GE L90 Instruction Manual page 239
Ur series line current differential system
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- Instruction manual (900 pages) ,
- Communications manual (532 pages) ,
- Instruction manual (470 pages)
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5 SETTINGS
f) 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 L90 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).
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
Figure 5–42: FREQUENCY TRIGGER SCHEME LOGIC
L90 Line Current Differential 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
5.4 SYSTEM SETUP
5
5-109
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