltage events in the

sequence of events recorder.

The logic for the phase undervoltage element is shown below. The logic is identical for all

phase undervoltage elements.

GROUPED PROTECTION ELEMENTS