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.
Protected zone
Communication Channel
IED
IED
IED
IED
ANSI05000043_2_en.vsd
IED
ANSI05000043 V2 EN
Figure 49:
Five terminal lines with master-master system
1MRK505222-UUS C
Section 5
Differential protection
125
Technical reference manual
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