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IEC18000011-1-en.vsdx

IEC18000011 V1 EN-US

Figure 150: 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.

Section 18 1MRK 505 393-UEN B

Station communication

366 Line differential protection RED650 2.2 IEC

Application manual

ABB RED650 Applications Manual

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