GE t60 Instruction Manual page 250

5.4 SYSTEM SETUP
All five triggering functions and the user-definable condition are consolidated (ORed) and connected to the PMU recorder.
Each trigger can be programmed to log its operation into the event recorder, and to signal its operation via targets. The five
triggers drive the STAT bits of the data frame to inform the destination of the synchrophasor data regarding the cause of
trigger. The following convention is adopted to drive bits 11, 3, 2, 1, and 0 of the STAT word.
e) USER TRIGGERING

PATH: SETTINGS SYSTEM SETUP
 PMU 1 USER
 TRIGGER
The user trigger allows customized triggering logic to be constructed from FlexLogic™. The entire triggering logic is
refreshed once every two power system cycles.
f) FREQUENCY TRIGGERING
5

PATH: SETTINGS SYSTEM SETUP
 PMU 1 FREQUENCY
 TRIGGER
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.
5-126
Figure 5–48: STAT BITS LOGIC

PHASOR MEASUREMENT...
PMU1 USER TRIGGER:
Off

PHASOR MEASUREMENT...
PMU 1 FREQ TRIGGER
FUNCTION: Disabled
PMU 1 FREQ TRIGGER
MESSAGE
LOW-FREQ: 49.00 Hz
PMU 1 FREQ TRIGGER
MESSAGE
HIGH-FREQ: 61.00 Hz
PMU 1 FREQ TRIGGER
MESSAGE
PKP TIME: 0.10 s
PMU 1 FREQ TRIGGER
MESSAGE
DPO TIME: 1.00 s
PMU 1 FREQ TRIG BLK:
MESSAGE
Off
PMU 1 FREQ TRIGGER
MESSAGE
TARGET: Self-Reset
PMU 1 FREQ TRIGGER
MESSAGE
EVENTS: Disabled
T60 Transformer Protection System
 
PMU 1 TRIGGERING PMU 1 USER TRIGGER
Range: FlexLogic™ operands
 
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 SETTINGS
GE Multilin