by any protection relay to perform different protection, automation and control
functions.
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
GOOSE
SMV
GOOSE
Figure 10: Process bus application of voltage sharing and synchrocheck
The 620 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 620 series protection relay to other
devices with phase voltage based functions and 9-2 support.
The 620 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.
620 series overview
1MRS757644 H
48 620 series
Technical Manual
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