ABB Relion 670 Series Application Manual page 45

1MRK 505 382-UEN E
Setting example with two transformers in the protected zone (master-
slave differential operation)
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IEC13000295 V2 EN-US
Figure 39: Master- slave differential operation
Setting
PDIF
NoOfUsedCTs
TraAOnInpCh
TraBOnInpCh
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,
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
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IEC13000296 V2 EN-US
Figure 40: Three-winding transformer in the zone
Communication set-up, 670/650 series
Application Guide
A
Station A
L3TCPDIF
3
2
3
TraAOnInpCh must be set to 2 and TraBOnInpCh to 3 (channel1 is reserved for
A
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Analog and binary signal transfer for line differential protection
T
A
T
B
Station B Station C
T
T
B
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C
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IEC13000295-2-en.vsdx
B
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IEC13000296-1-en.vsdx
Section 4
39