Self Healing Protocol; Figure 196: Ied, Bay Computer And Ethernet Switch With Self Healing Ring Facilities; Figure 197: Redundant Ethernet Ring Architecture With Ied, Bay Computer And Ethernet Switches - GE MiCOM P40 Agile Technical Manual

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SELF HEALING PROTOCOL

The Self-Healing Protocol (SHP) implemented in the REB is a proprietary protocol that responds to the constraints

of critical time applications such as the GOOSE messaging of IEC 61850.

It is designed, primarily, to be used on PACiS Substation Automation Systems that employ the C264-SWR212

and/or H35x switches.

SHP is applied to double-ring network topologies. If adjacent devices detect a break in the ring, then they re-route

communication traffic to restore communication as outlined in the figure below.

A Self-Healing Management function (SHM) manages the ring.

Under healthy conditions, frames are sent on the main ring (primary fibre) in one direction, with short check frames

being sent every 5 μs in the opposite direction on the back-up ring (secondary fibre).

If the main ring breaks, the SHMs at either side of the break start the network self-healing. On one side of the

break, received messages are no longer sent to the main ring, but are sent to the back-up ring instead. On the

other side of the break, messages received on the back-up ring are sent to the main ring and communications are

re-established. This takes place in less than 1 ms and can be described as "bumpless".

The principle of SHP is outlined in the figures below.

P14xEd1-TM-EN-1

DS Agile Ethernet

IEC 61850 ring network

under normal conditions

Primary Fibre

Secondary Fibre

Chapter 18 - Communications

DS Agile Ethernet

IEC 61850 ring network

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