Process Bus - ABB RELION REX640 Technical Manual

Protection and control

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1MRS759142 F

Figure 11: High-availability seamless redundancy solution

Interlink port

In the relay redundant COM module, the port without LAN-A/LAN-B tag is so called

interlink-port. This port can be used to connect a device directly to the relay. Mainly

this port should be used to connect a single point-to-point device, such as RIO600.

Although it is possible, it not recommended to connect big amount of devices

behind the interlink port, thus making the relay act as a hub between two network

segments. The relay should preferrably act as a network end-device, and not as a

hub for network traffic.

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

by any protection relay to perform different protection, automation and control

Redundant SMV streams are also supported by using the voltage (VMSWI) and

current (CMSWI) function blocks. Automatic switching to the backup SMV stream

can be configured in Application Configuration using SMV quality and/or other

UniGear Digital switchgear concept relies on the process bus together with current

and voltage sensors. The process bus enables several advantages for the UniGear

Digital like simplicity with reduced wiring, flexibility with data availability to all

devices, improved diagnostics and longer maintenance cycles.

With process bus the galvanic interpanel wiring for sharing busbar voltage value

can be replaced with Ethernet communication. Transmitting measurement samples

Technical Manual

Basic functions