Merging Unit - ABB REG670 Applications Manual

1MRK 502 071-UEN -
19.3
19.3.1
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
IEC16000039 V1 EN
Figure 320: ECT screen with Redundancy set to PRP-1 on Access point 1 and
HSR Access point 3

Merging unit

Application
The IEC/UCA 61850-9-2LE process bus communication protocol enables an IED to
communicate with devices providing measured values in digital format, commonly
known as Merging Units (MU). The rear access points are used for the
communication.
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.
Ethernet-based communication
IEC16000039-1-en.vsdx
Section 19
679