Siemens 6MD85, Manual

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[dwintert-030211-02.tif, 1, en_US]
Figure 3-39 Data Exchange between 4 Devices with Protection Communications of Type 1 or Type 2 in a
Protection Topology
2-Device Topology: Simple or Redundant Transfer
In the case of a simple 2-device topology, one protection communication per device is required (see next
figure).
The most frequent application is the two-line-end differential protection (the protection communication is of
type 1) or the point-to-point exchange of data between 2 devices (the protection communication is of type 2),
as performed by protection transmission devices.
[dwinterf-030211-01.tif, 1, en_US]
Figure 3-40 Data Exchange for 2 Devices, Each Having Protection Communication
i
i
NOTE
The index describes the consecutive numbering of the devices in a protection topology (see parameter
Local device is device
).
A maximum of 2 protection communications can be integrated in one device (see next figure). If 2 protection
communications of the same type are connected to one another, this results in 100 % redundancy regarding
the transmission route. The devices then search for the communication connection with the highest band-
width (for example, optical fiber). If this connection fails, the system switches over automatically to the 2nd
connection until the 1st connection is available again. As the connection with lower bandwidth defines the
maximum amount of transferable information, the same information is exchanged via both connections. One
application of this is differential protection routed via a redundant communication connection. Both protec-
tion communications in the device are then of type 1.
System Functions
3.5 Protection Communication
SIPROTEC 5, High-Voltage Bay Controller, Manual 99
C53000-G5040-C015-9, Edition 11.2017