ABB Relion REC670 - Page 424

• 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
IED
MU
data
PPS
IEC 61850-9-2LE
PPS / IRIG-B
STATION
CLOCK
IEC10000074-1-en.vsd
IEC10000074 V1 EN-US
Figure 206: Setting example with external synchronization
Settings in local HMI under Settings/Time/Synchronization/TIMESYNCHGEN/IEC 61850-9-2:
Section 18 1MRK 511 358-UEN A
Station communication
418
Application manual