GE L90 Instruction Manual page 244

5.4 SYSTEM SETUP
h) VOLTAGE TRIGGERING
PATH: SETTINGS SYSTEM SETUP
PMU 1 VOLTAGE
TRIGGER
This element responds to abnormal voltage. Separate thresholds are provided for low and high voltage. In terms of signal-
5
ing its operation, the element does not differentiate between the undervoltage and overvoltage events. The trigger
responds to the phase voltage signal of the phasor measurement unit (PMU) source. All voltage channels (A, B, and C or
AB, BC, and CA) are processed independently and could 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.
• PMU 1 VOLT TRIGGER LOW-VOLT: This setting specifies the low threshold for the abnormal voltage trigger, in per-
unit of the PMU source. 1 pu is a nominal voltage value defined as the nominal secondary voltage times VT ratio. The
comparator applies a 3% hysteresis.
• PMU 1 VOLT TRIGGER HIGH-VOLT: This setting specifies the high threshold for the abnormal voltage trigger, in per-
unit of the PMU source. 1 pu is a nominal voltage value defined as the nominal secondary voltage times VT ratio. The
comparator applies a 3% hysteresis.
• PMU 1 VOLT TRIGGER PKP TIME: This setting could be used to filter out spurious conditions and avoid unnecessary
triggering of the recorder.
• PMU 1 VOLT TRIGGER DPO TIME: This setting could be used to extend the trigger after the situation returned to nor-
mal. This setting is of particular importance when using the recorder in the forced mode (recording as long as the trig-
gering condition is asserted).
5-98
PHASOR MEASUREMENT...
PMU 1 VOLT TRIGGER
FUNCTION: Disabled
PMU 1 VOLT TRIGGER
MESSAGE
LOW-VOLT: 0.800 pu
PMU 1 VOLT TRIGGER
MESSAGE
HIGH-VOLT: 1.200 pu
PMU 1 VOLT TRIGGER
MESSAGE
PKP TIME: 0.10 s
PMU 1 VOLT TRIGGER
MESSAGE
DPO TIME: 1.00 s
PMU 1 VOLT TRIG BLK:
MESSAGE
Off
PMU 1 VOLT TRIGGER
MESSAGE
TARGET: Self-Reset
PMU 1 VOLT TRIGGER
MESSAGE
EVENTS: Disabled
L90 Line Current Differential System
PMU 1 TRIGGERING PMU 1 VOLTAGE TRIGGER
Range: Enabled, Disabled
Range: 0.250 to 1.250 pu in steps of 0.001
Range: 0.750 to 1.750 pu in steps of 0.001
Range: 0.00 to 600.00 s in steps of 0.01
Range: 0.00 to 600.00 s in steps of 0.01
Range: FlexLogic™ operand
Range: Self-Reset, Latched, Disabled
Range: Enabled, Disabled
5 SETTINGS
GE Multilin