ABB Relion 670 Series Technical Reference Manual page 131

1MRK505222-UUS C
Technical reference manual
communication channel is needed between every IED included in the same line
differential protection zone. In the latter, current samples are sent from all slave IEDs
to one master IED where the evaluation is made, and trip signals are sent to the remote
ends when needed. In this system, a 64 kbit/s communication channel is only needed
between the master, and each one of the slave IEDs.
It is recommended to use the same firmware version as well as
hardware version for a specific RED670 scheme.
IED
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ANSI05000043 V2 EN
Figure 49: Five terminal lines with master-master system
Protected zone
Communication Channel
IED IED
Section 5
Differential protection
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ANSI05000043_2_en.vsd
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