ABB RELION 615 Series Product Manual page 18

Motor Protection and Control
REM615
Product version: 5.0 FP1
The relay also supports IEC 61850 process bus by sending
sampled values of analog currents and voltages and by
receiving sampled values of voltages. With this functionality the
galvanic interpanel wiring can be replaced with Ethernet
communication. The measured values are transferred as
sampled values using IEC 61850-9-2 LE protocol. The intended
application for sampled values shares the voltages to other 615
series relays, having voltage based functions and 9-2 support.
615 relays with process bus based applications use IEEE 1588
for high accuracy time synchronization.
For redundant Ethernet communication, the relay offers either
two optical or two galvanic Ethernet network interfaces. A third
port with galvanic Ethernet network interface is also available.
The third Ethernet interface provides connectivity for any other
Ethernet device to an IEC 61850 station bus inside a switchgear
bay, for example connection of a Remote I/O. Ethernet network
redundancy can be achieved using the high-availability
seamless redundancy (HSR) protocol or the parallel
redundancy protocol (PRP) or a with self-healing ring using
RSTP in managed switches. Ethernet redundancy can be
applied to Ethernet-based IEC 61850, Modbus and DNP3
protocols.
GUID-334D26B1-C3BD-47B6-BD9D-2301190A5E9D V2 EN
Figure 9. 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
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COM600
Ethernet switch
IEC 61850 PRP
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.
Ethernet switch
receives from one port to another to reach the next node. When
the originating sender node receives the frame it sent, the
sender node discards the frame to avoid loops. The HSR ring
with 615 series relays supports the connection of up to 30
1MRS756890 N
SCADA
ABB