Siemens 6MD85, Manual

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Figure 3-41 Data Exchange for 2 Devices, Each Having 2 Protection Communications/Redundant Transmis-
sion Route
Multi-Device Topology: Ring or Chain Topology
When there are more than 2 devices, a communication chain or a communication ring can be established. An
arrangement with a maximum of 6 devices is possible.
To enable the devices in a topology to communicate with one another, the devices automatically detect the
type of topology and their position within this topology. All devices in the topology must contain protection
communications of the same type. In the case of devices with differential protection function 7SD and 7SL, a
protection communication of type 1 is automatically created. Multiple-end configurations are an order option.
In the case of other devices, a protection communication of type 2 is created, which can be present one or
2 times.
A distinction is made between the following types of topology:
•
Chain topology
•
Ring topology
The chain topology is shown in the following figure.
The protection communications must be of the same type to belong to a topology. All protection communica-
tions are of type 1 in a multiple-end differential-protection configuration.
The configuration shows that the indexing of the devices does not have to correspond to the order of the
communication chain.
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Figure 3-42 4 SIPROTEC Devices in a Chain Topology
The ring topology is shown in the following figure.
System Functions
3.5 Protection Communication
100 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017