ABB Relion 670 Series Applications Manual page 583

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1MRK 511 401-UUS F

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

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Application manual

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.

HwSyncSrc as the merging unit

SyncLostMode must be set to

On for the access point where the merging

Basic IED functions