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.
Common Ethernet
Station bus (IEC 61850-8-1), process bus (IEC 61850-9-2 LE) and IEEE 1588 v2 time synchronization
GOOSE
SMV
GOOSE
SMV
SMV
GOOSE
GOOSE
SMV
GOOSE
SMV
SMV
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SMV
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GUID-2371EFA7-4369-4F1A-A23F-CF0CE2D474D3 V5 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 protection relay to other devices with phase
voltage based functions and 9-2 support.
The 615 series 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.
Section 2 1MRS758127 C
RED615 overview
28 RED615
Application Manual
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