ABB REB670 Series Applications Manual page 403

1MRK 505 370-UEN D
SDM600
IEC18000011 V1 EN-US
Figure 210: 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.
Busbar protection REB670
Application manual
Maintenance Center Network Control Center
Engineering Computer HMI
Firewall
Workstation
VPN
AFS 6xx
AFS 6xx
SAM600
SAM600
bus
Printer
Events Printer
WAMS
AFS 6xx
Gateway
AFS 6xx
SAM600
Section 17
Station communication
IEC 6185 0
FOX615
NSD570
ITT600
IET600 PCM600
IEC18000011-1-en.vsdx
397