GE L90 Instruction Manual page 345

CHAPTER 5: SETTINGS
stat bits 3 and 11 stay longer than the individual reset timer, then use the
appropriate elements and FlexLogic. In short, in case of
FlexLogic.
5.5.8.12 User triggering
SETTINGS  SYSTEM SETUP  PHASOR MEASUREMENT UNIT  PHASOR MEASUREMENT UNIT 1  PMU 1
TRIGGERING  PMU 1 USER TRIGGER
 PMU 1 USER
 TRIGGER
The user trigger allows customized triggering logic to be constructed from FlexLogic. The entire triggering logic is refreshed
every two power system cycles.
5.5.8.13 Frequency triggering
SETTINGS  SYSTEM SETUP  PHASOR MEASUREMENT UNIT  PHASOR MEASUREMENT UNIT 1  PMU 1
TRIGGERING  PMU 1 FREQUENCY TRIGGER
 PMU 1 FREQUENCY
 TRIGGER
The trigger responds to the frequency signal of the Phasor Measurement Unit (PMU) source. The frequency is calculated
from among phase voltages, auxiliary voltage, phase currents, and ground current, in this hierarchy, depending on the
source configuration as per L90 standards. This element requires that the frequency be 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
0.02 Hz hysteresis.
PMU 1 FREQ TRIGGER HIGH-FREQ
a 0.02 Hz hysteresis.
PMU 1 FREQ TRIGGER PKP TIME
PMU 1 FREQ TRIGGER DPO TIME
when using the recorder in the forced mode (recording as long as the triggering condition is asserted).
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
USER TRIGGER
PMU 1 USER TRIGGER:

Off
PMU 1 FREQ TRIGGER

FUNCTION: Disabled
PMU 1 FREQ TRIGGER

LOW-FREQ: 49.00 Hz
PMU 1 FREQ TRIGGER

HIGH-FREQ: 61.00 Hz
PMU 1 FREQ TRIGGER

PKP TIME: 0.10 s
PMU 1 FREQ TRIGGER

DPO TIME: 1.00 s
PMU 1 FREQ TRIG BLK:

Off
PMU 1 FREQ TRIGGER

TARGET: Self-reset
PMU 1 FREQ TRIGGER

EVENTS: Disabled
— Specifies the low threshold for the abnormal frequency trigger. The comparator applies a
— Specifies the high threshold for the abnormal frequency trigger. The comparator applies
— 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 importance
setting assigned with
PMU x USER TRIGGER
, the drop-off time needs to be implemented using
Range: FlexLogic operand
Range: Enabled, Disabled
Range: 20.00 to 70.00 Hz in steps of 0.01
Range: 20.00 to 70.00 Hz in steps of 0.01
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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