Merging Unit; Application; Setting Guidelines; Routes - Hitachi Relion 670 Series Applications Manual

Section 18
Ethernet-based communication
18.3

Merging unit

18.3.1

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.
IEC17000044 V1 EN-US
Figure 110:
18.3.2

Setting guidelines

For information on the merging unit setting guidelines, see section
communication
18.4

Routes

18.4.1 Application
Setting up a route enables communication to a device that is located in another subnetwork. Routing is
used when the destination device is not in the same subnetwork as the default gateway.
The route specifies that when a package is sent to the destination device it should be sent through the
selected router. If no route is specified the source device will not find the destination device.
272
Merging unit
protocol.
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IEC17000044-1-en.vsdx
1MRK511407-UUS Rev. N
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GUID-3449AB24-8C9D-4D9A-BD46-5DDF59A0F8E3 v1
IEC/UCA 61850-9-2LE
GUID-19616AC4-0FFD-4FF4-9198-5E33938E5ABD v1
Phasor measurement unit RES670
Application manual