• HwSyncSrc: set to PPS since this is what is generated by the MU (ABB MU)
• AppSynch : set to Synch, since protection functions should be blocked in case of
loss of timesynchronization
• SyncAccLevel: could be set to 4us since this corresponds to a maximum phase-
angle error of 0.072 degrees at 50Hz
• fineSyncSource could still be set to something different in order to correlate events
and data to other IED’s in the station
Settings in PST in PCM600 under: Hardware/Analog modules/Merging units/MU01
• SyncMode : set to Operation. This means that the IED will be blocked if the MU
loose time synchronization. Since the MU is set as Time-master, this is unlikely to
happen so the setting of SyncMode is not important in this case
There are 3 signals that monitors state related to time synchronization:
• TSYNCERR signal on the TIMEERR function block. This signal will go high
whenever internal timeQuality goes above the setting SyncAccLevel (4us in this
case) and this will block the protection functions.. This will happen max 4 seconds
after an interruption of the PPS fiber from the MU (or if the fineSyncSource is lost).
• SYNCH signal on the MU1_4I_4U function block indicates when protection
functions are blocked due to loss of internal time synchronization to the IED (that
is loss of the hardware synchSrc)
• MUSYNCH signal on the MU_4I_4U function block monitor the synchronization
from the MU (in the datastream). When the MU indicates loss of time
synchronization this signal will go high. In this case the MU is set to master so it
can not loose time synchronization.
The SMPLLOSTsignal will of course also be interesting since this indicate blocking
due to missing analog data (interruption of IEC 61850-9-2LE fiber), although this has
nothing to do with time synchronization.
Using an external clock for time synchronization
1MRK504116-UUS C Section 4
Station communication
825
Application manual
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