GE Multilin G60 Generator Protection System 7-57 COMMANDS AND TARGETS 7.1 COMMANDS7sured signals are raw inputs to the PMU under test, their independently captured record, processed using third-party soft-ware, is a good reference point for accuracy calculations. Such a record proves useful when discussing the test results, andshould be retained as a part of the testing documentation.Note that the PMU under such test does not have to be connected to a real GPS receiver as the accuracy is measured withrespect to the timing reference provided to the PMU and not to the absolute UTC time. Therefore a simple IRIG-B genera-tor could be used instead. Also, the test set does not have to support GPS synchronization. Any stable signal source canbe used. If both the PMU under test and the test set use the timing reference, they should be driven from the same IRIG-Bsignal: either the same GPS receiver or IRIG-B generator. Otherwise, the setpoints of the test set and the PMU measure-ments should not be compared as they are referenced to different time scales.Figure 7–2: USING THE PMU ONE-SHOT FEATURE TO TEST SYNCHROPHASOR MEASUREMENT ACCURACYCOLLECTING SYNCHRONIZED MEASUREMENTS AD HOC:The one-shot feature can be used for ad hoc collection of synchronized measurements in the network. Two or more PMUcan be pre-scheduled to freeze their measurements at the same time. When frozen the measurements could be collectedusing EnerVista UR Setup or a protocol client.7.1.7 SECURITYiPATH: COMMANDS SECURITYWith the CyberSentry option, this setting is available to enable or disable the following commands:• Administrator Logoff: Selecting ‘Yes’ allows the Supervisor to forcefully logoff an administrator session.• Engineer Logoff: Selecting ‘Yes’ allows the Supervisor to forcefully logoff an engineer session.• Operator Logoff: Selecting ‘Yes’ allows the Supervisor to forcefully logoff an operator session.• Clear Security Data: Selecting ‘Yes’ allows the Supervisor to forcefully clear all the security logs and clears all theoperands associated with the self-tests. SECURITYADMINISTRATORLOGOFF: NoRange: Yes, NoDefault: NoENGINEERLOGOFF: NoRange: Yes, NoDefault: NoOPERATORLOGOFF: NoRange: Yes, NoDefault: NoCLEAR SECURITY DATA: Range: Yes, NoDefault: No
