ABB ret650, Applications Manual

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can be compared with each other. With time synchronization, events and
disturbances within the whole network, can be compared and evaluated.
In the IED, the internal time can be synchronized from the following sources:
• BIN (Binary Minute Pulse)
• DNP
• IEC103
• SNTP
• IRIG-B
• SPA
• LON
• PPS
• IEEE 1588 (PTP)
Out of these, LON and SPA contains two types of synchronization messages:
• Coarse time messages are sent every minute and contain complete date and
time, that is year, month, day, hour, minute, second and millisecond.
• Fine time messages are sent every second and comprise only seconds and
milliseconds.
The selection of the time source is done via the corresponding setting.
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.
18.12.2 Setting guidelines
IP15089-1 v3
All the parameters related to time are divided into two categories: System time and
Synchronization.
18.12.2.1 System time
M11348-119 v5
The time is set with years, month, day, hour, minute, second and millisecond.
1MRK 504 169-UEN A
Section 18
Basic IED functions
Transformer protection RET650 2.2 IEC 355
Application manual