Phasor Measurement Unit One-Shot - GE L90 Instruction Manual

COMMANDS MENU
PERFORM LAMP TEST
UPDATE ORDER CODE
order code to match. If an update occurs, the following message displays.
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 displays.
— Restarts the relay so that changes to configuration settings can take effect. In most cases, if changes are
REBOOT RELAY
made to the configuration settings these changes do not take effect unless the relay is rebooted.
With the CyberSentry option, the Administrator and Operator roles can initiate the Reboot Relay command.
SERVICE COMMAND
returns all settings to their factory default value. Code "101" is used to clear factory diagnostic information stored in the
non-volatile memory. If a code other than these two is entered, the command is ignored and no action is taken. Various
self-checking diagnostics are performed in the background while the L90 is running, and diagnostic information is stored
on the non-volatile memory from time to time based on the self-checking result. Although the diagnostic information is
cleared before the L90 is shipped from the factory, the user can want to clear the diagnostic information for themselves
under certain circumstances. For example, you clear diagnostic information after replacement of hardware. Once the
diagnostic information is cleared, all self-checking variables are reset to their initial state and diagnostics restart from
scratch.
SAVE VOLATILE DATA
recent as possible instead of relying on the periodic timer to save the data.

7.1.5 Phasor Measurement Unit one-shot

COMMANDS  PMU ONE-SHOT
 COMMANDS
 PMU ONE-SHOT
7
This feature allows pre-scheduling of a PMU measurement at a specific point in time. It can be used to test for accuracy of
the PMU and for manual collection of synchronized measurements through the system, as explained here.
When enabled, the function continuously compares the present time with the pre-set
times match, the function compares the present sequence number of the measured synchrophasors with the pre-set
ONE-SHOT FRACTIONAL SEC
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
configured to drive an output contact and trigger an external measuring device such as a digital scope with the intent to
verify the accuracy of the PMU under test.
With reference to the following figure, the PMU one-shot function (when enabled) controls three FlexLogic operands:
• The
PMU ONE-SHOT EXPIRED
at least 30 seconds past the scheduled one-shot time
7-4
— Turns on all faceplate LEDs and display pixels for a short duration.
— This command causes the relay to scan the backplane for the hardware modules and update the
UPDATING...
PLEASE WAIT
— Performs specific L90 service actions. Presently, there are two service actions available. Code "20511"
— Saves this data to compact flash memory prior to shutdown. This allows the saved data to be as
PMU ONE-SHOT

FUNCTION: Disabled
PMU ONE-SHOT

FRACTIONAL SEC: 0
PMU ONE-SHOT TIME:

2013/06/14 7:58:35
. When the two numbers match, the function freezes the synchrophasor actual values and the
operand indicates that the one-shot operation has been executed, and the present time is
CHAPTER 7: COMMANDS AND TARGETS
Range: Enabled, Disabled
Range: 0 to 99 in steps of 1
Range: YYYY/MM/DD HH:MM:SS
PMU ONE-SHOT TIME
FlexLogic operand. This operand can be
PMU ONE-SHOT OP
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
. When the two
PMU