GE Digital Energy L30, Инструкция по эксплуатации, Страница: 238 / 644

5-112 L30 Line Current Differential System GE Multilin
5.4 SYSTEM SETUP 5 SETTINGS
5
j) DF/DT TRIGGERING
PATH: SETTINGS
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SYSTEM SETUP

PHASOR MEASUREMENT...
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PMU 1 TRIGGERING
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PMU 1 df/dt TRIGGER
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).
Figure 5–46: RATE OF CHANGE OF FREQUENCY TRIGGER SCHEME LOGIC

PMU 1 df/dt

TRIGGER
PMU 1 df/dt TRIGGER
FUNCTION: Disabled
Range: Enabled, Disabled
MESSAGE
PMU 1 df/dt TRIGGER
RAISE: 0.25 Hz/s
Range: 0.10 to 15.00 Hz/s in steps of 0.01
MESSAGE
PMU 1 df/dt TRIGGER
FALL: 0.25 Hz/s
Range: 0.10 to 15.00 Hz/s in steps of 0.01
MESSAGE
PMU 1 df/dt TRIGGER
PKP TIME: 0.10 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
PMU 1 df/dt TRIGGER
DPO TIME: 1.00 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
PMU 1 df/dt TRG BLK:
Off
Range: FlexLogic operand
MESSAGE
PMU 1 df/dt TRIGGER
TARGET: Self-Reset
Range: Self-Reset, Latched, Disabled
MESSAGE
PMU 1 df/dt TRIGGER
EVENTS: Disabled
Range: Enabled, Disabled
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
AND
SETTINGS
PMU 1 df/dt TRIGGER RAISE:
PMU 1 df/dt TRIGGER FALL:
df/dt > RAISE
OR
–df/dt > FALL
RUN
SETTINGS
PMU 1 df/dt TRIGGER PKP TIME:
PMU 1 df/dt TRIGGER DPO TIME:
t
PKP
t
DPO
FLEXLOGIC OPERAND
PMU 1 ROCOF TRIGGER
FLEXLOGIC OPERANDS
PMU 1 VOLT TRIGGER
PMU 1 CURR TRIGGER
PMU 1 POWER TRIGGER
PMU 1 FREQ TRIGGER
SETTING
PMU 1 USER TRIGGER:
Off = 0
OR
FLEXLOGIC OPERAND
PMU 1 TRIGGERED
to STAT bits of
the data frame
847000A1.CDR