Setting Guidelines - ABB REL670 2.2 IEC Applications Manual

1MRK 506 369-UEN B
24.13.2
24.13.2.1
Line distance protection REL670 2.2 IEC
Application manual
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.

Setting guidelines

All the parameters related to time are divided into two categories: System time and
Synchronization.
System time
The time is set with years, month, day, hour, minute, second and millisecond.
Section 24
Basic IED functions
IP15089-1 v3
M11348-119 v6
871