ABB Relion 670 Series Applications Manual page 344

Section 22
Basic IED functions
If synchronization of the IED and the merging unit is based on GPS, set the parameter
SyncLostMode 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
provides. For instance, if the merging unit provides PPS as synchronization, use PPS as
If either PMU or LDCM in GPS-mode is used, that is, the hardware and software clocks are
connected to each other,
to the IED is required. Either
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
NoBlock .
338
HwSyncSrc is not used and other means to synchronize the merging unit
FineSyncSource is set to the same source that the merging unit uses,
If the IED is used together with a merging unit and no time synchronization is
available, for example, in the laboratory test, the IED will synchronize to the SV data
stream. During the re-synchronization, the protection functions will be blocked
once a second for about 45 ms, and this will continue for up to 10 minutes. To
avoid this, configure PTP (IEEE 1588) to
unit is configured.
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HwSyncSrc as the merging unit
SyncLostMode must be set to
On for the access point where the merging
Phasor measurement unit RES670
1MRK 511 407-UUS Rev. J
HwSyncSrc .
Application manual