V01010
Switch 1 Switch 2
IED 1 IED 2
Switch 1 Switch 2
IED 1 IED 2
Star connection with redundant ports
managed by RSTP blocking function .
Ring connection managed by RST P
blocking function on upper switches
and IEDs interconnected directly .
Figure 60: IED attached to redundant Ethernet star or ring circuit
The RSTP solution is based on open standards. It is therefore compatible with other Manufacturers’ IEDs
that use the RSTP protocol. The RSTP recovery time is typically 300
ms but it increases with network size,
therefore cannot achieve the desired bumpless redundancy.
4.3 SELF-HEALING PROTOCOL (SHP)
Unlike RSTP, the Alstom Grid SHP solution responds to the constraints of critical time applications such as
the GOOSE messaging of IEC 61850. SHP in MiCOM Px4x is fully compatible with SHP used in the MiCOM
C264 and MiCOM H series of switches that are components of the PACiS Substation Automation System.
SHP is applied to double-ring network topologies. When a fibre is broken, both end stations detect the break.
Using both the primary and redundant networks the ring is automatically reclosed.
C264
Px4x
MiCOM
H35
C264
Px4x
Px4x
MiCOM
H35
E01011
Px4x
DS Agile Ethernet
IEC 61850 ring network
under normal conditions
DS Agile Ethernet
IEC 61850 ring network
self healed
Figure 61: IED, bay computer and Ethernet switch with self healing ring facilities
MiCOM P747 Chapter 8 - Redundant Ethernet
P747-TM-EN-1 247
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