GE Multilin N60 Network Stability and Synchrophasor Measurement System 7-37 COMMANDS AND TARGETS 7.1 COMMANDS77.1.5 RELAY MAINTENANCEPATH: COMMANDS ÖØ RELAY MAINTENANCEThis menu contains commands for relay maintenance purposes. Commands are activated by changing a command settingto “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 UPDATEORDER CODE command causes the relay to scan the backplane for the hardware modules and update the order code tomatch. 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 ORDERCODE NOT UPDATED message will be shown.7.1.6 PHASOR MEASUREMENT UNIT ONE-SHOTPATH: COMMANDS ÖØ PMU ONE-SHOTThis feature allows pre-scheduling a PMU measurement at a specific point in time. This functionality can be used to test foraccuracy 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 twotimes match, the function compares the present sequence number of the measured synchrophasors with the pre-set PMUONE-SHOT SEQUENCE NUMBER. When the two numbers match, the function freezes the synchrophasor actual values andthe 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 orDNP, 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 beconfigured 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 timeis 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 isbefore 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 MAINTENANCEPERFORM LAMPTEST?NoRange: No, YesUPDATE ORDER CODE?NoRange: No, YesUPDATING...PLEASE WAIT COMMANDS PMU ONE-SHOTPMU ONE-SHOTFUNCTION: DisabledRange: Enabled, DisabledPMU ONE-SHOTSEQUENCE NUMBER: 0Range: 0 to nominal frequency – 1 in steps of 1PMU ONE-SHOT TIME:2005/06/14 7:58:35Range: 24h time format
