ABB Relion 670 Series Applications Manual page 553

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1MRK 511 401-UEN Rev. K

IEC18000011 V1 EN-US

Figure 264: Example of a station configuration with separated process bus and station

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.

Bay control REC670

Application manual

Maintenance Center

Network Control Center

Computer HMI

Events Printer

Station communication

IEC18000011-1-en.vsdx

Relion rec670