ABB UniGear Series, Engineering Manual

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Since the SMV needs to obtain accurate time synchronization the synchronization method is
to correspond to IEEE 1588, with the PTP priority to be set to correct values. Lower value
means highest priority. Identical time synchronization method is to be used in all SMV
sending and receiving protection relays.
Figure 59: Time parameter setting dialog in PCM600
IED Configuration / Configuration / Time / Parameter Setting / Synchronization
– Synch source = IEEE 1588
– PTP domain ID = 0, only clocks with the same domain are synchronized
– PTP priority 1 = 127...128, the clock with the lowest priority 1 becomes reference clock
(Grandmaster)
– PTP priority 2 = 128...255, if all the relevant values for selecting the reference clock for mul-
tiple devices are the same, the clock with the lowest priority 2 is selected as the reference
clock
– PTP announce mode: Power Profile
It is recommended to set Priority 1 and Priority 2 to be equal to 128 for all protection relays,
except the voltage sender protection relays (Priority 1 = 127, Priority 2 = 128...255 to be differ-
ent for each protection relay). Voltage sender protection relay provides the synchronization
of network time in case Grandmaster clock is not available.