ABB RELION Series Technical Manual page 48

Section 2
REC615 and RER615 overview
42
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
devices, 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 V5 EN
Figure 10: Process bus application of voltage sharing and synchrocheck
REC615 and RER615 support 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 REC615 or RER615 protection relay to other devices with
phase voltage based functions and 9-2 support.
REC615 and RER615 protection relays 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.
Common Ethernet
1MRS758755 A
REC615 and RER615
Technical Manual