ABB ProtectIT REL 551 2.5 Installation And Commissioning Manual page 81

Differential protection terminal
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Fault tracing
Chapter 8
Configuring the 56/64 kbit data
communication modules
surements presented on the front HMI are not connected to COMFAIL or by in-
dications of channel delay exceeding 12 ms, since the delay is not a channel
interrupt, the channel is still working.
72

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