ABB Relion SMU615 Technical Manual page 35

1MRS758407 B
SMU615
Technical Manual
Substation
Merging Unit
with Binary I/0
Current Sensors
GUID-D8A746E4-6E21-4A4F-A963-7D66FE6A7255 V1 EN
Figure 9: Smart substation control and protection SSC600 with SMU615
The merging unit supports IEC 61850 process bus with sampled values of analog
currents and voltages. The measured values are transferred as sampled values using
the IEC 61850-9-2 LE protocol which uses the same physical Ethernet network as the
IEC 61850-8-1 station bus. The intended application for sampled values is sharing the
measured voltages and currents from the merging unit to other devices with 9-2
support.
The merging units with process bus based applications use IEEE 1588 v2 Precision
Time Protocol (PTP) according to IEEE C37.238-2011 Power Profile for high
accuracy time synchronization. With IEEE 1588 v2, the cabling infrastructure
requirement is reduced by allowing time synchronization information to be
transported over the same Ethernet network as the data communications.
SMU615 overview
Smart Substation
Control and Protection
SMV and GOOSE
Section 2
29