Process Bus - ABB RELION 620 Series Technical Manual

Protection and control

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and SAN to remove additional PRP information from the Ethernet frames. In some

cases, default PC workstation adapters are not able to handle the maximum-length

Ethernet frames with the PRP trailer.

There are different alternative ways to connect a laptop or a workstation as SAN to

a PRP network.

• Via an external redundancy box (RedBox) or a switch capable of connecting to

PRP and normal networks

• By connecting the node directly to LAN A or LAN B as SAN

• By connecting the node to the protection relay's interlink port

HSR applies the PRP principle of parallel operation to a single ring, treating the two

directions as two virtual LANs. For each frame sent, a node, DAN, sends two frames,

one over each port. Both frames circulate in opposite directions over the ring and

each node forwards the frames it receives, from one port to the other. When the

originating node receives a frame sent to itself, it discards that to avoid loops;

therefore, no ring protocol is needed. Individually attached nodes, SANs, such as

laptops and printers, must be attached through a "redundancy box" that acts as a

ring element. For example, a 615 or 620 series protection relay with HSR support can

be used as a redundancy box.

Figure 9: HSR solution

Process bus

Process bus IEC 61850-9-2 defines the transmission of Sampled Measured Values

within the substation automation system. International Users Group created a

guideline IEC 61850-9-2 LE that defines an application profile of IEC 61850-9-2

to facilitate implementation and enable interoperability. Process bus is used for

distributing process data from the primary circuit to all process bus compatible

devices in the local network in a real-time manner. The data can then be processed

Technical Manual

620 series overview