Section 4 Analog and binary signal transfer for line
differential protection
4.1 Communication channels for line differential
protection
M12022-69 v7
The line differential protection function uses 64 kbit/s or 2 Mbit/s communication
channels to exchange telegrams between the line differential protection IEDs.
These telegrams contain current sample values, time information, trip signals,
block signals, alarm signals and 8/192 binary signals, which can be used for any
purpose. Each IED can have a maximum of four communication channels.
On a two terminal line there is a need for one communication channel provided that
there is only one CT at each line end (see Figure
13).
IED
Protected zone
IEC05000437-2-en.vsdx
IED
IEC05000437 V2 EN-US
Figure 13: Two-terminal line
In case of 1½ breaker arrangements or ring buses, a line end has two CTs (see
Figure 14).
IE D
Protected zone
IED
IEC05000438-2-en.vsdx
IEC05000438 V2 EN-US
Figure 14: Two-terminal line with 1½ breaker
1MRK 505 382-UEN B Section 4
Analog and binary signal transfer for line differential protection
Communication set-up 670/650 series 2.2 27
Application Guide
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