GE Multilin L30 Line Current Differential System 5-915 SETTINGS 5.4 SYSTEM SETUP5k) DF/DT TRIGGERINGPATH: SETTINGS ÖØ SYSTEM SETUP ÖØ PHASOR MEASUREMENT... ÖØ PMU 1 TRIGGERING ÖØ PMU 1 df/dt TRIGGERThis element responds to frequency rate of change. Separate thresholds are provided for rising and dropping frequency.The trigger responds to the rate of change of frequency (df/dt) of the phasor measurement unit (PMU) source.• PMU 1 df/dt TRIGGER RAISE: This setting specifies the pickup threshold for the rate of change of frequency in theraising direction (positive df/dt). The comparator applies a 3% hysteresis.• PMU 1 df/dt TRIGGER FALL: This setting specifies the pickup threshold for the rate of change of frequency in the fall-ing direction (negative df/dt). The comparator applies a 3% hysteresis.• PMU 1 df/dt TRIGGER PKP TIME: This setting could be used to filter out spurious conditions and avoid unnecessarytriggering of the recorder.• PMU 1 df/dt 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).Figure 5–35: RATE OF CHANGE OF FREQUENCY TRIGGER SCHEME LOGIC PMU 1 df/dt TRIGGERPMU 1 df/dt TRIGGERFUNCTION: DisabledRange: Enabled, DisabledMESSAGE PMU 1 df/dt TRIGGERRAISE: 0.25 Hz/sRange: 0.10 to 15.00 Hz/s in steps of 0.01MESSAGE PMU 1 df/dt TRIGGERFALL: 0.25 Hz/sRange: 0.10 to 15.00 Hz/s in steps of 0.01MESSAGE PMU 1 df/dt TRIGGERPKP TIME: 0.10 sRange: 0.00 to 600.00 s in steps of 0.01MESSAGE PMU 1 df/dt TRIGGERDPO TIME: 1.00 sRange: 0.00 to 600.00 s in steps of 0.01MESSAGE PMU 1 df/dt TRG BLK:OffRange: FlexLogic™ operandMESSAGE PMU 1 df/dt TRIGGERTARGET: Self-ResetRange: Self-Reset, Latched, DisabledMESSAGE PMU 1 df/dt TRIGGEREVENTS: DisabledRange: Enabled, DisabledSETTINGSPMU 1 df/dt TRIGGERFUNCTION:Enabled = 1PMU 1 df/dt TRG BLK:Off = 0SETTINGPMU 1 SIGNALSOURCE:ROCOF, df/dtANDSETTINGSPMU 1 df/dt TRIGGER RAISE:PMU 1 df/dt TRIGGER FALL:df/dt > RAISEOR–df/dt > FALLRUNSETTINGSPMU 1 df/dt TRIGGER PKP TIME:PMU 1 df/dt TRIGGER DPO TIME:tPKPtDPOFLEXLOGIC OPERANDPMU 1 ROCOF TRIGGERFLEXLOGIC OPERANDSPMU 1 VOLT TRIGGERPMU 1 CURR TRIGGERPMU 1 POWER TRIGGERPMU 1 FREQ TRIGGERSETTINGPMU 1 USER TRIGGER:Off = 0OR FLEXLOGIC OPERANDPMU 1 TRIGGEREDto STAT bits ofthe data frame847000A1.CDR
