Hitachi Relion 670 Series Applications Manual page 373
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1MRK506375-UEN Rev. N
SDM600
IEC18000011 V1 EN-US
Figure 185:
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.
Railway application RER670
Application manual
Maintenance Center
Network Control Center
Engineering
Computer HMI
Firewall
Workstation
VPN
AFS 6xx
AFS 6xx
SAM600
SAM600
Example of a station configuration with separated process bus and station bus
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Printer
Events Printer
WAMS
AFS 6xx
Gateway
AFS 6xx
SAM600
Section 18
Station communication
IEC 6185 0
FOX615
NSD570
ITT600
IET600
PCM600
IEC18000011-1-en.vsdx
367
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