GE L90 Instruction Manual page 347

CHAPTER 5: SETTINGS
5.5.8.15 Current triggering
SETTINGS  SYSTEM SETUP  PHASOR MEASUREMENT UNIT  PHASOR MEASUREMENT UNIT 1  PMU 1
TRIGGERING  PMU 1 CURRENT TRIGGER
 PMU 1 CURRENT
 TRIGGER
This element responds to elevated current. The trigger responds to the phase current signal of the Phasor Measurement
Unit (PMU) source. All current channel (A, B, and C) are processed independently and can trigger the recorder.
— Specifies the pickup threshold for the overcurrent trigger, in per unit of the PMU source. A
PMU 1 CURR TRIGGER PICKUP
value of 1 pu is a nominal primary current. The comparator applies a 3% hysteresis.
PMU 1 CURR TRIGGER PKP TIME
PMU 1 CURR TRIGGER DPO TIME
importance when using the recorder in the forced mode (recording as long as the triggering condition is asserted).
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
Figure 5-80: Voltage trigger logic
PMU 1 CURR TRIGGER

FUNCTION: Disabled
PMU 1 CURR TRIGGER

PICKUP: 1.800 pu
PMU 1 CURR TRIGGER

PKP TIME: 0.10 s
PMU 1 CURR TRIGGER

DPO TIME: 1.00 s
PMU 1 CURR TRIG BLK:

Off
PMU 1 CURR TRIGGER

TARGET: Self-reset
PMU 1 CURR TRIGGER

EVENTS: Disabled
— Use to filter out spurious conditions and avoid unnecessary triggering of the recorder.
— Use to extend the trigger after the situation returns to normal. This setting is of
Figure 5-81: Current trigger logic
Range: Enabled, Disabled
Range: 0.100 to 30.000 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
SYSTEM SETUP
5
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