ABB Relion 670 Series Applications Manual page 469

1MRK 511 358-UUS A
protection functions.. This will happen max 4 seconds after an interruption of the PPS fiber
from the MU (or if the
• 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
IEC 61850-9-2LE
IEC10000074 V1 EN-US
Figure 219: Setting example with external synchronization
Settings in local HMI under Settings/Time/Synchronization/TIMESYNCHGEN/IEC 61850-9-2:
• 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:
Application manual
fineSyncSource is lost).
PPS / IRIG-B
IED
data
PPS
MU
STATION
CLOCK
IEC10000074-1-en.vsd
Section 18
Station communication
463