GE t60 Instruction Manual page 251

5 SETTINGS
• 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).
g) VOLTAGE TRIGGERING
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PATH: SETTINGS SYSTEM SETUP
 PMU 1 VOLTAGE
 TRIGGER
MESSAGE
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MESSAGE
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MESSAGE
This element responds to abnormal voltage. Separate thresholds are provided for low and high voltage. In terms of signal-
ing its operation, the element does not differentiate between the undervoltage and overvoltage events. The trigger
responds to the phase voltage signal of the phasor measurement unit (PMU) source. All voltage channels (A, B, and C or
AB, BC, and CA) are processed independently and could trigger the recorder. A minimum voltage supervision of 0.1 pu is
implemented to prevent pickup on a de-energized circuit, similarly to the undervoltage protection element.
• PMU 1 VOLT TRIGGER LOW-VOLT: This setting specifies the low threshold for the abnormal voltage trigger, in per-
unit of the PMU source. 1 pu is a nominal voltage value defined as the nominal secondary voltage times VT ratio. The
comparator applies a 3% hysteresis.
GE Multilin
Figure 5–49: FREQUENCY TRIGGER SCHEME LOGIC

PHASOR MEASUREMENT...
PMU 1 VOLT TRIGGER
FUNCTION: Disabled
PMU 1 VOLT TRIGGER
LOW-VOLT: 0.800 pu
PMU 1 VOLT TRIGGER
HIGH-VOLT: 1.200 pu
PMU 1 VOLT TRIGGER
PKP TIME: 0.10 s
PMU 1 VOLT TRIGGER
DPO TIME: 1.00 s
PMU 1 VOLT TRIG BLK:
Off
PMU 1 VOLT TRIGGER
TARGET: Self-Reset
PMU 1 VOLT TRIGGER
EVENTS: Disabled
T60 Transformer Protection System
 
PMU 1 TRIGGERING PMU 1 VOLTAGE TRIGGER
Range: Enabled, Disabled
Range: 0.250 to 1.250 pu in steps of 0.001
Range: 0.750 to 1.750 pu in steps of 0.001
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
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