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5 SETTINGS
g) FREQUENCY TRIGGERING
PATH: SETTINGS
SYSTEM SETUP
PMU 1 FREQUENCY
TRIGGER
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
The trigger responds to the frequency signal of the phasor measurement unit (PMU) source. The frequency is calculated
from either phase voltages, auxiliary voltage, phase currents and ground current, in this hierarchy, depending on the source
configuration as per T60 standards. This element requires the frequency is above the minimum measurable value. If the
frequency is below this value, such as when the circuit is de-energized, the trigger will drop out.
•
PMU 1 FREQ TRIGGER LOW-FREQ: This setting specifies the low threshold for the abnormal frequency trigger. The
comparator applies a 0.03 Hz hysteresis.
•
PMU 1 FREQ TRIGGER HIGH-FREQ: This setting specifies the high threshold for the abnormal frequency trigger. The
comparator applies a 0.03 Hz hysteresis.
•
PMU 1 FREQ TRIGGER PKP TIME: This setting could be used to filter out spurious conditions and avoid unnecessary
triggering of the recorder.
•
PMU 1 FREQ 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 FREQ TRIGGER
FUNCTION:
Enabled = 1
PMU 1 FREQ TRIG BLK:
Off = 0
SETTING
PMU 1 SIGNAL
SOURCE:
FREQUENCY, f
GE Multilin
PHASOR MEASUREMENT...
PMU 1 FREQ TRIGGER
FUNCTION: Disabled
PMU 1 FREQ TRIGGER
LOW-FREQ: 49.00 Hz
PMU 1 FREQ TRIGGER
HIGH-FREQ: 61.00 Hz
PMU 1 FREQ TRIGGER
PKP TIME: 0.10 s
PMU 1 FREQ TRIGGER
DPO TIME: 1.00 s
PMU 1 FREQ TRIG BLK:
Off
PMU 1 FREQ TRIGGER
TARGET: Self-Reset
PMU 1 FREQ TRIGGER
EVENTS: Disabled
SETTINGS
PMU 1 FREQ TRIGGER LOW-FREQ:
PMU 1 FREQ TRIGGER HIGH-FREQ:
RUN
0< f < LOW-FREQ
OR
f > HIGH-FREQ
Figure 5–39: FREQUENCY TRIGGER SCHEME LOGIC
T60 Transformer Protection System
PMU 1 TRIGGERING
PMU 1 FREQUENCY TRIGGER
Range: Enabled, Disabled
Range: 20.00 to 70.00 Hz in steps of 0.01
Range: 20.00 to 70.00 Hz 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 VOLT TRIGGER
PMU 1 CURR TRIGGER
PMU 1 POWER TRIGGER
PMU 1 ROCOF TRIGGER
SETTING
PMU 1 USER TRIGGER:
Off = 0
SETTINGS
PMU 1 FREQ TRIGGER PKP TIME:
PMU 1 FREQ 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 FREQ TRIGGER
847002A2.CDR
5-111
5
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