GE D90 Plus Instruction Manual page 534

PHASOR MEASUREMENT UNIT
524
Function
Range: Enabled, Disabled
Default: Disabled
This setting enables and disables the phasor measurement unit voltage triggering
function.
Low Voltage
Range: 0.250 to 1.250 pu in steps of 0.001
Default: 0.800 pu
This setting specifies the low threshold for the abnormal voltage trigger, in per-unit
values of the phasor measurement unit source. A value of 1 pu is a nominal voltage
value defined as the nominal secondary voltage times VT ratio. The comparator applies
a 3% hysteresis.
High Voltage
Range: 0.750 to 1.750 pu in steps of 0.001
Default: 1.200 pu
This setting specifies the high threshold for the abnormal voltage trigger, in per-unit
values of the phasor measurement unit source. A value of 1 pu is a nominal voltage
value defined as the nominal secondary voltage times VT ratio. The comparator applies
a 3% hysteresis.
Pickup Time
Range: 0.00 to 600.00 seconds in steps of 0.01
Default: 0.10 seconds
This setting may be used to filter out spurious conditions and avoid unnecessary
triggering of the recorder.
Dropout Time
Range: 0.00 to 600.00 seconds in steps of 0.01
Default: 1.00 seconds
This setting may be used to extend the trigger after the situation returned 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 phasor
measurement unit voltage triggering function.
Events
Range: Enabled, Disabled
Default: Disabled
This setting enables and disables the logging of phasor measurement unit voltage
triggering events in the sequence of events recorder.
The logic for the phasor measurement unit voltage triggering function is shown below.
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 11: METERING