GE Multilin
N60 Network Stability and Synchrophasor Measurement System
7-3
7 COMMANDS AND TARGETS
7.1 COMMANDS
7
7.1.5 RELAY MAINTENANCE
PATH: COMMANDS
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RELAY MAINTENANCE
This menu contains commands for relay maintenance purposes. Commands are activated by changing a command setting
to “Yes” and pressing the ENTER key. The command setting will then automatically revert to “No”.
The
PERFORM LAMPTEST
command turns on all faceplate LEDs and display pixels for a short duration. The
UPDATE
ORDER CODE
command causes the relay to scan the backplane for the hardware modules and update the order code to
match. If an update occurs, the following message is shown.
There is no impact if there have been no changes to the hardware modules. When an update does not occur, the
ORDER
CODE NOT UPDATED
message will be shown.
7.1.6 PHASOR MEASUREMENT UNIT ONE-SHOT
PATH: COMMANDS
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PMU ONE-SHOT
This feature allows pre-scheduling a PMU measurement at a specific point in time. This functionality can be used to test for
accuracy of the PMU, and for manual collection of synchronized measurements through the system, as explained below.
When enabled, the function continuously compares the present time with the pre-set
PMU ONE-SHOT TIME
. When the two
times match, the function compares the present sequence number of the measured synchrophasors with the pre-set
PMU
ONE-SHOT SEQUENCE NUMBER
. When the two numbers match, the function freezes the synchrophasor actual values and
the corresponding protocol data items for 30 seconds. This allows manual read-out of the synchrophasor values for the pre-
set time and pre-set sequence number (via the faceplate display, supported communication protocols such as Modbus or
DNP, and the EnerVista UR Setup software).
When freezing the actual values the function also asserts a
PMU ONE-SHOT OP
FlexLogic™ operand. This operand may be
configured to drive an output contact and trigger an external measuring device such as a digital scope with the intent to ver-
ify the accuracy of the PMU under test.
With reference to the figure below, the PMU one-shot function (when enabled) controls three FlexLogic™ operands:
•
The
PMU ONE-SHOT EXPIRED
operand indicates that the one-shot operation has been executed, and the present time
is at least 30 seconds past the scheduled one-shot time.
•
The
PMU ONE-SHOT PENDING
operand indicates that the one-shot operation is pending; that is, the present time is
before the scheduled one-shot time.
•
The
PMU ONE-SHOT OP
operand indicates the one-shot operation and remains asserted for 30 seconds afterwards.
COMMANDS
RELAY MAINTENANCE
PERFORM LAMPTEST?
No
Range: No, Yes
UPDATE ORDER CODE?
No
Range: No, Yes
UPDATING...
PLEASE WAIT
COMMANDS
PMU ONE-SHOT
PMU ONE-SHOT
FUNCTION: Disabled
Range: Enabled, Disabled
PMU ONE-SHOT
SEQUENCE NUMBER: 0
Range: 0 to nominal frequency – 1 in steps of 1
PMU ONE-SHOT TIME:
2005/06/14 7:58:35
Range: 24h time format
