P54x/EN OP/La4 Operation
(OP) 5-120
MiCOM P543, P544, P545 & P546
OP
P1735ENc
Figure 78 Triangulated InterMiCOM64 application
If InterMiCOM
64
is working as standalone feature (i.e. Differential protection is disabled and
InterMiCOM
64
is enabled), a pass-through feature allows the scheme to remain in service in
case of one channel outage. It should be noted that in the case when one leg of the
communication triangle fails, i.e. channel A-C becomes unavailable, the InterMiCOM
64
will
continue to provide the full teleprotection scheme between all 3 ends. In this new ‘Chain’
topology, relays A and C will receive and transmit teleprotection commands via relay B,
which means that the original ‘Triangle’ topology is not necessary. The retransmitting done
by relay B (A-B-C and C-B-A) provides the self-healing for the lost links A-C and C-A).
Some users may apply Chain topology also as a means to save cost (two legs may be
cheaper to install than full triangulation).
2.3.1.1 Teleprotection communications address
The protectio
n communication messages include an address field to ensure correct scheme
connection. There are twenty one options for groups of addresses. The description of them
is exactly the same as per differential protection addresses described on section 2.1.16.
2.3.1.2 IMx fallback mode
In ca
se the received message is corrupted due to ether channel failure or lost
synchronization, the user can pre-define the status of each command individually as Latched
or Default. The new status will take effect after the ‘Channel Timeout’ user settable time has
elapsed. The “Default” mode allows a failsafe logic status to be applied.
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