Phasor Measurement Unit Triggering - GE D90 Plus Instruction Manual

CHAPTER 11: METERING

Phasor measurement unit triggering

PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
D-CH-1 Normal State, D-CH-2 Normal State, D-CH-3 Normal State,..., D-CH-16 Normal
State
Range: On, Off
Default: Off
These settings allow for specifying a normal state for each digital channel. These states
are transmitted in configuration frames to the data concentrator.
Each logical phasor measurement unit (PMU) contains five triggering mechanisms to
facilitate triggering of the associated PMU recorder and 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 can be augmented with a user-programmable trigger. This
trigger can be built freely using programmable logic of the relay. The entire triggering logic
is refreshed once every two power system cycles.
Select the Settings > Metering > Phasor Measurement Unit > Triggering > User
Triggering menu item to open the phasor measurement unit user-programmable trigger
window.
Figure 465: User-programmable trigger configuration setting
The following user-programmable trigger setting is available.
Function
Range: any metering operand or shared operand
Default: OFF
This setting selects an operand to use as a user-specified trigger.
All five triggering functions and the user-programmable trigger are consolidated (ORed)
and connected to the PMU recorder. Each trigger can be programmed to log its operation
into the event recorder. 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 466: STAT bits logic
PHASOR MEASUREMENT UNIT
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