Ethernet Redundancy - ABB RELION SMU615 Technical Manual

SMU615 overview
through these protocols. However, some communication functionality, for example,
horizontal communication between the merging units, is only enabled by the IEC
61850 communication protocol.
The IEC 61850 communication implementation supports all monitoring and control
functions. Additionally, parameter settings and disturbance recordings can be
accessed using the IEC 61850 protocol. Disturbance recordings are available to any
Ethernet-based application in the IEC 60255-24 standard COMTRADE file format.
The merging unit can send and receive binary signals from other devices (so-called
horizontal communication) using the IEC 61850-8-1 GOOSE profile, where the
highest performance class with a total transmission time of 3 ms is supported.
Furthermore, the merging unit supports sending of analog values using GOOSE
messaging. The merging unit meets the GOOSE performance requirements for
tripping applications in distribution substations, as defined by the IEC 61850
standard.
The merging unit can support five simultaneous clients. If PCM600 reserves one
client connection, only four connections are left for other clients.
All communication connectors, except for the front port connector, are placed on
integrated optional communication modules. The merging unit can be connected
to Ethernet-based communication systems via the RJ-45 connector (100Base-TX) or
the fiber-optic LC connector (100Base-FX).
2.5.1

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-1 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 time, thus fulfilling the stringent real-time
requirements for the substation automation horizontal communication and time
synchronization.
PRP specifies that each device is connected in parallel to two local area networks.
HSR applies the PRP principle to rings and to the rings of rings to achieve
cost-effective redundancy. Thus, each device incorporates a switch element that
forwards frames from port to port.
PRP
Each PRP node, called a doubly attached node with PRP (DAN), is attached to
two independent LANs operated in parallel. These parallel networks in PRP are
called LAN A and LAN B. The networks are completely separated to ensure failure
independence, and they can have different topologies. Both networks operate in
parallel, thus providing zero-time recovery and continuous checking of redundancy
to avoid communication failures. Non-PRP nodes, called single attached nodes
(SANs), are either attached to one network only (and can therefore communicate
only with DANs and SANs attached to the same network), or are attached through a
redundancy box, a device that behaves like a DAN.
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IEC 62439-3:2012 cancels and replaces the first edition published in 2010.
These standard versions are also referred to as IEC 62439-3 Edition 1 and
IEC 62439-3 Edition 2. The merging unit supports IEC 62439-3:2012 and it
is not compatible with IEC 62439-3:2010.
1MRS758407 C
SMU615
Technical Manual