ABB RELION REX640 Technical Manual page 84

Basic functions
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.
Figure 12: Process bus application of voltage sharing and synchrocheck
REX640 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. One example application is sharing the measured busbar
voltage from one or several REX640 relays with the other REX640 relays. This can be
done even for a double busbar switchgear installation using automatic 9-2 stream
selection based on the bus disconnectors' physical position.
REX640 protection relays with process bus based applications use IEEE 1588 v2
Precision Time Protocol (PTP) according to IEEE C37.238-2011 or IEC 61850-9-3
profiles 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.
84
Station bus (IEC 61850-8-1), process bus (IEC 61850-9-2 LE) and IEEE 1588 v2 time synchronization
Common Ethernet
1MRS759142 F
REX640
Technical Manual