GE L30 Instruction Manual page 338

SYSTEM SETUP
5.5.8.17 df/dt triggering
SETTINGS  SYSTEM SETUP  PHASOR MEASUREMENT UNIT  PHASOR MEASUREMENT UNIT 1  PMU 1
TRIGGERING  PMU 1 df/dt TRIGGER
 PMU 1 df/dt
 TRIGGER
5
This 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
(positive df/dt). The comparator applies a 4% hysteresis.
PMU 1 df/dt TRIGGER FALL
(negative df/dt). The comparator applies a 4% hysteresis.
PMU 1 df/dt TRIGGER PKP TIME
PMU 1 df/dt TRIGGER DPO TIME
when using the recorder in the forced mode (recording as long as the triggering condition is asserted).
5-160
Figure 5-80: Power trigger logic
PMU 1 df/dt TRIGGER

FUNCTION: Disabled
PMU 1 df/dt TRIGGER

RAISE: 0.25 Hz/s
PMU 1 df/dt TRIGGER

FALL: 0.25 Hz/s
PMU 1 df/dt TRIGGER

PKP TIME: 0.10 s
PMU 1 df/dt TRIGGER

DPO TIME: 1.00 s
PMU 1 df/dt TRG BLK:

Off
PMU 1 df/dt TRIGGER

TARGET: Self-reset
PMU 1 df/dt TRIGGER

EVENTS: Disabled
— Specifies the pickup threshold for the rate of change of frequency in the raising direction
— Specifies the pickup threshold for the rate of change of frequency in the falling direction
— 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
Range: Enabled, Disabled
Range: 0.10 to 15.00 Hz/s in steps of 0.01
Range: 0.10 to 15.00 Hz/s 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
L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS