GE L30 Instruction Manual page 257

5 SETTINGS
The trigger responds to the frequency signal of the phasor measurement unit (PMU) source. The frequency is calculated
from either phase voltages, auxiliary voltage, phase currents and ground current, in this hierarchy, depending on the source
configuration as per L30 standards. This element requires the frequency is above the minimum measurable value. If the
frequency is below this value, such as when the circuit is de-energized, the trigger drops out.
• PMU 1 FREQ TRIGGER LOW-FREQ: This setting specifies the low threshold for the abnormal frequency trigger. The
comparator applies a 0.02 Hz hysteresis.
• PMU 1 FREQ TRIGGER HIGH-FREQ: This setting specifies the high threshold for the abnormal frequency trigger. The
comparator applies a 0.02 Hz hysteresis.
• PMU 1 FREQ TRIGGER PKP TIME: This setting could be used to filter out spurious conditions and avoid unnecessary
triggering of the recorder.
• PMU 1 FREQ 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).
g) VOLTAGE TRIGGERING

PATH: SETTINGS SYSTEM SETUP
 PMU 1 VOLTAGE
 TRIGGER
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
GE Multilin
Figure 5–44: FREQUENCY TRIGGER SCHEME LOGIC

PHASOR MEASUREMENT...
PMU 1 VOLT TRIGGER
FUNCTION: Disabled
PMU 1 VOLT TRIGGER
LOW-VOLT: 0.800 pu
PMU 1 VOLT TRIGGER
HIGH-VOLT: 1.200 pu
PMU 1 VOLT TRIGGER
PKP TIME: 0.10 s
PMU 1 VOLT TRIGGER
DPO TIME: 1.00 s
PMU 1 VOLT TRIG BLK:
Off
PMU 1 VOLT TRIGGER
TARGET: Self-Reset
PMU 1 VOLT TRIGGER
EVENTS: Disabled
L30 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
5.4 SYSTEM SETUP
5
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