GE F60 Instruction Manual page 243

5 SETTINGS
k) DF/DT TRIGGERING

PATH: SETTINGS SYSTEM SETUP
 PMU 1 df/dt
 TRIGGER
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
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: This setting specifies the pickup threshold for the rate of change of frequency in the
raising 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 unnecessary
triggering 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).
SETTINGS
PMU 1 df/dt TRIGGER
FUNCTION:
Enabled = 1
PMU 1 df/dt TRG BLK:
Off = 0
SETTING
PMU 1 SIGNAL
SOURCE:
ROCOF, df/dt
Figure 5–40: RATE OF CHANGE OF FREQUENCY TRIGGER SCHEME LOGIC
GE Multilin

PHASOR MEASUREMENT...
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
SETTINGS
PMU 1 df/dt TRIGGER RAISE:
PMU 1 df/dt TRIGGER FALL:
RUN
df/dt > RAISE
OR
–df/dt > FALL
F60 Feeder Protection System
 
PMU 1 TRIGGERING PMU 1 df/dt TRIGGER
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
FLEXLOGIC OPERANDS
PMU 1 FREQ TRIGGER
PMU 1 VOLT TRIGGER
PMU 1 CURR TRIGGER
PMU 1 POWER TRIGGER
SETTING
PMU 1 USER TRIGGER:
Off = 0
SETTINGS
PMU 1 df/dt TRIGGER PKP TIME:
PMU 1 df/dt TRIGGER DPO TIME:
t
PKP
t
DPO
5.4 SYSTEM SETUP
FLEXLOGIC OPERAND
PMU 1 TRIGGERED
to STAT bits of
the data frame
FLEXLOGIC OPERAND
PMU 1 ROCOF TRIGGER
847000A1.CDR
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