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 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. The HSR/PRP option is available for all 615
series protection relays. However, RED615 supports this option only over fiber
optics.
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 protection relay supports IEC 62439-3:2012
and it is not compatible with IEC 62439-3:2010.
PRP
Each PRP node, called a double 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.
Ethernet switch
IEC 61850 PRP
Ethernet switch
SCADA
COM600
Figure 8: PRP solution
In case a laptop or a PC workstation is connected as a non-PRP node to one of
the PRP networks, LAN A or LAN B, it is recommended to use a redundancy box
device or an Ethernet switch with similar functionality between the PRP network
620 series overview
1MRS757644 H
46 620 series
Technical Manual
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