Parallel Redundancy Protocol (Prp) Solution - ABB RET620 Product Manual

Transformer Protection and Control
RET620
Product version: 2.0
(Generic Object Oriented Substation Event) profile. Binary
GOOSE messaging can, for example, be employed for
protection and interlocking-based protection schemes. The
IED meets the GOOSE performance requirements for tripping
applications in distribution substations, as defined by the IEC
61850 standard. The IED also supports the sending and
receiving of analog values using GOOSE messaging. Analog
GOOSE messaging enables fast transfer of analog
measurement values over the station bus, thus facilitating for
example sharing of RTD input values, such as surrounding
temperature values, to other IED applications.
For redundant Ethernet solution, the IED offers a fibre-optic
communication module providing two optical and one
galvanic Ethernet network interfaces. Alternatively, the IED
features a galvanic communication module with two galvanic
and one optical Ethernet network interfaces or three galvanic
interfaces. The third Ethernet interface provides connectivity
for any other Ethernet devices to an IEC 61850 station bus
inside in a switchgear bay. The redundant solution can be
applied to the Ethernet-based IEC 61850, Modbus and DNP3
protocols.
Ethernet network redundancy can be achieved using the high-
availability seamless redundancy (HSR) protocol or the
REF615 REF620
GUID-334D26B1-C3BD-47B6-BD9D-2301190A5E9D V1 EN
Figure 5.

Parallel redundancy protocol (PRP) solution

HSR applies the PRP principle of parallel operation to a single
ring. For each message sent, the node sends two frames,
one through each port. Both the frames circulate in opposite
directions over the ring. Every node forwards the frames it
receives from one port to another to reach the next node.
When the originating sender node receives the frame it sent,
ABB
COM600
Ethernet switch
IEC 61850 PRP
RET620
parallel redundancy protocol (PRP) or a with self-healing ring
using RSTP in managed switches. Ethernet redundancy can
be applied to all Ethernet-based IEC 61850, Modbus and
DNP3 protocols.
The IEC 61850 standard specifies network redundancy which
improves the system availability for the substation
communication. The network redundancy is based on two
complementary protocols defined in the IEC 62439-3
standard: PRP and HSR protocols. Both the protocols are
able to overcome a failure 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
networks operated in parallel. The networks are completely
separated 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.
SCADA
Ethernet switch
REM620
the sender node discards the frame to avoid loops. The HSR
ring with 620 series IEDs supports the connection of up to
thirty IEDs. If more than 30 IEDs are to be connected, it is
recommended to split the network into several rings to
guarantee the performance for real-time applications.
1MRS757846 A
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