same external switch or to two adjacent external switches. A self-healing Ethernet ring
requires a communication module with at least two Ethernet interfaces for all protection
relays.
GUID-AB81C355-EF5D-4658-8AE0-01DC076E519C-ANSI V1 EN
Figure 6: Self-healing Ethernet ring solution
The Ethernet ring solution supports the connection of up to 30 protection
relays. If more than 30 protection relays are to be connected, it is
recommended that the network is split into several rings with no more than
30 protection relays per ring. Each protection relay has a 50-μs store-and-
forward delay, and to fulfil the performance requirements for fast
horizontal communication, the ring size is limited to 30 protection relays.
2.7.2 Ethernet redundancy
IEC 61850 specifies a network redundancy scheme that improves the system availability
for substation communication. It is based on two complementary protocols defined in the
IEC 62439-3:2012 standard: parallel redundancy protocol PRP and high-availability
seamless redundancy HSR protocol. Both protocols rely on the duplication of all
transmitted information via two Ethernet ports for one logical network connection.
Therefore, both are able to overcome the failure of a link or switch with a zero-switchover
Section 2 1MAC109016-MB C
REF615 overview
28 REF615 ANSI
Application Manual
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