Voltage Triggering; Frequency Trigger Scheme Logic - GE T60 Instruction Manual

5.4 SYSTEM SETUP
The trigger responds to the frequency signal of the phasor measurement unit (PMU) source. The frequency is calculated
from among phase voltages, auxiliary voltage, phase currents and ground current, in this hierarchy, depending on the
source configuration as per T60 standards. This element requires that the frequency be above the minimum measurable
value. If the frequency is below this value, such as when the circuit is de-energized, the trigger drops out.
• PMU 1 FREQ TRIGGER LOW-FREQ: This setting specifies the low threshold for the abnormal frequency trigger. The
comparator applies a 0.02 Hz hysteresis.
• PMU 1 FREQ TRIGGER HIGH-FREQ: This setting specifies the high threshold for the abnormal frequency trigger. The
5
comparator applies a 0.02 Hz hysteresis.
• PMU 1 FREQ TRIGGER PKP TIME: This setting can be used to filter out spurious conditions and avoid unnecessary
triggering of the recorder.
• PMU 1 FREQ TRIGGER DPO TIME: This setting can 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

PATH: SETTINGS
 PMU 1 VOLTAGE
 TRIGGER
5-146
Figure 5–52: FREQUENCY TRIGGER SCHEME LOGIC

SYSTEM SETUP PHASOR MEASUREMENT...
PMU 1 VOLT TRIGGER
FUNCTION: Disabled
PMU 1 VOLT TRIGGER
MESSAGE
LOW-VOLT: 0.800 pu
PMU 1 VOLT TRIGGER
MESSAGE
HIGH-VOLT: 1.200 pu
PMU 1 VOLT TRIGGER
MESSAGE
PKP TIME: 0.10 s
PMU 1 VOLT TRIGGER
MESSAGE
DPO TIME: 1.00 s
PMU 1 VOLT TRIG BLK:
MESSAGE
Off
PMU 1 VOLT TRIGGER
MESSAGE
TARGET: Self-Reset
PMU 1 VOLT TRIGGER
MESSAGE
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 SETTINGS
GE Multilin