19
The IEC 61850 standard specifies network redundancy which
improves the system availability for the substation communi-
cation. The network redundancy is based on two complemen-
tary protocols defined in the IEC 62439-3 standard: PRP and
HSR protocols. Both the protocols are able to overcome a fail-
ure of a link or switch with a zero switch-over time. In both the
protocols, each network node has two identical Ethernet ports
dedicated for one network connection. The protocols rely on
the duplication of all transmitted information and provide a
zero switch-over time if the links or switches fail, thus fulfilling
all the stringent real-time requirements of substation
automation.
In PRP, each network node is attached to two independent net-
works operated in parallel. The networks are completely sepa-
rated to ensure failure independence and can have different
topologies. The networks operate in parallel, thus providing
zero-time recovery and continuous checking of redundancy to
avoid failures.
Ethernet switch
IEC 61850 PRP
Ethernet switch
SCADA
COM600
—
Figure 9. Parallel
redundancy proto-
col (PRP) solution
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