• 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
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
MU
data
PPS
IEC/UCA 61850-9-2LE
PPS / IRIG-B
STATION
CLOCK
IEC10000074=2=en=Original.vsd
IEC10000074 V2 EN-US
Figure 414: Setting example with external synchronization
Settings on the local HMI under Main menu/Configuration/Time/
Synchronization/TIMESYNCHGEN:1/IEC61850-9-2:
• HwSyncSrc: set to PPS/IRIG-B depending on available outputs on the clock.
• 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.
• fineSyncSource: should be set to IRIG-B if available from the clock. If PPS is
used for HWSyncSrc , “full-time” has to be acquired from another source. If
station clock is on the local area network (LAN) and has an sntp-server, this is
one option.
Two status monitoring signals can be:
1MRK 506 369-UEN B Section 21
Station communication
Line distance protection REL670 2.2 IEC 825
Application manual
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