• SYNCH signal on the MUx function block indicates that 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 MUx function block monitors the synchronization
flag smpSynch in the datastream and IED hardware time synchronization.
No time synchronization
This example is not valid when GPS time is used for differential
protection or when PTP is enabled.
IEC/UCA 61850-9-2LE
Data
MU
IED
IEC10000075=2=en=Original.vsd
IEC10000075 V2 EN-US
Figure 121: Setting example without time synchronization
It is also possible to use IEC/UCA 61850-9-2LE communication without time
synchronization.
Settings on the local HMI under Main menu/Configuration/Time/
Synchronization/TIMESYNCHGEN:1/IEC61850-9-2:
• HwSyncSrc: set to Off
• SyncLostMode: set to No block to indicate that protection functions are not
blocked
• SyncAccLevel: set to unspecified
Two status monitoring signals with no time synchronization:
1MRK 511 423-UEN A Section 13
Station communication
Bay control REC650 2.2 IEC 251
Application manual
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