GE N60 Instruction Manual page 369

CHAPTER 5: SETTINGS
Each Phasor Measurement Unit (PMU) contains five triggering mechanisms to facilitate triggering of the associated PMU
recorder, or cross-triggering of other PMUs in the system. They are
• Overfrequency and underfrequency
• Overvoltage and undervoltage
• Overcurrent
• Overpower
• High rate of change of frequency
The pre-configured triggers can be augmented with a user-specified condition built freely using programmable logic of the
relay. The entire triggering logic is refreshed once every two power system cycles.
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.
The trigger reset (drop-off) timer is available for all five triggering functions (FREQ, ROCOF, VOLT, CURR, POWER) in individual
trigger settings under the
TRIGGER DPO TIME
operand with stat bits 3 and 11 for a fixed interval defined by this setting. If it is required that
stat bits 3 and 11 stay longer than the individual reset timer, then use the
appropriate elements and FlexLogic. In short, in case of
FlexLogic.
5.5.7.12 User triggering
SETTINGS  SYSTEM SETUP  PHASOR MEASUREMENT UNIT  PHASOR MEASUREMENT UNIT 1(6)  PMU 1(6)
TRIGGERING  PMU 1(6) USER TRIGGER
 PMU 1 USER
 TRIGGER
The user trigger allows customized triggering logic to be constructed from FlexLogic. The entire triggering logic is refreshed
every two power system cycles.
5.5.7.13 Frequency triggering
SETTINGS  SYSTEM SETUP  PHASOR MEASUREMENT UNIT  PHASOR MEASUREMENT UNIT 1(6)  PMU 1(6)
TRIGGERING  PMU 1(6) FREQUENCY TRIGGER
 PMU 1 FREQUENCY
 TRIGGER
N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL
Figure 5-92: STAT bits logic
setting. This asserts individual trigger operand and overall
USER TRIGGER
PMU 1 USER TRIGGER:

Off
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 x TRIGGERED
setting assigned with
PMU x USER TRIGGER
, the drop-off time needs to be implemented using
Range: FlexLogic operand
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
SYSTEM SETUP
5
PMU x TRIGGERED
operand with
5-175