Setting example with two transformers in the protected zone (master-
slave differential operation)
IEC13000295-2-en.vsdx
A
B
C
T
B
T
A
IED
IED
IED
IEC13000295 V2 EN-US
Figure 40: Master- slave differential operation
Setting Station A Station B Station C
PDIF L3TCPDIF
NoOfUsedCTs 3
TraAOnInpCh 2
TraBOnInpCh 3
Protection functions in stations B and C operate as slaves (differential function switched off) so
currents are sent to protection function in station A, and received on channels 2 and 3. To inform the
differential algorithm that currents are coming from the LV sides of the transformers, TraAOnInpCh
must be set to 2 and TraBOnInpCh to 3 (channel1 is reserved for local measurement). This is to
ensure that proper turn ratio and vector group correction is done.
Setting example with a three-winding transformer in the protected zone
IEC13000296-1-en.vsdx
IED
IED
A
B
T
T
IEC13000296 V2 EN-US
Figure 41: Three-winding transformer in the zone
Section 4 1MRK505382-UEN Rev. K
Analog and binary signal transfer for line differential protection
40 Communication set-up, 670/650 series
Application Guide
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