If PTP is activated, the device with the best accuracy within the synchronizinggroup will be selected as the source. For more information about PTP, see theTechnical manual.IEEE 1588 (PTP)PTP according to IEEE 1588-2008 and specifically its profile IEC/IEEE 61850-9-3for power utility automation is a synchronization method that can be used tomaintain a common time within a station. This time can be synchronized to theglobal time using, for instance, a GPS receiver. If PTP is enabled on the IEDs andthe switches that connect the station are compatible with IEEE 1588, the stationwill become synchronized to one common time with an accuracy of under 1us.Using an IED as a boundary clock between several networks will keep 1usaccuracy on three levels or when using an HSR, 15 IEDs can be connected in a ringwithout losing a single microsecond in accuracy.21.12.2 Setting guidelines IP15089-1 v3All the parameters related to time are divided into two categories: System time andSynchronization.21.12.2.1 System time M11348-119 v6The time is set with years, month, day, hour, minute, second and millisecond.21.12.2.2 Synchronization M11348-143 v5The setting parameters for the real-time clock with external time synchronizationare set via local HMI or PCM600. The path for Time Synchronization parameterson local HMI is Main menu/Configuration/Time/Synchronization. Theparameters are categorized as Time Synchronization (TIMESYNCHGEN) andIRIG-B settings (IRIG-B:1) in case that IRIG-B is used as the external timesynchronization source.TimeSynch M11348-167 v17When the source of the time synchronization is selected on the local HMI, theparameter is called TimeSynch. The time synchronization source can also be setfrom PCM600. The setting alternatives are:FineSyncSource can have the following values:• Off• SPA• LON• BIN (Binary Minute Pulse)• SNTP• IRIG-B• PPSSection 21 1MRK 505 393-UEN BBasic IED functions418 Line differential protection RED650 2.2 IECApplication manual
