GE UR T60 - Page 248

5-110 T60 Transformer Protection System GE Multilin
5.4 SYSTEM SETUP 5 SETTINGS
5
e) PMU TRIGGERING OVERVIEW
PATH: SETTINGS  SYSTEM SETUP  PHASOR...  PHASOR MEASUREMENT UNIT 1  PMU 1 TRIGGERING
Each logical phasor measurement unit (PMU) contains five triggering mechanisms to facilitate triggering of the associated
PMU recorder, or cross-triggering of other PMUs of the system. They are:
• Overfrequency and underfrequency.
• Overvoltage and undervoltage.
• Overcurrent.
• Overpower.
• High rate of change of frequency.
The pre-configured triggers could 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.
Figure 5–38: STAT BITS LOGIC
f) USER TRIGGERING
PATH: SETTINGS  SYSTEM SETUP  PHASOR MEASUREMENT...  PMU 1 TRIGGERING  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.
 PMU 1
 TRIGGERING
 PMU 1 USER
 TRIGGER
See page 5-110.
MESSAGE
 PMU 1 FREQUENCY
 TRIGGER
See page 5-111.
MESSAGE
 PMU 1 VOLTAGE
 TRIGGER
See page 5-112.
MESSAGE
 PMU 1 CURRENT
 TRIGGER
See page 5-113.
MESSAGE
 PMU 1 POWER
 TRIGGER
See page 5-114.
MESSAGE
 PMU 1 df/dt
 TRIGGER
See page 5-116.
 PMU 1 USER
 TRIGGER
PMU1 USER TRIGGER:
Off
Range: FlexLogic™ operands
847004A1.CDR
FLEXLOGIC OPERANDS
PMU 1 VOLT TRIGGER
PMU 1 CURR TRIGGER
PMU 1 POWER TRIGGER
PMU 1 FREQ TRIGGER
SETTING
PMU 1 USER TRIGGER:
Off=0
OR
FLEXLOGIC OPERAND
PMU 1 TRIGGERED
PMU 1 ROCOF TRIGGER
OR
O
R
bit 0
bit 1
bit 2
bit 3, bit 11
PMU 1 recorder