Hitachi Relion 670 Series Applications Manual page 378

Section 18
Station communication
Using MU for time synchronization via PPS
IEC/UCA 61850-9-2LE
IEC10000061 V2 EN-US
Figure 188:
Settings on the local HMI under Main menu/Configuration/Time/Synchronization/
TIMESYNCHGEN:1/IEC61850-9-2:
• HwSyncSrc: set to PPS as generated by the MU (Hitachi Energy MU)
• SyncLostMode : set to Block to block protection functions if time synchronization is lost
• SyncAccLevel: can be set to 4μs since this corresponds to a maximum phase angle error of
0.072 degrees at 50Hz
Settings on the local HMI under Main menu/Configuration/Time/Synchronization/
TIMESYNCHGEN:1/General:
• fineSyncSource can be set to something different to correlate events and data to other IEDs in
the station.
Two status monitoring signals can be:
• SYNCH signal on the MUx function block indicates that protection functions are blocked due to
loss of internal time synchronization to the IED.
• MUSYNCH signal on the MUx function block monitors the synchronization flag smpSynch in the
datastream and IED hardware time synchronization.
SMPLLOST indicates that merging unit data are generated by internal substitution or one/more
channel's Quality is not good or merging unit is in Testmode/detailed quality=Test, IED is not in test
mode.
Using external clock for time synchronization
372
This example is not valid when GPS time is used for differential protection, when PTP is
enabled or when the PMU report is used.
IED
Analog data
MU
Setting example when MU is the synchronizing source
This example is not valid when GPS time is used for differential protection, when PTP is
enabled or when the PMU report is used.
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PPS
Synchronization
IEC10000061=2=en=Original.vsd
1MRK506375-UEN Rev. N
Railway application RER670
Application manual