Functions
2.2 Protection Data Interfaces and Protection Data Topology
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
77
Figure 2-11 Examples for communication connections
Note
The redundancy of different communication connections (for ring topology) requires a consistent separation of
the devices connected to the communication network. For example, different communication routes should not
be conducted via the same multiplexer card, as there is no alternative which could be used if the multiplexer
card fails.
Establishing the protection data communication
When the devices of a differential protection system are linked to each other and switched on, the devices com-
municate by themselves. The successful connection is indicated, e.g. with „Rel2 Login“, when device 1 has
detected device 2. Each device of a differential protection system informs each device of the successful pro-
tection data communication.
Additionally, the protection data interface is indicated via which a healthy link is established.
These are helpful features during commissioning and are described, together with further commissioning tools,
in the Section „Mounting and Commissioning“. But even during operation, the proper communication of the
devices can be checked.
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