ABB Relion 670 Series Applications Manual page 601

1MRK 511 401-UEN Rev. K
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
• GPS
• IEC103
• SNTP
• IRIG-B
• SPA
• LON
• PPS
• IEEE 1588 (PTP)
For IEDs using PMU functionality, only PTP, GPS or IRIG-B or a combination of both GPS and
IRIG-B is allowed.
For IEDs using IEC/UCA 61850-9-2LE in "mixed mode" a time synchronization from an external
clock is recommended to the IED and all connected merging units. The time synchronization
from the clock to the IED can be PTP, optical PPS or IRIG-B. For IEDs using IEC/UCA
61850-9-2LE from one single MU as analog data source, the MU and IED still need to be
synchronized to each other. This could be done by letting the MU supply a PPS signal to the IED
or by supplying a PPS signal from the IED to the MU, by using a GTM.
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.
It is possible to select more than one time source, in which case one is backup for the other.
The time synchronization source with the best calculated time-quality is automatically
selected. For instance, if both GPS and IRIG-B are selected and both sources have the required
accuracy, optical IRIG-B with IEEE1344 will be automatically selected as the 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.
Bay control REC670
Application manual
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Section 24
Basic IED functions
IP15089-1 v3
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