Process Bus Iec/Uca 61850-9-2Le Synchronization - ABB REC670 Applications Manual

Section 23
Basic IED functions
23.13.2.3
596
On the REL, the parameter FineSyncSource (under Configuration/Time/
Synchronization/TIMESYNCHGEN:1/General) is set to "GPS" if there is a
GPS antenna attached.
If the GTM is used as a PPS output only, the FineSynchSource is not set.

Process bus IEC/UCA 61850-9-2LE synchronization

When process bus communication (IEC/UCA 61850-9-2LE protocol) is used, it is
essential that the merging units are synchronized with the hardware time of the IED
(see Technical manual, section Design of the time system (clock synchronization) ).
To achieve this, PTP, PPS or IRIG-B can be used depending of the facilities of the
merging unit.
If the merging unit supports PTP, use PTP. If PTP is used in the IED and the
merging unit is not PTP capable, then synchronize the merging unit from the IED
via a PPS out from the GTM. If PTP is used in the IED and the merging unit
cannot be synchronized from the IED, then use GPS-based clocks to provide PTP
synch as well as sync to the merging unit.
If synchronization of the IED and the merging unit is based on GPS, set the
parameter LostSyncMode to BlockOnLostUTC in order to provide a block of
protection functions whenever the global common time is lost.
If PTP is not used, use the same synchronization method for the HwSyncSrc as the
merging unit provides. For instance, if the merging unit provides PPS as
synchronization, use PPS as HwSyncSrc. If either PMU or LDCM in GPS-mode is
used, that is, the hardware and software clocks are connected to each other,
HwSyncSrc is not used and other means to synchronize the merging unit to the IED
is required. Either FineSyncSource is set to the same source that the merging unit
uses, or the PPS output from the GTM module is used to synchronize the merging
unit. If the PPS output from the GTM module is used to synchronize the merging
unit and PTP is not used, the IED does not know how the merging unit is
synchronized and the parameter LostSyncMode must be set to NoBlock.
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