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IEC18000011-1-en.vsdx
IEC18000011 V1 EN-US
Figure 210: Example of a station configuration with separated process bus and station
bus
The IED can get analog values simultaneously from a classical CT or VT and from a Merging
Unit, like in this example:
The merging units (MU) are called so because they can gather analog values from one or more
measuring transformers, sample the data and send the data over process bus to other clients
(or subscribers) in the system. Some merging units are able to get data from classical
measuring transformers, others from non-conventional measuring transducers and yet others
can pick up data from both types. The electronic part of a non-conventional measuring
transducer (like a Rogowski coil or a capacitive divider) can represent a MU by itself as long as
it can send sampled data over process bus.
1MRK 505 370-UEN D Section 17
Station communication
Busbar protection REB670 397
Application manual
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