42 1VLG5 00007 E
3.4 Process bus (SMV)
Supported applications
Power measurement, directional protections, voltage based protections and synchro-check
work when voltage is shared over the Process bus.
640 series support redundant SMV streams by using the voltage (VMSWI) and current
(CMSWI) function blocks. Automatic switching to the backup SMV stream can be configured
in Application Configuration using SMV quality and/or other logic.
Figure 55: Example of Process bus application of voltage sharing and synchro-check
Figure 56: Example of Process bus application of voltage sharing redundancy and synchro
check
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