Currents from
remote end 1
Currents to
remote end 1
Currents from
remote end 2
Currents to
remote end 2
LDCM 2
LDCM 1
Currents from
local CT
A/D
SMAI
Pre-processing
block
Line Differential
function
L3DPDIF
IEC05000533-2-en.vsd
IEC05000533-NEW V2 EN-US
Figure 16: Typical configuration of analog signals for a three-terminal line
Figure 16 shows how one IED in a three-terminal line differential protection can be configured. There
are two LDCMs each supporting a duplex connection with a remote line end. Thus, the same local
current is configured to both LDCMs, while the received currents from the LDCMs are configured
separately to the line differential protection function.
4.3.1 Configuration of analog inputs
GUID-3D04D47C-65FA-4C1F-BFC1-499BAAD506DA v1
Analog inputs are configured via PCM600.
1MRK505382-UEN Rev. K Section 4
Analog and binary signal transfer for line differential protection
Communication set-up, 670/650 series 23
Application Guide
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