GE N60 Instruction Manual page 206

5.4 SYSTEM SETUP
k) DF/DT TRIGGERING

PATH: SETTINGS SYSTEM SETUP
 PMU 1 df/dt
 TRIGGER
This element responds to frequency rate of change. Separate thresholds are provided for rising and dropping frequency.
5
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 5–29: RATE OF CHANGE OF FREQUENCY TRIGGER SCHEME LOGIC
5-88

PHASOR MEASUREMENT...
PMU 1 df/dt TRIGGER
FUNCTION: Disabled
PMU 1 df/dt TRIGGER
MESSAGE
RAISE: 0.25 Hz/s
PMU 1 df/dt TRIGGER
MESSAGE
FALL: 0.25 Hz/s
PMU 1 df/dt TRIGGER
MESSAGE
PKP TIME: 0.10 s
PMU 1 df/dt TRIGGER
MESSAGE
DPO TIME: 1.00 s
PMU 1 df/dt TRG BLK:
MESSAGE
Off
PMU 1 df/dt TRIGGER
MESSAGE
TARGET: Self-Reset
PMU 1 df/dt TRIGGER
MESSAGE
EVENTS: Disabled
SETTINGS
PMU 1 df/dt TRIGGER RAISE:
PMU 1 df/dt TRIGGER FALL:
RUN
df/dt > RAISE
OR
–df/dt > FALL
N60 Network Stability and Synchrophasor Measurement 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 SETTINGS
FLEXLOGIC OPERAND
PMU 1 TRIGGERED
to STAT bits of
the data frame
FLEXLOGIC OPERAND
PMU 1 ROCOF TRIGGER
847000A1.CDR
GE Multilin