RTUs (Remote Terminal Units - German: Fernwirkgerät) are applied in many domains like power transmission and distribution. These RTUs meet the requirements of the past - but the future needs are far beyond the functions currently implemented.
One crucial future requirement is the communication between intelligent electronic devices (IED). A distribution automation device could communicate with many neighboring IEDs (peer-to-peer communication) and figure out autonomously what's going on in the distribution network ... and make decisions without a central SCADA system!
IEC 61850 has all the communication services to support the intelligent IEDs in the distribution network.
A paper from SEL shows an example how to use GOOSE messaging for peer-to-peer communication in distribution automation.
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