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1MRK 505 370-UEN D
section
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
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,
merging unit to the IED is required. Either
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 .
Busbar protection REB670
Application manual
Design of the time system (clock synchronization ) ). To achieve this, PTP, PPS or IRIG-B
HwSyncSrc is not used and other means to synchronize the
FineSyncSource is set to the same source that the
Section 20
Basic IED functions
HwSyncSrc as the merging
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