ABB Relion 670 Series Commissioning Manual page 76

Section 8
Establishing connection and verifying the IEC 61850 communication
APStatusRedundant/RCHLCCH:1 and check that ChARedStatus and ChBRedStatus are shown
as Ok . Remove the optical connection to one of the Ethernet ports. Verify that either signal
status (depending on which connection that was removed) is shown as
other signal is shown as
verification.
70
Ok . Be sure to re-connect the removed connection after completed
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Transformer protection RET670
Commissioning manual