ABB RET670 Applications Manual page 833

1MRK504116-UUS C
Application manual
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
HW-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
IED
IEC 61850-9-2LE
Data
MU
IEC10000075-1-en.vsd
IEC10000075 V1 EN
Figure 321: 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:
• HwSyncSrc: set to Off
• AppSynch: set to NoSynch. This means that protection functions will not be blocked
• SyncAccLevel : set to unspecified
Settings in PST in PCM600 under: Hardware/Analog modules/Merging units/MU01
Section 4
Station communication
827