ABB relion REF615 Applications Manual page 41

1MRS756378 S
REF615
Application Manual
UniGear Digital switchgear concept relies on the process bus together with current
and voltage sensors. The process bus enables several advantages for the UniGear
Digital like simplicity with reduced wiring, flexibility with data availability to all
IEDs, improved diagnostics and longer maintenance cycles.
With process bus the galvanic interpanel wiring for sharing busbar voltage value can
be replaced with Ethernet communication. Transmitting measurement samples over
process bus brings also higher error detection because the signal transmission is
automatically supervised. Additional contribution to the higher availability is the
possibility to use redundant Ethernet network for transmitting SMV signals.
Station bus (IEC 61850-8-1), process bus (IEC 61850-9-2 LE) and IEEE 1588 v2 time synchronization
GUID-2371EFA7-4369-4F1A-A23F-CF0CE2D474D3 V4 EN
Figure 9: Process bus application of voltage sharing and synchrocheck
The 615 series 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 from one 615 series IED to other IEDs with phase voltage based
functions and 9-2 support.
The 615 series IEDs 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.
REF615 overview
Common Ethernet
Section 2
35