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
.
1MRK 505 370-UEN D Section 20
Basic IED functions
Busbar protection REB670 447
Application manual
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