IEC10000070 V1 EN-US
Figure 22: Setting example with a redundant channel
Primary channel
Secondary redundant (reserve) channel
IEC07000229-1-en.vsdx
Telecommunication
network
Telecommunication
network
IEC07000229 V1 EN-US
Figure 23: Typical application with redundant channels (for two or three line
ends)
Redundant channels must be configured in the same way at both ends of the line
differential communication link or otherwise an unwanted trip may occur when the
main channel fails and the redundant channel is enabled. This means that it is not
possible to have an LDCM for a redundant channel only at one end.
Also, SMT configuration for the redundant channel must be left empty. The
redundant channel takes over the signal matrix configuration from the main
channel when enabled. If the redundant channel has been allocated, for example,
current inputs at one end or at both ends via the SMT tool, an unwanted trip occurs.
Section 4 1MRK 505 382-UEN B
Analog and binary signal transfer for line differential protection
34 Communication set-up 670/650 series 2.2
Application Guide
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