ABB RED650 - Merging Unit; Introduction

IEC16000038-1-en.vsdx
AP1
PhyPortB
PhyPortA
AP1
PhyPortA
PhyPortB
AP1
PhyPortA
PhyPortB
AP1
PhyPortB
PhyPortA
Device 1 Device 2
Device 3
Device 4
IEC16000038 V1 EN-US
Figure 314: HSR ring
17.4 Merging unit
17.4.1 Introduction
GUID-E630C16F-EDB8-40AE-A8A2-94189982D15F v1
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.
Section 17 1MRK 505 394-UEN A
Ethernet
630 Line differential protection RED650 2.2 IEC
Technical manual