ABB Relion REC670 Applications Manual page 425

1MRK 511 358-UEN A
HwSyncSrc : set to PPS/IRIG-B depending on available outputs on the clock
•
• AppSynch : set to Synch , for blocking protection functions in case of loss of time
synchronization
SyncAccLevel : could be set to 4us since this correspond to a maximum phase-angle error
•
of 0.072 degrees at 50Hz
fineSyncSource :should be set to IRIG-B if this is available from the clock. If using PPS for
•
HWSyncSrc , "full-time" has to be acquired from another source. If the station clock is on
the local area network (LAN) and has a sntp-server this is one option.
Settings in PST in PCM600 under: Hardware/Analog modules/Merging units/MU01
• SyncMode : set to Operation . This means that the IED will block if the MU loose time
synchronization.
There are 3 signals that monitors state related to time synchronization:
• TSYNCERR signal on the TIMEERR function block will go high whenever internal
timeQuality goes above the setting SyncAccLevel ( 4us in this case). This will block the
protection functions after maximum 4 seconds after an interruption in the PPS fiber
communication from the MU.
• SYNCH signal on the MU_4I_4U function block indicate that protection functions are
blocked by loss of internal time synchronization to the IED (that is loss of the
synchSrc ).
• MUSYNCH signal on the MU_4I_4U function block monitors the synchronization flag from
the MU (in the datastream). When the MU indicates loss of time synchronization, this
signal is set.
A "blockedByTimeSynch" signal could be made by connecting the MUSYNCH and the SYNCH
through an OR gate. If also the SMPLLOST signal is connected to the same OR gate, it will be
more of a "BlockedByProblemsWith9-2" signal.
No synchronization
IEC 61850-9-2LE
IEC10000075 V1 EN-US
Figure 207: Setting example without time synchronization
It is possible to use IEC 61850-9-2LE communication without time synchronization. Settings in
this case under Settings/Time/Synchronization/TIMESYNCHGEN/IEC 61850-9-2 are:
Application manual
IED
Data
MU
IEC10000075-1-en.vsd
Section 18
Station communication
HW-
419