time synchronization source. Or if GPS and SNTP are selected, when the GPS signal
quality is bad, the IED will automatically choose SNTP as the time-source.
If PTP is activated, the device with the best accuracy within the synchronizing group will
be selected as the source. For more information about PTP, see the Technical manual.
IEEE 1588 (PTP)
PTP according to IEEE 1588-2008 and specifically its profile IEC/IEEE 61850-9-3 for
power utility automation is a synchronization method that can be used to maintain a
common time within a station. This time can be synchronized to the global time using, for
instance, a GPS receiver. If PTP is enabled on the IEDs and the switches that connect the
station are compatible with IEEE 1588, the station will become synchronized to one
common time with an accuracy of under 1us. Using an IED as a boundary clock between
several networks will keep 1us accuracy on three levels or when using an HSR, 15 IEDs
can be connected in a ring without losing a single microsecond in accuracy.
24.13.2 Setting guidelines
All the parameters related to time are divided into two categories: System time and
Synchronization.
24.13.2.1 System time
The time is set with years, month, day, hour, minute, second and millisecond.
24.13.2.2 Synchronization
The setting parameters for the real-time clock with external time synchronization are set
via local HMI or PCM600. The path for Time Synchronization parameters on local HMI is
Main menu/Configuration/Time/Synchronization. The parameters are categorized as
Time Synchronization (TIMESYNCHGEN) and IRIG-B settings (IRIG-B:1) in case that
IRIG-B is used as the external time synchronization source.
TimeSynch
When the source of the time synchronization is selected on the local HMI, the parameter
is called TimeSynch. The time synchronization source can also be set from PCM600. The
setting alternatives are:
FineSyncSource which can have the following values:
• Disabled
• SPA
• LON
• BIN (Binary Minute Pulse)
• GPS
1MRK 506 369-UUS - Section 24
Basic IED functions
Line distance protection REL670 2.2 ANSI 911
Application manual
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