17.20
SEL-400 Series Relays Instruction Manual Date Code 20171006
IEC 61850 Communication
Sampled Values
Figure 17.6 shows an independent bus mode network schematic with local IRIG
time source. In this schematic, the merging unit has settings BUSMODE :=
INDEPEND and NETPORT := A.
Figure 17.7 shows a merged bus mode network schematic with PTP time syn-
chronization. Process bus and station bus traffic are all processed in Port A. In
this schematic, the merging unit has settings BUSMODE := MERGED and
NETPORT := A.
GOOSE and SV Messaging
SEL-400 series SV products publish and subscribe GOOSE messages on both the
station bus and the process bus ports. GOOSE subscription error out of sequence
may be reported. For example, Figure 17.8 shows an SEL merging unit publish-
ing two GOOSE messages from the station bus and process bus. Without proper
GOOSE messages routing on the Ethernet switch, the SV relay receives GOOSE
Figure 17.5 Independent Bus Mode With PTP Time Synchronization on the
Station Bus
Figure 17.6 Independent Bus Mode With IRIG Time Synchronization
Figure 17.7 Merged Bus Mode With PTP Time Synchronization
Process Bus
Station Bus
SV RelaySV Relay
Merging Unit
Ethernet Switch
Ethernet Switch
SCADA
Merging Unit
A B C D A B C D
A B C D A B C D
PTP Time
Source
Process Bus
Station Bus
SV RelaySV Relay
Merging Unit
Ethernet Switch
Merging Unit
A B C D A B C D
A B C D A B C D
IRIG IRIG
IRIG IRIG
SCADA
Ethernet Switch
Process Bus and Station Bus
SV RelaySV Relay
Merging Unit
Ethernet Switch
SCADA
Merging Unit
A B C D A B C D
A B C D A B C D
PTP Time
Source
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